os_solaris.cpp revision 4456:8be1318fbe77
1/* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25// no precompiled headers 26#include "classfile/classLoader.hpp" 27#include "classfile/systemDictionary.hpp" 28#include "classfile/vmSymbols.hpp" 29#include "code/icBuffer.hpp" 30#include "code/vtableStubs.hpp" 31#include "compiler/compileBroker.hpp" 32#include "compiler/disassembler.hpp" 33#include "interpreter/interpreter.hpp" 34#include "jvm_solaris.h" 35#include "memory/allocation.inline.hpp" 36#include "memory/filemap.hpp" 37#include "mutex_solaris.inline.hpp" 38#include "oops/oop.inline.hpp" 39#include "os_share_solaris.hpp" 40#include "prims/jniFastGetField.hpp" 41#include "prims/jvm.h" 42#include "prims/jvm_misc.hpp" 43#include "runtime/arguments.hpp" 44#include "runtime/extendedPC.hpp" 45#include "runtime/globals.hpp" 46#include "runtime/interfaceSupport.hpp" 47#include "runtime/java.hpp" 48#include "runtime/javaCalls.hpp" 49#include "runtime/mutexLocker.hpp" 50#include "runtime/objectMonitor.hpp" 51#include "runtime/osThread.hpp" 52#include "runtime/perfMemory.hpp" 53#include "runtime/sharedRuntime.hpp" 54#include "runtime/statSampler.hpp" 55#include "runtime/stubRoutines.hpp" 56#include "runtime/thread.inline.hpp" 57#include "runtime/threadCritical.hpp" 58#include "runtime/timer.hpp" 59#include "services/attachListener.hpp" 60#include "services/memTracker.hpp" 61#include "services/runtimeService.hpp" 62#include "utilities/decoder.hpp" 63#include "utilities/defaultStream.hpp" 64#include "utilities/events.hpp" 65#include "utilities/growableArray.hpp" 66#include "utilities/vmError.hpp" 67 68// put OS-includes here 69# include <dlfcn.h> 70# include <errno.h> 71# include <exception> 72# include <link.h> 73# include <poll.h> 74# include <pthread.h> 75# include <pwd.h> 76# include <schedctl.h> 77# include <setjmp.h> 78# include <signal.h> 79# include <stdio.h> 80# include <alloca.h> 81# include <sys/filio.h> 82# include <sys/ipc.h> 83# include <sys/lwp.h> 84# include <sys/machelf.h> // for elf Sym structure used by dladdr1 85# include <sys/mman.h> 86# include <sys/processor.h> 87# include <sys/procset.h> 88# include <sys/pset.h> 89# include <sys/resource.h> 90# include <sys/shm.h> 91# include <sys/socket.h> 92# include <sys/stat.h> 93# include <sys/systeminfo.h> 94# include <sys/time.h> 95# include <sys/times.h> 96# include <sys/types.h> 97# include <sys/wait.h> 98# include <sys/utsname.h> 99# include <thread.h> 100# include <unistd.h> 101# include <sys/priocntl.h> 102# include <sys/rtpriocntl.h> 103# include <sys/tspriocntl.h> 104# include <sys/iapriocntl.h> 105# include <sys/fxpriocntl.h> 106# include <sys/loadavg.h> 107# include <string.h> 108# include <stdio.h> 109 110# define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later 111# include <sys/procfs.h> // see comment in <sys/procfs.h> 112 113#define MAX_PATH (2 * K) 114 115// for timer info max values which include all bits 116#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 117 118#ifdef _GNU_SOURCE 119// See bug #6514594 120extern "C" int madvise(caddr_t, size_t, int); 121extern "C" int memcntl(caddr_t addr, size_t len, int cmd, caddr_t arg, 122 int attr, int mask); 123#endif //_GNU_SOURCE 124 125/* 126 MPSS Changes Start. 127 The JVM binary needs to be built and run on pre-Solaris 9 128 systems, but the constants needed by MPSS are only in Solaris 9 129 header files. They are textually replicated here to allow 130 building on earlier systems. Once building on Solaris 8 is 131 no longer a requirement, these #defines can be replaced by ordinary 132 system .h inclusion. 133 134 In earlier versions of the JDK and Solaris, we used ISM for large pages. 135 But ISM requires shared memory to achieve this and thus has many caveats. 136 MPSS is a fully transparent and is a cleaner way to get large pages. 137 Although we still require keeping ISM for backward compatiblitiy as well as 138 giving the opportunity to use large pages on older systems it is 139 recommended that MPSS be used for Solaris 9 and above. 140 141*/ 142 143#ifndef MC_HAT_ADVISE 144 145struct memcntl_mha { 146 uint_t mha_cmd; /* command(s) */ 147 uint_t mha_flags; 148 size_t mha_pagesize; 149}; 150#define MC_HAT_ADVISE 7 /* advise hat map size */ 151#define MHA_MAPSIZE_VA 0x1 /* set preferred page size */ 152#define MAP_ALIGN 0x200 /* addr specifies alignment */ 153 154#endif 155// MPSS Changes End. 156 157 158// Here are some liblgrp types from sys/lgrp_user.h to be able to 159// compile on older systems without this header file. 160 161#ifndef MADV_ACCESS_LWP 162# define MADV_ACCESS_LWP 7 /* next LWP to access heavily */ 163#endif 164#ifndef MADV_ACCESS_MANY 165# define MADV_ACCESS_MANY 8 /* many processes to access heavily */ 166#endif 167 168#ifndef LGRP_RSRC_CPU 169# define LGRP_RSRC_CPU 0 /* CPU resources */ 170#endif 171#ifndef LGRP_RSRC_MEM 172# define LGRP_RSRC_MEM 1 /* memory resources */ 173#endif 174 175// Some more macros from sys/mman.h that are not present in Solaris 8. 176 177#ifndef MAX_MEMINFO_CNT 178/* 179 * info_req request type definitions for meminfo 180 * request types starting with MEMINFO_V are used for Virtual addresses 181 * and should not be mixed with MEMINFO_PLGRP which is targeted for Physical 182 * addresses 183 */ 184# define MEMINFO_SHIFT 16 185# define MEMINFO_MASK (0xFF << MEMINFO_SHIFT) 186# define MEMINFO_VPHYSICAL (0x01 << MEMINFO_SHIFT) /* get physical addr */ 187# define MEMINFO_VLGRP (0x02 << MEMINFO_SHIFT) /* get lgroup */ 188# define MEMINFO_VPAGESIZE (0x03 << MEMINFO_SHIFT) /* size of phys page */ 189# define MEMINFO_VREPLCNT (0x04 << MEMINFO_SHIFT) /* no. of replica */ 190# define MEMINFO_VREPL (0x05 << MEMINFO_SHIFT) /* physical replica */ 191# define MEMINFO_VREPL_LGRP (0x06 << MEMINFO_SHIFT) /* lgrp of replica */ 192# define MEMINFO_PLGRP (0x07 << MEMINFO_SHIFT) /* lgroup for paddr */ 193 194/* maximum number of addresses meminfo() can process at a time */ 195# define MAX_MEMINFO_CNT 256 196 197/* maximum number of request types */ 198# define MAX_MEMINFO_REQ 31 199#endif 200 201// see thr_setprio(3T) for the basis of these numbers 202#define MinimumPriority 0 203#define NormalPriority 64 204#define MaximumPriority 127 205 206// Values for ThreadPriorityPolicy == 1 207int prio_policy1[CriticalPriority+1] = { 208 -99999, 0, 16, 32, 48, 64, 209 80, 96, 112, 124, 127, 127 }; 210 211// System parameters used internally 212static clock_t clock_tics_per_sec = 100; 213 214// Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+) 215static bool enabled_extended_FILE_stdio = false; 216 217// For diagnostics to print a message once. see run_periodic_checks 218static bool check_addr0_done = false; 219static sigset_t check_signal_done; 220static bool check_signals = true; 221 222address os::Solaris::handler_start; // start pc of thr_sighndlrinfo 223address os::Solaris::handler_end; // end pc of thr_sighndlrinfo 224 225address os::Solaris::_main_stack_base = NULL; // 4352906 workaround 226 227 228// "default" initializers for missing libc APIs 229extern "C" { 230 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 231 static int lwp_mutex_destroy(mutex_t *mx) { return 0; } 232 233 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 234 static int lwp_cond_destroy(cond_t *cv) { return 0; } 235} 236 237// "default" initializers for pthread-based synchronization 238extern "C" { 239 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 240 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 241} 242 243// Thread Local Storage 244// This is common to all Solaris platforms so it is defined here, 245// in this common file. 246// The declarations are in the os_cpu threadLS*.hpp files. 247// 248// Static member initialization for TLS 249Thread* ThreadLocalStorage::_get_thread_cache[ThreadLocalStorage::_pd_cache_size] = {NULL}; 250 251#ifndef PRODUCT 252#define _PCT(n,d) ((100.0*(double)(n))/(double)(d)) 253 254int ThreadLocalStorage::_tcacheHit = 0; 255int ThreadLocalStorage::_tcacheMiss = 0; 256 257void ThreadLocalStorage::print_statistics() { 258 int total = _tcacheMiss+_tcacheHit; 259 tty->print_cr("Thread cache hits %d misses %d total %d percent %f\n", 260 _tcacheHit, _tcacheMiss, total, _PCT(_tcacheHit, total)); 261} 262#undef _PCT 263#endif // PRODUCT 264 265Thread* ThreadLocalStorage::get_thread_via_cache_slowly(uintptr_t raw_id, 266 int index) { 267 Thread *thread = get_thread_slow(); 268 if (thread != NULL) { 269 address sp = os::current_stack_pointer(); 270 guarantee(thread->_stack_base == NULL || 271 (sp <= thread->_stack_base && 272 sp >= thread->_stack_base - thread->_stack_size) || 273 is_error_reported(), 274 "sp must be inside of selected thread stack"); 275 276 thread->set_self_raw_id(raw_id); // mark for quick retrieval 277 _get_thread_cache[ index ] = thread; 278 } 279 return thread; 280} 281 282 283static const double all_zero[ sizeof(Thread) / sizeof(double) + 1 ] = {0}; 284#define NO_CACHED_THREAD ((Thread*)all_zero) 285 286void ThreadLocalStorage::pd_set_thread(Thread* thread) { 287 288 // Store the new value before updating the cache to prevent a race 289 // between get_thread_via_cache_slowly() and this store operation. 290 os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread); 291 292 // Update thread cache with new thread if setting on thread create, 293 // or NO_CACHED_THREAD (zeroed) thread if resetting thread on exit. 294 uintptr_t raw = pd_raw_thread_id(); 295 int ix = pd_cache_index(raw); 296 _get_thread_cache[ix] = thread == NULL ? NO_CACHED_THREAD : thread; 297} 298 299void ThreadLocalStorage::pd_init() { 300 for (int i = 0; i < _pd_cache_size; i++) { 301 _get_thread_cache[i] = NO_CACHED_THREAD; 302 } 303} 304 305// Invalidate all the caches (happens to be the same as pd_init). 306void ThreadLocalStorage::pd_invalidate_all() { pd_init(); } 307 308#undef NO_CACHED_THREAD 309 310// END Thread Local Storage 311 312static inline size_t adjust_stack_size(address base, size_t size) { 313 if ((ssize_t)size < 0) { 314 // 4759953: Compensate for ridiculous stack size. 315 size = max_intx; 316 } 317 if (size > (size_t)base) { 318 // 4812466: Make sure size doesn't allow the stack to wrap the address space. 319 size = (size_t)base; 320 } 321 return size; 322} 323 324static inline stack_t get_stack_info() { 325 stack_t st; 326 int retval = thr_stksegment(&st); 327 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size); 328 assert(retval == 0, "incorrect return value from thr_stksegment"); 329 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 330 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 331 return st; 332} 333 334address os::current_stack_base() { 335 int r = thr_main() ; 336 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ; 337 bool is_primordial_thread = r; 338 339 // Workaround 4352906, avoid calls to thr_stksegment by 340 // thr_main after the first one (it looks like we trash 341 // some data, causing the value for ss_sp to be incorrect). 342 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) { 343 stack_t st = get_stack_info(); 344 if (is_primordial_thread) { 345 // cache initial value of stack base 346 os::Solaris::_main_stack_base = (address)st.ss_sp; 347 } 348 return (address)st.ss_sp; 349 } else { 350 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base"); 351 return os::Solaris::_main_stack_base; 352 } 353} 354 355size_t os::current_stack_size() { 356 size_t size; 357 358 int r = thr_main() ; 359 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ; 360 if(!r) { 361 size = get_stack_info().ss_size; 362 } else { 363 struct rlimit limits; 364 getrlimit(RLIMIT_STACK, &limits); 365 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur); 366 } 367 // base may not be page aligned 368 address base = current_stack_base(); 369 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());; 370 return (size_t)(base - bottom); 371} 372 373struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 374 return localtime_r(clock, res); 375} 376 377// interruptible infrastructure 378 379// setup_interruptible saves the thread state before going into an 380// interruptible system call. 381// The saved state is used to restore the thread to 382// its former state whether or not an interrupt is received. 383// Used by classloader os::read 384// os::restartable_read calls skip this layer and stay in _thread_in_native 385 386void os::Solaris::setup_interruptible(JavaThread* thread) { 387 388 JavaThreadState thread_state = thread->thread_state(); 389 390 assert(thread_state != _thread_blocked, "Coming from the wrong thread"); 391 assert(thread_state != _thread_in_native, "Native threads skip setup_interruptible"); 392 OSThread* osthread = thread->osthread(); 393 osthread->set_saved_interrupt_thread_state(thread_state); 394 thread->frame_anchor()->make_walkable(thread); 395 ThreadStateTransition::transition(thread, thread_state, _thread_blocked); 396} 397 398// Version of setup_interruptible() for threads that are already in 399// _thread_blocked. Used by os_sleep(). 400void os::Solaris::setup_interruptible_already_blocked(JavaThread* thread) { 401 thread->frame_anchor()->make_walkable(thread); 402} 403 404JavaThread* os::Solaris::setup_interruptible() { 405 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread(); 406 setup_interruptible(thread); 407 return thread; 408} 409 410void os::Solaris::try_enable_extended_io() { 411 typedef int (*enable_extended_FILE_stdio_t)(int, int); 412 413 if (!UseExtendedFileIO) { 414 return; 415 } 416 417 enable_extended_FILE_stdio_t enabler = 418 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT, 419 "enable_extended_FILE_stdio"); 420 if (enabler) { 421 enabler(-1, -1); 422 } 423} 424 425 426#ifdef ASSERT 427 428JavaThread* os::Solaris::setup_interruptible_native() { 429 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread(); 430 JavaThreadState thread_state = thread->thread_state(); 431 assert(thread_state == _thread_in_native, "Assumed thread_in_native"); 432 return thread; 433} 434 435void os::Solaris::cleanup_interruptible_native(JavaThread* thread) { 436 JavaThreadState thread_state = thread->thread_state(); 437 assert(thread_state == _thread_in_native, "Assumed thread_in_native"); 438} 439#endif 440 441// cleanup_interruptible reverses the effects of setup_interruptible 442// setup_interruptible_already_blocked() does not need any cleanup. 443 444void os::Solaris::cleanup_interruptible(JavaThread* thread) { 445 OSThread* osthread = thread->osthread(); 446 447 ThreadStateTransition::transition(thread, _thread_blocked, osthread->saved_interrupt_thread_state()); 448} 449 450// I/O interruption related counters called in _INTERRUPTIBLE 451 452void os::Solaris::bump_interrupted_before_count() { 453 RuntimeService::record_interrupted_before_count(); 454} 455 456void os::Solaris::bump_interrupted_during_count() { 457 RuntimeService::record_interrupted_during_count(); 458} 459 460static int _processors_online = 0; 461 462 jint os::Solaris::_os_thread_limit = 0; 463volatile jint os::Solaris::_os_thread_count = 0; 464 465julong os::available_memory() { 466 return Solaris::available_memory(); 467} 468 469julong os::Solaris::available_memory() { 470 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size(); 471} 472 473julong os::Solaris::_physical_memory = 0; 474 475julong os::physical_memory() { 476 return Solaris::physical_memory(); 477} 478 479static hrtime_t first_hrtime = 0; 480static const hrtime_t hrtime_hz = 1000*1000*1000; 481const int LOCK_BUSY = 1; 482const int LOCK_FREE = 0; 483const int LOCK_INVALID = -1; 484static volatile hrtime_t max_hrtime = 0; 485static volatile int max_hrtime_lock = LOCK_FREE; // Update counter with LSB as lock-in-progress 486 487 488void os::Solaris::initialize_system_info() { 489 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); 490 _processors_online = sysconf (_SC_NPROCESSORS_ONLN); 491 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE); 492} 493 494int os::active_processor_count() { 495 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 496 pid_t pid = getpid(); 497 psetid_t pset = PS_NONE; 498 // Are we running in a processor set or is there any processor set around? 499 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) { 500 uint_t pset_cpus; 501 // Query the number of cpus available to us. 502 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) { 503 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check"); 504 _processors_online = pset_cpus; 505 return pset_cpus; 506 } 507 } 508 // Otherwise return number of online cpus 509 return online_cpus; 510} 511 512static bool find_processors_in_pset(psetid_t pset, 513 processorid_t** id_array, 514 uint_t* id_length) { 515 bool result = false; 516 // Find the number of processors in the processor set. 517 if (pset_info(pset, NULL, id_length, NULL) == 0) { 518 // Make up an array to hold their ids. 519 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 520 // Fill in the array with their processor ids. 521 if (pset_info(pset, NULL, id_length, *id_array) == 0) { 522 result = true; 523 } 524 } 525 return result; 526} 527 528// Callers of find_processors_online() must tolerate imprecise results -- 529// the system configuration can change asynchronously because of DR 530// or explicit psradm operations. 531// 532// We also need to take care that the loop (below) terminates as the 533// number of processors online can change between the _SC_NPROCESSORS_ONLN 534// request and the loop that builds the list of processor ids. Unfortunately 535// there's no reliable way to determine the maximum valid processor id, 536// so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online 537// man pages, which claim the processor id set is "sparse, but 538// not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually 539// exit the loop. 540// 541// In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's 542// not available on S8.0. 543 544static bool find_processors_online(processorid_t** id_array, 545 uint* id_length) { 546 const processorid_t MAX_PROCESSOR_ID = 100000 ; 547 // Find the number of processors online. 548 *id_length = sysconf(_SC_NPROCESSORS_ONLN); 549 // Make up an array to hold their ids. 550 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 551 // Processors need not be numbered consecutively. 552 long found = 0; 553 processorid_t next = 0; 554 while (found < *id_length && next < MAX_PROCESSOR_ID) { 555 processor_info_t info; 556 if (processor_info(next, &info) == 0) { 557 // NB, PI_NOINTR processors are effectively online ... 558 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) { 559 (*id_array)[found] = next; 560 found += 1; 561 } 562 } 563 next += 1; 564 } 565 if (found < *id_length) { 566 // The loop above didn't identify the expected number of processors. 567 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN) 568 // and re-running the loop, above, but there's no guarantee of progress 569 // if the system configuration is in flux. Instead, we just return what 570 // we've got. Note that in the worst case find_processors_online() could 571 // return an empty set. (As a fall-back in the case of the empty set we 572 // could just return the ID of the current processor). 573 *id_length = found ; 574 } 575 576 return true; 577} 578 579static bool assign_distribution(processorid_t* id_array, 580 uint id_length, 581 uint* distribution, 582 uint distribution_length) { 583 // We assume we can assign processorid_t's to uint's. 584 assert(sizeof(processorid_t) == sizeof(uint), 585 "can't convert processorid_t to uint"); 586 // Quick check to see if we won't succeed. 587 if (id_length < distribution_length) { 588 return false; 589 } 590 // Assign processor ids to the distribution. 591 // Try to shuffle processors to distribute work across boards, 592 // assuming 4 processors per board. 593 const uint processors_per_board = ProcessDistributionStride; 594 // Find the maximum processor id. 595 processorid_t max_id = 0; 596 for (uint m = 0; m < id_length; m += 1) { 597 max_id = MAX2(max_id, id_array[m]); 598 } 599 // The next id, to limit loops. 600 const processorid_t limit_id = max_id + 1; 601 // Make up markers for available processors. 602 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal); 603 for (uint c = 0; c < limit_id; c += 1) { 604 available_id[c] = false; 605 } 606 for (uint a = 0; a < id_length; a += 1) { 607 available_id[id_array[a]] = true; 608 } 609 // Step by "boards", then by "slot", copying to "assigned". 610 // NEEDS_CLEANUP: The assignment of processors should be stateful, 611 // remembering which processors have been assigned by 612 // previous calls, etc., so as to distribute several 613 // independent calls of this method. What we'd like is 614 // It would be nice to have an API that let us ask 615 // how many processes are bound to a processor, 616 // but we don't have that, either. 617 // In the short term, "board" is static so that 618 // subsequent distributions don't all start at board 0. 619 static uint board = 0; 620 uint assigned = 0; 621 // Until we've found enough processors .... 622 while (assigned < distribution_length) { 623 // ... find the next available processor in the board. 624 for (uint slot = 0; slot < processors_per_board; slot += 1) { 625 uint try_id = board * processors_per_board + slot; 626 if ((try_id < limit_id) && (available_id[try_id] == true)) { 627 distribution[assigned] = try_id; 628 available_id[try_id] = false; 629 assigned += 1; 630 break; 631 } 632 } 633 board += 1; 634 if (board * processors_per_board + 0 >= limit_id) { 635 board = 0; 636 } 637 } 638 if (available_id != NULL) { 639 FREE_C_HEAP_ARRAY(bool, available_id, mtInternal); 640 } 641 return true; 642} 643 644void os::set_native_thread_name(const char *name) { 645 // Not yet implemented. 646 return; 647} 648 649bool os::distribute_processes(uint length, uint* distribution) { 650 bool result = false; 651 // Find the processor id's of all the available CPUs. 652 processorid_t* id_array = NULL; 653 uint id_length = 0; 654 // There are some races between querying information and using it, 655 // since processor sets can change dynamically. 656 psetid_t pset = PS_NONE; 657 // Are we running in a processor set? 658 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) { 659 result = find_processors_in_pset(pset, &id_array, &id_length); 660 } else { 661 result = find_processors_online(&id_array, &id_length); 662 } 663 if (result == true) { 664 if (id_length >= length) { 665 result = assign_distribution(id_array, id_length, distribution, length); 666 } else { 667 result = false; 668 } 669 } 670 if (id_array != NULL) { 671 FREE_C_HEAP_ARRAY(processorid_t, id_array, mtInternal); 672 } 673 return result; 674} 675 676bool os::bind_to_processor(uint processor_id) { 677 // We assume that a processorid_t can be stored in a uint. 678 assert(sizeof(uint) == sizeof(processorid_t), 679 "can't convert uint to processorid_t"); 680 int bind_result = 681 processor_bind(P_LWPID, // bind LWP. 682 P_MYID, // bind current LWP. 683 (processorid_t) processor_id, // id. 684 NULL); // don't return old binding. 685 return (bind_result == 0); 686} 687 688bool os::getenv(const char* name, char* buffer, int len) { 689 char* val = ::getenv( name ); 690 if ( val == NULL 691 || strlen(val) + 1 > len ) { 692 if (len > 0) buffer[0] = 0; // return a null string 693 return false; 694 } 695 strcpy( buffer, val ); 696 return true; 697} 698 699 700// Return true if user is running as root. 701 702bool os::have_special_privileges() { 703 static bool init = false; 704 static bool privileges = false; 705 if (!init) { 706 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 707 init = true; 708 } 709 return privileges; 710} 711 712 713void os::init_system_properties_values() { 714 char arch[12]; 715 sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); 716 717 // The next steps are taken in the product version: 718 // 719 // Obtain the JAVA_HOME value from the location of libjvm.so. 720 // This library should be located at: 721 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 722 // 723 // If "/jre/lib/" appears at the right place in the path, then we 724 // assume libjvm.so is installed in a JDK and we use this path. 725 // 726 // Otherwise exit with message: "Could not create the Java virtual machine." 727 // 728 // The following extra steps are taken in the debugging version: 729 // 730 // If "/jre/lib/" does NOT appear at the right place in the path 731 // instead of exit check for $JAVA_HOME environment variable. 732 // 733 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 734 // then we append a fake suffix "hotspot/libjvm.so" to this path so 735 // it looks like libjvm.so is installed there 736 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 737 // 738 // Otherwise exit. 739 // 740 // Important note: if the location of libjvm.so changes this 741 // code needs to be changed accordingly. 742 743 // The next few definitions allow the code to be verbatim: 744#define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) 745#define free(p) FREE_C_HEAP_ARRAY(char, p, mtInternal) 746#define getenv(n) ::getenv(n) 747 748#define EXTENSIONS_DIR "/lib/ext" 749#define ENDORSED_DIR "/lib/endorsed" 750#define COMMON_DIR "/usr/jdk/packages" 751 752 { 753 /* sysclasspath, java_home, dll_dir */ 754 { 755 char *home_path; 756 char *dll_path; 757 char *pslash; 758 char buf[MAXPATHLEN]; 759 os::jvm_path(buf, sizeof(buf)); 760 761 // Found the full path to libjvm.so. 762 // Now cut the path to <java_home>/jre if we can. 763 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ 764 pslash = strrchr(buf, '/'); 765 if (pslash != NULL) 766 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ 767 dll_path = malloc(strlen(buf) + 1); 768 if (dll_path == NULL) 769 return; 770 strcpy(dll_path, buf); 771 Arguments::set_dll_dir(dll_path); 772 773 if (pslash != NULL) { 774 pslash = strrchr(buf, '/'); 775 if (pslash != NULL) { 776 *pslash = '\0'; /* get rid of /<arch> */ 777 pslash = strrchr(buf, '/'); 778 if (pslash != NULL) 779 *pslash = '\0'; /* get rid of /lib */ 780 } 781 } 782 783 home_path = malloc(strlen(buf) + 1); 784 if (home_path == NULL) 785 return; 786 strcpy(home_path, buf); 787 Arguments::set_java_home(home_path); 788 789 if (!set_boot_path('/', ':')) 790 return; 791 } 792 793 /* 794 * Where to look for native libraries 795 */ 796 { 797 // Use dlinfo() to determine the correct java.library.path. 798 // 799 // If we're launched by the Java launcher, and the user 800 // does not set java.library.path explicitly on the commandline, 801 // the Java launcher sets LD_LIBRARY_PATH for us and unsets 802 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case 803 // dlinfo returns LD_LIBRARY_PATH + crle settings (including 804 // /usr/lib), which is exactly what we want. 805 // 806 // If the user does set java.library.path, it completely 807 // overwrites this setting, and always has. 808 // 809 // If we're not launched by the Java launcher, we may 810 // get here with any/all of the LD_LIBRARY_PATH[_32|64] 811 // settings. Again, dlinfo does exactly what we want. 812 813 Dl_serinfo _info, *info = &_info; 814 Dl_serpath *path; 815 char* library_path; 816 char *common_path; 817 int i; 818 819 // determine search path count and required buffer size 820 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) { 821 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror()); 822 } 823 824 // allocate new buffer and initialize 825 info = (Dl_serinfo*)malloc(_info.dls_size); 826 if (info == NULL) { 827 vm_exit_out_of_memory(_info.dls_size, 828 "init_system_properties_values info"); 829 } 830 info->dls_size = _info.dls_size; 831 info->dls_cnt = _info.dls_cnt; 832 833 // obtain search path information 834 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) { 835 free(info); 836 vm_exit_during_initialization("dlinfo SERINFO request", dlerror()); 837 } 838 839 path = &info->dls_serpath[0]; 840 841 // Note: Due to a legacy implementation, most of the library path 842 // is set in the launcher. This was to accomodate linking restrictions 843 // on legacy Solaris implementations (which are no longer supported). 844 // Eventually, all the library path setting will be done here. 845 // 846 // However, to prevent the proliferation of improperly built native 847 // libraries, the new path component /usr/jdk/packages is added here. 848 849 // Determine the actual CPU architecture. 850 char cpu_arch[12]; 851 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 852#ifdef _LP64 853 // If we are a 64-bit vm, perform the following translations: 854 // sparc -> sparcv9 855 // i386 -> amd64 856 if (strcmp(cpu_arch, "sparc") == 0) 857 strcat(cpu_arch, "v9"); 858 else if (strcmp(cpu_arch, "i386") == 0) 859 strcpy(cpu_arch, "amd64"); 860#endif 861 862 // Construct the invariant part of ld_library_path. Note that the 863 // space for the colon and the trailing null are provided by the 864 // nulls included by the sizeof operator. 865 size_t bufsize = sizeof(COMMON_DIR) + sizeof("/lib/") + strlen(cpu_arch); 866 common_path = malloc(bufsize); 867 if (common_path == NULL) { 868 free(info); 869 vm_exit_out_of_memory(bufsize, 870 "init_system_properties_values common_path"); 871 } 872 sprintf(common_path, COMMON_DIR "/lib/%s", cpu_arch); 873 874 // struct size is more than sufficient for the path components obtained 875 // through the dlinfo() call, so only add additional space for the path 876 // components explicitly added here. 877 bufsize = info->dls_size + strlen(common_path); 878 library_path = malloc(bufsize); 879 if (library_path == NULL) { 880 free(info); 881 free(common_path); 882 vm_exit_out_of_memory(bufsize, 883 "init_system_properties_values library_path"); 884 } 885 library_path[0] = '\0'; 886 887 // Construct the desired Java library path from the linker's library 888 // search path. 889 // 890 // For compatibility, it is optimal that we insert the additional path 891 // components specific to the Java VM after those components specified 892 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so 893 // infrastructure. 894 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it 895 strcpy(library_path, common_path); 896 } else { 897 int inserted = 0; 898 for (i = 0; i < info->dls_cnt; i++, path++) { 899 uint_t flags = path->dls_flags & LA_SER_MASK; 900 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) { 901 strcat(library_path, common_path); 902 strcat(library_path, os::path_separator()); 903 inserted = 1; 904 } 905 strcat(library_path, path->dls_name); 906 strcat(library_path, os::path_separator()); 907 } 908 // eliminate trailing path separator 909 library_path[strlen(library_path)-1] = '\0'; 910 } 911 912 // happens before argument parsing - can't use a trace flag 913 // tty->print_raw("init_system_properties_values: native lib path: "); 914 // tty->print_raw_cr(library_path); 915 916 // callee copies into its own buffer 917 Arguments::set_library_path(library_path); 918 919 free(common_path); 920 free(library_path); 921 free(info); 922 } 923 924 /* 925 * Extensions directories. 926 * 927 * Note that the space for the colon and the trailing null are provided 928 * by the nulls included by the sizeof operator (so actually one byte more 929 * than necessary is allocated). 930 */ 931 { 932 char *buf = (char *) malloc(strlen(Arguments::get_java_home()) + 933 sizeof(EXTENSIONS_DIR) + sizeof(COMMON_DIR) + 934 sizeof(EXTENSIONS_DIR)); 935 sprintf(buf, "%s" EXTENSIONS_DIR ":" COMMON_DIR EXTENSIONS_DIR, 936 Arguments::get_java_home()); 937 Arguments::set_ext_dirs(buf); 938 } 939 940 /* Endorsed standards default directory. */ 941 { 942 char * buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); 943 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); 944 Arguments::set_endorsed_dirs(buf); 945 } 946 } 947 948#undef malloc 949#undef free 950#undef getenv 951#undef EXTENSIONS_DIR 952#undef ENDORSED_DIR 953#undef COMMON_DIR 954 955} 956 957void os::breakpoint() { 958 BREAKPOINT; 959} 960 961bool os::obsolete_option(const JavaVMOption *option) 962{ 963 if (!strncmp(option->optionString, "-Xt", 3)) { 964 return true; 965 } else if (!strncmp(option->optionString, "-Xtm", 4)) { 966 return true; 967 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) { 968 return true; 969 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) { 970 return true; 971 } 972 return false; 973} 974 975bool os::Solaris::valid_stack_address(Thread* thread, address sp) { 976 address stackStart = (address)thread->stack_base(); 977 address stackEnd = (address)(stackStart - (address)thread->stack_size()); 978 if (sp < stackStart && sp >= stackEnd ) return true; 979 return false; 980} 981 982extern "C" void breakpoint() { 983 // use debugger to set breakpoint here 984} 985 986static thread_t main_thread; 987 988// Thread start routine for all new Java threads 989extern "C" void* java_start(void* thread_addr) { 990 // Try to randomize the cache line index of hot stack frames. 991 // This helps when threads of the same stack traces evict each other's 992 // cache lines. The threads can be either from the same JVM instance, or 993 // from different JVM instances. The benefit is especially true for 994 // processors with hyperthreading technology. 995 static int counter = 0; 996 int pid = os::current_process_id(); 997 alloca(((pid ^ counter++) & 7) * 128); 998 999 int prio; 1000 Thread* thread = (Thread*)thread_addr; 1001 OSThread* osthr = thread->osthread(); 1002 1003 osthr->set_lwp_id( _lwp_self() ); // Store lwp in case we are bound 1004 thread->_schedctl = (void *) schedctl_init () ; 1005 1006 if (UseNUMA) { 1007 int lgrp_id = os::numa_get_group_id(); 1008 if (lgrp_id != -1) { 1009 thread->set_lgrp_id(lgrp_id); 1010 } 1011 } 1012 1013 // If the creator called set priority before we started, 1014 // we need to call set_native_priority now that we have an lwp. 1015 // We used to get the priority from thr_getprio (we called 1016 // thr_setprio way back in create_thread) and pass it to 1017 // set_native_priority, but Solaris scales the priority 1018 // in java_to_os_priority, so when we read it back here, 1019 // we pass trash to set_native_priority instead of what's 1020 // in java_to_os_priority. So we save the native priority 1021 // in the osThread and recall it here. 1022 1023 if ( osthr->thread_id() != -1 ) { 1024 if ( UseThreadPriorities ) { 1025 int prio = osthr->native_priority(); 1026 if (ThreadPriorityVerbose) { 1027 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " 1028 INTPTR_FORMAT ", setting priority: %d\n", 1029 osthr->thread_id(), osthr->lwp_id(), prio); 1030 } 1031 os::set_native_priority(thread, prio); 1032 } 1033 } else if (ThreadPriorityVerbose) { 1034 warning("Can't set priority in _start routine, thread id hasn't been set\n"); 1035 } 1036 1037 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 1038 1039 // initialize signal mask for this thread 1040 os::Solaris::hotspot_sigmask(thread); 1041 1042 thread->run(); 1043 1044 // One less thread is executing 1045 // When the VMThread gets here, the main thread may have already exited 1046 // which frees the CodeHeap containing the Atomic::dec code 1047 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 1048 Atomic::dec(&os::Solaris::_os_thread_count); 1049 } 1050 1051 if (UseDetachedThreads) { 1052 thr_exit(NULL); 1053 ShouldNotReachHere(); 1054 } 1055 return NULL; 1056} 1057 1058static OSThread* create_os_thread(Thread* thread, thread_t thread_id) { 1059 // Allocate the OSThread object 1060 OSThread* osthread = new OSThread(NULL, NULL); 1061 if (osthread == NULL) return NULL; 1062 1063 // Store info on the Solaris thread into the OSThread 1064 osthread->set_thread_id(thread_id); 1065 osthread->set_lwp_id(_lwp_self()); 1066 thread->_schedctl = (void *) schedctl_init () ; 1067 1068 if (UseNUMA) { 1069 int lgrp_id = os::numa_get_group_id(); 1070 if (lgrp_id != -1) { 1071 thread->set_lgrp_id(lgrp_id); 1072 } 1073 } 1074 1075 if ( ThreadPriorityVerbose ) { 1076 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n", 1077 osthread->thread_id(), osthread->lwp_id() ); 1078 } 1079 1080 // Initial thread state is INITIALIZED, not SUSPENDED 1081 osthread->set_state(INITIALIZED); 1082 1083 return osthread; 1084} 1085 1086void os::Solaris::hotspot_sigmask(Thread* thread) { 1087 1088 //Save caller's signal mask 1089 sigset_t sigmask; 1090 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask); 1091 OSThread *osthread = thread->osthread(); 1092 osthread->set_caller_sigmask(sigmask); 1093 1094 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL); 1095 if (!ReduceSignalUsage) { 1096 if (thread->is_VM_thread()) { 1097 // Only the VM thread handles BREAK_SIGNAL ... 1098 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL); 1099 } else { 1100 // ... all other threads block BREAK_SIGNAL 1101 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked"); 1102 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL); 1103 } 1104 } 1105} 1106 1107bool os::create_attached_thread(JavaThread* thread) { 1108#ifdef ASSERT 1109 thread->verify_not_published(); 1110#endif 1111 OSThread* osthread = create_os_thread(thread, thr_self()); 1112 if (osthread == NULL) { 1113 return false; 1114 } 1115 1116 // Initial thread state is RUNNABLE 1117 osthread->set_state(RUNNABLE); 1118 thread->set_osthread(osthread); 1119 1120 // initialize signal mask for this thread 1121 // and save the caller's signal mask 1122 os::Solaris::hotspot_sigmask(thread); 1123 1124 return true; 1125} 1126 1127bool os::create_main_thread(JavaThread* thread) { 1128#ifdef ASSERT 1129 thread->verify_not_published(); 1130#endif 1131 if (_starting_thread == NULL) { 1132 _starting_thread = create_os_thread(thread, main_thread); 1133 if (_starting_thread == NULL) { 1134 return false; 1135 } 1136 } 1137 1138 // The primodial thread is runnable from the start 1139 _starting_thread->set_state(RUNNABLE); 1140 1141 thread->set_osthread(_starting_thread); 1142 1143 // initialize signal mask for this thread 1144 // and save the caller's signal mask 1145 os::Solaris::hotspot_sigmask(thread); 1146 1147 return true; 1148} 1149 1150// _T2_libthread is true if we believe we are running with the newer 1151// SunSoft lwp/libthread.so (2.8 patch, 2.9 default) 1152bool os::Solaris::_T2_libthread = false; 1153 1154bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 1155 // Allocate the OSThread object 1156 OSThread* osthread = new OSThread(NULL, NULL); 1157 if (osthread == NULL) { 1158 return false; 1159 } 1160 1161 if ( ThreadPriorityVerbose ) { 1162 char *thrtyp; 1163 switch ( thr_type ) { 1164 case vm_thread: 1165 thrtyp = (char *)"vm"; 1166 break; 1167 case cgc_thread: 1168 thrtyp = (char *)"cgc"; 1169 break; 1170 case pgc_thread: 1171 thrtyp = (char *)"pgc"; 1172 break; 1173 case java_thread: 1174 thrtyp = (char *)"java"; 1175 break; 1176 case compiler_thread: 1177 thrtyp = (char *)"compiler"; 1178 break; 1179 case watcher_thread: 1180 thrtyp = (char *)"watcher"; 1181 break; 1182 default: 1183 thrtyp = (char *)"unknown"; 1184 break; 1185 } 1186 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp); 1187 } 1188 1189 // Calculate stack size if it's not specified by caller. 1190 if (stack_size == 0) { 1191 // The default stack size 1M (2M for LP64). 1192 stack_size = (BytesPerWord >> 2) * K * K; 1193 1194 switch (thr_type) { 1195 case os::java_thread: 1196 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 1197 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create(); 1198 break; 1199 case os::compiler_thread: 1200 if (CompilerThreadStackSize > 0) { 1201 stack_size = (size_t)(CompilerThreadStackSize * K); 1202 break; 1203 } // else fall through: 1204 // use VMThreadStackSize if CompilerThreadStackSize is not defined 1205 case os::vm_thread: 1206 case os::pgc_thread: 1207 case os::cgc_thread: 1208 case os::watcher_thread: 1209 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 1210 break; 1211 } 1212 } 1213 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed); 1214 1215 // Initial state is ALLOCATED but not INITIALIZED 1216 osthread->set_state(ALLOCATED); 1217 1218 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) { 1219 // We got lots of threads. Check if we still have some address space left. 1220 // Need to be at least 5Mb of unreserved address space. We do check by 1221 // trying to reserve some. 1222 const size_t VirtualMemoryBangSize = 20*K*K; 1223 char* mem = os::reserve_memory(VirtualMemoryBangSize); 1224 if (mem == NULL) { 1225 delete osthread; 1226 return false; 1227 } else { 1228 // Release the memory again 1229 os::release_memory(mem, VirtualMemoryBangSize); 1230 } 1231 } 1232 1233 // Setup osthread because the child thread may need it. 1234 thread->set_osthread(osthread); 1235 1236 // Create the Solaris thread 1237 // explicit THR_BOUND for T2_libthread case in case 1238 // that assumption is not accurate, but our alternate signal stack 1239 // handling is based on it which must have bound threads 1240 thread_t tid = 0; 1241 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED 1242 | ((UseBoundThreads || os::Solaris::T2_libthread() || 1243 (thr_type == vm_thread) || 1244 (thr_type == cgc_thread) || 1245 (thr_type == pgc_thread) || 1246 (thr_type == compiler_thread && BackgroundCompilation)) ? 1247 THR_BOUND : 0); 1248 int status; 1249 1250 // 4376845 -- libthread/kernel don't provide enough LWPs to utilize all CPUs. 1251 // 1252 // On multiprocessors systems, libthread sometimes under-provisions our 1253 // process with LWPs. On a 30-way systems, for instance, we could have 1254 // 50 user-level threads in ready state and only 2 or 3 LWPs assigned 1255 // to our process. This can result in under utilization of PEs. 1256 // I suspect the problem is related to libthread's LWP 1257 // pool management and to the kernel's SIGBLOCKING "last LWP parked" 1258 // upcall policy. 1259 // 1260 // The following code is palliative -- it attempts to ensure that our 1261 // process has sufficient LWPs to take advantage of multiple PEs. 1262 // Proper long-term cures include using user-level threads bound to LWPs 1263 // (THR_BOUND) or using LWP-based synchronization. Note that there is a 1264 // slight timing window with respect to sampling _os_thread_count, but 1265 // the race is benign. Also, we should periodically recompute 1266 // _processors_online as the min of SC_NPROCESSORS_ONLN and the 1267 // the number of PEs in our partition. You might be tempted to use 1268 // THR_NEW_LWP here, but I'd recommend against it as that could 1269 // result in undesirable growth of the libthread's LWP pool. 1270 // The fix below isn't sufficient; for instance, it doesn't take into count 1271 // LWPs parked on IO. It does, however, help certain CPU-bound benchmarks. 1272 // 1273 // Some pathologies this scheme doesn't handle: 1274 // * Threads can block, releasing the LWPs. The LWPs can age out. 1275 // When a large number of threads become ready again there aren't 1276 // enough LWPs available to service them. This can occur when the 1277 // number of ready threads oscillates. 1278 // * LWPs/Threads park on IO, thus taking the LWP out of circulation. 1279 // 1280 // Finally, we should call thr_setconcurrency() periodically to refresh 1281 // the LWP pool and thwart the LWP age-out mechanism. 1282 // The "+3" term provides a little slop -- we want to slightly overprovision. 1283 1284 if (AdjustConcurrency && os::Solaris::_os_thread_count < (_processors_online+3)) { 1285 if (!(flags & THR_BOUND)) { 1286 thr_setconcurrency (os::Solaris::_os_thread_count); // avoid starvation 1287 } 1288 } 1289 // Although this doesn't hurt, we should warn of undefined behavior 1290 // when using unbound T1 threads with schedctl(). This should never 1291 // happen, as the compiler and VM threads are always created bound 1292 DEBUG_ONLY( 1293 if ((VMThreadHintNoPreempt || CompilerThreadHintNoPreempt) && 1294 (!os::Solaris::T2_libthread() && (!(flags & THR_BOUND))) && 1295 ((thr_type == vm_thread) || (thr_type == cgc_thread) || 1296 (thr_type == pgc_thread) || (thr_type == compiler_thread && BackgroundCompilation))) { 1297 warning("schedctl behavior undefined when Compiler/VM/GC Threads are Unbound"); 1298 } 1299 ); 1300 1301 1302 // Mark that we don't have an lwp or thread id yet. 1303 // In case we attempt to set the priority before the thread starts. 1304 osthread->set_lwp_id(-1); 1305 osthread->set_thread_id(-1); 1306 1307 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid); 1308 if (status != 0) { 1309 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1310 perror("os::create_thread"); 1311 } 1312 thread->set_osthread(NULL); 1313 // Need to clean up stuff we've allocated so far 1314 delete osthread; 1315 return false; 1316 } 1317 1318 Atomic::inc(&os::Solaris::_os_thread_count); 1319 1320 // Store info on the Solaris thread into the OSThread 1321 osthread->set_thread_id(tid); 1322 1323 // Remember that we created this thread so we can set priority on it 1324 osthread->set_vm_created(); 1325 1326 // Set the default thread priority. If using bound threads, setting 1327 // lwp priority will be delayed until thread start. 1328 set_native_priority(thread, 1329 DefaultThreadPriority == -1 ? 1330 java_to_os_priority[NormPriority] : 1331 DefaultThreadPriority); 1332 1333 // Initial thread state is INITIALIZED, not SUSPENDED 1334 osthread->set_state(INITIALIZED); 1335 1336 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 1337 return true; 1338} 1339 1340/* defined for >= Solaris 10. This allows builds on earlier versions 1341 * of Solaris to take advantage of the newly reserved Solaris JVM signals 1342 * With SIGJVM1, SIGJVM2, INTERRUPT_SIGNAL is SIGJVM1, ASYNC_SIGNAL is SIGJVM2 1343 * and -XX:+UseAltSigs does nothing since these should have no conflict 1344 */ 1345#if !defined(SIGJVM1) 1346#define SIGJVM1 39 1347#define SIGJVM2 40 1348#endif 1349 1350debug_only(static bool signal_sets_initialized = false); 1351static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 1352int os::Solaris::_SIGinterrupt = INTERRUPT_SIGNAL; 1353int os::Solaris::_SIGasync = ASYNC_SIGNAL; 1354 1355bool os::Solaris::is_sig_ignored(int sig) { 1356 struct sigaction oact; 1357 sigaction(sig, (struct sigaction*)NULL, &oact); 1358 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 1359 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 1360 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) 1361 return true; 1362 else 1363 return false; 1364} 1365 1366// Note: SIGRTMIN is a macro that calls sysconf() so it will 1367// dynamically detect SIGRTMIN value for the system at runtime, not buildtime 1368static bool isJVM1available() { 1369 return SIGJVM1 < SIGRTMIN; 1370} 1371 1372void os::Solaris::signal_sets_init() { 1373 // Should also have an assertion stating we are still single-threaded. 1374 assert(!signal_sets_initialized, "Already initialized"); 1375 // Fill in signals that are necessarily unblocked for all threads in 1376 // the VM. Currently, we unblock the following signals: 1377 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 1378 // by -Xrs (=ReduceSignalUsage)); 1379 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 1380 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 1381 // the dispositions or masks wrt these signals. 1382 // Programs embedding the VM that want to use the above signals for their 1383 // own purposes must, at this time, use the "-Xrs" option to prevent 1384 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 1385 // (See bug 4345157, and other related bugs). 1386 // In reality, though, unblocking these signals is really a nop, since 1387 // these signals are not blocked by default. 1388 sigemptyset(&unblocked_sigs); 1389 sigemptyset(&allowdebug_blocked_sigs); 1390 sigaddset(&unblocked_sigs, SIGILL); 1391 sigaddset(&unblocked_sigs, SIGSEGV); 1392 sigaddset(&unblocked_sigs, SIGBUS); 1393 sigaddset(&unblocked_sigs, SIGFPE); 1394 1395 if (isJVM1available) { 1396 os::Solaris::set_SIGinterrupt(SIGJVM1); 1397 os::Solaris::set_SIGasync(SIGJVM2); 1398 } else if (UseAltSigs) { 1399 os::Solaris::set_SIGinterrupt(ALT_INTERRUPT_SIGNAL); 1400 os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL); 1401 } else { 1402 os::Solaris::set_SIGinterrupt(INTERRUPT_SIGNAL); 1403 os::Solaris::set_SIGasync(ASYNC_SIGNAL); 1404 } 1405 1406 sigaddset(&unblocked_sigs, os::Solaris::SIGinterrupt()); 1407 sigaddset(&unblocked_sigs, os::Solaris::SIGasync()); 1408 1409 if (!ReduceSignalUsage) { 1410 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 1411 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 1412 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 1413 } 1414 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 1415 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 1416 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 1417 } 1418 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 1419 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 1420 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 1421 } 1422 } 1423 // Fill in signals that are blocked by all but the VM thread. 1424 sigemptyset(&vm_sigs); 1425 if (!ReduceSignalUsage) 1426 sigaddset(&vm_sigs, BREAK_SIGNAL); 1427 debug_only(signal_sets_initialized = true); 1428 1429 // For diagnostics only used in run_periodic_checks 1430 sigemptyset(&check_signal_done); 1431} 1432 1433// These are signals that are unblocked while a thread is running Java. 1434// (For some reason, they get blocked by default.) 1435sigset_t* os::Solaris::unblocked_signals() { 1436 assert(signal_sets_initialized, "Not initialized"); 1437 return &unblocked_sigs; 1438} 1439 1440// These are the signals that are blocked while a (non-VM) thread is 1441// running Java. Only the VM thread handles these signals. 1442sigset_t* os::Solaris::vm_signals() { 1443 assert(signal_sets_initialized, "Not initialized"); 1444 return &vm_sigs; 1445} 1446 1447// These are signals that are blocked during cond_wait to allow debugger in 1448sigset_t* os::Solaris::allowdebug_blocked_signals() { 1449 assert(signal_sets_initialized, "Not initialized"); 1450 return &allowdebug_blocked_sigs; 1451} 1452 1453 1454void _handle_uncaught_cxx_exception() { 1455 VMError err("An uncaught C++ exception"); 1456 err.report_and_die(); 1457} 1458 1459 1460// First crack at OS-specific initialization, from inside the new thread. 1461void os::initialize_thread(Thread* thr) { 1462 int r = thr_main() ; 1463 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ; 1464 if (r) { 1465 JavaThread* jt = (JavaThread *)thr; 1466 assert(jt != NULL,"Sanity check"); 1467 size_t stack_size; 1468 address base = jt->stack_base(); 1469 if (Arguments::created_by_java_launcher()) { 1470 // Use 2MB to allow for Solaris 7 64 bit mode. 1471 stack_size = JavaThread::stack_size_at_create() == 0 1472 ? 2048*K : JavaThread::stack_size_at_create(); 1473 1474 // There are rare cases when we may have already used more than 1475 // the basic stack size allotment before this method is invoked. 1476 // Attempt to allow for a normally sized java_stack. 1477 size_t current_stack_offset = (size_t)(base - (address)&stack_size); 1478 stack_size += ReservedSpace::page_align_size_down(current_stack_offset); 1479 } else { 1480 // 6269555: If we were not created by a Java launcher, i.e. if we are 1481 // running embedded in a native application, treat the primordial thread 1482 // as much like a native attached thread as possible. This means using 1483 // the current stack size from thr_stksegment(), unless it is too large 1484 // to reliably setup guard pages. A reasonable max size is 8MB. 1485 size_t current_size = current_stack_size(); 1486 // This should never happen, but just in case.... 1487 if (current_size == 0) current_size = 2 * K * K; 1488 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size; 1489 } 1490 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());; 1491 stack_size = (size_t)(base - bottom); 1492 1493 assert(stack_size > 0, "Stack size calculation problem"); 1494 1495 if (stack_size > jt->stack_size()) { 1496 NOT_PRODUCT( 1497 struct rlimit limits; 1498 getrlimit(RLIMIT_STACK, &limits); 1499 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur); 1500 assert(size >= jt->stack_size(), "Stack size problem in main thread"); 1501 ) 1502 tty->print_cr( 1503 "Stack size of %d Kb exceeds current limit of %d Kb.\n" 1504 "(Stack sizes are rounded up to a multiple of the system page size.)\n" 1505 "See limit(1) to increase the stack size limit.", 1506 stack_size / K, jt->stack_size() / K); 1507 vm_exit(1); 1508 } 1509 assert(jt->stack_size() >= stack_size, 1510 "Attempt to map more stack than was allocated"); 1511 jt->set_stack_size(stack_size); 1512 } 1513 1514 // 5/22/01: Right now alternate signal stacks do not handle 1515 // throwing stack overflow exceptions, see bug 4463178 1516 // Until a fix is found for this, T2 will NOT imply alternate signal 1517 // stacks. 1518 // If using T2 libthread threads, install an alternate signal stack. 1519 // Because alternate stacks associate with LWPs on Solaris, 1520 // see sigaltstack(2), if using UNBOUND threads, or if UseBoundThreads 1521 // we prefer to explicitly stack bang. 1522 // If not using T2 libthread, but using UseBoundThreads any threads 1523 // (primordial thread, jni_attachCurrentThread) we do not create, 1524 // probably are not bound, therefore they can not have an alternate 1525 // signal stack. Since our stack banging code is generated and 1526 // is shared across threads, all threads must be bound to allow 1527 // using alternate signal stacks. The alternative is to interpose 1528 // on _lwp_create to associate an alt sig stack with each LWP, 1529 // and this could be a problem when the JVM is embedded. 1530 // We would prefer to use alternate signal stacks with T2 1531 // Since there is currently no accurate way to detect T2 1532 // we do not. Assuming T2 when running T1 causes sig 11s or assertions 1533 // on installing alternate signal stacks 1534 1535 1536 // 05/09/03: removed alternate signal stack support for Solaris 1537 // The alternate signal stack mechanism is no longer needed to 1538 // handle stack overflow. This is now handled by allocating 1539 // guard pages (red zone) and stackbanging. 1540 // Initially the alternate signal stack mechanism was removed because 1541 // it did not work with T1 llibthread. Alternate 1542 // signal stacks MUST have all threads bound to lwps. Applications 1543 // can create their own threads and attach them without their being 1544 // bound under T1. This is frequently the case for the primordial thread. 1545 // If we were ever to reenable this mechanism we would need to 1546 // use the dynamic check for T2 libthread. 1547 1548 os::Solaris::init_thread_fpu_state(); 1549 std::set_terminate(_handle_uncaught_cxx_exception); 1550} 1551 1552 1553 1554// Free Solaris resources related to the OSThread 1555void os::free_thread(OSThread* osthread) { 1556 assert(osthread != NULL, "os::free_thread but osthread not set"); 1557 1558 1559 // We are told to free resources of the argument thread, 1560 // but we can only really operate on the current thread. 1561 // The main thread must take the VMThread down synchronously 1562 // before the main thread exits and frees up CodeHeap 1563 guarantee((Thread::current()->osthread() == osthread 1564 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread"); 1565 if (Thread::current()->osthread() == osthread) { 1566 // Restore caller's signal mask 1567 sigset_t sigmask = osthread->caller_sigmask(); 1568 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL); 1569 } 1570 delete osthread; 1571} 1572 1573void os::pd_start_thread(Thread* thread) { 1574 int status = thr_continue(thread->osthread()->thread_id()); 1575 assert_status(status == 0, status, "thr_continue failed"); 1576} 1577 1578 1579intx os::current_thread_id() { 1580 return (intx)thr_self(); 1581} 1582 1583static pid_t _initial_pid = 0; 1584 1585int os::current_process_id() { 1586 return (int)(_initial_pid ? _initial_pid : getpid()); 1587} 1588 1589int os::allocate_thread_local_storage() { 1590 // %%% in Win32 this allocates a memory segment pointed to by a 1591 // register. Dan Stein can implement a similar feature in 1592 // Solaris. Alternatively, the VM can do the same thing 1593 // explicitly: malloc some storage and keep the pointer in a 1594 // register (which is part of the thread's context) (or keep it 1595 // in TLS). 1596 // %%% In current versions of Solaris, thr_self and TSD can 1597 // be accessed via short sequences of displaced indirections. 1598 // The value of thr_self is available as %g7(36). 1599 // The value of thr_getspecific(k) is stored in %g7(12)(4)(k*4-4), 1600 // assuming that the current thread already has a value bound to k. 1601 // It may be worth experimenting with such access patterns, 1602 // and later having the parameters formally exported from a Solaris 1603 // interface. I think, however, that it will be faster to 1604 // maintain the invariant that %g2 always contains the 1605 // JavaThread in Java code, and have stubs simply 1606 // treat %g2 as a caller-save register, preserving it in a %lN. 1607 thread_key_t tk; 1608 if (thr_keycreate( &tk, NULL ) ) 1609 fatal(err_msg("os::allocate_thread_local_storage: thr_keycreate failed " 1610 "(%s)", strerror(errno))); 1611 return int(tk); 1612} 1613 1614void os::free_thread_local_storage(int index) { 1615 // %%% don't think we need anything here 1616 // if ( pthread_key_delete((pthread_key_t) tk) ) 1617 // fatal("os::free_thread_local_storage: pthread_key_delete failed"); 1618} 1619 1620#define SMALLINT 32 // libthread allocate for tsd_common is a version specific 1621 // small number - point is NO swap space available 1622void os::thread_local_storage_at_put(int index, void* value) { 1623 // %%% this is used only in threadLocalStorage.cpp 1624 if (thr_setspecific((thread_key_t)index, value)) { 1625 if (errno == ENOMEM) { 1626 vm_exit_out_of_memory(SMALLINT, "thr_setspecific: out of swap space"); 1627 } else { 1628 fatal(err_msg("os::thread_local_storage_at_put: thr_setspecific failed " 1629 "(%s)", strerror(errno))); 1630 } 1631 } else { 1632 ThreadLocalStorage::set_thread_in_slot ((Thread *) value) ; 1633 } 1634} 1635 1636// This function could be called before TLS is initialized, for example, when 1637// VM receives an async signal or when VM causes a fatal error during 1638// initialization. Return NULL if thr_getspecific() fails. 1639void* os::thread_local_storage_at(int index) { 1640 // %%% this is used only in threadLocalStorage.cpp 1641 void* r = NULL; 1642 return thr_getspecific((thread_key_t)index, &r) != 0 ? NULL : r; 1643} 1644 1645 1646// gethrtime can move backwards if read from one cpu and then a different cpu 1647// getTimeNanos is guaranteed to not move backward on Solaris 1648// local spinloop created as faster for a CAS on an int than 1649// a CAS on a 64bit jlong. Also Atomic::cmpxchg for jlong is not 1650// supported on sparc v8 or pre supports_cx8 intel boxes. 1651// oldgetTimeNanos for systems which do not support CAS on 64bit jlong 1652// i.e. sparc v8 and pre supports_cx8 (i486) intel boxes 1653inline hrtime_t oldgetTimeNanos() { 1654 int gotlock = LOCK_INVALID; 1655 hrtime_t newtime = gethrtime(); 1656 1657 for (;;) { 1658// grab lock for max_hrtime 1659 int curlock = max_hrtime_lock; 1660 if (curlock & LOCK_BUSY) continue; 1661 if (gotlock = Atomic::cmpxchg(LOCK_BUSY, &max_hrtime_lock, LOCK_FREE) != LOCK_FREE) continue; 1662 if (newtime > max_hrtime) { 1663 max_hrtime = newtime; 1664 } else { 1665 newtime = max_hrtime; 1666 } 1667 // release lock 1668 max_hrtime_lock = LOCK_FREE; 1669 return newtime; 1670 } 1671} 1672// gethrtime can move backwards if read from one cpu and then a different cpu 1673// getTimeNanos is guaranteed to not move backward on Solaris 1674inline hrtime_t getTimeNanos() { 1675 if (VM_Version::supports_cx8()) { 1676 const hrtime_t now = gethrtime(); 1677 // Use atomic long load since 32-bit x86 uses 2 registers to keep long. 1678 const hrtime_t prev = Atomic::load((volatile jlong*)&max_hrtime); 1679 if (now <= prev) return prev; // same or retrograde time; 1680 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev); 1681 assert(obsv >= prev, "invariant"); // Monotonicity 1682 // If the CAS succeeded then we're done and return "now". 1683 // If the CAS failed and the observed value "obs" is >= now then 1684 // we should return "obs". If the CAS failed and now > obs > prv then 1685 // some other thread raced this thread and installed a new value, in which case 1686 // we could either (a) retry the entire operation, (b) retry trying to install now 1687 // or (c) just return obs. We use (c). No loop is required although in some cases 1688 // we might discard a higher "now" value in deference to a slightly lower but freshly 1689 // installed obs value. That's entirely benign -- it admits no new orderings compared 1690 // to (a) or (b) -- and greatly reduces coherence traffic. 1691 // We might also condition (c) on the magnitude of the delta between obs and now. 1692 // Avoiding excessive CAS operations to hot RW locations is critical. 1693 // See http://blogs.sun.com/dave/entry/cas_and_cache_trivia_invalidate 1694 return (prev == obsv) ? now : obsv ; 1695 } else { 1696 return oldgetTimeNanos(); 1697 } 1698} 1699 1700// Time since start-up in seconds to a fine granularity. 1701// Used by VMSelfDestructTimer and the MemProfiler. 1702double os::elapsedTime() { 1703 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; 1704} 1705 1706jlong os::elapsed_counter() { 1707 return (jlong)(getTimeNanos() - first_hrtime); 1708} 1709 1710jlong os::elapsed_frequency() { 1711 return hrtime_hz; 1712} 1713 1714// Return the real, user, and system times in seconds from an 1715// arbitrary fixed point in the past. 1716bool os::getTimesSecs(double* process_real_time, 1717 double* process_user_time, 1718 double* process_system_time) { 1719 struct tms ticks; 1720 clock_t real_ticks = times(&ticks); 1721 1722 if (real_ticks == (clock_t) (-1)) { 1723 return false; 1724 } else { 1725 double ticks_per_second = (double) clock_tics_per_sec; 1726 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1727 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1728 // For consistency return the real time from getTimeNanos() 1729 // converted to seconds. 1730 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS); 1731 1732 return true; 1733 } 1734} 1735 1736bool os::supports_vtime() { return true; } 1737 1738bool os::enable_vtime() { 1739 int fd = ::open("/proc/self/ctl", O_WRONLY); 1740 if (fd == -1) 1741 return false; 1742 1743 long cmd[] = { PCSET, PR_MSACCT }; 1744 int res = ::write(fd, cmd, sizeof(long) * 2); 1745 ::close(fd); 1746 if (res != sizeof(long) * 2) 1747 return false; 1748 1749 return true; 1750} 1751 1752bool os::vtime_enabled() { 1753 int fd = ::open("/proc/self/status", O_RDONLY); 1754 if (fd == -1) 1755 return false; 1756 1757 pstatus_t status; 1758 int res = os::read(fd, (void*) &status, sizeof(pstatus_t)); 1759 ::close(fd); 1760 if (res != sizeof(pstatus_t)) 1761 return false; 1762 1763 return status.pr_flags & PR_MSACCT; 1764} 1765 1766double os::elapsedVTime() { 1767 return (double)gethrvtime() / (double)hrtime_hz; 1768} 1769 1770// Used internally for comparisons only 1771// getTimeMillis guaranteed to not move backwards on Solaris 1772jlong getTimeMillis() { 1773 jlong nanotime = getTimeNanos(); 1774 return (jlong)(nanotime / NANOSECS_PER_MILLISEC); 1775} 1776 1777// Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis 1778jlong os::javaTimeMillis() { 1779 timeval t; 1780 if (gettimeofday( &t, NULL) == -1) 1781 fatal(err_msg("os::javaTimeMillis: gettimeofday (%s)", strerror(errno))); 1782 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000; 1783} 1784 1785jlong os::javaTimeNanos() { 1786 return (jlong)getTimeNanos(); 1787} 1788 1789void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1790 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits 1791 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1792 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1793 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1794} 1795 1796char * os::local_time_string(char *buf, size_t buflen) { 1797 struct tm t; 1798 time_t long_time; 1799 time(&long_time); 1800 localtime_r(&long_time, &t); 1801 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1802 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1803 t.tm_hour, t.tm_min, t.tm_sec); 1804 return buf; 1805} 1806 1807// Note: os::shutdown() might be called very early during initialization, or 1808// called from signal handler. Before adding something to os::shutdown(), make 1809// sure it is async-safe and can handle partially initialized VM. 1810void os::shutdown() { 1811 1812 // allow PerfMemory to attempt cleanup of any persistent resources 1813 perfMemory_exit(); 1814 1815 // needs to remove object in file system 1816 AttachListener::abort(); 1817 1818 // flush buffered output, finish log files 1819 ostream_abort(); 1820 1821 // Check for abort hook 1822 abort_hook_t abort_hook = Arguments::abort_hook(); 1823 if (abort_hook != NULL) { 1824 abort_hook(); 1825 } 1826} 1827 1828// Note: os::abort() might be called very early during initialization, or 1829// called from signal handler. Before adding something to os::abort(), make 1830// sure it is async-safe and can handle partially initialized VM. 1831void os::abort(bool dump_core) { 1832 os::shutdown(); 1833 if (dump_core) { 1834#ifndef PRODUCT 1835 fdStream out(defaultStream::output_fd()); 1836 out.print_raw("Current thread is "); 1837 char buf[16]; 1838 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1839 out.print_raw_cr(buf); 1840 out.print_raw_cr("Dumping core ..."); 1841#endif 1842 ::abort(); // dump core (for debugging) 1843 } 1844 1845 ::exit(1); 1846} 1847 1848// Die immediately, no exit hook, no abort hook, no cleanup. 1849void os::die() { 1850 ::abort(); // dump core (for debugging) 1851} 1852 1853// unused 1854void os::set_error_file(const char *logfile) {} 1855 1856// DLL functions 1857 1858const char* os::dll_file_extension() { return ".so"; } 1859 1860// This must be hard coded because it's the system's temporary 1861// directory not the java application's temp directory, ala java.io.tmpdir. 1862const char* os::get_temp_directory() { return "/tmp"; } 1863 1864static bool file_exists(const char* filename) { 1865 struct stat statbuf; 1866 if (filename == NULL || strlen(filename) == 0) { 1867 return false; 1868 } 1869 return os::stat(filename, &statbuf) == 0; 1870} 1871 1872bool os::dll_build_name(char* buffer, size_t buflen, 1873 const char* pname, const char* fname) { 1874 bool retval = false; 1875 const size_t pnamelen = pname ? strlen(pname) : 0; 1876 1877 // Return error on buffer overflow. 1878 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { 1879 return retval; 1880 } 1881 1882 if (pnamelen == 0) { 1883 snprintf(buffer, buflen, "lib%s.so", fname); 1884 retval = true; 1885 } else if (strchr(pname, *os::path_separator()) != NULL) { 1886 int n; 1887 char** pelements = split_path(pname, &n); 1888 if (pelements == NULL) { 1889 return false; 1890 } 1891 for (int i = 0 ; i < n ; i++) { 1892 // really shouldn't be NULL but what the heck, check can't hurt 1893 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1894 continue; // skip the empty path values 1895 } 1896 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); 1897 if (file_exists(buffer)) { 1898 retval = true; 1899 break; 1900 } 1901 } 1902 // release the storage 1903 for (int i = 0 ; i < n ; i++) { 1904 if (pelements[i] != NULL) { 1905 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); 1906 } 1907 } 1908 if (pelements != NULL) { 1909 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); 1910 } 1911 } else { 1912 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); 1913 retval = true; 1914 } 1915 return retval; 1916} 1917 1918const char* os::get_current_directory(char *buf, int buflen) { 1919 return getcwd(buf, buflen); 1920} 1921 1922// check if addr is inside libjvm.so 1923bool os::address_is_in_vm(address addr) { 1924 static address libjvm_base_addr; 1925 Dl_info dlinfo; 1926 1927 if (libjvm_base_addr == NULL) { 1928 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); 1929 libjvm_base_addr = (address)dlinfo.dli_fbase; 1930 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1931 } 1932 1933 if (dladdr((void *)addr, &dlinfo)) { 1934 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1935 } 1936 1937 return false; 1938} 1939 1940typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int); 1941static dladdr1_func_type dladdr1_func = NULL; 1942 1943bool os::dll_address_to_function_name(address addr, char *buf, 1944 int buflen, int * offset) { 1945 Dl_info dlinfo; 1946 1947 // dladdr1_func was initialized in os::init() 1948 if (dladdr1_func){ 1949 // yes, we have dladdr1 1950 1951 // Support for dladdr1 is checked at runtime; it may be 1952 // available even if the vm is built on a machine that does 1953 // not have dladdr1 support. Make sure there is a value for 1954 // RTLD_DL_SYMENT. 1955 #ifndef RTLD_DL_SYMENT 1956 #define RTLD_DL_SYMENT 1 1957 #endif 1958#ifdef _LP64 1959 Elf64_Sym * info; 1960#else 1961 Elf32_Sym * info; 1962#endif 1963 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, 1964 RTLD_DL_SYMENT)) { 1965 if ((char *)dlinfo.dli_saddr + info->st_size > (char *)addr) { 1966 if (buf != NULL) { 1967 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) 1968 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1969 } 1970 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1971 return true; 1972 } 1973 } 1974 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { 1975 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1976 buf, buflen, offset, dlinfo.dli_fname)) { 1977 return true; 1978 } 1979 } 1980 if (buf != NULL) buf[0] = '\0'; 1981 if (offset != NULL) *offset = -1; 1982 return false; 1983 } else { 1984 // no, only dladdr is available 1985 if (dladdr((void *)addr, &dlinfo)) { 1986 if (buf != NULL) { 1987 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) 1988 jio_snprintf(buf, buflen, dlinfo.dli_sname); 1989 } 1990 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1991 return true; 1992 } else if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != 0) { 1993 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1994 buf, buflen, offset, dlinfo.dli_fname)) { 1995 return true; 1996 } 1997 } 1998 if (buf != NULL) buf[0] = '\0'; 1999 if (offset != NULL) *offset = -1; 2000 return false; 2001 } 2002} 2003 2004bool os::dll_address_to_library_name(address addr, char* buf, 2005 int buflen, int* offset) { 2006 Dl_info dlinfo; 2007 2008 if (dladdr((void*)addr, &dlinfo)){ 2009 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 2010 if (offset) *offset = addr - (address)dlinfo.dli_fbase; 2011 return true; 2012 } else { 2013 if (buf) buf[0] = '\0'; 2014 if (offset) *offset = -1; 2015 return false; 2016 } 2017} 2018 2019// Prints the names and full paths of all opened dynamic libraries 2020// for current process 2021void os::print_dll_info(outputStream * st) { 2022 Dl_info dli; 2023 void *handle; 2024 Link_map *map; 2025 Link_map *p; 2026 2027 st->print_cr("Dynamic libraries:"); st->flush(); 2028 2029 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { 2030 st->print_cr("Error: Cannot print dynamic libraries."); 2031 return; 2032 } 2033 handle = dlopen(dli.dli_fname, RTLD_LAZY); 2034 if (handle == NULL) { 2035 st->print_cr("Error: Cannot print dynamic libraries."); 2036 return; 2037 } 2038 dlinfo(handle, RTLD_DI_LINKMAP, &map); 2039 if (map == NULL) { 2040 st->print_cr("Error: Cannot print dynamic libraries."); 2041 return; 2042 } 2043 2044 while (map->l_prev != NULL) 2045 map = map->l_prev; 2046 2047 while (map != NULL) { 2048 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); 2049 map = map->l_next; 2050 } 2051 2052 dlclose(handle); 2053} 2054 2055 // Loads .dll/.so and 2056 // in case of error it checks if .dll/.so was built for the 2057 // same architecture as Hotspot is running on 2058 2059void * os::dll_load(const char *filename, char *ebuf, int ebuflen) 2060{ 2061 void * result= ::dlopen(filename, RTLD_LAZY); 2062 if (result != NULL) { 2063 // Successful loading 2064 return result; 2065 } 2066 2067 Elf32_Ehdr elf_head; 2068 2069 // Read system error message into ebuf 2070 // It may or may not be overwritten below 2071 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 2072 ebuf[ebuflen-1]='\0'; 2073 int diag_msg_max_length=ebuflen-strlen(ebuf); 2074 char* diag_msg_buf=ebuf+strlen(ebuf); 2075 2076 if (diag_msg_max_length==0) { 2077 // No more space in ebuf for additional diagnostics message 2078 return NULL; 2079 } 2080 2081 2082 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 2083 2084 if (file_descriptor < 0) { 2085 // Can't open library, report dlerror() message 2086 return NULL; 2087 } 2088 2089 bool failed_to_read_elf_head= 2090 (sizeof(elf_head)!= 2091 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; 2092 2093 ::close(file_descriptor); 2094 if (failed_to_read_elf_head) { 2095 // file i/o error - report dlerror() msg 2096 return NULL; 2097 } 2098 2099 typedef struct { 2100 Elf32_Half code; // Actual value as defined in elf.h 2101 Elf32_Half compat_class; // Compatibility of archs at VM's sense 2102 char elf_class; // 32 or 64 bit 2103 char endianess; // MSB or LSB 2104 char* name; // String representation 2105 } arch_t; 2106 2107 static const arch_t arch_array[]={ 2108 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 2109 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 2110 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 2111 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 2112 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 2113 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 2114 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 2115 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 2116 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 2117 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"} 2118 }; 2119 2120 #if (defined IA32) 2121 static Elf32_Half running_arch_code=EM_386; 2122 #elif (defined AMD64) 2123 static Elf32_Half running_arch_code=EM_X86_64; 2124 #elif (defined IA64) 2125 static Elf32_Half running_arch_code=EM_IA_64; 2126 #elif (defined __sparc) && (defined _LP64) 2127 static Elf32_Half running_arch_code=EM_SPARCV9; 2128 #elif (defined __sparc) && (!defined _LP64) 2129 static Elf32_Half running_arch_code=EM_SPARC; 2130 #elif (defined __powerpc64__) 2131 static Elf32_Half running_arch_code=EM_PPC64; 2132 #elif (defined __powerpc__) 2133 static Elf32_Half running_arch_code=EM_PPC; 2134 #elif (defined ARM) 2135 static Elf32_Half running_arch_code=EM_ARM; 2136 #else 2137 #error Method os::dll_load requires that one of following is defined:\ 2138 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM 2139 #endif 2140 2141 // Identify compatability class for VM's architecture and library's architecture 2142 // Obtain string descriptions for architectures 2143 2144 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 2145 int running_arch_index=-1; 2146 2147 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { 2148 if (running_arch_code == arch_array[i].code) { 2149 running_arch_index = i; 2150 } 2151 if (lib_arch.code == arch_array[i].code) { 2152 lib_arch.compat_class = arch_array[i].compat_class; 2153 lib_arch.name = arch_array[i].name; 2154 } 2155 } 2156 2157 assert(running_arch_index != -1, 2158 "Didn't find running architecture code (running_arch_code) in arch_array"); 2159 if (running_arch_index == -1) { 2160 // Even though running architecture detection failed 2161 // we may still continue with reporting dlerror() message 2162 return NULL; 2163 } 2164 2165 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 2166 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 2167 return NULL; 2168 } 2169 2170 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 2171 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 2172 return NULL; 2173 } 2174 2175 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 2176 if ( lib_arch.name!=NULL ) { 2177 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 2178 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 2179 lib_arch.name, arch_array[running_arch_index].name); 2180 } else { 2181 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 2182 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 2183 lib_arch.code, 2184 arch_array[running_arch_index].name); 2185 } 2186 } 2187 2188 return NULL; 2189} 2190 2191void* os::dll_lookup(void* handle, const char* name) { 2192 return dlsym(handle, name); 2193} 2194 2195int os::stat(const char *path, struct stat *sbuf) { 2196 char pathbuf[MAX_PATH]; 2197 if (strlen(path) > MAX_PATH - 1) { 2198 errno = ENAMETOOLONG; 2199 return -1; 2200 } 2201 os::native_path(strcpy(pathbuf, path)); 2202 return ::stat(pathbuf, sbuf); 2203} 2204 2205static bool _print_ascii_file(const char* filename, outputStream* st) { 2206 int fd = ::open(filename, O_RDONLY); 2207 if (fd == -1) { 2208 return false; 2209 } 2210 2211 char buf[32]; 2212 int bytes; 2213 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 2214 st->print_raw(buf, bytes); 2215 } 2216 2217 ::close(fd); 2218 2219 return true; 2220} 2221 2222void os::print_os_info_brief(outputStream* st) { 2223 os::Solaris::print_distro_info(st); 2224 2225 os::Posix::print_uname_info(st); 2226 2227 os::Solaris::print_libversion_info(st); 2228} 2229 2230void os::print_os_info(outputStream* st) { 2231 st->print("OS:"); 2232 2233 os::Solaris::print_distro_info(st); 2234 2235 os::Posix::print_uname_info(st); 2236 2237 os::Solaris::print_libversion_info(st); 2238 2239 os::Posix::print_rlimit_info(st); 2240 2241 os::Posix::print_load_average(st); 2242} 2243 2244void os::Solaris::print_distro_info(outputStream* st) { 2245 if (!_print_ascii_file("/etc/release", st)) { 2246 st->print("Solaris"); 2247 } 2248 st->cr(); 2249} 2250 2251void os::Solaris::print_libversion_info(outputStream* st) { 2252 if (os::Solaris::T2_libthread()) { 2253 st->print(" (T2 libthread)"); 2254 } 2255 else { 2256 st->print(" (T1 libthread)"); 2257 } 2258 st->cr(); 2259} 2260 2261static bool check_addr0(outputStream* st) { 2262 jboolean status = false; 2263 int fd = ::open("/proc/self/map",O_RDONLY); 2264 if (fd >= 0) { 2265 prmap_t p; 2266 while(::read(fd, &p, sizeof(p)) > 0) { 2267 if (p.pr_vaddr == 0x0) { 2268 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname); 2269 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname); 2270 st->print("Access:"); 2271 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-"); 2272 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-"); 2273 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-"); 2274 st->cr(); 2275 status = true; 2276 } 2277 ::close(fd); 2278 } 2279 } 2280 return status; 2281} 2282 2283void os::pd_print_cpu_info(outputStream* st) { 2284 // Nothing to do for now. 2285} 2286 2287void os::print_memory_info(outputStream* st) { 2288 st->print("Memory:"); 2289 st->print(" %dk page", os::vm_page_size()>>10); 2290 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 2291 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 2292 st->cr(); 2293 (void) check_addr0(st); 2294} 2295 2296// Taken from /usr/include/sys/machsig.h Supposed to be architecture specific 2297// but they're the same for all the solaris architectures that we support. 2298const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", 2299 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", 2300 "ILL_COPROC", "ILL_BADSTK" }; 2301 2302const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", 2303 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", 2304 "FPE_FLTINV", "FPE_FLTSUB" }; 2305 2306const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; 2307 2308const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; 2309 2310void os::print_siginfo(outputStream* st, void* siginfo) { 2311 st->print("siginfo:"); 2312 2313 const int buflen = 100; 2314 char buf[buflen]; 2315 siginfo_t *si = (siginfo_t*)siginfo; 2316 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); 2317 char *err = strerror(si->si_errno); 2318 if (si->si_errno != 0 && err != NULL) { 2319 st->print("si_errno=%s", err); 2320 } else { 2321 st->print("si_errno=%d", si->si_errno); 2322 } 2323 const int c = si->si_code; 2324 assert(c > 0, "unexpected si_code"); 2325 switch (si->si_signo) { 2326 case SIGILL: 2327 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); 2328 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2329 break; 2330 case SIGFPE: 2331 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); 2332 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2333 break; 2334 case SIGSEGV: 2335 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); 2336 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2337 break; 2338 case SIGBUS: 2339 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); 2340 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2341 break; 2342 default: 2343 st->print(", si_code=%d", si->si_code); 2344 // no si_addr 2345 } 2346 2347 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && 2348 UseSharedSpaces) { 2349 FileMapInfo* mapinfo = FileMapInfo::current_info(); 2350 if (mapinfo->is_in_shared_space(si->si_addr)) { 2351 st->print("\n\nError accessing class data sharing archive." \ 2352 " Mapped file inaccessible during execution, " \ 2353 " possible disk/network problem."); 2354 } 2355 } 2356 st->cr(); 2357} 2358 2359// Moved from whole group, because we need them here for diagnostic 2360// prints. 2361#define OLDMAXSIGNUM 32 2362static int Maxsignum = 0; 2363static int *ourSigFlags = NULL; 2364 2365extern "C" void sigINTRHandler(int, siginfo_t*, void*); 2366 2367int os::Solaris::get_our_sigflags(int sig) { 2368 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 2369 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 2370 return ourSigFlags[sig]; 2371} 2372 2373void os::Solaris::set_our_sigflags(int sig, int flags) { 2374 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 2375 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 2376 ourSigFlags[sig] = flags; 2377} 2378 2379 2380static const char* get_signal_handler_name(address handler, 2381 char* buf, int buflen) { 2382 int offset; 2383 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 2384 if (found) { 2385 // skip directory names 2386 const char *p1, *p2; 2387 p1 = buf; 2388 size_t len = strlen(os::file_separator()); 2389 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 2390 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 2391 } else { 2392 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 2393 } 2394 return buf; 2395} 2396 2397static void print_signal_handler(outputStream* st, int sig, 2398 char* buf, size_t buflen) { 2399 struct sigaction sa; 2400 2401 sigaction(sig, NULL, &sa); 2402 2403 st->print("%s: ", os::exception_name(sig, buf, buflen)); 2404 2405 address handler = (sa.sa_flags & SA_SIGINFO) 2406 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 2407 : CAST_FROM_FN_PTR(address, sa.sa_handler); 2408 2409 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 2410 st->print("SIG_DFL"); 2411 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 2412 st->print("SIG_IGN"); 2413 } else { 2414 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 2415 } 2416 2417 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); 2418 2419 address rh = VMError::get_resetted_sighandler(sig); 2420 // May be, handler was resetted by VMError? 2421 if(rh != NULL) { 2422 handler = rh; 2423 sa.sa_flags = VMError::get_resetted_sigflags(sig); 2424 } 2425 2426 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); 2427 2428 // Check: is it our handler? 2429 if(handler == CAST_FROM_FN_PTR(address, signalHandler) || 2430 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) { 2431 // It is our signal handler 2432 // check for flags 2433 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 2434 st->print( 2435 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 2436 os::Solaris::get_our_sigflags(sig)); 2437 } 2438 } 2439 st->cr(); 2440} 2441 2442void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 2443 st->print_cr("Signal Handlers:"); 2444 print_signal_handler(st, SIGSEGV, buf, buflen); 2445 print_signal_handler(st, SIGBUS , buf, buflen); 2446 print_signal_handler(st, SIGFPE , buf, buflen); 2447 print_signal_handler(st, SIGPIPE, buf, buflen); 2448 print_signal_handler(st, SIGXFSZ, buf, buflen); 2449 print_signal_handler(st, SIGILL , buf, buflen); 2450 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); 2451 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 2452 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 2453 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 2454 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 2455 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 2456 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen); 2457 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen); 2458} 2459 2460static char saved_jvm_path[MAXPATHLEN] = { 0 }; 2461 2462// Find the full path to the current module, libjvm.so 2463void os::jvm_path(char *buf, jint buflen) { 2464 // Error checking. 2465 if (buflen < MAXPATHLEN) { 2466 assert(false, "must use a large-enough buffer"); 2467 buf[0] = '\0'; 2468 return; 2469 } 2470 // Lazy resolve the path to current module. 2471 if (saved_jvm_path[0] != 0) { 2472 strcpy(buf, saved_jvm_path); 2473 return; 2474 } 2475 2476 Dl_info dlinfo; 2477 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 2478 assert(ret != 0, "cannot locate libjvm"); 2479 realpath((char *)dlinfo.dli_fname, buf); 2480 2481 if (Arguments::created_by_gamma_launcher()) { 2482 // Support for the gamma launcher. Typical value for buf is 2483 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at 2484 // the right place in the string, then assume we are installed in a JDK and 2485 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix 2486 // up the path so it looks like libjvm.so is installed there (append a 2487 // fake suffix hotspot/libjvm.so). 2488 const char *p = buf + strlen(buf) - 1; 2489 for (int count = 0; p > buf && count < 5; ++count) { 2490 for (--p; p > buf && *p != '/'; --p) 2491 /* empty */ ; 2492 } 2493 2494 if (strncmp(p, "/jre/lib/", 9) != 0) { 2495 // Look for JAVA_HOME in the environment. 2496 char* java_home_var = ::getenv("JAVA_HOME"); 2497 if (java_home_var != NULL && java_home_var[0] != 0) { 2498 char cpu_arch[12]; 2499 char* jrelib_p; 2500 int len; 2501 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 2502#ifdef _LP64 2503 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9. 2504 if (strcmp(cpu_arch, "sparc") == 0) { 2505 strcat(cpu_arch, "v9"); 2506 } else if (strcmp(cpu_arch, "i386") == 0) { 2507 strcpy(cpu_arch, "amd64"); 2508 } 2509#endif 2510 // Check the current module name "libjvm.so". 2511 p = strrchr(buf, '/'); 2512 assert(strstr(p, "/libjvm") == p, "invalid library name"); 2513 2514 realpath(java_home_var, buf); 2515 // determine if this is a legacy image or modules image 2516 // modules image doesn't have "jre" subdirectory 2517 len = strlen(buf); 2518 jrelib_p = buf + len; 2519 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); 2520 if (0 != access(buf, F_OK)) { 2521 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); 2522 } 2523 2524 if (0 == access(buf, F_OK)) { 2525 // Use current module name "libjvm.so" 2526 len = strlen(buf); 2527 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 2528 } else { 2529 // Go back to path of .so 2530 realpath((char *)dlinfo.dli_fname, buf); 2531 } 2532 } 2533 } 2534 } 2535 2536 strcpy(saved_jvm_path, buf); 2537} 2538 2539 2540void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2541 // no prefix required, not even "_" 2542} 2543 2544 2545void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2546 // no suffix required 2547} 2548 2549// This method is a copy of JDK's sysGetLastErrorString 2550// from src/solaris/hpi/src/system_md.c 2551 2552size_t os::lasterror(char *buf, size_t len) { 2553 2554 if (errno == 0) return 0; 2555 2556 const char *s = ::strerror(errno); 2557 size_t n = ::strlen(s); 2558 if (n >= len) { 2559 n = len - 1; 2560 } 2561 ::strncpy(buf, s, n); 2562 buf[n] = '\0'; 2563 return n; 2564} 2565 2566 2567// sun.misc.Signal 2568 2569extern "C" { 2570 static void UserHandler(int sig, void *siginfo, void *context) { 2571 // Ctrl-C is pressed during error reporting, likely because the error 2572 // handler fails to abort. Let VM die immediately. 2573 if (sig == SIGINT && is_error_reported()) { 2574 os::die(); 2575 } 2576 2577 os::signal_notify(sig); 2578 // We do not need to reinstate the signal handler each time... 2579 } 2580} 2581 2582void* os::user_handler() { 2583 return CAST_FROM_FN_PTR(void*, UserHandler); 2584} 2585 2586extern "C" { 2587 typedef void (*sa_handler_t)(int); 2588 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2589} 2590 2591void* os::signal(int signal_number, void* handler) { 2592 struct sigaction sigAct, oldSigAct; 2593 sigfillset(&(sigAct.sa_mask)); 2594 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 2595 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2596 2597 if (sigaction(signal_number, &sigAct, &oldSigAct)) 2598 // -1 means registration failed 2599 return (void *)-1; 2600 2601 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2602} 2603 2604void os::signal_raise(int signal_number) { 2605 raise(signal_number); 2606} 2607 2608/* 2609 * The following code is moved from os.cpp for making this 2610 * code platform specific, which it is by its very nature. 2611 */ 2612 2613// a counter for each possible signal value 2614static int Sigexit = 0; 2615static int Maxlibjsigsigs; 2616static jint *pending_signals = NULL; 2617static int *preinstalled_sigs = NULL; 2618static struct sigaction *chainedsigactions = NULL; 2619static sema_t sig_sem; 2620typedef int (*version_getting_t)(); 2621version_getting_t os::Solaris::get_libjsig_version = NULL; 2622static int libjsigversion = NULL; 2623 2624int os::sigexitnum_pd() { 2625 assert(Sigexit > 0, "signal memory not yet initialized"); 2626 return Sigexit; 2627} 2628 2629void os::Solaris::init_signal_mem() { 2630 // Initialize signal structures 2631 Maxsignum = SIGRTMAX; 2632 Sigexit = Maxsignum+1; 2633 assert(Maxsignum >0, "Unable to obtain max signal number"); 2634 2635 Maxlibjsigsigs = Maxsignum; 2636 2637 // pending_signals has one int per signal 2638 // The additional signal is for SIGEXIT - exit signal to signal_thread 2639 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal); 2640 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 2641 2642 if (UseSignalChaining) { 2643 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 2644 * (Maxsignum + 1), mtInternal); 2645 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 2646 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2647 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 2648 } 2649 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ), mtInternal); 2650 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 2651} 2652 2653void os::signal_init_pd() { 2654 int ret; 2655 2656 ret = ::sema_init(&sig_sem, 0, NULL, NULL); 2657 assert(ret == 0, "sema_init() failed"); 2658} 2659 2660void os::signal_notify(int signal_number) { 2661 int ret; 2662 2663 Atomic::inc(&pending_signals[signal_number]); 2664 ret = ::sema_post(&sig_sem); 2665 assert(ret == 0, "sema_post() failed"); 2666} 2667 2668static int check_pending_signals(bool wait_for_signal) { 2669 int ret; 2670 while (true) { 2671 for (int i = 0; i < Sigexit + 1; i++) { 2672 jint n = pending_signals[i]; 2673 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2674 return i; 2675 } 2676 } 2677 if (!wait_for_signal) { 2678 return -1; 2679 } 2680 JavaThread *thread = JavaThread::current(); 2681 ThreadBlockInVM tbivm(thread); 2682 2683 bool threadIsSuspended; 2684 do { 2685 thread->set_suspend_equivalent(); 2686 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2687 while((ret = ::sema_wait(&sig_sem)) == EINTR) 2688 ; 2689 assert(ret == 0, "sema_wait() failed"); 2690 2691 // were we externally suspended while we were waiting? 2692 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2693 if (threadIsSuspended) { 2694 // 2695 // The semaphore has been incremented, but while we were waiting 2696 // another thread suspended us. We don't want to continue running 2697 // while suspended because that would surprise the thread that 2698 // suspended us. 2699 // 2700 ret = ::sema_post(&sig_sem); 2701 assert(ret == 0, "sema_post() failed"); 2702 2703 thread->java_suspend_self(); 2704 } 2705 } while (threadIsSuspended); 2706 } 2707} 2708 2709int os::signal_lookup() { 2710 return check_pending_signals(false); 2711} 2712 2713int os::signal_wait() { 2714 return check_pending_signals(true); 2715} 2716 2717//////////////////////////////////////////////////////////////////////////////// 2718// Virtual Memory 2719 2720static int page_size = -1; 2721 2722// The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will 2723// clear this var if support is not available. 2724static bool has_map_align = true; 2725 2726int os::vm_page_size() { 2727 assert(page_size != -1, "must call os::init"); 2728 return page_size; 2729} 2730 2731// Solaris allocates memory by pages. 2732int os::vm_allocation_granularity() { 2733 assert(page_size != -1, "must call os::init"); 2734 return page_size; 2735} 2736 2737bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 2738 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2739 size_t size = bytes; 2740 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); 2741 if (res != NULL) { 2742 if (UseNUMAInterleaving) { 2743 numa_make_global(addr, bytes); 2744 } 2745 return true; 2746 } 2747 return false; 2748} 2749 2750bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint, 2751 bool exec) { 2752 if (commit_memory(addr, bytes, exec)) { 2753 if (UseMPSS && alignment_hint > (size_t)vm_page_size()) { 2754 // If the large page size has been set and the VM 2755 // is using large pages, use the large page size 2756 // if it is smaller than the alignment hint. This is 2757 // a case where the VM wants to use a larger alignment size 2758 // for its own reasons but still want to use large pages 2759 // (which is what matters to setting the mpss range. 2760 size_t page_size = 0; 2761 if (large_page_size() < alignment_hint) { 2762 assert(UseLargePages, "Expected to be here for large page use only"); 2763 page_size = large_page_size(); 2764 } else { 2765 // If the alignment hint is less than the large page 2766 // size, the VM wants a particular alignment (thus the hint) 2767 // for internal reasons. Try to set the mpss range using 2768 // the alignment_hint. 2769 page_size = alignment_hint; 2770 } 2771 // Since this is a hint, ignore any failures. 2772 (void)Solaris::set_mpss_range(addr, bytes, page_size); 2773 } 2774 return true; 2775 } 2776 return false; 2777} 2778 2779// Uncommit the pages in a specified region. 2780void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) { 2781 if (madvise(addr, bytes, MADV_FREE) < 0) { 2782 debug_only(warning("MADV_FREE failed.")); 2783 return; 2784 } 2785} 2786 2787bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2788 return os::commit_memory(addr, size); 2789} 2790 2791bool os::remove_stack_guard_pages(char* addr, size_t size) { 2792 return os::uncommit_memory(addr, size); 2793} 2794 2795// Change the page size in a given range. 2796void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2797 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2798 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2799 if (UseLargePages && UseMPSS) { 2800 Solaris::set_mpss_range(addr, bytes, alignment_hint); 2801 } 2802} 2803 2804// Tell the OS to make the range local to the first-touching LWP 2805void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2806 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2807 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2808 debug_only(warning("MADV_ACCESS_LWP failed.")); 2809 } 2810} 2811 2812// Tell the OS that this range would be accessed from different LWPs. 2813void os::numa_make_global(char *addr, size_t bytes) { 2814 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2815 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2816 debug_only(warning("MADV_ACCESS_MANY failed.")); 2817 } 2818} 2819 2820// Get the number of the locality groups. 2821size_t os::numa_get_groups_num() { 2822 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2823 return n != -1 ? n : 1; 2824} 2825 2826// Get a list of leaf locality groups. A leaf lgroup is group that 2827// doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2828// board. An LWP is assigned to one of these groups upon creation. 2829size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2830 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2831 ids[0] = 0; 2832 return 1; 2833 } 2834 int result_size = 0, top = 1, bottom = 0, cur = 0; 2835 for (int k = 0; k < size; k++) { 2836 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2837 (Solaris::lgrp_id_t*)&ids[top], size - top); 2838 if (r == -1) { 2839 ids[0] = 0; 2840 return 1; 2841 } 2842 if (!r) { 2843 // That's a leaf node. 2844 assert (bottom <= cur, "Sanity check"); 2845 // Check if the node has memory 2846 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], 2847 NULL, 0, LGRP_RSRC_MEM) > 0) { 2848 ids[bottom++] = ids[cur]; 2849 } 2850 } 2851 top += r; 2852 cur++; 2853 } 2854 if (bottom == 0) { 2855 // Handle a situation, when the OS reports no memory available. 2856 // Assume UMA architecture. 2857 ids[0] = 0; 2858 return 1; 2859 } 2860 return bottom; 2861} 2862 2863// Detect the topology change. Typically happens during CPU plugging-unplugging. 2864bool os::numa_topology_changed() { 2865 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2866 if (is_stale != -1 && is_stale) { 2867 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2868 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2869 assert(c != 0, "Failure to initialize LGRP API"); 2870 Solaris::set_lgrp_cookie(c); 2871 return true; 2872 } 2873 return false; 2874} 2875 2876// Get the group id of the current LWP. 2877int os::numa_get_group_id() { 2878 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); 2879 if (lgrp_id == -1) { 2880 return 0; 2881 } 2882 const int size = os::numa_get_groups_num(); 2883 int *ids = (int*)alloca(size * sizeof(int)); 2884 2885 // Get the ids of all lgroups with memory; r is the count. 2886 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, 2887 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); 2888 if (r <= 0) { 2889 return 0; 2890 } 2891 return ids[os::random() % r]; 2892} 2893 2894// Request information about the page. 2895bool os::get_page_info(char *start, page_info* info) { 2896 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2897 uint64_t addr = (uintptr_t)start; 2898 uint64_t outdata[2]; 2899 uint_t validity = 0; 2900 2901 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2902 return false; 2903 } 2904 2905 info->size = 0; 2906 info->lgrp_id = -1; 2907 2908 if ((validity & 1) != 0) { 2909 if ((validity & 2) != 0) { 2910 info->lgrp_id = outdata[0]; 2911 } 2912 if ((validity & 4) != 0) { 2913 info->size = outdata[1]; 2914 } 2915 return true; 2916 } 2917 return false; 2918} 2919 2920// Scan the pages from start to end until a page different than 2921// the one described in the info parameter is encountered. 2922char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2923 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2924 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 2925 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT]; 2926 uint_t validity[MAX_MEMINFO_CNT]; 2927 2928 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 2929 uint64_t p = (uint64_t)start; 2930 while (p < (uint64_t)end) { 2931 addrs[0] = p; 2932 size_t addrs_count = 1; 2933 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) { 2934 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 2935 addrs_count++; 2936 } 2937 2938 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 2939 return NULL; 2940 } 2941 2942 size_t i = 0; 2943 for (; i < addrs_count; i++) { 2944 if ((validity[i] & 1) != 0) { 2945 if ((validity[i] & 4) != 0) { 2946 if (outdata[types * i + 1] != page_expected->size) { 2947 break; 2948 } 2949 } else 2950 if (page_expected->size != 0) { 2951 break; 2952 } 2953 2954 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 2955 if (outdata[types * i] != page_expected->lgrp_id) { 2956 break; 2957 } 2958 } 2959 } else { 2960 return NULL; 2961 } 2962 } 2963 2964 if (i != addrs_count) { 2965 if ((validity[i] & 2) != 0) { 2966 page_found->lgrp_id = outdata[types * i]; 2967 } else { 2968 page_found->lgrp_id = -1; 2969 } 2970 if ((validity[i] & 4) != 0) { 2971 page_found->size = outdata[types * i + 1]; 2972 } else { 2973 page_found->size = 0; 2974 } 2975 return (char*)addrs[i]; 2976 } 2977 2978 p = addrs[addrs_count - 1] + page_size; 2979 } 2980 return end; 2981} 2982 2983bool os::pd_uncommit_memory(char* addr, size_t bytes) { 2984 size_t size = bytes; 2985 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2986 // uncommitted page. Otherwise, the read/write might succeed if we 2987 // have enough swap space to back the physical page. 2988 return 2989 NULL != Solaris::mmap_chunk(addr, size, 2990 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 2991 PROT_NONE); 2992} 2993 2994char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 2995 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 2996 2997 if (b == MAP_FAILED) { 2998 return NULL; 2999 } 3000 return b; 3001} 3002 3003char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) { 3004 char* addr = requested_addr; 3005 int flags = MAP_PRIVATE | MAP_NORESERVE; 3006 3007 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap"); 3008 3009 if (fixed) { 3010 flags |= MAP_FIXED; 3011 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) { 3012 flags |= MAP_ALIGN; 3013 addr = (char*) alignment_hint; 3014 } 3015 3016 // Map uncommitted pages PROT_NONE so we fail early if we touch an 3017 // uncommitted page. Otherwise, the read/write might succeed if we 3018 // have enough swap space to back the physical page. 3019 return mmap_chunk(addr, bytes, flags, PROT_NONE); 3020} 3021 3022char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) { 3023 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL)); 3024 3025 guarantee(requested_addr == NULL || requested_addr == addr, 3026 "OS failed to return requested mmap address."); 3027 return addr; 3028} 3029 3030// Reserve memory at an arbitrary address, only if that area is 3031// available (and not reserved for something else). 3032 3033char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3034 const int max_tries = 10; 3035 char* base[max_tries]; 3036 size_t size[max_tries]; 3037 3038 // Solaris adds a gap between mmap'ed regions. The size of the gap 3039 // is dependent on the requested size and the MMU. Our initial gap 3040 // value here is just a guess and will be corrected later. 3041 bool had_top_overlap = false; 3042 bool have_adjusted_gap = false; 3043 size_t gap = 0x400000; 3044 3045 // Assert only that the size is a multiple of the page size, since 3046 // that's all that mmap requires, and since that's all we really know 3047 // about at this low abstraction level. If we need higher alignment, 3048 // we can either pass an alignment to this method or verify alignment 3049 // in one of the methods further up the call chain. See bug 5044738. 3050 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 3051 3052 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 3053 // Give it a try, if the kernel honors the hint we can return immediately. 3054 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 3055 3056 volatile int err = errno; 3057 if (addr == requested_addr) { 3058 return addr; 3059 } else if (addr != NULL) { 3060 pd_unmap_memory(addr, bytes); 3061 } 3062 3063 if (PrintMiscellaneous && Verbose) { 3064 char buf[256]; 3065 buf[0] = '\0'; 3066 if (addr == NULL) { 3067 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err)); 3068 } 3069 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at " 3070 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT 3071 "%s", bytes, requested_addr, addr, buf); 3072 } 3073 3074 // Address hint method didn't work. Fall back to the old method. 3075 // In theory, once SNV becomes our oldest supported platform, this 3076 // code will no longer be needed. 3077 // 3078 // Repeatedly allocate blocks until the block is allocated at the 3079 // right spot. Give up after max_tries. 3080 int i; 3081 for (i = 0; i < max_tries; ++i) { 3082 base[i] = reserve_memory(bytes); 3083 3084 if (base[i] != NULL) { 3085 // Is this the block we wanted? 3086 if (base[i] == requested_addr) { 3087 size[i] = bytes; 3088 break; 3089 } 3090 3091 // check that the gap value is right 3092 if (had_top_overlap && !have_adjusted_gap) { 3093 size_t actual_gap = base[i-1] - base[i] - bytes; 3094 if (gap != actual_gap) { 3095 // adjust the gap value and retry the last 2 allocations 3096 assert(i > 0, "gap adjustment code problem"); 3097 have_adjusted_gap = true; // adjust the gap only once, just in case 3098 gap = actual_gap; 3099 if (PrintMiscellaneous && Verbose) { 3100 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap); 3101 } 3102 unmap_memory(base[i], bytes); 3103 unmap_memory(base[i-1], size[i-1]); 3104 i-=2; 3105 continue; 3106 } 3107 } 3108 3109 // Does this overlap the block we wanted? Give back the overlapped 3110 // parts and try again. 3111 // 3112 // There is still a bug in this code: if top_overlap == bytes, 3113 // the overlap is offset from requested region by the value of gap. 3114 // In this case giving back the overlapped part will not work, 3115 // because we'll give back the entire block at base[i] and 3116 // therefore the subsequent allocation will not generate a new gap. 3117 // This could be fixed with a new algorithm that used larger 3118 // or variable size chunks to find the requested region - 3119 // but such a change would introduce additional complications. 3120 // It's rare enough that the planets align for this bug, 3121 // so we'll just wait for a fix for 6204603/5003415 which 3122 // will provide a mmap flag to allow us to avoid this business. 3123 3124 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 3125 if (top_overlap >= 0 && top_overlap < bytes) { 3126 had_top_overlap = true; 3127 unmap_memory(base[i], top_overlap); 3128 base[i] += top_overlap; 3129 size[i] = bytes - top_overlap; 3130 } else { 3131 size_t bottom_overlap = base[i] + bytes - requested_addr; 3132 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 3133 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) { 3134 warning("attempt_reserve_memory_at: possible alignment bug"); 3135 } 3136 unmap_memory(requested_addr, bottom_overlap); 3137 size[i] = bytes - bottom_overlap; 3138 } else { 3139 size[i] = bytes; 3140 } 3141 } 3142 } 3143 } 3144 3145 // Give back the unused reserved pieces. 3146 3147 for (int j = 0; j < i; ++j) { 3148 if (base[j] != NULL) { 3149 unmap_memory(base[j], size[j]); 3150 } 3151 } 3152 3153 return (i < max_tries) ? requested_addr : NULL; 3154} 3155 3156bool os::pd_release_memory(char* addr, size_t bytes) { 3157 size_t size = bytes; 3158 return munmap(addr, size) == 0; 3159} 3160 3161static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 3162 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()), 3163 "addr must be page aligned"); 3164 int retVal = mprotect(addr, bytes, prot); 3165 return retVal == 0; 3166} 3167 3168// Protect memory (Used to pass readonly pages through 3169// JNI GetArray<type>Elements with empty arrays.) 3170// Also, used for serialization page and for compressed oops null pointer 3171// checking. 3172bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3173 bool is_committed) { 3174 unsigned int p = 0; 3175 switch (prot) { 3176 case MEM_PROT_NONE: p = PROT_NONE; break; 3177 case MEM_PROT_READ: p = PROT_READ; break; 3178 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 3179 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 3180 default: 3181 ShouldNotReachHere(); 3182 } 3183 // is_committed is unused. 3184 return solaris_mprotect(addr, bytes, p); 3185} 3186 3187// guard_memory and unguard_memory only happens within stack guard pages. 3188// Since ISM pertains only to the heap, guard and unguard memory should not 3189/// happen with an ISM region. 3190bool os::guard_memory(char* addr, size_t bytes) { 3191 return solaris_mprotect(addr, bytes, PROT_NONE); 3192} 3193 3194bool os::unguard_memory(char* addr, size_t bytes) { 3195 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); 3196} 3197 3198// Large page support 3199 3200// UseLargePages is the master flag to enable/disable large page memory. 3201// UseMPSS and UseISM are supported for compatibility reasons. Their combined 3202// effects can be described in the following table: 3203// 3204// UseLargePages UseMPSS UseISM 3205// false * * => UseLargePages is the master switch, turning 3206// it off will turn off both UseMPSS and 3207// UseISM. VM will not use large page memory 3208// regardless the settings of UseMPSS/UseISM. 3209// true false false => Unless future Solaris provides other 3210// mechanism to use large page memory, this 3211// combination is equivalent to -UseLargePages, 3212// VM will not use large page memory 3213// true true false => JVM will use MPSS for large page memory. 3214// This is the default behavior. 3215// true false true => JVM will use ISM for large page memory. 3216// true true true => JVM will use ISM if it is available. 3217// Otherwise, JVM will fall back to MPSS. 3218// Becaues ISM is now available on all 3219// supported Solaris versions, this combination 3220// is equivalent to +UseISM -UseMPSS. 3221 3222static size_t _large_page_size = 0; 3223 3224bool os::Solaris::ism_sanity_check(bool warn, size_t * page_size) { 3225 // x86 uses either 2M or 4M page, depending on whether PAE (Physical Address 3226 // Extensions) mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. Sparc 3227 // can support multiple page sizes. 3228 3229 // Don't bother to probe page size because getpagesizes() comes with MPSS. 3230 // ISM is only recommended on old Solaris where there is no MPSS support. 3231 // Simply choose a conservative value as default. 3232 *page_size = LargePageSizeInBytes ? LargePageSizeInBytes : 3233 SPARC_ONLY(4 * M) IA32_ONLY(4 * M) AMD64_ONLY(2 * M) 3234 ARM_ONLY(2 * M); 3235 3236 // ISM is available on all supported Solaris versions 3237 return true; 3238} 3239 3240// Insertion sort for small arrays (descending order). 3241static void insertion_sort_descending(size_t* array, int len) { 3242 for (int i = 0; i < len; i++) { 3243 size_t val = array[i]; 3244 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 3245 size_t tmp = array[key]; 3246 array[key] = array[key - 1]; 3247 array[key - 1] = tmp; 3248 } 3249 } 3250} 3251 3252bool os::Solaris::mpss_sanity_check(bool warn, size_t * page_size) { 3253 const unsigned int usable_count = VM_Version::page_size_count(); 3254 if (usable_count == 1) { 3255 return false; 3256 } 3257 3258 // Find the right getpagesizes interface. When solaris 11 is the minimum 3259 // build platform, getpagesizes() (without the '2') can be called directly. 3260 typedef int (*gps_t)(size_t[], int); 3261 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2")); 3262 if (gps_func == NULL) { 3263 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes")); 3264 if (gps_func == NULL) { 3265 if (warn) { 3266 warning("MPSS is not supported by the operating system."); 3267 } 3268 return false; 3269 } 3270 } 3271 3272 // Fill the array of page sizes. 3273 int n = (*gps_func)(_page_sizes, page_sizes_max); 3274 assert(n > 0, "Solaris bug?"); 3275 3276 if (n == page_sizes_max) { 3277 // Add a sentinel value (necessary only if the array was completely filled 3278 // since it is static (zeroed at initialization)). 3279 _page_sizes[--n] = 0; 3280 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 3281 } 3282 assert(_page_sizes[n] == 0, "missing sentinel"); 3283 trace_page_sizes("available page sizes", _page_sizes, n); 3284 3285 if (n == 1) return false; // Only one page size available. 3286 3287 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 3288 // select up to usable_count elements. First sort the array, find the first 3289 // acceptable value, then copy the usable sizes to the top of the array and 3290 // trim the rest. Make sure to include the default page size :-). 3291 // 3292 // A better policy could get rid of the 4M limit by taking the sizes of the 3293 // important VM memory regions (java heap and possibly the code cache) into 3294 // account. 3295 insertion_sort_descending(_page_sizes, n); 3296 const size_t size_limit = 3297 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 3298 int beg; 3299 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ; 3300 const int end = MIN2((int)usable_count, n) - 1; 3301 for (int cur = 0; cur < end; ++cur, ++beg) { 3302 _page_sizes[cur] = _page_sizes[beg]; 3303 } 3304 _page_sizes[end] = vm_page_size(); 3305 _page_sizes[end + 1] = 0; 3306 3307 if (_page_sizes[end] > _page_sizes[end - 1]) { 3308 // Default page size is not the smallest; sort again. 3309 insertion_sort_descending(_page_sizes, end + 1); 3310 } 3311 *page_size = _page_sizes[0]; 3312 3313 trace_page_sizes("usable page sizes", _page_sizes, end + 1); 3314 return true; 3315} 3316 3317void os::large_page_init() { 3318 if (!UseLargePages) { 3319 UseISM = false; 3320 UseMPSS = false; 3321 return; 3322 } 3323 3324 // print a warning if any large page related flag is specified on command line 3325 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 3326 !FLAG_IS_DEFAULT(UseISM) || 3327 !FLAG_IS_DEFAULT(UseMPSS) || 3328 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 3329 UseISM = UseISM && 3330 Solaris::ism_sanity_check(warn_on_failure, &_large_page_size); 3331 if (UseISM) { 3332 // ISM disables MPSS to be compatible with old JDK behavior 3333 UseMPSS = false; 3334 _page_sizes[0] = _large_page_size; 3335 _page_sizes[1] = vm_page_size(); 3336 } 3337 3338 UseMPSS = UseMPSS && 3339 Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 3340 3341 UseLargePages = UseISM || UseMPSS; 3342} 3343 3344bool os::Solaris::set_mpss_range(caddr_t start, size_t bytes, size_t align) { 3345 // Signal to OS that we want large pages for addresses 3346 // from addr, addr + bytes 3347 struct memcntl_mha mpss_struct; 3348 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 3349 mpss_struct.mha_pagesize = align; 3350 mpss_struct.mha_flags = 0; 3351 if (memcntl(start, bytes, MC_HAT_ADVISE, 3352 (caddr_t) &mpss_struct, 0, 0) < 0) { 3353 debug_only(warning("Attempt to use MPSS failed.")); 3354 return false; 3355 } 3356 return true; 3357} 3358 3359char* os::reserve_memory_special(size_t size, char* addr, bool exec) { 3360 // "exec" is passed in but not used. Creating the shared image for 3361 // the code cache doesn't have an SHM_X executable permission to check. 3362 assert(UseLargePages && UseISM, "only for ISM large pages"); 3363 3364 char* retAddr = NULL; 3365 int shmid; 3366 key_t ismKey; 3367 3368 bool warn_on_failure = UseISM && 3369 (!FLAG_IS_DEFAULT(UseLargePages) || 3370 !FLAG_IS_DEFAULT(UseISM) || 3371 !FLAG_IS_DEFAULT(LargePageSizeInBytes) 3372 ); 3373 char msg[128]; 3374 3375 ismKey = IPC_PRIVATE; 3376 3377 // Create a large shared memory region to attach to based on size. 3378 // Currently, size is the total size of the heap 3379 shmid = shmget(ismKey, size, SHM_R | SHM_W | IPC_CREAT); 3380 if (shmid == -1){ 3381 if (warn_on_failure) { 3382 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); 3383 warning(msg); 3384 } 3385 return NULL; 3386 } 3387 3388 // Attach to the region 3389 retAddr = (char *) shmat(shmid, 0, SHM_SHARE_MMU | SHM_R | SHM_W); 3390 int err = errno; 3391 3392 // Remove shmid. If shmat() is successful, the actual shared memory segment 3393 // will be deleted when it's detached by shmdt() or when the process 3394 // terminates. If shmat() is not successful this will remove the shared 3395 // segment immediately. 3396 shmctl(shmid, IPC_RMID, NULL); 3397 3398 if (retAddr == (char *) -1) { 3399 if (warn_on_failure) { 3400 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); 3401 warning(msg); 3402 } 3403 return NULL; 3404 } 3405 if ((retAddr != NULL) && UseNUMAInterleaving) { 3406 numa_make_global(retAddr, size); 3407 } 3408 3409 // The memory is committed 3410 address pc = CALLER_PC; 3411 MemTracker::record_virtual_memory_reserve((address)retAddr, size, pc); 3412 MemTracker::record_virtual_memory_commit((address)retAddr, size, pc); 3413 3414 return retAddr; 3415} 3416 3417bool os::release_memory_special(char* base, size_t bytes) { 3418 // detaching the SHM segment will also delete it, see reserve_memory_special() 3419 int rslt = shmdt(base); 3420 if (rslt == 0) { 3421 MemTracker::record_virtual_memory_uncommit((address)base, bytes); 3422 MemTracker::record_virtual_memory_release((address)base, bytes); 3423 return true; 3424 } else { 3425 return false; 3426 } 3427} 3428 3429size_t os::large_page_size() { 3430 return _large_page_size; 3431} 3432 3433// MPSS allows application to commit large page memory on demand; with ISM 3434// the entire memory region must be allocated as shared memory. 3435bool os::can_commit_large_page_memory() { 3436 return UseISM ? false : true; 3437} 3438 3439bool os::can_execute_large_page_memory() { 3440 return UseISM ? false : true; 3441} 3442 3443static int os_sleep(jlong millis, bool interruptible) { 3444 const jlong limit = INT_MAX; 3445 jlong prevtime; 3446 int res; 3447 3448 while (millis > limit) { 3449 if ((res = os_sleep(limit, interruptible)) != OS_OK) 3450 return res; 3451 millis -= limit; 3452 } 3453 3454 // Restart interrupted polls with new parameters until the proper delay 3455 // has been completed. 3456 3457 prevtime = getTimeMillis(); 3458 3459 while (millis > 0) { 3460 jlong newtime; 3461 3462 if (!interruptible) { 3463 // Following assert fails for os::yield_all: 3464 // assert(!thread->is_Java_thread(), "must not be java thread"); 3465 res = poll(NULL, 0, millis); 3466 } else { 3467 JavaThread *jt = JavaThread::current(); 3468 3469 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt, 3470 os::Solaris::clear_interrupted); 3471 } 3472 3473 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for 3474 // thread.Interrupt. 3475 3476 // See c/r 6751923. Poll can return 0 before time 3477 // has elapsed if time is set via clock_settime (as NTP does). 3478 // res == 0 if poll timed out (see man poll RETURN VALUES) 3479 // using the logic below checks that we really did 3480 // sleep at least "millis" if not we'll sleep again. 3481 if( ( res == 0 ) || ((res == OS_ERR) && (errno == EINTR))) { 3482 newtime = getTimeMillis(); 3483 assert(newtime >= prevtime, "time moving backwards"); 3484 /* Doing prevtime and newtime in microseconds doesn't help precision, 3485 and trying to round up to avoid lost milliseconds can result in a 3486 too-short delay. */ 3487 millis -= newtime - prevtime; 3488 if(millis <= 0) 3489 return OS_OK; 3490 prevtime = newtime; 3491 } else 3492 return res; 3493 } 3494 3495 return OS_OK; 3496} 3497 3498// Read calls from inside the vm need to perform state transitions 3499size_t os::read(int fd, void *buf, unsigned int nBytes) { 3500 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted); 3501} 3502 3503size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) { 3504 INTERRUPTIBLE_RETURN_INT(::read(fd, buf, nBytes), os::Solaris::clear_interrupted); 3505} 3506 3507int os::sleep(Thread* thread, jlong millis, bool interruptible) { 3508 assert(thread == Thread::current(), "thread consistency check"); 3509 3510 // TODO-FIXME: this should be removed. 3511 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock 3512 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate 3513 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving 3514 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel 3515 // is fooled into believing that the system is making progress. In the code below we block the 3516 // the watcher thread while safepoint is in progress so that it would not appear as though the 3517 // system is making progress. 3518 if (!Solaris::T2_libthread() && 3519 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) { 3520 // We now try to acquire the threads lock. Since this lock is held by the VM thread during 3521 // the entire safepoint, the watcher thread will line up here during the safepoint. 3522 Threads_lock->lock_without_safepoint_check(); 3523 Threads_lock->unlock(); 3524 } 3525 3526 if (thread->is_Java_thread()) { 3527 // This is a JavaThread so we honor the _thread_blocked protocol 3528 // even for sleeps of 0 milliseconds. This was originally done 3529 // as a workaround for bug 4338139. However, now we also do it 3530 // to honor the suspend-equivalent protocol. 3531 3532 JavaThread *jt = (JavaThread *) thread; 3533 ThreadBlockInVM tbivm(jt); 3534 3535 jt->set_suspend_equivalent(); 3536 // cleared by handle_special_suspend_equivalent_condition() or 3537 // java_suspend_self() via check_and_wait_while_suspended() 3538 3539 int ret_code; 3540 if (millis <= 0) { 3541 thr_yield(); 3542 ret_code = 0; 3543 } else { 3544 // The original sleep() implementation did not create an 3545 // OSThreadWaitState helper for sleeps of 0 milliseconds. 3546 // I'm preserving that decision for now. 3547 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); 3548 3549 ret_code = os_sleep(millis, interruptible); 3550 } 3551 3552 // were we externally suspended while we were waiting? 3553 jt->check_and_wait_while_suspended(); 3554 3555 return ret_code; 3556 } 3557 3558 // non-JavaThread from this point on: 3559 3560 if (millis <= 0) { 3561 thr_yield(); 3562 return 0; 3563 } 3564 3565 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 3566 3567 return os_sleep(millis, interruptible); 3568} 3569 3570int os::naked_sleep() { 3571 // %% make the sleep time an integer flag. for now use 1 millisec. 3572 return os_sleep(1, false); 3573} 3574 3575// Sleep forever; naked call to OS-specific sleep; use with CAUTION 3576void os::infinite_sleep() { 3577 while (true) { // sleep forever ... 3578 ::sleep(100); // ... 100 seconds at a time 3579 } 3580} 3581 3582// Used to convert frequent JVM_Yield() to nops 3583bool os::dont_yield() { 3584 if (DontYieldALot) { 3585 static hrtime_t last_time = 0; 3586 hrtime_t diff = getTimeNanos() - last_time; 3587 3588 if (diff < DontYieldALotInterval * 1000000) 3589 return true; 3590 3591 last_time += diff; 3592 3593 return false; 3594 } 3595 else { 3596 return false; 3597 } 3598} 3599 3600// Caveat: Solaris os::yield() causes a thread-state transition whereas 3601// the linux and win32 implementations do not. This should be checked. 3602 3603void os::yield() { 3604 // Yields to all threads with same or greater priority 3605 os::sleep(Thread::current(), 0, false); 3606} 3607 3608// Note that yield semantics are defined by the scheduling class to which 3609// the thread currently belongs. Typically, yield will _not yield to 3610// other equal or higher priority threads that reside on the dispatch queues 3611// of other CPUs. 3612 3613os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; } 3614 3615 3616// On Solaris we found that yield_all doesn't always yield to all other threads. 3617// There have been cases where there is a thread ready to execute but it doesn't 3618// get an lwp as the VM thread continues to spin with sleeps of 1 millisecond. 3619// The 1 millisecond wait doesn't seem long enough for the kernel to issue a 3620// SIGWAITING signal which will cause a new lwp to be created. So we count the 3621// number of times yield_all is called in the one loop and increase the sleep 3622// time after 8 attempts. If this fails too we increase the concurrency level 3623// so that the starving thread would get an lwp 3624 3625void os::yield_all(int attempts) { 3626 // Yields to all threads, including threads with lower priorities 3627 if (attempts == 0) { 3628 os::sleep(Thread::current(), 1, false); 3629 } else { 3630 int iterations = attempts % 30; 3631 if (iterations == 0 && !os::Solaris::T2_libthread()) { 3632 // thr_setconcurrency and _getconcurrency make sense only under T1. 3633 int noofLWPS = thr_getconcurrency(); 3634 if (noofLWPS < (Threads::number_of_threads() + 2)) { 3635 thr_setconcurrency(thr_getconcurrency() + 1); 3636 } 3637 } else if (iterations < 25) { 3638 os::sleep(Thread::current(), 1, false); 3639 } else { 3640 os::sleep(Thread::current(), 10, false); 3641 } 3642 } 3643} 3644 3645// Called from the tight loops to possibly influence time-sharing heuristics 3646void os::loop_breaker(int attempts) { 3647 os::yield_all(attempts); 3648} 3649 3650 3651// Interface for setting lwp priorities. If we are using T2 libthread, 3652// which forces the use of BoundThreads or we manually set UseBoundThreads, 3653// all of our threads will be assigned to real lwp's. Using the thr_setprio 3654// function is meaningless in this mode so we must adjust the real lwp's priority 3655// The routines below implement the getting and setting of lwp priorities. 3656// 3657// Note: There are three priority scales used on Solaris. Java priotities 3658// which range from 1 to 10, libthread "thr_setprio" scale which range 3659// from 0 to 127, and the current scheduling class of the process we 3660// are running in. This is typically from -60 to +60. 3661// The setting of the lwp priorities in done after a call to thr_setprio 3662// so Java priorities are mapped to libthread priorities and we map from 3663// the latter to lwp priorities. We don't keep priorities stored in 3664// Java priorities since some of our worker threads want to set priorities 3665// higher than all Java threads. 3666// 3667// For related information: 3668// (1) man -s 2 priocntl 3669// (2) man -s 4 priocntl 3670// (3) man dispadmin 3671// = librt.so 3672// = libthread/common/rtsched.c - thrp_setlwpprio(). 3673// = ps -cL <pid> ... to validate priority. 3674// = sched_get_priority_min and _max 3675// pthread_create 3676// sched_setparam 3677// pthread_setschedparam 3678// 3679// Assumptions: 3680// + We assume that all threads in the process belong to the same 3681// scheduling class. IE. an homogenous process. 3682// + Must be root or in IA group to change change "interactive" attribute. 3683// Priocntl() will fail silently. The only indication of failure is when 3684// we read-back the value and notice that it hasn't changed. 3685// + Interactive threads enter the runq at the head, non-interactive at the tail. 3686// + For RT, change timeslice as well. Invariant: 3687// constant "priority integral" 3688// Konst == TimeSlice * (60-Priority) 3689// Given a priority, compute appropriate timeslice. 3690// + Higher numerical values have higher priority. 3691 3692// sched class attributes 3693typedef struct { 3694 int schedPolicy; // classID 3695 int maxPrio; 3696 int minPrio; 3697} SchedInfo; 3698 3699 3700static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits; 3701 3702#ifdef ASSERT 3703static int ReadBackValidate = 1; 3704#endif 3705static int myClass = 0; 3706static int myMin = 0; 3707static int myMax = 0; 3708static int myCur = 0; 3709static bool priocntl_enable = false; 3710 3711static const int criticalPrio = 60; // FX/60 is critical thread class/priority on T4 3712static int java_MaxPriority_to_os_priority = 0; // Saved mapping 3713 3714// Call the version of priocntl suitable for all supported versions 3715// of Solaris. We need to call through this wrapper so that we can 3716// build on Solaris 9 and run on Solaris 8, 9 and 10. 3717// 3718// This code should be removed if we ever stop supporting Solaris 8 3719// and earlier releases. 3720 3721static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg); 3722typedef long (*priocntl_type)(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg); 3723static priocntl_type priocntl_ptr = priocntl_stub; 3724 3725// Stub to set the value of the real pointer, and then call the real 3726// function. 3727 3728static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg) { 3729 // Try Solaris 8- name only. 3730 priocntl_type tmp = (priocntl_type)dlsym(RTLD_DEFAULT, "__priocntl"); 3731 guarantee(tmp != NULL, "priocntl function not found."); 3732 priocntl_ptr = tmp; 3733 return (*priocntl_ptr)(PC_VERSION, idtype, id, cmd, arg); 3734} 3735 3736 3737// lwp_priocntl_init 3738// 3739// Try to determine the priority scale for our process. 3740// 3741// Return errno or 0 if OK. 3742// 3743static 3744int lwp_priocntl_init () 3745{ 3746 int rslt; 3747 pcinfo_t ClassInfo; 3748 pcparms_t ParmInfo; 3749 int i; 3750 3751 if (!UseThreadPriorities) return 0; 3752 3753 // We are using Bound threads, we need to determine our priority ranges 3754 if (os::Solaris::T2_libthread() || UseBoundThreads) { 3755 // If ThreadPriorityPolicy is 1, switch tables 3756 if (ThreadPriorityPolicy == 1) { 3757 for (i = 0 ; i < CriticalPriority+1; i++) 3758 os::java_to_os_priority[i] = prio_policy1[i]; 3759 } 3760 if (UseCriticalJavaThreadPriority) { 3761 // MaxPriority always maps to the FX scheduling class and criticalPrio. 3762 // See set_native_priority() and set_lwp_class_and_priority(). 3763 // Save original MaxPriority mapping in case attempt to 3764 // use critical priority fails. 3765 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority]; 3766 // Set negative to distinguish from other priorities 3767 os::java_to_os_priority[MaxPriority] = -criticalPrio; 3768 } 3769 } 3770 // Not using Bound Threads, set to ThreadPolicy 1 3771 else { 3772 for ( i = 0 ; i < CriticalPriority+1; i++ ) { 3773 os::java_to_os_priority[i] = prio_policy1[i]; 3774 } 3775 return 0; 3776 } 3777 3778 // Get IDs for a set of well-known scheduling classes. 3779 // TODO-FIXME: GETCLINFO returns the current # of classes in the 3780 // the system. We should have a loop that iterates over the 3781 // classID values, which are known to be "small" integers. 3782 3783 strcpy(ClassInfo.pc_clname, "TS"); 3784 ClassInfo.pc_cid = -1; 3785 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3786 if (rslt < 0) return errno; 3787 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 3788 tsLimits.schedPolicy = ClassInfo.pc_cid; 3789 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 3790 tsLimits.minPrio = -tsLimits.maxPrio; 3791 3792 strcpy(ClassInfo.pc_clname, "IA"); 3793 ClassInfo.pc_cid = -1; 3794 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3795 if (rslt < 0) return errno; 3796 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 3797 iaLimits.schedPolicy = ClassInfo.pc_cid; 3798 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 3799 iaLimits.minPrio = -iaLimits.maxPrio; 3800 3801 strcpy(ClassInfo.pc_clname, "RT"); 3802 ClassInfo.pc_cid = -1; 3803 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3804 if (rslt < 0) return errno; 3805 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 3806 rtLimits.schedPolicy = ClassInfo.pc_cid; 3807 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 3808 rtLimits.minPrio = 0; 3809 3810 strcpy(ClassInfo.pc_clname, "FX"); 3811 ClassInfo.pc_cid = -1; 3812 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3813 if (rslt < 0) return errno; 3814 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1"); 3815 fxLimits.schedPolicy = ClassInfo.pc_cid; 3816 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri; 3817 fxLimits.minPrio = 0; 3818 3819 // Query our "current" scheduling class. 3820 // This will normally be IA, TS or, rarely, FX or RT. 3821 memset(&ParmInfo, 0, sizeof(ParmInfo)); 3822 ParmInfo.pc_cid = PC_CLNULL; 3823 rslt = (*priocntl_ptr) (PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3824 if (rslt < 0) return errno; 3825 myClass = ParmInfo.pc_cid; 3826 3827 // We now know our scheduling classId, get specific information 3828 // about the class. 3829 ClassInfo.pc_cid = myClass; 3830 ClassInfo.pc_clname[0] = 0; 3831 rslt = (*priocntl_ptr) (PC_VERSION, (idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo); 3832 if (rslt < 0) return errno; 3833 3834 if (ThreadPriorityVerbose) { 3835 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 3836 } 3837 3838 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3839 ParmInfo.pc_cid = PC_CLNULL; 3840 rslt = (*priocntl_ptr)(PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3841 if (rslt < 0) return errno; 3842 3843 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3844 myMin = rtLimits.minPrio; 3845 myMax = rtLimits.maxPrio; 3846 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3847 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3848 myMin = iaLimits.minPrio; 3849 myMax = iaLimits.maxPrio; 3850 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 3851 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3852 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3853 myMin = tsLimits.minPrio; 3854 myMax = tsLimits.maxPrio; 3855 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 3856 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3857 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3858 myMin = fxLimits.minPrio; 3859 myMax = fxLimits.maxPrio; 3860 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict 3861 } else { 3862 // No clue - punt 3863 if (ThreadPriorityVerbose) 3864 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname); 3865 return EINVAL; // no clue, punt 3866 } 3867 3868 if (ThreadPriorityVerbose) { 3869 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax); 3870 } 3871 3872 priocntl_enable = true; // Enable changing priorities 3873 return 0; 3874} 3875 3876#define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 3877#define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 3878#define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 3879#define FXPRI(x) ((fxparms_t *)((x).pc_clparms)) 3880 3881 3882// scale_to_lwp_priority 3883// 3884// Convert from the libthread "thr_setprio" scale to our current 3885// lwp scheduling class scale. 3886// 3887static 3888int scale_to_lwp_priority (int rMin, int rMax, int x) 3889{ 3890 int v; 3891 3892 if (x == 127) return rMax; // avoid round-down 3893 v = (((x*(rMax-rMin)))/128)+rMin; 3894 return v; 3895} 3896 3897 3898// set_lwp_class_and_priority 3899// 3900// Set the class and priority of the lwp. This call should only 3901// be made when using bound threads (T2 threads are bound by default). 3902// 3903int set_lwp_class_and_priority(int ThreadID, int lwpid, 3904 int newPrio, int new_class, bool scale) { 3905 int rslt; 3906 int Actual, Expected, prv; 3907 pcparms_t ParmInfo; // for GET-SET 3908#ifdef ASSERT 3909 pcparms_t ReadBack; // for readback 3910#endif 3911 3912 // Set priority via PC_GETPARMS, update, PC_SETPARMS 3913 // Query current values. 3914 // TODO: accelerate this by eliminating the PC_GETPARMS call. 3915 // Cache "pcparms_t" in global ParmCache. 3916 // TODO: elide set-to-same-value 3917 3918 // If something went wrong on init, don't change priorities. 3919 if ( !priocntl_enable ) { 3920 if (ThreadPriorityVerbose) 3921 tty->print_cr("Trying to set priority but init failed, ignoring"); 3922 return EINVAL; 3923 } 3924 3925 // If lwp hasn't started yet, just return 3926 // the _start routine will call us again. 3927 if ( lwpid <= 0 ) { 3928 if (ThreadPriorityVerbose) { 3929 tty->print_cr ("deferring the set_lwp_class_and_priority of thread " 3930 INTPTR_FORMAT " to %d, lwpid not set", 3931 ThreadID, newPrio); 3932 } 3933 return 0; 3934 } 3935 3936 if (ThreadPriorityVerbose) { 3937 tty->print_cr ("set_lwp_class_and_priority(" 3938 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 3939 ThreadID, lwpid, newPrio); 3940 } 3941 3942 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3943 ParmInfo.pc_cid = PC_CLNULL; 3944 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 3945 if (rslt < 0) return errno; 3946 3947 int cur_class = ParmInfo.pc_cid; 3948 ParmInfo.pc_cid = (id_t)new_class; 3949 3950 if (new_class == rtLimits.schedPolicy) { 3951 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 3952 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio, 3953 rtLimits.maxPrio, newPrio) 3954 : newPrio; 3955 rtInfo->rt_tqsecs = RT_NOCHANGE; 3956 rtInfo->rt_tqnsecs = RT_NOCHANGE; 3957 if (ThreadPriorityVerbose) { 3958 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 3959 } 3960 } else if (new_class == iaLimits.schedPolicy) { 3961 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3962 int maxClamped = MIN2(iaLimits.maxPrio, 3963 cur_class == new_class 3964 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio); 3965 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio, 3966 maxClamped, newPrio) 3967 : newPrio; 3968 iaInfo->ia_uprilim = cur_class == new_class 3969 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio; 3970 iaInfo->ia_mode = IA_NOCHANGE; 3971 if (ThreadPriorityVerbose) { 3972 tty->print_cr("IA: [%d...%d] %d->%d\n", 3973 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 3974 } 3975 } else if (new_class == tsLimits.schedPolicy) { 3976 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3977 int maxClamped = MIN2(tsLimits.maxPrio, 3978 cur_class == new_class 3979 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio); 3980 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio, 3981 maxClamped, newPrio) 3982 : newPrio; 3983 tsInfo->ts_uprilim = cur_class == new_class 3984 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio; 3985 if (ThreadPriorityVerbose) { 3986 tty->print_cr("TS: [%d...%d] %d->%d\n", 3987 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 3988 } 3989 } else if (new_class == fxLimits.schedPolicy) { 3990 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3991 int maxClamped = MIN2(fxLimits.maxPrio, 3992 cur_class == new_class 3993 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio); 3994 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio, 3995 maxClamped, newPrio) 3996 : newPrio; 3997 fxInfo->fx_uprilim = cur_class == new_class 3998 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio; 3999 fxInfo->fx_tqsecs = FX_NOCHANGE; 4000 fxInfo->fx_tqnsecs = FX_NOCHANGE; 4001 if (ThreadPriorityVerbose) { 4002 tty->print_cr("FX: [%d...%d] %d->%d\n", 4003 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri); 4004 } 4005 } else { 4006 if (ThreadPriorityVerbose) { 4007 tty->print_cr("Unknown new scheduling class %d\n", new_class); 4008 } 4009 return EINVAL; // no clue, punt 4010 } 4011 4012 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 4013 if (ThreadPriorityVerbose && rslt) { 4014 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 4015 } 4016 if (rslt < 0) return errno; 4017 4018#ifdef ASSERT 4019 // Sanity check: read back what we just attempted to set. 4020 // In theory it could have changed in the interim ... 4021 // 4022 // The priocntl system call is tricky. 4023 // Sometimes it'll validate the priority value argument and 4024 // return EINVAL if unhappy. At other times it fails silently. 4025 // Readbacks are prudent. 4026 4027 if (!ReadBackValidate) return 0; 4028 4029 memset(&ReadBack, 0, sizeof(pcparms_t)); 4030 ReadBack.pc_cid = PC_CLNULL; 4031 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 4032 assert(rslt >= 0, "priocntl failed"); 4033 Actual = Expected = 0xBAD; 4034 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 4035 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 4036 Actual = RTPRI(ReadBack)->rt_pri; 4037 Expected = RTPRI(ParmInfo)->rt_pri; 4038 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 4039 Actual = IAPRI(ReadBack)->ia_upri; 4040 Expected = IAPRI(ParmInfo)->ia_upri; 4041 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 4042 Actual = TSPRI(ReadBack)->ts_upri; 4043 Expected = TSPRI(ParmInfo)->ts_upri; 4044 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 4045 Actual = FXPRI(ReadBack)->fx_upri; 4046 Expected = FXPRI(ParmInfo)->fx_upri; 4047 } else { 4048 if (ThreadPriorityVerbose) { 4049 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n", 4050 ParmInfo.pc_cid); 4051 } 4052 } 4053 4054 if (Actual != Expected) { 4055 if (ThreadPriorityVerbose) { 4056 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 4057 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 4058 } 4059 } 4060#endif 4061 4062 return 0; 4063} 4064 4065// Solaris only gives access to 128 real priorities at a time, 4066// so we expand Java's ten to fill this range. This would be better 4067// if we dynamically adjusted relative priorities. 4068// 4069// The ThreadPriorityPolicy option allows us to select 2 different 4070// priority scales. 4071// 4072// ThreadPriorityPolicy=0 4073// Since the Solaris' default priority is MaximumPriority, we do not 4074// set a priority lower than Max unless a priority lower than 4075// NormPriority is requested. 4076// 4077// ThreadPriorityPolicy=1 4078// This mode causes the priority table to get filled with 4079// linear values. NormPriority get's mapped to 50% of the 4080// Maximum priority an so on. This will cause VM threads 4081// to get unfair treatment against other Solaris processes 4082// which do not explicitly alter their thread priorities. 4083// 4084 4085int os::java_to_os_priority[CriticalPriority + 1] = { 4086 -99999, // 0 Entry should never be used 4087 4088 0, // 1 MinPriority 4089 32, // 2 4090 64, // 3 4091 4092 96, // 4 4093 127, // 5 NormPriority 4094 127, // 6 4095 4096 127, // 7 4097 127, // 8 4098 127, // 9 NearMaxPriority 4099 4100 127, // 10 MaxPriority 4101 4102 -criticalPrio // 11 CriticalPriority 4103}; 4104 4105OSReturn os::set_native_priority(Thread* thread, int newpri) { 4106 OSThread* osthread = thread->osthread(); 4107 4108 // Save requested priority in case the thread hasn't been started 4109 osthread->set_native_priority(newpri); 4110 4111 // Check for critical priority request 4112 bool fxcritical = false; 4113 if (newpri == -criticalPrio) { 4114 fxcritical = true; 4115 newpri = criticalPrio; 4116 } 4117 4118 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 4119 if (!UseThreadPriorities) return OS_OK; 4120 4121 int status = 0; 4122 4123 if (!fxcritical) { 4124 // Use thr_setprio only if we have a priority that thr_setprio understands 4125 status = thr_setprio(thread->osthread()->thread_id(), newpri); 4126 } 4127 4128 if (os::Solaris::T2_libthread() || 4129 (UseBoundThreads && osthread->is_vm_created())) { 4130 int lwp_status = 4131 set_lwp_class_and_priority(osthread->thread_id(), 4132 osthread->lwp_id(), 4133 newpri, 4134 fxcritical ? fxLimits.schedPolicy : myClass, 4135 !fxcritical); 4136 if (lwp_status != 0 && fxcritical) { 4137 // Try again, this time without changing the scheduling class 4138 newpri = java_MaxPriority_to_os_priority; 4139 lwp_status = set_lwp_class_and_priority(osthread->thread_id(), 4140 osthread->lwp_id(), 4141 newpri, myClass, false); 4142 } 4143 status |= lwp_status; 4144 } 4145 return (status == 0) ? OS_OK : OS_ERR; 4146} 4147 4148 4149OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 4150 int p; 4151 if ( !UseThreadPriorities ) { 4152 *priority_ptr = NormalPriority; 4153 return OS_OK; 4154 } 4155 int status = thr_getprio(thread->osthread()->thread_id(), &p); 4156 if (status != 0) { 4157 return OS_ERR; 4158 } 4159 *priority_ptr = p; 4160 return OS_OK; 4161} 4162 4163 4164// Hint to the underlying OS that a task switch would not be good. 4165// Void return because it's a hint and can fail. 4166void os::hint_no_preempt() { 4167 schedctl_start(schedctl_init()); 4168} 4169 4170void os::interrupt(Thread* thread) { 4171 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer"); 4172 4173 OSThread* osthread = thread->osthread(); 4174 4175 int isInterrupted = osthread->interrupted(); 4176 if (!isInterrupted) { 4177 osthread->set_interrupted(true); 4178 OrderAccess::fence(); 4179 // os::sleep() is implemented with either poll (NULL,0,timeout) or 4180 // by parking on _SleepEvent. If the former, thr_kill will unwedge 4181 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper. 4182 ParkEvent * const slp = thread->_SleepEvent ; 4183 if (slp != NULL) slp->unpark() ; 4184 } 4185 4186 // For JSR166: unpark after setting status but before thr_kill -dl 4187 if (thread->is_Java_thread()) { 4188 ((JavaThread*)thread)->parker()->unpark(); 4189 } 4190 4191 // Handle interruptible wait() ... 4192 ParkEvent * const ev = thread->_ParkEvent ; 4193 if (ev != NULL) ev->unpark() ; 4194 4195 // When events are used everywhere for os::sleep, then this thr_kill 4196 // will only be needed if UseVMInterruptibleIO is true. 4197 4198 if (!isInterrupted) { 4199 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt()); 4200 assert_status(status == 0, status, "thr_kill"); 4201 4202 // Bump thread interruption counter 4203 RuntimeService::record_thread_interrupt_signaled_count(); 4204 } 4205} 4206 4207 4208bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 4209 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer"); 4210 4211 OSThread* osthread = thread->osthread(); 4212 4213 bool res = osthread->interrupted(); 4214 4215 // NOTE that since there is no "lock" around these two operations, 4216 // there is the possibility that the interrupted flag will be 4217 // "false" but that the interrupt event will be set. This is 4218 // intentional. The effect of this is that Object.wait() will appear 4219 // to have a spurious wakeup, which is not harmful, and the 4220 // possibility is so rare that it is not worth the added complexity 4221 // to add yet another lock. It has also been recommended not to put 4222 // the interrupted flag into the os::Solaris::Event structure, 4223 // because it hides the issue. 4224 if (res && clear_interrupted) { 4225 osthread->set_interrupted(false); 4226 } 4227 return res; 4228} 4229 4230 4231void os::print_statistics() { 4232} 4233 4234int os::message_box(const char* title, const char* message) { 4235 int i; 4236 fdStream err(defaultStream::error_fd()); 4237 for (i = 0; i < 78; i++) err.print_raw("="); 4238 err.cr(); 4239 err.print_raw_cr(title); 4240 for (i = 0; i < 78; i++) err.print_raw("-"); 4241 err.cr(); 4242 err.print_raw_cr(message); 4243 for (i = 0; i < 78; i++) err.print_raw("="); 4244 err.cr(); 4245 4246 char buf[16]; 4247 // Prevent process from exiting upon "read error" without consuming all CPU 4248 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 4249 4250 return buf[0] == 'y' || buf[0] == 'Y'; 4251} 4252 4253// A lightweight implementation that does not suspend the target thread and 4254// thus returns only a hint. Used for profiling only! 4255ExtendedPC os::get_thread_pc(Thread* thread) { 4256 // Make sure that it is called by the watcher and the Threads lock is owned. 4257 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock"); 4258 // For now, is only used to profile the VM Thread 4259 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 4260 ExtendedPC epc; 4261 4262 GetThreadPC_Callback cb(ProfileVM_lock); 4263 OSThread *osthread = thread->osthread(); 4264 const int time_to_wait = 400; // 400ms wait for initial response 4265 int status = cb.interrupt(thread, time_to_wait); 4266 4267 if (cb.is_done() ) { 4268 epc = cb.addr(); 4269 } else { 4270 DEBUG_ONLY(tty->print_cr("Failed to get pc for thread: %d got %d status", 4271 osthread->thread_id(), status);); 4272 // epc is already NULL 4273 } 4274 return epc; 4275} 4276 4277 4278// This does not do anything on Solaris. This is basically a hook for being 4279// able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 4280void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) { 4281 f(value, method, args, thread); 4282} 4283 4284// This routine may be used by user applications as a "hook" to catch signals. 4285// The user-defined signal handler must pass unrecognized signals to this 4286// routine, and if it returns true (non-zero), then the signal handler must 4287// return immediately. If the flag "abort_if_unrecognized" is true, then this 4288// routine will never retun false (zero), but instead will execute a VM panic 4289// routine kill the process. 4290// 4291// If this routine returns false, it is OK to call it again. This allows 4292// the user-defined signal handler to perform checks either before or after 4293// the VM performs its own checks. Naturally, the user code would be making 4294// a serious error if it tried to handle an exception (such as a null check 4295// or breakpoint) that the VM was generating for its own correct operation. 4296// 4297// This routine may recognize any of the following kinds of signals: 4298// SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 4299// os::Solaris::SIGasync 4300// It should be consulted by handlers for any of those signals. 4301// It explicitly does not recognize os::Solaris::SIGinterrupt 4302// 4303// The caller of this routine must pass in the three arguments supplied 4304// to the function referred to in the "sa_sigaction" (not the "sa_handler") 4305// field of the structure passed to sigaction(). This routine assumes that 4306// the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 4307// 4308// Note that the VM will print warnings if it detects conflicting signal 4309// handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 4310// 4311extern "C" JNIEXPORT int 4312JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, 4313 int abort_if_unrecognized); 4314 4315 4316void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 4317 int orig_errno = errno; // Preserve errno value over signal handler. 4318 JVM_handle_solaris_signal(sig, info, ucVoid, true); 4319 errno = orig_errno; 4320} 4321 4322/* Do not delete - if guarantee is ever removed, a signal handler (even empty) 4323 is needed to provoke threads blocked on IO to return an EINTR 4324 Note: this explicitly does NOT call JVM_handle_solaris_signal and 4325 does NOT participate in signal chaining due to requirement for 4326 NOT setting SA_RESTART to make EINTR work. */ 4327extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) { 4328 if (UseSignalChaining) { 4329 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig); 4330 if (actp && actp->sa_handler) { 4331 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs"); 4332 } 4333 } 4334} 4335 4336// This boolean allows users to forward their own non-matching signals 4337// to JVM_handle_solaris_signal, harmlessly. 4338bool os::Solaris::signal_handlers_are_installed = false; 4339 4340// For signal-chaining 4341bool os::Solaris::libjsig_is_loaded = false; 4342typedef struct sigaction *(*get_signal_t)(int); 4343get_signal_t os::Solaris::get_signal_action = NULL; 4344 4345struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 4346 struct sigaction *actp = NULL; 4347 4348 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) { 4349 // Retrieve the old signal handler from libjsig 4350 actp = (*get_signal_action)(sig); 4351 } 4352 if (actp == NULL) { 4353 // Retrieve the preinstalled signal handler from jvm 4354 actp = get_preinstalled_handler(sig); 4355 } 4356 4357 return actp; 4358} 4359 4360static bool call_chained_handler(struct sigaction *actp, int sig, 4361 siginfo_t *siginfo, void *context) { 4362 // Call the old signal handler 4363 if (actp->sa_handler == SIG_DFL) { 4364 // It's more reasonable to let jvm treat it as an unexpected exception 4365 // instead of taking the default action. 4366 return false; 4367 } else if (actp->sa_handler != SIG_IGN) { 4368 if ((actp->sa_flags & SA_NODEFER) == 0) { 4369 // automaticlly block the signal 4370 sigaddset(&(actp->sa_mask), sig); 4371 } 4372 4373 sa_handler_t hand; 4374 sa_sigaction_t sa; 4375 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 4376 // retrieve the chained handler 4377 if (siginfo_flag_set) { 4378 sa = actp->sa_sigaction; 4379 } else { 4380 hand = actp->sa_handler; 4381 } 4382 4383 if ((actp->sa_flags & SA_RESETHAND) != 0) { 4384 actp->sa_handler = SIG_DFL; 4385 } 4386 4387 // try to honor the signal mask 4388 sigset_t oset; 4389 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset); 4390 4391 // call into the chained handler 4392 if (siginfo_flag_set) { 4393 (*sa)(sig, siginfo, context); 4394 } else { 4395 (*hand)(sig); 4396 } 4397 4398 // restore the signal mask 4399 thr_sigsetmask(SIG_SETMASK, &oset, 0); 4400 } 4401 // Tell jvm's signal handler the signal is taken care of. 4402 return true; 4403} 4404 4405bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 4406 bool chained = false; 4407 // signal-chaining 4408 if (UseSignalChaining) { 4409 struct sigaction *actp = get_chained_signal_action(sig); 4410 if (actp != NULL) { 4411 chained = call_chained_handler(actp, sig, siginfo, context); 4412 } 4413 } 4414 return chained; 4415} 4416 4417struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 4418 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized"); 4419 if (preinstalled_sigs[sig] != 0) { 4420 return &chainedsigactions[sig]; 4421 } 4422 return NULL; 4423} 4424 4425void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 4426 4427 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 4428 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized"); 4429 chainedsigactions[sig] = oldAct; 4430 preinstalled_sigs[sig] = 1; 4431} 4432 4433void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) { 4434 // Check for overwrite. 4435 struct sigaction oldAct; 4436 sigaction(sig, (struct sigaction*)NULL, &oldAct); 4437 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4438 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4439 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 4440 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 4441 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 4442 if (AllowUserSignalHandlers || !set_installed) { 4443 // Do not overwrite; user takes responsibility to forward to us. 4444 return; 4445 } else if (UseSignalChaining) { 4446 if (oktochain) { 4447 // save the old handler in jvm 4448 save_preinstalled_handler(sig, oldAct); 4449 } else { 4450 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs."); 4451 } 4452 // libjsig also interposes the sigaction() call below and saves the 4453 // old sigaction on it own. 4454 } else { 4455 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " 4456 "%#lx for signal %d.", (long)oldhand, sig)); 4457 } 4458 } 4459 4460 struct sigaction sigAct; 4461 sigfillset(&(sigAct.sa_mask)); 4462 sigAct.sa_handler = SIG_DFL; 4463 4464 sigAct.sa_sigaction = signalHandler; 4465 // Handle SIGSEGV on alternate signal stack if 4466 // not using stack banging 4467 if (!UseStackBanging && sig == SIGSEGV) { 4468 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 4469 // Interruptible i/o requires SA_RESTART cleared so EINTR 4470 // is returned instead of restarting system calls 4471 } else if (sig == os::Solaris::SIGinterrupt()) { 4472 sigemptyset(&sigAct.sa_mask); 4473 sigAct.sa_handler = NULL; 4474 sigAct.sa_flags = SA_SIGINFO; 4475 sigAct.sa_sigaction = sigINTRHandler; 4476 } else { 4477 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 4478 } 4479 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 4480 4481 sigaction(sig, &sigAct, &oldAct); 4482 4483 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4484 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4485 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 4486} 4487 4488 4489#define DO_SIGNAL_CHECK(sig) \ 4490 if (!sigismember(&check_signal_done, sig)) \ 4491 os::Solaris::check_signal_handler(sig) 4492 4493// This method is a periodic task to check for misbehaving JNI applications 4494// under CheckJNI, we can add any periodic checks here 4495 4496void os::run_periodic_checks() { 4497 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 4498 // thereby preventing a NULL checks. 4499 if(!check_addr0_done) check_addr0_done = check_addr0(tty); 4500 4501 if (check_signals == false) return; 4502 4503 // SEGV and BUS if overridden could potentially prevent 4504 // generation of hs*.log in the event of a crash, debugging 4505 // such a case can be very challenging, so we absolutely 4506 // check for the following for a good measure: 4507 DO_SIGNAL_CHECK(SIGSEGV); 4508 DO_SIGNAL_CHECK(SIGILL); 4509 DO_SIGNAL_CHECK(SIGFPE); 4510 DO_SIGNAL_CHECK(SIGBUS); 4511 DO_SIGNAL_CHECK(SIGPIPE); 4512 DO_SIGNAL_CHECK(SIGXFSZ); 4513 4514 // ReduceSignalUsage allows the user to override these handlers 4515 // see comments at the very top and jvm_solaris.h 4516 if (!ReduceSignalUsage) { 4517 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 4518 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 4519 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 4520 DO_SIGNAL_CHECK(BREAK_SIGNAL); 4521 } 4522 4523 // See comments above for using JVM1/JVM2 and UseAltSigs 4524 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt()); 4525 DO_SIGNAL_CHECK(os::Solaris::SIGasync()); 4526 4527} 4528 4529typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 4530 4531static os_sigaction_t os_sigaction = NULL; 4532 4533void os::Solaris::check_signal_handler(int sig) { 4534 char buf[O_BUFLEN]; 4535 address jvmHandler = NULL; 4536 4537 struct sigaction act; 4538 if (os_sigaction == NULL) { 4539 // only trust the default sigaction, in case it has been interposed 4540 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 4541 if (os_sigaction == NULL) return; 4542 } 4543 4544 os_sigaction(sig, (struct sigaction*)NULL, &act); 4545 4546 address thisHandler = (act.sa_flags & SA_SIGINFO) 4547 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 4548 : CAST_FROM_FN_PTR(address, act.sa_handler) ; 4549 4550 4551 switch(sig) { 4552 case SIGSEGV: 4553 case SIGBUS: 4554 case SIGFPE: 4555 case SIGPIPE: 4556 case SIGXFSZ: 4557 case SIGILL: 4558 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4559 break; 4560 4561 case SHUTDOWN1_SIGNAL: 4562 case SHUTDOWN2_SIGNAL: 4563 case SHUTDOWN3_SIGNAL: 4564 case BREAK_SIGNAL: 4565 jvmHandler = (address)user_handler(); 4566 break; 4567 4568 default: 4569 int intrsig = os::Solaris::SIGinterrupt(); 4570 int asynsig = os::Solaris::SIGasync(); 4571 4572 if (sig == intrsig) { 4573 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler); 4574 } else if (sig == asynsig) { 4575 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4576 } else { 4577 return; 4578 } 4579 break; 4580 } 4581 4582 4583 if (thisHandler != jvmHandler) { 4584 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 4585 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 4586 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 4587 // No need to check this sig any longer 4588 sigaddset(&check_signal_done, sig); 4589 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 4590 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 4591 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig)); 4592 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); 4593 // No need to check this sig any longer 4594 sigaddset(&check_signal_done, sig); 4595 } 4596 4597 // Print all the signal handler state 4598 if (sigismember(&check_signal_done, sig)) { 4599 print_signal_handlers(tty, buf, O_BUFLEN); 4600 } 4601 4602} 4603 4604void os::Solaris::install_signal_handlers() { 4605 bool libjsigdone = false; 4606 signal_handlers_are_installed = true; 4607 4608 // signal-chaining 4609 typedef void (*signal_setting_t)(); 4610 signal_setting_t begin_signal_setting = NULL; 4611 signal_setting_t end_signal_setting = NULL; 4612 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4613 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 4614 if (begin_signal_setting != NULL) { 4615 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4616 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 4617 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 4618 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 4619 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t, 4620 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version")); 4621 libjsig_is_loaded = true; 4622 if (os::Solaris::get_libjsig_version != NULL) { 4623 libjsigversion = (*os::Solaris::get_libjsig_version)(); 4624 } 4625 assert(UseSignalChaining, "should enable signal-chaining"); 4626 } 4627 if (libjsig_is_loaded) { 4628 // Tell libjsig jvm is setting signal handlers 4629 (*begin_signal_setting)(); 4630 } 4631 4632 set_signal_handler(SIGSEGV, true, true); 4633 set_signal_handler(SIGPIPE, true, true); 4634 set_signal_handler(SIGXFSZ, true, true); 4635 set_signal_handler(SIGBUS, true, true); 4636 set_signal_handler(SIGILL, true, true); 4637 set_signal_handler(SIGFPE, true, true); 4638 4639 4640 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) { 4641 4642 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so 4643 // can not register overridable signals which might be > 32 4644 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) { 4645 // Tell libjsig jvm has finished setting signal handlers 4646 (*end_signal_setting)(); 4647 libjsigdone = true; 4648 } 4649 } 4650 4651 // Never ok to chain our SIGinterrupt 4652 set_signal_handler(os::Solaris::SIGinterrupt(), true, false); 4653 set_signal_handler(os::Solaris::SIGasync(), true, true); 4654 4655 if (libjsig_is_loaded && !libjsigdone) { 4656 // Tell libjsig jvm finishes setting signal handlers 4657 (*end_signal_setting)(); 4658 } 4659 4660 // We don't activate signal checker if libjsig is in place, we trust ourselves 4661 // and if UserSignalHandler is installed all bets are off. 4662 // Log that signal checking is off only if -verbose:jni is specified. 4663 if (CheckJNICalls) { 4664 if (libjsig_is_loaded) { 4665 if (PrintJNIResolving) { 4666 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 4667 } 4668 check_signals = false; 4669 } 4670 if (AllowUserSignalHandlers) { 4671 if (PrintJNIResolving) { 4672 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 4673 } 4674 check_signals = false; 4675 } 4676 } 4677} 4678 4679 4680void report_error(const char* file_name, int line_no, const char* title, const char* format, ...); 4681 4682const char * signames[] = { 4683 "SIG0", 4684 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP", 4685 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS", 4686 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM", 4687 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH", 4688 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT", 4689 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU", 4690 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW", 4691 "SIGCANCEL", "SIGLOST" 4692}; 4693 4694const char* os::exception_name(int exception_code, char* buf, size_t size) { 4695 if (0 < exception_code && exception_code <= SIGRTMAX) { 4696 // signal 4697 if (exception_code < sizeof(signames)/sizeof(const char*)) { 4698 jio_snprintf(buf, size, "%s", signames[exception_code]); 4699 } else { 4700 jio_snprintf(buf, size, "SIG%d", exception_code); 4701 } 4702 return buf; 4703 } else { 4704 return NULL; 4705 } 4706} 4707 4708// (Static) wrappers for the new libthread API 4709int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate; 4710int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate; 4711int_fnP_thread_t_i os::Solaris::_thr_setmutator; 4712int_fnP_thread_t os::Solaris::_thr_suspend_mutator; 4713int_fnP_thread_t os::Solaris::_thr_continue_mutator; 4714 4715// (Static) wrapper for getisax(2) call. 4716os::Solaris::getisax_func_t os::Solaris::_getisax = 0; 4717 4718// (Static) wrappers for the liblgrp API 4719os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 4720os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 4721os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 4722os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 4723os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 4724os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; 4725os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 4726os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 4727os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 4728 4729// (Static) wrapper for meminfo() call. 4730os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0; 4731 4732static address resolve_symbol_lazy(const char* name) { 4733 address addr = (address) dlsym(RTLD_DEFAULT, name); 4734 if(addr == NULL) { 4735 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 4736 addr = (address) dlsym(RTLD_NEXT, name); 4737 } 4738 return addr; 4739} 4740 4741static address resolve_symbol(const char* name) { 4742 address addr = resolve_symbol_lazy(name); 4743 if(addr == NULL) { 4744 fatal(dlerror()); 4745 } 4746 return addr; 4747} 4748 4749 4750 4751// isT2_libthread() 4752// 4753// Routine to determine if we are currently using the new T2 libthread. 4754// 4755// We determine if we are using T2 by reading /proc/self/lstatus and 4756// looking for a thread with the ASLWP bit set. If we find this status 4757// bit set, we must assume that we are NOT using T2. The T2 team 4758// has approved this algorithm. 4759// 4760// We need to determine if we are running with the new T2 libthread 4761// since setting native thread priorities is handled differently 4762// when using this library. All threads created using T2 are bound 4763// threads. Calling thr_setprio is meaningless in this case. 4764// 4765bool isT2_libthread() { 4766 static prheader_t * lwpArray = NULL; 4767 static int lwpSize = 0; 4768 static int lwpFile = -1; 4769 lwpstatus_t * that; 4770 char lwpName [128]; 4771 bool isT2 = false; 4772 4773#define ADR(x) ((uintptr_t)(x)) 4774#define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1)))) 4775 4776 lwpFile = ::open("/proc/self/lstatus", O_RDONLY, 0); 4777 if (lwpFile < 0) { 4778 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n"); 4779 return false; 4780 } 4781 lwpSize = 16*1024; 4782 for (;;) { 4783 ::lseek64 (lwpFile, 0, SEEK_SET); 4784 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize, mtInternal); 4785 if (::read(lwpFile, lwpArray, lwpSize) < 0) { 4786 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n"); 4787 break; 4788 } 4789 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) { 4790 // We got a good snapshot - now iterate over the list. 4791 int aslwpcount = 0; 4792 for (int i = 0; i < lwpArray->pr_nent; i++ ) { 4793 that = LWPINDEX(lwpArray,i); 4794 if (that->pr_flags & PR_ASLWP) { 4795 aslwpcount++; 4796 } 4797 } 4798 if (aslwpcount == 0) isT2 = true; 4799 break; 4800 } 4801 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize; 4802 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal); // retry. 4803 } 4804 4805 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal); 4806 ::close (lwpFile); 4807 if (ThreadPriorityVerbose) { 4808 if (isT2) tty->print_cr("We are running with a T2 libthread\n"); 4809 else tty->print_cr("We are not running with a T2 libthread\n"); 4810 } 4811 return isT2; 4812} 4813 4814 4815void os::Solaris::libthread_init() { 4816 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 4817 4818 // Determine if we are running with the new T2 libthread 4819 os::Solaris::set_T2_libthread(isT2_libthread()); 4820 4821 lwp_priocntl_init(); 4822 4823 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 4824 if(func == NULL) { 4825 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 4826 // Guarantee that this VM is running on an new enough OS (5.6 or 4827 // later) that it will have a new enough libthread.so. 4828 guarantee(func != NULL, "libthread.so is too old."); 4829 } 4830 4831 // Initialize the new libthread getstate API wrappers 4832 func = resolve_symbol("thr_getstate"); 4833 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func)); 4834 4835 func = resolve_symbol("thr_setstate"); 4836 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func)); 4837 4838 func = resolve_symbol("thr_setmutator"); 4839 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func)); 4840 4841 func = resolve_symbol("thr_suspend_mutator"); 4842 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func)); 4843 4844 func = resolve_symbol("thr_continue_mutator"); 4845 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func)); 4846 4847 int size; 4848 void (*handler_info_func)(address *, int *); 4849 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 4850 handler_info_func(&handler_start, &size); 4851 handler_end = handler_start + size; 4852} 4853 4854 4855int_fnP_mutex_tP os::Solaris::_mutex_lock; 4856int_fnP_mutex_tP os::Solaris::_mutex_trylock; 4857int_fnP_mutex_tP os::Solaris::_mutex_unlock; 4858int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 4859int_fnP_mutex_tP os::Solaris::_mutex_destroy; 4860int os::Solaris::_mutex_scope = USYNC_THREAD; 4861 4862int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 4863int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 4864int_fnP_cond_tP os::Solaris::_cond_signal; 4865int_fnP_cond_tP os::Solaris::_cond_broadcast; 4866int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 4867int_fnP_cond_tP os::Solaris::_cond_destroy; 4868int os::Solaris::_cond_scope = USYNC_THREAD; 4869 4870void os::Solaris::synchronization_init() { 4871 if(UseLWPSynchronization) { 4872 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 4873 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 4874 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 4875 os::Solaris::set_mutex_init(lwp_mutex_init); 4876 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 4877 os::Solaris::set_mutex_scope(USYNC_THREAD); 4878 4879 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 4880 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 4881 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 4882 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 4883 os::Solaris::set_cond_init(lwp_cond_init); 4884 os::Solaris::set_cond_destroy(lwp_cond_destroy); 4885 os::Solaris::set_cond_scope(USYNC_THREAD); 4886 } 4887 else { 4888 os::Solaris::set_mutex_scope(USYNC_THREAD); 4889 os::Solaris::set_cond_scope(USYNC_THREAD); 4890 4891 if(UsePthreads) { 4892 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 4893 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 4894 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 4895 os::Solaris::set_mutex_init(pthread_mutex_default_init); 4896 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 4897 4898 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 4899 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 4900 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 4901 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 4902 os::Solaris::set_cond_init(pthread_cond_default_init); 4903 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 4904 } 4905 else { 4906 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 4907 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 4908 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 4909 os::Solaris::set_mutex_init(::mutex_init); 4910 os::Solaris::set_mutex_destroy(::mutex_destroy); 4911 4912 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 4913 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 4914 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 4915 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 4916 os::Solaris::set_cond_init(::cond_init); 4917 os::Solaris::set_cond_destroy(::cond_destroy); 4918 } 4919 } 4920} 4921 4922bool os::Solaris::liblgrp_init() { 4923 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); 4924 if (handle != NULL) { 4925 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 4926 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 4927 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 4928 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 4929 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 4930 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); 4931 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 4932 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 4933 dlsym(handle, "lgrp_cookie_stale"))); 4934 4935 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 4936 set_lgrp_cookie(c); 4937 return true; 4938 } 4939 return false; 4940} 4941 4942void os::Solaris::misc_sym_init() { 4943 address func; 4944 4945 // getisax 4946 func = resolve_symbol_lazy("getisax"); 4947 if (func != NULL) { 4948 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func); 4949 } 4950 4951 // meminfo 4952 func = resolve_symbol_lazy("meminfo"); 4953 if (func != NULL) { 4954 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func)); 4955 } 4956} 4957 4958uint_t os::Solaris::getisax(uint32_t* array, uint_t n) { 4959 assert(_getisax != NULL, "_getisax not set"); 4960 return _getisax(array, n); 4961} 4962 4963// Symbol doesn't exist in Solaris 8 pset.h 4964#ifndef PS_MYID 4965#define PS_MYID -3 4966#endif 4967 4968// int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 4969typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 4970static pset_getloadavg_type pset_getloadavg_ptr = NULL; 4971 4972void init_pset_getloadavg_ptr(void) { 4973 pset_getloadavg_ptr = 4974 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 4975 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) { 4976 warning("pset_getloadavg function not found"); 4977 } 4978} 4979 4980int os::Solaris::_dev_zero_fd = -1; 4981 4982// this is called _before_ the global arguments have been parsed 4983void os::init(void) { 4984 _initial_pid = getpid(); 4985 4986 max_hrtime = first_hrtime = gethrtime(); 4987 4988 init_random(1234567); 4989 4990 page_size = sysconf(_SC_PAGESIZE); 4991 if (page_size == -1) 4992 fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)", 4993 strerror(errno))); 4994 init_page_sizes((size_t) page_size); 4995 4996 Solaris::initialize_system_info(); 4997 4998 // Initialize misc. symbols as soon as possible, so we can use them 4999 // if we need them. 5000 Solaris::misc_sym_init(); 5001 5002 int fd = ::open("/dev/zero", O_RDWR); 5003 if (fd < 0) { 5004 fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno))); 5005 } else { 5006 Solaris::set_dev_zero_fd(fd); 5007 5008 // Close on exec, child won't inherit. 5009 fcntl(fd, F_SETFD, FD_CLOEXEC); 5010 } 5011 5012 clock_tics_per_sec = CLK_TCK; 5013 5014 // check if dladdr1() exists; dladdr1 can provide more information than 5015 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 5016 // and is available on linker patches for 5.7 and 5.8. 5017 // libdl.so must have been loaded, this call is just an entry lookup 5018 void * hdl = dlopen("libdl.so", RTLD_NOW); 5019 if (hdl) 5020 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 5021 5022 // (Solaris only) this switches to calls that actually do locking. 5023 ThreadCritical::initialize(); 5024 5025 main_thread = thr_self(); 5026 5027 // Constant minimum stack size allowed. It must be at least 5028 // the minimum of what the OS supports (thr_min_stack()), and 5029 // enough to allow the thread to get to user bytecode execution. 5030 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed); 5031 // If the pagesize of the VM is greater than 8K determine the appropriate 5032 // number of initial guard pages. The user can change this with the 5033 // command line arguments, if needed. 5034 if (vm_page_size() > 8*K) { 5035 StackYellowPages = 1; 5036 StackRedPages = 1; 5037 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size(); 5038 } 5039} 5040 5041// To install functions for atexit system call 5042extern "C" { 5043 static void perfMemory_exit_helper() { 5044 perfMemory_exit(); 5045 } 5046} 5047 5048// this is called _after_ the global arguments have been parsed 5049jint os::init_2(void) { 5050 // try to enable extended file IO ASAP, see 6431278 5051 os::Solaris::try_enable_extended_io(); 5052 5053 // Allocate a single page and mark it as readable for safepoint polling. Also 5054 // use this first mmap call to check support for MAP_ALIGN. 5055 address polling_page = (address)Solaris::mmap_chunk((char*)page_size, 5056 page_size, 5057 MAP_PRIVATE | MAP_ALIGN, 5058 PROT_READ); 5059 if (polling_page == NULL) { 5060 has_map_align = false; 5061 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, 5062 PROT_READ); 5063 } 5064 5065 os::set_polling_page(polling_page); 5066 5067#ifndef PRODUCT 5068 if( Verbose && PrintMiscellaneous ) 5069 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 5070#endif 5071 5072 if (!UseMembar) { 5073 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE ); 5074 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 5075 os::set_memory_serialize_page( mem_serialize_page ); 5076 5077#ifndef PRODUCT 5078 if(Verbose && PrintMiscellaneous) 5079 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 5080#endif 5081} 5082 5083 os::large_page_init(); 5084 5085 // Check minimum allowable stack size for thread creation and to initialize 5086 // the java system classes, including StackOverflowError - depends on page 5087 // size. Add a page for compiler2 recursion in main thread. 5088 // Add in 2*BytesPerWord times page size to account for VM stack during 5089 // class initialization depending on 32 or 64 bit VM. 5090 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed, 5091 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 5092 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size); 5093 5094 size_t threadStackSizeInBytes = ThreadStackSize * K; 5095 if (threadStackSizeInBytes != 0 && 5096 threadStackSizeInBytes < os::Solaris::min_stack_allowed) { 5097 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk", 5098 os::Solaris::min_stack_allowed/K); 5099 return JNI_ERR; 5100 } 5101 5102 // For 64kbps there will be a 64kb page size, which makes 5103 // the usable default stack size quite a bit less. Increase the 5104 // stack for 64kb (or any > than 8kb) pages, this increases 5105 // virtual memory fragmentation (since we're not creating the 5106 // stack on a power of 2 boundary. The real fix for this 5107 // should be to fix the guard page mechanism. 5108 5109 if (vm_page_size() > 8*K) { 5110 threadStackSizeInBytes = (threadStackSizeInBytes != 0) 5111 ? threadStackSizeInBytes + 5112 ((StackYellowPages + StackRedPages) * vm_page_size()) 5113 : 0; 5114 ThreadStackSize = threadStackSizeInBytes/K; 5115 } 5116 5117 // Make the stack size a multiple of the page size so that 5118 // the yellow/red zones can be guarded. 5119 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 5120 vm_page_size())); 5121 5122 Solaris::libthread_init(); 5123 5124 if (UseNUMA) { 5125 if (!Solaris::liblgrp_init()) { 5126 UseNUMA = false; 5127 } else { 5128 size_t lgrp_limit = os::numa_get_groups_num(); 5129 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal); 5130 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); 5131 FREE_C_HEAP_ARRAY(int, lgrp_ids, mtInternal); 5132 if (lgrp_num < 2) { 5133 // There's only one locality group, disable NUMA. 5134 UseNUMA = false; 5135 } 5136 } 5137 // ISM is not compatible with the NUMA allocator - it always allocates 5138 // pages round-robin across the lgroups. 5139 if (UseNUMA && UseLargePages && UseISM) { 5140 if (!FLAG_IS_DEFAULT(UseNUMA)) { 5141 if (FLAG_IS_DEFAULT(UseLargePages) && FLAG_IS_DEFAULT(UseISM)) { 5142 UseLargePages = false; 5143 } else { 5144 warning("UseNUMA is not compatible with ISM large pages, disabling NUMA allocator"); 5145 UseNUMA = false; 5146 } 5147 } else { 5148 UseNUMA = false; 5149 } 5150 } 5151 if (!UseNUMA && ForceNUMA) { 5152 UseNUMA = true; 5153 } 5154 } 5155 5156 Solaris::signal_sets_init(); 5157 Solaris::init_signal_mem(); 5158 Solaris::install_signal_handlers(); 5159 5160 if (libjsigversion < JSIG_VERSION_1_4_1) { 5161 Maxlibjsigsigs = OLDMAXSIGNUM; 5162 } 5163 5164 // initialize synchronization primitives to use either thread or 5165 // lwp synchronization (controlled by UseLWPSynchronization) 5166 Solaris::synchronization_init(); 5167 5168 if (MaxFDLimit) { 5169 // set the number of file descriptors to max. print out error 5170 // if getrlimit/setrlimit fails but continue regardless. 5171 struct rlimit nbr_files; 5172 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 5173 if (status != 0) { 5174 if (PrintMiscellaneous && (Verbose || WizardMode)) 5175 perror("os::init_2 getrlimit failed"); 5176 } else { 5177 nbr_files.rlim_cur = nbr_files.rlim_max; 5178 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 5179 if (status != 0) { 5180 if (PrintMiscellaneous && (Verbose || WizardMode)) 5181 perror("os::init_2 setrlimit failed"); 5182 } 5183 } 5184 } 5185 5186 // Calculate theoretical max. size of Threads to guard gainst 5187 // artifical out-of-memory situations, where all available address- 5188 // space has been reserved by thread stacks. Default stack size is 1Mb. 5189 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 5190 JavaThread::stack_size_at_create() : (1*K*K); 5191 assert(pre_thread_stack_size != 0, "Must have a stack"); 5192 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 5193 // we should start doing Virtual Memory banging. Currently when the threads will 5194 // have used all but 200Mb of space. 5195 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 5196 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 5197 5198 // at-exit methods are called in the reverse order of their registration. 5199 // In Solaris 7 and earlier, atexit functions are called on return from 5200 // main or as a result of a call to exit(3C). There can be only 32 of 5201 // these functions registered and atexit() does not set errno. In Solaris 5202 // 8 and later, there is no limit to the number of functions registered 5203 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 5204 // functions are called upon dlclose(3DL) in addition to return from main 5205 // and exit(3C). 5206 5207 if (PerfAllowAtExitRegistration) { 5208 // only register atexit functions if PerfAllowAtExitRegistration is set. 5209 // atexit functions can be delayed until process exit time, which 5210 // can be problematic for embedded VM situations. Embedded VMs should 5211 // call DestroyJavaVM() to assure that VM resources are released. 5212 5213 // note: perfMemory_exit_helper atexit function may be removed in 5214 // the future if the appropriate cleanup code can be added to the 5215 // VM_Exit VMOperation's doit method. 5216 if (atexit(perfMemory_exit_helper) != 0) { 5217 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 5218 } 5219 } 5220 5221 // Init pset_loadavg function pointer 5222 init_pset_getloadavg_ptr(); 5223 5224 return JNI_OK; 5225} 5226 5227void os::init_3(void) { 5228 return; 5229} 5230 5231// Mark the polling page as unreadable 5232void os::make_polling_page_unreadable(void) { 5233 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 ) 5234 fatal("Could not disable polling page"); 5235}; 5236 5237// Mark the polling page as readable 5238void os::make_polling_page_readable(void) { 5239 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 ) 5240 fatal("Could not enable polling page"); 5241}; 5242 5243// OS interface. 5244 5245bool os::check_heap(bool force) { return true; } 5246 5247typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr); 5248static vsnprintf_t sol_vsnprintf = NULL; 5249 5250int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) { 5251 if (!sol_vsnprintf) { 5252 //search for the named symbol in the objects that were loaded after libjvm 5253 void* where = RTLD_NEXT; 5254 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL) 5255 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf")); 5256 if (!sol_vsnprintf){ 5257 //search for the named symbol in the objects that were loaded before libjvm 5258 where = RTLD_DEFAULT; 5259 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL) 5260 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf")); 5261 assert(sol_vsnprintf != NULL, "vsnprintf not found"); 5262 } 5263 } 5264 return (*sol_vsnprintf)(buf, count, fmt, argptr); 5265} 5266 5267 5268// Is a (classpath) directory empty? 5269bool os::dir_is_empty(const char* path) { 5270 DIR *dir = NULL; 5271 struct dirent *ptr; 5272 5273 dir = opendir(path); 5274 if (dir == NULL) return true; 5275 5276 /* Scan the directory */ 5277 bool result = true; 5278 char buf[sizeof(struct dirent) + MAX_PATH]; 5279 struct dirent *dbuf = (struct dirent *) buf; 5280 while (result && (ptr = readdir(dir, dbuf)) != NULL) { 5281 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 5282 result = false; 5283 } 5284 } 5285 closedir(dir); 5286 return result; 5287} 5288 5289// This code originates from JDK's sysOpen and open64_w 5290// from src/solaris/hpi/src/system_md.c 5291 5292#ifndef O_DELETE 5293#define O_DELETE 0x10000 5294#endif 5295 5296// Open a file. Unlink the file immediately after open returns 5297// if the specified oflag has the O_DELETE flag set. 5298// O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c 5299 5300int os::open(const char *path, int oflag, int mode) { 5301 if (strlen(path) > MAX_PATH - 1) { 5302 errno = ENAMETOOLONG; 5303 return -1; 5304 } 5305 int fd; 5306 int o_delete = (oflag & O_DELETE); 5307 oflag = oflag & ~O_DELETE; 5308 5309 fd = ::open64(path, oflag, mode); 5310 if (fd == -1) return -1; 5311 5312 //If the open succeeded, the file might still be a directory 5313 { 5314 struct stat64 buf64; 5315 int ret = ::fstat64(fd, &buf64); 5316 int st_mode = buf64.st_mode; 5317 5318 if (ret != -1) { 5319 if ((st_mode & S_IFMT) == S_IFDIR) { 5320 errno = EISDIR; 5321 ::close(fd); 5322 return -1; 5323 } 5324 } else { 5325 ::close(fd); 5326 return -1; 5327 } 5328 } 5329 /* 5330 * 32-bit Solaris systems suffer from: 5331 * 5332 * - an historical default soft limit of 256 per-process file 5333 * descriptors that is too low for many Java programs. 5334 * 5335 * - a design flaw where file descriptors created using stdio 5336 * fopen must be less than 256, _even_ when the first limit above 5337 * has been raised. This can cause calls to fopen (but not calls to 5338 * open, for example) to fail mysteriously, perhaps in 3rd party 5339 * native code (although the JDK itself uses fopen). One can hardly 5340 * criticize them for using this most standard of all functions. 5341 * 5342 * We attempt to make everything work anyways by: 5343 * 5344 * - raising the soft limit on per-process file descriptors beyond 5345 * 256 5346 * 5347 * - As of Solaris 10u4, we can request that Solaris raise the 256 5348 * stdio fopen limit by calling function enable_extended_FILE_stdio. 5349 * This is done in init_2 and recorded in enabled_extended_FILE_stdio 5350 * 5351 * - If we are stuck on an old (pre 10u4) Solaris system, we can 5352 * workaround the bug by remapping non-stdio file descriptors below 5353 * 256 to ones beyond 256, which is done below. 5354 * 5355 * See: 5356 * 1085341: 32-bit stdio routines should support file descriptors >255 5357 * 6533291: Work around 32-bit Solaris stdio limit of 256 open files 5358 * 6431278: Netbeans crash on 32 bit Solaris: need to call 5359 * enable_extended_FILE_stdio() in VM initialisation 5360 * Giri Mandalika's blog 5361 * http://technopark02.blogspot.com/2005_05_01_archive.html 5362 */ 5363#ifndef _LP64 5364 if ((!enabled_extended_FILE_stdio) && fd < 256) { 5365 int newfd = ::fcntl(fd, F_DUPFD, 256); 5366 if (newfd != -1) { 5367 ::close(fd); 5368 fd = newfd; 5369 } 5370 } 5371#endif // 32-bit Solaris 5372 /* 5373 * All file descriptors that are opened in the JVM and not 5374 * specifically destined for a subprocess should have the 5375 * close-on-exec flag set. If we don't set it, then careless 3rd 5376 * party native code might fork and exec without closing all 5377 * appropriate file descriptors (e.g. as we do in closeDescriptors in 5378 * UNIXProcess.c), and this in turn might: 5379 * 5380 * - cause end-of-file to fail to be detected on some file 5381 * descriptors, resulting in mysterious hangs, or 5382 * 5383 * - might cause an fopen in the subprocess to fail on a system 5384 * suffering from bug 1085341. 5385 * 5386 * (Yes, the default setting of the close-on-exec flag is a Unix 5387 * design flaw) 5388 * 5389 * See: 5390 * 1085341: 32-bit stdio routines should support file descriptors >255 5391 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed 5392 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 5393 */ 5394#ifdef FD_CLOEXEC 5395 { 5396 int flags = ::fcntl(fd, F_GETFD); 5397 if (flags != -1) 5398 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 5399 } 5400#endif 5401 5402 if (o_delete != 0) { 5403 ::unlink(path); 5404 } 5405 return fd; 5406} 5407 5408// create binary file, rewriting existing file if required 5409int os::create_binary_file(const char* path, bool rewrite_existing) { 5410 int oflags = O_WRONLY | O_CREAT; 5411 if (!rewrite_existing) { 5412 oflags |= O_EXCL; 5413 } 5414 return ::open64(path, oflags, S_IREAD | S_IWRITE); 5415} 5416 5417// return current position of file pointer 5418jlong os::current_file_offset(int fd) { 5419 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 5420} 5421 5422// move file pointer to the specified offset 5423jlong os::seek_to_file_offset(int fd, jlong offset) { 5424 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 5425} 5426 5427jlong os::lseek(int fd, jlong offset, int whence) { 5428 return (jlong) ::lseek64(fd, offset, whence); 5429} 5430 5431char * os::native_path(char *path) { 5432 return path; 5433} 5434 5435int os::ftruncate(int fd, jlong length) { 5436 return ::ftruncate64(fd, length); 5437} 5438 5439int os::fsync(int fd) { 5440 RESTARTABLE_RETURN_INT(::fsync(fd)); 5441} 5442 5443int os::available(int fd, jlong *bytes) { 5444 jlong cur, end; 5445 int mode; 5446 struct stat64 buf64; 5447 5448 if (::fstat64(fd, &buf64) >= 0) { 5449 mode = buf64.st_mode; 5450 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 5451 /* 5452 * XXX: is the following call interruptible? If so, this might 5453 * need to go through the INTERRUPT_IO() wrapper as for other 5454 * blocking, interruptible calls in this file. 5455 */ 5456 int n,ioctl_return; 5457 5458 INTERRUPTIBLE(::ioctl(fd, FIONREAD, &n),ioctl_return,os::Solaris::clear_interrupted); 5459 if (ioctl_return>= 0) { 5460 *bytes = n; 5461 return 1; 5462 } 5463 } 5464 } 5465 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 5466 return 0; 5467 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 5468 return 0; 5469 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 5470 return 0; 5471 } 5472 *bytes = end - cur; 5473 return 1; 5474} 5475 5476// Map a block of memory. 5477char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 5478 char *addr, size_t bytes, bool read_only, 5479 bool allow_exec) { 5480 int prot; 5481 int flags; 5482 5483 if (read_only) { 5484 prot = PROT_READ; 5485 flags = MAP_SHARED; 5486 } else { 5487 prot = PROT_READ | PROT_WRITE; 5488 flags = MAP_PRIVATE; 5489 } 5490 5491 if (allow_exec) { 5492 prot |= PROT_EXEC; 5493 } 5494 5495 if (addr != NULL) { 5496 flags |= MAP_FIXED; 5497 } 5498 5499 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 5500 fd, file_offset); 5501 if (mapped_address == MAP_FAILED) { 5502 return NULL; 5503 } 5504 return mapped_address; 5505} 5506 5507 5508// Remap a block of memory. 5509char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 5510 char *addr, size_t bytes, bool read_only, 5511 bool allow_exec) { 5512 // same as map_memory() on this OS 5513 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 5514 allow_exec); 5515} 5516 5517 5518// Unmap a block of memory. 5519bool os::pd_unmap_memory(char* addr, size_t bytes) { 5520 return munmap(addr, bytes) == 0; 5521} 5522 5523void os::pause() { 5524 char filename[MAX_PATH]; 5525 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 5526 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 5527 } else { 5528 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 5529 } 5530 5531 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 5532 if (fd != -1) { 5533 struct stat buf; 5534 ::close(fd); 5535 while (::stat(filename, &buf) == 0) { 5536 (void)::poll(NULL, 0, 100); 5537 } 5538 } else { 5539 jio_fprintf(stderr, 5540 "Could not open pause file '%s', continuing immediately.\n", filename); 5541 } 5542} 5543 5544#ifndef PRODUCT 5545#ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 5546// Turn this on if you need to trace synch operations. 5547// Set RECORD_SYNCH_LIMIT to a large-enough value, 5548// and call record_synch_enable and record_synch_disable 5549// around the computation of interest. 5550 5551void record_synch(char* name, bool returning); // defined below 5552 5553class RecordSynch { 5554 char* _name; 5555 public: 5556 RecordSynch(char* name) :_name(name) 5557 { record_synch(_name, false); } 5558 ~RecordSynch() { record_synch(_name, true); } 5559}; 5560 5561#define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 5562extern "C" ret name params { \ 5563 typedef ret name##_t params; \ 5564 static name##_t* implem = NULL; \ 5565 static int callcount = 0; \ 5566 if (implem == NULL) { \ 5567 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 5568 if (implem == NULL) fatal(dlerror()); \ 5569 } \ 5570 ++callcount; \ 5571 RecordSynch _rs(#name); \ 5572 inner; \ 5573 return implem args; \ 5574} 5575// in dbx, examine callcounts this way: 5576// for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 5577 5578#define CHECK_POINTER_OK(p) \ 5579 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p))) 5580#define CHECK_MU \ 5581 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 5582#define CHECK_CV \ 5583 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 5584#define CHECK_P(p) \ 5585 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 5586 5587#define CHECK_MUTEX(mutex_op) \ 5588CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 5589 5590CHECK_MUTEX( mutex_lock) 5591CHECK_MUTEX( _mutex_lock) 5592CHECK_MUTEX( mutex_unlock) 5593CHECK_MUTEX(_mutex_unlock) 5594CHECK_MUTEX( mutex_trylock) 5595CHECK_MUTEX(_mutex_trylock) 5596 5597#define CHECK_COND(cond_op) \ 5598CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV); 5599 5600CHECK_COND( cond_wait); 5601CHECK_COND(_cond_wait); 5602CHECK_COND(_cond_wait_cancel); 5603 5604#define CHECK_COND2(cond_op) \ 5605CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV); 5606 5607CHECK_COND2( cond_timedwait); 5608CHECK_COND2(_cond_timedwait); 5609CHECK_COND2(_cond_timedwait_cancel); 5610 5611// do the _lwp_* versions too 5612#define mutex_t lwp_mutex_t 5613#define cond_t lwp_cond_t 5614CHECK_MUTEX( _lwp_mutex_lock) 5615CHECK_MUTEX( _lwp_mutex_unlock) 5616CHECK_MUTEX( _lwp_mutex_trylock) 5617CHECK_MUTEX( __lwp_mutex_lock) 5618CHECK_MUTEX( __lwp_mutex_unlock) 5619CHECK_MUTEX( __lwp_mutex_trylock) 5620CHECK_MUTEX(___lwp_mutex_lock) 5621CHECK_MUTEX(___lwp_mutex_unlock) 5622 5623CHECK_COND( _lwp_cond_wait); 5624CHECK_COND( __lwp_cond_wait); 5625CHECK_COND(___lwp_cond_wait); 5626 5627CHECK_COND2( _lwp_cond_timedwait); 5628CHECK_COND2( __lwp_cond_timedwait); 5629#undef mutex_t 5630#undef cond_t 5631 5632CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 5633CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 5634CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 5635CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 5636CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 5637CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 5638CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 5639CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 5640 5641 5642// recording machinery: 5643 5644enum { RECORD_SYNCH_LIMIT = 200 }; 5645char* record_synch_name[RECORD_SYNCH_LIMIT]; 5646void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 5647bool record_synch_returning[RECORD_SYNCH_LIMIT]; 5648thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 5649int record_synch_count = 0; 5650bool record_synch_enabled = false; 5651 5652// in dbx, examine recorded data this way: 5653// for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 5654 5655void record_synch(char* name, bool returning) { 5656 if (record_synch_enabled) { 5657 if (record_synch_count < RECORD_SYNCH_LIMIT) { 5658 record_synch_name[record_synch_count] = name; 5659 record_synch_returning[record_synch_count] = returning; 5660 record_synch_thread[record_synch_count] = thr_self(); 5661 record_synch_arg0ptr[record_synch_count] = &name; 5662 record_synch_count++; 5663 } 5664 // put more checking code here: 5665 // ... 5666 } 5667} 5668 5669void record_synch_enable() { 5670 // start collecting trace data, if not already doing so 5671 if (!record_synch_enabled) record_synch_count = 0; 5672 record_synch_enabled = true; 5673} 5674 5675void record_synch_disable() { 5676 // stop collecting trace data 5677 record_synch_enabled = false; 5678} 5679 5680#endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 5681#endif // PRODUCT 5682 5683const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 5684const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 5685 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 5686 5687 5688// JVMTI & JVM monitoring and management support 5689// The thread_cpu_time() and current_thread_cpu_time() are only 5690// supported if is_thread_cpu_time_supported() returns true. 5691// They are not supported on Solaris T1. 5692 5693// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 5694// are used by JVM M&M and JVMTI to get user+sys or user CPU time 5695// of a thread. 5696// 5697// current_thread_cpu_time() and thread_cpu_time(Thread *) 5698// returns the fast estimate available on the platform. 5699 5700// hrtime_t gethrvtime() return value includes 5701// user time but does not include system time 5702jlong os::current_thread_cpu_time() { 5703 return (jlong) gethrvtime(); 5704} 5705 5706jlong os::thread_cpu_time(Thread *thread) { 5707 // return user level CPU time only to be consistent with 5708 // what current_thread_cpu_time returns. 5709 // thread_cpu_time_info() must be changed if this changes 5710 return os::thread_cpu_time(thread, false /* user time only */); 5711} 5712 5713jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 5714 if (user_sys_cpu_time) { 5715 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 5716 } else { 5717 return os::current_thread_cpu_time(); 5718 } 5719} 5720 5721jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 5722 char proc_name[64]; 5723 int count; 5724 prusage_t prusage; 5725 jlong lwp_time; 5726 int fd; 5727 5728 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 5729 getpid(), 5730 thread->osthread()->lwp_id()); 5731 fd = ::open(proc_name, O_RDONLY); 5732 if ( fd == -1 ) return -1; 5733 5734 do { 5735 count = ::pread(fd, 5736 (void *)&prusage.pr_utime, 5737 thr_time_size, 5738 thr_time_off); 5739 } while (count < 0 && errno == EINTR); 5740 ::close(fd); 5741 if ( count < 0 ) return -1; 5742 5743 if (user_sys_cpu_time) { 5744 // user + system CPU time 5745 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 5746 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 5747 (jlong)prusage.pr_stime.tv_nsec + 5748 (jlong)prusage.pr_utime.tv_nsec; 5749 } else { 5750 // user level CPU time only 5751 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 5752 (jlong)prusage.pr_utime.tv_nsec; 5753 } 5754 5755 return(lwp_time); 5756} 5757 5758void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5759 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5760 info_ptr->may_skip_backward = false; // elapsed time not wall time 5761 info_ptr->may_skip_forward = false; // elapsed time not wall time 5762 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5763} 5764 5765void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5766 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5767 info_ptr->may_skip_backward = false; // elapsed time not wall time 5768 info_ptr->may_skip_forward = false; // elapsed time not wall time 5769 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5770} 5771 5772bool os::is_thread_cpu_time_supported() { 5773 if ( os::Solaris::T2_libthread() || UseBoundThreads ) { 5774 return true; 5775 } else { 5776 return false; 5777 } 5778} 5779 5780// System loadavg support. Returns -1 if load average cannot be obtained. 5781// Return the load average for our processor set if the primitive exists 5782// (Solaris 9 and later). Otherwise just return system wide loadavg. 5783int os::loadavg(double loadavg[], int nelem) { 5784 if (pset_getloadavg_ptr != NULL) { 5785 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 5786 } else { 5787 return ::getloadavg(loadavg, nelem); 5788 } 5789} 5790 5791//--------------------------------------------------------------------------------- 5792 5793bool os::find(address addr, outputStream* st) { 5794 Dl_info dlinfo; 5795 memset(&dlinfo, 0, sizeof(dlinfo)); 5796 if (dladdr(addr, &dlinfo)) { 5797#ifdef _LP64 5798 st->print("0x%016lx: ", addr); 5799#else 5800 st->print("0x%08x: ", addr); 5801#endif 5802 if (dlinfo.dli_sname != NULL) 5803 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 5804 else if (dlinfo.dli_fname) 5805 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 5806 else 5807 st->print("<absolute address>"); 5808 if (dlinfo.dli_fname) st->print(" in %s", dlinfo.dli_fname); 5809#ifdef _LP64 5810 if (dlinfo.dli_fbase) st->print(" at 0x%016lx", dlinfo.dli_fbase); 5811#else 5812 if (dlinfo.dli_fbase) st->print(" at 0x%08x", dlinfo.dli_fbase); 5813#endif 5814 st->cr(); 5815 5816 if (Verbose) { 5817 // decode some bytes around the PC 5818 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 5819 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 5820 address lowest = (address) dlinfo.dli_sname; 5821 if (!lowest) lowest = (address) dlinfo.dli_fbase; 5822 if (begin < lowest) begin = lowest; 5823 Dl_info dlinfo2; 5824 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr 5825 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) 5826 end = (address) dlinfo2.dli_saddr; 5827 Disassembler::decode(begin, end, st); 5828 } 5829 return true; 5830 } 5831 return false; 5832} 5833 5834// Following function has been added to support HotSparc's libjvm.so running 5835// under Solaris production JDK 1.2.2 / 1.3.0. These came from 5836// src/solaris/hpi/native_threads in the EVM codebase. 5837// 5838// NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 5839// libraries and should thus be removed. We will leave it behind for a while 5840// until we no longer want to able to run on top of 1.3.0 Solaris production 5841// JDK. See 4341971. 5842 5843#define STACK_SLACK 0x800 5844 5845extern "C" { 5846 intptr_t sysThreadAvailableStackWithSlack() { 5847 stack_t st; 5848 intptr_t retval, stack_top; 5849 retval = thr_stksegment(&st); 5850 assert(retval == 0, "incorrect return value from thr_stksegment"); 5851 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 5852 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 5853 stack_top=(intptr_t)st.ss_sp-st.ss_size; 5854 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 5855 } 5856} 5857 5858// ObjectMonitor park-unpark infrastructure ... 5859// 5860// We implement Solaris and Linux PlatformEvents with the 5861// obvious condvar-mutex-flag triple. 5862// Another alternative that works quite well is pipes: 5863// Each PlatformEvent consists of a pipe-pair. 5864// The thread associated with the PlatformEvent 5865// calls park(), which reads from the input end of the pipe. 5866// Unpark() writes into the other end of the pipe. 5867// The write-side of the pipe must be set NDELAY. 5868// Unfortunately pipes consume a large # of handles. 5869// Native solaris lwp_park() and lwp_unpark() work nicely, too. 5870// Using pipes for the 1st few threads might be workable, however. 5871// 5872// park() is permitted to return spuriously. 5873// Callers of park() should wrap the call to park() in 5874// an appropriate loop. A litmus test for the correct 5875// usage of park is the following: if park() were modified 5876// to immediately return 0 your code should still work, 5877// albeit degenerating to a spin loop. 5878// 5879// An interesting optimization for park() is to use a trylock() 5880// to attempt to acquire the mutex. If the trylock() fails 5881// then we know that a concurrent unpark() operation is in-progress. 5882// in that case the park() code could simply set _count to 0 5883// and return immediately. The subsequent park() operation *might* 5884// return immediately. That's harmless as the caller of park() is 5885// expected to loop. By using trylock() we will have avoided a 5886// avoided a context switch caused by contention on the per-thread mutex. 5887// 5888// TODO-FIXME: 5889// 1. Reconcile Doug's JSR166 j.u.c park-unpark with the 5890// objectmonitor implementation. 5891// 2. Collapse the JSR166 parker event, and the 5892// objectmonitor ParkEvent into a single "Event" construct. 5893// 3. In park() and unpark() add: 5894// assert (Thread::current() == AssociatedWith). 5895// 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch. 5896// 1-out-of-N park() operations will return immediately. 5897// 5898// _Event transitions in park() 5899// -1 => -1 : illegal 5900// 1 => 0 : pass - return immediately 5901// 0 => -1 : block 5902// 5903// _Event serves as a restricted-range semaphore. 5904// 5905// Another possible encoding of _Event would be with 5906// explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5907// 5908// TODO-FIXME: add DTRACE probes for: 5909// 1. Tx parks 5910// 2. Ty unparks Tx 5911// 3. Tx resumes from park 5912 5913 5914// value determined through experimentation 5915#define ROUNDINGFIX 11 5916 5917// utility to compute the abstime argument to timedwait. 5918// TODO-FIXME: switch from compute_abstime() to unpackTime(). 5919 5920static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 5921 // millis is the relative timeout time 5922 // abstime will be the absolute timeout time 5923 if (millis < 0) millis = 0; 5924 struct timeval now; 5925 int status = gettimeofday(&now, NULL); 5926 assert(status == 0, "gettimeofday"); 5927 jlong seconds = millis / 1000; 5928 jlong max_wait_period; 5929 5930 if (UseLWPSynchronization) { 5931 // forward port of fix for 4275818 (not sleeping long enough) 5932 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 5933 // _lwp_cond_timedwait() used a round_down algorithm rather 5934 // than a round_up. For millis less than our roundfactor 5935 // it rounded down to 0 which doesn't meet the spec. 5936 // For millis > roundfactor we may return a bit sooner, but 5937 // since we can not accurately identify the patch level and 5938 // this has already been fixed in Solaris 9 and 8 we will 5939 // leave it alone rather than always rounding down. 5940 5941 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 5942 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 5943 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 5944 max_wait_period = 21000000; 5945 } else { 5946 max_wait_period = 50000000; 5947 } 5948 millis %= 1000; 5949 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 5950 seconds = max_wait_period; 5951 } 5952 abstime->tv_sec = now.tv_sec + seconds; 5953 long usec = now.tv_usec + millis * 1000; 5954 if (usec >= 1000000) { 5955 abstime->tv_sec += 1; 5956 usec -= 1000000; 5957 } 5958 abstime->tv_nsec = usec * 1000; 5959 return abstime; 5960} 5961 5962// Test-and-clear _Event, always leaves _Event set to 0, returns immediately. 5963// Conceptually TryPark() should be equivalent to park(0). 5964 5965int os::PlatformEvent::TryPark() { 5966 for (;;) { 5967 const int v = _Event ; 5968 guarantee ((v == 0) || (v == 1), "invariant") ; 5969 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; 5970 } 5971} 5972 5973void os::PlatformEvent::park() { // AKA: down() 5974 // Invariant: Only the thread associated with the Event/PlatformEvent 5975 // may call park(). 5976 int v ; 5977 for (;;) { 5978 v = _Event ; 5979 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 5980 } 5981 guarantee (v >= 0, "invariant") ; 5982 if (v == 0) { 5983 // Do this the hard way by blocking ... 5984 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5985 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 5986 // Only for SPARC >= V8PlusA 5987#if defined(__sparc) && defined(COMPILER2) 5988 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 5989#endif 5990 int status = os::Solaris::mutex_lock(_mutex); 5991 assert_status(status == 0, status, "mutex_lock"); 5992 guarantee (_nParked == 0, "invariant") ; 5993 ++ _nParked ; 5994 while (_Event < 0) { 5995 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 5996 // Treat this the same as if the wait was interrupted 5997 // With usr/lib/lwp going to kernel, always handle ETIME 5998 status = os::Solaris::cond_wait(_cond, _mutex); 5999 if (status == ETIME) status = EINTR ; 6000 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 6001 } 6002 -- _nParked ; 6003 _Event = 0 ; 6004 status = os::Solaris::mutex_unlock(_mutex); 6005 assert_status(status == 0, status, "mutex_unlock"); 6006 // Paranoia to ensure our locked and lock-free paths interact 6007 // correctly with each other. 6008 OrderAccess::fence(); 6009 } 6010} 6011 6012int os::PlatformEvent::park(jlong millis) { 6013 guarantee (_nParked == 0, "invariant") ; 6014 int v ; 6015 for (;;) { 6016 v = _Event ; 6017 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 6018 } 6019 guarantee (v >= 0, "invariant") ; 6020 if (v != 0) return OS_OK ; 6021 6022 int ret = OS_TIMEOUT; 6023 timestruc_t abst; 6024 compute_abstime (&abst, millis); 6025 6026 // See http://monaco.sfbay/detail.jsf?cr=5094058. 6027 // For Solaris SPARC set fprs.FEF=0 prior to parking. 6028 // Only for SPARC >= V8PlusA 6029#if defined(__sparc) && defined(COMPILER2) 6030 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 6031#endif 6032 int status = os::Solaris::mutex_lock(_mutex); 6033 assert_status(status == 0, status, "mutex_lock"); 6034 guarantee (_nParked == 0, "invariant") ; 6035 ++ _nParked ; 6036 while (_Event < 0) { 6037 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 6038 assert_status(status == 0 || status == EINTR || 6039 status == ETIME || status == ETIMEDOUT, 6040 status, "cond_timedwait"); 6041 if (!FilterSpuriousWakeups) break ; // previous semantics 6042 if (status == ETIME || status == ETIMEDOUT) break ; 6043 // We consume and ignore EINTR and spurious wakeups. 6044 } 6045 -- _nParked ; 6046 if (_Event >= 0) ret = OS_OK ; 6047 _Event = 0 ; 6048 status = os::Solaris::mutex_unlock(_mutex); 6049 assert_status(status == 0, status, "mutex_unlock"); 6050 // Paranoia to ensure our locked and lock-free paths interact 6051 // correctly with each other. 6052 OrderAccess::fence(); 6053 return ret; 6054} 6055 6056void os::PlatformEvent::unpark() { 6057 // Transitions for _Event: 6058 // 0 :=> 1 6059 // 1 :=> 1 6060 // -1 :=> either 0 or 1; must signal target thread 6061 // That is, we can safely transition _Event from -1 to either 6062 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back 6063 // unpark() calls. 6064 // See also: "Semaphores in Plan 9" by Mullender & Cox 6065 // 6066 // Note: Forcing a transition from "-1" to "1" on an unpark() means 6067 // that it will take two back-to-back park() calls for the owning 6068 // thread to block. This has the benefit of forcing a spurious return 6069 // from the first park() call after an unpark() call which will help 6070 // shake out uses of park() and unpark() without condition variables. 6071 6072 if (Atomic::xchg(1, &_Event) >= 0) return; 6073 6074 // If the thread associated with the event was parked, wake it. 6075 // Wait for the thread assoc with the PlatformEvent to vacate. 6076 int status = os::Solaris::mutex_lock(_mutex); 6077 assert_status(status == 0, status, "mutex_lock"); 6078 int AnyWaiters = _nParked; 6079 status = os::Solaris::mutex_unlock(_mutex); 6080 assert_status(status == 0, status, "mutex_unlock"); 6081 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 6082 if (AnyWaiters != 0) { 6083 // We intentional signal *after* dropping the lock 6084 // to avoid a common class of futile wakeups. 6085 status = os::Solaris::cond_signal(_cond); 6086 assert_status(status == 0, status, "cond_signal"); 6087 } 6088} 6089 6090// JSR166 6091// ------------------------------------------------------- 6092 6093/* 6094 * The solaris and linux implementations of park/unpark are fairly 6095 * conservative for now, but can be improved. They currently use a 6096 * mutex/condvar pair, plus _counter. 6097 * Park decrements _counter if > 0, else does a condvar wait. Unpark 6098 * sets count to 1 and signals condvar. Only one thread ever waits 6099 * on the condvar. Contention seen when trying to park implies that someone 6100 * is unparking you, so don't wait. And spurious returns are fine, so there 6101 * is no need to track notifications. 6102 */ 6103 6104#define MAX_SECS 100000000 6105/* 6106 * This code is common to linux and solaris and will be moved to a 6107 * common place in dolphin. 6108 * 6109 * The passed in time value is either a relative time in nanoseconds 6110 * or an absolute time in milliseconds. Either way it has to be unpacked 6111 * into suitable seconds and nanoseconds components and stored in the 6112 * given timespec structure. 6113 * Given time is a 64-bit value and the time_t used in the timespec is only 6114 * a signed-32-bit value (except on 64-bit Linux) we have to watch for 6115 * overflow if times way in the future are given. Further on Solaris versions 6116 * prior to 10 there is a restriction (see cond_timedwait) that the specified 6117 * number of seconds, in abstime, is less than current_time + 100,000,000. 6118 * As it will be 28 years before "now + 100000000" will overflow we can 6119 * ignore overflow and just impose a hard-limit on seconds using the value 6120 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 6121 * years from "now". 6122 */ 6123static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 6124 assert (time > 0, "convertTime"); 6125 6126 struct timeval now; 6127 int status = gettimeofday(&now, NULL); 6128 assert(status == 0, "gettimeofday"); 6129 6130 time_t max_secs = now.tv_sec + MAX_SECS; 6131 6132 if (isAbsolute) { 6133 jlong secs = time / 1000; 6134 if (secs > max_secs) { 6135 absTime->tv_sec = max_secs; 6136 } 6137 else { 6138 absTime->tv_sec = secs; 6139 } 6140 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 6141 } 6142 else { 6143 jlong secs = time / NANOSECS_PER_SEC; 6144 if (secs >= MAX_SECS) { 6145 absTime->tv_sec = max_secs; 6146 absTime->tv_nsec = 0; 6147 } 6148 else { 6149 absTime->tv_sec = now.tv_sec + secs; 6150 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 6151 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 6152 absTime->tv_nsec -= NANOSECS_PER_SEC; 6153 ++absTime->tv_sec; // note: this must be <= max_secs 6154 } 6155 } 6156 } 6157 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 6158 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 6159 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 6160 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 6161} 6162 6163void Parker::park(bool isAbsolute, jlong time) { 6164 // Ideally we'd do something useful while spinning, such 6165 // as calling unpackTime(). 6166 6167 // Optional fast-path check: 6168 // Return immediately if a permit is available. 6169 // We depend on Atomic::xchg() having full barrier semantics 6170 // since we are doing a lock-free update to _counter. 6171 if (Atomic::xchg(0, &_counter) > 0) return; 6172 6173 // Optional fast-exit: Check interrupt before trying to wait 6174 Thread* thread = Thread::current(); 6175 assert(thread->is_Java_thread(), "Must be JavaThread"); 6176 JavaThread *jt = (JavaThread *)thread; 6177 if (Thread::is_interrupted(thread, false)) { 6178 return; 6179 } 6180 6181 // First, demultiplex/decode time arguments 6182 timespec absTime; 6183 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all 6184 return; 6185 } 6186 if (time > 0) { 6187 // Warning: this code might be exposed to the old Solaris time 6188 // round-down bugs. Grep "roundingFix" for details. 6189 unpackTime(&absTime, isAbsolute, time); 6190 } 6191 6192 // Enter safepoint region 6193 // Beware of deadlocks such as 6317397. 6194 // The per-thread Parker:: _mutex is a classic leaf-lock. 6195 // In particular a thread must never block on the Threads_lock while 6196 // holding the Parker:: mutex. If safepoints are pending both the 6197 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 6198 ThreadBlockInVM tbivm(jt); 6199 6200 // Don't wait if cannot get lock since interference arises from 6201 // unblocking. Also. check interrupt before trying wait 6202 if (Thread::is_interrupted(thread, false) || 6203 os::Solaris::mutex_trylock(_mutex) != 0) { 6204 return; 6205 } 6206 6207 int status ; 6208 6209 if (_counter > 0) { // no wait needed 6210 _counter = 0; 6211 status = os::Solaris::mutex_unlock(_mutex); 6212 assert (status == 0, "invariant") ; 6213 // Paranoia to ensure our locked and lock-free paths interact 6214 // correctly with each other and Java-level accesses. 6215 OrderAccess::fence(); 6216 return; 6217 } 6218 6219#ifdef ASSERT 6220 // Don't catch signals while blocked; let the running threads have the signals. 6221 // (This allows a debugger to break into the running thread.) 6222 sigset_t oldsigs; 6223 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals(); 6224 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 6225#endif 6226 6227 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 6228 jt->set_suspend_equivalent(); 6229 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 6230 6231 // Do this the hard way by blocking ... 6232 // See http://monaco.sfbay/detail.jsf?cr=5094058. 6233 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 6234 // Only for SPARC >= V8PlusA 6235#if defined(__sparc) && defined(COMPILER2) 6236 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 6237#endif 6238 6239 if (time == 0) { 6240 status = os::Solaris::cond_wait (_cond, _mutex) ; 6241 } else { 6242 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 6243 } 6244 // Note that an untimed cond_wait() can sometimes return ETIME on older 6245 // versions of the Solaris. 6246 assert_status(status == 0 || status == EINTR || 6247 status == ETIME || status == ETIMEDOUT, 6248 status, "cond_timedwait"); 6249 6250#ifdef ASSERT 6251 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL); 6252#endif 6253 _counter = 0 ; 6254 status = os::Solaris::mutex_unlock(_mutex); 6255 assert_status(status == 0, status, "mutex_unlock") ; 6256 // Paranoia to ensure our locked and lock-free paths interact 6257 // correctly with each other and Java-level accesses. 6258 OrderAccess::fence(); 6259 6260 // If externally suspended while waiting, re-suspend 6261 if (jt->handle_special_suspend_equivalent_condition()) { 6262 jt->java_suspend_self(); 6263 } 6264} 6265 6266void Parker::unpark() { 6267 int s, status ; 6268 status = os::Solaris::mutex_lock (_mutex) ; 6269 assert (status == 0, "invariant") ; 6270 s = _counter; 6271 _counter = 1; 6272 status = os::Solaris::mutex_unlock (_mutex) ; 6273 assert (status == 0, "invariant") ; 6274 6275 if (s < 1) { 6276 status = os::Solaris::cond_signal (_cond) ; 6277 assert (status == 0, "invariant") ; 6278 } 6279} 6280 6281extern char** environ; 6282 6283// Run the specified command in a separate process. Return its exit value, 6284// or -1 on failure (e.g. can't fork a new process). 6285// Unlike system(), this function can be called from signal handler. It 6286// doesn't block SIGINT et al. 6287int os::fork_and_exec(char* cmd) { 6288 char * argv[4]; 6289 argv[0] = (char *)"sh"; 6290 argv[1] = (char *)"-c"; 6291 argv[2] = cmd; 6292 argv[3] = NULL; 6293 6294 // fork is async-safe, fork1 is not so can't use in signal handler 6295 pid_t pid; 6296 Thread* t = ThreadLocalStorage::get_thread_slow(); 6297 if (t != NULL && t->is_inside_signal_handler()) { 6298 pid = fork(); 6299 } else { 6300 pid = fork1(); 6301 } 6302 6303 if (pid < 0) { 6304 // fork failed 6305 warning("fork failed: %s", strerror(errno)); 6306 return -1; 6307 6308 } else if (pid == 0) { 6309 // child process 6310 6311 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 6312 execve("/usr/bin/sh", argv, environ); 6313 6314 // execve failed 6315 _exit(-1); 6316 6317 } else { 6318 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 6319 // care about the actual exit code, for now. 6320 6321 int status; 6322 6323 // Wait for the child process to exit. This returns immediately if 6324 // the child has already exited. */ 6325 while (waitpid(pid, &status, 0) < 0) { 6326 switch (errno) { 6327 case ECHILD: return 0; 6328 case EINTR: break; 6329 default: return -1; 6330 } 6331 } 6332 6333 if (WIFEXITED(status)) { 6334 // The child exited normally; get its exit code. 6335 return WEXITSTATUS(status); 6336 } else if (WIFSIGNALED(status)) { 6337 // The child exited because of a signal 6338 // The best value to return is 0x80 + signal number, 6339 // because that is what all Unix shells do, and because 6340 // it allows callers to distinguish between process exit and 6341 // process death by signal. 6342 return 0x80 + WTERMSIG(status); 6343 } else { 6344 // Unknown exit code; pass it through 6345 return status; 6346 } 6347 } 6348} 6349 6350// is_headless_jre() 6351// 6352// Test for the existence of xawt/libmawt.so or libawt_xawt.so 6353// in order to report if we are running in a headless jre 6354// 6355// Since JDK8 xawt/libmawt.so was moved into the same directory 6356// as libawt.so, and renamed libawt_xawt.so 6357// 6358bool os::is_headless_jre() { 6359 struct stat statbuf; 6360 char buf[MAXPATHLEN]; 6361 char libmawtpath[MAXPATHLEN]; 6362 const char *xawtstr = "/xawt/libmawt.so"; 6363 const char *new_xawtstr = "/libawt_xawt.so"; 6364 char *p; 6365 6366 // Get path to libjvm.so 6367 os::jvm_path(buf, sizeof(buf)); 6368 6369 // Get rid of libjvm.so 6370 p = strrchr(buf, '/'); 6371 if (p == NULL) return false; 6372 else *p = '\0'; 6373 6374 // Get rid of client or server 6375 p = strrchr(buf, '/'); 6376 if (p == NULL) return false; 6377 else *p = '\0'; 6378 6379 // check xawt/libmawt.so 6380 strcpy(libmawtpath, buf); 6381 strcat(libmawtpath, xawtstr); 6382 if (::stat(libmawtpath, &statbuf) == 0) return false; 6383 6384 // check libawt_xawt.so 6385 strcpy(libmawtpath, buf); 6386 strcat(libmawtpath, new_xawtstr); 6387 if (::stat(libmawtpath, &statbuf) == 0) return false; 6388 6389 return true; 6390} 6391 6392size_t os::write(int fd, const void *buf, unsigned int nBytes) { 6393 INTERRUPTIBLE_RETURN_INT(::write(fd, buf, nBytes), os::Solaris::clear_interrupted); 6394} 6395 6396int os::close(int fd) { 6397 RESTARTABLE_RETURN_INT(::close(fd)); 6398} 6399 6400int os::socket_close(int fd) { 6401 RESTARTABLE_RETURN_INT(::close(fd)); 6402} 6403 6404int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 6405 INTERRUPTIBLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags), os::Solaris::clear_interrupted); 6406} 6407 6408int os::send(int fd, char* buf, size_t nBytes, uint flags) { 6409 INTERRUPTIBLE_RETURN_INT((int)::send(fd, buf, nBytes, flags), os::Solaris::clear_interrupted); 6410} 6411 6412int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 6413 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 6414} 6415 6416// As both poll and select can be interrupted by signals, we have to be 6417// prepared to restart the system call after updating the timeout, unless 6418// a poll() is done with timeout == -1, in which case we repeat with this 6419// "wait forever" value. 6420 6421int os::timeout(int fd, long timeout) { 6422 int res; 6423 struct timeval t; 6424 julong prevtime, newtime; 6425 static const char* aNull = 0; 6426 struct pollfd pfd; 6427 pfd.fd = fd; 6428 pfd.events = POLLIN; 6429 6430 gettimeofday(&t, &aNull); 6431 prevtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000; 6432 6433 for(;;) { 6434 INTERRUPTIBLE_NORESTART(::poll(&pfd, 1, timeout), res, os::Solaris::clear_interrupted); 6435 if(res == OS_ERR && errno == EINTR) { 6436 if(timeout != -1) { 6437 gettimeofday(&t, &aNull); 6438 newtime = ((julong)t.tv_sec * 1000) + t.tv_usec /1000; 6439 timeout -= newtime - prevtime; 6440 if(timeout <= 0) 6441 return OS_OK; 6442 prevtime = newtime; 6443 } 6444 } else return res; 6445 } 6446} 6447 6448int os::connect(int fd, struct sockaddr *him, socklen_t len) { 6449 int _result; 6450 INTERRUPTIBLE_NORESTART(::connect(fd, him, len), _result,\ 6451 os::Solaris::clear_interrupted); 6452 6453 // Depending on when thread interruption is reset, _result could be 6454 // one of two values when errno == EINTR 6455 6456 if (((_result == OS_INTRPT) || (_result == OS_ERR)) 6457 && (errno == EINTR)) { 6458 /* restarting a connect() changes its errno semantics */ 6459 INTERRUPTIBLE(::connect(fd, him, len), _result,\ 6460 os::Solaris::clear_interrupted); 6461 /* undo these changes */ 6462 if (_result == OS_ERR) { 6463 if (errno == EALREADY) { 6464 errno = EINPROGRESS; /* fall through */ 6465 } else if (errno == EISCONN) { 6466 errno = 0; 6467 return OS_OK; 6468 } 6469 } 6470 } 6471 return _result; 6472 } 6473 6474int os::accept(int fd, struct sockaddr* him, socklen_t* len) { 6475 if (fd < 0) { 6476 return OS_ERR; 6477 } 6478 INTERRUPTIBLE_RETURN_INT((int)::accept(fd, him, len),\ 6479 os::Solaris::clear_interrupted); 6480} 6481 6482int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags, 6483 sockaddr* from, socklen_t* fromlen) { 6484 INTERRUPTIBLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen),\ 6485 os::Solaris::clear_interrupted); 6486} 6487 6488int os::sendto(int fd, char* buf, size_t len, uint flags, 6489 struct sockaddr* to, socklen_t tolen) { 6490 INTERRUPTIBLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen),\ 6491 os::Solaris::clear_interrupted); 6492} 6493 6494int os::socket_available(int fd, jint *pbytes) { 6495 if (fd < 0) { 6496 return OS_OK; 6497 } 6498 int ret; 6499 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); 6500 // note: ioctl can return 0 when successful, JVM_SocketAvailable 6501 // is expected to return 0 on failure and 1 on success to the jdk. 6502 return (ret == OS_ERR) ? 0 : 1; 6503} 6504 6505int os::bind(int fd, struct sockaddr* him, socklen_t len) { 6506 INTERRUPTIBLE_RETURN_INT_NORESTART(::bind(fd, him, len),\ 6507 os::Solaris::clear_interrupted); 6508} 6509 6510// Get the default path to the core file 6511// Returns the length of the string 6512int os::get_core_path(char* buffer, size_t bufferSize) { 6513 const char* p = get_current_directory(buffer, bufferSize); 6514 6515 if (p == NULL) { 6516 assert(p != NULL, "failed to get current directory"); 6517 return 0; 6518 } 6519 6520 return strlen(buffer); 6521} 6522