os_solaris.cpp revision 89:b97de546208e
1/* 2 * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any 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// Some more macros from sys/mman.h that are not present in Solaris 8. 126 127#ifndef MAX_MEMINFO_CNT 128/* 129 * info_req request type definitions for meminfo 130 * request types starting with MEMINFO_V are used for Virtual addresses 131 * and should not be mixed with MEMINFO_PLGRP which is targeted for Physical 132 * addresses 133 */ 134# define MEMINFO_SHIFT 16 135# define MEMINFO_MASK (0xFF << MEMINFO_SHIFT) 136# define MEMINFO_VPHYSICAL (0x01 << MEMINFO_SHIFT) /* get physical addr */ 137# define MEMINFO_VLGRP (0x02 << MEMINFO_SHIFT) /* get lgroup */ 138# define MEMINFO_VPAGESIZE (0x03 << MEMINFO_SHIFT) /* size of phys page */ 139# define MEMINFO_VREPLCNT (0x04 << MEMINFO_SHIFT) /* no. of replica */ 140# define MEMINFO_VREPL (0x05 << MEMINFO_SHIFT) /* physical replica */ 141# define MEMINFO_VREPL_LGRP (0x06 << MEMINFO_SHIFT) /* lgrp of replica */ 142# define MEMINFO_PLGRP (0x07 << MEMINFO_SHIFT) /* lgroup for paddr */ 143 144/* maximum number of addresses meminfo() can process at a time */ 145# define MAX_MEMINFO_CNT 256 146 147/* maximum number of request types */ 148# define MAX_MEMINFO_REQ 31 149#endif 150 151// see thr_setprio(3T) for the basis of these numbers 152#define MinimumPriority 0 153#define NormalPriority 64 154#define MaximumPriority 127 155 156// Values for ThreadPriorityPolicy == 1 157int prio_policy1[MaxPriority+1] = { -99999, 0, 16, 32, 48, 64, 158 80, 96, 112, 124, 127 }; 159 160// System parameters used internally 161static clock_t clock_tics_per_sec = 100; 162 163// For diagnostics to print a message once. see run_periodic_checks 164static bool check_addr0_done = false; 165static sigset_t check_signal_done; 166static bool check_signals = true; 167 168address os::Solaris::handler_start; // start pc of thr_sighndlrinfo 169address os::Solaris::handler_end; // end pc of thr_sighndlrinfo 170 171address os::Solaris::_main_stack_base = NULL; // 4352906 workaround 172 173 174// "default" initializers for missing libc APIs 175extern "C" { 176 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 177 static int lwp_mutex_destroy(mutex_t *mx) { return 0; } 178 179 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 180 static int lwp_cond_destroy(cond_t *cv) { return 0; } 181} 182 183// "default" initializers for pthread-based synchronization 184extern "C" { 185 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 186 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 187} 188 189// Thread Local Storage 190// This is common to all Solaris platforms so it is defined here, 191// in this common file. 192// The declarations are in the os_cpu threadLS*.hpp files. 193// 194// Static member initialization for TLS 195Thread* ThreadLocalStorage::_get_thread_cache[ThreadLocalStorage::_pd_cache_size] = {NULL}; 196 197#ifndef PRODUCT 198#define _PCT(n,d) ((100.0*(double)(n))/(double)(d)) 199 200int ThreadLocalStorage::_tcacheHit = 0; 201int ThreadLocalStorage::_tcacheMiss = 0; 202 203void ThreadLocalStorage::print_statistics() { 204 int total = _tcacheMiss+_tcacheHit; 205 tty->print_cr("Thread cache hits %d misses %d total %d percent %f\n", 206 _tcacheHit, _tcacheMiss, total, _PCT(_tcacheHit, total)); 207} 208#undef _PCT 209#endif // PRODUCT 210 211Thread* ThreadLocalStorage::get_thread_via_cache_slowly(uintptr_t raw_id, 212 int index) { 213 Thread *thread = get_thread_slow(); 214 if (thread != NULL) { 215 address sp = os::current_stack_pointer(); 216 guarantee(thread->_stack_base == NULL || 217 (sp <= thread->_stack_base && 218 sp >= thread->_stack_base - thread->_stack_size) || 219 is_error_reported(), 220 "sp must be inside of selected thread stack"); 221 222 thread->_self_raw_id = raw_id; // mark for quick retrieval 223 _get_thread_cache[ index ] = thread; 224 } 225 return thread; 226} 227 228 229static const double all_zero[ sizeof(Thread) / sizeof(double) + 1 ] = {0}; 230#define NO_CACHED_THREAD ((Thread*)all_zero) 231 232void ThreadLocalStorage::pd_set_thread(Thread* thread) { 233 234 // Store the new value before updating the cache to prevent a race 235 // between get_thread_via_cache_slowly() and this store operation. 236 os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread); 237 238 // Update thread cache with new thread if setting on thread create, 239 // or NO_CACHED_THREAD (zeroed) thread if resetting thread on exit. 240 uintptr_t raw = pd_raw_thread_id(); 241 int ix = pd_cache_index(raw); 242 _get_thread_cache[ix] = thread == NULL ? NO_CACHED_THREAD : thread; 243} 244 245void ThreadLocalStorage::pd_init() { 246 for (int i = 0; i < _pd_cache_size; i++) { 247 _get_thread_cache[i] = NO_CACHED_THREAD; 248 } 249} 250 251// Invalidate all the caches (happens to be the same as pd_init). 252void ThreadLocalStorage::pd_invalidate_all() { pd_init(); } 253 254#undef NO_CACHED_THREAD 255 256// END Thread Local Storage 257 258static inline size_t adjust_stack_size(address base, size_t size) { 259 if ((ssize_t)size < 0) { 260 // 4759953: Compensate for ridiculous stack size. 261 size = max_intx; 262 } 263 if (size > (size_t)base) { 264 // 4812466: Make sure size doesn't allow the stack to wrap the address space. 265 size = (size_t)base; 266 } 267 return size; 268} 269 270static inline stack_t get_stack_info() { 271 stack_t st; 272 int retval = thr_stksegment(&st); 273 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size); 274 assert(retval == 0, "incorrect return value from thr_stksegment"); 275 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 276 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 277 return st; 278} 279 280address os::current_stack_base() { 281 int r = thr_main() ; 282 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ; 283 bool is_primordial_thread = r; 284 285 // Workaround 4352906, avoid calls to thr_stksegment by 286 // thr_main after the first one (it looks like we trash 287 // some data, causing the value for ss_sp to be incorrect). 288 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) { 289 stack_t st = get_stack_info(); 290 if (is_primordial_thread) { 291 // cache initial value of stack base 292 os::Solaris::_main_stack_base = (address)st.ss_sp; 293 } 294 return (address)st.ss_sp; 295 } else { 296 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base"); 297 return os::Solaris::_main_stack_base; 298 } 299} 300 301size_t os::current_stack_size() { 302 size_t size; 303 304 int r = thr_main() ; 305 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ; 306 if(!r) { 307 size = get_stack_info().ss_size; 308 } else { 309 struct rlimit limits; 310 getrlimit(RLIMIT_STACK, &limits); 311 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur); 312 } 313 // base may not be page aligned 314 address base = current_stack_base(); 315 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());; 316 return (size_t)(base - bottom); 317} 318 319// interruptible infrastructure 320 321// setup_interruptible saves the thread state before going into an 322// interruptible system call. 323// The saved state is used to restore the thread to 324// its former state whether or not an interrupt is received. 325// Used by classloader os::read 326// hpi calls skip this layer and stay in _thread_in_native 327 328void os::Solaris::setup_interruptible(JavaThread* thread) { 329 330 JavaThreadState thread_state = thread->thread_state(); 331 332 assert(thread_state != _thread_blocked, "Coming from the wrong thread"); 333 assert(thread_state != _thread_in_native, "Native threads skip setup_interruptible"); 334 OSThread* osthread = thread->osthread(); 335 osthread->set_saved_interrupt_thread_state(thread_state); 336 thread->frame_anchor()->make_walkable(thread); 337 ThreadStateTransition::transition(thread, thread_state, _thread_blocked); 338} 339 340// Version of setup_interruptible() for threads that are already in 341// _thread_blocked. Used by os_sleep(). 342void os::Solaris::setup_interruptible_already_blocked(JavaThread* thread) { 343 thread->frame_anchor()->make_walkable(thread); 344} 345 346JavaThread* os::Solaris::setup_interruptible() { 347 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread(); 348 setup_interruptible(thread); 349 return thread; 350} 351 352void os::Solaris::try_enable_extended_io() { 353 typedef int (*enable_extended_FILE_stdio_t)(int, int); 354 355 if (!UseExtendedFileIO) { 356 return; 357 } 358 359 enable_extended_FILE_stdio_t enabler = 360 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT, 361 "enable_extended_FILE_stdio"); 362 if (enabler) { 363 enabler(-1, -1); 364 } 365} 366 367 368#ifdef ASSERT 369 370JavaThread* os::Solaris::setup_interruptible_native() { 371 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread(); 372 JavaThreadState thread_state = thread->thread_state(); 373 assert(thread_state == _thread_in_native, "Assumed thread_in_native"); 374 return thread; 375} 376 377void os::Solaris::cleanup_interruptible_native(JavaThread* thread) { 378 JavaThreadState thread_state = thread->thread_state(); 379 assert(thread_state == _thread_in_native, "Assumed thread_in_native"); 380} 381#endif 382 383// cleanup_interruptible reverses the effects of setup_interruptible 384// setup_interruptible_already_blocked() does not need any cleanup. 385 386void os::Solaris::cleanup_interruptible(JavaThread* thread) { 387 OSThread* osthread = thread->osthread(); 388 389 ThreadStateTransition::transition(thread, _thread_blocked, osthread->saved_interrupt_thread_state()); 390} 391 392// I/O interruption related counters called in _INTERRUPTIBLE 393 394void os::Solaris::bump_interrupted_before_count() { 395 RuntimeService::record_interrupted_before_count(); 396} 397 398void os::Solaris::bump_interrupted_during_count() { 399 RuntimeService::record_interrupted_during_count(); 400} 401 402static int _processors_online = 0; 403 404 jint os::Solaris::_os_thread_limit = 0; 405volatile jint os::Solaris::_os_thread_count = 0; 406 407julong os::available_memory() { 408 return Solaris::available_memory(); 409} 410 411julong os::Solaris::available_memory() { 412 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size(); 413} 414 415julong os::Solaris::_physical_memory = 0; 416 417julong os::physical_memory() { 418 return Solaris::physical_memory(); 419} 420 421julong os::allocatable_physical_memory(julong size) { 422#ifdef _LP64 423 return size; 424#else 425 julong result = MIN2(size, (julong)3835*M); 426 if (!is_allocatable(result)) { 427 // Memory allocations will be aligned but the alignment 428 // is not known at this point. Alignments will 429 // be at most to LargePageSizeInBytes. Protect 430 // allocations from alignments up to illegal 431 // values. If at this point 2G is illegal. 432 julong reasonable_size = (julong)2*G - 2 * LargePageSizeInBytes; 433 result = MIN2(size, reasonable_size); 434 } 435 return result; 436#endif 437} 438 439static hrtime_t first_hrtime = 0; 440static const hrtime_t hrtime_hz = 1000*1000*1000; 441const int LOCK_BUSY = 1; 442const int LOCK_FREE = 0; 443const int LOCK_INVALID = -1; 444static volatile hrtime_t max_hrtime = 0; 445static volatile int max_hrtime_lock = LOCK_FREE; // Update counter with LSB as lock-in-progress 446 447 448void os::Solaris::initialize_system_info() { 449 _processor_count = sysconf(_SC_NPROCESSORS_CONF); 450 _processors_online = sysconf (_SC_NPROCESSORS_ONLN); 451 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE); 452} 453 454int os::active_processor_count() { 455 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 456 pid_t pid = getpid(); 457 psetid_t pset = PS_NONE; 458 // Are we running in a processor set? 459 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) { 460 if (pset != PS_NONE) { 461 uint_t pset_cpus; 462 // Query number of cpus in processor set 463 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) { 464 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check"); 465 _processors_online = pset_cpus; 466 return pset_cpus; 467 } 468 } 469 } 470 // Otherwise return number of online cpus 471 return online_cpus; 472} 473 474static bool find_processors_in_pset(psetid_t pset, 475 processorid_t** id_array, 476 uint_t* id_length) { 477 bool result = false; 478 // Find the number of processors in the processor set. 479 if (pset_info(pset, NULL, id_length, NULL) == 0) { 480 // Make up an array to hold their ids. 481 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length); 482 // Fill in the array with their processor ids. 483 if (pset_info(pset, NULL, id_length, *id_array) == 0) { 484 result = true; 485 } 486 } 487 return result; 488} 489 490// Callers of find_processors_online() must tolerate imprecise results -- 491// the system configuration can change asynchronously because of DR 492// or explicit psradm operations. 493// 494// We also need to take care that the loop (below) terminates as the 495// number of processors online can change between the _SC_NPROCESSORS_ONLN 496// request and the loop that builds the list of processor ids. Unfortunately 497// there's no reliable way to determine the maximum valid processor id, 498// so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online 499// man pages, which claim the processor id set is "sparse, but 500// not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually 501// exit the loop. 502// 503// In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's 504// not available on S8.0. 505 506static bool find_processors_online(processorid_t** id_array, 507 uint* id_length) { 508 const processorid_t MAX_PROCESSOR_ID = 100000 ; 509 // Find the number of processors online. 510 *id_length = sysconf(_SC_NPROCESSORS_ONLN); 511 // Make up an array to hold their ids. 512 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length); 513 // Processors need not be numbered consecutively. 514 long found = 0; 515 processorid_t next = 0; 516 while (found < *id_length && next < MAX_PROCESSOR_ID) { 517 processor_info_t info; 518 if (processor_info(next, &info) == 0) { 519 // NB, PI_NOINTR processors are effectively online ... 520 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) { 521 (*id_array)[found] = next; 522 found += 1; 523 } 524 } 525 next += 1; 526 } 527 if (found < *id_length) { 528 // The loop above didn't identify the expected number of processors. 529 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN) 530 // and re-running the loop, above, but there's no guarantee of progress 531 // if the system configuration is in flux. Instead, we just return what 532 // we've got. Note that in the worst case find_processors_online() could 533 // return an empty set. (As a fall-back in the case of the empty set we 534 // could just return the ID of the current processor). 535 *id_length = found ; 536 } 537 538 return true; 539} 540 541static bool assign_distribution(processorid_t* id_array, 542 uint id_length, 543 uint* distribution, 544 uint distribution_length) { 545 // We assume we can assign processorid_t's to uint's. 546 assert(sizeof(processorid_t) == sizeof(uint), 547 "can't convert processorid_t to uint"); 548 // Quick check to see if we won't succeed. 549 if (id_length < distribution_length) { 550 return false; 551 } 552 // Assign processor ids to the distribution. 553 // Try to shuffle processors to distribute work across boards, 554 // assuming 4 processors per board. 555 const uint processors_per_board = ProcessDistributionStride; 556 // Find the maximum processor id. 557 processorid_t max_id = 0; 558 for (uint m = 0; m < id_length; m += 1) { 559 max_id = MAX2(max_id, id_array[m]); 560 } 561 // The next id, to limit loops. 562 const processorid_t limit_id = max_id + 1; 563 // Make up markers for available processors. 564 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id); 565 for (uint c = 0; c < limit_id; c += 1) { 566 available_id[c] = false; 567 } 568 for (uint a = 0; a < id_length; a += 1) { 569 available_id[id_array[a]] = true; 570 } 571 // Step by "boards", then by "slot", copying to "assigned". 572 // NEEDS_CLEANUP: The assignment of processors should be stateful, 573 // remembering which processors have been assigned by 574 // previous calls, etc., so as to distribute several 575 // independent calls of this method. What we'd like is 576 // It would be nice to have an API that let us ask 577 // how many processes are bound to a processor, 578 // but we don't have that, either. 579 // In the short term, "board" is static so that 580 // subsequent distributions don't all start at board 0. 581 static uint board = 0; 582 uint assigned = 0; 583 // Until we've found enough processors .... 584 while (assigned < distribution_length) { 585 // ... find the next available processor in the board. 586 for (uint slot = 0; slot < processors_per_board; slot += 1) { 587 uint try_id = board * processors_per_board + slot; 588 if ((try_id < limit_id) && (available_id[try_id] == true)) { 589 distribution[assigned] = try_id; 590 available_id[try_id] = false; 591 assigned += 1; 592 break; 593 } 594 } 595 board += 1; 596 if (board * processors_per_board + 0 >= limit_id) { 597 board = 0; 598 } 599 } 600 if (available_id != NULL) { 601 FREE_C_HEAP_ARRAY(bool, available_id); 602 } 603 return true; 604} 605 606bool os::distribute_processes(uint length, uint* distribution) { 607 bool result = false; 608 // Find the processor id's of all the available CPUs. 609 processorid_t* id_array = NULL; 610 uint id_length = 0; 611 // There are some races between querying information and using it, 612 // since processor sets can change dynamically. 613 psetid_t pset = PS_NONE; 614 // Are we running in a processor set? 615 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) { 616 result = find_processors_in_pset(pset, &id_array, &id_length); 617 } else { 618 result = find_processors_online(&id_array, &id_length); 619 } 620 if (result == true) { 621 if (id_length >= length) { 622 result = assign_distribution(id_array, id_length, distribution, length); 623 } else { 624 result = false; 625 } 626 } 627 if (id_array != NULL) { 628 FREE_C_HEAP_ARRAY(processorid_t, id_array); 629 } 630 return result; 631} 632 633bool os::bind_to_processor(uint processor_id) { 634 // We assume that a processorid_t can be stored in a uint. 635 assert(sizeof(uint) == sizeof(processorid_t), 636 "can't convert uint to processorid_t"); 637 int bind_result = 638 processor_bind(P_LWPID, // bind LWP. 639 P_MYID, // bind current LWP. 640 (processorid_t) processor_id, // id. 641 NULL); // don't return old binding. 642 return (bind_result == 0); 643} 644 645bool os::getenv(const char* name, char* buffer, int len) { 646 char* val = ::getenv( name ); 647 if ( val == NULL 648 || strlen(val) + 1 > len ) { 649 if (len > 0) buffer[0] = 0; // return a null string 650 return false; 651 } 652 strcpy( buffer, val ); 653 return true; 654} 655 656 657// Return true if user is running as root. 658 659bool os::have_special_privileges() { 660 static bool init = false; 661 static bool privileges = false; 662 if (!init) { 663 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 664 init = true; 665 } 666 return privileges; 667} 668 669 670static char* get_property(char* name, char* buffer, int buffer_size) { 671 if (os::getenv(name, buffer, buffer_size)) { 672 return buffer; 673 } 674 static char empty[] = ""; 675 return empty; 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 fatal1("os::allocate_thread_local_storage: thr_keycreate failed (%s)", strerror(errno)); 1571 return int(tk); 1572} 1573 1574void os::free_thread_local_storage(int index) { 1575 // %%% don't think we need anything here 1576 // if ( pthread_key_delete((pthread_key_t) tk) ) 1577 // fatal("os::free_thread_local_storage: pthread_key_delete failed"); 1578} 1579 1580#define SMALLINT 32 // libthread allocate for tsd_common is a version specific 1581 // small number - point is NO swap space available 1582void os::thread_local_storage_at_put(int index, void* value) { 1583 // %%% this is used only in threadLocalStorage.cpp 1584 if (thr_setspecific((thread_key_t)index, value)) { 1585 if (errno == ENOMEM) { 1586 vm_exit_out_of_memory(SMALLINT, "thr_setspecific: out of swap space"); 1587 } else { 1588 fatal1("os::thread_local_storage_at_put: thr_setspecific failed (%s)", strerror(errno)); 1589 } 1590 } else { 1591 ThreadLocalStorage::set_thread_in_slot ((Thread *) value) ; 1592 } 1593} 1594 1595// This function could be called before TLS is initialized, for example, when 1596// VM receives an async signal or when VM causes a fatal error during 1597// initialization. Return NULL if thr_getspecific() fails. 1598void* os::thread_local_storage_at(int index) { 1599 // %%% this is used only in threadLocalStorage.cpp 1600 void* r = NULL; 1601 return thr_getspecific((thread_key_t)index, &r) != 0 ? NULL : r; 1602} 1603 1604 1605const int NANOSECS_PER_MILLISECS = 1000000; 1606// gethrtime can move backwards if read from one cpu and then a different cpu 1607// getTimeNanos is guaranteed to not move backward on Solaris 1608// local spinloop created as faster for a CAS on an int than 1609// a CAS on a 64bit jlong. Also Atomic::cmpxchg for jlong is not 1610// supported on sparc v8 or pre supports_cx8 intel boxes. 1611// oldgetTimeNanos for systems which do not support CAS on 64bit jlong 1612// i.e. sparc v8 and pre supports_cx8 (i486) intel boxes 1613inline hrtime_t oldgetTimeNanos() { 1614 int gotlock = LOCK_INVALID; 1615 hrtime_t newtime = gethrtime(); 1616 1617 for (;;) { 1618// grab lock for max_hrtime 1619 int curlock = max_hrtime_lock; 1620 if (curlock & LOCK_BUSY) continue; 1621 if (gotlock = Atomic::cmpxchg(LOCK_BUSY, &max_hrtime_lock, LOCK_FREE) != LOCK_FREE) continue; 1622 if (newtime > max_hrtime) { 1623 max_hrtime = newtime; 1624 } else { 1625 newtime = max_hrtime; 1626 } 1627 // release lock 1628 max_hrtime_lock = LOCK_FREE; 1629 return newtime; 1630 } 1631} 1632// gethrtime can move backwards if read from one cpu and then a different cpu 1633// getTimeNanos is guaranteed to not move backward on Solaris 1634inline hrtime_t getTimeNanos() { 1635 if (VM_Version::supports_cx8()) { 1636 bool retry = false; 1637 hrtime_t newtime = gethrtime(); 1638 hrtime_t oldmaxtime = max_hrtime; 1639 hrtime_t retmaxtime = oldmaxtime; 1640 while ((newtime > retmaxtime) && (retry == false || retmaxtime != oldmaxtime)) { 1641 oldmaxtime = retmaxtime; 1642 retmaxtime = Atomic::cmpxchg(newtime, (volatile jlong *)&max_hrtime, oldmaxtime); 1643 retry = true; 1644 } 1645 return (newtime > retmaxtime) ? newtime : retmaxtime; 1646 } else { 1647 return oldgetTimeNanos(); 1648 } 1649} 1650 1651// Time since start-up in seconds to a fine granularity. 1652// Used by VMSelfDestructTimer and the MemProfiler. 1653double os::elapsedTime() { 1654 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; 1655} 1656 1657jlong os::elapsed_counter() { 1658 return (jlong)(getTimeNanos() - first_hrtime); 1659} 1660 1661jlong os::elapsed_frequency() { 1662 return hrtime_hz; 1663} 1664 1665// Return the real, user, and system times in seconds from an 1666// arbitrary fixed point in the past. 1667bool os::getTimesSecs(double* process_real_time, 1668 double* process_user_time, 1669 double* process_system_time) { 1670 struct tms ticks; 1671 clock_t real_ticks = times(&ticks); 1672 1673 if (real_ticks == (clock_t) (-1)) { 1674 return false; 1675 } else { 1676 double ticks_per_second = (double) clock_tics_per_sec; 1677 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1678 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1679 // For consistency return the real time from getTimeNanos() 1680 // converted to seconds. 1681 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS); 1682 1683 return true; 1684 } 1685} 1686 1687// Used internally for comparisons only 1688// getTimeMillis guaranteed to not move backwards on Solaris 1689jlong getTimeMillis() { 1690 jlong nanotime = getTimeNanos(); 1691 return (jlong)(nanotime / NANOSECS_PER_MILLISECS); 1692} 1693 1694// Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis 1695jlong os::javaTimeMillis() { 1696 timeval t; 1697 if (gettimeofday( &t, NULL) == -1) 1698 fatal1("os::javaTimeMillis: gettimeofday (%s)", strerror(errno)); 1699 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000; 1700} 1701 1702jlong os::javaTimeNanos() { 1703 return (jlong)getTimeNanos(); 1704} 1705 1706void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1707 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits 1708 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1709 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1710 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1711} 1712 1713char * os::local_time_string(char *buf, size_t buflen) { 1714 struct tm t; 1715 time_t long_time; 1716 time(&long_time); 1717 localtime_r(&long_time, &t); 1718 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1719 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1720 t.tm_hour, t.tm_min, t.tm_sec); 1721 return buf; 1722} 1723 1724// Note: os::shutdown() might be called very early during initialization, or 1725// called from signal handler. Before adding something to os::shutdown(), make 1726// sure it is async-safe and can handle partially initialized VM. 1727void os::shutdown() { 1728 1729 // allow PerfMemory to attempt cleanup of any persistent resources 1730 perfMemory_exit(); 1731 1732 // needs to remove object in file system 1733 AttachListener::abort(); 1734 1735 // flush buffered output, finish log files 1736 ostream_abort(); 1737 1738 // Check for abort hook 1739 abort_hook_t abort_hook = Arguments::abort_hook(); 1740 if (abort_hook != NULL) { 1741 abort_hook(); 1742 } 1743} 1744 1745// Note: os::abort() might be called very early during initialization, or 1746// called from signal handler. Before adding something to os::abort(), make 1747// sure it is async-safe and can handle partially initialized VM. 1748void os::abort(bool dump_core) { 1749 os::shutdown(); 1750 if (dump_core) { 1751#ifndef PRODUCT 1752 fdStream out(defaultStream::output_fd()); 1753 out.print_raw("Current thread is "); 1754 char buf[16]; 1755 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1756 out.print_raw_cr(buf); 1757 out.print_raw_cr("Dumping core ..."); 1758#endif 1759 ::abort(); // dump core (for debugging) 1760 } 1761 1762 ::exit(1); 1763} 1764 1765// Die immediately, no exit hook, no abort hook, no cleanup. 1766void os::die() { 1767 _exit(-1); 1768} 1769 1770// unused 1771void os::set_error_file(const char *logfile) {} 1772 1773// DLL functions 1774 1775const char* os::dll_file_extension() { return ".so"; } 1776 1777const char* os::get_temp_directory() { return "/tmp/"; } 1778 1779const char* os::get_current_directory(char *buf, int buflen) { 1780 return getcwd(buf, buflen); 1781} 1782 1783// check if addr is inside libjvm[_g].so 1784bool os::address_is_in_vm(address addr) { 1785 static address libjvm_base_addr; 1786 Dl_info dlinfo; 1787 1788 if (libjvm_base_addr == NULL) { 1789 dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo); 1790 libjvm_base_addr = (address)dlinfo.dli_fbase; 1791 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1792 } 1793 1794 if (dladdr((void *)addr, &dlinfo)) { 1795 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1796 } 1797 1798 return false; 1799} 1800 1801typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int); 1802static dladdr1_func_type dladdr1_func = NULL; 1803 1804bool os::dll_address_to_function_name(address addr, char *buf, 1805 int buflen, int * offset) { 1806 Dl_info dlinfo; 1807 1808 // dladdr1_func was initialized in os::init() 1809 if (dladdr1_func){ 1810 // yes, we have dladdr1 1811 1812 // Support for dladdr1 is checked at runtime; it may be 1813 // available even if the vm is built on a machine that does 1814 // not have dladdr1 support. Make sure there is a value for 1815 // RTLD_DL_SYMENT. 1816 #ifndef RTLD_DL_SYMENT 1817 #define RTLD_DL_SYMENT 1 1818 #endif 1819 Sym * info; 1820 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, 1821 RTLD_DL_SYMENT)) { 1822 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1823 if (offset) *offset = addr - (address)dlinfo.dli_saddr; 1824 1825 // check if the returned symbol really covers addr 1826 return ((char *)dlinfo.dli_saddr + info->st_size > (char *)addr); 1827 } else { 1828 if (buf) buf[0] = '\0'; 1829 if (offset) *offset = -1; 1830 return false; 1831 } 1832 } else { 1833 // no, only dladdr is available 1834 if(dladdr((void *)addr, &dlinfo)) { 1835 if (buf) jio_snprintf(buf, buflen, dlinfo.dli_sname); 1836 if (offset) *offset = addr - (address)dlinfo.dli_saddr; 1837 return true; 1838 } else { 1839 if (buf) buf[0] = '\0'; 1840 if (offset) *offset = -1; 1841 return false; 1842 } 1843 } 1844} 1845 1846bool os::dll_address_to_library_name(address addr, char* buf, 1847 int buflen, int* offset) { 1848 Dl_info dlinfo; 1849 1850 if (dladdr((void*)addr, &dlinfo)){ 1851 if (buf) jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1852 if (offset) *offset = addr - (address)dlinfo.dli_fbase; 1853 return true; 1854 } else { 1855 if (buf) buf[0] = '\0'; 1856 if (offset) *offset = -1; 1857 return false; 1858 } 1859} 1860 1861// Prints the names and full paths of all opened dynamic libraries 1862// for current process 1863void os::print_dll_info(outputStream * st) { 1864 Dl_info dli; 1865 void *handle; 1866 Link_map *map; 1867 Link_map *p; 1868 1869 st->print_cr("Dynamic libraries:"); st->flush(); 1870 1871 if (!dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli)) { 1872 st->print_cr("Error: Cannot print dynamic libraries."); 1873 return; 1874 } 1875 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1876 if (handle == NULL) { 1877 st->print_cr("Error: Cannot print dynamic libraries."); 1878 return; 1879 } 1880 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1881 if (map == NULL) { 1882 st->print_cr("Error: Cannot print dynamic libraries."); 1883 return; 1884 } 1885 1886 while (map->l_prev != NULL) 1887 map = map->l_prev; 1888 1889 while (map != NULL) { 1890 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); 1891 map = map->l_next; 1892 } 1893 1894 dlclose(handle); 1895} 1896 1897 // Loads .dll/.so and 1898 // in case of error it checks if .dll/.so was built for the 1899 // same architecture as Hotspot is running on 1900 1901void * os::dll_load(const char *filename, char *ebuf, int ebuflen) 1902{ 1903 void * result= ::dlopen(filename, RTLD_LAZY); 1904 if (result != NULL) { 1905 // Successful loading 1906 return result; 1907 } 1908 1909 Elf32_Ehdr elf_head; 1910 1911 // Read system error message into ebuf 1912 // It may or may not be overwritten below 1913 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1914 ebuf[ebuflen-1]='\0'; 1915 int diag_msg_max_length=ebuflen-strlen(ebuf); 1916 char* diag_msg_buf=ebuf+strlen(ebuf); 1917 1918 if (diag_msg_max_length==0) { 1919 // No more space in ebuf for additional diagnostics message 1920 return NULL; 1921 } 1922 1923 1924 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1925 1926 if (file_descriptor < 0) { 1927 // Can't open library, report dlerror() message 1928 return NULL; 1929 } 1930 1931 bool failed_to_read_elf_head= 1932 (sizeof(elf_head)!= 1933 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; 1934 1935 ::close(file_descriptor); 1936 if (failed_to_read_elf_head) { 1937 // file i/o error - report dlerror() msg 1938 return NULL; 1939 } 1940 1941 typedef struct { 1942 Elf32_Half code; // Actual value as defined in elf.h 1943 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1944 char elf_class; // 32 or 64 bit 1945 char endianess; // MSB or LSB 1946 char* name; // String representation 1947 } arch_t; 1948 1949 static const arch_t arch_array[]={ 1950 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1951 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1952 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1953 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1954 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1955 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1956 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1957 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1958 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"} 1959 }; 1960 1961 #if (defined IA32) 1962 static Elf32_Half running_arch_code=EM_386; 1963 #elif (defined AMD64) 1964 static Elf32_Half running_arch_code=EM_X86_64; 1965 #elif (defined IA64) 1966 static Elf32_Half running_arch_code=EM_IA_64; 1967 #elif (defined __sparc) && (defined _LP64) 1968 static Elf32_Half running_arch_code=EM_SPARCV9; 1969 #elif (defined __sparc) && (!defined _LP64) 1970 static Elf32_Half running_arch_code=EM_SPARC; 1971 #elif (defined __powerpc64__) 1972 static Elf32_Half running_arch_code=EM_PPC64; 1973 #elif (defined __powerpc__) 1974 static Elf32_Half running_arch_code=EM_PPC; 1975 #else 1976 #error Method os::dll_load requires that one of following is defined:\ 1977 IA32, AMD64, IA64, __sparc, __powerpc__ 1978 #endif 1979 1980 // Identify compatability class for VM's architecture and library's architecture 1981 // Obtain string descriptions for architectures 1982 1983 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1984 int running_arch_index=-1; 1985 1986 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { 1987 if (running_arch_code == arch_array[i].code) { 1988 running_arch_index = i; 1989 } 1990 if (lib_arch.code == arch_array[i].code) { 1991 lib_arch.compat_class = arch_array[i].compat_class; 1992 lib_arch.name = arch_array[i].name; 1993 } 1994 } 1995 1996 assert(running_arch_index != -1, 1997 "Didn't find running architecture code (running_arch_code) in arch_array"); 1998 if (running_arch_index == -1) { 1999 // Even though running architecture detection failed 2000 // we may still continue with reporting dlerror() message 2001 return NULL; 2002 } 2003 2004 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 2005 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 2006 return NULL; 2007 } 2008 2009 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 2010 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 2011 return NULL; 2012 } 2013 2014 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 2015 if ( lib_arch.name!=NULL ) { 2016 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 2017 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 2018 lib_arch.name, arch_array[running_arch_index].name); 2019 } else { 2020 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 2021 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 2022 lib_arch.code, 2023 arch_array[running_arch_index].name); 2024 } 2025 } 2026 2027 return NULL; 2028} 2029 2030 2031 2032bool _print_ascii_file(const char* filename, outputStream* st) { 2033 int fd = open(filename, O_RDONLY); 2034 if (fd == -1) { 2035 return false; 2036 } 2037 2038 char buf[32]; 2039 int bytes; 2040 while ((bytes = read(fd, buf, sizeof(buf))) > 0) { 2041 st->print_raw(buf, bytes); 2042 } 2043 2044 close(fd); 2045 2046 return true; 2047} 2048 2049void os::print_os_info(outputStream* st) { 2050 st->print("OS:"); 2051 2052 if (!_print_ascii_file("/etc/release", st)) { 2053 st->print("Solaris"); 2054 } 2055 st->cr(); 2056 2057 // kernel 2058 st->print("uname:"); 2059 struct utsname name; 2060 uname(&name); 2061 st->print(name.sysname); st->print(" "); 2062 st->print(name.release); st->print(" "); 2063 st->print(name.version); st->print(" "); 2064 st->print(name.machine); 2065 2066 // libthread 2067 if (os::Solaris::T2_libthread()) st->print(" (T2 libthread)"); 2068 else st->print(" (T1 libthread)"); 2069 st->cr(); 2070 2071 // rlimit 2072 st->print("rlimit:"); 2073 struct rlimit rlim; 2074 2075 st->print(" STACK "); 2076 getrlimit(RLIMIT_STACK, &rlim); 2077 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2078 else st->print("%uk", rlim.rlim_cur >> 10); 2079 2080 st->print(", CORE "); 2081 getrlimit(RLIMIT_CORE, &rlim); 2082 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2083 else st->print("%uk", rlim.rlim_cur >> 10); 2084 2085 st->print(", NOFILE "); 2086 getrlimit(RLIMIT_NOFILE, &rlim); 2087 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2088 else st->print("%d", rlim.rlim_cur); 2089 2090 st->print(", AS "); 2091 getrlimit(RLIMIT_AS, &rlim); 2092 if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); 2093 else st->print("%uk", rlim.rlim_cur >> 10); 2094 st->cr(); 2095 2096 // load average 2097 st->print("load average:"); 2098 double loadavg[3]; 2099 os::loadavg(loadavg, 3); 2100 st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); 2101 st->cr(); 2102} 2103 2104 2105static bool check_addr0(outputStream* st) { 2106 jboolean status = false; 2107 int fd = open("/proc/self/map",O_RDONLY); 2108 if (fd >= 0) { 2109 prmap_t p; 2110 while(read(fd, &p, sizeof(p)) > 0) { 2111 if (p.pr_vaddr == 0x0) { 2112 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname); 2113 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname); 2114 st->print("Access:"); 2115 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-"); 2116 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-"); 2117 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-"); 2118 st->cr(); 2119 status = true; 2120 } 2121 close(fd); 2122 } 2123 } 2124 return status; 2125} 2126 2127void os::print_memory_info(outputStream* st) { 2128 st->print("Memory:"); 2129 st->print(" %dk page", os::vm_page_size()>>10); 2130 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 2131 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 2132 st->cr(); 2133 (void) check_addr0(st); 2134} 2135 2136// Taken from /usr/include/sys/machsig.h Supposed to be architecture specific 2137// but they're the same for all the solaris architectures that we support. 2138const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", 2139 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", 2140 "ILL_COPROC", "ILL_BADSTK" }; 2141 2142const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", 2143 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", 2144 "FPE_FLTINV", "FPE_FLTSUB" }; 2145 2146const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; 2147 2148const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; 2149 2150void os::print_siginfo(outputStream* st, void* siginfo) { 2151 st->print("siginfo:"); 2152 2153 const int buflen = 100; 2154 char buf[buflen]; 2155 siginfo_t *si = (siginfo_t*)siginfo; 2156 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); 2157 char *err = strerror(si->si_errno); 2158 if (si->si_errno != 0 && err != NULL) { 2159 st->print("si_errno=%s", err); 2160 } else { 2161 st->print("si_errno=%d", si->si_errno); 2162 } 2163 const int c = si->si_code; 2164 assert(c > 0, "unexpected si_code"); 2165 switch (si->si_signo) { 2166 case SIGILL: 2167 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); 2168 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2169 break; 2170 case SIGFPE: 2171 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); 2172 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2173 break; 2174 case SIGSEGV: 2175 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); 2176 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2177 break; 2178 case SIGBUS: 2179 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); 2180 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2181 break; 2182 default: 2183 st->print(", si_code=%d", si->si_code); 2184 // no si_addr 2185 } 2186 2187 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && 2188 UseSharedSpaces) { 2189 FileMapInfo* mapinfo = FileMapInfo::current_info(); 2190 if (mapinfo->is_in_shared_space(si->si_addr)) { 2191 st->print("\n\nError accessing class data sharing archive." \ 2192 " Mapped file inaccessible during execution, " \ 2193 " possible disk/network problem."); 2194 } 2195 } 2196 st->cr(); 2197} 2198 2199// Moved from whole group, because we need them here for diagnostic 2200// prints. 2201#define OLDMAXSIGNUM 32 2202static int Maxsignum = 0; 2203static int *ourSigFlags = NULL; 2204 2205extern "C" void sigINTRHandler(int, siginfo_t*, void*); 2206 2207int os::Solaris::get_our_sigflags(int sig) { 2208 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 2209 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 2210 return ourSigFlags[sig]; 2211} 2212 2213void os::Solaris::set_our_sigflags(int sig, int flags) { 2214 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 2215 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 2216 ourSigFlags[sig] = flags; 2217} 2218 2219 2220static const char* get_signal_handler_name(address handler, 2221 char* buf, int buflen) { 2222 int offset; 2223 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 2224 if (found) { 2225 // skip directory names 2226 const char *p1, *p2; 2227 p1 = buf; 2228 size_t len = strlen(os::file_separator()); 2229 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 2230 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 2231 } else { 2232 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 2233 } 2234 return buf; 2235} 2236 2237static void print_signal_handler(outputStream* st, int sig, 2238 char* buf, size_t buflen) { 2239 struct sigaction sa; 2240 2241 sigaction(sig, NULL, &sa); 2242 2243 st->print("%s: ", os::exception_name(sig, buf, buflen)); 2244 2245 address handler = (sa.sa_flags & SA_SIGINFO) 2246 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 2247 : CAST_FROM_FN_PTR(address, sa.sa_handler); 2248 2249 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 2250 st->print("SIG_DFL"); 2251 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 2252 st->print("SIG_IGN"); 2253 } else { 2254 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 2255 } 2256 2257 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); 2258 2259 address rh = VMError::get_resetted_sighandler(sig); 2260 // May be, handler was resetted by VMError? 2261 if(rh != NULL) { 2262 handler = rh; 2263 sa.sa_flags = VMError::get_resetted_sigflags(sig); 2264 } 2265 2266 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); 2267 2268 // Check: is it our handler? 2269 if(handler == CAST_FROM_FN_PTR(address, signalHandler) || 2270 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) { 2271 // It is our signal handler 2272 // check for flags 2273 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 2274 st->print( 2275 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 2276 os::Solaris::get_our_sigflags(sig)); 2277 } 2278 } 2279 st->cr(); 2280} 2281 2282void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 2283 st->print_cr("Signal Handlers:"); 2284 print_signal_handler(st, SIGSEGV, buf, buflen); 2285 print_signal_handler(st, SIGBUS , buf, buflen); 2286 print_signal_handler(st, SIGFPE , buf, buflen); 2287 print_signal_handler(st, SIGPIPE, buf, buflen); 2288 print_signal_handler(st, SIGXFSZ, buf, buflen); 2289 print_signal_handler(st, SIGILL , buf, buflen); 2290 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); 2291 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 2292 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 2293 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 2294 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 2295 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 2296 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen); 2297 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen); 2298} 2299 2300static char saved_jvm_path[MAXPATHLEN] = { 0 }; 2301 2302// Find the full path to the current module, libjvm.so or libjvm_g.so 2303void os::jvm_path(char *buf, jint buflen) { 2304 // Error checking. 2305 if (buflen < MAXPATHLEN) { 2306 assert(false, "must use a large-enough buffer"); 2307 buf[0] = '\0'; 2308 return; 2309 } 2310 // Lazy resolve the path to current module. 2311 if (saved_jvm_path[0] != 0) { 2312 strcpy(buf, saved_jvm_path); 2313 return; 2314 } 2315 2316 Dl_info dlinfo; 2317 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 2318 assert(ret != 0, "cannot locate libjvm"); 2319 realpath((char *)dlinfo.dli_fname, buf); 2320 2321 if (strcmp(Arguments::sun_java_launcher(), "gamma") == 0) { 2322 // Support for the gamma launcher. Typical value for buf is 2323 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at 2324 // the right place in the string, then assume we are installed in a JDK and 2325 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix 2326 // up the path so it looks like libjvm.so is installed there (append a 2327 // fake suffix hotspot/libjvm.so). 2328 const char *p = buf + strlen(buf) - 1; 2329 for (int count = 0; p > buf && count < 5; ++count) { 2330 for (--p; p > buf && *p != '/'; --p) 2331 /* empty */ ; 2332 } 2333 2334 if (strncmp(p, "/jre/lib/", 9) != 0) { 2335 // Look for JAVA_HOME in the environment. 2336 char* java_home_var = ::getenv("JAVA_HOME"); 2337 if (java_home_var != NULL && java_home_var[0] != 0) { 2338 char cpu_arch[12]; 2339 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 2340#ifdef _LP64 2341 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9. 2342 if (strcmp(cpu_arch, "sparc") == 0) { 2343 strcat(cpu_arch, "v9"); 2344 } else if (strcmp(cpu_arch, "i386") == 0) { 2345 strcpy(cpu_arch, "amd64"); 2346 } 2347#endif 2348 // Check the current module name "libjvm.so" or "libjvm_g.so". 2349 p = strrchr(buf, '/'); 2350 assert(strstr(p, "/libjvm") == p, "invalid library name"); 2351 p = strstr(p, "_g") ? "_g" : ""; 2352 2353 realpath(java_home_var, buf); 2354 sprintf(buf + strlen(buf), "/jre/lib/%s", cpu_arch); 2355 if (0 == access(buf, F_OK)) { 2356 // Use current module name "libjvm[_g].so" instead of 2357 // "libjvm"debug_only("_g")".so" since for fastdebug version 2358 // we should have "libjvm.so" but debug_only("_g") adds "_g"! 2359 // It is used when we are choosing the HPI library's name 2360 // "libhpi[_g].so" in hpi::initialize_get_interface(). 2361 sprintf(buf + strlen(buf), "/hotspot/libjvm%s.so", p); 2362 } else { 2363 // Go back to path of .so 2364 realpath((char *)dlinfo.dli_fname, buf); 2365 } 2366 } 2367 } 2368 } 2369 2370 strcpy(saved_jvm_path, buf); 2371} 2372 2373 2374void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2375 // no prefix required, not even "_" 2376} 2377 2378 2379void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2380 // no suffix required 2381} 2382 2383 2384// sun.misc.Signal 2385 2386extern "C" { 2387 static void UserHandler(int sig, void *siginfo, void *context) { 2388 // Ctrl-C is pressed during error reporting, likely because the error 2389 // handler fails to abort. Let VM die immediately. 2390 if (sig == SIGINT && is_error_reported()) { 2391 os::die(); 2392 } 2393 2394 os::signal_notify(sig); 2395 // We do not need to reinstate the signal handler each time... 2396 } 2397} 2398 2399void* os::user_handler() { 2400 return CAST_FROM_FN_PTR(void*, UserHandler); 2401} 2402 2403extern "C" { 2404 typedef void (*sa_handler_t)(int); 2405 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2406} 2407 2408void* os::signal(int signal_number, void* handler) { 2409 struct sigaction sigAct, oldSigAct; 2410 sigfillset(&(sigAct.sa_mask)); 2411 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 2412 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2413 2414 if (sigaction(signal_number, &sigAct, &oldSigAct)) 2415 // -1 means registration failed 2416 return (void *)-1; 2417 2418 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2419} 2420 2421void os::signal_raise(int signal_number) { 2422 raise(signal_number); 2423} 2424 2425/* 2426 * The following code is moved from os.cpp for making this 2427 * code platform specific, which it is by its very nature. 2428 */ 2429 2430// a counter for each possible signal value 2431static int Sigexit = 0; 2432static int Maxlibjsigsigs; 2433static jint *pending_signals = NULL; 2434static int *preinstalled_sigs = NULL; 2435static struct sigaction *chainedsigactions = NULL; 2436static sema_t sig_sem; 2437typedef int (*version_getting_t)(); 2438version_getting_t os::Solaris::get_libjsig_version = NULL; 2439static int libjsigversion = NULL; 2440 2441int os::sigexitnum_pd() { 2442 assert(Sigexit > 0, "signal memory not yet initialized"); 2443 return Sigexit; 2444} 2445 2446void os::Solaris::init_signal_mem() { 2447 // Initialize signal structures 2448 Maxsignum = SIGRTMAX; 2449 Sigexit = Maxsignum+1; 2450 assert(Maxsignum >0, "Unable to obtain max signal number"); 2451 2452 Maxlibjsigsigs = Maxsignum; 2453 2454 // pending_signals has one int per signal 2455 // The additional signal is for SIGEXIT - exit signal to signal_thread 2456 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1)); 2457 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 2458 2459 if (UseSignalChaining) { 2460 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 2461 * (Maxsignum + 1)); 2462 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 2463 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1)); 2464 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 2465 } 2466 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 )); 2467 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 2468} 2469 2470void os::signal_init_pd() { 2471 int ret; 2472 2473 ret = ::sema_init(&sig_sem, 0, NULL, NULL); 2474 assert(ret == 0, "sema_init() failed"); 2475} 2476 2477void os::signal_notify(int signal_number) { 2478 int ret; 2479 2480 Atomic::inc(&pending_signals[signal_number]); 2481 ret = ::sema_post(&sig_sem); 2482 assert(ret == 0, "sema_post() failed"); 2483} 2484 2485static int check_pending_signals(bool wait_for_signal) { 2486 int ret; 2487 while (true) { 2488 for (int i = 0; i < Sigexit + 1; i++) { 2489 jint n = pending_signals[i]; 2490 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2491 return i; 2492 } 2493 } 2494 if (!wait_for_signal) { 2495 return -1; 2496 } 2497 JavaThread *thread = JavaThread::current(); 2498 ThreadBlockInVM tbivm(thread); 2499 2500 bool threadIsSuspended; 2501 do { 2502 thread->set_suspend_equivalent(); 2503 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2504 while((ret = ::sema_wait(&sig_sem)) == EINTR) 2505 ; 2506 assert(ret == 0, "sema_wait() failed"); 2507 2508 // were we externally suspended while we were waiting? 2509 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2510 if (threadIsSuspended) { 2511 // 2512 // The semaphore has been incremented, but while we were waiting 2513 // another thread suspended us. We don't want to continue running 2514 // while suspended because that would surprise the thread that 2515 // suspended us. 2516 // 2517 ret = ::sema_post(&sig_sem); 2518 assert(ret == 0, "sema_post() failed"); 2519 2520 thread->java_suspend_self(); 2521 } 2522 } while (threadIsSuspended); 2523 } 2524} 2525 2526int os::signal_lookup() { 2527 return check_pending_signals(false); 2528} 2529 2530int os::signal_wait() { 2531 return check_pending_signals(true); 2532} 2533 2534//////////////////////////////////////////////////////////////////////////////// 2535// Virtual Memory 2536 2537static int page_size = -1; 2538 2539// The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will 2540// clear this var if support is not available. 2541static bool has_map_align = true; 2542 2543int os::vm_page_size() { 2544 assert(page_size != -1, "must call os::init"); 2545 return page_size; 2546} 2547 2548// Solaris allocates memory by pages. 2549int os::vm_allocation_granularity() { 2550 assert(page_size != -1, "must call os::init"); 2551 return page_size; 2552} 2553 2554bool os::commit_memory(char* addr, size_t bytes) { 2555 size_t size = bytes; 2556 return 2557 NULL != Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, 2558 PROT_READ | PROT_WRITE | PROT_EXEC); 2559} 2560 2561bool os::commit_memory(char* addr, size_t bytes, size_t alignment_hint) { 2562 if (commit_memory(addr, bytes)) { 2563 if (UseMPSS && alignment_hint > (size_t)vm_page_size()) { 2564 // If the large page size has been set and the VM 2565 // is using large pages, use the large page size 2566 // if it is smaller than the alignment hint. This is 2567 // a case where the VM wants to use a larger alignment size 2568 // for its own reasons but still want to use large pages 2569 // (which is what matters to setting the mpss range. 2570 size_t page_size = 0; 2571 if (large_page_size() < alignment_hint) { 2572 assert(UseLargePages, "Expected to be here for large page use only"); 2573 page_size = large_page_size(); 2574 } else { 2575 // If the alignment hint is less than the large page 2576 // size, the VM wants a particular alignment (thus the hint) 2577 // for internal reasons. Try to set the mpss range using 2578 // the alignment_hint. 2579 page_size = alignment_hint; 2580 } 2581 // Since this is a hint, ignore any failures. 2582 (void)Solaris::set_mpss_range(addr, bytes, page_size); 2583 } 2584 return true; 2585 } 2586 return false; 2587} 2588 2589// Uncommit the pages in a specified region. 2590void os::free_memory(char* addr, size_t bytes) { 2591 if (madvise(addr, bytes, MADV_FREE) < 0) { 2592 debug_only(warning("MADV_FREE failed.")); 2593 return; 2594 } 2595} 2596 2597// Change the page size in a given range. 2598void os::realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2599 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2600 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2601 Solaris::set_mpss_range(addr, bytes, alignment_hint); 2602} 2603 2604// Tell the OS to make the range local to the first-touching LWP 2605void os::numa_make_local(char *addr, size_t bytes) { 2606 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2607 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2608 debug_only(warning("MADV_ACCESS_LWP failed.")); 2609 } 2610} 2611 2612// Tell the OS that this range would be accessed from different LWPs. 2613void os::numa_make_global(char *addr, size_t bytes) { 2614 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2615 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2616 debug_only(warning("MADV_ACCESS_MANY failed.")); 2617 } 2618} 2619 2620// Get the number of the locality groups. 2621size_t os::numa_get_groups_num() { 2622 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2623 return n != -1 ? n : 1; 2624} 2625 2626// Get a list of leaf locality groups. A leaf lgroup is group that 2627// doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2628// board. An LWP is assigned to one of these groups upon creation. 2629size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2630 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2631 ids[0] = 0; 2632 return 1; 2633 } 2634 int result_size = 0, top = 1, bottom = 0, cur = 0; 2635 for (int k = 0; k < size; k++) { 2636 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2637 (Solaris::lgrp_id_t*)&ids[top], size - top); 2638 if (r == -1) { 2639 ids[0] = 0; 2640 return 1; 2641 } 2642 if (!r) { 2643 assert (bottom <= cur, "Sanity check"); 2644 ids[bottom++] = ids[cur]; 2645 } 2646 top += r; 2647 cur++; 2648 } 2649 return bottom; 2650} 2651 2652// Detect the topology change. Typically happens during CPU pluggin-unplugging. 2653bool os::numa_topology_changed() { 2654 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2655 if (is_stale != -1 && is_stale) { 2656 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2657 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2658 assert(c != 0, "Failure to initialize LGRP API"); 2659 Solaris::set_lgrp_cookie(c); 2660 return true; 2661 } 2662 return false; 2663} 2664 2665// Get the group id of the current LWP. 2666int os::numa_get_group_id() { 2667 int lgrp_id = os::Solaris::lgrp_home(P_LWPID, P_MYID); 2668 if (lgrp_id == -1) { 2669 return 0; 2670 } 2671 return lgrp_id; 2672} 2673 2674// Request information about the page. 2675bool os::get_page_info(char *start, page_info* info) { 2676 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2677 uint64_t addr = (uintptr_t)start; 2678 uint64_t outdata[2]; 2679 uint_t validity = 0; 2680 2681 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2682 return false; 2683 } 2684 2685 info->size = 0; 2686 info->lgrp_id = -1; 2687 2688 if ((validity & 1) != 0) { 2689 if ((validity & 2) != 0) { 2690 info->lgrp_id = outdata[0]; 2691 } 2692 if ((validity & 4) != 0) { 2693 info->size = outdata[1]; 2694 } 2695 return true; 2696 } 2697 return false; 2698} 2699 2700// Scan the pages from start to end until a page different than 2701// the one described in the info parameter is encountered. 2702char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 2703 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2704 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 2705 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT]; 2706 uint_t validity[MAX_MEMINFO_CNT]; 2707 2708 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 2709 uint64_t p = (uint64_t)start; 2710 while (p < (uint64_t)end) { 2711 addrs[0] = p; 2712 size_t addrs_count = 1; 2713 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] < (uint64_t)end) { 2714 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 2715 addrs_count++; 2716 } 2717 2718 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 2719 return NULL; 2720 } 2721 2722 size_t i = 0; 2723 for (; i < addrs_count; i++) { 2724 if ((validity[i] & 1) != 0) { 2725 if ((validity[i] & 4) != 0) { 2726 if (outdata[types * i + 1] != page_expected->size) { 2727 break; 2728 } 2729 } else 2730 if (page_expected->size != 0) { 2731 break; 2732 } 2733 2734 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 2735 if (outdata[types * i] != page_expected->lgrp_id) { 2736 break; 2737 } 2738 } 2739 } else { 2740 return NULL; 2741 } 2742 } 2743 2744 if (i != addrs_count) { 2745 if ((validity[i] & 2) != 0) { 2746 page_found->lgrp_id = outdata[types * i]; 2747 } else { 2748 page_found->lgrp_id = -1; 2749 } 2750 if ((validity[i] & 4) != 0) { 2751 page_found->size = outdata[types * i + 1]; 2752 } else { 2753 page_found->size = 0; 2754 } 2755 return (char*)addrs[i]; 2756 } 2757 2758 p = addrs[addrs_count - 1] + page_size; 2759 } 2760 return end; 2761} 2762 2763bool os::uncommit_memory(char* addr, size_t bytes) { 2764 size_t size = bytes; 2765 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2766 // uncommitted page. Otherwise, the read/write might succeed if we 2767 // have enough swap space to back the physical page. 2768 return 2769 NULL != Solaris::mmap_chunk(addr, size, 2770 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 2771 PROT_NONE); 2772} 2773 2774char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 2775 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 2776 2777 if (b == MAP_FAILED) { 2778 return NULL; 2779 } 2780 return b; 2781} 2782 2783char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) { 2784 char* addr = requested_addr; 2785 int flags = MAP_PRIVATE | MAP_NORESERVE; 2786 2787 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap"); 2788 2789 if (fixed) { 2790 flags |= MAP_FIXED; 2791 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) { 2792 flags |= MAP_ALIGN; 2793 addr = (char*) alignment_hint; 2794 } 2795 2796 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2797 // uncommitted page. Otherwise, the read/write might succeed if we 2798 // have enough swap space to back the physical page. 2799 return mmap_chunk(addr, bytes, flags, PROT_NONE); 2800} 2801 2802char* os::reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) { 2803 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL)); 2804 2805 guarantee(requested_addr == NULL || requested_addr == addr, 2806 "OS failed to return requested mmap address."); 2807 return addr; 2808} 2809 2810// Reserve memory at an arbitrary address, only if that area is 2811// available (and not reserved for something else). 2812 2813char* os::attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2814 const int max_tries = 10; 2815 char* base[max_tries]; 2816 size_t size[max_tries]; 2817 2818 // Solaris adds a gap between mmap'ed regions. The size of the gap 2819 // is dependent on the requested size and the MMU. Our initial gap 2820 // value here is just a guess and will be corrected later. 2821 bool had_top_overlap = false; 2822 bool have_adjusted_gap = false; 2823 size_t gap = 0x400000; 2824 2825 // Assert only that the size is a multiple of the page size, since 2826 // that's all that mmap requires, and since that's all we really know 2827 // about at this low abstraction level. If we need higher alignment, 2828 // we can either pass an alignment to this method or verify alignment 2829 // in one of the methods further up the call chain. See bug 5044738. 2830 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2831 2832 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 2833 // Give it a try, if the kernel honors the hint we can return immediately. 2834 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 2835 volatile int err = errno; 2836 if (addr == requested_addr) { 2837 return addr; 2838 } else if (addr != NULL) { 2839 unmap_memory(addr, bytes); 2840 } 2841 2842 if (PrintMiscellaneous && Verbose) { 2843 char buf[256]; 2844 buf[0] = '\0'; 2845 if (addr == NULL) { 2846 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err)); 2847 } 2848 warning("attempt_reserve_memory_at: couldn't reserve %d bytes at " 2849 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT 2850 "%s", bytes, requested_addr, addr, buf); 2851 } 2852 2853 // Address hint method didn't work. Fall back to the old method. 2854 // In theory, once SNV becomes our oldest supported platform, this 2855 // code will no longer be needed. 2856 // 2857 // Repeatedly allocate blocks until the block is allocated at the 2858 // right spot. Give up after max_tries. 2859 int i; 2860 for (i = 0; i < max_tries; ++i) { 2861 base[i] = reserve_memory(bytes); 2862 2863 if (base[i] != NULL) { 2864 // Is this the block we wanted? 2865 if (base[i] == requested_addr) { 2866 size[i] = bytes; 2867 break; 2868 } 2869 2870 // check that the gap value is right 2871 if (had_top_overlap && !have_adjusted_gap) { 2872 size_t actual_gap = base[i-1] - base[i] - bytes; 2873 if (gap != actual_gap) { 2874 // adjust the gap value and retry the last 2 allocations 2875 assert(i > 0, "gap adjustment code problem"); 2876 have_adjusted_gap = true; // adjust the gap only once, just in case 2877 gap = actual_gap; 2878 if (PrintMiscellaneous && Verbose) { 2879 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap); 2880 } 2881 unmap_memory(base[i], bytes); 2882 unmap_memory(base[i-1], size[i-1]); 2883 i-=2; 2884 continue; 2885 } 2886 } 2887 2888 // Does this overlap the block we wanted? Give back the overlapped 2889 // parts and try again. 2890 // 2891 // There is still a bug in this code: if top_overlap == bytes, 2892 // the overlap is offset from requested region by the value of gap. 2893 // In this case giving back the overlapped part will not work, 2894 // because we'll give back the entire block at base[i] and 2895 // therefore the subsequent allocation will not generate a new gap. 2896 // This could be fixed with a new algorithm that used larger 2897 // or variable size chunks to find the requested region - 2898 // but such a change would introduce additional complications. 2899 // It's rare enough that the planets align for this bug, 2900 // so we'll just wait for a fix for 6204603/5003415 which 2901 // will provide a mmap flag to allow us to avoid this business. 2902 2903 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2904 if (top_overlap >= 0 && top_overlap < bytes) { 2905 had_top_overlap = true; 2906 unmap_memory(base[i], top_overlap); 2907 base[i] += top_overlap; 2908 size[i] = bytes - top_overlap; 2909 } else { 2910 size_t bottom_overlap = base[i] + bytes - requested_addr; 2911 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2912 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) { 2913 warning("attempt_reserve_memory_at: possible alignment bug"); 2914 } 2915 unmap_memory(requested_addr, bottom_overlap); 2916 size[i] = bytes - bottom_overlap; 2917 } else { 2918 size[i] = bytes; 2919 } 2920 } 2921 } 2922 } 2923 2924 // Give back the unused reserved pieces. 2925 2926 for (int j = 0; j < i; ++j) { 2927 if (base[j] != NULL) { 2928 unmap_memory(base[j], size[j]); 2929 } 2930 } 2931 2932 return (i < max_tries) ? requested_addr : NULL; 2933} 2934 2935bool os::release_memory(char* addr, size_t bytes) { 2936 size_t size = bytes; 2937 return munmap(addr, size) == 0; 2938} 2939 2940static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 2941 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()), 2942 "addr must be page aligned"); 2943 int retVal = mprotect(addr, bytes, prot); 2944 return retVal == 0; 2945} 2946 2947// Protect memory (make it read-only. (Used to pass readonly pages through 2948// JNI GetArray<type>Elements with empty arrays.) 2949bool os::protect_memory(char* addr, size_t bytes) { 2950 return solaris_mprotect(addr, bytes, PROT_READ); 2951} 2952 2953// guard_memory and unguard_memory only happens within stack guard pages. 2954// Since ISM pertains only to the heap, guard and unguard memory should not 2955/// happen with an ISM region. 2956bool os::guard_memory(char* addr, size_t bytes) { 2957 return solaris_mprotect(addr, bytes, PROT_NONE); 2958} 2959 2960bool os::unguard_memory(char* addr, size_t bytes) { 2961 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE|PROT_EXEC); 2962} 2963 2964// Large page support 2965 2966// UseLargePages is the master flag to enable/disable large page memory. 2967// UseMPSS and UseISM are supported for compatibility reasons. Their combined 2968// effects can be described in the following table: 2969// 2970// UseLargePages UseMPSS UseISM 2971// false * * => UseLargePages is the master switch, turning 2972// it off will turn off both UseMPSS and 2973// UseISM. VM will not use large page memory 2974// regardless the settings of UseMPSS/UseISM. 2975// true false false => Unless future Solaris provides other 2976// mechanism to use large page memory, this 2977// combination is equivalent to -UseLargePages, 2978// VM will not use large page memory 2979// true true false => JVM will use MPSS for large page memory. 2980// This is the default behavior. 2981// true false true => JVM will use ISM for large page memory. 2982// true true true => JVM will use ISM if it is available. 2983// Otherwise, JVM will fall back to MPSS. 2984// Becaues ISM is now available on all 2985// supported Solaris versions, this combination 2986// is equivalent to +UseISM -UseMPSS. 2987 2988typedef int (*getpagesizes_func_type) (size_t[], int); 2989static size_t _large_page_size = 0; 2990 2991bool os::Solaris::ism_sanity_check(bool warn, size_t * page_size) { 2992 // x86 uses either 2M or 4M page, depending on whether PAE (Physical Address 2993 // Extensions) mode is enabled. AMD64/EM64T uses 2M page in 64bit mode. Sparc 2994 // can support multiple page sizes. 2995 2996 // Don't bother to probe page size because getpagesizes() comes with MPSS. 2997 // ISM is only recommended on old Solaris where there is no MPSS support. 2998 // Simply choose a conservative value as default. 2999 *page_size = LargePageSizeInBytes ? LargePageSizeInBytes : 3000 SPARC_ONLY(4 * M) IA32_ONLY(4 * M) AMD64_ONLY(2 * M); 3001 3002 // ISM is available on all supported Solaris versions 3003 return true; 3004} 3005 3006// Insertion sort for small arrays (descending order). 3007static void insertion_sort_descending(size_t* array, int len) { 3008 for (int i = 0; i < len; i++) { 3009 size_t val = array[i]; 3010 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 3011 size_t tmp = array[key]; 3012 array[key] = array[key - 1]; 3013 array[key - 1] = tmp; 3014 } 3015 } 3016} 3017 3018bool os::Solaris::mpss_sanity_check(bool warn, size_t * page_size) { 3019 getpagesizes_func_type getpagesizes_func = 3020 CAST_TO_FN_PTR(getpagesizes_func_type, dlsym(RTLD_DEFAULT, "getpagesizes")); 3021 if (getpagesizes_func == NULL) { 3022 if (warn) { 3023 warning("MPSS is not supported by the operating system."); 3024 } 3025 return false; 3026 } 3027 3028 const unsigned int usable_count = VM_Version::page_size_count(); 3029 if (usable_count == 1) { 3030 return false; 3031 } 3032 3033 // Fill the array of page sizes. 3034 int n = getpagesizes_func(_page_sizes, page_sizes_max); 3035 assert(n > 0, "Solaris bug?"); 3036 if (n == page_sizes_max) { 3037 // Add a sentinel value (necessary only if the array was completely filled 3038 // since it is static (zeroed at initialization)). 3039 _page_sizes[--n] = 0; 3040 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 3041 } 3042 assert(_page_sizes[n] == 0, "missing sentinel"); 3043 3044 if (n == 1) return false; // Only one page size available. 3045 3046 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 3047 // select up to usable_count elements. First sort the array, find the first 3048 // acceptable value, then copy the usable sizes to the top of the array and 3049 // trim the rest. Make sure to include the default page size :-). 3050 // 3051 // A better policy could get rid of the 4M limit by taking the sizes of the 3052 // important VM memory regions (java heap and possibly the code cache) into 3053 // account. 3054 insertion_sort_descending(_page_sizes, n); 3055 const size_t size_limit = 3056 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 3057 int beg; 3058 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ; 3059 const int end = MIN2((int)usable_count, n) - 1; 3060 for (int cur = 0; cur < end; ++cur, ++beg) { 3061 _page_sizes[cur] = _page_sizes[beg]; 3062 } 3063 _page_sizes[end] = vm_page_size(); 3064 _page_sizes[end + 1] = 0; 3065 3066 if (_page_sizes[end] > _page_sizes[end - 1]) { 3067 // Default page size is not the smallest; sort again. 3068 insertion_sort_descending(_page_sizes, end + 1); 3069 } 3070 *page_size = _page_sizes[0]; 3071 3072 return true; 3073} 3074 3075bool os::large_page_init() { 3076 if (!UseLargePages) { 3077 UseISM = false; 3078 UseMPSS = false; 3079 return false; 3080 } 3081 3082 // print a warning if any large page related flag is specified on command line 3083 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 3084 !FLAG_IS_DEFAULT(UseISM) || 3085 !FLAG_IS_DEFAULT(UseMPSS) || 3086 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 3087 UseISM = UseISM && 3088 Solaris::ism_sanity_check(warn_on_failure, &_large_page_size); 3089 if (UseISM) { 3090 // ISM disables MPSS to be compatible with old JDK behavior 3091 UseMPSS = false; 3092 _page_sizes[0] = _large_page_size; 3093 _page_sizes[1] = vm_page_size(); 3094 } 3095 3096 UseMPSS = UseMPSS && 3097 Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 3098 3099 UseLargePages = UseISM || UseMPSS; 3100 return UseLargePages; 3101} 3102 3103bool os::Solaris::set_mpss_range(caddr_t start, size_t bytes, size_t align) { 3104 // Signal to OS that we want large pages for addresses 3105 // from addr, addr + bytes 3106 struct memcntl_mha mpss_struct; 3107 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 3108 mpss_struct.mha_pagesize = align; 3109 mpss_struct.mha_flags = 0; 3110 if (memcntl(start, bytes, MC_HAT_ADVISE, 3111 (caddr_t) &mpss_struct, 0, 0) < 0) { 3112 debug_only(warning("Attempt to use MPSS failed.")); 3113 return false; 3114 } 3115 return true; 3116} 3117 3118char* os::reserve_memory_special(size_t bytes) { 3119 assert(UseLargePages && UseISM, "only for ISM large pages"); 3120 3121 size_t size = bytes; 3122 char* retAddr = NULL; 3123 int shmid; 3124 key_t ismKey; 3125 3126 bool warn_on_failure = UseISM && 3127 (!FLAG_IS_DEFAULT(UseLargePages) || 3128 !FLAG_IS_DEFAULT(UseISM) || 3129 !FLAG_IS_DEFAULT(LargePageSizeInBytes) 3130 ); 3131 char msg[128]; 3132 3133 ismKey = IPC_PRIVATE; 3134 3135 // Create a large shared memory region to attach to based on size. 3136 // Currently, size is the total size of the heap 3137 shmid = shmget(ismKey, size, SHM_R | SHM_W | IPC_CREAT); 3138 if (shmid == -1){ 3139 if (warn_on_failure) { 3140 jio_snprintf(msg, sizeof(msg), "Failed to reserve shared memory (errno = %d).", errno); 3141 warning(msg); 3142 } 3143 return NULL; 3144 } 3145 3146 // Attach to the region 3147 retAddr = (char *) shmat(shmid, 0, SHM_SHARE_MMU | SHM_R | SHM_W); 3148 int err = errno; 3149 3150 // Remove shmid. If shmat() is successful, the actual shared memory segment 3151 // will be deleted when it's detached by shmdt() or when the process 3152 // terminates. If shmat() is not successful this will remove the shared 3153 // segment immediately. 3154 shmctl(shmid, IPC_RMID, NULL); 3155 3156 if (retAddr == (char *) -1) { 3157 if (warn_on_failure) { 3158 jio_snprintf(msg, sizeof(msg), "Failed to attach shared memory (errno = %d).", err); 3159 warning(msg); 3160 } 3161 return NULL; 3162 } 3163 3164 return retAddr; 3165} 3166 3167bool os::release_memory_special(char* base, size_t bytes) { 3168 // detaching the SHM segment will also delete it, see reserve_memory_special() 3169 int rslt = shmdt(base); 3170 return rslt == 0; 3171} 3172 3173size_t os::large_page_size() { 3174 return _large_page_size; 3175} 3176 3177// MPSS allows application to commit large page memory on demand; with ISM 3178// the entire memory region must be allocated as shared memory. 3179bool os::can_commit_large_page_memory() { 3180 return UseISM ? false : true; 3181} 3182 3183bool os::can_execute_large_page_memory() { 3184 return UseISM ? false : true; 3185} 3186 3187static int os_sleep(jlong millis, bool interruptible) { 3188 const jlong limit = INT_MAX; 3189 jlong prevtime; 3190 int res; 3191 3192 while (millis > limit) { 3193 if ((res = os_sleep(limit, interruptible)) != OS_OK) 3194 return res; 3195 millis -= limit; 3196 } 3197 3198 // Restart interrupted polls with new parameters until the proper delay 3199 // has been completed. 3200 3201 prevtime = getTimeMillis(); 3202 3203 while (millis > 0) { 3204 jlong newtime; 3205 3206 if (!interruptible) { 3207 // Following assert fails for os::yield_all: 3208 // assert(!thread->is_Java_thread(), "must not be java thread"); 3209 res = poll(NULL, 0, millis); 3210 } else { 3211 JavaThread *jt = JavaThread::current(); 3212 3213 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt, 3214 os::Solaris::clear_interrupted); 3215 } 3216 3217 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for 3218 // thread.Interrupt. 3219 3220 if((res == OS_ERR) && (errno == EINTR)) { 3221 newtime = getTimeMillis(); 3222 assert(newtime >= prevtime, "time moving backwards"); 3223 /* Doing prevtime and newtime in microseconds doesn't help precision, 3224 and trying to round up to avoid lost milliseconds can result in a 3225 too-short delay. */ 3226 millis -= newtime - prevtime; 3227 if(millis <= 0) 3228 return OS_OK; 3229 prevtime = newtime; 3230 } else 3231 return res; 3232 } 3233 3234 return OS_OK; 3235} 3236 3237// Read calls from inside the vm need to perform state transitions 3238size_t os::read(int fd, void *buf, unsigned int nBytes) { 3239 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted); 3240} 3241 3242int os::sleep(Thread* thread, jlong millis, bool interruptible) { 3243 assert(thread == Thread::current(), "thread consistency check"); 3244 3245 // TODO-FIXME: this should be removed. 3246 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock 3247 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate 3248 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving 3249 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel 3250 // is fooled into believing that the system is making progress. In the code below we block the 3251 // the watcher thread while safepoint is in progress so that it would not appear as though the 3252 // system is making progress. 3253 if (!Solaris::T2_libthread() && 3254 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) { 3255 // We now try to acquire the threads lock. Since this lock is held by the VM thread during 3256 // the entire safepoint, the watcher thread will line up here during the safepoint. 3257 Threads_lock->lock_without_safepoint_check(); 3258 Threads_lock->unlock(); 3259 } 3260 3261 if (thread->is_Java_thread()) { 3262 // This is a JavaThread so we honor the _thread_blocked protocol 3263 // even for sleeps of 0 milliseconds. This was originally done 3264 // as a workaround for bug 4338139. However, now we also do it 3265 // to honor the suspend-equivalent protocol. 3266 3267 JavaThread *jt = (JavaThread *) thread; 3268 ThreadBlockInVM tbivm(jt); 3269 3270 jt->set_suspend_equivalent(); 3271 // cleared by handle_special_suspend_equivalent_condition() or 3272 // java_suspend_self() via check_and_wait_while_suspended() 3273 3274 int ret_code; 3275 if (millis <= 0) { 3276 thr_yield(); 3277 ret_code = 0; 3278 } else { 3279 // The original sleep() implementation did not create an 3280 // OSThreadWaitState helper for sleeps of 0 milliseconds. 3281 // I'm preserving that decision for now. 3282 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); 3283 3284 ret_code = os_sleep(millis, interruptible); 3285 } 3286 3287 // were we externally suspended while we were waiting? 3288 jt->check_and_wait_while_suspended(); 3289 3290 return ret_code; 3291 } 3292 3293 // non-JavaThread from this point on: 3294 3295 if (millis <= 0) { 3296 thr_yield(); 3297 return 0; 3298 } 3299 3300 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 3301 3302 return os_sleep(millis, interruptible); 3303} 3304 3305int os::naked_sleep() { 3306 // %% make the sleep time an integer flag. for now use 1 millisec. 3307 return os_sleep(1, false); 3308} 3309 3310// Sleep forever; naked call to OS-specific sleep; use with CAUTION 3311void os::infinite_sleep() { 3312 while (true) { // sleep forever ... 3313 ::sleep(100); // ... 100 seconds at a time 3314 } 3315} 3316 3317// Used to convert frequent JVM_Yield() to nops 3318bool os::dont_yield() { 3319 if (DontYieldALot) { 3320 static hrtime_t last_time = 0; 3321 hrtime_t diff = getTimeNanos() - last_time; 3322 3323 if (diff < DontYieldALotInterval * 1000000) 3324 return true; 3325 3326 last_time += diff; 3327 3328 return false; 3329 } 3330 else { 3331 return false; 3332 } 3333} 3334 3335// Caveat: Solaris os::yield() causes a thread-state transition whereas 3336// the linux and win32 implementations do not. This should be checked. 3337 3338void os::yield() { 3339 // Yields to all threads with same or greater priority 3340 os::sleep(Thread::current(), 0, false); 3341} 3342 3343// Note that yield semantics are defined by the scheduling class to which 3344// the thread currently belongs. Typically, yield will _not yield to 3345// other equal or higher priority threads that reside on the dispatch queues 3346// of other CPUs. 3347 3348os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; } 3349 3350 3351// On Solaris we found that yield_all doesn't always yield to all other threads. 3352// There have been cases where there is a thread ready to execute but it doesn't 3353// get an lwp as the VM thread continues to spin with sleeps of 1 millisecond. 3354// The 1 millisecond wait doesn't seem long enough for the kernel to issue a 3355// SIGWAITING signal which will cause a new lwp to be created. So we count the 3356// number of times yield_all is called in the one loop and increase the sleep 3357// time after 8 attempts. If this fails too we increase the concurrency level 3358// so that the starving thread would get an lwp 3359 3360void os::yield_all(int attempts) { 3361 // Yields to all threads, including threads with lower priorities 3362 if (attempts == 0) { 3363 os::sleep(Thread::current(), 1, false); 3364 } else { 3365 int iterations = attempts % 30; 3366 if (iterations == 0 && !os::Solaris::T2_libthread()) { 3367 // thr_setconcurrency and _getconcurrency make sense only under T1. 3368 int noofLWPS = thr_getconcurrency(); 3369 if (noofLWPS < (Threads::number_of_threads() + 2)) { 3370 thr_setconcurrency(thr_getconcurrency() + 1); 3371 } 3372 } else if (iterations < 25) { 3373 os::sleep(Thread::current(), 1, false); 3374 } else { 3375 os::sleep(Thread::current(), 10, false); 3376 } 3377 } 3378} 3379 3380// Called from the tight loops to possibly influence time-sharing heuristics 3381void os::loop_breaker(int attempts) { 3382 os::yield_all(attempts); 3383} 3384 3385 3386// Interface for setting lwp priorities. If we are using T2 libthread, 3387// which forces the use of BoundThreads or we manually set UseBoundThreads, 3388// all of our threads will be assigned to real lwp's. Using the thr_setprio 3389// function is meaningless in this mode so we must adjust the real lwp's priority 3390// The routines below implement the getting and setting of lwp priorities. 3391// 3392// Note: There are three priority scales used on Solaris. Java priotities 3393// which range from 1 to 10, libthread "thr_setprio" scale which range 3394// from 0 to 127, and the current scheduling class of the process we 3395// are running in. This is typically from -60 to +60. 3396// The setting of the lwp priorities in done after a call to thr_setprio 3397// so Java priorities are mapped to libthread priorities and we map from 3398// the latter to lwp priorities. We don't keep priorities stored in 3399// Java priorities since some of our worker threads want to set priorities 3400// higher than all Java threads. 3401// 3402// For related information: 3403// (1) man -s 2 priocntl 3404// (2) man -s 4 priocntl 3405// (3) man dispadmin 3406// = librt.so 3407// = libthread/common/rtsched.c - thrp_setlwpprio(). 3408// = ps -cL <pid> ... to validate priority. 3409// = sched_get_priority_min and _max 3410// pthread_create 3411// sched_setparam 3412// pthread_setschedparam 3413// 3414// Assumptions: 3415// + We assume that all threads in the process belong to the same 3416// scheduling class. IE. an homogenous process. 3417// + Must be root or in IA group to change change "interactive" attribute. 3418// Priocntl() will fail silently. The only indication of failure is when 3419// we read-back the value and notice that it hasn't changed. 3420// + Interactive threads enter the runq at the head, non-interactive at the tail. 3421// + For RT, change timeslice as well. Invariant: 3422// constant "priority integral" 3423// Konst == TimeSlice * (60-Priority) 3424// Given a priority, compute appropriate timeslice. 3425// + Higher numerical values have higher priority. 3426 3427// sched class attributes 3428typedef struct { 3429 int schedPolicy; // classID 3430 int maxPrio; 3431 int minPrio; 3432} SchedInfo; 3433 3434 3435static SchedInfo tsLimits, iaLimits, rtLimits; 3436 3437#ifdef ASSERT 3438static int ReadBackValidate = 1; 3439#endif 3440static int myClass = 0; 3441static int myMin = 0; 3442static int myMax = 0; 3443static int myCur = 0; 3444static bool priocntl_enable = false; 3445 3446 3447// Call the version of priocntl suitable for all supported versions 3448// of Solaris. We need to call through this wrapper so that we can 3449// build on Solaris 9 and run on Solaris 8, 9 and 10. 3450// 3451// This code should be removed if we ever stop supporting Solaris 8 3452// and earlier releases. 3453 3454static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg); 3455typedef long (*priocntl_type)(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg); 3456static priocntl_type priocntl_ptr = priocntl_stub; 3457 3458// Stub to set the value of the real pointer, and then call the real 3459// function. 3460 3461static long priocntl_stub(int pcver, idtype_t idtype, id_t id, int cmd, caddr_t arg) { 3462 // Try Solaris 8- name only. 3463 priocntl_type tmp = (priocntl_type)dlsym(RTLD_DEFAULT, "__priocntl"); 3464 guarantee(tmp != NULL, "priocntl function not found."); 3465 priocntl_ptr = tmp; 3466 return (*priocntl_ptr)(PC_VERSION, idtype, id, cmd, arg); 3467} 3468 3469 3470// lwp_priocntl_init 3471// 3472// Try to determine the priority scale for our process. 3473// 3474// Return errno or 0 if OK. 3475// 3476static 3477int lwp_priocntl_init () 3478{ 3479 int rslt; 3480 pcinfo_t ClassInfo; 3481 pcparms_t ParmInfo; 3482 int i; 3483 3484 if (!UseThreadPriorities) return 0; 3485 3486 // We are using Bound threads, we need to determine our priority ranges 3487 if (os::Solaris::T2_libthread() || UseBoundThreads) { 3488 // If ThreadPriorityPolicy is 1, switch tables 3489 if (ThreadPriorityPolicy == 1) { 3490 for (i = 0 ; i < MaxPriority+1; i++) 3491 os::java_to_os_priority[i] = prio_policy1[i]; 3492 } 3493 } 3494 // Not using Bound Threads, set to ThreadPolicy 1 3495 else { 3496 for ( i = 0 ; i < MaxPriority+1; i++ ) { 3497 os::java_to_os_priority[i] = prio_policy1[i]; 3498 } 3499 return 0; 3500 } 3501 3502 3503 // Get IDs for a set of well-known scheduling classes. 3504 // TODO-FIXME: GETCLINFO returns the current # of classes in the 3505 // the system. We should have a loop that iterates over the 3506 // classID values, which are known to be "small" integers. 3507 3508 strcpy(ClassInfo.pc_clname, "TS"); 3509 ClassInfo.pc_cid = -1; 3510 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3511 if (rslt < 0) return errno; 3512 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 3513 tsLimits.schedPolicy = ClassInfo.pc_cid; 3514 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 3515 tsLimits.minPrio = -tsLimits.maxPrio; 3516 3517 strcpy(ClassInfo.pc_clname, "IA"); 3518 ClassInfo.pc_cid = -1; 3519 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3520 if (rslt < 0) return errno; 3521 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 3522 iaLimits.schedPolicy = ClassInfo.pc_cid; 3523 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 3524 iaLimits.minPrio = -iaLimits.maxPrio; 3525 3526 strcpy(ClassInfo.pc_clname, "RT"); 3527 ClassInfo.pc_cid = -1; 3528 rslt = (*priocntl_ptr)(PC_VERSION, P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3529 if (rslt < 0) return errno; 3530 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 3531 rtLimits.schedPolicy = ClassInfo.pc_cid; 3532 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 3533 rtLimits.minPrio = 0; 3534 3535 3536 // Query our "current" scheduling class. 3537 // This will normally be IA,TS or, rarely, RT. 3538 memset (&ParmInfo, 0, sizeof(ParmInfo)); 3539 ParmInfo.pc_cid = PC_CLNULL; 3540 rslt = (*priocntl_ptr) (PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo ); 3541 if ( rslt < 0 ) return errno; 3542 myClass = ParmInfo.pc_cid; 3543 3544 // We now know our scheduling classId, get specific information 3545 // the class. 3546 ClassInfo.pc_cid = myClass; 3547 ClassInfo.pc_clname[0] = 0; 3548 rslt = (*priocntl_ptr) (PC_VERSION, (idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo ); 3549 if ( rslt < 0 ) return errno; 3550 3551 if (ThreadPriorityVerbose) 3552 tty->print_cr ("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 3553 3554 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3555 ParmInfo.pc_cid = PC_CLNULL; 3556 rslt = (*priocntl_ptr)(PC_VERSION, P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3557 if (rslt < 0) return errno; 3558 3559 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3560 myMin = rtLimits.minPrio; 3561 myMax = rtLimits.maxPrio; 3562 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3563 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3564 myMin = iaLimits.minPrio; 3565 myMax = iaLimits.maxPrio; 3566 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 3567 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3568 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3569 myMin = tsLimits.minPrio; 3570 myMax = tsLimits.maxPrio; 3571 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 3572 } else { 3573 // No clue - punt 3574 if (ThreadPriorityVerbose) 3575 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname); 3576 return EINVAL; // no clue, punt 3577 } 3578 3579 if (ThreadPriorityVerbose) 3580 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax); 3581 3582 priocntl_enable = true; // Enable changing priorities 3583 return 0; 3584} 3585 3586#define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 3587#define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 3588#define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 3589 3590 3591// scale_to_lwp_priority 3592// 3593// Convert from the libthread "thr_setprio" scale to our current 3594// lwp scheduling class scale. 3595// 3596static 3597int scale_to_lwp_priority (int rMin, int rMax, int x) 3598{ 3599 int v; 3600 3601 if (x == 127) return rMax; // avoid round-down 3602 v = (((x*(rMax-rMin)))/128)+rMin; 3603 return v; 3604} 3605 3606 3607// set_lwp_priority 3608// 3609// Set the priority of the lwp. This call should only be made 3610// when using bound threads (T2 threads are bound by default). 3611// 3612int set_lwp_priority (int ThreadID, int lwpid, int newPrio ) 3613{ 3614 int rslt; 3615 int Actual, Expected, prv; 3616 pcparms_t ParmInfo; // for GET-SET 3617#ifdef ASSERT 3618 pcparms_t ReadBack; // for readback 3619#endif 3620 3621 // Set priority via PC_GETPARMS, update, PC_SETPARMS 3622 // Query current values. 3623 // TODO: accelerate this by eliminating the PC_GETPARMS call. 3624 // Cache "pcparms_t" in global ParmCache. 3625 // TODO: elide set-to-same-value 3626 3627 // If something went wrong on init, don't change priorities. 3628 if ( !priocntl_enable ) { 3629 if (ThreadPriorityVerbose) 3630 tty->print_cr("Trying to set priority but init failed, ignoring"); 3631 return EINVAL; 3632 } 3633 3634 3635 // If lwp hasn't started yet, just return 3636 // the _start routine will call us again. 3637 if ( lwpid <= 0 ) { 3638 if (ThreadPriorityVerbose) { 3639 tty->print_cr ("deferring the set_lwp_priority of thread " INTPTR_FORMAT " to %d, lwpid not set", 3640 ThreadID, newPrio); 3641 } 3642 return 0; 3643 } 3644 3645 if (ThreadPriorityVerbose) { 3646 tty->print_cr ("set_lwp_priority(" INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 3647 ThreadID, lwpid, newPrio); 3648 } 3649 3650 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3651 ParmInfo.pc_cid = PC_CLNULL; 3652 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 3653 if (rslt < 0) return errno; 3654 3655 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3656 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 3657 rtInfo->rt_pri = scale_to_lwp_priority (rtLimits.minPrio, rtLimits.maxPrio, newPrio); 3658 rtInfo->rt_tqsecs = RT_NOCHANGE; 3659 rtInfo->rt_tqnsecs = RT_NOCHANGE; 3660 if (ThreadPriorityVerbose) { 3661 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 3662 } 3663 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3664 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3665 int maxClamped = MIN2(iaLimits.maxPrio, (int)iaInfo->ia_uprilim); 3666 iaInfo->ia_upri = scale_to_lwp_priority(iaLimits.minPrio, maxClamped, newPrio); 3667 iaInfo->ia_uprilim = IA_NOCHANGE; 3668 iaInfo->ia_nice = IA_NOCHANGE; 3669 iaInfo->ia_mode = IA_NOCHANGE; 3670 if (ThreadPriorityVerbose) { 3671 tty->print_cr ("IA: [%d...%d] %d->%d\n", 3672 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 3673 } 3674 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3675 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3676 int maxClamped = MIN2(tsLimits.maxPrio, (int)tsInfo->ts_uprilim); 3677 prv = tsInfo->ts_upri; 3678 tsInfo->ts_upri = scale_to_lwp_priority(tsLimits.minPrio, maxClamped, newPrio); 3679 tsInfo->ts_uprilim = IA_NOCHANGE; 3680 if (ThreadPriorityVerbose) { 3681 tty->print_cr ("TS: %d [%d...%d] %d->%d\n", 3682 prv, tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 3683 } 3684 if (prv == tsInfo->ts_upri) return 0; 3685 } else { 3686 if ( ThreadPriorityVerbose ) { 3687 tty->print_cr ("Unknown scheduling class\n"); 3688 } 3689 return EINVAL; // no clue, punt 3690 } 3691 3692 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 3693 if (ThreadPriorityVerbose && rslt) { 3694 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 3695 } 3696 if (rslt < 0) return errno; 3697 3698#ifdef ASSERT 3699 // Sanity check: read back what we just attempted to set. 3700 // In theory it could have changed in the interim ... 3701 // 3702 // The priocntl system call is tricky. 3703 // Sometimes it'll validate the priority value argument and 3704 // return EINVAL if unhappy. At other times it fails silently. 3705 // Readbacks are prudent. 3706 3707 if (!ReadBackValidate) return 0; 3708 3709 memset(&ReadBack, 0, sizeof(pcparms_t)); 3710 ReadBack.pc_cid = PC_CLNULL; 3711 rslt = (*priocntl_ptr)(PC_VERSION, P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 3712 assert(rslt >= 0, "priocntl failed"); 3713 Actual = Expected = 0xBAD; 3714 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 3715 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3716 Actual = RTPRI(ReadBack)->rt_pri; 3717 Expected = RTPRI(ParmInfo)->rt_pri; 3718 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3719 Actual = IAPRI(ReadBack)->ia_upri; 3720 Expected = IAPRI(ParmInfo)->ia_upri; 3721 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3722 Actual = TSPRI(ReadBack)->ts_upri; 3723 Expected = TSPRI(ParmInfo)->ts_upri; 3724 } else { 3725 if ( ThreadPriorityVerbose ) { 3726 tty->print_cr("set_lwp_priority: unexpected class in readback: %d\n", ParmInfo.pc_cid); 3727 } 3728 } 3729 3730 if (Actual != Expected) { 3731 if ( ThreadPriorityVerbose ) { 3732 tty->print_cr ("set_lwp_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 3733 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 3734 } 3735 } 3736#endif 3737 3738 return 0; 3739} 3740 3741 3742 3743// Solaris only gives access to 128 real priorities at a time, 3744// so we expand Java's ten to fill this range. This would be better 3745// if we dynamically adjusted relative priorities. 3746// 3747// The ThreadPriorityPolicy option allows us to select 2 different 3748// priority scales. 3749// 3750// ThreadPriorityPolicy=0 3751// Since the Solaris' default priority is MaximumPriority, we do not 3752// set a priority lower than Max unless a priority lower than 3753// NormPriority is requested. 3754// 3755// ThreadPriorityPolicy=1 3756// This mode causes the priority table to get filled with 3757// linear values. NormPriority get's mapped to 50% of the 3758// Maximum priority an so on. This will cause VM threads 3759// to get unfair treatment against other Solaris processes 3760// which do not explicitly alter their thread priorities. 3761// 3762 3763 3764int os::java_to_os_priority[MaxPriority + 1] = { 3765 -99999, // 0 Entry should never be used 3766 3767 0, // 1 MinPriority 3768 32, // 2 3769 64, // 3 3770 3771 96, // 4 3772 127, // 5 NormPriority 3773 127, // 6 3774 3775 127, // 7 3776 127, // 8 3777 127, // 9 NearMaxPriority 3778 3779 127 // 10 MaxPriority 3780}; 3781 3782 3783OSReturn os::set_native_priority(Thread* thread, int newpri) { 3784 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 3785 if ( !UseThreadPriorities ) return OS_OK; 3786 int status = thr_setprio(thread->osthread()->thread_id(), newpri); 3787 if ( os::Solaris::T2_libthread() || (UseBoundThreads && thread->osthread()->is_vm_created()) ) 3788 status |= (set_lwp_priority (thread->osthread()->thread_id(), 3789 thread->osthread()->lwp_id(), newpri )); 3790 return (status == 0) ? OS_OK : OS_ERR; 3791} 3792 3793 3794OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 3795 int p; 3796 if ( !UseThreadPriorities ) { 3797 *priority_ptr = NormalPriority; 3798 return OS_OK; 3799 } 3800 int status = thr_getprio(thread->osthread()->thread_id(), &p); 3801 if (status != 0) { 3802 return OS_ERR; 3803 } 3804 *priority_ptr = p; 3805 return OS_OK; 3806} 3807 3808 3809// Hint to the underlying OS that a task switch would not be good. 3810// Void return because it's a hint and can fail. 3811void os::hint_no_preempt() { 3812 schedctl_start(schedctl_init()); 3813} 3814 3815void os::interrupt(Thread* thread) { 3816 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer"); 3817 3818 OSThread* osthread = thread->osthread(); 3819 3820 int isInterrupted = osthread->interrupted(); 3821 if (!isInterrupted) { 3822 osthread->set_interrupted(true); 3823 OrderAccess::fence(); 3824 // os::sleep() is implemented with either poll (NULL,0,timeout) or 3825 // by parking on _SleepEvent. If the former, thr_kill will unwedge 3826 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper. 3827 ParkEvent * const slp = thread->_SleepEvent ; 3828 if (slp != NULL) slp->unpark() ; 3829 } 3830 3831 // For JSR166: unpark after setting status but before thr_kill -dl 3832 if (thread->is_Java_thread()) { 3833 ((JavaThread*)thread)->parker()->unpark(); 3834 } 3835 3836 // Handle interruptible wait() ... 3837 ParkEvent * const ev = thread->_ParkEvent ; 3838 if (ev != NULL) ev->unpark() ; 3839 3840 // When events are used everywhere for os::sleep, then this thr_kill 3841 // will only be needed if UseVMInterruptibleIO is true. 3842 3843 if (!isInterrupted) { 3844 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt()); 3845 assert_status(status == 0, status, "thr_kill"); 3846 3847 // Bump thread interruption counter 3848 RuntimeService::record_thread_interrupt_signaled_count(); 3849 } 3850} 3851 3852 3853bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 3854 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer"); 3855 3856 OSThread* osthread = thread->osthread(); 3857 3858 bool res = osthread->interrupted(); 3859 3860 // NOTE that since there is no "lock" around these two operations, 3861 // there is the possibility that the interrupted flag will be 3862 // "false" but that the interrupt event will be set. This is 3863 // intentional. The effect of this is that Object.wait() will appear 3864 // to have a spurious wakeup, which is not harmful, and the 3865 // possibility is so rare that it is not worth the added complexity 3866 // to add yet another lock. It has also been recommended not to put 3867 // the interrupted flag into the os::Solaris::Event structure, 3868 // because it hides the issue. 3869 if (res && clear_interrupted) { 3870 osthread->set_interrupted(false); 3871 } 3872 return res; 3873} 3874 3875 3876void os::print_statistics() { 3877} 3878 3879int os::message_box(const char* title, const char* message) { 3880 int i; 3881 fdStream err(defaultStream::error_fd()); 3882 for (i = 0; i < 78; i++) err.print_raw("="); 3883 err.cr(); 3884 err.print_raw_cr(title); 3885 for (i = 0; i < 78; i++) err.print_raw("-"); 3886 err.cr(); 3887 err.print_raw_cr(message); 3888 for (i = 0; i < 78; i++) err.print_raw("="); 3889 err.cr(); 3890 3891 char buf[16]; 3892 // Prevent process from exiting upon "read error" without consuming all CPU 3893 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3894 3895 return buf[0] == 'y' || buf[0] == 'Y'; 3896} 3897 3898// A lightweight implementation that does not suspend the target thread and 3899// thus returns only a hint. Used for profiling only! 3900ExtendedPC os::get_thread_pc(Thread* thread) { 3901 // Make sure that it is called by the watcher and the Threads lock is owned. 3902 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock"); 3903 // For now, is only used to profile the VM Thread 3904 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3905 ExtendedPC epc; 3906 3907 GetThreadPC_Callback cb(ProfileVM_lock); 3908 OSThread *osthread = thread->osthread(); 3909 const int time_to_wait = 400; // 400ms wait for initial response 3910 int status = cb.interrupt(thread, time_to_wait); 3911 3912 if (cb.is_done() ) { 3913 epc = cb.addr(); 3914 } else { 3915 DEBUG_ONLY(tty->print_cr("Failed to get pc for thread: %d got %d status", 3916 osthread->thread_id(), status);); 3917 // epc is already NULL 3918 } 3919 return epc; 3920} 3921 3922 3923// This does not do anything on Solaris. This is basically a hook for being 3924// able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 3925void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) { 3926 f(value, method, args, thread); 3927} 3928 3929// This routine may be used by user applications as a "hook" to catch signals. 3930// The user-defined signal handler must pass unrecognized signals to this 3931// routine, and if it returns true (non-zero), then the signal handler must 3932// return immediately. If the flag "abort_if_unrecognized" is true, then this 3933// routine will never retun false (zero), but instead will execute a VM panic 3934// routine kill the process. 3935// 3936// If this routine returns false, it is OK to call it again. This allows 3937// the user-defined signal handler to perform checks either before or after 3938// the VM performs its own checks. Naturally, the user code would be making 3939// a serious error if it tried to handle an exception (such as a null check 3940// or breakpoint) that the VM was generating for its own correct operation. 3941// 3942// This routine may recognize any of the following kinds of signals: 3943// SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 3944// os::Solaris::SIGasync 3945// It should be consulted by handlers for any of those signals. 3946// It explicitly does not recognize os::Solaris::SIGinterrupt 3947// 3948// The caller of this routine must pass in the three arguments supplied 3949// to the function referred to in the "sa_sigaction" (not the "sa_handler") 3950// field of the structure passed to sigaction(). This routine assumes that 3951// the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3952// 3953// Note that the VM will print warnings if it detects conflicting signal 3954// handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3955// 3956extern "C" int JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized); 3957 3958 3959void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 3960 JVM_handle_solaris_signal(sig, info, ucVoid, true); 3961} 3962 3963/* Do not delete - if guarantee is ever removed, a signal handler (even empty) 3964 is needed to provoke threads blocked on IO to return an EINTR 3965 Note: this explicitly does NOT call JVM_handle_solaris_signal and 3966 does NOT participate in signal chaining due to requirement for 3967 NOT setting SA_RESTART to make EINTR work. */ 3968extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) { 3969 if (UseSignalChaining) { 3970 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig); 3971 if (actp && actp->sa_handler) { 3972 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs"); 3973 } 3974 } 3975} 3976 3977// This boolean allows users to forward their own non-matching signals 3978// to JVM_handle_solaris_signal, harmlessly. 3979bool os::Solaris::signal_handlers_are_installed = false; 3980 3981// For signal-chaining 3982bool os::Solaris::libjsig_is_loaded = false; 3983typedef struct sigaction *(*get_signal_t)(int); 3984get_signal_t os::Solaris::get_signal_action = NULL; 3985 3986struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 3987 struct sigaction *actp = NULL; 3988 3989 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) { 3990 // Retrieve the old signal handler from libjsig 3991 actp = (*get_signal_action)(sig); 3992 } 3993 if (actp == NULL) { 3994 // Retrieve the preinstalled signal handler from jvm 3995 actp = get_preinstalled_handler(sig); 3996 } 3997 3998 return actp; 3999} 4000 4001static bool call_chained_handler(struct sigaction *actp, int sig, 4002 siginfo_t *siginfo, void *context) { 4003 // Call the old signal handler 4004 if (actp->sa_handler == SIG_DFL) { 4005 // It's more reasonable to let jvm treat it as an unexpected exception 4006 // instead of taking the default action. 4007 return false; 4008 } else if (actp->sa_handler != SIG_IGN) { 4009 if ((actp->sa_flags & SA_NODEFER) == 0) { 4010 // automaticlly block the signal 4011 sigaddset(&(actp->sa_mask), sig); 4012 } 4013 4014 sa_handler_t hand; 4015 sa_sigaction_t sa; 4016 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 4017 // retrieve the chained handler 4018 if (siginfo_flag_set) { 4019 sa = actp->sa_sigaction; 4020 } else { 4021 hand = actp->sa_handler; 4022 } 4023 4024 if ((actp->sa_flags & SA_RESETHAND) != 0) { 4025 actp->sa_handler = SIG_DFL; 4026 } 4027 4028 // try to honor the signal mask 4029 sigset_t oset; 4030 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset); 4031 4032 // call into the chained handler 4033 if (siginfo_flag_set) { 4034 (*sa)(sig, siginfo, context); 4035 } else { 4036 (*hand)(sig); 4037 } 4038 4039 // restore the signal mask 4040 thr_sigsetmask(SIG_SETMASK, &oset, 0); 4041 } 4042 // Tell jvm's signal handler the signal is taken care of. 4043 return true; 4044} 4045 4046bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 4047 bool chained = false; 4048 // signal-chaining 4049 if (UseSignalChaining) { 4050 struct sigaction *actp = get_chained_signal_action(sig); 4051 if (actp != NULL) { 4052 chained = call_chained_handler(actp, sig, siginfo, context); 4053 } 4054 } 4055 return chained; 4056} 4057 4058struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 4059 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized"); 4060 if (preinstalled_sigs[sig] != 0) { 4061 return &chainedsigactions[sig]; 4062 } 4063 return NULL; 4064} 4065 4066void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 4067 4068 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 4069 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized"); 4070 chainedsigactions[sig] = oldAct; 4071 preinstalled_sigs[sig] = 1; 4072} 4073 4074void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) { 4075 // Check for overwrite. 4076 struct sigaction oldAct; 4077 sigaction(sig, (struct sigaction*)NULL, &oldAct); 4078 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4079 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4080 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 4081 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 4082 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 4083 if (AllowUserSignalHandlers || !set_installed) { 4084 // Do not overwrite; user takes responsibility to forward to us. 4085 return; 4086 } else if (UseSignalChaining) { 4087 if (oktochain) { 4088 // save the old handler in jvm 4089 save_preinstalled_handler(sig, oldAct); 4090 } else { 4091 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs."); 4092 } 4093 // libjsig also interposes the sigaction() call below and saves the 4094 // old sigaction on it own. 4095 } else { 4096 fatal2("Encountered unexpected pre-existing sigaction handler %#lx for signal %d.", (long)oldhand, sig); 4097 } 4098 } 4099 4100 struct sigaction sigAct; 4101 sigfillset(&(sigAct.sa_mask)); 4102 sigAct.sa_handler = SIG_DFL; 4103 4104 sigAct.sa_sigaction = signalHandler; 4105 // Handle SIGSEGV on alternate signal stack if 4106 // not using stack banging 4107 if (!UseStackBanging && sig == SIGSEGV) { 4108 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 4109 // Interruptible i/o requires SA_RESTART cleared so EINTR 4110 // is returned instead of restarting system calls 4111 } else if (sig == os::Solaris::SIGinterrupt()) { 4112 sigemptyset(&sigAct.sa_mask); 4113 sigAct.sa_handler = NULL; 4114 sigAct.sa_flags = SA_SIGINFO; 4115 sigAct.sa_sigaction = sigINTRHandler; 4116 } else { 4117 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 4118 } 4119 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 4120 4121 sigaction(sig, &sigAct, &oldAct); 4122 4123 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4124 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4125 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 4126} 4127 4128 4129#define DO_SIGNAL_CHECK(sig) \ 4130 if (!sigismember(&check_signal_done, sig)) \ 4131 os::Solaris::check_signal_handler(sig) 4132 4133// This method is a periodic task to check for misbehaving JNI applications 4134// under CheckJNI, we can add any periodic checks here 4135 4136void os::run_periodic_checks() { 4137 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 4138 // thereby preventing a NULL checks. 4139 if(!check_addr0_done) check_addr0_done = check_addr0(tty); 4140 4141 if (check_signals == false) return; 4142 4143 // SEGV and BUS if overridden could potentially prevent 4144 // generation of hs*.log in the event of a crash, debugging 4145 // such a case can be very challenging, so we absolutely 4146 // check for the following for a good measure: 4147 DO_SIGNAL_CHECK(SIGSEGV); 4148 DO_SIGNAL_CHECK(SIGILL); 4149 DO_SIGNAL_CHECK(SIGFPE); 4150 DO_SIGNAL_CHECK(SIGBUS); 4151 DO_SIGNAL_CHECK(SIGPIPE); 4152 DO_SIGNAL_CHECK(SIGXFSZ); 4153 4154 // ReduceSignalUsage allows the user to override these handlers 4155 // see comments at the very top and jvm_solaris.h 4156 if (!ReduceSignalUsage) { 4157 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 4158 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 4159 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 4160 DO_SIGNAL_CHECK(BREAK_SIGNAL); 4161 } 4162 4163 // See comments above for using JVM1/JVM2 and UseAltSigs 4164 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt()); 4165 DO_SIGNAL_CHECK(os::Solaris::SIGasync()); 4166 4167} 4168 4169typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 4170 4171static os_sigaction_t os_sigaction = NULL; 4172 4173void os::Solaris::check_signal_handler(int sig) { 4174 char buf[O_BUFLEN]; 4175 address jvmHandler = NULL; 4176 4177 struct sigaction act; 4178 if (os_sigaction == NULL) { 4179 // only trust the default sigaction, in case it has been interposed 4180 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 4181 if (os_sigaction == NULL) return; 4182 } 4183 4184 os_sigaction(sig, (struct sigaction*)NULL, &act); 4185 4186 address thisHandler = (act.sa_flags & SA_SIGINFO) 4187 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 4188 : CAST_FROM_FN_PTR(address, act.sa_handler) ; 4189 4190 4191 switch(sig) { 4192 case SIGSEGV: 4193 case SIGBUS: 4194 case SIGFPE: 4195 case SIGPIPE: 4196 case SIGXFSZ: 4197 case SIGILL: 4198 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4199 break; 4200 4201 case SHUTDOWN1_SIGNAL: 4202 case SHUTDOWN2_SIGNAL: 4203 case SHUTDOWN3_SIGNAL: 4204 case BREAK_SIGNAL: 4205 jvmHandler = (address)user_handler(); 4206 break; 4207 4208 default: 4209 int intrsig = os::Solaris::SIGinterrupt(); 4210 int asynsig = os::Solaris::SIGasync(); 4211 4212 if (sig == intrsig) { 4213 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler); 4214 } else if (sig == asynsig) { 4215 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4216 } else { 4217 return; 4218 } 4219 break; 4220 } 4221 4222 4223 if (thisHandler != jvmHandler) { 4224 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 4225 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 4226 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 4227 // No need to check this sig any longer 4228 sigaddset(&check_signal_done, sig); 4229 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 4230 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 4231 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig)); 4232 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); 4233 // No need to check this sig any longer 4234 sigaddset(&check_signal_done, sig); 4235 } 4236 4237 // Print all the signal handler state 4238 if (sigismember(&check_signal_done, sig)) { 4239 print_signal_handlers(tty, buf, O_BUFLEN); 4240 } 4241 4242} 4243 4244void os::Solaris::install_signal_handlers() { 4245 bool libjsigdone = false; 4246 signal_handlers_are_installed = true; 4247 4248 // signal-chaining 4249 typedef void (*signal_setting_t)(); 4250 signal_setting_t begin_signal_setting = NULL; 4251 signal_setting_t end_signal_setting = NULL; 4252 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4253 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 4254 if (begin_signal_setting != NULL) { 4255 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4256 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 4257 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 4258 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 4259 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t, 4260 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version")); 4261 libjsig_is_loaded = true; 4262 if (os::Solaris::get_libjsig_version != NULL) { 4263 libjsigversion = (*os::Solaris::get_libjsig_version)(); 4264 } 4265 assert(UseSignalChaining, "should enable signal-chaining"); 4266 } 4267 if (libjsig_is_loaded) { 4268 // Tell libjsig jvm is setting signal handlers 4269 (*begin_signal_setting)(); 4270 } 4271 4272 set_signal_handler(SIGSEGV, true, true); 4273 set_signal_handler(SIGPIPE, true, true); 4274 set_signal_handler(SIGXFSZ, true, true); 4275 set_signal_handler(SIGBUS, true, true); 4276 set_signal_handler(SIGILL, true, true); 4277 set_signal_handler(SIGFPE, true, true); 4278 4279 4280 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) { 4281 4282 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so 4283 // can not register overridable signals which might be > 32 4284 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) { 4285 // Tell libjsig jvm has finished setting signal handlers 4286 (*end_signal_setting)(); 4287 libjsigdone = true; 4288 } 4289 } 4290 4291 // Never ok to chain our SIGinterrupt 4292 set_signal_handler(os::Solaris::SIGinterrupt(), true, false); 4293 set_signal_handler(os::Solaris::SIGasync(), true, true); 4294 4295 if (libjsig_is_loaded && !libjsigdone) { 4296 // Tell libjsig jvm finishes setting signal handlers 4297 (*end_signal_setting)(); 4298 } 4299 4300 // We don't activate signal checker if libjsig is in place, we trust ourselves 4301 // and if UserSignalHandler is installed all bets are off 4302 if (CheckJNICalls) { 4303 if (libjsig_is_loaded) { 4304 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 4305 check_signals = false; 4306 } 4307 if (AllowUserSignalHandlers) { 4308 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 4309 check_signals = false; 4310 } 4311 } 4312} 4313 4314 4315void report_error(const char* file_name, int line_no, const char* title, const char* format, ...); 4316 4317const char * signames[] = { 4318 "SIG0", 4319 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP", 4320 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS", 4321 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM", 4322 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH", 4323 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT", 4324 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU", 4325 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW", 4326 "SIGCANCEL", "SIGLOST" 4327}; 4328 4329const char* os::exception_name(int exception_code, char* buf, size_t size) { 4330 if (0 < exception_code && exception_code <= SIGRTMAX) { 4331 // signal 4332 if (exception_code < sizeof(signames)/sizeof(const char*)) { 4333 jio_snprintf(buf, size, "%s", signames[exception_code]); 4334 } else { 4335 jio_snprintf(buf, size, "SIG%d", exception_code); 4336 } 4337 return buf; 4338 } else { 4339 return NULL; 4340 } 4341} 4342 4343// (Static) wrappers for the new libthread API 4344int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate; 4345int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate; 4346int_fnP_thread_t_i os::Solaris::_thr_setmutator; 4347int_fnP_thread_t os::Solaris::_thr_suspend_mutator; 4348int_fnP_thread_t os::Solaris::_thr_continue_mutator; 4349 4350// (Static) wrappers for the liblgrp API 4351os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 4352os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 4353os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 4354os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 4355os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 4356os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 4357os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 4358os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 4359 4360// (Static) wrapper for meminfo() call. 4361os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0; 4362 4363static address resolve_symbol(const char *name) { 4364 address addr; 4365 4366 addr = (address) dlsym(RTLD_DEFAULT, name); 4367 if(addr == NULL) { 4368 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 4369 addr = (address) dlsym(RTLD_NEXT, name); 4370 if(addr == NULL) { 4371 fatal(dlerror()); 4372 } 4373 } 4374 return addr; 4375} 4376 4377 4378 4379// isT2_libthread() 4380// 4381// Routine to determine if we are currently using the new T2 libthread. 4382// 4383// We determine if we are using T2 by reading /proc/self/lstatus and 4384// looking for a thread with the ASLWP bit set. If we find this status 4385// bit set, we must assume that we are NOT using T2. The T2 team 4386// has approved this algorithm. 4387// 4388// We need to determine if we are running with the new T2 libthread 4389// since setting native thread priorities is handled differently 4390// when using this library. All threads created using T2 are bound 4391// threads. Calling thr_setprio is meaningless in this case. 4392// 4393bool isT2_libthread() { 4394 static prheader_t * lwpArray = NULL; 4395 static int lwpSize = 0; 4396 static int lwpFile = -1; 4397 lwpstatus_t * that; 4398 char lwpName [128]; 4399 bool isT2 = false; 4400 4401#define ADR(x) ((uintptr_t)(x)) 4402#define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1)))) 4403 4404 lwpFile = open("/proc/self/lstatus", O_RDONLY, 0); 4405 if (lwpFile < 0) { 4406 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n"); 4407 return false; 4408 } 4409 lwpSize = 16*1024; 4410 for (;;) { 4411 lseek (lwpFile, 0, SEEK_SET); 4412 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize); 4413 if (read(lwpFile, lwpArray, lwpSize) < 0) { 4414 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n"); 4415 break; 4416 } 4417 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) { 4418 // We got a good snapshot - now iterate over the list. 4419 int aslwpcount = 0; 4420 for (int i = 0; i < lwpArray->pr_nent; i++ ) { 4421 that = LWPINDEX(lwpArray,i); 4422 if (that->pr_flags & PR_ASLWP) { 4423 aslwpcount++; 4424 } 4425 } 4426 if (aslwpcount == 0) isT2 = true; 4427 break; 4428 } 4429 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize; 4430 FREE_C_HEAP_ARRAY(char, lwpArray); // retry. 4431 } 4432 4433 FREE_C_HEAP_ARRAY(char, lwpArray); 4434 close (lwpFile); 4435 if (ThreadPriorityVerbose) { 4436 if (isT2) tty->print_cr("We are running with a T2 libthread\n"); 4437 else tty->print_cr("We are not running with a T2 libthread\n"); 4438 } 4439 return isT2; 4440} 4441 4442 4443void os::Solaris::libthread_init() { 4444 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 4445 4446 // Determine if we are running with the new T2 libthread 4447 os::Solaris::set_T2_libthread(isT2_libthread()); 4448 4449 lwp_priocntl_init(); 4450 4451 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 4452 if(func == NULL) { 4453 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 4454 // Guarantee that this VM is running on an new enough OS (5.6 or 4455 // later) that it will have a new enough libthread.so. 4456 guarantee(func != NULL, "libthread.so is too old."); 4457 } 4458 4459 // Initialize the new libthread getstate API wrappers 4460 func = resolve_symbol("thr_getstate"); 4461 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func)); 4462 4463 func = resolve_symbol("thr_setstate"); 4464 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func)); 4465 4466 func = resolve_symbol("thr_setmutator"); 4467 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func)); 4468 4469 func = resolve_symbol("thr_suspend_mutator"); 4470 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func)); 4471 4472 func = resolve_symbol("thr_continue_mutator"); 4473 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func)); 4474 4475 int size; 4476 void (*handler_info_func)(address *, int *); 4477 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 4478 handler_info_func(&handler_start, &size); 4479 handler_end = handler_start + size; 4480} 4481 4482 4483int_fnP_mutex_tP os::Solaris::_mutex_lock; 4484int_fnP_mutex_tP os::Solaris::_mutex_trylock; 4485int_fnP_mutex_tP os::Solaris::_mutex_unlock; 4486int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 4487int_fnP_mutex_tP os::Solaris::_mutex_destroy; 4488int os::Solaris::_mutex_scope = USYNC_THREAD; 4489 4490int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 4491int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 4492int_fnP_cond_tP os::Solaris::_cond_signal; 4493int_fnP_cond_tP os::Solaris::_cond_broadcast; 4494int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 4495int_fnP_cond_tP os::Solaris::_cond_destroy; 4496int os::Solaris::_cond_scope = USYNC_THREAD; 4497 4498void os::Solaris::synchronization_init() { 4499 if(UseLWPSynchronization) { 4500 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 4501 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 4502 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 4503 os::Solaris::set_mutex_init(lwp_mutex_init); 4504 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 4505 os::Solaris::set_mutex_scope(USYNC_THREAD); 4506 4507 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 4508 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 4509 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 4510 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 4511 os::Solaris::set_cond_init(lwp_cond_init); 4512 os::Solaris::set_cond_destroy(lwp_cond_destroy); 4513 os::Solaris::set_cond_scope(USYNC_THREAD); 4514 } 4515 else { 4516 os::Solaris::set_mutex_scope(USYNC_THREAD); 4517 os::Solaris::set_cond_scope(USYNC_THREAD); 4518 4519 if(UsePthreads) { 4520 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 4521 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 4522 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 4523 os::Solaris::set_mutex_init(pthread_mutex_default_init); 4524 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 4525 4526 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 4527 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 4528 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 4529 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 4530 os::Solaris::set_cond_init(pthread_cond_default_init); 4531 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 4532 } 4533 else { 4534 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 4535 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 4536 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 4537 os::Solaris::set_mutex_init(::mutex_init); 4538 os::Solaris::set_mutex_destroy(::mutex_destroy); 4539 4540 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 4541 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 4542 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 4543 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 4544 os::Solaris::set_cond_init(::cond_init); 4545 os::Solaris::set_cond_destroy(::cond_destroy); 4546 } 4547 } 4548} 4549 4550void os::Solaris::liblgrp_init() { 4551 void *handle = dlopen("liblgrp.so", RTLD_LAZY); 4552 if (handle != NULL) { 4553 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 4554 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 4555 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 4556 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 4557 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 4558 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 4559 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 4560 dlsym(handle, "lgrp_cookie_stale"))); 4561 4562 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 4563 set_lgrp_cookie(c); 4564 } else { 4565 warning("your OS does not support NUMA"); 4566 } 4567} 4568 4569void os::Solaris::misc_sym_init() { 4570 address func = (address)dlsym(RTLD_DEFAULT, "meminfo"); 4571 if(func == NULL) { 4572 func = (address) dlsym(RTLD_NEXT, "meminfo"); 4573 } 4574 if (func != NULL) { 4575 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func)); 4576 } 4577} 4578 4579// Symbol doesn't exist in Solaris 8 pset.h 4580#ifndef PS_MYID 4581#define PS_MYID -3 4582#endif 4583 4584// int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 4585typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 4586static pset_getloadavg_type pset_getloadavg_ptr = NULL; 4587 4588void init_pset_getloadavg_ptr(void) { 4589 pset_getloadavg_ptr = 4590 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 4591 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) { 4592 warning("pset_getloadavg function not found"); 4593 } 4594} 4595 4596int os::Solaris::_dev_zero_fd = -1; 4597 4598// this is called _before_ the global arguments have been parsed 4599void os::init(void) { 4600 _initial_pid = getpid(); 4601 4602 max_hrtime = first_hrtime = gethrtime(); 4603 4604 init_random(1234567); 4605 4606 page_size = sysconf(_SC_PAGESIZE); 4607 if (page_size == -1) 4608 fatal1("os_solaris.cpp: os::init: sysconf failed (%s)", strerror(errno)); 4609 init_page_sizes((size_t) page_size); 4610 4611 Solaris::initialize_system_info(); 4612 4613 int fd = open("/dev/zero", O_RDWR); 4614 if (fd < 0) { 4615 fatal1("os::init: cannot open /dev/zero (%s)", strerror(errno)); 4616 } else { 4617 Solaris::set_dev_zero_fd(fd); 4618 4619 // Close on exec, child won't inherit. 4620 fcntl(fd, F_SETFD, FD_CLOEXEC); 4621 } 4622 4623 clock_tics_per_sec = CLK_TCK; 4624 4625 // check if dladdr1() exists; dladdr1 can provide more information than 4626 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 4627 // and is available on linker patches for 5.7 and 5.8. 4628 // libdl.so must have been loaded, this call is just an entry lookup 4629 void * hdl = dlopen("libdl.so", RTLD_NOW); 4630 if (hdl) 4631 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 4632 4633 // (Solaris only) this switches to calls that actually do locking. 4634 ThreadCritical::initialize(); 4635 4636 main_thread = thr_self(); 4637 4638 // Constant minimum stack size allowed. It must be at least 4639 // the minimum of what the OS supports (thr_min_stack()), and 4640 // enough to allow the thread to get to user bytecode execution. 4641 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed); 4642 // If the pagesize of the VM is greater than 8K determine the appropriate 4643 // number of initial guard pages. The user can change this with the 4644 // command line arguments, if needed. 4645 if (vm_page_size() > 8*K) { 4646 StackYellowPages = 1; 4647 StackRedPages = 1; 4648 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size(); 4649 } 4650} 4651 4652// To install functions for atexit system call 4653extern "C" { 4654 static void perfMemory_exit_helper() { 4655 perfMemory_exit(); 4656 } 4657} 4658 4659// this is called _after_ the global arguments have been parsed 4660jint os::init_2(void) { 4661 // try to enable extended file IO ASAP, see 6431278 4662 os::Solaris::try_enable_extended_io(); 4663 4664 // Allocate a single page and mark it as readable for safepoint polling. Also 4665 // use this first mmap call to check support for MAP_ALIGN. 4666 address polling_page = (address)Solaris::mmap_chunk((char*)page_size, 4667 page_size, 4668 MAP_PRIVATE | MAP_ALIGN, 4669 PROT_READ); 4670 if (polling_page == NULL) { 4671 has_map_align = false; 4672 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, 4673 PROT_READ); 4674 } 4675 4676 os::set_polling_page(polling_page); 4677 4678#ifndef PRODUCT 4679 if( Verbose && PrintMiscellaneous ) 4680 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 4681#endif 4682 4683 if (!UseMembar) { 4684 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE ); 4685 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 4686 os::set_memory_serialize_page( mem_serialize_page ); 4687 4688#ifndef PRODUCT 4689 if(Verbose && PrintMiscellaneous) 4690 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 4691#endif 4692} 4693 4694 FLAG_SET_DEFAULT(UseLargePages, os::large_page_init()); 4695 4696 // Check minimum allowable stack size for thread creation and to initialize 4697 // the java system classes, including StackOverflowError - depends on page 4698 // size. Add a page for compiler2 recursion in main thread. 4699 // Add in BytesPerWord times page size to account for VM stack during 4700 // class initialization depending on 32 or 64 bit VM. 4701 guarantee((Solaris::min_stack_allowed >= 4702 (StackYellowPages+StackRedPages+StackShadowPages+BytesPerWord 4703 COMPILER2_PRESENT(+1)) * page_size), 4704 "need to increase Solaris::min_stack_allowed on this platform"); 4705 4706 size_t threadStackSizeInBytes = ThreadStackSize * K; 4707 if (threadStackSizeInBytes != 0 && 4708 threadStackSizeInBytes < Solaris::min_stack_allowed) { 4709 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk", 4710 Solaris::min_stack_allowed/K); 4711 return JNI_ERR; 4712 } 4713 4714 // For 64kbps there will be a 64kb page size, which makes 4715 // the usable default stack size quite a bit less. Increase the 4716 // stack for 64kb (or any > than 8kb) pages, this increases 4717 // virtual memory fragmentation (since we're not creating the 4718 // stack on a power of 2 boundary. The real fix for this 4719 // should be to fix the guard page mechanism. 4720 4721 if (vm_page_size() > 8*K) { 4722 threadStackSizeInBytes = (threadStackSizeInBytes != 0) 4723 ? threadStackSizeInBytes + 4724 ((StackYellowPages + StackRedPages) * vm_page_size()) 4725 : 0; 4726 ThreadStackSize = threadStackSizeInBytes/K; 4727 } 4728 4729 // Make the stack size a multiple of the page size so that 4730 // the yellow/red zones can be guarded. 4731 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 4732 vm_page_size())); 4733 4734 Solaris::libthread_init(); 4735 if (UseNUMA) { 4736 Solaris::liblgrp_init(); 4737 } 4738 Solaris::misc_sym_init(); 4739 Solaris::signal_sets_init(); 4740 Solaris::init_signal_mem(); 4741 Solaris::install_signal_handlers(); 4742 4743 if (libjsigversion < JSIG_VERSION_1_4_1) { 4744 Maxlibjsigsigs = OLDMAXSIGNUM; 4745 } 4746 4747 // initialize synchronization primitives to use either thread or 4748 // lwp synchronization (controlled by UseLWPSynchronization) 4749 Solaris::synchronization_init(); 4750 4751 if (MaxFDLimit) { 4752 // set the number of file descriptors to max. print out error 4753 // if getrlimit/setrlimit fails but continue regardless. 4754 struct rlimit nbr_files; 4755 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 4756 if (status != 0) { 4757 if (PrintMiscellaneous && (Verbose || WizardMode)) 4758 perror("os::init_2 getrlimit failed"); 4759 } else { 4760 nbr_files.rlim_cur = nbr_files.rlim_max; 4761 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 4762 if (status != 0) { 4763 if (PrintMiscellaneous && (Verbose || WizardMode)) 4764 perror("os::init_2 setrlimit failed"); 4765 } 4766 } 4767 } 4768 4769 // Initialize HPI. 4770 jint hpi_result = hpi::initialize(); 4771 if (hpi_result != JNI_OK) { 4772 tty->print_cr("There was an error trying to initialize the HPI library."); 4773 return hpi_result; 4774 } 4775 4776 // Calculate theoretical max. size of Threads to guard gainst 4777 // artifical out-of-memory situations, where all available address- 4778 // space has been reserved by thread stacks. Default stack size is 1Mb. 4779 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 4780 JavaThread::stack_size_at_create() : (1*K*K); 4781 assert(pre_thread_stack_size != 0, "Must have a stack"); 4782 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 4783 // we should start doing Virtual Memory banging. Currently when the threads will 4784 // have used all but 200Mb of space. 4785 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 4786 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 4787 4788 // at-exit methods are called in the reverse order of their registration. 4789 // In Solaris 7 and earlier, atexit functions are called on return from 4790 // main or as a result of a call to exit(3C). There can be only 32 of 4791 // these functions registered and atexit() does not set errno. In Solaris 4792 // 8 and later, there is no limit to the number of functions registered 4793 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 4794 // functions are called upon dlclose(3DL) in addition to return from main 4795 // and exit(3C). 4796 4797 if (PerfAllowAtExitRegistration) { 4798 // only register atexit functions if PerfAllowAtExitRegistration is set. 4799 // atexit functions can be delayed until process exit time, which 4800 // can be problematic for embedded VM situations. Embedded VMs should 4801 // call DestroyJavaVM() to assure that VM resources are released. 4802 4803 // note: perfMemory_exit_helper atexit function may be removed in 4804 // the future if the appropriate cleanup code can be added to the 4805 // VM_Exit VMOperation's doit method. 4806 if (atexit(perfMemory_exit_helper) != 0) { 4807 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 4808 } 4809 } 4810 4811 // Init pset_loadavg function pointer 4812 init_pset_getloadavg_ptr(); 4813 4814 return JNI_OK; 4815} 4816 4817 4818// Mark the polling page as unreadable 4819void os::make_polling_page_unreadable(void) { 4820 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 ) 4821 fatal("Could not disable polling page"); 4822}; 4823 4824// Mark the polling page as readable 4825void os::make_polling_page_readable(void) { 4826 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 ) 4827 fatal("Could not enable polling page"); 4828}; 4829 4830// OS interface. 4831 4832int os::stat(const char *path, struct stat *sbuf) { 4833 char pathbuf[MAX_PATH]; 4834 if (strlen(path) > MAX_PATH - 1) { 4835 errno = ENAMETOOLONG; 4836 return -1; 4837 } 4838 hpi::native_path(strcpy(pathbuf, path)); 4839 return ::stat(pathbuf, sbuf); 4840} 4841 4842 4843bool os::check_heap(bool force) { return true; } 4844 4845typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr); 4846static vsnprintf_t sol_vsnprintf = NULL; 4847 4848int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) { 4849 if (!sol_vsnprintf) { 4850 //search for the named symbol in the objects that were loaded after libjvm 4851 void* where = RTLD_NEXT; 4852 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL) 4853 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf")); 4854 if (!sol_vsnprintf){ 4855 //search for the named symbol in the objects that were loaded before libjvm 4856 where = RTLD_DEFAULT; 4857 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL) 4858 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf")); 4859 assert(sol_vsnprintf != NULL, "vsnprintf not found"); 4860 } 4861 } 4862 return (*sol_vsnprintf)(buf, count, fmt, argptr); 4863} 4864 4865 4866// Is a (classpath) directory empty? 4867bool os::dir_is_empty(const char* path) { 4868 DIR *dir = NULL; 4869 struct dirent *ptr; 4870 4871 dir = opendir(path); 4872 if (dir == NULL) return true; 4873 4874 /* Scan the directory */ 4875 bool result = true; 4876 char buf[sizeof(struct dirent) + MAX_PATH]; 4877 struct dirent *dbuf = (struct dirent *) buf; 4878 while (result && (ptr = readdir(dir, dbuf)) != NULL) { 4879 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 4880 result = false; 4881 } 4882 } 4883 closedir(dir); 4884 return result; 4885} 4886 4887// create binary file, rewriting existing file if required 4888int os::create_binary_file(const char* path, bool rewrite_existing) { 4889 int oflags = O_WRONLY | O_CREAT; 4890 if (!rewrite_existing) { 4891 oflags |= O_EXCL; 4892 } 4893 return ::open64(path, oflags, S_IREAD | S_IWRITE); 4894} 4895 4896// return current position of file pointer 4897jlong os::current_file_offset(int fd) { 4898 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 4899} 4900 4901// move file pointer to the specified offset 4902jlong os::seek_to_file_offset(int fd, jlong offset) { 4903 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 4904} 4905 4906// Map a block of memory. 4907char* os::map_memory(int fd, const char* file_name, size_t file_offset, 4908 char *addr, size_t bytes, bool read_only, 4909 bool allow_exec) { 4910 int prot; 4911 int flags; 4912 4913 if (read_only) { 4914 prot = PROT_READ; 4915 flags = MAP_SHARED; 4916 } else { 4917 prot = PROT_READ | PROT_WRITE; 4918 flags = MAP_PRIVATE; 4919 } 4920 4921 if (allow_exec) { 4922 prot |= PROT_EXEC; 4923 } 4924 4925 if (addr != NULL) { 4926 flags |= MAP_FIXED; 4927 } 4928 4929 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 4930 fd, file_offset); 4931 if (mapped_address == MAP_FAILED) { 4932 return NULL; 4933 } 4934 return mapped_address; 4935} 4936 4937 4938// Remap a block of memory. 4939char* os::remap_memory(int fd, const char* file_name, size_t file_offset, 4940 char *addr, size_t bytes, bool read_only, 4941 bool allow_exec) { 4942 // same as map_memory() on this OS 4943 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4944 allow_exec); 4945} 4946 4947 4948// Unmap a block of memory. 4949bool os::unmap_memory(char* addr, size_t bytes) { 4950 return munmap(addr, bytes) == 0; 4951} 4952 4953void os::pause() { 4954 char filename[MAX_PATH]; 4955 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4956 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4957 } else { 4958 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4959 } 4960 4961 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4962 if (fd != -1) { 4963 struct stat buf; 4964 close(fd); 4965 while (::stat(filename, &buf) == 0) { 4966 (void)::poll(NULL, 0, 100); 4967 } 4968 } else { 4969 jio_fprintf(stderr, 4970 "Could not open pause file '%s', continuing immediately.\n", filename); 4971 } 4972} 4973 4974#ifndef PRODUCT 4975#ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4976// Turn this on if you need to trace synch operations. 4977// Set RECORD_SYNCH_LIMIT to a large-enough value, 4978// and call record_synch_enable and record_synch_disable 4979// around the computation of interest. 4980 4981void record_synch(char* name, bool returning); // defined below 4982 4983class RecordSynch { 4984 char* _name; 4985 public: 4986 RecordSynch(char* name) :_name(name) 4987 { record_synch(_name, false); } 4988 ~RecordSynch() { record_synch(_name, true); } 4989}; 4990 4991#define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 4992extern "C" ret name params { \ 4993 typedef ret name##_t params; \ 4994 static name##_t* implem = NULL; \ 4995 static int callcount = 0; \ 4996 if (implem == NULL) { \ 4997 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 4998 if (implem == NULL) fatal(dlerror()); \ 4999 } \ 5000 ++callcount; \ 5001 RecordSynch _rs(#name); \ 5002 inner; \ 5003 return implem args; \ 5004} 5005// in dbx, examine callcounts this way: 5006// for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 5007 5008#define CHECK_POINTER_OK(p) \ 5009 (Universe::perm_gen() == NULL || !Universe::is_reserved_heap((oop)(p))) 5010#define CHECK_MU \ 5011 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 5012#define CHECK_CV \ 5013 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 5014#define CHECK_P(p) \ 5015 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 5016 5017#define CHECK_MUTEX(mutex_op) \ 5018CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 5019 5020CHECK_MUTEX( mutex_lock) 5021CHECK_MUTEX( _mutex_lock) 5022CHECK_MUTEX( mutex_unlock) 5023CHECK_MUTEX(_mutex_unlock) 5024CHECK_MUTEX( mutex_trylock) 5025CHECK_MUTEX(_mutex_trylock) 5026 5027#define CHECK_COND(cond_op) \ 5028CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV); 5029 5030CHECK_COND( cond_wait); 5031CHECK_COND(_cond_wait); 5032CHECK_COND(_cond_wait_cancel); 5033 5034#define CHECK_COND2(cond_op) \ 5035CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV); 5036 5037CHECK_COND2( cond_timedwait); 5038CHECK_COND2(_cond_timedwait); 5039CHECK_COND2(_cond_timedwait_cancel); 5040 5041// do the _lwp_* versions too 5042#define mutex_t lwp_mutex_t 5043#define cond_t lwp_cond_t 5044CHECK_MUTEX( _lwp_mutex_lock) 5045CHECK_MUTEX( _lwp_mutex_unlock) 5046CHECK_MUTEX( _lwp_mutex_trylock) 5047CHECK_MUTEX( __lwp_mutex_lock) 5048CHECK_MUTEX( __lwp_mutex_unlock) 5049CHECK_MUTEX( __lwp_mutex_trylock) 5050CHECK_MUTEX(___lwp_mutex_lock) 5051CHECK_MUTEX(___lwp_mutex_unlock) 5052 5053CHECK_COND( _lwp_cond_wait); 5054CHECK_COND( __lwp_cond_wait); 5055CHECK_COND(___lwp_cond_wait); 5056 5057CHECK_COND2( _lwp_cond_timedwait); 5058CHECK_COND2( __lwp_cond_timedwait); 5059#undef mutex_t 5060#undef cond_t 5061 5062CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 5063CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 5064CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 5065CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 5066CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 5067CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 5068CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 5069CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 5070 5071 5072// recording machinery: 5073 5074enum { RECORD_SYNCH_LIMIT = 200 }; 5075char* record_synch_name[RECORD_SYNCH_LIMIT]; 5076void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 5077bool record_synch_returning[RECORD_SYNCH_LIMIT]; 5078thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 5079int record_synch_count = 0; 5080bool record_synch_enabled = false; 5081 5082// in dbx, examine recorded data this way: 5083// for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 5084 5085void record_synch(char* name, bool returning) { 5086 if (record_synch_enabled) { 5087 if (record_synch_count < RECORD_SYNCH_LIMIT) { 5088 record_synch_name[record_synch_count] = name; 5089 record_synch_returning[record_synch_count] = returning; 5090 record_synch_thread[record_synch_count] = thr_self(); 5091 record_synch_arg0ptr[record_synch_count] = &name; 5092 record_synch_count++; 5093 } 5094 // put more checking code here: 5095 // ... 5096 } 5097} 5098 5099void record_synch_enable() { 5100 // start collecting trace data, if not already doing so 5101 if (!record_synch_enabled) record_synch_count = 0; 5102 record_synch_enabled = true; 5103} 5104 5105void record_synch_disable() { 5106 // stop collecting trace data 5107 record_synch_enabled = false; 5108} 5109 5110#endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 5111#endif // PRODUCT 5112 5113const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 5114const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 5115 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 5116 5117 5118// JVMTI & JVM monitoring and management support 5119// The thread_cpu_time() and current_thread_cpu_time() are only 5120// supported if is_thread_cpu_time_supported() returns true. 5121// They are not supported on Solaris T1. 5122 5123// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 5124// are used by JVM M&M and JVMTI to get user+sys or user CPU time 5125// of a thread. 5126// 5127// current_thread_cpu_time() and thread_cpu_time(Thread *) 5128// returns the fast estimate available on the platform. 5129 5130// hrtime_t gethrvtime() return value includes 5131// user time but does not include system time 5132jlong os::current_thread_cpu_time() { 5133 return (jlong) gethrvtime(); 5134} 5135 5136jlong os::thread_cpu_time(Thread *thread) { 5137 // return user level CPU time only to be consistent with 5138 // what current_thread_cpu_time returns. 5139 // thread_cpu_time_info() must be changed if this changes 5140 return os::thread_cpu_time(thread, false /* user time only */); 5141} 5142 5143jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 5144 if (user_sys_cpu_time) { 5145 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 5146 } else { 5147 return os::current_thread_cpu_time(); 5148 } 5149} 5150 5151jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 5152 char proc_name[64]; 5153 int count; 5154 prusage_t prusage; 5155 jlong lwp_time; 5156 int fd; 5157 5158 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 5159 getpid(), 5160 thread->osthread()->lwp_id()); 5161 fd = open(proc_name, O_RDONLY); 5162 if ( fd == -1 ) return -1; 5163 5164 do { 5165 count = pread(fd, 5166 (void *)&prusage.pr_utime, 5167 thr_time_size, 5168 thr_time_off); 5169 } while (count < 0 && errno == EINTR); 5170 close(fd); 5171 if ( count < 0 ) return -1; 5172 5173 if (user_sys_cpu_time) { 5174 // user + system CPU time 5175 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 5176 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 5177 (jlong)prusage.pr_stime.tv_nsec + 5178 (jlong)prusage.pr_utime.tv_nsec; 5179 } else { 5180 // user level CPU time only 5181 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 5182 (jlong)prusage.pr_utime.tv_nsec; 5183 } 5184 5185 return(lwp_time); 5186} 5187 5188void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5189 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5190 info_ptr->may_skip_backward = false; // elapsed time not wall time 5191 info_ptr->may_skip_forward = false; // elapsed time not wall time 5192 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5193} 5194 5195void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5196 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5197 info_ptr->may_skip_backward = false; // elapsed time not wall time 5198 info_ptr->may_skip_forward = false; // elapsed time not wall time 5199 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5200} 5201 5202bool os::is_thread_cpu_time_supported() { 5203 if ( os::Solaris::T2_libthread() || UseBoundThreads ) { 5204 return true; 5205 } else { 5206 return false; 5207 } 5208} 5209 5210// System loadavg support. Returns -1 if load average cannot be obtained. 5211// Return the load average for our processor set if the primitive exists 5212// (Solaris 9 and later). Otherwise just return system wide loadavg. 5213int os::loadavg(double loadavg[], int nelem) { 5214 if (pset_getloadavg_ptr != NULL) { 5215 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 5216 } else { 5217 return ::getloadavg(loadavg, nelem); 5218 } 5219} 5220 5221//--------------------------------------------------------------------------------- 5222#ifndef PRODUCT 5223 5224static address same_page(address x, address y) { 5225 intptr_t page_bits = -os::vm_page_size(); 5226 if ((intptr_t(x) & page_bits) == (intptr_t(y) & page_bits)) 5227 return x; 5228 else if (x > y) 5229 return (address)(intptr_t(y) | ~page_bits) + 1; 5230 else 5231 return (address)(intptr_t(y) & page_bits); 5232} 5233 5234bool os::find(address addr) { 5235 Dl_info dlinfo; 5236 memset(&dlinfo, 0, sizeof(dlinfo)); 5237 if (dladdr(addr, &dlinfo)) { 5238#ifdef _LP64 5239 tty->print("0x%016lx: ", addr); 5240#else 5241 tty->print("0x%08x: ", addr); 5242#endif 5243 if (dlinfo.dli_sname != NULL) 5244 tty->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 5245 else if (dlinfo.dli_fname) 5246 tty->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 5247 else 5248 tty->print("<absolute address>"); 5249 if (dlinfo.dli_fname) tty->print(" in %s", dlinfo.dli_fname); 5250#ifdef _LP64 5251 if (dlinfo.dli_fbase) tty->print(" at 0x%016lx", dlinfo.dli_fbase); 5252#else 5253 if (dlinfo.dli_fbase) tty->print(" at 0x%08x", dlinfo.dli_fbase); 5254#endif 5255 tty->cr(); 5256 5257 if (Verbose) { 5258 // decode some bytes around the PC 5259 address begin = same_page(addr-40, addr); 5260 address end = same_page(addr+40, addr); 5261 address lowest = (address) dlinfo.dli_sname; 5262 if (!lowest) lowest = (address) dlinfo.dli_fbase; 5263 if (begin < lowest) begin = lowest; 5264 Dl_info dlinfo2; 5265 if (dladdr(end, &dlinfo2) && dlinfo2.dli_saddr != dlinfo.dli_saddr 5266 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) 5267 end = (address) dlinfo2.dli_saddr; 5268 Disassembler::decode(begin, end); 5269 } 5270 return true; 5271 } 5272 return false; 5273} 5274 5275#endif 5276 5277 5278// Following function has been added to support HotSparc's libjvm.so running 5279// under Solaris production JDK 1.2.2 / 1.3.0. These came from 5280// src/solaris/hpi/native_threads in the EVM codebase. 5281// 5282// NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 5283// libraries and should thus be removed. We will leave it behind for a while 5284// until we no longer want to able to run on top of 1.3.0 Solaris production 5285// JDK. See 4341971. 5286 5287#define STACK_SLACK 0x800 5288 5289extern "C" { 5290 intptr_t sysThreadAvailableStackWithSlack() { 5291 stack_t st; 5292 intptr_t retval, stack_top; 5293 retval = thr_stksegment(&st); 5294 assert(retval == 0, "incorrect return value from thr_stksegment"); 5295 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 5296 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 5297 stack_top=(intptr_t)st.ss_sp-st.ss_size; 5298 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 5299 } 5300} 5301 5302// Just to get the Kernel build to link on solaris for testing. 5303 5304extern "C" { 5305class ASGCT_CallTrace; 5306void AsyncGetCallTrace(ASGCT_CallTrace *trace, jint depth, void* ucontext) 5307 KERNEL_RETURN; 5308} 5309 5310 5311// ObjectMonitor park-unpark infrastructure ... 5312// 5313// We implement Solaris and Linux PlatformEvents with the 5314// obvious condvar-mutex-flag triple. 5315// Another alternative that works quite well is pipes: 5316// Each PlatformEvent consists of a pipe-pair. 5317// The thread associated with the PlatformEvent 5318// calls park(), which reads from the input end of the pipe. 5319// Unpark() writes into the other end of the pipe. 5320// The write-side of the pipe must be set NDELAY. 5321// Unfortunately pipes consume a large # of handles. 5322// Native solaris lwp_park() and lwp_unpark() work nicely, too. 5323// Using pipes for the 1st few threads might be workable, however. 5324// 5325// park() is permitted to return spuriously. 5326// Callers of park() should wrap the call to park() in 5327// an appropriate loop. A litmus test for the correct 5328// usage of park is the following: if park() were modified 5329// to immediately return 0 your code should still work, 5330// albeit degenerating to a spin loop. 5331// 5332// An interesting optimization for park() is to use a trylock() 5333// to attempt to acquire the mutex. If the trylock() fails 5334// then we know that a concurrent unpark() operation is in-progress. 5335// in that case the park() code could simply set _count to 0 5336// and return immediately. The subsequent park() operation *might* 5337// return immediately. That's harmless as the caller of park() is 5338// expected to loop. By using trylock() we will have avoided a 5339// avoided a context switch caused by contention on the per-thread mutex. 5340// 5341// TODO-FIXME: 5342// 1. Reconcile Doug's JSR166 j.u.c park-unpark with the 5343// objectmonitor implementation. 5344// 2. Collapse the JSR166 parker event, and the 5345// objectmonitor ParkEvent into a single "Event" construct. 5346// 3. In park() and unpark() add: 5347// assert (Thread::current() == AssociatedWith). 5348// 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch. 5349// 1-out-of-N park() operations will return immediately. 5350// 5351// _Event transitions in park() 5352// -1 => -1 : illegal 5353// 1 => 0 : pass - return immediately 5354// 0 => -1 : block 5355// 5356// _Event serves as a restricted-range semaphore. 5357// 5358// Another possible encoding of _Event would be with 5359// explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5360// 5361// TODO-FIXME: add DTRACE probes for: 5362// 1. Tx parks 5363// 2. Ty unparks Tx 5364// 3. Tx resumes from park 5365 5366 5367// value determined through experimentation 5368#define ROUNDINGFIX 11 5369 5370// utility to compute the abstime argument to timedwait. 5371// TODO-FIXME: switch from compute_abstime() to unpackTime(). 5372 5373static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 5374 // millis is the relative timeout time 5375 // abstime will be the absolute timeout time 5376 if (millis < 0) millis = 0; 5377 struct timeval now; 5378 int status = gettimeofday(&now, NULL); 5379 assert(status == 0, "gettimeofday"); 5380 jlong seconds = millis / 1000; 5381 jlong max_wait_period; 5382 5383 if (UseLWPSynchronization) { 5384 // forward port of fix for 4275818 (not sleeping long enough) 5385 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 5386 // _lwp_cond_timedwait() used a round_down algorithm rather 5387 // than a round_up. For millis less than our roundfactor 5388 // it rounded down to 0 which doesn't meet the spec. 5389 // For millis > roundfactor we may return a bit sooner, but 5390 // since we can not accurately identify the patch level and 5391 // this has already been fixed in Solaris 9 and 8 we will 5392 // leave it alone rather than always rounding down. 5393 5394 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 5395 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 5396 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 5397 max_wait_period = 21000000; 5398 } else { 5399 max_wait_period = 50000000; 5400 } 5401 millis %= 1000; 5402 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 5403 seconds = max_wait_period; 5404 } 5405 abstime->tv_sec = now.tv_sec + seconds; 5406 long usec = now.tv_usec + millis * 1000; 5407 if (usec >= 1000000) { 5408 abstime->tv_sec += 1; 5409 usec -= 1000000; 5410 } 5411 abstime->tv_nsec = usec * 1000; 5412 return abstime; 5413} 5414 5415// Test-and-clear _Event, always leaves _Event set to 0, returns immediately. 5416// Conceptually TryPark() should be equivalent to park(0). 5417 5418int os::PlatformEvent::TryPark() { 5419 for (;;) { 5420 const int v = _Event ; 5421 guarantee ((v == 0) || (v == 1), "invariant") ; 5422 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; 5423 } 5424} 5425 5426void os::PlatformEvent::park() { // AKA: down() 5427 // Invariant: Only the thread associated with the Event/PlatformEvent 5428 // may call park(). 5429 int v ; 5430 for (;;) { 5431 v = _Event ; 5432 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 5433 } 5434 guarantee (v >= 0, "invariant") ; 5435 if (v == 0) { 5436 // Do this the hard way by blocking ... 5437 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5438 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 5439 // Only for SPARC >= V8PlusA 5440#if defined(__sparc) && defined(COMPILER2) 5441 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 5442#endif 5443 int status = os::Solaris::mutex_lock(_mutex); 5444 assert_status(status == 0, status, "mutex_lock"); 5445 guarantee (_nParked == 0, "invariant") ; 5446 ++ _nParked ; 5447 while (_Event < 0) { 5448 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 5449 // Treat this the same as if the wait was interrupted 5450 // With usr/lib/lwp going to kernel, always handle ETIME 5451 status = os::Solaris::cond_wait(_cond, _mutex); 5452 if (status == ETIME) status = EINTR ; 5453 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 5454 } 5455 -- _nParked ; 5456 _Event = 0 ; 5457 status = os::Solaris::mutex_unlock(_mutex); 5458 assert_status(status == 0, status, "mutex_unlock"); 5459 } 5460} 5461 5462int os::PlatformEvent::park(jlong millis) { 5463 guarantee (_nParked == 0, "invariant") ; 5464 int v ; 5465 for (;;) { 5466 v = _Event ; 5467 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 5468 } 5469 guarantee (v >= 0, "invariant") ; 5470 if (v != 0) return OS_OK ; 5471 5472 int ret = OS_TIMEOUT; 5473 timestruc_t abst; 5474 compute_abstime (&abst, millis); 5475 5476 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5477 // For Solaris SPARC set fprs.FEF=0 prior to parking. 5478 // Only for SPARC >= V8PlusA 5479#if defined(__sparc) && defined(COMPILER2) 5480 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 5481#endif 5482 int status = os::Solaris::mutex_lock(_mutex); 5483 assert_status(status == 0, status, "mutex_lock"); 5484 guarantee (_nParked == 0, "invariant") ; 5485 ++ _nParked ; 5486 while (_Event < 0) { 5487 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 5488 assert_status(status == 0 || status == EINTR || 5489 status == ETIME || status == ETIMEDOUT, 5490 status, "cond_timedwait"); 5491 if (!FilterSpuriousWakeups) break ; // previous semantics 5492 if (status == ETIME || status == ETIMEDOUT) break ; 5493 // We consume and ignore EINTR and spurious wakeups. 5494 } 5495 -- _nParked ; 5496 if (_Event >= 0) ret = OS_OK ; 5497 _Event = 0 ; 5498 status = os::Solaris::mutex_unlock(_mutex); 5499 assert_status(status == 0, status, "mutex_unlock"); 5500 return ret; 5501} 5502 5503void os::PlatformEvent::unpark() { 5504 int v, AnyWaiters; 5505 5506 // Increment _Event. 5507 // Another acceptable implementation would be to simply swap 1 5508 // into _Event: 5509 // if (Swap (&_Event, 1) < 0) { 5510 // mutex_lock (_mutex) ; AnyWaiters = nParked; mutex_unlock (_mutex) ; 5511 // if (AnyWaiters) cond_signal (_cond) ; 5512 // } 5513 5514 for (;;) { 5515 v = _Event ; 5516 if (v > 0) { 5517 // The LD of _Event could have reordered or be satisfied 5518 // by a read-aside from this processor's write buffer. 5519 // To avoid problems execute a barrier and then 5520 // ratify the value. A degenerate CAS() would also work. 5521 // Viz., CAS (v+0, &_Event, v) == v). 5522 OrderAccess::fence() ; 5523 if (_Event == v) return ; 5524 continue ; 5525 } 5526 if (Atomic::cmpxchg (v+1, &_Event, v) == v) break ; 5527 } 5528 5529 // If the thread associated with the event was parked, wake it. 5530 if (v < 0) { 5531 int status ; 5532 // Wait for the thread assoc with the PlatformEvent to vacate. 5533 status = os::Solaris::mutex_lock(_mutex); 5534 assert_status(status == 0, status, "mutex_lock"); 5535 AnyWaiters = _nParked ; 5536 status = os::Solaris::mutex_unlock(_mutex); 5537 assert_status(status == 0, status, "mutex_unlock"); 5538 guarantee (AnyWaiters == 0 || AnyWaiters == 1, "invariant") ; 5539 if (AnyWaiters != 0) { 5540 // We intentional signal *after* dropping the lock 5541 // to avoid a common class of futile wakeups. 5542 status = os::Solaris::cond_signal(_cond); 5543 assert_status(status == 0, status, "cond_signal"); 5544 } 5545 } 5546} 5547 5548// JSR166 5549// ------------------------------------------------------- 5550 5551/* 5552 * The solaris and linux implementations of park/unpark are fairly 5553 * conservative for now, but can be improved. They currently use a 5554 * mutex/condvar pair, plus _counter. 5555 * Park decrements _counter if > 0, else does a condvar wait. Unpark 5556 * sets count to 1 and signals condvar. Only one thread ever waits 5557 * on the condvar. Contention seen when trying to park implies that someone 5558 * is unparking you, so don't wait. And spurious returns are fine, so there 5559 * is no need to track notifications. 5560 */ 5561 5562#define NANOSECS_PER_SEC 1000000000 5563#define NANOSECS_PER_MILLISEC 1000000 5564#define MAX_SECS 100000000 5565 5566/* 5567 * This code is common to linux and solaris and will be moved to a 5568 * common place in dolphin. 5569 * 5570 * The passed in time value is either a relative time in nanoseconds 5571 * or an absolute time in milliseconds. Either way it has to be unpacked 5572 * into suitable seconds and nanoseconds components and stored in the 5573 * given timespec structure. 5574 * Given time is a 64-bit value and the time_t used in the timespec is only 5575 * a signed-32-bit value (except on 64-bit Linux) we have to watch for 5576 * overflow if times way in the future are given. Further on Solaris versions 5577 * prior to 10 there is a restriction (see cond_timedwait) that the specified 5578 * number of seconds, in abstime, is less than current_time + 100,000,000. 5579 * As it will be 28 years before "now + 100000000" will overflow we can 5580 * ignore overflow and just impose a hard-limit on seconds using the value 5581 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 5582 * years from "now". 5583 */ 5584static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 5585 assert (time > 0, "convertTime"); 5586 5587 struct timeval now; 5588 int status = gettimeofday(&now, NULL); 5589 assert(status == 0, "gettimeofday"); 5590 5591 time_t max_secs = now.tv_sec + MAX_SECS; 5592 5593 if (isAbsolute) { 5594 jlong secs = time / 1000; 5595 if (secs > max_secs) { 5596 absTime->tv_sec = max_secs; 5597 } 5598 else { 5599 absTime->tv_sec = secs; 5600 } 5601 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 5602 } 5603 else { 5604 jlong secs = time / NANOSECS_PER_SEC; 5605 if (secs >= MAX_SECS) { 5606 absTime->tv_sec = max_secs; 5607 absTime->tv_nsec = 0; 5608 } 5609 else { 5610 absTime->tv_sec = now.tv_sec + secs; 5611 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 5612 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 5613 absTime->tv_nsec -= NANOSECS_PER_SEC; 5614 ++absTime->tv_sec; // note: this must be <= max_secs 5615 } 5616 } 5617 } 5618 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 5619 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 5620 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 5621 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 5622} 5623 5624void Parker::park(bool isAbsolute, jlong time) { 5625 5626 // Optional fast-path check: 5627 // Return immediately if a permit is available. 5628 if (_counter > 0) { 5629 _counter = 0 ; 5630 return ; 5631 } 5632 5633 // Optional fast-exit: Check interrupt before trying to wait 5634 Thread* thread = Thread::current(); 5635 assert(thread->is_Java_thread(), "Must be JavaThread"); 5636 JavaThread *jt = (JavaThread *)thread; 5637 if (Thread::is_interrupted(thread, false)) { 5638 return; 5639 } 5640 5641 // First, demultiplex/decode time arguments 5642 timespec absTime; 5643 if (time < 0) { // don't wait at all 5644 return; 5645 } 5646 if (time > 0) { 5647 // Warning: this code might be exposed to the old Solaris time 5648 // round-down bugs. Grep "roundingFix" for details. 5649 unpackTime(&absTime, isAbsolute, time); 5650 } 5651 5652 // Enter safepoint region 5653 // Beware of deadlocks such as 6317397. 5654 // The per-thread Parker:: _mutex is a classic leaf-lock. 5655 // In particular a thread must never block on the Threads_lock while 5656 // holding the Parker:: mutex. If safepoints are pending both the 5657 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 5658 ThreadBlockInVM tbivm(jt); 5659 5660 // Don't wait if cannot get lock since interference arises from 5661 // unblocking. Also. check interrupt before trying wait 5662 if (Thread::is_interrupted(thread, false) || 5663 os::Solaris::mutex_trylock(_mutex) != 0) { 5664 return; 5665 } 5666 5667 int status ; 5668 5669 if (_counter > 0) { // no wait needed 5670 _counter = 0; 5671 status = os::Solaris::mutex_unlock(_mutex); 5672 assert (status == 0, "invariant") ; 5673 return; 5674 } 5675 5676#ifdef ASSERT 5677 // Don't catch signals while blocked; let the running threads have the signals. 5678 // (This allows a debugger to break into the running thread.) 5679 sigset_t oldsigs; 5680 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals(); 5681 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 5682#endif 5683 5684 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5685 jt->set_suspend_equivalent(); 5686 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 5687 5688 // Do this the hard way by blocking ... 5689 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5690 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 5691 // Only for SPARC >= V8PlusA 5692#if defined(__sparc) && defined(COMPILER2) 5693 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 5694#endif 5695 5696 if (time == 0) { 5697 status = os::Solaris::cond_wait (_cond, _mutex) ; 5698 } else { 5699 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 5700 } 5701 // Note that an untimed cond_wait() can sometimes return ETIME on older 5702 // versions of the Solaris. 5703 assert_status(status == 0 || status == EINTR || 5704 status == ETIME || status == ETIMEDOUT, 5705 status, "cond_timedwait"); 5706 5707#ifdef ASSERT 5708 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL); 5709#endif 5710 _counter = 0 ; 5711 status = os::Solaris::mutex_unlock(_mutex); 5712 assert_status(status == 0, status, "mutex_unlock") ; 5713 5714 // If externally suspended while waiting, re-suspend 5715 if (jt->handle_special_suspend_equivalent_condition()) { 5716 jt->java_suspend_self(); 5717 } 5718 5719} 5720 5721void Parker::unpark() { 5722 int s, status ; 5723 status = os::Solaris::mutex_lock (_mutex) ; 5724 assert (status == 0, "invariant") ; 5725 s = _counter; 5726 _counter = 1; 5727 status = os::Solaris::mutex_unlock (_mutex) ; 5728 assert (status == 0, "invariant") ; 5729 5730 if (s < 1) { 5731 status = os::Solaris::cond_signal (_cond) ; 5732 assert (status == 0, "invariant") ; 5733 } 5734} 5735 5736extern char** environ; 5737 5738// Run the specified command in a separate process. Return its exit value, 5739// or -1 on failure (e.g. can't fork a new process). 5740// Unlike system(), this function can be called from signal handler. It 5741// doesn't block SIGINT et al. 5742int os::fork_and_exec(char* cmd) { 5743 char * argv[4]; 5744 argv[0] = (char *)"sh"; 5745 argv[1] = (char *)"-c"; 5746 argv[2] = cmd; 5747 argv[3] = NULL; 5748 5749 // fork is async-safe, fork1 is not so can't use in signal handler 5750 pid_t pid; 5751 Thread* t = ThreadLocalStorage::get_thread_slow(); 5752 if (t != NULL && t->is_inside_signal_handler()) { 5753 pid = fork(); 5754 } else { 5755 pid = fork1(); 5756 } 5757 5758 if (pid < 0) { 5759 // fork failed 5760 warning("fork failed: %s", strerror(errno)); 5761 return -1; 5762 5763 } else if (pid == 0) { 5764 // child process 5765 5766 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 5767 execve("/usr/bin/sh", argv, environ); 5768 5769 // execve failed 5770 _exit(-1); 5771 5772 } else { 5773 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 5774 // care about the actual exit code, for now. 5775 5776 int status; 5777 5778 // Wait for the child process to exit. This returns immediately if 5779 // the child has already exited. */ 5780 while (waitpid(pid, &status, 0) < 0) { 5781 switch (errno) { 5782 case ECHILD: return 0; 5783 case EINTR: break; 5784 default: return -1; 5785 } 5786 } 5787 5788 if (WIFEXITED(status)) { 5789 // The child exited normally; get its exit code. 5790 return WEXITSTATUS(status); 5791 } else if (WIFSIGNALED(status)) { 5792 // The child exited because of a signal 5793 // The best value to return is 0x80 + signal number, 5794 // because that is what all Unix shells do, and because 5795 // it allows callers to distinguish between process exit and 5796 // process death by signal. 5797 return 0x80 + WTERMSIG(status); 5798 } else { 5799 // Unknown exit code; pass it through 5800 return status; 5801 } 5802 } 5803} 5804