os_solaris.cpp revision 1874:22260322f0be
1/* 2 * Copyright (c) 1997, 2010, 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// do not include precompiled header file 26# include "incls/_os_solaris.cpp.incl" 27 28// put OS-includes here 29# include <dlfcn.h> 30# include <errno.h> 31# include <link.h> 32# include <poll.h> 33# include <pthread.h> 34# include <pwd.h> 35# include <schedctl.h> 36# include <setjmp.h> 37# include <signal.h> 38# include <stdio.h> 39# include <alloca.h> 40# include <sys/filio.h> 41# include <sys/ipc.h> 42# include <sys/lwp.h> 43# include <sys/machelf.h> // for elf Sym structure used by dladdr1 44# include <sys/mman.h> 45# include <sys/processor.h> 46# include <sys/procset.h> 47# include <sys/pset.h> 48# include <sys/resource.h> 49# include <sys/shm.h> 50# include <sys/socket.h> 51# include <sys/stat.h> 52# include <sys/systeminfo.h> 53# include <sys/time.h> 54# include <sys/times.h> 55# include <sys/types.h> 56# include <sys/wait.h> 57# include <sys/utsname.h> 58# include <thread.h> 59# include <unistd.h> 60# include <sys/priocntl.h> 61# include <sys/rtpriocntl.h> 62# include <sys/tspriocntl.h> 63# include <sys/iapriocntl.h> 64# include <sys/loadavg.h> 65# include <string.h> 66 67# define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later 68# include <sys/procfs.h> // see comment in <sys/procfs.h> 69 70#define MAX_PATH (2 * K) 71 72// for timer info max values which include all bits 73#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 74 75#ifdef _GNU_SOURCE 76// See bug #6514594 77extern "C" int madvise(caddr_t, size_t, int); 78extern "C" int memcntl(caddr_t addr, size_t len, int cmd, caddr_t arg, 79 int attr, int mask); 80#endif //_GNU_SOURCE 81 82/* 83 MPSS Changes Start. 84 The JVM binary needs to be built and run on pre-Solaris 9 85 systems, but the constants needed by MPSS are only in Solaris 9 86 header files. They are textually replicated here to allow 87 building on earlier systems. Once building on Solaris 8 is 88 no longer a requirement, these #defines can be replaced by ordinary 89 system .h inclusion. 90 91 In earlier versions of the JDK and Solaris, we used ISM for large pages. 92 But ISM requires shared memory to achieve this and thus has many caveats. 93 MPSS is a fully transparent and is a cleaner way to get large pages. 94 Although we still require keeping ISM for backward compatiblitiy as well as 95 giving the opportunity to use large pages on older systems it is 96 recommended that MPSS be used for Solaris 9 and above. 97 98*/ 99 100#ifndef MC_HAT_ADVISE 101 102struct memcntl_mha { 103 uint_t mha_cmd; /* command(s) */ 104 uint_t mha_flags; 105 size_t mha_pagesize; 106}; 107#define MC_HAT_ADVISE 7 /* advise hat map size */ 108#define MHA_MAPSIZE_VA 0x1 /* set preferred page size */ 109#define MAP_ALIGN 0x200 /* addr specifies alignment */ 110 111#endif 112// MPSS Changes End. 113 114 115// Here are some liblgrp types from sys/lgrp_user.h to be able to 116// compile on older systems without this header file. 117 118#ifndef MADV_ACCESS_LWP 119# define MADV_ACCESS_LWP 7 /* next LWP to access heavily */ 120#endif 121#ifndef MADV_ACCESS_MANY 122# define MADV_ACCESS_MANY 8 /* many processes to access heavily */ 123#endif 124 125#ifndef LGRP_RSRC_CPU 126# define LGRP_RSRC_CPU 0 /* CPU resources */ 127#endif 128#ifndef LGRP_RSRC_MEM 129# define LGRP_RSRC_MEM 1 /* memory resources */ 130#endif 131 132// Some more macros from sys/mman.h that are not present in Solaris 8. 133 134#ifndef MAX_MEMINFO_CNT 135/* 136 * info_req request type definitions for meminfo 137 * request types starting with MEMINFO_V are used for Virtual addresses 138 * and should not be mixed with MEMINFO_PLGRP which is targeted for Physical 139 * addresses 140 */ 141# define MEMINFO_SHIFT 16 142# define MEMINFO_MASK (0xFF << MEMINFO_SHIFT) 143# define MEMINFO_VPHYSICAL (0x01 << MEMINFO_SHIFT) /* get physical addr */ 144# define MEMINFO_VLGRP (0x02 << MEMINFO_SHIFT) /* get lgroup */ 145# define MEMINFO_VPAGESIZE (0x03 << MEMINFO_SHIFT) /* size of phys page */ 146# define MEMINFO_VREPLCNT (0x04 << MEMINFO_SHIFT) /* no. of replica */ 147# define MEMINFO_VREPL (0x05 << MEMINFO_SHIFT) /* physical replica */ 148# define MEMINFO_VREPL_LGRP (0x06 << MEMINFO_SHIFT) /* lgrp of replica */ 149# define MEMINFO_PLGRP (0x07 << MEMINFO_SHIFT) /* lgroup for paddr */ 150 151/* maximum number of addresses meminfo() can process at a time */ 152# define MAX_MEMINFO_CNT 256 153 154/* maximum number of request types */ 155# define MAX_MEMINFO_REQ 31 156#endif 157 158// see thr_setprio(3T) for the basis of these numbers 159#define MinimumPriority 0 160#define NormalPriority 64 161#define MaximumPriority 127 162 163// Values for ThreadPriorityPolicy == 1 164int prio_policy1[MaxPriority+1] = { -99999, 0, 16, 32, 48, 64, 165 80, 96, 112, 124, 127 }; 166 167// System parameters used internally 168static clock_t clock_tics_per_sec = 100; 169 170// For diagnostics to print a message once. see run_periodic_checks 171static bool check_addr0_done = false; 172static sigset_t check_signal_done; 173static bool check_signals = true; 174 175address os::Solaris::handler_start; // start pc of thr_sighndlrinfo 176address os::Solaris::handler_end; // end pc of thr_sighndlrinfo 177 178address os::Solaris::_main_stack_base = NULL; // 4352906 workaround 179 180 181// "default" initializers for missing libc APIs 182extern "C" { 183 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 184 static int lwp_mutex_destroy(mutex_t *mx) { return 0; } 185 186 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 187 static int lwp_cond_destroy(cond_t *cv) { return 0; } 188} 189 190// "default" initializers for pthread-based synchronization 191extern "C" { 192 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 193 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 194} 195 196// Thread Local Storage 197// This is common to all Solaris platforms so it is defined here, 198// in this common file. 199// The declarations are in the os_cpu threadLS*.hpp files. 200// 201// Static member initialization for TLS 202Thread* ThreadLocalStorage::_get_thread_cache[ThreadLocalStorage::_pd_cache_size] = {NULL}; 203 204#ifndef PRODUCT 205#define _PCT(n,d) ((100.0*(double)(n))/(double)(d)) 206 207int ThreadLocalStorage::_tcacheHit = 0; 208int ThreadLocalStorage::_tcacheMiss = 0; 209 210void ThreadLocalStorage::print_statistics() { 211 int total = _tcacheMiss+_tcacheHit; 212 tty->print_cr("Thread cache hits %d misses %d total %d percent %f\n", 213 _tcacheHit, _tcacheMiss, total, _PCT(_tcacheHit, total)); 214} 215#undef _PCT 216#endif // PRODUCT 217 218Thread* ThreadLocalStorage::get_thread_via_cache_slowly(uintptr_t raw_id, 219 int index) { 220 Thread *thread = get_thread_slow(); 221 if (thread != NULL) { 222 address sp = os::current_stack_pointer(); 223 guarantee(thread->_stack_base == NULL || 224 (sp <= thread->_stack_base && 225 sp >= thread->_stack_base - thread->_stack_size) || 226 is_error_reported(), 227 "sp must be inside of selected thread stack"); 228 229 thread->_self_raw_id = raw_id; // mark for quick retrieval 230 _get_thread_cache[ index ] = thread; 231 } 232 return thread; 233} 234 235 236static const double all_zero[ sizeof(Thread) / sizeof(double) + 1 ] = {0}; 237#define NO_CACHED_THREAD ((Thread*)all_zero) 238 239void ThreadLocalStorage::pd_set_thread(Thread* thread) { 240 241 // Store the new value before updating the cache to prevent a race 242 // between get_thread_via_cache_slowly() and this store operation. 243 os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread); 244 245 // Update thread cache with new thread if setting on thread create, 246 // or NO_CACHED_THREAD (zeroed) thread if resetting thread on exit. 247 uintptr_t raw = pd_raw_thread_id(); 248 int ix = pd_cache_index(raw); 249 _get_thread_cache[ix] = thread == NULL ? NO_CACHED_THREAD : thread; 250} 251 252void ThreadLocalStorage::pd_init() { 253 for (int i = 0; i < _pd_cache_size; i++) { 254 _get_thread_cache[i] = NO_CACHED_THREAD; 255 } 256} 257 258// Invalidate all the caches (happens to be the same as pd_init). 259void ThreadLocalStorage::pd_invalidate_all() { pd_init(); } 260 261#undef NO_CACHED_THREAD 262 263// END Thread Local Storage 264 265static inline size_t adjust_stack_size(address base, size_t size) { 266 if ((ssize_t)size < 0) { 267 // 4759953: Compensate for ridiculous stack size. 268 size = max_intx; 269 } 270 if (size > (size_t)base) { 271 // 4812466: Make sure size doesn't allow the stack to wrap the address space. 272 size = (size_t)base; 273 } 274 return size; 275} 276 277static inline stack_t get_stack_info() { 278 stack_t st; 279 int retval = thr_stksegment(&st); 280 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size); 281 assert(retval == 0, "incorrect return value from thr_stksegment"); 282 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 283 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 284 return st; 285} 286 287address os::current_stack_base() { 288 int r = thr_main() ; 289 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ; 290 bool is_primordial_thread = r; 291 292 // Workaround 4352906, avoid calls to thr_stksegment by 293 // thr_main after the first one (it looks like we trash 294 // some data, causing the value for ss_sp to be incorrect). 295 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) { 296 stack_t st = get_stack_info(); 297 if (is_primordial_thread) { 298 // cache initial value of stack base 299 os::Solaris::_main_stack_base = (address)st.ss_sp; 300 } 301 return (address)st.ss_sp; 302 } else { 303 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base"); 304 return os::Solaris::_main_stack_base; 305 } 306} 307 308size_t os::current_stack_size() { 309 size_t size; 310 311 int r = thr_main() ; 312 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ; 313 if(!r) { 314 size = get_stack_info().ss_size; 315 } else { 316 struct rlimit limits; 317 getrlimit(RLIMIT_STACK, &limits); 318 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur); 319 } 320 // base may not be page aligned 321 address base = current_stack_base(); 322 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());; 323 return (size_t)(base - bottom); 324} 325 326struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 327 return localtime_r(clock, res); 328} 329 330// interruptible infrastructure 331 332// setup_interruptible saves the thread state before going into an 333// interruptible system call. 334// The saved state is used to restore the thread to 335// its former state whether or not an interrupt is received. 336// Used by classloader os::read 337// hpi calls skip this layer and stay in _thread_in_native 338 339void os::Solaris::setup_interruptible(JavaThread* thread) { 340 341 JavaThreadState thread_state = thread->thread_state(); 342 343 assert(thread_state != _thread_blocked, "Coming from the wrong thread"); 344 assert(thread_state != _thread_in_native, "Native threads skip setup_interruptible"); 345 OSThread* osthread = thread->osthread(); 346 osthread->set_saved_interrupt_thread_state(thread_state); 347 thread->frame_anchor()->make_walkable(thread); 348 ThreadStateTransition::transition(thread, thread_state, _thread_blocked); 349} 350 351// Version of setup_interruptible() for threads that are already in 352// _thread_blocked. Used by os_sleep(). 353void os::Solaris::setup_interruptible_already_blocked(JavaThread* thread) { 354 thread->frame_anchor()->make_walkable(thread); 355} 356 357JavaThread* os::Solaris::setup_interruptible() { 358 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread(); 359 setup_interruptible(thread); 360 return thread; 361} 362 363void os::Solaris::try_enable_extended_io() { 364 typedef int (*enable_extended_FILE_stdio_t)(int, int); 365 366 if (!UseExtendedFileIO) { 367 return; 368 } 369 370 enable_extended_FILE_stdio_t enabler = 371 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT, 372 "enable_extended_FILE_stdio"); 373 if (enabler) { 374 enabler(-1, -1); 375 } 376} 377 378 379#ifdef ASSERT 380 381JavaThread* os::Solaris::setup_interruptible_native() { 382 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread(); 383 JavaThreadState thread_state = thread->thread_state(); 384 assert(thread_state == _thread_in_native, "Assumed thread_in_native"); 385 return thread; 386} 387 388void os::Solaris::cleanup_interruptible_native(JavaThread* thread) { 389 JavaThreadState thread_state = thread->thread_state(); 390 assert(thread_state == _thread_in_native, "Assumed thread_in_native"); 391} 392#endif 393 394// cleanup_interruptible reverses the effects of setup_interruptible 395// setup_interruptible_already_blocked() does not need any cleanup. 396 397void os::Solaris::cleanup_interruptible(JavaThread* thread) { 398 OSThread* osthread = thread->osthread(); 399 400 ThreadStateTransition::transition(thread, _thread_blocked, osthread->saved_interrupt_thread_state()); 401} 402 403// I/O interruption related counters called in _INTERRUPTIBLE 404 405void os::Solaris::bump_interrupted_before_count() { 406 RuntimeService::record_interrupted_before_count(); 407} 408 409void os::Solaris::bump_interrupted_during_count() { 410 RuntimeService::record_interrupted_during_count(); 411} 412 413static int _processors_online = 0; 414 415 jint os::Solaris::_os_thread_limit = 0; 416volatile jint os::Solaris::_os_thread_count = 0; 417 418julong os::available_memory() { 419 return Solaris::available_memory(); 420} 421 422julong os::Solaris::available_memory() { 423 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size(); 424} 425 426julong os::Solaris::_physical_memory = 0; 427 428julong os::physical_memory() { 429 return Solaris::physical_memory(); 430} 431 432julong os::allocatable_physical_memory(julong size) { 433#ifdef _LP64 434 return size; 435#else 436 julong result = MIN2(size, (julong)3835*M); 437 if (!is_allocatable(result)) { 438 // Memory allocations will be aligned but the alignment 439 // is not known at this point. Alignments will 440 // be at most to LargePageSizeInBytes. Protect 441 // allocations from alignments up to illegal 442 // values. If at this point 2G is illegal. 443 julong reasonable_size = (julong)2*G - 2 * LargePageSizeInBytes; 444 result = MIN2(size, reasonable_size); 445 } 446 return result; 447#endif 448} 449 450static hrtime_t first_hrtime = 0; 451static const hrtime_t hrtime_hz = 1000*1000*1000; 452const int LOCK_BUSY = 1; 453const int LOCK_FREE = 0; 454const int LOCK_INVALID = -1; 455static volatile hrtime_t max_hrtime = 0; 456static volatile int max_hrtime_lock = LOCK_FREE; // Update counter with LSB as lock-in-progress 457 458 459void os::Solaris::initialize_system_info() { 460 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); 461 _processors_online = sysconf (_SC_NPROCESSORS_ONLN); 462 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE); 463} 464 465int os::active_processor_count() { 466 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 467 pid_t pid = getpid(); 468 psetid_t pset = PS_NONE; 469 // Are we running in a processor set or is there any processor set around? 470 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) { 471 uint_t pset_cpus; 472 // Query the number of cpus available to us. 473 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) { 474 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check"); 475 _processors_online = pset_cpus; 476 return pset_cpus; 477 } 478 } 479 // Otherwise return number of online cpus 480 return online_cpus; 481} 482 483static bool find_processors_in_pset(psetid_t pset, 484 processorid_t** id_array, 485 uint_t* id_length) { 486 bool result = false; 487 // Find the number of processors in the processor set. 488 if (pset_info(pset, NULL, id_length, NULL) == 0) { 489 // Make up an array to hold their ids. 490 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length); 491 // Fill in the array with their processor ids. 492 if (pset_info(pset, NULL, id_length, *id_array) == 0) { 493 result = true; 494 } 495 } 496 return result; 497} 498 499// Callers of find_processors_online() must tolerate imprecise results -- 500// the system configuration can change asynchronously because of DR 501// or explicit psradm operations. 502// 503// We also need to take care that the loop (below) terminates as the 504// number of processors online can change between the _SC_NPROCESSORS_ONLN 505// request and the loop that builds the list of processor ids. Unfortunately 506// there's no reliable way to determine the maximum valid processor id, 507// so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online 508// man pages, which claim the processor id set is "sparse, but 509// not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually 510// exit the loop. 511// 512// In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's 513// not available on S8.0. 514 515static bool find_processors_online(processorid_t** id_array, 516 uint* id_length) { 517 const processorid_t MAX_PROCESSOR_ID = 100000 ; 518 // Find the number of processors online. 519 *id_length = sysconf(_SC_NPROCESSORS_ONLN); 520 // Make up an array to hold their ids. 521 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length); 522 // Processors need not be numbered consecutively. 523 long found = 0; 524 processorid_t next = 0; 525 while (found < *id_length && next < MAX_PROCESSOR_ID) { 526 processor_info_t info; 527 if (processor_info(next, &info) == 0) { 528 // NB, PI_NOINTR processors are effectively online ... 529 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) { 530 (*id_array)[found] = next; 531 found += 1; 532 } 533 } 534 next += 1; 535 } 536 if (found < *id_length) { 537 // The loop above didn't identify the expected number of processors. 538 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN) 539 // and re-running the loop, above, but there's no guarantee of progress 540 // if the system configuration is in flux. Instead, we just return what 541 // we've got. Note that in the worst case find_processors_online() could 542 // return an empty set. (As a fall-back in the case of the empty set we 543 // could just return the ID of the current processor). 544 *id_length = found ; 545 } 546 547 return true; 548} 549 550static bool assign_distribution(processorid_t* id_array, 551 uint id_length, 552 uint* distribution, 553 uint distribution_length) { 554 // We assume we can assign processorid_t's to uint's. 555 assert(sizeof(processorid_t) == sizeof(uint), 556 "can't convert processorid_t to uint"); 557 // Quick check to see if we won't succeed. 558 if (id_length < distribution_length) { 559 return false; 560 } 561 // Assign processor ids to the distribution. 562 // Try to shuffle processors to distribute work across boards, 563 // assuming 4 processors per board. 564 const uint processors_per_board = ProcessDistributionStride; 565 // Find the maximum processor id. 566 processorid_t max_id = 0; 567 for (uint m = 0; m < id_length; m += 1) { 568 max_id = MAX2(max_id, id_array[m]); 569 } 570 // The next id, to limit loops. 571 const processorid_t limit_id = max_id + 1; 572 // Make up markers for available processors. 573 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id); 574 for (uint c = 0; c < limit_id; c += 1) { 575 available_id[c] = false; 576 } 577 for (uint a = 0; a < id_length; a += 1) { 578 available_id[id_array[a]] = true; 579 } 580 // Step by "boards", then by "slot", copying to "assigned". 581 // NEEDS_CLEANUP: The assignment of processors should be stateful, 582 // remembering which processors have been assigned by 583 // previous calls, etc., so as to distribute several 584 // independent calls of this method. What we'd like is 585 // It would be nice to have an API that let us ask 586 // how many processes are bound to a processor, 587 // but we don't have that, either. 588 // In the short term, "board" is static so that 589 // subsequent distributions don't all start at board 0. 590 static uint board = 0; 591 uint assigned = 0; 592 // Until we've found enough processors .... 593 while (assigned < distribution_length) { 594 // ... find the next available processor in the board. 595 for (uint slot = 0; slot < processors_per_board; slot += 1) { 596 uint try_id = board * processors_per_board + slot; 597 if ((try_id < limit_id) && (available_id[try_id] == true)) { 598 distribution[assigned] = try_id; 599 available_id[try_id] = false; 600 assigned += 1; 601 break; 602 } 603 } 604 board += 1; 605 if (board * processors_per_board + 0 >= limit_id) { 606 board = 0; 607 } 608 } 609 if (available_id != NULL) { 610 FREE_C_HEAP_ARRAY(bool, available_id); 611 } 612 return true; 613} 614 615bool os::distribute_processes(uint length, uint* distribution) { 616 bool result = false; 617 // Find the processor id's of all the available CPUs. 618 processorid_t* id_array = NULL; 619 uint id_length = 0; 620 // There are some races between querying information and using it, 621 // since processor sets can change dynamically. 622 psetid_t pset = PS_NONE; 623 // Are we running in a processor set? 624 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) { 625 result = find_processors_in_pset(pset, &id_array, &id_length); 626 } else { 627 result = find_processors_online(&id_array, &id_length); 628 } 629 if (result == true) { 630 if (id_length >= length) { 631 result = assign_distribution(id_array, id_length, distribution, length); 632 } else { 633 result = false; 634 } 635 } 636 if (id_array != NULL) { 637 FREE_C_HEAP_ARRAY(processorid_t, id_array); 638 } 639 return result; 640} 641 642bool os::bind_to_processor(uint processor_id) { 643 // We assume that a processorid_t can be stored in a uint. 644 assert(sizeof(uint) == sizeof(processorid_t), 645 "can't convert uint to processorid_t"); 646 int bind_result = 647 processor_bind(P_LWPID, // bind LWP. 648 P_MYID, // bind current LWP. 649 (processorid_t) processor_id, // id. 650 NULL); // don't return old binding. 651 return (bind_result == 0); 652} 653 654bool os::getenv(const char* name, char* buffer, int len) { 655 char* val = ::getenv( name ); 656 if ( val == NULL 657 || strlen(val) + 1 > len ) { 658 if (len > 0) buffer[0] = 0; // return a null string 659 return false; 660 } 661 strcpy( buffer, val ); 662 return true; 663} 664 665 666// Return true if user is running as root. 667 668bool os::have_special_privileges() { 669 static bool init = false; 670 static bool privileges = false; 671 if (!init) { 672 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 673 init = true; 674 } 675 return privileges; 676} 677 678 679void os::init_system_properties_values() { 680 char arch[12]; 681 sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); 682 683 // The next steps are taken in the product version: 684 // 685 // Obtain the JAVA_HOME value from the location of libjvm[_g].so. 686 // This library should be located at: 687 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm[_g].so. 688 // 689 // If "/jre/lib/" appears at the right place in the path, then we 690 // assume libjvm[_g].so is installed in a JDK and we use this path. 691 // 692 // Otherwise exit with message: "Could not create the Java virtual machine." 693 // 694 // The following extra steps are taken in the debugging version: 695 // 696 // If "/jre/lib/" does NOT appear at the right place in the path 697 // instead of exit check for $JAVA_HOME environment variable. 698 // 699 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 700 // then we append a fake suffix "hotspot/libjvm[_g].so" to this path so 701 // it looks like libjvm[_g].so is installed there 702 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm[_g].so. 703 // 704 // Otherwise exit. 705 // 706 // Important note: if the location of libjvm.so changes this 707 // code needs to be changed accordingly. 708 709 // The next few definitions allow the code to be verbatim: 710#define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n)) 711#define free(p) FREE_C_HEAP_ARRAY(char, p) 712#define getenv(n) ::getenv(n) 713 714#define EXTENSIONS_DIR "/lib/ext" 715#define ENDORSED_DIR "/lib/endorsed" 716#define COMMON_DIR "/usr/jdk/packages" 717 718 { 719 /* sysclasspath, java_home, dll_dir */ 720 { 721 char *home_path; 722 char *dll_path; 723 char *pslash; 724 char buf[MAXPATHLEN]; 725 os::jvm_path(buf, sizeof(buf)); 726 727 // Found the full path to libjvm.so. 728 // Now cut the path to <java_home>/jre if we can. 729 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ 730 pslash = strrchr(buf, '/'); 731 if (pslash != NULL) 732 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ 733 dll_path = malloc(strlen(buf) + 1); 734 if (dll_path == NULL) 735 return; 736 strcpy(dll_path, buf); 737 Arguments::set_dll_dir(dll_path); 738 739 if (pslash != NULL) { 740 pslash = strrchr(buf, '/'); 741 if (pslash != NULL) { 742 *pslash = '\0'; /* get rid of /<arch> */ 743 pslash = strrchr(buf, '/'); 744 if (pslash != NULL) 745 *pslash = '\0'; /* get rid of /lib */ 746 } 747 } 748 749 home_path = malloc(strlen(buf) + 1); 750 if (home_path == NULL) 751 return; 752 strcpy(home_path, buf); 753 Arguments::set_java_home(home_path); 754 755 if (!set_boot_path('/', ':')) 756 return; 757 } 758 759 /* 760 * Where to look for native libraries 761 */ 762 { 763 // Use dlinfo() to determine the correct java.library.path. 764 // 765 // If we're launched by the Java launcher, and the user 766 // does not set java.library.path explicitly on the commandline, 767 // the Java launcher sets LD_LIBRARY_PATH for us and unsets 768 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case 769 // dlinfo returns LD_LIBRARY_PATH + crle settings (including 770 // /usr/lib), which is exactly what we want. 771 // 772 // If the user does set java.library.path, it completely 773 // overwrites this setting, and always has. 774 // 775 // If we're not launched by the Java launcher, we may 776 // get here with any/all of the LD_LIBRARY_PATH[_32|64] 777 // settings. Again, dlinfo does exactly what we want. 778 779 Dl_serinfo _info, *info = &_info; 780 Dl_serpath *path; 781 char* library_path; 782 char *common_path; 783 int i; 784 785 // determine search path count and required buffer size 786 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) { 787 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror()); 788 } 789 790 // allocate new buffer and initialize 791 info = (Dl_serinfo*)malloc(_info.dls_size); 792 if (info == NULL) { 793 vm_exit_out_of_memory(_info.dls_size, 794 "init_system_properties_values info"); 795 } 796 info->dls_size = _info.dls_size; 797 info->dls_cnt = _info.dls_cnt; 798 799 // obtain search path information 800 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) { 801 free(info); 802 vm_exit_during_initialization("dlinfo SERINFO request", dlerror()); 803 } 804 805 path = &info->dls_serpath[0]; 806 807 // Note: Due to a legacy implementation, most of the library path 808 // is set in the launcher. This was to accomodate linking restrictions 809 // on legacy Solaris implementations (which are no longer supported). 810 // Eventually, all the library path setting will be done here. 811 // 812 // However, to prevent the proliferation of improperly built native 813 // libraries, the new path component /usr/jdk/packages is added here. 814 815 // Determine the actual CPU architecture. 816 char cpu_arch[12]; 817 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 818#ifdef _LP64 819 // If we are a 64-bit vm, perform the following translations: 820 // sparc -> sparcv9 821 // i386 -> amd64 822 if (strcmp(cpu_arch, "sparc") == 0) 823 strcat(cpu_arch, "v9"); 824 else if (strcmp(cpu_arch, "i386") == 0) 825 strcpy(cpu_arch, "amd64"); 826#endif 827 828 // Construct the invariant part of ld_library_path. Note that the 829 // space for the colon and the trailing null are provided by the 830 // nulls included by the sizeof operator. 831 size_t bufsize = sizeof(COMMON_DIR) + sizeof("/lib/") + strlen(cpu_arch); 832 common_path = malloc(bufsize); 833 if (common_path == NULL) { 834 free(info); 835 vm_exit_out_of_memory(bufsize, 836 "init_system_properties_values common_path"); 837 } 838 sprintf(common_path, COMMON_DIR "/lib/%s", cpu_arch); 839 840 // struct size is more than sufficient for the path components obtained 841 // through the dlinfo() call, so only add additional space for the path 842 // components explicitly added here. 843 bufsize = info->dls_size + strlen(common_path); 844 library_path = malloc(bufsize); 845 if (library_path == NULL) { 846 free(info); 847 free(common_path); 848 vm_exit_out_of_memory(bufsize, 849 "init_system_properties_values library_path"); 850 } 851 library_path[0] = '\0'; 852 853 // Construct the desired Java library path from the linker's library 854 // search path. 855 // 856 // For compatibility, it is optimal that we insert the additional path 857 // components specific to the Java VM after those components specified 858 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so 859 // infrastructure. 860 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it 861 strcpy(library_path, common_path); 862 } else { 863 int inserted = 0; 864 for (i = 0; i < info->dls_cnt; i++, path++) { 865 uint_t flags = path->dls_flags & LA_SER_MASK; 866 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) { 867 strcat(library_path, common_path); 868 strcat(library_path, os::path_separator()); 869 inserted = 1; 870 } 871 strcat(library_path, path->dls_name); 872 strcat(library_path, os::path_separator()); 873 } 874 // eliminate trailing path separator 875 library_path[strlen(library_path)-1] = '\0'; 876 } 877 878 // happens before argument parsing - can't use a trace flag 879 // tty->print_raw("init_system_properties_values: native lib path: "); 880 // tty->print_raw_cr(library_path); 881 882 // callee copies into its own buffer 883 Arguments::set_library_path(library_path); 884 885 free(common_path); 886 free(library_path); 887 free(info); 888 } 889 890 /* 891 * Extensions directories. 892 * 893 * Note that the space for the colon and the trailing null are provided 894 * by the nulls included by the sizeof operator (so actually one byte more 895 * than necessary is allocated). 896 */ 897 { 898 char *buf = (char *) malloc(strlen(Arguments::get_java_home()) + 899 sizeof(EXTENSIONS_DIR) + sizeof(COMMON_DIR) + 900 sizeof(EXTENSIONS_DIR)); 901 sprintf(buf, "%s" EXTENSIONS_DIR ":" COMMON_DIR EXTENSIONS_DIR, 902 Arguments::get_java_home()); 903 Arguments::set_ext_dirs(buf); 904 } 905 906 /* Endorsed standards default directory. */ 907 { 908 char * buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); 909 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); 910 Arguments::set_endorsed_dirs(buf); 911 } 912 } 913 914#undef malloc 915#undef free 916#undef getenv 917#undef EXTENSIONS_DIR 918#undef ENDORSED_DIR 919#undef COMMON_DIR 920 921} 922 923void os::breakpoint() { 924 BREAKPOINT; 925} 926 927bool os::obsolete_option(const JavaVMOption *option) 928{ 929 if (!strncmp(option->optionString, "-Xt", 3)) { 930 return true; 931 } else if (!strncmp(option->optionString, "-Xtm", 4)) { 932 return true; 933 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) { 934 return true; 935 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) { 936 return true; 937 } 938 return false; 939} 940 941bool os::Solaris::valid_stack_address(Thread* thread, address sp) { 942 address stackStart = (address)thread->stack_base(); 943 address stackEnd = (address)(stackStart - (address)thread->stack_size()); 944 if (sp < stackStart && sp >= stackEnd ) return true; 945 return false; 946} 947 948extern "C" void breakpoint() { 949 // use debugger to set breakpoint here 950} 951 952// Returns an estimate of the current stack pointer. Result must be guaranteed to 953// point into the calling threads stack, and be no lower than the current stack 954// pointer. 955address os::current_stack_pointer() { 956 volatile int dummy; 957 address sp = (address)&dummy + 8; // %%%% need to confirm if this is right 958 return sp; 959} 960 961static thread_t main_thread; 962 963// Thread start routine for all new Java threads 964extern "C" void* java_start(void* thread_addr) { 965 // Try to randomize the cache line index of hot stack frames. 966 // This helps when threads of the same stack traces evict each other's 967 // cache lines. The threads can be either from the same JVM instance, or 968 // from different JVM instances. The benefit is especially true for 969 // processors with hyperthreading technology. 970 static int counter = 0; 971 int pid = os::current_process_id(); 972 alloca(((pid ^ counter++) & 7) * 128); 973 974 int prio; 975 Thread* thread = (Thread*)thread_addr; 976 OSThread* osthr = thread->osthread(); 977 978 osthr->set_lwp_id( _lwp_self() ); // Store lwp in case we are bound 979 thread->_schedctl = (void *) schedctl_init () ; 980 981 if (UseNUMA) { 982 int lgrp_id = os::numa_get_group_id(); 983 if (lgrp_id != -1) { 984 thread->set_lgrp_id(lgrp_id); 985 } 986 } 987 988 // If the creator called set priority before we started, 989 // we need to call set priority now that we have an lwp. 990 // Get the priority from libthread and set the priority 991 // for the new Solaris lwp. 992 if ( osthr->thread_id() != -1 ) { 993 if ( UseThreadPriorities ) { 994 thr_getprio(osthr->thread_id(), &prio); 995 if (ThreadPriorityVerbose) { 996 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT ", setting priority: %d\n", 997 osthr->thread_id(), osthr->lwp_id(), prio ); 998 } 999 os::set_native_priority(thread, prio); 1000 } 1001 } else if (ThreadPriorityVerbose) { 1002 warning("Can't set priority in _start routine, thread id hasn't been set\n"); 1003 } 1004 1005 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 1006 1007 // initialize signal mask for this thread 1008 os::Solaris::hotspot_sigmask(thread); 1009 1010 thread->run(); 1011 1012 // One less thread is executing 1013 // When the VMThread gets here, the main thread may have already exited 1014 // which frees the CodeHeap containing the Atomic::dec code 1015 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 1016 Atomic::dec(&os::Solaris::_os_thread_count); 1017 } 1018 1019 if (UseDetachedThreads) { 1020 thr_exit(NULL); 1021 ShouldNotReachHere(); 1022 } 1023 return NULL; 1024} 1025 1026static OSThread* create_os_thread(Thread* thread, thread_t thread_id) { 1027 // Allocate the OSThread object 1028 OSThread* osthread = new OSThread(NULL, NULL); 1029 if (osthread == NULL) return NULL; 1030 1031 // Store info on the Solaris thread into the OSThread 1032 osthread->set_thread_id(thread_id); 1033 osthread->set_lwp_id(_lwp_self()); 1034 thread->_schedctl = (void *) schedctl_init () ; 1035 1036 if (UseNUMA) { 1037 int lgrp_id = os::numa_get_group_id(); 1038 if (lgrp_id != -1) { 1039 thread->set_lgrp_id(lgrp_id); 1040 } 1041 } 1042 1043 if ( ThreadPriorityVerbose ) { 1044 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n", 1045 osthread->thread_id(), osthread->lwp_id() ); 1046 } 1047 1048 // Initial thread state is INITIALIZED, not SUSPENDED 1049 osthread->set_state(INITIALIZED); 1050 1051 return osthread; 1052} 1053 1054void os::Solaris::hotspot_sigmask(Thread* thread) { 1055 1056 //Save caller's signal mask 1057 sigset_t sigmask; 1058 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask); 1059 OSThread *osthread = thread->osthread(); 1060 osthread->set_caller_sigmask(sigmask); 1061 1062 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL); 1063 if (!ReduceSignalUsage) { 1064 if (thread->is_VM_thread()) { 1065 // Only the VM thread handles BREAK_SIGNAL ... 1066 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL); 1067 } else { 1068 // ... all other threads block BREAK_SIGNAL 1069 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked"); 1070 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL); 1071 } 1072 } 1073} 1074 1075bool os::create_attached_thread(JavaThread* thread) { 1076#ifdef ASSERT 1077 thread->verify_not_published(); 1078#endif 1079 OSThread* osthread = create_os_thread(thread, thr_self()); 1080 if (osthread == NULL) { 1081 return false; 1082 } 1083 1084 // Initial thread state is RUNNABLE 1085 osthread->set_state(RUNNABLE); 1086 thread->set_osthread(osthread); 1087 1088 // initialize signal mask for this thread 1089 // and save the caller's signal mask 1090 os::Solaris::hotspot_sigmask(thread); 1091 1092 return true; 1093} 1094 1095bool os::create_main_thread(JavaThread* thread) { 1096#ifdef ASSERT 1097 thread->verify_not_published(); 1098#endif 1099 if (_starting_thread == NULL) { 1100 _starting_thread = create_os_thread(thread, main_thread); 1101 if (_starting_thread == NULL) { 1102 return false; 1103 } 1104 } 1105 1106 // The primodial thread is runnable from the start 1107 _starting_thread->set_state(RUNNABLE); 1108 1109 thread->set_osthread(_starting_thread); 1110 1111 // initialize signal mask for this thread 1112 // and save the caller's signal mask 1113 os::Solaris::hotspot_sigmask(thread); 1114 1115 return true; 1116} 1117 1118// _T2_libthread is true if we believe we are running with the newer 1119// SunSoft lwp/libthread.so (2.8 patch, 2.9 default) 1120bool os::Solaris::_T2_libthread = false; 1121 1122bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 1123 // Allocate the OSThread object 1124 OSThread* osthread = new OSThread(NULL, NULL); 1125 if (osthread == NULL) { 1126 return false; 1127 } 1128 1129 if ( ThreadPriorityVerbose ) { 1130 char *thrtyp; 1131 switch ( thr_type ) { 1132 case vm_thread: 1133 thrtyp = (char *)"vm"; 1134 break; 1135 case cgc_thread: 1136 thrtyp = (char *)"cgc"; 1137 break; 1138 case pgc_thread: 1139 thrtyp = (char *)"pgc"; 1140 break; 1141 case java_thread: 1142 thrtyp = (char *)"java"; 1143 break; 1144 case compiler_thread: 1145 thrtyp = (char *)"compiler"; 1146 break; 1147 case watcher_thread: 1148 thrtyp = (char *)"watcher"; 1149 break; 1150 default: 1151 thrtyp = (char *)"unknown"; 1152 break; 1153 } 1154 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp); 1155 } 1156 1157 // Calculate stack size if it's not specified by caller. 1158 if (stack_size == 0) { 1159 // The default stack size 1M (2M for LP64). 1160 stack_size = (BytesPerWord >> 2) * K * K; 1161 1162 switch (thr_type) { 1163 case os::java_thread: 1164 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 1165 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create(); 1166 break; 1167 case os::compiler_thread: 1168 if (CompilerThreadStackSize > 0) { 1169 stack_size = (size_t)(CompilerThreadStackSize * K); 1170 break; 1171 } // else fall through: 1172 // use VMThreadStackSize if CompilerThreadStackSize is not defined 1173 case os::vm_thread: 1174 case os::pgc_thread: 1175 case os::cgc_thread: 1176 case os::watcher_thread: 1177 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 1178 break; 1179 } 1180 } 1181 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed); 1182 1183 // Initial state is ALLOCATED but not INITIALIZED 1184 osthread->set_state(ALLOCATED); 1185 1186 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) { 1187 // We got lots of threads. Check if we still have some address space left. 1188 // Need to be at least 5Mb of unreserved address space. We do check by 1189 // trying to reserve some. 1190 const size_t VirtualMemoryBangSize = 20*K*K; 1191 char* mem = os::reserve_memory(VirtualMemoryBangSize); 1192 if (mem == NULL) { 1193 delete osthread; 1194 return false; 1195 } else { 1196 // Release the memory again 1197 os::release_memory(mem, VirtualMemoryBangSize); 1198 } 1199 } 1200 1201 // Setup osthread because the child thread may need it. 1202 thread->set_osthread(osthread); 1203 1204 // Create the Solaris thread 1205 // explicit THR_BOUND for T2_libthread case in case 1206 // that assumption is not accurate, but our alternate signal stack 1207 // handling is based on it which must have bound threads 1208 thread_t tid = 0; 1209 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED 1210 | ((UseBoundThreads || os::Solaris::T2_libthread() || 1211 (thr_type == vm_thread) || 1212 (thr_type == cgc_thread) || 1213 (thr_type == pgc_thread) || 1214 (thr_type == compiler_thread && BackgroundCompilation)) ? 1215 THR_BOUND : 0); 1216 int status; 1217 1218 // 4376845 -- libthread/kernel don't provide enough LWPs to utilize all CPUs. 1219 // 1220 // On multiprocessors systems, libthread sometimes under-provisions our 1221 // process with LWPs. On a 30-way systems, for instance, we could have 1222 // 50 user-level threads in ready state and only 2 or 3 LWPs assigned 1223 // to our process. This can result in under utilization of PEs. 1224 // I suspect the problem is related to libthread's LWP 1225 // pool management and to the kernel's SIGBLOCKING "last LWP parked" 1226 // upcall policy. 1227 // 1228 // The following code is palliative -- it attempts to ensure that our 1229 // process has sufficient LWPs to take advantage of multiple PEs. 1230 // Proper long-term cures include using user-level threads bound to LWPs 1231 // (THR_BOUND) or using LWP-based synchronization. Note that there is a 1232 // slight timing window with respect to sampling _os_thread_count, but 1233 // the race is benign. Also, we should periodically recompute 1234 // _processors_online as the min of SC_NPROCESSORS_ONLN and the 1235 // the number of PEs in our partition. You might be tempted to use 1236 // THR_NEW_LWP here, but I'd recommend against it as that could 1237 // result in undesirable growth of the libthread's LWP pool. 1238 // The fix below isn't sufficient; for instance, it doesn't take into count 1239 // LWPs parked on IO. It does, however, help certain CPU-bound benchmarks. 1240 // 1241 // Some pathologies this scheme doesn't handle: 1242 // * Threads can block, releasing the LWPs. The LWPs can age out. 1243 // When a large number of threads become ready again there aren't 1244 // enough LWPs available to service them. This can occur when the 1245 // number of ready threads oscillates. 1246 // * LWPs/Threads park on IO, thus taking the LWP out of circulation. 1247 // 1248 // Finally, we should call thr_setconcurrency() periodically to refresh 1249 // the LWP pool and thwart the LWP age-out mechanism. 1250 // The "+3" term provides a little slop -- we want to slightly overprovision. 1251 1252 if (AdjustConcurrency && os::Solaris::_os_thread_count < (_processors_online+3)) { 1253 if (!(flags & THR_BOUND)) { 1254 thr_setconcurrency (os::Solaris::_os_thread_count); // avoid starvation 1255 } 1256 } 1257 // Although this doesn't hurt, we should warn of undefined behavior 1258 // when using unbound T1 threads with schedctl(). This should never 1259 // happen, as the compiler and VM threads are always created bound 1260 DEBUG_ONLY( 1261 if ((VMThreadHintNoPreempt || CompilerThreadHintNoPreempt) && 1262 (!os::Solaris::T2_libthread() && (!(flags & THR_BOUND))) && 1263 ((thr_type == vm_thread) || (thr_type == cgc_thread) || 1264 (thr_type == pgc_thread) || (thr_type == compiler_thread && BackgroundCompilation))) { 1265 warning("schedctl behavior undefined when Compiler/VM/GC Threads are Unbound"); 1266 } 1267 ); 1268 1269 1270 // Mark that we don't have an lwp or thread id yet. 1271 // In case we attempt to set the priority before the thread starts. 1272 osthread->set_lwp_id(-1); 1273 osthread->set_thread_id(-1); 1274 1275 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid); 1276 if (status != 0) { 1277 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1278 perror("os::create_thread"); 1279 } 1280 thread->set_osthread(NULL); 1281 // Need to clean up stuff we've allocated so far 1282 delete osthread; 1283 return false; 1284 } 1285 1286 Atomic::inc(&os::Solaris::_os_thread_count); 1287 1288 // Store info on the Solaris thread into the OSThread 1289 osthread->set_thread_id(tid); 1290 1291 // Remember that we created this thread so we can set priority on it 1292 osthread->set_vm_created(); 1293 1294 // Set the default thread priority otherwise use NormalPriority 1295 1296 if ( UseThreadPriorities ) { 1297 thr_setprio(tid, (DefaultThreadPriority == -1) ? 1298 java_to_os_priority[NormPriority] : 1299 DefaultThreadPriority); 1300 } 1301 1302 // Initial thread state is INITIALIZED, not SUSPENDED 1303 osthread->set_state(INITIALIZED); 1304 1305 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 1306 return true; 1307} 1308 1309/* defined for >= Solaris 10. This allows builds on earlier versions 1310 * of Solaris to take advantage of the newly reserved Solaris JVM signals 1311 * With SIGJVM1, SIGJVM2, INTERRUPT_SIGNAL is SIGJVM1, ASYNC_SIGNAL is SIGJVM2 1312 * and -XX:+UseAltSigs does nothing since these should have no conflict 1313 */ 1314#if !defined(SIGJVM1) 1315#define SIGJVM1 39 1316#define SIGJVM2 40 1317#endif 1318 1319debug_only(static bool signal_sets_initialized = false); 1320static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 1321int os::Solaris::_SIGinterrupt = INTERRUPT_SIGNAL; 1322int os::Solaris::_SIGasync = ASYNC_SIGNAL; 1323 1324bool os::Solaris::is_sig_ignored(int sig) { 1325 struct sigaction oact; 1326 sigaction(sig, (struct sigaction*)NULL, &oact); 1327 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 1328 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 1329 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) 1330 return true; 1331 else 1332 return false; 1333} 1334 1335// Note: SIGRTMIN is a macro that calls sysconf() so it will 1336// dynamically detect SIGRTMIN value for the system at runtime, not buildtime 1337static bool isJVM1available() { 1338 return SIGJVM1 < SIGRTMIN; 1339} 1340 1341void os::Solaris::signal_sets_init() { 1342 // Should also have an assertion stating we are still single-threaded. 1343 assert(!signal_sets_initialized, "Already initialized"); 1344 // Fill in signals that are necessarily unblocked for all threads in 1345 // the VM. Currently, we unblock the following signals: 1346 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 1347 // by -Xrs (=ReduceSignalUsage)); 1348 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 1349 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 1350 // the dispositions or masks wrt these signals. 1351 // Programs embedding the VM that want to use the above signals for their 1352 // own purposes must, at this time, use the "-Xrs" option to prevent 1353 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 1354 // (See bug 4345157, and other related bugs). 1355 // In reality, though, unblocking these signals is really a nop, since 1356 // these signals are not blocked by default. 1357 sigemptyset(&unblocked_sigs); 1358 sigemptyset(&allowdebug_blocked_sigs); 1359 sigaddset(&unblocked_sigs, SIGILL); 1360 sigaddset(&unblocked_sigs, SIGSEGV); 1361 sigaddset(&unblocked_sigs, SIGBUS); 1362 sigaddset(&unblocked_sigs, SIGFPE); 1363 1364 if (isJVM1available) { 1365 os::Solaris::set_SIGinterrupt(SIGJVM1); 1366 os::Solaris::set_SIGasync(SIGJVM2); 1367 } else if (UseAltSigs) { 1368 os::Solaris::set_SIGinterrupt(ALT_INTERRUPT_SIGNAL); 1369 os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL); 1370 } else { 1371 os::Solaris::set_SIGinterrupt(INTERRUPT_SIGNAL); 1372 os::Solaris::set_SIGasync(ASYNC_SIGNAL); 1373 } 1374 1375 sigaddset(&unblocked_sigs, os::Solaris::SIGinterrupt()); 1376 sigaddset(&unblocked_sigs, os::Solaris::SIGasync()); 1377 1378 if (!ReduceSignalUsage) { 1379 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 1380 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 1381 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 1382 } 1383 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 1384 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 1385 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 1386 } 1387 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 1388 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 1389 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 1390 } 1391 } 1392 // Fill in signals that are blocked by all but the VM thread. 1393 sigemptyset(&vm_sigs); 1394 if (!ReduceSignalUsage) 1395 sigaddset(&vm_sigs, BREAK_SIGNAL); 1396 debug_only(signal_sets_initialized = true); 1397 1398 // For diagnostics only used in run_periodic_checks 1399 sigemptyset(&check_signal_done); 1400} 1401 1402// These are signals that are unblocked while a thread is running Java. 1403// (For some reason, they get blocked by default.) 1404sigset_t* os::Solaris::unblocked_signals() { 1405 assert(signal_sets_initialized, "Not initialized"); 1406 return &unblocked_sigs; 1407} 1408 1409// These are the signals that are blocked while a (non-VM) thread is 1410// running Java. Only the VM thread handles these signals. 1411sigset_t* os::Solaris::vm_signals() { 1412 assert(signal_sets_initialized, "Not initialized"); 1413 return &vm_sigs; 1414} 1415 1416// These are signals that are blocked during cond_wait to allow debugger in 1417sigset_t* os::Solaris::allowdebug_blocked_signals() { 1418 assert(signal_sets_initialized, "Not initialized"); 1419 return &allowdebug_blocked_sigs; 1420} 1421 1422// First crack at OS-specific initialization, from inside the new thread. 1423void os::initialize_thread() { 1424 int r = thr_main() ; 1425 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ; 1426 if (r) { 1427 JavaThread* jt = (JavaThread *)Thread::current(); 1428 assert(jt != NULL,"Sanity check"); 1429 size_t stack_size; 1430 address base = jt->stack_base(); 1431 if (Arguments::created_by_java_launcher()) { 1432 // Use 2MB to allow for Solaris 7 64 bit mode. 1433 stack_size = JavaThread::stack_size_at_create() == 0 1434 ? 2048*K : JavaThread::stack_size_at_create(); 1435 1436 // There are rare cases when we may have already used more than 1437 // the basic stack size allotment before this method is invoked. 1438 // Attempt to allow for a normally sized java_stack. 1439 size_t current_stack_offset = (size_t)(base - (address)&stack_size); 1440 stack_size += ReservedSpace::page_align_size_down(current_stack_offset); 1441 } else { 1442 // 6269555: If we were not created by a Java launcher, i.e. if we are 1443 // running embedded in a native application, treat the primordial thread 1444 // as much like a native attached thread as possible. This means using 1445 // the current stack size from thr_stksegment(), unless it is too large 1446 // to reliably setup guard pages. A reasonable max size is 8MB. 1447 size_t current_size = current_stack_size(); 1448 // This should never happen, but just in case.... 1449 if (current_size == 0) current_size = 2 * K * K; 1450 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size; 1451 } 1452 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());; 1453 stack_size = (size_t)(base - bottom); 1454 1455 assert(stack_size > 0, "Stack size calculation problem"); 1456 1457 if (stack_size > jt->stack_size()) { 1458 NOT_PRODUCT( 1459 struct rlimit limits; 1460 getrlimit(RLIMIT_STACK, &limits); 1461 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur); 1462 assert(size >= jt->stack_size(), "Stack size problem in main thread"); 1463 ) 1464 tty->print_cr( 1465 "Stack size of %d Kb exceeds current limit of %d Kb.\n" 1466 "(Stack sizes are rounded up to a multiple of the system page size.)\n" 1467 "See limit(1) to increase the stack size limit.", 1468 stack_size / K, jt->stack_size() / K); 1469 vm_exit(1); 1470 } 1471 assert(jt->stack_size() >= stack_size, 1472 "Attempt to map more stack than was allocated"); 1473 jt->set_stack_size(stack_size); 1474 } 1475 1476 // 5/22/01: Right now alternate signal stacks do not handle 1477 // throwing stack overflow exceptions, see bug 4463178 1478 // Until a fix is found for this, T2 will NOT imply alternate signal 1479 // stacks. 1480 // If using T2 libthread threads, install an alternate signal stack. 1481 // Because alternate stacks associate with LWPs on Solaris, 1482 // see sigaltstack(2), if using UNBOUND threads, or if UseBoundThreads 1483 // we prefer to explicitly stack bang. 1484 // If not using T2 libthread, but using UseBoundThreads any threads 1485 // (primordial thread, jni_attachCurrentThread) we do not create, 1486 // probably are not bound, therefore they can not have an alternate 1487 // signal stack. Since our stack banging code is generated and 1488 // is shared across threads, all threads must be bound to allow 1489 // using alternate signal stacks. The alternative is to interpose 1490 // on _lwp_create to associate an alt sig stack with each LWP, 1491 // and this could be a problem when the JVM is embedded. 1492 // We would prefer to use alternate signal stacks with T2 1493 // Since there is currently no accurate way to detect T2 1494 // we do not. Assuming T2 when running T1 causes sig 11s or assertions 1495 // on installing alternate signal stacks 1496 1497 1498 // 05/09/03: removed alternate signal stack support for Solaris 1499 // The alternate signal stack mechanism is no longer needed to 1500 // handle stack overflow. This is now handled by allocating 1501 // guard pages (red zone) and stackbanging. 1502 // Initially the alternate signal stack mechanism was removed because 1503 // it did not work with T1 llibthread. Alternate 1504 // signal stacks MUST have all threads bound to lwps. Applications 1505 // can create their own threads and attach them without their being 1506 // bound under T1. This is frequently the case for the primordial thread. 1507 // If we were ever to reenable this mechanism we would need to 1508 // use the dynamic check for T2 libthread. 1509 1510 os::Solaris::init_thread_fpu_state(); 1511} 1512 1513 1514 1515// Free Solaris resources related to the OSThread 1516void os::free_thread(OSThread* osthread) { 1517 assert(osthread != NULL, "os::free_thread but osthread not set"); 1518 1519 1520 // We are told to free resources of the argument thread, 1521 // but we can only really operate on the current thread. 1522 // The main thread must take the VMThread down synchronously 1523 // before the main thread exits and frees up CodeHeap 1524 guarantee((Thread::current()->osthread() == osthread 1525 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread"); 1526 if (Thread::current()->osthread() == osthread) { 1527 // Restore caller's signal mask 1528 sigset_t sigmask = osthread->caller_sigmask(); 1529 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL); 1530 } 1531 delete osthread; 1532} 1533 1534void os::pd_start_thread(Thread* thread) { 1535 int status = thr_continue(thread->osthread()->thread_id()); 1536 assert_status(status == 0, status, "thr_continue failed"); 1537} 1538 1539 1540intx os::current_thread_id() { 1541 return (intx)thr_self(); 1542} 1543 1544static pid_t _initial_pid = 0; 1545 1546int os::current_process_id() { 1547 return (int)(_initial_pid ? _initial_pid : getpid()); 1548} 1549 1550int os::allocate_thread_local_storage() { 1551 // %%% in Win32 this allocates a memory segment pointed to by a 1552 // register. Dan Stein can implement a similar feature in 1553 // Solaris. Alternatively, the VM can do the same thing 1554 // explicitly: malloc some storage and keep the pointer in a 1555 // register (which is part of the thread's context) (or keep it 1556 // in TLS). 1557 // %%% In current versions of Solaris, thr_self and TSD can 1558 // be accessed via short sequences of displaced indirections. 1559 // The value of thr_self is available as %g7(36). 1560 // The value of thr_getspecific(k) is stored in %g7(12)(4)(k*4-4), 1561 // assuming that the current thread already has a value bound to k. 1562 // It may be worth experimenting with such access patterns, 1563 // and later having the parameters formally exported from a Solaris 1564 // interface. I think, however, that it will be faster to 1565 // maintain the invariant that %g2 always contains the 1566 // JavaThread in Java code, and have stubs simply 1567 // treat %g2 as a caller-save register, preserving it in a %lN. 1568 thread_key_t tk; 1569 if (thr_keycreate( &tk, NULL ) ) 1570 fatal(err_msg("os::allocate_thread_local_storage: thr_keycreate failed " 1571 "(%s)", strerror(errno))); 1572 return int(tk); 1573} 1574 1575void os::free_thread_local_storage(int index) { 1576 // %%% don't think we need anything here 1577 // if ( pthread_key_delete((pthread_key_t) tk) ) 1578 // fatal("os::free_thread_local_storage: pthread_key_delete failed"); 1579} 1580 1581#define SMALLINT 32 // libthread allocate for tsd_common is a version specific 1582 // small number - point is NO swap space available 1583void os::thread_local_storage_at_put(int index, void* value) { 1584 // %%% this is used only in threadLocalStorage.cpp 1585 if (thr_setspecific((thread_key_t)index, value)) { 1586 if (errno == ENOMEM) { 1587 vm_exit_out_of_memory(SMALLINT, "thr_setspecific: out of swap space"); 1588 } else { 1589 fatal(err_msg("os::thread_local_storage_at_put: thr_setspecific failed " 1590 "(%s)", strerror(errno))); 1591 } 1592 } else { 1593 ThreadLocalStorage::set_thread_in_slot ((Thread *) value) ; 1594 } 1595} 1596 1597// This function could be called before TLS is initialized, for example, when 1598// VM receives an async signal or when VM causes a fatal error during 1599// initialization. Return NULL if thr_getspecific() fails. 1600void* os::thread_local_storage_at(int index) { 1601 // %%% this is used only in threadLocalStorage.cpp 1602 void* r = NULL; 1603 return thr_getspecific((thread_key_t)index, &r) != 0 ? NULL : r; 1604} 1605 1606 1607const int NANOSECS_PER_MILLISECS = 1000000; 1608// gethrtime can move backwards if read from one cpu and then a different cpu 1609// getTimeNanos is guaranteed to not move backward on Solaris 1610// local spinloop created as faster for a CAS on an int than 1611// a CAS on a 64bit jlong. Also Atomic::cmpxchg for jlong is not 1612// supported on sparc v8 or pre supports_cx8 intel boxes. 1613// oldgetTimeNanos for systems which do not support CAS on 64bit jlong 1614// i.e. sparc v8 and pre supports_cx8 (i486) intel boxes 1615inline hrtime_t oldgetTimeNanos() { 1616 int gotlock = LOCK_INVALID; 1617 hrtime_t newtime = gethrtime(); 1618 1619 for (;;) { 1620// grab lock for max_hrtime 1621 int curlock = max_hrtime_lock; 1622 if (curlock & LOCK_BUSY) continue; 1623 if (gotlock = Atomic::cmpxchg(LOCK_BUSY, &max_hrtime_lock, LOCK_FREE) != LOCK_FREE) continue; 1624 if (newtime > max_hrtime) { 1625 max_hrtime = newtime; 1626 } else { 1627 newtime = max_hrtime; 1628 } 1629 // release lock 1630 max_hrtime_lock = LOCK_FREE; 1631 return newtime; 1632 } 1633} 1634// gethrtime can move backwards if read from one cpu and then a different cpu 1635// getTimeNanos is guaranteed to not move backward on Solaris 1636inline hrtime_t getTimeNanos() { 1637 if (VM_Version::supports_cx8()) { 1638 const hrtime_t now = gethrtime(); 1639 // Use atomic long load since 32-bit x86 uses 2 registers to keep long. 1640 const hrtime_t prev = Atomic::load((volatile jlong*)&max_hrtime); 1641 if (now <= prev) return prev; // same or retrograde time; 1642 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev); 1643 assert(obsv >= prev, "invariant"); // Monotonicity 1644 // If the CAS succeeded then we're done and return "now". 1645 // If the CAS failed and the observed value "obs" is >= now then 1646 // we should return "obs". If the CAS failed and now > obs > prv then 1647 // some other thread raced this thread and installed a new value, in which case 1648 // we could either (a) retry the entire operation, (b) retry trying to install now 1649 // or (c) just return obs. We use (c). No loop is required although in some cases 1650 // we might discard a higher "now" value in deference to a slightly lower but freshly 1651 // installed obs value. That's entirely benign -- it admits no new orderings compared 1652 // to (a) or (b) -- and greatly reduces coherence traffic. 1653 // We might also condition (c) on the magnitude of the delta between obs and now. 1654 // Avoiding excessive CAS operations to hot RW locations is critical. 1655 // See http://blogs.sun.com/dave/entry/cas_and_cache_trivia_invalidate 1656 return (prev == obsv) ? now : obsv ; 1657 } else { 1658 return oldgetTimeNanos(); 1659 } 1660} 1661 1662// Time since start-up in seconds to a fine granularity. 1663// Used by VMSelfDestructTimer and the MemProfiler. 1664double os::elapsedTime() { 1665 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; 1666} 1667 1668jlong os::elapsed_counter() { 1669 return (jlong)(getTimeNanos() - first_hrtime); 1670} 1671 1672jlong os::elapsed_frequency() { 1673 return hrtime_hz; 1674} 1675 1676// Return the real, user, and system times in seconds from an 1677// arbitrary fixed point in the past. 1678bool os::getTimesSecs(double* process_real_time, 1679 double* process_user_time, 1680 double* process_system_time) { 1681 struct tms ticks; 1682 clock_t real_ticks = times(&ticks); 1683 1684 if (real_ticks == (clock_t) (-1)) { 1685 return false; 1686 } else { 1687 double ticks_per_second = (double) clock_tics_per_sec; 1688 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1689 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1690 // For consistency return the real time from getTimeNanos() 1691 // converted to seconds. 1692 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS); 1693 1694 return true; 1695 } 1696} 1697 1698bool os::supports_vtime() { return true; } 1699 1700bool os::enable_vtime() { 1701 int fd = open("/proc/self/ctl", O_WRONLY); 1702 if (fd == -1) 1703 return false; 1704 1705 long cmd[] = { PCSET, PR_MSACCT }; 1706 int res = write(fd, cmd, sizeof(long) * 2); 1707 close(fd); 1708 if (res != sizeof(long) * 2) 1709 return false; 1710 1711 return true; 1712} 1713 1714bool os::vtime_enabled() { 1715 int fd = open("/proc/self/status", O_RDONLY); 1716 if (fd == -1) 1717 return false; 1718 1719 pstatus_t status; 1720 int res = read(fd, (void*) &status, sizeof(pstatus_t)); 1721 close(fd); 1722 if (res != sizeof(pstatus_t)) 1723 return false; 1724 1725 return status.pr_flags & PR_MSACCT; 1726} 1727 1728double os::elapsedVTime() { 1729 return (double)gethrvtime() / (double)hrtime_hz; 1730} 1731 1732// Used internally for comparisons only 1733// getTimeMillis guaranteed to not move backwards on Solaris 1734jlong getTimeMillis() { 1735 jlong nanotime = getTimeNanos(); 1736 return (jlong)(nanotime / NANOSECS_PER_MILLISECS); 1737} 1738 1739// Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis 1740jlong os::javaTimeMillis() { 1741 timeval t; 1742 if (gettimeofday( &t, NULL) == -1) 1743 fatal(err_msg("os::javaTimeMillis: gettimeofday (%s)", strerror(errno))); 1744 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000; 1745} 1746 1747jlong os::javaTimeNanos() { 1748 return (jlong)getTimeNanos(); 1749} 1750 1751void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1752 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits 1753 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1754 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1755 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1756} 1757 1758char * os::local_time_string(char *buf, size_t buflen) { 1759 struct tm t; 1760 time_t long_time; 1761 time(&long_time); 1762 localtime_r(&long_time, &t); 1763 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1764 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1765 t.tm_hour, t.tm_min, t.tm_sec); 1766 return buf; 1767} 1768 1769// Note: os::shutdown() might be called very early during initialization, or 1770// called from signal handler. Before adding something to os::shutdown(), make 1771// sure it is async-safe and can handle partially initialized VM. 1772void os::shutdown() { 1773 1774 // allow PerfMemory to attempt cleanup of any persistent resources 1775 perfMemory_exit(); 1776 1777 // needs to remove object in file system 1778 AttachListener::abort(); 1779 1780 // flush buffered output, finish log files 1781 ostream_abort(); 1782 1783 // Check for abort hook 1784 abort_hook_t abort_hook = Arguments::abort_hook(); 1785 if (abort_hook != NULL) { 1786 abort_hook(); 1787 } 1788} 1789 1790// Note: os::abort() might be called very early during initialization, or 1791// called from signal handler. Before adding something to os::abort(), make 1792// sure it is async-safe and can handle partially initialized VM. 1793void os::abort(bool dump_core) { 1794 os::shutdown(); 1795 if (dump_core) { 1796#ifndef PRODUCT 1797 fdStream out(defaultStream::output_fd()); 1798 out.print_raw("Current thread is "); 1799 char buf[16]; 1800 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1801 out.print_raw_cr(buf); 1802 out.print_raw_cr("Dumping core ..."); 1803#endif 1804 ::abort(); // dump core (for debugging) 1805 } 1806 1807 ::exit(1); 1808} 1809 1810// Die immediately, no exit hook, no abort hook, no cleanup. 1811void os::die() { 1812 _exit(-1); 1813} 1814 1815// unused 1816void os::set_error_file(const char *logfile) {} 1817 1818// DLL functions 1819 1820const char* os::dll_file_extension() { return ".so"; } 1821 1822const char* os::get_temp_directory() { 1823 const char *prop = Arguments::get_property("java.io.tmpdir"); 1824 return prop == NULL ? "/tmp" : prop; 1825} 1826 1827static bool file_exists(const char* filename) { 1828 struct stat statbuf; 1829 if (filename == NULL || strlen(filename) == 0) { 1830 return false; 1831 } 1832 return os::stat(filename, &statbuf) == 0; 1833} 1834 1835void os::dll_build_name(char* buffer, size_t buflen, 1836 const char* pname, const char* fname) { 1837 // Copied from libhpi 1838 const size_t pnamelen = pname ? strlen(pname) : 0; 1839 1840 // Quietly truncate on buffer overflow. Should be an error. 1841 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { 1842 *buffer = '\0'; 1843 return; 1844 } 1845 1846 if (pnamelen == 0) { 1847 snprintf(buffer, buflen, "lib%s.so", fname); 1848 } else if (strchr(pname, *os::path_separator()) != NULL) { 1849 int n; 1850 char** pelements = split_path(pname, &n); 1851 for (int i = 0 ; i < n ; i++) { 1852 // really shouldn't be NULL but what the heck, check can't hurt 1853 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1854 continue; // skip the empty path values 1855 } 1856 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); 1857 if (file_exists(buffer)) { 1858 break; 1859 } 1860 } 1861 // release the storage 1862 for (int i = 0 ; i < n ; i++) { 1863 if (pelements[i] != NULL) { 1864 FREE_C_HEAP_ARRAY(char, pelements[i]); 1865 } 1866 } 1867 if (pelements != NULL) { 1868 FREE_C_HEAP_ARRAY(char*, pelements); 1869 } 1870 } else { 1871 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); 1872 } 1873} 1874 1875const char* os::get_current_directory(char *buf, int buflen) { 1876 return getcwd(buf, buflen); 1877} 1878 1879// check if addr is inside libjvm[_g].so 1880bool os::address_is_in_vm(address addr) { 1881 static address libjvm_base_addr; 1882 Dl_info dlinfo; 1883 1884 if (libjvm_base_addr == NULL) { 1885 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); 1886 libjvm_base_addr = (address)dlinfo.dli_fbase; 1887 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1888 } 1889 1890 if (dladdr((void *)addr, &dlinfo)) { 1891 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1892 } 1893 1894 return false; 1895} 1896 1897typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int); 1898static dladdr1_func_type dladdr1_func = NULL; 1899 1900bool os::dll_address_to_function_name(address addr, char *buf, 1901 int buflen, int * offset) { 1902 Dl_info dlinfo; 1903 1904 // dladdr1_func was initialized in os::init() 1905 if (dladdr1_func){ 1906 // yes, we have dladdr1 1907 1908 // Support for dladdr1 is checked at runtime; it may be 1909 // available even if the vm is built on a machine that does 1910 // not have dladdr1 support. Make sure there is a value for 1911 // RTLD_DL_SYMENT. 1912 #ifndef RTLD_DL_SYMENT 1913 #define RTLD_DL_SYMENT 1 1914 #endif 1915 Sym * info; 1916 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, 1917 RTLD_DL_SYMENT)) { 1918 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1919 if (offset) *offset = addr - (address)dlinfo.dli_saddr; 1920 1921 // check if the returned symbol really covers addr 1922 return ((char *)dlinfo.dli_saddr + info->st_size > (char *)addr); 1923 } else { 1924 if (buf) buf[0] = '\0'; 1925 if (offset) *offset = -1; 1926 return false; 1927 } 1928 } else { 1929 // no, only dladdr is available 1930 if(dladdr((void *)addr, &dlinfo)) { 1931 if (buf) jio_snprintf(buf, buflen, dlinfo.dli_sname); 1932 if (offset) *offset = addr - (address)dlinfo.dli_saddr; 1933 return true; 1934 } else { 1935 if (buf) buf[0] = '\0'; 1936 if (offset) *offset = -1; 1937 return false; 1938 } 1939 } 1940} 1941 1942bool os::dll_address_to_library_name(address addr, char* buf, 1943 int buflen, int* offset) { 1944 Dl_info dlinfo; 1945 1946 if (dladdr((void*)addr, &dlinfo)){ 1947 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1948 if (offset) *offset = addr - (address)dlinfo.dli_fbase; 1949 return true; 1950 } else { 1951 if (buf) buf[0] = '\0'; 1952 if (offset) *offset = -1; 1953 return false; 1954 } 1955} 1956 1957// Prints the names and full paths of all opened dynamic libraries 1958// for current process 1959void os::print_dll_info(outputStream * st) { 1960 Dl_info dli; 1961 void *handle; 1962 Link_map *map; 1963 Link_map *p; 1964 1965 st->print_cr("Dynamic libraries:"); st->flush(); 1966 1967 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { 1968 st->print_cr("Error: Cannot print dynamic libraries."); 1969 return; 1970 } 1971 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1972 if (handle == NULL) { 1973 st->print_cr("Error: Cannot print dynamic libraries."); 1974 return; 1975 } 1976 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1977 if (map == NULL) { 1978 st->print_cr("Error: Cannot print dynamic libraries."); 1979 return; 1980 } 1981 1982 while (map->l_prev != NULL) 1983 map = map->l_prev; 1984 1985 while (map != NULL) { 1986 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); 1987 map = map->l_next; 1988 } 1989 1990 dlclose(handle); 1991} 1992 1993 // Loads .dll/.so and 1994 // in case of error it checks if .dll/.so was built for the 1995 // same architecture as Hotspot is running on 1996 1997void * os::dll_load(const char *filename, char *ebuf, int ebuflen) 1998{ 1999 void * result= ::dlopen(filename, RTLD_LAZY); 2000 if (result != NULL) { 2001 // Successful loading 2002 return result; 2003 } 2004 2005 Elf32_Ehdr elf_head; 2006 2007 // Read system error message into ebuf 2008 // It may or may not be overwritten below 2009 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 2010 ebuf[ebuflen-1]='\0'; 2011 int diag_msg_max_length=ebuflen-strlen(ebuf); 2012 char* diag_msg_buf=ebuf+strlen(ebuf); 2013 2014 if (diag_msg_max_length==0) { 2015 // No more space in ebuf for additional diagnostics message 2016 return NULL; 2017 } 2018 2019 2020 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 2021 2022 if (file_descriptor < 0) { 2023 // Can't open library, report dlerror() message 2024 return NULL; 2025 } 2026 2027 bool failed_to_read_elf_head= 2028 (sizeof(elf_head)!= 2029 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; 2030 2031 ::close(file_descriptor); 2032 if (failed_to_read_elf_head) { 2033 // file i/o error - report dlerror() msg 2034 return NULL; 2035 } 2036 2037 typedef struct { 2038 Elf32_Half code; // Actual value as defined in elf.h 2039 Elf32_Half compat_class; // Compatibility of archs at VM's sense 2040 char elf_class; // 32 or 64 bit 2041 char endianess; // MSB or LSB 2042 char* name; // String representation 2043 } arch_t; 2044 2045 static const arch_t arch_array[]={ 2046 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 2047 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 2048 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 2049 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 2050 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 2051 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 2052 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 2053 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 2054 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 2055 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"} 2056 }; 2057 2058 #if (defined IA32) 2059 static Elf32_Half running_arch_code=EM_386; 2060 #elif (defined AMD64) 2061 static Elf32_Half running_arch_code=EM_X86_64; 2062 #elif (defined IA64) 2063 static Elf32_Half running_arch_code=EM_IA_64; 2064 #elif (defined __sparc) && (defined _LP64) 2065 static Elf32_Half running_arch_code=EM_SPARCV9; 2066 #elif (defined __sparc) && (!defined _LP64) 2067 static Elf32_Half running_arch_code=EM_SPARC; 2068 #elif (defined __powerpc64__) 2069 static Elf32_Half running_arch_code=EM_PPC64; 2070 #elif (defined __powerpc__) 2071 static Elf32_Half running_arch_code=EM_PPC; 2072 #elif (defined ARM) 2073 static Elf32_Half running_arch_code=EM_ARM; 2074 #else 2075 #error Method os::dll_load requires that one of following is defined:\ 2076 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM 2077 #endif 2078 2079 // Identify compatability class for VM's architecture and library's architecture 2080 // Obtain string descriptions for architectures 2081 2082 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 2083 int running_arch_index=-1; 2084 2085 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { 2086 if (running_arch_code == arch_array[i].code) { 2087 running_arch_index = i; 2088 } 2089 if (lib_arch.code == arch_array[i].code) { 2090 lib_arch.compat_class = arch_array[i].compat_class; 2091 lib_arch.name = arch_array[i].name; 2092 } 2093 } 2094 2095 assert(running_arch_index != -1, 2096 "Didn't find running architecture code (running_arch_code) in arch_array"); 2097 if (running_arch_index == -1) { 2098 // Even though running architecture detection failed 2099 // we may still continue with reporting dlerror() message 2100 return NULL; 2101 } 2102 2103 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 2104 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 2105 return NULL; 2106 } 2107 2108 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 2109 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 2110 return NULL; 2111 } 2112 2113 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 2114 if ( lib_arch.name!=NULL ) { 2115 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 2116 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 2117 lib_arch.name, arch_array[running_arch_index].name); 2118 } else { 2119 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 2120 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 2121 lib_arch.code, 2122 arch_array[running_arch_index].name); 2123 } 2124 } 2125 2126 return NULL; 2127} 2128 2129void* os::dll_lookup(void* handle, const char* name) { 2130 return dlsym(handle, name); 2131} 2132 2133 2134bool _print_ascii_file(const char* filename, outputStream* st) { 2135 int fd = open(filename, O_RDONLY); 2136 if (fd == -1) { 2137 return false; 2138 } 2139 2140 char buf[32]; 2141 int bytes; 2142 while ((bytes = read(fd, buf, sizeof(buf))) > 0) { 2143 st->print_raw(buf, bytes); 2144 } 2145 2146 close(fd); 2147 2148 return true; 2149} 2150 2151void os::print_os_info(outputStream* st) { 2152 st->print("OS:"); 2153 2154 if (!_print_ascii_file("/etc/release", st)) { 2155 st->print("Solaris"); 2156 } 2157 st->cr(); 2158 2159 // kernel 2160 st->print("uname:"); 2161 struct utsname name; 2162 uname(&name); 2163 st->print(name.sysname); st->print(" "); 2164 st->print(name.release); st->print(" "); 2165 st->print(name.version); st->print(" "); 2166 st->print(name.machine); 2167 2168 // libthread 2169 if (os::Solaris::T2_libthread()) st->print(" (T2 libthread)"); 2170 else st->print(" (T1 libthread)"); 2171 st->cr(); 2172 2173 // rlimit 2174 st->print("rlimit:"); 2175 struct rlimit rlim; 2176 2177 st->print(" STACK "); 2178 getrlimit(RLIMIT_STACK, &rlim); 2179 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2180 else st->print("%uk", rlim.rlim_cur >> 10); 2181 2182 st->print(", CORE "); 2183 getrlimit(RLIMIT_CORE, &rlim); 2184 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2185 else st->print("%uk", rlim.rlim_cur >> 10); 2186 2187 st->print(", NOFILE "); 2188 getrlimit(RLIMIT_NOFILE, &rlim); 2189 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2190 else st->print("%d", rlim.rlim_cur); 2191 2192 st->print(", AS "); 2193 getrlimit(RLIMIT_AS, &rlim); 2194 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2195 else st->print("%uk", rlim.rlim_cur >> 10); 2196 st->cr(); 2197 2198 // load average 2199 st->print("load average:"); 2200 double loadavg[3]; 2201 os::loadavg(loadavg, 3); 2202 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); 2203 st->cr(); 2204} 2205 2206 2207static bool check_addr0(outputStream* st) { 2208 jboolean status = false; 2209 int fd = open("/proc/self/map",O_RDONLY); 2210 if (fd >= 0) { 2211 prmap_t p; 2212 while(read(fd, &p, sizeof(p)) > 0) { 2213 if (p.pr_vaddr == 0x0) { 2214 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname); 2215 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname); 2216 st->print("Access:"); 2217 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-"); 2218 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-"); 2219 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-"); 2220 st->cr(); 2221 status = true; 2222 } 2223 close(fd); 2224 } 2225 } 2226 return status; 2227} 2228 2229void os::print_memory_info(outputStream* st) { 2230 st->print("Memory:"); 2231 st->print(" %dk page", os::vm_page_size()>>10); 2232 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 2233 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 2234 st->cr(); 2235 (void) check_addr0(st); 2236} 2237 2238// Taken from /usr/include/sys/machsig.h Supposed to be architecture specific 2239// but they're the same for all the solaris architectures that we support. 2240const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", 2241 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", 2242 "ILL_COPROC", "ILL_BADSTK" }; 2243 2244const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", 2245 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", 2246 "FPE_FLTINV", "FPE_FLTSUB" }; 2247 2248const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; 2249 2250const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; 2251 2252void os::print_siginfo(outputStream* st, void* siginfo) { 2253 st->print("siginfo:"); 2254 2255 const int buflen = 100; 2256 char buf[buflen]; 2257 siginfo_t *si = (siginfo_t*)siginfo; 2258 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); 2259 char *err = strerror(si->si_errno); 2260 if (si->si_errno != 0 && err != NULL) { 2261 st->print("si_errno=%s", err); 2262 } else { 2263 st->print("si_errno=%d", si->si_errno); 2264 } 2265 const int c = si->si_code; 2266 assert(c > 0, "unexpected si_code"); 2267 switch (si->si_signo) { 2268 case SIGILL: 2269 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); 2270 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2271 break; 2272 case SIGFPE: 2273 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); 2274 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2275 break; 2276 case SIGSEGV: 2277 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); 2278 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2279 break; 2280 case SIGBUS: 2281 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); 2282 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2283 break; 2284 default: 2285 st->print(", si_code=%d", si->si_code); 2286 // no si_addr 2287 } 2288 2289 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && 2290 UseSharedSpaces) { 2291 FileMapInfo* mapinfo = FileMapInfo::current_info(); 2292 if (mapinfo->is_in_shared_space(si->si_addr)) { 2293 st->print("\n\nError accessing class data sharing archive." \ 2294 " Mapped file inaccessible during execution, " \ 2295 " possible disk/network problem."); 2296 } 2297 } 2298 st->cr(); 2299} 2300 2301// Moved from whole group, because we need them here for diagnostic 2302// prints. 2303#define OLDMAXSIGNUM 32 2304static int Maxsignum = 0; 2305static int *ourSigFlags = NULL; 2306 2307extern "C" void sigINTRHandler(int, siginfo_t*, void*); 2308 2309int os::Solaris::get_our_sigflags(int sig) { 2310 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 2311 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 2312 return ourSigFlags[sig]; 2313} 2314 2315void os::Solaris::set_our_sigflags(int sig, int flags) { 2316 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 2317 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 2318 ourSigFlags[sig] = flags; 2319} 2320 2321 2322static const char* get_signal_handler_name(address handler, 2323 char* buf, int buflen) { 2324 int offset; 2325 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 2326 if (found) { 2327 // skip directory names 2328 const char *p1, *p2; 2329 p1 = buf; 2330 size_t len = strlen(os::file_separator()); 2331 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 2332 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 2333 } else { 2334 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 2335 } 2336 return buf; 2337} 2338 2339static void print_signal_handler(outputStream* st, int sig, 2340 char* buf, size_t buflen) { 2341 struct sigaction sa; 2342 2343 sigaction(sig, NULL, &sa); 2344 2345 st->print("%s: ", os::exception_name(sig, buf, buflen)); 2346 2347 address handler = (sa.sa_flags & SA_SIGINFO) 2348 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 2349 : CAST_FROM_FN_PTR(address, sa.sa_handler); 2350 2351 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 2352 st->print("SIG_DFL"); 2353 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 2354 st->print("SIG_IGN"); 2355 } else { 2356 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 2357 } 2358 2359 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); 2360 2361 address rh = VMError::get_resetted_sighandler(sig); 2362 // May be, handler was resetted by VMError? 2363 if(rh != NULL) { 2364 handler = rh; 2365 sa.sa_flags = VMError::get_resetted_sigflags(sig); 2366 } 2367 2368 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); 2369 2370 // Check: is it our handler? 2371 if(handler == CAST_FROM_FN_PTR(address, signalHandler) || 2372 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) { 2373 // It is our signal handler 2374 // check for flags 2375 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 2376 st->print( 2377 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 2378 os::Solaris::get_our_sigflags(sig)); 2379 } 2380 } 2381 st->cr(); 2382} 2383 2384void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 2385 st->print_cr("Signal Handlers:"); 2386 print_signal_handler(st, SIGSEGV, buf, buflen); 2387 print_signal_handler(st, SIGBUS , buf, buflen); 2388 print_signal_handler(st, SIGFPE , buf, buflen); 2389 print_signal_handler(st, SIGPIPE, buf, buflen); 2390 print_signal_handler(st, SIGXFSZ, buf, buflen); 2391 print_signal_handler(st, SIGILL , buf, buflen); 2392 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); 2393 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 2394 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 2395 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 2396 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 2397 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 2398 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen); 2399 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen); 2400} 2401 2402static char saved_jvm_path[MAXPATHLEN] = { 0 }; 2403 2404// Find the full path to the current module, libjvm.so or libjvm_g.so 2405void os::jvm_path(char *buf, jint buflen) { 2406 // Error checking. 2407 if (buflen < MAXPATHLEN) { 2408 assert(false, "must use a large-enough buffer"); 2409 buf[0] = '\0'; 2410 return; 2411 } 2412 // Lazy resolve the path to current module. 2413 if (saved_jvm_path[0] != 0) { 2414 strcpy(buf, saved_jvm_path); 2415 return; 2416 } 2417 2418 Dl_info dlinfo; 2419 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 2420 assert(ret != 0, "cannot locate libjvm"); 2421 realpath((char *)dlinfo.dli_fname, buf); 2422 2423 if (strcmp(Arguments::sun_java_launcher(), "gamma") == 0) { 2424 // Support for the gamma launcher. Typical value for buf is 2425 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at 2426 // the right place in the string, then assume we are installed in a JDK and 2427 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix 2428 // up the path so it looks like libjvm.so is installed there (append a 2429 // fake suffix hotspot/libjvm.so). 2430 const char *p = buf + strlen(buf) - 1; 2431 for (int count = 0; p > buf && count < 5; ++count) { 2432 for (--p; p > buf && *p != '/'; --p) 2433 /* empty */ ; 2434 } 2435 2436 if (strncmp(p, "/jre/lib/", 9) != 0) { 2437 // Look for JAVA_HOME in the environment. 2438 char* java_home_var = ::getenv("JAVA_HOME"); 2439 if (java_home_var != NULL && java_home_var[0] != 0) { 2440 char cpu_arch[12]; 2441 char* jrelib_p; 2442 int len; 2443 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 2444#ifdef _LP64 2445 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9. 2446 if (strcmp(cpu_arch, "sparc") == 0) { 2447 strcat(cpu_arch, "v9"); 2448 } else if (strcmp(cpu_arch, "i386") == 0) { 2449 strcpy(cpu_arch, "amd64"); 2450 } 2451#endif 2452 // Check the current module name "libjvm.so" or "libjvm_g.so". 2453 p = strrchr(buf, '/'); 2454 assert(strstr(p, "/libjvm") == p, "invalid library name"); 2455 p = strstr(p, "_g") ? "_g" : ""; 2456 2457 realpath(java_home_var, buf); 2458 // determine if this is a legacy image or modules image 2459 // modules image doesn't have "jre" subdirectory 2460 len = strlen(buf); 2461 jrelib_p = buf + len; 2462 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); 2463 if (0 != access(buf, F_OK)) { 2464 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); 2465 } 2466 2467 if (0 == access(buf, F_OK)) { 2468 // Use current module name "libjvm[_g].so" instead of 2469 // "libjvm"debug_only("_g")".so" since for fastdebug version 2470 // we should have "libjvm.so" but debug_only("_g") adds "_g"! 2471 // It is used when we are choosing the HPI library's name 2472 // "libhpi[_g].so" in hpi::initialize_get_interface(). 2473 len = strlen(buf); 2474 snprintf(buf + len, buflen-len, "/hotspot/libjvm%s.so", p); 2475 } else { 2476 // Go back to path of .so 2477 realpath((char *)dlinfo.dli_fname, buf); 2478 } 2479 } 2480 } 2481 } 2482 2483 strcpy(saved_jvm_path, buf); 2484} 2485 2486 2487void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2488 // no prefix required, not even "_" 2489} 2490 2491 2492void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2493 // no suffix required 2494} 2495 2496 2497// sun.misc.Signal 2498 2499extern "C" { 2500 static void UserHandler(int sig, void *siginfo, void *context) { 2501 // Ctrl-C is pressed during error reporting, likely because the error 2502 // handler fails to abort. Let VM die immediately. 2503 if (sig == SIGINT && is_error_reported()) { 2504 os::die(); 2505 } 2506 2507 os::signal_notify(sig); 2508 // We do not need to reinstate the signal handler each time... 2509 } 2510} 2511 2512void* os::user_handler() { 2513 return CAST_FROM_FN_PTR(void*, UserHandler); 2514} 2515 2516extern "C" { 2517 typedef void (*sa_handler_t)(int); 2518 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2519} 2520 2521void* os::signal(int signal_number, void* handler) { 2522 struct sigaction sigAct, oldSigAct; 2523 sigfillset(&(sigAct.sa_mask)); 2524 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 2525 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2526 2527 if (sigaction(signal_number, &sigAct, &oldSigAct)) 2528 // -1 means registration failed 2529 return (void *)-1; 2530 2531 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2532} 2533 2534void os::signal_raise(int signal_number) { 2535 raise(signal_number); 2536} 2537 2538/* 2539 * The following code is moved from os.cpp for making this 2540 * code platform specific, which it is by its very nature. 2541 */ 2542 2543// a counter for each possible signal value 2544static int Sigexit = 0; 2545static int Maxlibjsigsigs; 2546static jint *pending_signals = NULL; 2547static int *preinstalled_sigs = NULL; 2548static struct sigaction *chainedsigactions = NULL; 2549static sema_t sig_sem; 2550typedef int (*version_getting_t)(); 2551version_getting_t os::Solaris::get_libjsig_version = NULL; 2552static int libjsigversion = NULL; 2553 2554int os::sigexitnum_pd() { 2555 assert(Sigexit > 0, "signal memory not yet initialized"); 2556 return Sigexit; 2557} 2558 2559void os::Solaris::init_signal_mem() { 2560 // Initialize signal structures 2561 Maxsignum = SIGRTMAX; 2562 Sigexit = Maxsignum+1; 2563 assert(Maxsignum >0, "Unable to obtain max signal number"); 2564 2565 Maxlibjsigsigs = Maxsignum; 2566 2567 // pending_signals has one int per signal 2568 // The additional signal is for SIGEXIT - exit signal to signal_thread 2569 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1)); 2570 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 2571 2572 if (UseSignalChaining) { 2573 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 2574 * (Maxsignum + 1)); 2575 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 2576 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1)); 2577 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 2578 } 2579 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 )); 2580 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 2581} 2582 2583void os::signal_init_pd() { 2584 int ret; 2585 2586 ret = ::sema_init(&sig_sem, 0, NULL, NULL); 2587 assert(ret == 0, "sema_init() failed"); 2588} 2589 2590void os::signal_notify(int signal_number) { 2591 int ret; 2592 2593 Atomic::inc(&pending_signals[signal_number]); 2594 ret = ::sema_post(&sig_sem); 2595 assert(ret == 0, "sema_post() failed"); 2596} 2597 2598static int check_pending_signals(bool wait_for_signal) { 2599 int ret; 2600 while (true) { 2601 for (int i = 0; i < Sigexit + 1; i++) { 2602 jint n = pending_signals[i]; 2603 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2604 return i; 2605 } 2606 } 2607 if (!wait_for_signal) { 2608 return -1; 2609 } 2610 JavaThread *thread = JavaThread::current(); 2611 ThreadBlockInVM tbivm(thread); 2612 2613 bool threadIsSuspended; 2614 do { 2615 thread->set_suspend_equivalent(); 2616 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2617 while((ret = ::sema_wait(&sig_sem)) == EINTR) 2618 ; 2619 assert(ret == 0, "sema_wait() failed"); 2620 2621 // were we externally suspended while we were waiting? 2622 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2623 if (threadIsSuspended) { 2624 // 2625 // The semaphore has been incremented, but while we were waiting 2626 // another thread suspended us. We don't want to continue running 2627 // while suspended because that would surprise the thread that 2628 // suspended us. 2629 // 2630 ret = ::sema_post(&sig_sem); 2631 assert(ret == 0, "sema_post() failed"); 2632 2633 thread->java_suspend_self(); 2634 } 2635 } while (threadIsSuspended); 2636 } 2637} 2638 2639int os::signal_lookup() { 2640 return check_pending_signals(false); 2641} 2642 2643int os::signal_wait() { 2644 return check_pending_signals(true); 2645} 2646 2647//////////////////////////////////////////////////////////////////////////////// 2648// Virtual Memory 2649 2650static int page_size = -1; 2651 2652// The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will 2653// clear this var if support is not available. 2654static bool has_map_align = true; 2655 2656int os::vm_page_size() { 2657 assert(page_size != -1, "must call os::init"); 2658 return page_size; 2659} 2660 2661// Solaris allocates memory by pages. 2662int os::vm_allocation_granularity() { 2663 assert(page_size != -1, "must call os::init"); 2664 return page_size; 2665} 2666 2667bool os::commit_memory(char* addr, size_t bytes, bool exec) { 2668 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2669 size_t size = bytes; 2670 return 2671 NULL != Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); 2672} 2673 2674bool os::commit_memory(char* addr, size_t bytes, size_t alignment_hint, 2675 bool exec) { 2676 if (commit_memory(addr, bytes, exec)) { 2677 if (UseMPSS && alignment_hint > (size_t)vm_page_size()) { 2678 // If the large page size has been set and the VM 2679 // is using large pages, use the large page size 2680 // if it is smaller than the alignment hint. This is 2681 // a case where the VM wants to use a larger alignment size 2682 // for its own reasons but still want to use large pages 2683 // (which is what matters to setting the mpss range. 2684 size_t page_size = 0; 2685 if (large_page_size() < alignment_hint) { 2686 assert(UseLargePages, "Expected to be here for large page use only"); 2687 page_size = large_page_size(); 2688 } else { 2689 // If the alignment hint is less than the large page 2690 // size, the VM wants a particular alignment (thus the hint) 2691 // for internal reasons. Try to set the mpss range using 2692 // the alignment_hint. 2693 page_size = alignment_hint; 2694 } 2695 // Since this is a hint, ignore any failures. 2696 (void)Solaris::set_mpss_range(addr, bytes, page_size); 2697 } 2698 return true; 2699 } 2700 return false; 2701} 2702 2703// Uncommit the pages in a specified region. 2704void os::free_memory(char* addr, size_t bytes) { 2705 if (madvise(addr, bytes, MADV_FREE) < 0) { 2706 debug_only(warning("MADV_FREE failed.")); 2707 return; 2708 } 2709} 2710 2711bool os::create_stack_guard_pages(char* addr, size_t size) { 2712 return os::commit_memory(addr, size); 2713} 2714 2715bool os::remove_stack_guard_pages(char* addr, size_t size) { 2716 return os::uncommit_memory(addr, size); 2717} 2718 2719// Change the page size in a given range. 2720void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2721 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2722 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2723 Solaris::set_mpss_range(addr, bytes, alignment_hint); 2724} 2725 2726// Tell the OS to make the range local to the first-touching LWP 2727void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2728 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2729 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2730 debug_only(warning("MADV_ACCESS_LWP failed.")); 2731 } 2732} 2733 2734// Tell the OS that this range would be accessed from different LWPs. 2735void os::numa_make_global(char *addr, size_t bytes) { 2736 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2737 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2738 debug_only(warning("MADV_ACCESS_MANY failed.")); 2739 } 2740} 2741 2742// Get the number of the locality groups. 2743size_t os::numa_get_groups_num() { 2744 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2745 return n != -1 ? n : 1; 2746} 2747 2748// Get a list of leaf locality groups. A leaf lgroup is group that 2749// doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2750// board. An LWP is assigned to one of these groups upon creation. 2751size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2752 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2753 ids[0] = 0; 2754 return 1; 2755 } 2756 int result_size = 0, top = 1, bottom = 0, cur = 0; 2757 for (int k = 0; k < size; k++) { 2758 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2759 (Solaris::lgrp_id_t*)&ids[top], size - top); 2760 if (r == -1) { 2761 ids[0] = 0; 2762 return 1; 2763 } 2764 if (!r) { 2765 // That's a leaf node. 2766 assert (bottom <= cur, "Sanity check"); 2767 // Check if the node has memory 2768 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], 2769 NULL, 0, LGRP_RSRC_MEM) > 0) { 2770 ids[bottom++] = ids[cur]; 2771 } 2772 } 2773 top += r; 2774 cur++; 2775 } 2776 if (bottom == 0) { 2777 // Handle a situation, when the OS reports no memory available. 2778 // Assume UMA architecture. 2779 ids[0] = 0; 2780 return 1; 2781 } 2782 return bottom; 2783} 2784 2785// Detect the topology change. Typically happens during CPU plugging-unplugging. 2786bool os::numa_topology_changed() { 2787 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2788 if (is_stale != -1 && is_stale) { 2789 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2790 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2791 assert(c != 0, "Failure to initialize LGRP API"); 2792 Solaris::set_lgrp_cookie(c); 2793 return true; 2794 } 2795 return false; 2796} 2797 2798// Get the group id of the current LWP. 2799int os::numa_get_group_id() { 2800 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); 2801 if (lgrp_id == -1) { 2802 return 0; 2803 } 2804 const int size = os::numa_get_groups_num(); 2805 int *ids = (int*)alloca(size * sizeof(int)); 2806 2807 // Get the ids of all lgroups with memory; r is the count. 2808 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, 2809 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); 2810 if (r <= 0) { 2811 return 0; 2812 } 2813 return ids[os::random() % r]; 2814} 2815 2816// Request information about the page. 2817bool os::get_page_info(char *start, page_info* info) { 2818 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2819 uint64_t addr = (uintptr_t)start; 2820 uint64_t outdata[2]; 2821 uint_t validity = 0; 2822 2823 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2824 return false; 2825 } 2826 2827 info->size = 0; 2828 info->lgrp_id = -1; 2829 2830 if ((validity & 1) != 0) { 2831 if ((validity & 2) != 0) { 2832 info->lgrp_id = outdata[0]; 2833 } 2834 if ((validity & 4) != 0) { 2835 info->size = outdata[1]; 2836 } 2837 return true; 2838 } 2839 return false; 2840} 2841 2842// Scan the pages from start to end until a page different than 2843// the one described in the info parameter is encountered. 2844char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2845 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2846 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 2847 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT]; 2848 uint_t validity[MAX_MEMINFO_CNT]; 2849 2850 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 2851 uint64_t p = (uint64_t)start; 2852 while (p < (uint64_t)end) { 2853 addrs[0] = p; 2854 size_t addrs_count = 1; 2855 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] < (uint64_t)end) { 2856 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 2857 addrs_count++; 2858 } 2859 2860 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 2861 return NULL; 2862 } 2863 2864 size_t i = 0; 2865 for (; i < addrs_count; i++) { 2866 if ((validity[i] & 1) != 0) { 2867 if ((validity[i] & 4) != 0) { 2868 if (outdata[types * i + 1] != page_expected->size) { 2869 break; 2870 } 2871 } else 2872 if (page_expected->size != 0) { 2873 break; 2874 } 2875 2876 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 2877 if (outdata[types * i] != page_expected->lgrp_id) { 2878 break; 2879 } 2880 } 2881 } else { 2882 return NULL; 2883 } 2884 } 2885 2886 if (i != addrs_count) { 2887 if ((validity[i] & 2) != 0) { 2888 page_found->lgrp_id = outdata[types * i]; 2889 } else { 2890 page_found->lgrp_id = -1; 2891 } 2892 if ((validity[i] & 4) != 0) { 2893 page_found->size = outdata[types * i + 1]; 2894 } else { 2895 page_found->size = 0; 2896 } 2897 return (char*)addrs[i]; 2898 } 2899 2900 p = addrs[addrs_count - 1] + page_size; 2901 } 2902 return end; 2903} 2904 2905bool os::uncommit_memory(char* addr, size_t bytes) { 2906 size_t size = bytes; 2907 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2908 // uncommitted page. Otherwise, the read/write might succeed if we 2909 // have enough swap space to back the physical page. 2910 return 2911 NULL != Solaris::mmap_chunk(addr, size, 2912 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 2913 PROT_NONE); 2914} 2915 2916char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 2917 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 2918 2919 if (b == MAP_FAILED) { 2920 return NULL; 2921 } 2922 return b; 2923} 2924 2925char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) { 2926 char* addr = requested_addr; 2927 int flags = MAP_PRIVATE | MAP_NORESERVE; 2928 2929 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap"); 2930 2931 if (fixed) { 2932 flags |= MAP_FIXED; 2933 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) { 2934 flags |= MAP_ALIGN; 2935 addr = (char*) alignment_hint; 2936 } 2937 2938 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2939 // uncommitted page. Otherwise, the read/write might succeed if we 2940 // have enough swap space to back the physical page. 2941 return mmap_chunk(addr, bytes, flags, PROT_NONE); 2942} 2943 2944char* os::reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) { 2945 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL)); 2946 2947 guarantee(requested_addr == NULL || requested_addr == addr, 2948 "OS failed to return requested mmap address."); 2949 return addr; 2950} 2951 2952// Reserve memory at an arbitrary address, only if that area is 2953// available (and not reserved for something else). 2954 2955char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2956 const int max_tries = 10; 2957 char* base[max_tries]; 2958 size_t size[max_tries]; 2959 2960 // Solaris adds a gap between mmap'ed regions. The size of the gap 2961 // is dependent on the requested size and the MMU. Our initial gap 2962 // value here is just a guess and will be corrected later. 2963 bool had_top_overlap = false; 2964 bool have_adjusted_gap = false; 2965 size_t gap = 0x400000; 2966 2967 // Assert only that the size is a multiple of the page size, since 2968 // that's all that mmap requires, and since that's all we really know 2969 // about at this low abstraction level. If we need higher alignment, 2970 // we can either pass an alignment to this method or verify alignment 2971 // in one of the methods further up the call chain. See bug 5044738. 2972 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2973 2974 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 2975 // Give it a try, if the kernel honors the hint we can return immediately. 2976 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 2977 volatile int err = errno; 2978 if (addr == requested_addr) { 2979 return addr; 2980 } else if (addr != NULL) { 2981 unmap_memory(addr, bytes); 2982 } 2983 2984 if (PrintMiscellaneous && Verbose) { 2985 char buf[256]; 2986 buf[0] = '\0'; 2987 if (addr == NULL) { 2988 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err)); 2989 } 2990 warning("attempt_reserve_memory_at: couldn't reserve %d bytes at " 2991 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT 2992 "%s", bytes, requested_addr, addr, buf); 2993 } 2994 2995 // Address hint method didn't work. Fall back to the old method. 2996 // In theory, once SNV becomes our oldest supported platform, this 2997 // code will no longer be needed. 2998 // 2999 // Repeatedly allocate blocks until the block is allocated at the 3000 // right spot. Give up after max_tries. 3001 int i; 3002 for (i = 0; i < max_tries; ++i) { 3003 base[i] = reserve_memory(bytes); 3004 3005 if (base[i] != NULL) { 3006 // Is this the block we wanted? 3007 if (base[i] == requested_addr) { 3008 size[i] = bytes; 3009 break; 3010 } 3011 3012 // check that the gap value is right 3013 if (had_top_overlap && !have_adjusted_gap) { 3014 size_t actual_gap = base[i-1] - base[i] - bytes; 3015 if (gap != actual_gap) { 3016 // adjust the gap value and retry the last 2 allocations 3017 assert(i > 0, "gap adjustment code problem"); 3018 have_adjusted_gap = true; // adjust the gap only once, just in case 3019 gap = actual_gap; 3020 if (PrintMiscellaneous && Verbose) { 3021 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap); 3022 } 3023 unmap_memory(base[i], bytes); 3024 unmap_memory(base[i-1], size[i-1]); 3025 i-=2; 3026 continue; 3027 } 3028 } 3029 3030 // Does this overlap the block we wanted? Give back the overlapped 3031 // parts and try again. 3032 // 3033 // There is still a bug in this code: if top_overlap == bytes, 3034 // the overlap is offset from requested region by the value of gap. 3035 // In this case giving back the overlapped part will not work, 3036 // because we'll give back the entire block at base[i] and 3037 // therefore the subsequent allocation will not generate a new gap. 3038 // This could be fixed with a new algorithm that used larger 3039 // or variable size chunks to find the requested region - 3040 // but such a change would introduce additional complications. 3041 // It's rare enough that the planets align for this bug, 3042 // so we'll just wait for a fix for 6204603/5003415 which 3043 // will provide a mmap flag to allow us to avoid this business. 3044 3045 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 3046 if (top_overlap >= 0 && top_overlap < bytes) { 3047 had_top_overlap = true; 3048 unmap_memory(base[i], top_overlap); 3049 base[i] += top_overlap; 3050 size[i] = bytes - top_overlap; 3051 } else { 3052 size_t bottom_overlap = base[i] + bytes - requested_addr; 3053 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 3054 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) { 3055 warning("attempt_reserve_memory_at: possible alignment bug"); 3056 } 3057 unmap_memory(requested_addr, bottom_overlap); 3058 size[i] = bytes - bottom_overlap; 3059 } else { 3060 size[i] = bytes; 3061 } 3062 } 3063 } 3064 } 3065 3066 // Give back the unused reserved pieces. 3067 3068 for (int j = 0; j < i; ++j) { 3069 if (base[j] != NULL) { 3070 unmap_memory(base[j], size[j]); 3071 } 3072 } 3073 3074 return (i < max_tries) ? requested_addr : NULL; 3075} 3076 3077bool os::release_memory(char* addr, size_t bytes) { 3078 size_t size = bytes; 3079 return munmap(addr, size) == 0; 3080} 3081 3082static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 3083 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()), 3084 "addr must be page aligned"); 3085 int retVal = mprotect(addr, bytes, prot); 3086 return retVal == 0; 3087} 3088 3089// Protect memory (Used to pass readonly pages through 3090// JNI GetArray<type>Elements with empty arrays.) 3091// Also, used for serialization page and for compressed oops null pointer 3092// checking. 3093bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3094 bool is_committed) { 3095 unsigned int p = 0; 3096 switch (prot) { 3097 case MEM_PROT_NONE: p = PROT_NONE; break; 3098 case MEM_PROT_READ: p = PROT_READ; break; 3099 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 3100 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 3101 default: 3102 ShouldNotReachHere(); 3103 } 3104 // is_committed is unused. 3105 return solaris_mprotect(addr, bytes, p); 3106} 3107 3108// guard_memory and unguard_memory only happens within stack guard pages. 3109// Since ISM pertains only to the heap, guard and unguard memory should not 3110/// happen with an ISM region. 3111bool os::guard_memory(char* addr, size_t bytes) { 3112 return solaris_mprotect(addr, bytes, PROT_NONE); 3113} 3114 3115bool os::unguard_memory(char* addr, size_t bytes) { 3116 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); 3117} 3118 3119// Large page support 3120 3121// UseLargePages is the master flag to enable/disable large page memory. 3122// UseMPSS and UseISM are supported for compatibility reasons. Their combined 3123// effects can be described in the following table: 3124// 3125// UseLargePages UseMPSS UseISM 3126// false * * => UseLargePages is the master switch, turning 3127// it off will turn off both UseMPSS and 3128// UseISM. VM will not use large page memory 3129// regardless the settings of UseMPSS/UseISM. 3130// true false false => Unless future Solaris provides other 3131// mechanism to use large page memory, this 3132// combination is equivalent to -UseLargePages, 3133// VM will not use large page memory 3134// true true false => JVM will use MPSS for large page memory. 3135// This is the default behavior. 3136// true false true => JVM will use ISM for large page memory. 3137// true true true => JVM will use ISM if it is available. 3138// Otherwise, JVM will fall back to MPSS. 3139// Becaues ISM is now available on all 3140// supported Solaris versions, this combination 3141// is equivalent to +UseISM -UseMPSS. 3142 3143typedef int (*getpagesizes_func_type) (size_t[], int); 3144static size_t _large_page_size = 0; 3145 3146bool os::Solaris::ism_sanity_check(bool warn, size_t * page_size) { 3147 // x86 uses either 2M or 4M page, depending on whether PAE (Physical Address 3148 // Extensions) mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. Sparc 3149 // can support multiple page sizes. 3150 3151 // Don't bother to probe page size because getpagesizes() comes with MPSS. 3152 // ISM is only recommended on old Solaris where there is no MPSS support. 3153 // Simply choose a conservative value as default. 3154 *page_size = LargePageSizeInBytes ? LargePageSizeInBytes : 3155 SPARC_ONLY(4 * M) IA32_ONLY(4 * M) AMD64_ONLY(2 * M) 3156 ARM_ONLY(2 * M); 3157 3158 // ISM is available on all supported Solaris versions 3159 return true; 3160} 3161 3162// Insertion sort for small arrays (descending order). 3163static void insertion_sort_descending(size_t* array, int len) { 3164 for (int i = 0; i < len; i++) { 3165 size_t val = array[i]; 3166 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 3167 size_t tmp = array[key]; 3168 array[key] = array[key - 1]; 3169 array[key - 1] = tmp; 3170 } 3171 } 3172} 3173 3174bool os::Solaris::mpss_sanity_check(bool warn, size_t * page_size) { 3175 getpagesizes_func_type getpagesizes_func = 3176 CAST_TO_FN_PTR(getpagesizes_func_type, dlsym(RTLD_DEFAULT, "getpagesizes")); 3177 if (getpagesizes_func == NULL) { 3178 if (warn) { 3179 warning("MPSS is not supported by the operating system."); 3180 } 3181 return false; 3182 } 3183 3184 const unsigned int usable_count = VM_Version::page_size_count(); 3185 if (usable_count == 1) { 3186 return false; 3187 } 3188 3189 // Fill the array of page sizes. 3190 int n = getpagesizes_func(_page_sizes, page_sizes_max); 3191 assert(n > 0, "Solaris bug?"); 3192 if (n == page_sizes_max) { 3193 // Add a sentinel value (necessary only if the array was completely filled 3194 // since it is static (zeroed at initialization)). 3195 _page_sizes[--n] = 0; 3196 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 3197 } 3198 assert(_page_sizes[n] == 0, "missing sentinel"); 3199 3200 if (n == 1) return false; // Only one page size available. 3201 3202 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 3203 // select up to usable_count elements. First sort the array, find the first 3204 // acceptable value, then copy the usable sizes to the top of the array and 3205 // trim the rest. Make sure to include the default page size :-). 3206 // 3207 // A better policy could get rid of the 4M limit by taking the sizes of the 3208 // important VM memory regions (java heap and possibly the code cache) into 3209 // account. 3210 insertion_sort_descending(_page_sizes, n); 3211 const size_t size_limit = 3212 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 3213 int beg; 3214 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ; 3215 const int end = MIN2((int)usable_count, n) - 1; 3216 for (int cur = 0; cur < end; ++cur, ++beg) { 3217 _page_sizes[cur] = _page_sizes[beg]; 3218 } 3219 _page_sizes[end] = vm_page_size(); 3220 _page_sizes[end + 1] = 0; 3221 3222 if (_page_sizes[end] > _page_sizes[end - 1]) { 3223 // Default page size is not the smallest; sort again. 3224 insertion_sort_descending(_page_sizes, end + 1); 3225 } 3226 *page_size = _page_sizes[0]; 3227 3228 return true; 3229} 3230 3231bool os::large_page_init() { 3232 if (!UseLargePages) { 3233 UseISM = false; 3234 UseMPSS = false; 3235 return false; 3236 } 3237 3238 // print a warning if any large page related flag is specified on command line 3239 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 3240 !FLAG_IS_DEFAULT(UseISM) || 3241 !FLAG_IS_DEFAULT(UseMPSS) || 3242 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 3243 UseISM = UseISM && 3244 Solaris::ism_sanity_check(warn_on_failure, &_large_page_size); 3245 if (UseISM) { 3246 // ISM disables MPSS to be compatible with old JDK behavior 3247 UseMPSS = false; 3248 _page_sizes[0] = _large_page_size; 3249 _page_sizes[1] = vm_page_size(); 3250 } 3251 3252 UseMPSS = UseMPSS && 3253 Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 3254 3255 UseLargePages = UseISM || UseMPSS; 3256 return UseLargePages; 3257} 3258 3259bool os::Solaris::set_mpss_range(caddr_t start, size_t bytes, size_t align) { 3260 // Signal to OS that we want large pages for addresses 3261 // from addr, addr + bytes 3262 struct memcntl_mha mpss_struct; 3263 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 3264 mpss_struct.mha_pagesize = align; 3265 mpss_struct.mha_flags = 0; 3266 if (memcntl(start, bytes, MC_HAT_ADVISE, 3267 (caddr_t) &mpss_struct, 0, 0) < 0) { 3268 debug_only(warning("Attempt to use MPSS failed.")); 3269 return false; 3270 } 3271 return true; 3272} 3273 3274char* os::reserve_memory_special(size_t bytes, char* addr, bool exec) { 3275 // "exec" is passed in but not used. Creating the shared image for 3276 // the code cache doesn't have an SHM_X executable permission to check. 3277 assert(UseLargePages && UseISM, "only for ISM large pages"); 3278 3279 size_t size = bytes; 3280 char* retAddr = NULL; 3281 int shmid; 3282 key_t ismKey; 3283 3284 bool warn_on_failure = UseISM && 3285 (!FLAG_IS_DEFAULT(UseLargePages) || 3286 !FLAG_IS_DEFAULT(UseISM) || 3287 !FLAG_IS_DEFAULT(LargePageSizeInBytes) 3288 ); 3289 char msg[128]; 3290 3291 ismKey = IPC_PRIVATE; 3292 3293 // Create a large shared memory region to attach to based on size. 3294 // Currently, size is the total size of the heap 3295 shmid = shmget(ismKey, size, SHM_R | SHM_W | IPC_CREAT); 3296 if (shmid == -1){ 3297 if (warn_on_failure) { 3298 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); 3299 warning(msg); 3300 } 3301 return NULL; 3302 } 3303 3304 // Attach to the region 3305 retAddr = (char *) shmat(shmid, 0, SHM_SHARE_MMU | SHM_R | SHM_W); 3306 int err = errno; 3307 3308 // Remove shmid. If shmat() is successful, the actual shared memory segment 3309 // will be deleted when it's detached by shmdt() or when the process 3310 // terminates. If shmat() is not successful this will remove the shared 3311 // segment immediately. 3312 shmctl(shmid, IPC_RMID, NULL); 3313 3314 if (retAddr == (char *) -1) { 3315 if (warn_on_failure) { 3316 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); 3317 warning(msg); 3318 } 3319 return NULL; 3320 } 3321 3322 return retAddr; 3323} 3324 3325bool os::release_memory_special(char* base, size_t bytes) { 3326 // detaching the SHM segment will also delete it, see reserve_memory_special() 3327 int rslt = shmdt(base); 3328 return rslt == 0; 3329} 3330 3331size_t os::large_page_size() { 3332 return _large_page_size; 3333} 3334 3335// MPSS allows application to commit large page memory on demand; with ISM 3336// the entire memory region must be allocated as shared memory. 3337bool os::can_commit_large_page_memory() { 3338 return UseISM ? false : true; 3339} 3340 3341bool os::can_execute_large_page_memory() { 3342 return UseISM ? false : true; 3343} 3344 3345static int os_sleep(jlong millis, bool interruptible) { 3346 const jlong limit = INT_MAX; 3347 jlong prevtime; 3348 int res; 3349 3350 while (millis > limit) { 3351 if ((res = os_sleep(limit, interruptible)) != OS_OK) 3352 return res; 3353 millis -= limit; 3354 } 3355 3356 // Restart interrupted polls with new parameters until the proper delay 3357 // has been completed. 3358 3359 prevtime = getTimeMillis(); 3360 3361 while (millis > 0) { 3362 jlong newtime; 3363 3364 if (!interruptible) { 3365 // Following assert fails for os::yield_all: 3366 // assert(!thread->is_Java_thread(), "must not be java thread"); 3367 res = poll(NULL, 0, millis); 3368 } else { 3369 JavaThread *jt = JavaThread::current(); 3370 3371 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt, 3372 os::Solaris::clear_interrupted); 3373 } 3374 3375 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for 3376 // thread.Interrupt. 3377 3378 // See c/r 6751923. Poll can return 0 before time 3379 // has elapsed if time is set via clock_settime (as NTP does). 3380 // res == 0 if poll timed out (see man poll RETURN VALUES) 3381 // using the logic below checks that we really did 3382 // sleep at least "millis" if not we'll sleep again. 3383 if( ( res == 0 ) || ((res == OS_ERR) && (errno == EINTR))) { 3384 newtime = getTimeMillis(); 3385 assert(newtime >= prevtime, "time moving backwards"); 3386 /* Doing prevtime and newtime in microseconds doesn't help precision, 3387 and trying to round up to avoid lost milliseconds can result in a 3388 too-short delay. */ 3389 millis -= newtime - prevtime; 3390 if(millis <= 0) 3391 return OS_OK; 3392 prevtime = newtime; 3393 } else 3394 return res; 3395 } 3396 3397 return OS_OK; 3398} 3399 3400// Read calls from inside the vm need to perform state transitions 3401size_t os::read(int fd, void *buf, unsigned int nBytes) { 3402 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted); 3403} 3404 3405int os::sleep(Thread* thread, jlong millis, bool interruptible) { 3406 assert(thread == Thread::current(), "thread consistency check"); 3407 3408 // TODO-FIXME: this should be removed. 3409 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock 3410 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate 3411 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving 3412 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel 3413 // is fooled into believing that the system is making progress. In the code below we block the 3414 // the watcher thread while safepoint is in progress so that it would not appear as though the 3415 // system is making progress. 3416 if (!Solaris::T2_libthread() && 3417 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) { 3418 // We now try to acquire the threads lock. Since this lock is held by the VM thread during 3419 // the entire safepoint, the watcher thread will line up here during the safepoint. 3420 Threads_lock->lock_without_safepoint_check(); 3421 Threads_lock->unlock(); 3422 } 3423 3424 if (thread->is_Java_thread()) { 3425 // This is a JavaThread so we honor the _thread_blocked protocol 3426 // even for sleeps of 0 milliseconds. This was originally done 3427 // as a workaround for bug 4338139. However, now we also do it 3428 // to honor the suspend-equivalent protocol. 3429 3430 JavaThread *jt = (JavaThread *) thread; 3431 ThreadBlockInVM tbivm(jt); 3432 3433 jt->set_suspend_equivalent(); 3434 // cleared by handle_special_suspend_equivalent_condition() or 3435 // java_suspend_self() via check_and_wait_while_suspended() 3436 3437 int ret_code; 3438 if (millis <= 0) { 3439 thr_yield(); 3440 ret_code = 0; 3441 } else { 3442 // The original sleep() implementation did not create an 3443 // OSThreadWaitState helper for sleeps of 0 milliseconds. 3444 // I'm preserving that decision for now. 3445 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); 3446 3447 ret_code = os_sleep(millis, interruptible); 3448 } 3449 3450 // were we externally suspended while we were waiting? 3451 jt->check_and_wait_while_suspended(); 3452 3453 return ret_code; 3454 } 3455 3456 // non-JavaThread from this point on: 3457 3458 if (millis <= 0) { 3459 thr_yield(); 3460 return 0; 3461 } 3462 3463 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 3464 3465 return os_sleep(millis, interruptible); 3466} 3467 3468int os::naked_sleep() { 3469 // %% make the sleep time an integer flag. for now use 1 millisec. 3470 return os_sleep(1, false); 3471} 3472 3473// Sleep forever; naked call to OS-specific sleep; use with CAUTION 3474void os::infinite_sleep() { 3475 while (true) { // sleep forever ... 3476 ::sleep(100); // ... 100 seconds at a time 3477 } 3478} 3479 3480// Used to convert frequent JVM_Yield() to nops 3481bool os::dont_yield() { 3482 if (DontYieldALot) { 3483 static hrtime_t last_time = 0; 3484 hrtime_t diff = getTimeNanos() - last_time; 3485 3486 if (diff < DontYieldALotInterval * 1000000) 3487 return true; 3488 3489 last_time += diff; 3490 3491 return false; 3492 } 3493 else { 3494 return false; 3495 } 3496} 3497 3498// Caveat: Solaris os::yield() causes a thread-state transition whereas 3499// the linux and win32 implementations do not. This should be checked. 3500 3501void os::yield() { 3502 // Yields to all threads with same or greater priority 3503 os::sleep(Thread::current(), 0, false); 3504} 3505 3506// Note that yield semantics are defined by the scheduling class to which 3507// the thread currently belongs. Typically, yield will _not yield to 3508// other equal or higher priority threads that reside on the dispatch queues 3509// of other CPUs. 3510 3511os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; } 3512 3513 3514// On Solaris we found that yield_all doesn't always yield to all other threads. 3515// There have been cases where there is a thread ready to execute but it doesn't 3516// get an lwp as the VM thread continues to spin with sleeps of 1 millisecond. 3517// The 1 millisecond wait doesn't seem long enough for the kernel to issue a 3518// SIGWAITING signal which will cause a new lwp to be created. So we count the 3519// number of times yield_all is called in the one loop and increase the sleep 3520// time after 8 attempts. If this fails too we increase the concurrency level 3521// so that the starving thread would get an lwp 3522 3523void os::yield_all(int attempts) { 3524 // Yields to all threads, including threads with lower priorities 3525 if (attempts == 0) { 3526 os::sleep(Thread::current(), 1, false); 3527 } else { 3528 int iterations = attempts % 30; 3529 if (iterations == 0 && !os::Solaris::T2_libthread()) { 3530 // thr_setconcurrency and _getconcurrency make sense only under T1. 3531 int noofLWPS = thr_getconcurrency(); 3532 if (noofLWPS < (Threads::number_of_threads() + 2)) { 3533 thr_setconcurrency(thr_getconcurrency() + 1); 3534 } 3535 } else if (iterations < 25) { 3536 os::sleep(Thread::current(), 1, false); 3537 } else { 3538 os::sleep(Thread::current(), 10, false); 3539 } 3540 } 3541} 3542 3543// Called from the tight loops to possibly influence time-sharing heuristics 3544void os::loop_breaker(int attempts) { 3545 os::yield_all(attempts); 3546} 3547 3548 3549// Interface for setting lwp priorities. If we are using T2 libthread, 3550// which forces the use of BoundThreads or we manually set UseBoundThreads, 3551// all of our threads will be assigned to real lwp's. Using the thr_setprio 3552// function is meaningless in this mode so we must adjust the real lwp's priority 3553// The routines below implement the getting and setting of lwp priorities. 3554// 3555// Note: There are three priority scales used on Solaris. Java priotities 3556// which range from 1 to 10, libthread "thr_setprio" scale which range 3557// from 0 to 127, and the current scheduling class of the process we 3558// are running in. This is typically from -60 to +60. 3559// The setting of the lwp priorities in done after a call to thr_setprio 3560// so Java priorities are mapped to libthread priorities and we map from 3561// the latter to lwp priorities. We don't keep priorities stored in 3562// Java priorities since some of our worker threads want to set priorities 3563// higher than all Java threads. 3564// 3565// For related information: 3566// (1) man -s 2 priocntl 3567// (2) man -s 4 priocntl 3568// (3) man dispadmin 3569// = librt.so 3570// = libthread/common/rtsched.c - thrp_setlwpprio(). 3571// = ps -cL <pid> ... to validate priority. 3572// = sched_get_priority_min and _max 3573// pthread_create 3574// sched_setparam 3575// pthread_setschedparam 3576// 3577// Assumptions: 3578// + We assume that all threads in the process belong to the same 3579// scheduling class. IE. an homogenous process. 3580// + Must be root or in IA group to change change "interactive" attribute. 3581// Priocntl() will fail silently. The only indication of failure is when 3582// we read-back the value and notice that it hasn't changed. 3583// + Interactive threads enter the runq at the head, non-interactive at the tail. 3584// + For RT, change timeslice as well. Invariant: 3585// constant "priority integral" 3586// Konst == TimeSlice * (60-Priority) 3587// Given a priority, compute appropriate timeslice. 3588// + Higher numerical values have higher priority. 3589 3590// sched class attributes 3591typedef struct { 3592 int schedPolicy; // classID 3593 int maxPrio; 3594 int minPrio; 3595} SchedInfo; 3596 3597 3598static SchedInfo tsLimits, iaLimits, rtLimits; 3599 3600#ifdef ASSERT 3601static int ReadBackValidate = 1; 3602#endif 3603static int myClass = 0; 3604static int myMin = 0; 3605static int myMax = 0; 3606static int myCur = 0; 3607static bool priocntl_enable = false; 3608 3609 3610// Call the version of priocntl suitable for all supported versions 3611// of Solaris. We need to call through this wrapper so that we can 3612// build on Solaris 9 and run on Solaris 8, 9 and 10. 3613// 3614// This code should be removed if we ever stop supporting Solaris 8 3615// and earlier releases. 3616 3617static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg); 3618typedef long (*priocntl_type)(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg); 3619static priocntl_type priocntl_ptr = priocntl_stub; 3620 3621// Stub to set the value of the real pointer, and then call the real 3622// function. 3623 3624static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg) { 3625 // Try Solaris 8- name only. 3626 priocntl_type tmp = (priocntl_type)dlsym(RTLD_DEFAULT, "__priocntl"); 3627 guarantee(tmp != NULL, "priocntl function not found."); 3628 priocntl_ptr = tmp; 3629 return (*priocntl_ptr)(PC_VERSION, idtype, id, cmd, arg); 3630} 3631 3632 3633// lwp_priocntl_init 3634// 3635// Try to determine the priority scale for our process. 3636// 3637// Return errno or 0 if OK. 3638// 3639static 3640int lwp_priocntl_init () 3641{ 3642 int rslt; 3643 pcinfo_t ClassInfo; 3644 pcparms_t ParmInfo; 3645 int i; 3646 3647 if (!UseThreadPriorities) return 0; 3648 3649 // We are using Bound threads, we need to determine our priority ranges 3650 if (os::Solaris::T2_libthread() || UseBoundThreads) { 3651 // If ThreadPriorityPolicy is 1, switch tables 3652 if (ThreadPriorityPolicy == 1) { 3653 for (i = 0 ; i < MaxPriority+1; i++) 3654 os::java_to_os_priority[i] = prio_policy1[i]; 3655 } 3656 } 3657 // Not using Bound Threads, set to ThreadPolicy 1 3658 else { 3659 for ( i = 0 ; i < MaxPriority+1; i++ ) { 3660 os::java_to_os_priority[i] = prio_policy1[i]; 3661 } 3662 return 0; 3663 } 3664 3665 3666 // Get IDs for a set of well-known scheduling classes. 3667 // TODO-FIXME: GETCLINFO returns the current # of classes in the 3668 // the system. We should have a loop that iterates over the 3669 // classID values, which are known to be "small" integers. 3670 3671 strcpy(ClassInfo.pc_clname, "TS"); 3672 ClassInfo.pc_cid = -1; 3673 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3674 if (rslt < 0) return errno; 3675 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 3676 tsLimits.schedPolicy = ClassInfo.pc_cid; 3677 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 3678 tsLimits.minPrio = -tsLimits.maxPrio; 3679 3680 strcpy(ClassInfo.pc_clname, "IA"); 3681 ClassInfo.pc_cid = -1; 3682 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3683 if (rslt < 0) return errno; 3684 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 3685 iaLimits.schedPolicy = ClassInfo.pc_cid; 3686 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 3687 iaLimits.minPrio = -iaLimits.maxPrio; 3688 3689 strcpy(ClassInfo.pc_clname, "RT"); 3690 ClassInfo.pc_cid = -1; 3691 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3692 if (rslt < 0) return errno; 3693 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 3694 rtLimits.schedPolicy = ClassInfo.pc_cid; 3695 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 3696 rtLimits.minPrio = 0; 3697 3698 3699 // Query our "current" scheduling class. 3700 // This will normally be IA,TS or, rarely, RT. 3701 memset (&ParmInfo, 0, sizeof(ParmInfo)); 3702 ParmInfo.pc_cid = PC_CLNULL; 3703 rslt = (*priocntl_ptr) (PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo ); 3704 if ( rslt < 0 ) return errno; 3705 myClass = ParmInfo.pc_cid; 3706 3707 // We now know our scheduling classId, get specific information 3708 // the class. 3709 ClassInfo.pc_cid = myClass; 3710 ClassInfo.pc_clname[0] = 0; 3711 rslt = (*priocntl_ptr) (PC_VERSION, (idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo ); 3712 if ( rslt < 0 ) return errno; 3713 3714 if (ThreadPriorityVerbose) 3715 tty->print_cr ("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 3716 3717 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3718 ParmInfo.pc_cid = PC_CLNULL; 3719 rslt = (*priocntl_ptr)(PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3720 if (rslt < 0) return errno; 3721 3722 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3723 myMin = rtLimits.minPrio; 3724 myMax = rtLimits.maxPrio; 3725 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3726 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3727 myMin = iaLimits.minPrio; 3728 myMax = iaLimits.maxPrio; 3729 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 3730 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3731 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3732 myMin = tsLimits.minPrio; 3733 myMax = tsLimits.maxPrio; 3734 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 3735 } else { 3736 // No clue - punt 3737 if (ThreadPriorityVerbose) 3738 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname); 3739 return EINVAL; // no clue, punt 3740 } 3741 3742 if (ThreadPriorityVerbose) 3743 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax); 3744 3745 priocntl_enable = true; // Enable changing priorities 3746 return 0; 3747} 3748 3749#define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 3750#define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 3751#define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 3752 3753 3754// scale_to_lwp_priority 3755// 3756// Convert from the libthread "thr_setprio" scale to our current 3757// lwp scheduling class scale. 3758// 3759static 3760int scale_to_lwp_priority (int rMin, int rMax, int x) 3761{ 3762 int v; 3763 3764 if (x == 127) return rMax; // avoid round-down 3765 v = (((x*(rMax-rMin)))/128)+rMin; 3766 return v; 3767} 3768 3769 3770// set_lwp_priority 3771// 3772// Set the priority of the lwp. This call should only be made 3773// when using bound threads (T2 threads are bound by default). 3774// 3775int set_lwp_priority (int ThreadID, int lwpid, int newPrio ) 3776{ 3777 int rslt; 3778 int Actual, Expected, prv; 3779 pcparms_t ParmInfo; // for GET-SET 3780#ifdef ASSERT 3781 pcparms_t ReadBack; // for readback 3782#endif 3783 3784 // Set priority via PC_GETPARMS, update, PC_SETPARMS 3785 // Query current values. 3786 // TODO: accelerate this by eliminating the PC_GETPARMS call. 3787 // Cache "pcparms_t" in global ParmCache. 3788 // TODO: elide set-to-same-value 3789 3790 // If something went wrong on init, don't change priorities. 3791 if ( !priocntl_enable ) { 3792 if (ThreadPriorityVerbose) 3793 tty->print_cr("Trying to set priority but init failed, ignoring"); 3794 return EINVAL; 3795 } 3796 3797 3798 // If lwp hasn't started yet, just return 3799 // the _start routine will call us again. 3800 if ( lwpid <= 0 ) { 3801 if (ThreadPriorityVerbose) { 3802 tty->print_cr ("deferring the set_lwp_priority of thread " INTPTR_FORMAT " to %d, lwpid not set", 3803 ThreadID, newPrio); 3804 } 3805 return 0; 3806 } 3807 3808 if (ThreadPriorityVerbose) { 3809 tty->print_cr ("set_lwp_priority(" INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 3810 ThreadID, lwpid, newPrio); 3811 } 3812 3813 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3814 ParmInfo.pc_cid = PC_CLNULL; 3815 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 3816 if (rslt < 0) return errno; 3817 3818 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3819 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 3820 rtInfo->rt_pri = scale_to_lwp_priority (rtLimits.minPrio, rtLimits.maxPrio, newPrio); 3821 rtInfo->rt_tqsecs = RT_NOCHANGE; 3822 rtInfo->rt_tqnsecs = RT_NOCHANGE; 3823 if (ThreadPriorityVerbose) { 3824 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 3825 } 3826 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3827 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3828 int maxClamped = MIN2(iaLimits.maxPrio, (int)iaInfo->ia_uprilim); 3829 iaInfo->ia_upri = scale_to_lwp_priority(iaLimits.minPrio, maxClamped, newPrio); 3830 iaInfo->ia_uprilim = IA_NOCHANGE; 3831 iaInfo->ia_mode = IA_NOCHANGE; 3832 if (ThreadPriorityVerbose) { 3833 tty->print_cr ("IA: [%d...%d] %d->%d\n", 3834 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 3835 } 3836 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3837 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3838 int maxClamped = MIN2(tsLimits.maxPrio, (int)tsInfo->ts_uprilim); 3839 prv = tsInfo->ts_upri; 3840 tsInfo->ts_upri = scale_to_lwp_priority(tsLimits.minPrio, maxClamped, newPrio); 3841 tsInfo->ts_uprilim = IA_NOCHANGE; 3842 if (ThreadPriorityVerbose) { 3843 tty->print_cr ("TS: %d [%d...%d] %d->%d\n", 3844 prv, tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 3845 } 3846 if (prv == tsInfo->ts_upri) return 0; 3847 } else { 3848 if ( ThreadPriorityVerbose ) { 3849 tty->print_cr ("Unknown scheduling class\n"); 3850 } 3851 return EINVAL; // no clue, punt 3852 } 3853 3854 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 3855 if (ThreadPriorityVerbose && rslt) { 3856 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 3857 } 3858 if (rslt < 0) return errno; 3859 3860#ifdef ASSERT 3861 // Sanity check: read back what we just attempted to set. 3862 // In theory it could have changed in the interim ... 3863 // 3864 // The priocntl system call is tricky. 3865 // Sometimes it'll validate the priority value argument and 3866 // return EINVAL if unhappy. At other times it fails silently. 3867 // Readbacks are prudent. 3868 3869 if (!ReadBackValidate) return 0; 3870 3871 memset(&ReadBack, 0, sizeof(pcparms_t)); 3872 ReadBack.pc_cid = PC_CLNULL; 3873 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 3874 assert(rslt >= 0, "priocntl failed"); 3875 Actual = Expected = 0xBAD; 3876 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 3877 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3878 Actual = RTPRI(ReadBack)->rt_pri; 3879 Expected = RTPRI(ParmInfo)->rt_pri; 3880 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3881 Actual = IAPRI(ReadBack)->ia_upri; 3882 Expected = IAPRI(ParmInfo)->ia_upri; 3883 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3884 Actual = TSPRI(ReadBack)->ts_upri; 3885 Expected = TSPRI(ParmInfo)->ts_upri; 3886 } else { 3887 if ( ThreadPriorityVerbose ) { 3888 tty->print_cr("set_lwp_priority: unexpected class in readback: %d\n", ParmInfo.pc_cid); 3889 } 3890 } 3891 3892 if (Actual != Expected) { 3893 if ( ThreadPriorityVerbose ) { 3894 tty->print_cr ("set_lwp_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 3895 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 3896 } 3897 } 3898#endif 3899 3900 return 0; 3901} 3902 3903 3904 3905// Solaris only gives access to 128 real priorities at a time, 3906// so we expand Java's ten to fill this range. This would be better 3907// if we dynamically adjusted relative priorities. 3908// 3909// The ThreadPriorityPolicy option allows us to select 2 different 3910// priority scales. 3911// 3912// ThreadPriorityPolicy=0 3913// Since the Solaris' default priority is MaximumPriority, we do not 3914// set a priority lower than Max unless a priority lower than 3915// NormPriority is requested. 3916// 3917// ThreadPriorityPolicy=1 3918// This mode causes the priority table to get filled with 3919// linear values. NormPriority get's mapped to 50% of the 3920// Maximum priority an so on. This will cause VM threads 3921// to get unfair treatment against other Solaris processes 3922// which do not explicitly alter their thread priorities. 3923// 3924 3925 3926int os::java_to_os_priority[MaxPriority + 1] = { 3927 -99999, // 0 Entry should never be used 3928 3929 0, // 1 MinPriority 3930 32, // 2 3931 64, // 3 3932 3933 96, // 4 3934 127, // 5 NormPriority 3935 127, // 6 3936 3937 127, // 7 3938 127, // 8 3939 127, // 9 NearMaxPriority 3940 3941 127 // 10 MaxPriority 3942}; 3943 3944 3945OSReturn os::set_native_priority(Thread* thread, int newpri) { 3946 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 3947 if ( !UseThreadPriorities ) return OS_OK; 3948 int status = thr_setprio(thread->osthread()->thread_id(), newpri); 3949 if ( os::Solaris::T2_libthread() || (UseBoundThreads && thread->osthread()->is_vm_created()) ) 3950 status |= (set_lwp_priority (thread->osthread()->thread_id(), 3951 thread->osthread()->lwp_id(), newpri )); 3952 return (status == 0) ? OS_OK : OS_ERR; 3953} 3954 3955 3956OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 3957 int p; 3958 if ( !UseThreadPriorities ) { 3959 *priority_ptr = NormalPriority; 3960 return OS_OK; 3961 } 3962 int status = thr_getprio(thread->osthread()->thread_id(), &p); 3963 if (status != 0) { 3964 return OS_ERR; 3965 } 3966 *priority_ptr = p; 3967 return OS_OK; 3968} 3969 3970 3971// Hint to the underlying OS that a task switch would not be good. 3972// Void return because it's a hint and can fail. 3973void os::hint_no_preempt() { 3974 schedctl_start(schedctl_init()); 3975} 3976 3977void os::interrupt(Thread* thread) { 3978 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer"); 3979 3980 OSThread* osthread = thread->osthread(); 3981 3982 int isInterrupted = osthread->interrupted(); 3983 if (!isInterrupted) { 3984 osthread->set_interrupted(true); 3985 OrderAccess::fence(); 3986 // os::sleep() is implemented with either poll (NULL,0,timeout) or 3987 // by parking on _SleepEvent. If the former, thr_kill will unwedge 3988 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper. 3989 ParkEvent * const slp = thread->_SleepEvent ; 3990 if (slp != NULL) slp->unpark() ; 3991 } 3992 3993 // For JSR166: unpark after setting status but before thr_kill -dl 3994 if (thread->is_Java_thread()) { 3995 ((JavaThread*)thread)->parker()->unpark(); 3996 } 3997 3998 // Handle interruptible wait() ... 3999 ParkEvent * const ev = thread->_ParkEvent ; 4000 if (ev != NULL) ev->unpark() ; 4001 4002 // When events are used everywhere for os::sleep, then this thr_kill 4003 // will only be needed if UseVMInterruptibleIO is true. 4004 4005 if (!isInterrupted) { 4006 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt()); 4007 assert_status(status == 0, status, "thr_kill"); 4008 4009 // Bump thread interruption counter 4010 RuntimeService::record_thread_interrupt_signaled_count(); 4011 } 4012} 4013 4014 4015bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 4016 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer"); 4017 4018 OSThread* osthread = thread->osthread(); 4019 4020 bool res = osthread->interrupted(); 4021 4022 // NOTE that since there is no "lock" around these two operations, 4023 // there is the possibility that the interrupted flag will be 4024 // "false" but that the interrupt event will be set. This is 4025 // intentional. The effect of this is that Object.wait() will appear 4026 // to have a spurious wakeup, which is not harmful, and the 4027 // possibility is so rare that it is not worth the added complexity 4028 // to add yet another lock. It has also been recommended not to put 4029 // the interrupted flag into the os::Solaris::Event structure, 4030 // because it hides the issue. 4031 if (res && clear_interrupted) { 4032 osthread->set_interrupted(false); 4033 } 4034 return res; 4035} 4036 4037 4038void os::print_statistics() { 4039} 4040 4041int os::message_box(const char* title, const char* message) { 4042 int i; 4043 fdStream err(defaultStream::error_fd()); 4044 for (i = 0; i < 78; i++) err.print_raw("="); 4045 err.cr(); 4046 err.print_raw_cr(title); 4047 for (i = 0; i < 78; i++) err.print_raw("-"); 4048 err.cr(); 4049 err.print_raw_cr(message); 4050 for (i = 0; i < 78; i++) err.print_raw("="); 4051 err.cr(); 4052 4053 char buf[16]; 4054 // Prevent process from exiting upon "read error" without consuming all CPU 4055 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 4056 4057 return buf[0] == 'y' || buf[0] == 'Y'; 4058} 4059 4060// A lightweight implementation that does not suspend the target thread and 4061// thus returns only a hint. Used for profiling only! 4062ExtendedPC os::get_thread_pc(Thread* thread) { 4063 // Make sure that it is called by the watcher and the Threads lock is owned. 4064 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock"); 4065 // For now, is only used to profile the VM Thread 4066 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 4067 ExtendedPC epc; 4068 4069 GetThreadPC_Callback cb(ProfileVM_lock); 4070 OSThread *osthread = thread->osthread(); 4071 const int time_to_wait = 400; // 400ms wait for initial response 4072 int status = cb.interrupt(thread, time_to_wait); 4073 4074 if (cb.is_done() ) { 4075 epc = cb.addr(); 4076 } else { 4077 DEBUG_ONLY(tty->print_cr("Failed to get pc for thread: %d got %d status", 4078 osthread->thread_id(), status);); 4079 // epc is already NULL 4080 } 4081 return epc; 4082} 4083 4084 4085// This does not do anything on Solaris. This is basically a hook for being 4086// able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 4087void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) { 4088 f(value, method, args, thread); 4089} 4090 4091// This routine may be used by user applications as a "hook" to catch signals. 4092// The user-defined signal handler must pass unrecognized signals to this 4093// routine, and if it returns true (non-zero), then the signal handler must 4094// return immediately. If the flag "abort_if_unrecognized" is true, then this 4095// routine will never retun false (zero), but instead will execute a VM panic 4096// routine kill the process. 4097// 4098// If this routine returns false, it is OK to call it again. This allows 4099// the user-defined signal handler to perform checks either before or after 4100// the VM performs its own checks. Naturally, the user code would be making 4101// a serious error if it tried to handle an exception (such as a null check 4102// or breakpoint) that the VM was generating for its own correct operation. 4103// 4104// This routine may recognize any of the following kinds of signals: 4105// SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 4106// os::Solaris::SIGasync 4107// It should be consulted by handlers for any of those signals. 4108// It explicitly does not recognize os::Solaris::SIGinterrupt 4109// 4110// The caller of this routine must pass in the three arguments supplied 4111// to the function referred to in the "sa_sigaction" (not the "sa_handler") 4112// field of the structure passed to sigaction(). This routine assumes that 4113// the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 4114// 4115// Note that the VM will print warnings if it detects conflicting signal 4116// handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 4117// 4118extern "C" int JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized); 4119 4120 4121void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 4122 JVM_handle_solaris_signal(sig, info, ucVoid, true); 4123} 4124 4125/* Do not delete - if guarantee is ever removed, a signal handler (even empty) 4126 is needed to provoke threads blocked on IO to return an EINTR 4127 Note: this explicitly does NOT call JVM_handle_solaris_signal and 4128 does NOT participate in signal chaining due to requirement for 4129 NOT setting SA_RESTART to make EINTR work. */ 4130extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) { 4131 if (UseSignalChaining) { 4132 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig); 4133 if (actp && actp->sa_handler) { 4134 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs"); 4135 } 4136 } 4137} 4138 4139// This boolean allows users to forward their own non-matching signals 4140// to JVM_handle_solaris_signal, harmlessly. 4141bool os::Solaris::signal_handlers_are_installed = false; 4142 4143// For signal-chaining 4144bool os::Solaris::libjsig_is_loaded = false; 4145typedef struct sigaction *(*get_signal_t)(int); 4146get_signal_t os::Solaris::get_signal_action = NULL; 4147 4148struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 4149 struct sigaction *actp = NULL; 4150 4151 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) { 4152 // Retrieve the old signal handler from libjsig 4153 actp = (*get_signal_action)(sig); 4154 } 4155 if (actp == NULL) { 4156 // Retrieve the preinstalled signal handler from jvm 4157 actp = get_preinstalled_handler(sig); 4158 } 4159 4160 return actp; 4161} 4162 4163static bool call_chained_handler(struct sigaction *actp, int sig, 4164 siginfo_t *siginfo, void *context) { 4165 // Call the old signal handler 4166 if (actp->sa_handler == SIG_DFL) { 4167 // It's more reasonable to let jvm treat it as an unexpected exception 4168 // instead of taking the default action. 4169 return false; 4170 } else if (actp->sa_handler != SIG_IGN) { 4171 if ((actp->sa_flags & SA_NODEFER) == 0) { 4172 // automaticlly block the signal 4173 sigaddset(&(actp->sa_mask), sig); 4174 } 4175 4176 sa_handler_t hand; 4177 sa_sigaction_t sa; 4178 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 4179 // retrieve the chained handler 4180 if (siginfo_flag_set) { 4181 sa = actp->sa_sigaction; 4182 } else { 4183 hand = actp->sa_handler; 4184 } 4185 4186 if ((actp->sa_flags & SA_RESETHAND) != 0) { 4187 actp->sa_handler = SIG_DFL; 4188 } 4189 4190 // try to honor the signal mask 4191 sigset_t oset; 4192 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset); 4193 4194 // call into the chained handler 4195 if (siginfo_flag_set) { 4196 (*sa)(sig, siginfo, context); 4197 } else { 4198 (*hand)(sig); 4199 } 4200 4201 // restore the signal mask 4202 thr_sigsetmask(SIG_SETMASK, &oset, 0); 4203 } 4204 // Tell jvm's signal handler the signal is taken care of. 4205 return true; 4206} 4207 4208bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 4209 bool chained = false; 4210 // signal-chaining 4211 if (UseSignalChaining) { 4212 struct sigaction *actp = get_chained_signal_action(sig); 4213 if (actp != NULL) { 4214 chained = call_chained_handler(actp, sig, siginfo, context); 4215 } 4216 } 4217 return chained; 4218} 4219 4220struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 4221 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized"); 4222 if (preinstalled_sigs[sig] != 0) { 4223 return &chainedsigactions[sig]; 4224 } 4225 return NULL; 4226} 4227 4228void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 4229 4230 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 4231 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized"); 4232 chainedsigactions[sig] = oldAct; 4233 preinstalled_sigs[sig] = 1; 4234} 4235 4236void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) { 4237 // Check for overwrite. 4238 struct sigaction oldAct; 4239 sigaction(sig, (struct sigaction*)NULL, &oldAct); 4240 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4241 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4242 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 4243 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 4244 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 4245 if (AllowUserSignalHandlers || !set_installed) { 4246 // Do not overwrite; user takes responsibility to forward to us. 4247 return; 4248 } else if (UseSignalChaining) { 4249 if (oktochain) { 4250 // save the old handler in jvm 4251 save_preinstalled_handler(sig, oldAct); 4252 } else { 4253 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs."); 4254 } 4255 // libjsig also interposes the sigaction() call below and saves the 4256 // old sigaction on it own. 4257 } else { 4258 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " 4259 "%#lx for signal %d.", (long)oldhand, sig)); 4260 } 4261 } 4262 4263 struct sigaction sigAct; 4264 sigfillset(&(sigAct.sa_mask)); 4265 sigAct.sa_handler = SIG_DFL; 4266 4267 sigAct.sa_sigaction = signalHandler; 4268 // Handle SIGSEGV on alternate signal stack if 4269 // not using stack banging 4270 if (!UseStackBanging && sig == SIGSEGV) { 4271 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 4272 // Interruptible i/o requires SA_RESTART cleared so EINTR 4273 // is returned instead of restarting system calls 4274 } else if (sig == os::Solaris::SIGinterrupt()) { 4275 sigemptyset(&sigAct.sa_mask); 4276 sigAct.sa_handler = NULL; 4277 sigAct.sa_flags = SA_SIGINFO; 4278 sigAct.sa_sigaction = sigINTRHandler; 4279 } else { 4280 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 4281 } 4282 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 4283 4284 sigaction(sig, &sigAct, &oldAct); 4285 4286 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4287 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4288 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 4289} 4290 4291 4292#define DO_SIGNAL_CHECK(sig) \ 4293 if (!sigismember(&check_signal_done, sig)) \ 4294 os::Solaris::check_signal_handler(sig) 4295 4296// This method is a periodic task to check for misbehaving JNI applications 4297// under CheckJNI, we can add any periodic checks here 4298 4299void os::run_periodic_checks() { 4300 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 4301 // thereby preventing a NULL checks. 4302 if(!check_addr0_done) check_addr0_done = check_addr0(tty); 4303 4304 if (check_signals == false) return; 4305 4306 // SEGV and BUS if overridden could potentially prevent 4307 // generation of hs*.log in the event of a crash, debugging 4308 // such a case can be very challenging, so we absolutely 4309 // check for the following for a good measure: 4310 DO_SIGNAL_CHECK(SIGSEGV); 4311 DO_SIGNAL_CHECK(SIGILL); 4312 DO_SIGNAL_CHECK(SIGFPE); 4313 DO_SIGNAL_CHECK(SIGBUS); 4314 DO_SIGNAL_CHECK(SIGPIPE); 4315 DO_SIGNAL_CHECK(SIGXFSZ); 4316 4317 // ReduceSignalUsage allows the user to override these handlers 4318 // see comments at the very top and jvm_solaris.h 4319 if (!ReduceSignalUsage) { 4320 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 4321 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 4322 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 4323 DO_SIGNAL_CHECK(BREAK_SIGNAL); 4324 } 4325 4326 // See comments above for using JVM1/JVM2 and UseAltSigs 4327 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt()); 4328 DO_SIGNAL_CHECK(os::Solaris::SIGasync()); 4329 4330} 4331 4332typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 4333 4334static os_sigaction_t os_sigaction = NULL; 4335 4336void os::Solaris::check_signal_handler(int sig) { 4337 char buf[O_BUFLEN]; 4338 address jvmHandler = NULL; 4339 4340 struct sigaction act; 4341 if (os_sigaction == NULL) { 4342 // only trust the default sigaction, in case it has been interposed 4343 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 4344 if (os_sigaction == NULL) return; 4345 } 4346 4347 os_sigaction(sig, (struct sigaction*)NULL, &act); 4348 4349 address thisHandler = (act.sa_flags & SA_SIGINFO) 4350 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 4351 : CAST_FROM_FN_PTR(address, act.sa_handler) ; 4352 4353 4354 switch(sig) { 4355 case SIGSEGV: 4356 case SIGBUS: 4357 case SIGFPE: 4358 case SIGPIPE: 4359 case SIGXFSZ: 4360 case SIGILL: 4361 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4362 break; 4363 4364 case SHUTDOWN1_SIGNAL: 4365 case SHUTDOWN2_SIGNAL: 4366 case SHUTDOWN3_SIGNAL: 4367 case BREAK_SIGNAL: 4368 jvmHandler = (address)user_handler(); 4369 break; 4370 4371 default: 4372 int intrsig = os::Solaris::SIGinterrupt(); 4373 int asynsig = os::Solaris::SIGasync(); 4374 4375 if (sig == intrsig) { 4376 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler); 4377 } else if (sig == asynsig) { 4378 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4379 } else { 4380 return; 4381 } 4382 break; 4383 } 4384 4385 4386 if (thisHandler != jvmHandler) { 4387 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 4388 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 4389 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 4390 // No need to check this sig any longer 4391 sigaddset(&check_signal_done, sig); 4392 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 4393 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 4394 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig)); 4395 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); 4396 // No need to check this sig any longer 4397 sigaddset(&check_signal_done, sig); 4398 } 4399 4400 // Print all the signal handler state 4401 if (sigismember(&check_signal_done, sig)) { 4402 print_signal_handlers(tty, buf, O_BUFLEN); 4403 } 4404 4405} 4406 4407void os::Solaris::install_signal_handlers() { 4408 bool libjsigdone = false; 4409 signal_handlers_are_installed = true; 4410 4411 // signal-chaining 4412 typedef void (*signal_setting_t)(); 4413 signal_setting_t begin_signal_setting = NULL; 4414 signal_setting_t end_signal_setting = NULL; 4415 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4416 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 4417 if (begin_signal_setting != NULL) { 4418 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4419 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 4420 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 4421 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 4422 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t, 4423 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version")); 4424 libjsig_is_loaded = true; 4425 if (os::Solaris::get_libjsig_version != NULL) { 4426 libjsigversion = (*os::Solaris::get_libjsig_version)(); 4427 } 4428 assert(UseSignalChaining, "should enable signal-chaining"); 4429 } 4430 if (libjsig_is_loaded) { 4431 // Tell libjsig jvm is setting signal handlers 4432 (*begin_signal_setting)(); 4433 } 4434 4435 set_signal_handler(SIGSEGV, true, true); 4436 set_signal_handler(SIGPIPE, true, true); 4437 set_signal_handler(SIGXFSZ, true, true); 4438 set_signal_handler(SIGBUS, true, true); 4439 set_signal_handler(SIGILL, true, true); 4440 set_signal_handler(SIGFPE, true, true); 4441 4442 4443 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) { 4444 4445 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so 4446 // can not register overridable signals which might be > 32 4447 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) { 4448 // Tell libjsig jvm has finished setting signal handlers 4449 (*end_signal_setting)(); 4450 libjsigdone = true; 4451 } 4452 } 4453 4454 // Never ok to chain our SIGinterrupt 4455 set_signal_handler(os::Solaris::SIGinterrupt(), true, false); 4456 set_signal_handler(os::Solaris::SIGasync(), true, true); 4457 4458 if (libjsig_is_loaded && !libjsigdone) { 4459 // Tell libjsig jvm finishes setting signal handlers 4460 (*end_signal_setting)(); 4461 } 4462 4463 // We don't activate signal checker if libjsig is in place, we trust ourselves 4464 // and if UserSignalHandler is installed all bets are off 4465 if (CheckJNICalls) { 4466 if (libjsig_is_loaded) { 4467 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 4468 check_signals = false; 4469 } 4470 if (AllowUserSignalHandlers) { 4471 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 4472 check_signals = false; 4473 } 4474 } 4475} 4476 4477 4478void report_error(const char* file_name, int line_no, const char* title, const char* format, ...); 4479 4480const char * signames[] = { 4481 "SIG0", 4482 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP", 4483 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS", 4484 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM", 4485 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH", 4486 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT", 4487 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU", 4488 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW", 4489 "SIGCANCEL", "SIGLOST" 4490}; 4491 4492const char* os::exception_name(int exception_code, char* buf, size_t size) { 4493 if (0 < exception_code && exception_code <= SIGRTMAX) { 4494 // signal 4495 if (exception_code < sizeof(signames)/sizeof(const char*)) { 4496 jio_snprintf(buf, size, "%s", signames[exception_code]); 4497 } else { 4498 jio_snprintf(buf, size, "SIG%d", exception_code); 4499 } 4500 return buf; 4501 } else { 4502 return NULL; 4503 } 4504} 4505 4506// (Static) wrappers for the new libthread API 4507int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate; 4508int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate; 4509int_fnP_thread_t_i os::Solaris::_thr_setmutator; 4510int_fnP_thread_t os::Solaris::_thr_suspend_mutator; 4511int_fnP_thread_t os::Solaris::_thr_continue_mutator; 4512 4513// (Static) wrapper for getisax(2) call. 4514os::Solaris::getisax_func_t os::Solaris::_getisax = 0; 4515 4516// (Static) wrappers for the liblgrp API 4517os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 4518os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 4519os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 4520os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 4521os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 4522os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; 4523os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 4524os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 4525os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 4526 4527// (Static) wrapper for meminfo() call. 4528os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0; 4529 4530static address resolve_symbol_lazy(const char* name) { 4531 address addr = (address) dlsym(RTLD_DEFAULT, name); 4532 if(addr == NULL) { 4533 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 4534 addr = (address) dlsym(RTLD_NEXT, name); 4535 } 4536 return addr; 4537} 4538 4539static address resolve_symbol(const char* name) { 4540 address addr = resolve_symbol_lazy(name); 4541 if(addr == NULL) { 4542 fatal(dlerror()); 4543 } 4544 return addr; 4545} 4546 4547 4548 4549// isT2_libthread() 4550// 4551// Routine to determine if we are currently using the new T2 libthread. 4552// 4553// We determine if we are using T2 by reading /proc/self/lstatus and 4554// looking for a thread with the ASLWP bit set. If we find this status 4555// bit set, we must assume that we are NOT using T2. The T2 team 4556// has approved this algorithm. 4557// 4558// We need to determine if we are running with the new T2 libthread 4559// since setting native thread priorities is handled differently 4560// when using this library. All threads created using T2 are bound 4561// threads. Calling thr_setprio is meaningless in this case. 4562// 4563bool isT2_libthread() { 4564 static prheader_t * lwpArray = NULL; 4565 static int lwpSize = 0; 4566 static int lwpFile = -1; 4567 lwpstatus_t * that; 4568 char lwpName [128]; 4569 bool isT2 = false; 4570 4571#define ADR(x) ((uintptr_t)(x)) 4572#define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1)))) 4573 4574 lwpFile = open("/proc/self/lstatus", O_RDONLY, 0); 4575 if (lwpFile < 0) { 4576 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n"); 4577 return false; 4578 } 4579 lwpSize = 16*1024; 4580 for (;;) { 4581 lseek (lwpFile, 0, SEEK_SET); 4582 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize); 4583 if (read(lwpFile, lwpArray, lwpSize) < 0) { 4584 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n"); 4585 break; 4586 } 4587 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) { 4588 // We got a good snapshot - now iterate over the list. 4589 int aslwpcount = 0; 4590 for (int i = 0; i < lwpArray->pr_nent; i++ ) { 4591 that = LWPINDEX(lwpArray,i); 4592 if (that->pr_flags & PR_ASLWP) { 4593 aslwpcount++; 4594 } 4595 } 4596 if (aslwpcount == 0) isT2 = true; 4597 break; 4598 } 4599 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize; 4600 FREE_C_HEAP_ARRAY(char, lwpArray); // retry. 4601 } 4602 4603 FREE_C_HEAP_ARRAY(char, lwpArray); 4604 close (lwpFile); 4605 if (ThreadPriorityVerbose) { 4606 if (isT2) tty->print_cr("We are running with a T2 libthread\n"); 4607 else tty->print_cr("We are not running with a T2 libthread\n"); 4608 } 4609 return isT2; 4610} 4611 4612 4613void os::Solaris::libthread_init() { 4614 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 4615 4616 // Determine if we are running with the new T2 libthread 4617 os::Solaris::set_T2_libthread(isT2_libthread()); 4618 4619 lwp_priocntl_init(); 4620 4621 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 4622 if(func == NULL) { 4623 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 4624 // Guarantee that this VM is running on an new enough OS (5.6 or 4625 // later) that it will have a new enough libthread.so. 4626 guarantee(func != NULL, "libthread.so is too old."); 4627 } 4628 4629 // Initialize the new libthread getstate API wrappers 4630 func = resolve_symbol("thr_getstate"); 4631 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func)); 4632 4633 func = resolve_symbol("thr_setstate"); 4634 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func)); 4635 4636 func = resolve_symbol("thr_setmutator"); 4637 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func)); 4638 4639 func = resolve_symbol("thr_suspend_mutator"); 4640 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func)); 4641 4642 func = resolve_symbol("thr_continue_mutator"); 4643 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func)); 4644 4645 int size; 4646 void (*handler_info_func)(address *, int *); 4647 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 4648 handler_info_func(&handler_start, &size); 4649 handler_end = handler_start + size; 4650} 4651 4652 4653int_fnP_mutex_tP os::Solaris::_mutex_lock; 4654int_fnP_mutex_tP os::Solaris::_mutex_trylock; 4655int_fnP_mutex_tP os::Solaris::_mutex_unlock; 4656int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 4657int_fnP_mutex_tP os::Solaris::_mutex_destroy; 4658int os::Solaris::_mutex_scope = USYNC_THREAD; 4659 4660int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 4661int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 4662int_fnP_cond_tP os::Solaris::_cond_signal; 4663int_fnP_cond_tP os::Solaris::_cond_broadcast; 4664int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 4665int_fnP_cond_tP os::Solaris::_cond_destroy; 4666int os::Solaris::_cond_scope = USYNC_THREAD; 4667 4668void os::Solaris::synchronization_init() { 4669 if(UseLWPSynchronization) { 4670 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 4671 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 4672 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 4673 os::Solaris::set_mutex_init(lwp_mutex_init); 4674 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 4675 os::Solaris::set_mutex_scope(USYNC_THREAD); 4676 4677 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 4678 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 4679 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 4680 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 4681 os::Solaris::set_cond_init(lwp_cond_init); 4682 os::Solaris::set_cond_destroy(lwp_cond_destroy); 4683 os::Solaris::set_cond_scope(USYNC_THREAD); 4684 } 4685 else { 4686 os::Solaris::set_mutex_scope(USYNC_THREAD); 4687 os::Solaris::set_cond_scope(USYNC_THREAD); 4688 4689 if(UsePthreads) { 4690 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 4691 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 4692 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 4693 os::Solaris::set_mutex_init(pthread_mutex_default_init); 4694 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 4695 4696 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 4697 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 4698 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 4699 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 4700 os::Solaris::set_cond_init(pthread_cond_default_init); 4701 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 4702 } 4703 else { 4704 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 4705 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 4706 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 4707 os::Solaris::set_mutex_init(::mutex_init); 4708 os::Solaris::set_mutex_destroy(::mutex_destroy); 4709 4710 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 4711 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 4712 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 4713 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 4714 os::Solaris::set_cond_init(::cond_init); 4715 os::Solaris::set_cond_destroy(::cond_destroy); 4716 } 4717 } 4718} 4719 4720bool os::Solaris::liblgrp_init() { 4721 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); 4722 if (handle != NULL) { 4723 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 4724 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 4725 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 4726 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 4727 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 4728 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); 4729 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 4730 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 4731 dlsym(handle, "lgrp_cookie_stale"))); 4732 4733 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 4734 set_lgrp_cookie(c); 4735 return true; 4736 } 4737 return false; 4738} 4739 4740void os::Solaris::misc_sym_init() { 4741 address func; 4742 4743 // getisax 4744 func = resolve_symbol_lazy("getisax"); 4745 if (func != NULL) { 4746 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func); 4747 } 4748 4749 // meminfo 4750 func = resolve_symbol_lazy("meminfo"); 4751 if (func != NULL) { 4752 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func)); 4753 } 4754} 4755 4756uint_t os::Solaris::getisax(uint32_t* array, uint_t n) { 4757 assert(_getisax != NULL, "_getisax not set"); 4758 return _getisax(array, n); 4759} 4760 4761// Symbol doesn't exist in Solaris 8 pset.h 4762#ifndef PS_MYID 4763#define PS_MYID -3 4764#endif 4765 4766// int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 4767typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 4768static pset_getloadavg_type pset_getloadavg_ptr = NULL; 4769 4770void init_pset_getloadavg_ptr(void) { 4771 pset_getloadavg_ptr = 4772 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 4773 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) { 4774 warning("pset_getloadavg function not found"); 4775 } 4776} 4777 4778int os::Solaris::_dev_zero_fd = -1; 4779 4780// this is called _before_ the global arguments have been parsed 4781void os::init(void) { 4782 _initial_pid = getpid(); 4783 4784 max_hrtime = first_hrtime = gethrtime(); 4785 4786 init_random(1234567); 4787 4788 page_size = sysconf(_SC_PAGESIZE); 4789 if (page_size == -1) 4790 fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)", 4791 strerror(errno))); 4792 init_page_sizes((size_t) page_size); 4793 4794 Solaris::initialize_system_info(); 4795 4796 // Initialize misc. symbols as soon as possible, so we can use them 4797 // if we need them. 4798 Solaris::misc_sym_init(); 4799 4800 int fd = open("/dev/zero", O_RDWR); 4801 if (fd < 0) { 4802 fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno))); 4803 } else { 4804 Solaris::set_dev_zero_fd(fd); 4805 4806 // Close on exec, child won't inherit. 4807 fcntl(fd, F_SETFD, FD_CLOEXEC); 4808 } 4809 4810 clock_tics_per_sec = CLK_TCK; 4811 4812 // check if dladdr1() exists; dladdr1 can provide more information than 4813 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 4814 // and is available on linker patches for 5.7 and 5.8. 4815 // libdl.so must have been loaded, this call is just an entry lookup 4816 void * hdl = dlopen("libdl.so", RTLD_NOW); 4817 if (hdl) 4818 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 4819 4820 // (Solaris only) this switches to calls that actually do locking. 4821 ThreadCritical::initialize(); 4822 4823 main_thread = thr_self(); 4824 4825 // Constant minimum stack size allowed. It must be at least 4826 // the minimum of what the OS supports (thr_min_stack()), and 4827 // enough to allow the thread to get to user bytecode execution. 4828 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed); 4829 // If the pagesize of the VM is greater than 8K determine the appropriate 4830 // number of initial guard pages. The user can change this with the 4831 // command line arguments, if needed. 4832 if (vm_page_size() > 8*K) { 4833 StackYellowPages = 1; 4834 StackRedPages = 1; 4835 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size(); 4836 } 4837} 4838 4839// To install functions for atexit system call 4840extern "C" { 4841 static void perfMemory_exit_helper() { 4842 perfMemory_exit(); 4843 } 4844} 4845 4846// this is called _after_ the global arguments have been parsed 4847jint os::init_2(void) { 4848 // try to enable extended file IO ASAP, see 6431278 4849 os::Solaris::try_enable_extended_io(); 4850 4851 // Allocate a single page and mark it as readable for safepoint polling. Also 4852 // use this first mmap call to check support for MAP_ALIGN. 4853 address polling_page = (address)Solaris::mmap_chunk((char*)page_size, 4854 page_size, 4855 MAP_PRIVATE | MAP_ALIGN, 4856 PROT_READ); 4857 if (polling_page == NULL) { 4858 has_map_align = false; 4859 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, 4860 PROT_READ); 4861 } 4862 4863 os::set_polling_page(polling_page); 4864 4865#ifndef PRODUCT 4866 if( Verbose && PrintMiscellaneous ) 4867 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 4868#endif 4869 4870 if (!UseMembar) { 4871 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE ); 4872 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 4873 os::set_memory_serialize_page( mem_serialize_page ); 4874 4875#ifndef PRODUCT 4876 if(Verbose && PrintMiscellaneous) 4877 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 4878#endif 4879} 4880 4881 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init()); 4882 4883 // Check minimum allowable stack size for thread creation and to initialize 4884 // the java system classes, including StackOverflowError - depends on page 4885 // size. Add a page for compiler2 recursion in main thread. 4886 // Add in 2*BytesPerWord times page size to account for VM stack during 4887 // class initialization depending on 32 or 64 bit VM. 4888 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed, 4889 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 4890 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size); 4891 4892 size_t threadStackSizeInBytes = ThreadStackSize * K; 4893 if (threadStackSizeInBytes != 0 && 4894 threadStackSizeInBytes < os::Solaris::min_stack_allowed) { 4895 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk", 4896 os::Solaris::min_stack_allowed/K); 4897 return JNI_ERR; 4898 } 4899 4900 // For 64kbps there will be a 64kb page size, which makes 4901 // the usable default stack size quite a bit less. Increase the 4902 // stack for 64kb (or any > than 8kb) pages, this increases 4903 // virtual memory fragmentation (since we're not creating the 4904 // stack on a power of 2 boundary. The real fix for this 4905 // should be to fix the guard page mechanism. 4906 4907 if (vm_page_size() > 8*K) { 4908 threadStackSizeInBytes = (threadStackSizeInBytes != 0) 4909 ? threadStackSizeInBytes + 4910 ((StackYellowPages + StackRedPages) * vm_page_size()) 4911 : 0; 4912 ThreadStackSize = threadStackSizeInBytes/K; 4913 } 4914 4915 // Make the stack size a multiple of the page size so that 4916 // the yellow/red zones can be guarded. 4917 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 4918 vm_page_size())); 4919 4920 Solaris::libthread_init(); 4921 4922 if (UseNUMA) { 4923 if (!Solaris::liblgrp_init()) { 4924 UseNUMA = false; 4925 } else { 4926 size_t lgrp_limit = os::numa_get_groups_num(); 4927 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit); 4928 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); 4929 FREE_C_HEAP_ARRAY(int, lgrp_ids); 4930 if (lgrp_num < 2) { 4931 // There's only one locality group, disable NUMA. 4932 UseNUMA = false; 4933 } 4934 } 4935 if (!UseNUMA && ForceNUMA) { 4936 UseNUMA = true; 4937 } 4938 } 4939 4940 Solaris::signal_sets_init(); 4941 Solaris::init_signal_mem(); 4942 Solaris::install_signal_handlers(); 4943 4944 if (libjsigversion < JSIG_VERSION_1_4_1) { 4945 Maxlibjsigsigs = OLDMAXSIGNUM; 4946 } 4947 4948 // initialize synchronization primitives to use either thread or 4949 // lwp synchronization (controlled by UseLWPSynchronization) 4950 Solaris::synchronization_init(); 4951 4952 if (MaxFDLimit) { 4953 // set the number of file descriptors to max. print out error 4954 // if getrlimit/setrlimit fails but continue regardless. 4955 struct rlimit nbr_files; 4956 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 4957 if (status != 0) { 4958 if (PrintMiscellaneous && (Verbose || WizardMode)) 4959 perror("os::init_2 getrlimit failed"); 4960 } else { 4961 nbr_files.rlim_cur = nbr_files.rlim_max; 4962 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 4963 if (status != 0) { 4964 if (PrintMiscellaneous && (Verbose || WizardMode)) 4965 perror("os::init_2 setrlimit failed"); 4966 } 4967 } 4968 } 4969 4970 // Initialize HPI. 4971 jint hpi_result = hpi::initialize(); 4972 if (hpi_result != JNI_OK) { 4973 tty->print_cr("There was an error trying to initialize the HPI library."); 4974 return hpi_result; 4975 } 4976 4977 // Calculate theoretical max. size of Threads to guard gainst 4978 // artifical out-of-memory situations, where all available address- 4979 // space has been reserved by thread stacks. Default stack size is 1Mb. 4980 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 4981 JavaThread::stack_size_at_create() : (1*K*K); 4982 assert(pre_thread_stack_size != 0, "Must have a stack"); 4983 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 4984 // we should start doing Virtual Memory banging. Currently when the threads will 4985 // have used all but 200Mb of space. 4986 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 4987 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 4988 4989 // at-exit methods are called in the reverse order of their registration. 4990 // In Solaris 7 and earlier, atexit functions are called on return from 4991 // main or as a result of a call to exit(3C). There can be only 32 of 4992 // these functions registered and atexit() does not set errno. In Solaris 4993 // 8 and later, there is no limit to the number of functions registered 4994 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 4995 // functions are called upon dlclose(3DL) in addition to return from main 4996 // and exit(3C). 4997 4998 if (PerfAllowAtExitRegistration) { 4999 // only register atexit functions if PerfAllowAtExitRegistration is set. 5000 // atexit functions can be delayed until process exit time, which 5001 // can be problematic for embedded VM situations. Embedded VMs should 5002 // call DestroyJavaVM() to assure that VM resources are released. 5003 5004 // note: perfMemory_exit_helper atexit function may be removed in 5005 // the future if the appropriate cleanup code can be added to the 5006 // VM_Exit VMOperation's doit method. 5007 if (atexit(perfMemory_exit_helper) != 0) { 5008 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 5009 } 5010 } 5011 5012 // Init pset_loadavg function pointer 5013 init_pset_getloadavg_ptr(); 5014 5015 return JNI_OK; 5016} 5017 5018void os::init_3(void) { 5019 return; 5020} 5021 5022// Mark the polling page as unreadable 5023void os::make_polling_page_unreadable(void) { 5024 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 ) 5025 fatal("Could not disable polling page"); 5026}; 5027 5028// Mark the polling page as readable 5029void os::make_polling_page_readable(void) { 5030 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 ) 5031 fatal("Could not enable polling page"); 5032}; 5033 5034// OS interface. 5035 5036int os::stat(const char *path, struct stat *sbuf) { 5037 char pathbuf[MAX_PATH]; 5038 if (strlen(path) > MAX_PATH - 1) { 5039 errno = ENAMETOOLONG; 5040 return -1; 5041 } 5042 hpi::native_path(strcpy(pathbuf, path)); 5043 return ::stat(pathbuf, sbuf); 5044} 5045 5046 5047bool os::check_heap(bool force) { return true; } 5048 5049typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr); 5050static vsnprintf_t sol_vsnprintf = NULL; 5051 5052int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) { 5053 if (!sol_vsnprintf) { 5054 //search for the named symbol in the objects that were loaded after libjvm 5055 void* where = RTLD_NEXT; 5056 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL) 5057 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf")); 5058 if (!sol_vsnprintf){ 5059 //search for the named symbol in the objects that were loaded before libjvm 5060 where = RTLD_DEFAULT; 5061 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL) 5062 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf")); 5063 assert(sol_vsnprintf != NULL, "vsnprintf not found"); 5064 } 5065 } 5066 return (*sol_vsnprintf)(buf, count, fmt, argptr); 5067} 5068 5069 5070// Is a (classpath) directory empty? 5071bool os::dir_is_empty(const char* path) { 5072 DIR *dir = NULL; 5073 struct dirent *ptr; 5074 5075 dir = opendir(path); 5076 if (dir == NULL) return true; 5077 5078 /* Scan the directory */ 5079 bool result = true; 5080 char buf[sizeof(struct dirent) + MAX_PATH]; 5081 struct dirent *dbuf = (struct dirent *) buf; 5082 while (result && (ptr = readdir(dir, dbuf)) != NULL) { 5083 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 5084 result = false; 5085 } 5086 } 5087 closedir(dir); 5088 return result; 5089} 5090 5091// create binary file, rewriting existing file if required 5092int os::create_binary_file(const char* path, bool rewrite_existing) { 5093 int oflags = O_WRONLY | O_CREAT; 5094 if (!rewrite_existing) { 5095 oflags |= O_EXCL; 5096 } 5097 return ::open64(path, oflags, S_IREAD | S_IWRITE); 5098} 5099 5100// return current position of file pointer 5101jlong os::current_file_offset(int fd) { 5102 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 5103} 5104 5105// move file pointer to the specified offset 5106jlong os::seek_to_file_offset(int fd, jlong offset) { 5107 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 5108} 5109 5110// Map a block of memory. 5111char* os::map_memory(int fd, const char* file_name, size_t file_offset, 5112 char *addr, size_t bytes, bool read_only, 5113 bool allow_exec) { 5114 int prot; 5115 int flags; 5116 5117 if (read_only) { 5118 prot = PROT_READ; 5119 flags = MAP_SHARED; 5120 } else { 5121 prot = PROT_READ | PROT_WRITE; 5122 flags = MAP_PRIVATE; 5123 } 5124 5125 if (allow_exec) { 5126 prot |= PROT_EXEC; 5127 } 5128 5129 if (addr != NULL) { 5130 flags |= MAP_FIXED; 5131 } 5132 5133 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 5134 fd, file_offset); 5135 if (mapped_address == MAP_FAILED) { 5136 return NULL; 5137 } 5138 return mapped_address; 5139} 5140 5141 5142// Remap a block of memory. 5143char* os::remap_memory(int fd, const char* file_name, size_t file_offset, 5144 char *addr, size_t bytes, bool read_only, 5145 bool allow_exec) { 5146 // same as map_memory() on this OS 5147 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 5148 allow_exec); 5149} 5150 5151 5152// Unmap a block of memory. 5153bool os::unmap_memory(char* addr, size_t bytes) { 5154 return munmap(addr, bytes) == 0; 5155} 5156 5157void os::pause() { 5158 char filename[MAX_PATH]; 5159 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 5160 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 5161 } else { 5162 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 5163 } 5164 5165 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 5166 if (fd != -1) { 5167 struct stat buf; 5168 close(fd); 5169 while (::stat(filename, &buf) == 0) { 5170 (void)::poll(NULL, 0, 100); 5171 } 5172 } else { 5173 jio_fprintf(stderr, 5174 "Could not open pause file '%s', continuing immediately.\n", filename); 5175 } 5176} 5177 5178#ifndef PRODUCT 5179#ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 5180// Turn this on if you need to trace synch operations. 5181// Set RECORD_SYNCH_LIMIT to a large-enough value, 5182// and call record_synch_enable and record_synch_disable 5183// around the computation of interest. 5184 5185void record_synch(char* name, bool returning); // defined below 5186 5187class RecordSynch { 5188 char* _name; 5189 public: 5190 RecordSynch(char* name) :_name(name) 5191 { record_synch(_name, false); } 5192 ~RecordSynch() { record_synch(_name, true); } 5193}; 5194 5195#define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 5196extern "C" ret name params { \ 5197 typedef ret name##_t params; \ 5198 static name##_t* implem = NULL; \ 5199 static int callcount = 0; \ 5200 if (implem == NULL) { \ 5201 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 5202 if (implem == NULL) fatal(dlerror()); \ 5203 } \ 5204 ++callcount; \ 5205 RecordSynch _rs(#name); \ 5206 inner; \ 5207 return implem args; \ 5208} 5209// in dbx, examine callcounts this way: 5210// for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 5211 5212#define CHECK_POINTER_OK(p) \ 5213 (Universe::perm_gen() == NULL || !Universe::is_reserved_heap((oop)(p))) 5214#define CHECK_MU \ 5215 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 5216#define CHECK_CV \ 5217 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 5218#define CHECK_P(p) \ 5219 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 5220 5221#define CHECK_MUTEX(mutex_op) \ 5222CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 5223 5224CHECK_MUTEX( mutex_lock) 5225CHECK_MUTEX( _mutex_lock) 5226CHECK_MUTEX( mutex_unlock) 5227CHECK_MUTEX(_mutex_unlock) 5228CHECK_MUTEX( mutex_trylock) 5229CHECK_MUTEX(_mutex_trylock) 5230 5231#define CHECK_COND(cond_op) \ 5232CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV); 5233 5234CHECK_COND( cond_wait); 5235CHECK_COND(_cond_wait); 5236CHECK_COND(_cond_wait_cancel); 5237 5238#define CHECK_COND2(cond_op) \ 5239CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV); 5240 5241CHECK_COND2( cond_timedwait); 5242CHECK_COND2(_cond_timedwait); 5243CHECK_COND2(_cond_timedwait_cancel); 5244 5245// do the _lwp_* versions too 5246#define mutex_t lwp_mutex_t 5247#define cond_t lwp_cond_t 5248CHECK_MUTEX( _lwp_mutex_lock) 5249CHECK_MUTEX( _lwp_mutex_unlock) 5250CHECK_MUTEX( _lwp_mutex_trylock) 5251CHECK_MUTEX( __lwp_mutex_lock) 5252CHECK_MUTEX( __lwp_mutex_unlock) 5253CHECK_MUTEX( __lwp_mutex_trylock) 5254CHECK_MUTEX(___lwp_mutex_lock) 5255CHECK_MUTEX(___lwp_mutex_unlock) 5256 5257CHECK_COND( _lwp_cond_wait); 5258CHECK_COND( __lwp_cond_wait); 5259CHECK_COND(___lwp_cond_wait); 5260 5261CHECK_COND2( _lwp_cond_timedwait); 5262CHECK_COND2( __lwp_cond_timedwait); 5263#undef mutex_t 5264#undef cond_t 5265 5266CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 5267CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 5268CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 5269CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 5270CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 5271CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 5272CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 5273CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 5274 5275 5276// recording machinery: 5277 5278enum { RECORD_SYNCH_LIMIT = 200 }; 5279char* record_synch_name[RECORD_SYNCH_LIMIT]; 5280void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 5281bool record_synch_returning[RECORD_SYNCH_LIMIT]; 5282thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 5283int record_synch_count = 0; 5284bool record_synch_enabled = false; 5285 5286// in dbx, examine recorded data this way: 5287// for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 5288 5289void record_synch(char* name, bool returning) { 5290 if (record_synch_enabled) { 5291 if (record_synch_count < RECORD_SYNCH_LIMIT) { 5292 record_synch_name[record_synch_count] = name; 5293 record_synch_returning[record_synch_count] = returning; 5294 record_synch_thread[record_synch_count] = thr_self(); 5295 record_synch_arg0ptr[record_synch_count] = &name; 5296 record_synch_count++; 5297 } 5298 // put more checking code here: 5299 // ... 5300 } 5301} 5302 5303void record_synch_enable() { 5304 // start collecting trace data, if not already doing so 5305 if (!record_synch_enabled) record_synch_count = 0; 5306 record_synch_enabled = true; 5307} 5308 5309void record_synch_disable() { 5310 // stop collecting trace data 5311 record_synch_enabled = false; 5312} 5313 5314#endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 5315#endif // PRODUCT 5316 5317const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 5318const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 5319 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 5320 5321 5322// JVMTI & JVM monitoring and management support 5323// The thread_cpu_time() and current_thread_cpu_time() are only 5324// supported if is_thread_cpu_time_supported() returns true. 5325// They are not supported on Solaris T1. 5326 5327// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 5328// are used by JVM M&M and JVMTI to get user+sys or user CPU time 5329// of a thread. 5330// 5331// current_thread_cpu_time() and thread_cpu_time(Thread *) 5332// returns the fast estimate available on the platform. 5333 5334// hrtime_t gethrvtime() return value includes 5335// user time but does not include system time 5336jlong os::current_thread_cpu_time() { 5337 return (jlong) gethrvtime(); 5338} 5339 5340jlong os::thread_cpu_time(Thread *thread) { 5341 // return user level CPU time only to be consistent with 5342 // what current_thread_cpu_time returns. 5343 // thread_cpu_time_info() must be changed if this changes 5344 return os::thread_cpu_time(thread, false /* user time only */); 5345} 5346 5347jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 5348 if (user_sys_cpu_time) { 5349 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 5350 } else { 5351 return os::current_thread_cpu_time(); 5352 } 5353} 5354 5355jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 5356 char proc_name[64]; 5357 int count; 5358 prusage_t prusage; 5359 jlong lwp_time; 5360 int fd; 5361 5362 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 5363 getpid(), 5364 thread->osthread()->lwp_id()); 5365 fd = open(proc_name, O_RDONLY); 5366 if ( fd == -1 ) return -1; 5367 5368 do { 5369 count = pread(fd, 5370 (void *)&prusage.pr_utime, 5371 thr_time_size, 5372 thr_time_off); 5373 } while (count < 0 && errno == EINTR); 5374 close(fd); 5375 if ( count < 0 ) return -1; 5376 5377 if (user_sys_cpu_time) { 5378 // user + system CPU time 5379 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 5380 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 5381 (jlong)prusage.pr_stime.tv_nsec + 5382 (jlong)prusage.pr_utime.tv_nsec; 5383 } else { 5384 // user level CPU time only 5385 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 5386 (jlong)prusage.pr_utime.tv_nsec; 5387 } 5388 5389 return(lwp_time); 5390} 5391 5392void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5393 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5394 info_ptr->may_skip_backward = false; // elapsed time not wall time 5395 info_ptr->may_skip_forward = false; // elapsed time not wall time 5396 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5397} 5398 5399void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5400 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5401 info_ptr->may_skip_backward = false; // elapsed time not wall time 5402 info_ptr->may_skip_forward = false; // elapsed time not wall time 5403 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5404} 5405 5406bool os::is_thread_cpu_time_supported() { 5407 if ( os::Solaris::T2_libthread() || UseBoundThreads ) { 5408 return true; 5409 } else { 5410 return false; 5411 } 5412} 5413 5414// System loadavg support. Returns -1 if load average cannot be obtained. 5415// Return the load average for our processor set if the primitive exists 5416// (Solaris 9 and later). Otherwise just return system wide loadavg. 5417int os::loadavg(double loadavg[], int nelem) { 5418 if (pset_getloadavg_ptr != NULL) { 5419 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 5420 } else { 5421 return ::getloadavg(loadavg, nelem); 5422 } 5423} 5424 5425//--------------------------------------------------------------------------------- 5426 5427static address same_page(address x, address y) { 5428 intptr_t page_bits = -os::vm_page_size(); 5429 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits)) 5430 return x; 5431 else if (x > y) 5432 return (address)(intptr_t(y) | ~page_bits) + 1; 5433 else 5434 return (address)(intptr_t(y) & page_bits); 5435} 5436 5437bool os::find(address addr, outputStream* st) { 5438 Dl_info dlinfo; 5439 memset(&dlinfo, 0, sizeof(dlinfo)); 5440 if (dladdr(addr, &dlinfo)) { 5441#ifdef _LP64 5442 st->print("0x%016lx: ", addr); 5443#else 5444 st->print("0x%08x: ", addr); 5445#endif 5446 if (dlinfo.dli_sname != NULL) 5447 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 5448 else if (dlinfo.dli_fname) 5449 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 5450 else 5451 st->print("<absolute address>"); 5452 if (dlinfo.dli_fname) st->print(" in %s", dlinfo.dli_fname); 5453#ifdef _LP64 5454 if (dlinfo.dli_fbase) st->print(" at 0x%016lx", dlinfo.dli_fbase); 5455#else 5456 if (dlinfo.dli_fbase) st->print(" at 0x%08x", dlinfo.dli_fbase); 5457#endif 5458 st->cr(); 5459 5460 if (Verbose) { 5461 // decode some bytes around the PC 5462 address begin = same_page(addr-40, addr); 5463 address end = same_page(addr+40, addr); 5464 address lowest = (address) dlinfo.dli_sname; 5465 if (!lowest) lowest = (address) dlinfo.dli_fbase; 5466 if (begin < lowest) begin = lowest; 5467 Dl_info dlinfo2; 5468 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr 5469 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) 5470 end = (address) dlinfo2.dli_saddr; 5471 Disassembler::decode(begin, end, st); 5472 } 5473 return true; 5474 } 5475 return false; 5476} 5477 5478// Following function has been added to support HotSparc's libjvm.so running 5479// under Solaris production JDK 1.2.2 / 1.3.0. These came from 5480// src/solaris/hpi/native_threads in the EVM codebase. 5481// 5482// NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 5483// libraries and should thus be removed. We will leave it behind for a while 5484// until we no longer want to able to run on top of 1.3.0 Solaris production 5485// JDK. See 4341971. 5486 5487#define STACK_SLACK 0x800 5488 5489extern "C" { 5490 intptr_t sysThreadAvailableStackWithSlack() { 5491 stack_t st; 5492 intptr_t retval, stack_top; 5493 retval = thr_stksegment(&st); 5494 assert(retval == 0, "incorrect return value from thr_stksegment"); 5495 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 5496 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 5497 stack_top=(intptr_t)st.ss_sp-st.ss_size; 5498 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 5499 } 5500} 5501 5502// Just to get the Kernel build to link on solaris for testing. 5503 5504extern "C" { 5505class ASGCT_CallTrace; 5506void AsyncGetCallTrace(ASGCT_CallTrace *trace, jint depth, void* ucontext) 5507 KERNEL_RETURN; 5508} 5509 5510 5511// ObjectMonitor park-unpark infrastructure ... 5512// 5513// We implement Solaris and Linux PlatformEvents with the 5514// obvious condvar-mutex-flag triple. 5515// Another alternative that works quite well is pipes: 5516// Each PlatformEvent consists of a pipe-pair. 5517// The thread associated with the PlatformEvent 5518// calls park(), which reads from the input end of the pipe. 5519// Unpark() writes into the other end of the pipe. 5520// The write-side of the pipe must be set NDELAY. 5521// Unfortunately pipes consume a large # of handles. 5522// Native solaris lwp_park() and lwp_unpark() work nicely, too. 5523// Using pipes for the 1st few threads might be workable, however. 5524// 5525// park() is permitted to return spuriously. 5526// Callers of park() should wrap the call to park() in 5527// an appropriate loop. A litmus test for the correct 5528// usage of park is the following: if park() were modified 5529// to immediately return 0 your code should still work, 5530// albeit degenerating to a spin loop. 5531// 5532// An interesting optimization for park() is to use a trylock() 5533// to attempt to acquire the mutex. If the trylock() fails 5534// then we know that a concurrent unpark() operation is in-progress. 5535// in that case the park() code could simply set _count to 0 5536// and return immediately. The subsequent park() operation *might* 5537// return immediately. That's harmless as the caller of park() is 5538// expected to loop. By using trylock() we will have avoided a 5539// avoided a context switch caused by contention on the per-thread mutex. 5540// 5541// TODO-FIXME: 5542// 1. Reconcile Doug's JSR166 j.u.c park-unpark with the 5543// objectmonitor implementation. 5544// 2. Collapse the JSR166 parker event, and the 5545// objectmonitor ParkEvent into a single "Event" construct. 5546// 3. In park() and unpark() add: 5547// assert (Thread::current() == AssociatedWith). 5548// 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch. 5549// 1-out-of-N park() operations will return immediately. 5550// 5551// _Event transitions in park() 5552// -1 => -1 : illegal 5553// 1 => 0 : pass - return immediately 5554// 0 => -1 : block 5555// 5556// _Event serves as a restricted-range semaphore. 5557// 5558// Another possible encoding of _Event would be with 5559// explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5560// 5561// TODO-FIXME: add DTRACE probes for: 5562// 1. Tx parks 5563// 2. Ty unparks Tx 5564// 3. Tx resumes from park 5565 5566 5567// value determined through experimentation 5568#define ROUNDINGFIX 11 5569 5570// utility to compute the abstime argument to timedwait. 5571// TODO-FIXME: switch from compute_abstime() to unpackTime(). 5572 5573static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 5574 // millis is the relative timeout time 5575 // abstime will be the absolute timeout time 5576 if (millis < 0) millis = 0; 5577 struct timeval now; 5578 int status = gettimeofday(&now, NULL); 5579 assert(status == 0, "gettimeofday"); 5580 jlong seconds = millis / 1000; 5581 jlong max_wait_period; 5582 5583 if (UseLWPSynchronization) { 5584 // forward port of fix for 4275818 (not sleeping long enough) 5585 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 5586 // _lwp_cond_timedwait() used a round_down algorithm rather 5587 // than a round_up. For millis less than our roundfactor 5588 // it rounded down to 0 which doesn't meet the spec. 5589 // For millis > roundfactor we may return a bit sooner, but 5590 // since we can not accurately identify the patch level and 5591 // this has already been fixed in Solaris 9 and 8 we will 5592 // leave it alone rather than always rounding down. 5593 5594 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 5595 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 5596 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 5597 max_wait_period = 21000000; 5598 } else { 5599 max_wait_period = 50000000; 5600 } 5601 millis %= 1000; 5602 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 5603 seconds = max_wait_period; 5604 } 5605 abstime->tv_sec = now.tv_sec + seconds; 5606 long usec = now.tv_usec + millis * 1000; 5607 if (usec >= 1000000) { 5608 abstime->tv_sec += 1; 5609 usec -= 1000000; 5610 } 5611 abstime->tv_nsec = usec * 1000; 5612 return abstime; 5613} 5614 5615// Test-and-clear _Event, always leaves _Event set to 0, returns immediately. 5616// Conceptually TryPark() should be equivalent to park(0). 5617 5618int os::PlatformEvent::TryPark() { 5619 for (;;) { 5620 const int v = _Event ; 5621 guarantee ((v == 0) || (v == 1), "invariant") ; 5622 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; 5623 } 5624} 5625 5626void os::PlatformEvent::park() { // AKA: down() 5627 // Invariant: Only the thread associated with the Event/PlatformEvent 5628 // may call park(). 5629 int v ; 5630 for (;;) { 5631 v = _Event ; 5632 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 5633 } 5634 guarantee (v >= 0, "invariant") ; 5635 if (v == 0) { 5636 // Do this the hard way by blocking ... 5637 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5638 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 5639 // Only for SPARC >= V8PlusA 5640#if defined(__sparc) && defined(COMPILER2) 5641 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 5642#endif 5643 int status = os::Solaris::mutex_lock(_mutex); 5644 assert_status(status == 0, status, "mutex_lock"); 5645 guarantee (_nParked == 0, "invariant") ; 5646 ++ _nParked ; 5647 while (_Event < 0) { 5648 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 5649 // Treat this the same as if the wait was interrupted 5650 // With usr/lib/lwp going to kernel, always handle ETIME 5651 status = os::Solaris::cond_wait(_cond, _mutex); 5652 if (status == ETIME) status = EINTR ; 5653 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 5654 } 5655 -- _nParked ; 5656 _Event = 0 ; 5657 status = os::Solaris::mutex_unlock(_mutex); 5658 assert_status(status == 0, status, "mutex_unlock"); 5659 } 5660} 5661 5662int os::PlatformEvent::park(jlong millis) { 5663 guarantee (_nParked == 0, "invariant") ; 5664 int v ; 5665 for (;;) { 5666 v = _Event ; 5667 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 5668 } 5669 guarantee (v >= 0, "invariant") ; 5670 if (v != 0) return OS_OK ; 5671 5672 int ret = OS_TIMEOUT; 5673 timestruc_t abst; 5674 compute_abstime (&abst, millis); 5675 5676 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5677 // For Solaris SPARC set fprs.FEF=0 prior to parking. 5678 // Only for SPARC >= V8PlusA 5679#if defined(__sparc) && defined(COMPILER2) 5680 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 5681#endif 5682 int status = os::Solaris::mutex_lock(_mutex); 5683 assert_status(status == 0, status, "mutex_lock"); 5684 guarantee (_nParked == 0, "invariant") ; 5685 ++ _nParked ; 5686 while (_Event < 0) { 5687 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 5688 assert_status(status == 0 || status == EINTR || 5689 status == ETIME || status == ETIMEDOUT, 5690 status, "cond_timedwait"); 5691 if (!FilterSpuriousWakeups) break ; // previous semantics 5692 if (status == ETIME || status == ETIMEDOUT) break ; 5693 // We consume and ignore EINTR and spurious wakeups. 5694 } 5695 -- _nParked ; 5696 if (_Event >= 0) ret = OS_OK ; 5697 _Event = 0 ; 5698 status = os::Solaris::mutex_unlock(_mutex); 5699 assert_status(status == 0, status, "mutex_unlock"); 5700 return ret; 5701} 5702 5703void os::PlatformEvent::unpark() { 5704 int v, AnyWaiters; 5705 5706 // Increment _Event. 5707 // Another acceptable implementation would be to simply swap 1 5708 // into _Event: 5709 // if (Swap (&_Event, 1) < 0) { 5710 // mutex_lock (_mutex) ; AnyWaiters = nParked; mutex_unlock (_mutex) ; 5711 // if (AnyWaiters) cond_signal (_cond) ; 5712 // } 5713 5714 for (;;) { 5715 v = _Event ; 5716 if (v > 0) { 5717 // The LD of _Event could have reordered or be satisfied 5718 // by a read-aside from this processor's write buffer. 5719 // To avoid problems execute a barrier and then 5720 // ratify the value. A degenerate CAS() would also work. 5721 // Viz., CAS (v+0, &_Event, v) == v). 5722 OrderAccess::fence() ; 5723 if (_Event == v) return ; 5724 continue ; 5725 } 5726 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ; 5727 } 5728 5729 // If the thread associated with the event was parked, wake it. 5730 if (v < 0) { 5731 int status ; 5732 // Wait for the thread assoc with the PlatformEvent to vacate. 5733 status = os::Solaris::mutex_lock(_mutex); 5734 assert_status(status == 0, status, "mutex_lock"); 5735 AnyWaiters = _nParked ; 5736 status = os::Solaris::mutex_unlock(_mutex); 5737 assert_status(status == 0, status, "mutex_unlock"); 5738 guarantee (AnyWaiters == 0 || AnyWaiters == 1, "invariant") ; 5739 if (AnyWaiters != 0) { 5740 // We intentional signal *after* dropping the lock 5741 // to avoid a common class of futile wakeups. 5742 status = os::Solaris::cond_signal(_cond); 5743 assert_status(status == 0, status, "cond_signal"); 5744 } 5745 } 5746} 5747 5748// JSR166 5749// ------------------------------------------------------- 5750 5751/* 5752 * The solaris and linux implementations of park/unpark are fairly 5753 * conservative for now, but can be improved. They currently use a 5754 * mutex/condvar pair, plus _counter. 5755 * Park decrements _counter if > 0, else does a condvar wait. Unpark 5756 * sets count to 1 and signals condvar. Only one thread ever waits 5757 * on the condvar. Contention seen when trying to park implies that someone 5758 * is unparking you, so don't wait. And spurious returns are fine, so there 5759 * is no need to track notifications. 5760 */ 5761 5762#define NANOSECS_PER_SEC 1000000000 5763#define NANOSECS_PER_MILLISEC 1000000 5764#define MAX_SECS 100000000 5765 5766/* 5767 * This code is common to linux and solaris and will be moved to a 5768 * common place in dolphin. 5769 * 5770 * The passed in time value is either a relative time in nanoseconds 5771 * or an absolute time in milliseconds. Either way it has to be unpacked 5772 * into suitable seconds and nanoseconds components and stored in the 5773 * given timespec structure. 5774 * Given time is a 64-bit value and the time_t used in the timespec is only 5775 * a signed-32-bit value (except on 64-bit Linux) we have to watch for 5776 * overflow if times way in the future are given. Further on Solaris versions 5777 * prior to 10 there is a restriction (see cond_timedwait) that the specified 5778 * number of seconds, in abstime, is less than current_time + 100,000,000. 5779 * As it will be 28 years before "now + 100000000" will overflow we can 5780 * ignore overflow and just impose a hard-limit on seconds using the value 5781 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 5782 * years from "now". 5783 */ 5784static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 5785 assert (time > 0, "convertTime"); 5786 5787 struct timeval now; 5788 int status = gettimeofday(&now, NULL); 5789 assert(status == 0, "gettimeofday"); 5790 5791 time_t max_secs = now.tv_sec + MAX_SECS; 5792 5793 if (isAbsolute) { 5794 jlong secs = time / 1000; 5795 if (secs > max_secs) { 5796 absTime->tv_sec = max_secs; 5797 } 5798 else { 5799 absTime->tv_sec = secs; 5800 } 5801 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 5802 } 5803 else { 5804 jlong secs = time / NANOSECS_PER_SEC; 5805 if (secs >= MAX_SECS) { 5806 absTime->tv_sec = max_secs; 5807 absTime->tv_nsec = 0; 5808 } 5809 else { 5810 absTime->tv_sec = now.tv_sec + secs; 5811 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 5812 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 5813 absTime->tv_nsec -= NANOSECS_PER_SEC; 5814 ++absTime->tv_sec; // note: this must be <= max_secs 5815 } 5816 } 5817 } 5818 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 5819 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 5820 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 5821 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 5822} 5823 5824void Parker::park(bool isAbsolute, jlong time) { 5825 5826 // Optional fast-path check: 5827 // Return immediately if a permit is available. 5828 if (_counter > 0) { 5829 _counter = 0 ; 5830 OrderAccess::fence(); 5831 return ; 5832 } 5833 5834 // Optional fast-exit: Check interrupt before trying to wait 5835 Thread* thread = Thread::current(); 5836 assert(thread->is_Java_thread(), "Must be JavaThread"); 5837 JavaThread *jt = (JavaThread *)thread; 5838 if (Thread::is_interrupted(thread, false)) { 5839 return; 5840 } 5841 5842 // First, demultiplex/decode time arguments 5843 timespec absTime; 5844 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all 5845 return; 5846 } 5847 if (time > 0) { 5848 // Warning: this code might be exposed to the old Solaris time 5849 // round-down bugs. Grep "roundingFix" for details. 5850 unpackTime(&absTime, isAbsolute, time); 5851 } 5852 5853 // Enter safepoint region 5854 // Beware of deadlocks such as 6317397. 5855 // The per-thread Parker:: _mutex is a classic leaf-lock. 5856 // In particular a thread must never block on the Threads_lock while 5857 // holding the Parker:: mutex. If safepoints are pending both the 5858 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 5859 ThreadBlockInVM tbivm(jt); 5860 5861 // Don't wait if cannot get lock since interference arises from 5862 // unblocking. Also. check interrupt before trying wait 5863 if (Thread::is_interrupted(thread, false) || 5864 os::Solaris::mutex_trylock(_mutex) != 0) { 5865 return; 5866 } 5867 5868 int status ; 5869 5870 if (_counter > 0) { // no wait needed 5871 _counter = 0; 5872 status = os::Solaris::mutex_unlock(_mutex); 5873 assert (status == 0, "invariant") ; 5874 OrderAccess::fence(); 5875 return; 5876 } 5877 5878#ifdef ASSERT 5879 // Don't catch signals while blocked; let the running threads have the signals. 5880 // (This allows a debugger to break into the running thread.) 5881 sigset_t oldsigs; 5882 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals(); 5883 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 5884#endif 5885 5886 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5887 jt->set_suspend_equivalent(); 5888 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 5889 5890 // Do this the hard way by blocking ... 5891 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5892 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 5893 // Only for SPARC >= V8PlusA 5894#if defined(__sparc) && defined(COMPILER2) 5895 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 5896#endif 5897 5898 if (time == 0) { 5899 status = os::Solaris::cond_wait (_cond, _mutex) ; 5900 } else { 5901 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 5902 } 5903 // Note that an untimed cond_wait() can sometimes return ETIME on older 5904 // versions of the Solaris. 5905 assert_status(status == 0 || status == EINTR || 5906 status == ETIME || status == ETIMEDOUT, 5907 status, "cond_timedwait"); 5908 5909#ifdef ASSERT 5910 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL); 5911#endif 5912 _counter = 0 ; 5913 status = os::Solaris::mutex_unlock(_mutex); 5914 assert_status(status == 0, status, "mutex_unlock") ; 5915 5916 // If externally suspended while waiting, re-suspend 5917 if (jt->handle_special_suspend_equivalent_condition()) { 5918 jt->java_suspend_self(); 5919 } 5920 OrderAccess::fence(); 5921} 5922 5923void Parker::unpark() { 5924 int s, status ; 5925 status = os::Solaris::mutex_lock (_mutex) ; 5926 assert (status == 0, "invariant") ; 5927 s = _counter; 5928 _counter = 1; 5929 status = os::Solaris::mutex_unlock (_mutex) ; 5930 assert (status == 0, "invariant") ; 5931 5932 if (s < 1) { 5933 status = os::Solaris::cond_signal (_cond) ; 5934 assert (status == 0, "invariant") ; 5935 } 5936} 5937 5938extern char** environ; 5939 5940// Run the specified command in a separate process. Return its exit value, 5941// or -1 on failure (e.g. can't fork a new process). 5942// Unlike system(), this function can be called from signal handler. It 5943// doesn't block SIGINT et al. 5944int os::fork_and_exec(char* cmd) { 5945 char * argv[4]; 5946 argv[0] = (char *)"sh"; 5947 argv[1] = (char *)"-c"; 5948 argv[2] = cmd; 5949 argv[3] = NULL; 5950 5951 // fork is async-safe, fork1 is not so can't use in signal handler 5952 pid_t pid; 5953 Thread* t = ThreadLocalStorage::get_thread_slow(); 5954 if (t != NULL && t->is_inside_signal_handler()) { 5955 pid = fork(); 5956 } else { 5957 pid = fork1(); 5958 } 5959 5960 if (pid < 0) { 5961 // fork failed 5962 warning("fork failed: %s", strerror(errno)); 5963 return -1; 5964 5965 } else if (pid == 0) { 5966 // child process 5967 5968 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 5969 execve("/usr/bin/sh", argv, environ); 5970 5971 // execve failed 5972 _exit(-1); 5973 5974 } else { 5975 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 5976 // care about the actual exit code, for now. 5977 5978 int status; 5979 5980 // Wait for the child process to exit. This returns immediately if 5981 // the child has already exited. */ 5982 while (waitpid(pid, &status, 0) < 0) { 5983 switch (errno) { 5984 case ECHILD: return 0; 5985 case EINTR: break; 5986 default: return -1; 5987 } 5988 } 5989 5990 if (WIFEXITED(status)) { 5991 // The child exited normally; get its exit code. 5992 return WEXITSTATUS(status); 5993 } else if (WIFSIGNALED(status)) { 5994 // The child exited because of a signal 5995 // The best value to return is 0x80 + signal number, 5996 // because that is what all Unix shells do, and because 5997 // it allows callers to distinguish between process exit and 5998 // process death by signal. 5999 return 0x80 + WTERMSIG(status); 6000 } else { 6001 // Unknown exit code; pass it through 6002 return status; 6003 } 6004 } 6005} 6006 6007// is_headless_jre() 6008// 6009// Test for the existence of libmawt in motif21 or xawt directories 6010// in order to report if we are running in a headless jre 6011// 6012bool os::is_headless_jre() { 6013 struct stat statbuf; 6014 char buf[MAXPATHLEN]; 6015 char libmawtpath[MAXPATHLEN]; 6016 const char *xawtstr = "/xawt/libmawt.so"; 6017 const char *motifstr = "/motif21/libmawt.so"; 6018 char *p; 6019 6020 // Get path to libjvm.so 6021 os::jvm_path(buf, sizeof(buf)); 6022 6023 // Get rid of libjvm.so 6024 p = strrchr(buf, '/'); 6025 if (p == NULL) return false; 6026 else *p = '\0'; 6027 6028 // Get rid of client or server 6029 p = strrchr(buf, '/'); 6030 if (p == NULL) return false; 6031 else *p = '\0'; 6032 6033 // check xawt/libmawt.so 6034 strcpy(libmawtpath, buf); 6035 strcat(libmawtpath, xawtstr); 6036 if (::stat(libmawtpath, &statbuf) == 0) return false; 6037 6038 // check motif21/libmawt.so 6039 strcpy(libmawtpath, buf); 6040 strcat(libmawtpath, motifstr); 6041 if (::stat(libmawtpath, &statbuf) == 0) return false; 6042 6043 return true; 6044} 6045 6046 6047