Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.cpp @ 989:148e5441d916
6863023: need non-perm oops in code cache for JSR 292
Summary: Make a special root-list for those few nmethods which might contain non-perm oops.
Reviewed-by: twisti, kvn, never, jmasa, ysr
| author | jrose |
|---|---|
| date | Tue, 15 Sep 2009 21:53:47 -0700 |
| parents | bd02caa94611 |
| children | 46b819ba120b |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 844 | 2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved. |
| 0 | 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 # include "incls/_precompiled.incl" | |
| 26 # include "incls/_thread.cpp.incl" | |
| 27 | |
| 28 #ifdef DTRACE_ENABLED | |
| 29 | |
| 30 // Only bother with this argument setup if dtrace is available | |
| 31 | |
| 32 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); | |
| 33 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
| 34 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
| 35 intptr_t, intptr_t, bool); | |
| 36 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
| 37 intptr_t, intptr_t, bool); | |
| 38 | |
| 39 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
| 40 { \ | |
| 41 ResourceMark rm(this); \ | |
| 42 int len = 0; \ | |
| 43 const char* name = (javathread)->get_thread_name(); \ | |
| 44 len = strlen(name); \ | |
| 45 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
| 46 name, len, \ | |
| 47 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
| 48 (javathread)->osthread()->thread_id(), \ | |
| 49 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
| 50 } | |
| 51 | |
| 52 #else // ndef DTRACE_ENABLED | |
| 53 | |
| 54 #define DTRACE_THREAD_PROBE(probe, javathread) | |
| 55 | |
| 56 #endif // ndef DTRACE_ENABLED | |
| 57 | |
| 58 // Class hierarchy | |
| 59 // - Thread | |
| 60 // - VMThread | |
| 61 // - WatcherThread | |
| 62 // - ConcurrentMarkSweepThread | |
| 63 // - JavaThread | |
| 64 // - CompilerThread | |
| 65 | |
| 66 // ======= Thread ======== | |
| 67 | |
| 68 // Support for forcing alignment of thread objects for biased locking | |
| 69 void* Thread::operator new(size_t size) { | |
| 70 if (UseBiasedLocking) { | |
| 71 const int alignment = markOopDesc::biased_lock_alignment; | |
| 72 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
| 73 void* real_malloc_addr = CHeapObj::operator new(aligned_size); | |
| 74 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); | |
| 75 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
| 76 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
| 77 "JavaThread alignment code overflowed allocated storage"); | |
| 78 if (TraceBiasedLocking) { | |
| 79 if (aligned_addr != real_malloc_addr) | |
| 80 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
| 81 real_malloc_addr, aligned_addr); | |
| 82 } | |
| 83 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
| 84 return aligned_addr; | |
| 85 } else { | |
| 86 return CHeapObj::operator new(size); | |
| 87 } | |
| 88 } | |
| 89 | |
| 90 void Thread::operator delete(void* p) { | |
| 91 if (UseBiasedLocking) { | |
| 92 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
| 93 CHeapObj::operator delete(real_malloc_addr); | |
| 94 } else { | |
| 95 CHeapObj::operator delete(p); | |
| 96 } | |
| 97 } | |
| 98 | |
| 99 | |
| 100 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
| 101 // JavaThread | |
| 102 | |
| 103 | |
| 104 Thread::Thread() { | |
| 105 // stack | |
| 106 _stack_base = NULL; | |
| 107 _stack_size = 0; | |
| 108 _self_raw_id = 0; | |
| 109 _lgrp_id = -1; | |
| 110 _osthread = NULL; | |
| 111 | |
| 112 // allocated data structures | |
| 113 set_resource_area(new ResourceArea()); | |
| 114 set_handle_area(new HandleArea(NULL)); | |
| 115 set_active_handles(NULL); | |
| 116 set_free_handle_block(NULL); | |
| 117 set_last_handle_mark(NULL); | |
| 118 set_osthread(NULL); | |
| 119 | |
| 120 // This initial value ==> never claimed. | |
| 121 _oops_do_parity = 0; | |
| 122 | |
| 123 // the handle mark links itself to last_handle_mark | |
| 124 new HandleMark(this); | |
| 125 | |
| 126 // plain initialization | |
| 127 debug_only(_owned_locks = NULL;) | |
| 128 debug_only(_allow_allocation_count = 0;) | |
| 129 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
|
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821269eca479
6820167: GCALotAtAllSafepoints + FullGCALot(ScavengeALot) options crash JVM
ysr
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diff
changeset
|
130 NOT_PRODUCT(_skip_gcalot = false;) |
| 0 | 131 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
| 132 _jvmti_env_iteration_count = 0; | |
| 133 _vm_operation_started_count = 0; | |
| 134 _vm_operation_completed_count = 0; | |
| 135 _current_pending_monitor = NULL; | |
| 136 _current_pending_monitor_is_from_java = true; | |
| 137 _current_waiting_monitor = NULL; | |
| 138 _num_nested_signal = 0; | |
| 139 omFreeList = NULL ; | |
| 140 omFreeCount = 0 ; | |
| 141 omFreeProvision = 32 ; | |
| 142 | |
| 143 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); | |
| 144 _suspend_flags = 0; | |
| 145 | |
| 146 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
| 147 _hashStateX = os::random() ; | |
| 148 _hashStateY = 842502087 ; | |
| 149 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
| 150 _hashStateW = 273326509 ; | |
| 151 | |
| 152 _OnTrap = 0 ; | |
| 153 _schedctl = NULL ; | |
| 154 _Stalled = 0 ; | |
| 155 _TypeTag = 0x2BAD ; | |
| 156 | |
| 157 // Many of the following fields are effectively final - immutable | |
| 158 // Note that nascent threads can't use the Native Monitor-Mutex | |
| 159 // construct until the _MutexEvent is initialized ... | |
| 160 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
| 161 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
| 162 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
| 163 // and ::Release() | |
| 164 _ParkEvent = ParkEvent::Allocate (this) ; | |
| 165 _SleepEvent = ParkEvent::Allocate (this) ; | |
| 166 _MutexEvent = ParkEvent::Allocate (this) ; | |
| 167 _MuxEvent = ParkEvent::Allocate (this) ; | |
| 168 | |
| 169 #ifdef CHECK_UNHANDLED_OOPS | |
| 170 if (CheckUnhandledOops) { | |
| 171 _unhandled_oops = new UnhandledOops(this); | |
| 172 } | |
| 173 #endif // CHECK_UNHANDLED_OOPS | |
| 174 #ifdef ASSERT | |
| 175 if (UseBiasedLocking) { | |
| 176 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
| 177 assert(this == _real_malloc_address || | |
| 178 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
| 179 "bug in forced alignment of thread objects"); | |
| 180 } | |
| 181 #endif /* ASSERT */ | |
| 182 } | |
| 183 | |
| 184 void Thread::initialize_thread_local_storage() { | |
| 185 // Note: Make sure this method only calls | |
| 186 // non-blocking operations. Otherwise, it might not work | |
| 187 // with the thread-startup/safepoint interaction. | |
| 188 | |
| 189 // During Java thread startup, safepoint code should allow this | |
| 190 // method to complete because it may need to allocate memory to | |
| 191 // store information for the new thread. | |
| 192 | |
| 193 // initialize structure dependent on thread local storage | |
| 194 ThreadLocalStorage::set_thread(this); | |
| 195 | |
| 196 // set up any platform-specific state. | |
| 197 os::initialize_thread(); | |
| 198 | |
| 199 } | |
| 200 | |
| 201 void Thread::record_stack_base_and_size() { | |
| 202 set_stack_base(os::current_stack_base()); | |
| 203 set_stack_size(os::current_stack_size()); | |
| 204 } | |
| 205 | |
| 206 | |
| 207 Thread::~Thread() { | |
| 208 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
| 209 ObjectSynchronizer::omFlush (this) ; | |
| 210 | |
| 211 // deallocate data structures | |
| 212 delete resource_area(); | |
| 213 // since the handle marks are using the handle area, we have to deallocated the root | |
| 214 // handle mark before deallocating the thread's handle area, | |
| 215 assert(last_handle_mark() != NULL, "check we have an element"); | |
| 216 delete last_handle_mark(); | |
| 217 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
| 218 | |
| 219 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
| 220 // We NULL out the fields for good hygiene. | |
| 221 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
| 222 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
| 223 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
| 224 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
| 225 | |
| 226 delete handle_area(); | |
| 227 | |
| 228 // osthread() can be NULL, if creation of thread failed. | |
| 229 if (osthread() != NULL) os::free_thread(osthread()); | |
| 230 | |
| 231 delete _SR_lock; | |
| 232 | |
| 233 // clear thread local storage if the Thread is deleting itself | |
| 234 if (this == Thread::current()) { | |
| 235 ThreadLocalStorage::set_thread(NULL); | |
| 236 } else { | |
| 237 // In the case where we're not the current thread, invalidate all the | |
| 238 // caches in case some code tries to get the current thread or the | |
| 239 // thread that was destroyed, and gets stale information. | |
| 240 ThreadLocalStorage::invalidate_all(); | |
| 241 } | |
| 242 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
| 243 } | |
| 244 | |
| 245 // NOTE: dummy function for assertion purpose. | |
| 246 void Thread::run() { | |
| 247 ShouldNotReachHere(); | |
| 248 } | |
| 249 | |
| 250 #ifdef ASSERT | |
| 251 // Private method to check for dangling thread pointer | |
| 252 void check_for_dangling_thread_pointer(Thread *thread) { | |
| 253 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
| 254 "possibility of dangling Thread pointer"); | |
| 255 } | |
| 256 #endif | |
| 257 | |
| 258 | |
| 259 #ifndef PRODUCT | |
| 260 // Tracing method for basic thread operations | |
| 261 void Thread::trace(const char* msg, const Thread* const thread) { | |
| 262 if (!TraceThreadEvents) return; | |
| 263 ResourceMark rm; | |
| 264 ThreadCritical tc; | |
| 265 const char *name = "non-Java thread"; | |
| 266 int prio = -1; | |
| 267 if (thread->is_Java_thread() | |
| 268 && !thread->is_Compiler_thread()) { | |
| 269 // The Threads_lock must be held to get information about | |
| 270 // this thread but may not be in some situations when | |
| 271 // tracing thread events. | |
| 272 bool release_Threads_lock = false; | |
| 273 if (!Threads_lock->owned_by_self()) { | |
| 274 Threads_lock->lock(); | |
| 275 release_Threads_lock = true; | |
| 276 } | |
| 277 JavaThread* jt = (JavaThread *)thread; | |
| 278 name = (char *)jt->get_thread_name(); | |
| 279 oop thread_oop = jt->threadObj(); | |
| 280 if (thread_oop != NULL) { | |
| 281 prio = java_lang_Thread::priority(thread_oop); | |
| 282 } | |
| 283 if (release_Threads_lock) { | |
| 284 Threads_lock->unlock(); | |
| 285 } | |
| 286 } | |
| 287 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
| 288 } | |
| 289 #endif | |
| 290 | |
| 291 | |
| 292 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
| 293 trace("get priority", thread); | |
| 294 ThreadPriority priority; | |
| 295 // Can return an error! | |
| 296 (void)os::get_priority(thread, priority); | |
| 297 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
| 298 return priority; | |
| 299 } | |
| 300 | |
| 301 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
| 302 trace("set priority", thread); | |
| 303 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 304 // Can return an error! | |
| 305 (void)os::set_priority(thread, priority); | |
| 306 } | |
| 307 | |
| 308 | |
| 309 void Thread::start(Thread* thread) { | |
| 310 trace("start", thread); | |
| 311 // Start is different from resume in that its safety is guaranteed by context or | |
| 312 // being called from a Java method synchronized on the Thread object. | |
| 313 if (!DisableStartThread) { | |
| 314 if (thread->is_Java_thread()) { | |
| 315 // Initialize the thread state to RUNNABLE before starting this thread. | |
| 316 // Can not set it after the thread started because we do not know the | |
| 317 // exact thread state at that time. It could be in MONITOR_WAIT or | |
| 318 // in SLEEPING or some other state. | |
| 319 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
| 320 java_lang_Thread::RUNNABLE); | |
| 321 } | |
| 322 os::start_thread(thread); | |
| 323 } | |
| 324 } | |
| 325 | |
| 326 // Enqueue a VM_Operation to do the job for us - sometime later | |
| 327 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
| 328 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
| 329 VMThread::execute(vm_stop); | |
| 330 } | |
| 331 | |
| 332 | |
| 333 // | |
| 334 // Check if an external suspend request has completed (or has been | |
| 335 // cancelled). Returns true if the thread is externally suspended and | |
| 336 // false otherwise. | |
| 337 // | |
| 338 // The bits parameter returns information about the code path through | |
| 339 // the routine. Useful for debugging: | |
| 340 // | |
| 341 // set in is_ext_suspend_completed(): | |
| 342 // 0x00000001 - routine was entered | |
| 343 // 0x00000010 - routine return false at end | |
| 344 // 0x00000100 - thread exited (return false) | |
| 345 // 0x00000200 - suspend request cancelled (return false) | |
| 346 // 0x00000400 - thread suspended (return true) | |
| 347 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
| 348 // 0x00002000 - thread is native and walkable (return true) | |
| 349 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
| 350 // | |
| 351 // set in wait_for_ext_suspend_completion(): | |
| 352 // 0x00010000 - routine was entered | |
| 353 // 0x00020000 - suspend request cancelled before loop (return false) | |
| 354 // 0x00040000 - thread suspended before loop (return true) | |
| 355 // 0x00080000 - suspend request cancelled in loop (return false) | |
| 356 // 0x00100000 - thread suspended in loop (return true) | |
| 357 // 0x00200000 - suspend not completed during retry loop (return false) | |
| 358 // | |
| 359 | |
| 360 // Helper class for tracing suspend wait debug bits. | |
| 361 // | |
| 362 // 0x00000100 indicates that the target thread exited before it could | |
| 363 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
| 364 // 0x00080000 each indicate a cancelled suspend request so they don't | |
| 365 // count as wait failures either. | |
| 366 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
| 367 | |
| 368 class TraceSuspendDebugBits : public StackObj { | |
| 369 private: | |
| 370 JavaThread * jt; | |
| 371 bool is_wait; | |
| 372 bool called_by_wait; // meaningful when !is_wait | |
| 373 uint32_t * bits; | |
| 374 | |
| 375 public: | |
| 376 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
| 377 uint32_t *_bits) { | |
| 378 jt = _jt; | |
| 379 is_wait = _is_wait; | |
| 380 called_by_wait = _called_by_wait; | |
| 381 bits = _bits; | |
| 382 } | |
| 383 | |
| 384 ~TraceSuspendDebugBits() { | |
| 385 if (!is_wait) { | |
| 386 #if 1 | |
| 387 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
| 388 // That trace is very chatty. | |
| 389 return; | |
| 390 #else | |
| 391 if (!called_by_wait) { | |
| 392 // If tracing for is_ext_suspend_completed() is enabled, then only | |
| 393 // trace calls to it from wait_for_ext_suspend_completion() | |
| 394 return; | |
| 395 } | |
| 396 #endif | |
| 397 } | |
| 398 | |
| 399 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
| 400 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
| 401 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
| 402 ResourceMark rm; | |
| 403 | |
| 404 tty->print_cr( | |
| 405 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
| 406 jt->get_thread_name(), *bits); | |
| 407 | |
| 408 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
| 409 } | |
| 410 } | |
| 411 } | |
| 412 }; | |
| 413 #undef DEBUG_FALSE_BITS | |
| 414 | |
| 415 | |
| 416 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
| 417 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
| 418 | |
| 419 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
| 420 bool do_trans_retry; // flag to force the retry | |
| 421 | |
| 422 *bits |= 0x00000001; | |
| 423 | |
| 424 do { | |
| 425 do_trans_retry = false; | |
| 426 | |
| 427 if (is_exiting()) { | |
| 428 // Thread is in the process of exiting. This is always checked | |
| 429 // first to reduce the risk of dereferencing a freed JavaThread. | |
| 430 *bits |= 0x00000100; | |
| 431 return false; | |
| 432 } | |
| 433 | |
| 434 if (!is_external_suspend()) { | |
| 435 // Suspend request is cancelled. This is always checked before | |
| 436 // is_ext_suspended() to reduce the risk of a rogue resume | |
| 437 // confusing the thread that made the suspend request. | |
| 438 *bits |= 0x00000200; | |
| 439 return false; | |
| 440 } | |
| 441 | |
| 442 if (is_ext_suspended()) { | |
| 443 // thread is suspended | |
| 444 *bits |= 0x00000400; | |
| 445 return true; | |
| 446 } | |
| 447 | |
| 448 // Now that we no longer do hard suspends of threads running | |
| 449 // native code, the target thread can be changing thread state | |
| 450 // while we are in this routine: | |
| 451 // | |
| 452 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
| 453 // | |
| 454 // We save a copy of the thread state as observed at this moment | |
| 455 // and make our decision about suspend completeness based on the | |
| 456 // copy. This closes the race where the thread state is seen as | |
| 457 // _thread_in_native_trans in the if-thread_blocked check, but is | |
| 458 // seen as _thread_blocked in if-thread_in_native_trans check. | |
| 459 JavaThreadState save_state = thread_state(); | |
| 460 | |
| 461 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
| 462 // If the thread's state is _thread_blocked and this blocking | |
| 463 // condition is known to be equivalent to a suspend, then we can | |
| 464 // consider the thread to be externally suspended. This means that | |
| 465 // the code that sets _thread_blocked has been modified to do | |
| 466 // self-suspension if the blocking condition releases. We also | |
| 467 // used to check for CONDVAR_WAIT here, but that is now covered by | |
| 468 // the _thread_blocked with self-suspension check. | |
| 469 // | |
| 470 // Return true since we wouldn't be here unless there was still an | |
| 471 // external suspend request. | |
| 472 *bits |= 0x00001000; | |
| 473 return true; | |
| 474 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
| 475 // Threads running native code will self-suspend on native==>VM/Java | |
| 476 // transitions. If its stack is walkable (should always be the case | |
| 477 // unless this function is called before the actual java_suspend() | |
| 478 // call), then the wait is done. | |
| 479 *bits |= 0x00002000; | |
| 480 return true; | |
| 481 } else if (!called_by_wait && !did_trans_retry && | |
| 482 save_state == _thread_in_native_trans && | |
| 483 frame_anchor()->walkable()) { | |
| 484 // The thread is transitioning from thread_in_native to another | |
| 485 // thread state. check_safepoint_and_suspend_for_native_trans() | |
| 486 // will force the thread to self-suspend. If it hasn't gotten | |
| 487 // there yet we may have caught the thread in-between the native | |
| 488 // code check above and the self-suspend. Lucky us. If we were | |
| 489 // called by wait_for_ext_suspend_completion(), then it | |
| 490 // will be doing the retries so we don't have to. | |
| 491 // | |
| 492 // Since we use the saved thread state in the if-statement above, | |
| 493 // there is a chance that the thread has already transitioned to | |
| 494 // _thread_blocked by the time we get here. In that case, we will | |
| 495 // make a single unnecessary pass through the logic below. This | |
| 496 // doesn't hurt anything since we still do the trans retry. | |
| 497 | |
| 498 *bits |= 0x00004000; | |
| 499 | |
| 500 // Once the thread leaves thread_in_native_trans for another | |
| 501 // thread state, we break out of this retry loop. We shouldn't | |
| 502 // need this flag to prevent us from getting back here, but | |
| 503 // sometimes paranoia is good. | |
| 504 did_trans_retry = true; | |
| 505 | |
| 506 // We wait for the thread to transition to a more usable state. | |
| 507 for (int i = 1; i <= SuspendRetryCount; i++) { | |
| 508 // We used to do an "os::yield_all(i)" call here with the intention | |
| 509 // that yielding would increase on each retry. However, the parameter | |
| 510 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 511 // on the SR_lock below provides a much more predictable scale up for | |
| 512 // the delay. It also provides a simple/direct point to check for any | |
| 513 // safepoint requests from the VMThread | |
| 514 | |
| 515 // temporarily drops SR_lock while doing wait with safepoint check | |
| 516 // (if we're a JavaThread - the WatcherThread can also call this) | |
| 517 // and increase delay with each retry | |
| 518 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 519 | |
| 520 // check the actual thread state instead of what we saved above | |
| 521 if (thread_state() != _thread_in_native_trans) { | |
| 522 // the thread has transitioned to another thread state so | |
| 523 // try all the checks (except this one) one more time. | |
| 524 do_trans_retry = true; | |
| 525 break; | |
| 526 } | |
| 527 } // end retry loop | |
| 528 | |
| 529 | |
| 530 } | |
| 531 } while (do_trans_retry); | |
| 532 | |
| 533 *bits |= 0x00000010; | |
| 534 return false; | |
| 535 } | |
| 536 | |
| 537 // | |
| 538 // Wait for an external suspend request to complete (or be cancelled). | |
| 539 // Returns true if the thread is externally suspended and false otherwise. | |
| 540 // | |
| 541 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
| 542 uint32_t *bits) { | |
| 543 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
| 544 false /* !called_by_wait */, bits); | |
| 545 | |
| 546 // local flag copies to minimize SR_lock hold time | |
| 547 bool is_suspended; | |
| 548 bool pending; | |
| 549 uint32_t reset_bits; | |
| 550 | |
| 551 // set a marker so is_ext_suspend_completed() knows we are the caller | |
| 552 *bits |= 0x00010000; | |
| 553 | |
| 554 // We use reset_bits to reinitialize the bits value at the top of | |
| 555 // each retry loop. This allows the caller to make use of any | |
| 556 // unused bits for their own marking purposes. | |
| 557 reset_bits = *bits; | |
| 558 | |
| 559 { | |
| 560 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 561 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 562 delay, bits); | |
| 563 pending = is_external_suspend(); | |
| 564 } | |
| 565 // must release SR_lock to allow suspension to complete | |
| 566 | |
| 567 if (!pending) { | |
| 568 // A cancelled suspend request is the only false return from | |
| 569 // is_ext_suspend_completed() that keeps us from entering the | |
| 570 // retry loop. | |
| 571 *bits |= 0x00020000; | |
| 572 return false; | |
| 573 } | |
| 574 | |
| 575 if (is_suspended) { | |
| 576 *bits |= 0x00040000; | |
| 577 return true; | |
| 578 } | |
| 579 | |
| 580 for (int i = 1; i <= retries; i++) { | |
| 581 *bits = reset_bits; // reinit to only track last retry | |
| 582 | |
| 583 // We used to do an "os::yield_all(i)" call here with the intention | |
| 584 // that yielding would increase on each retry. However, the parameter | |
| 585 // is ignored on Linux which means the yield didn't scale up. Waiting | |
| 586 // on the SR_lock below provides a much more predictable scale up for | |
| 587 // the delay. It also provides a simple/direct point to check for any | |
| 588 // safepoint requests from the VMThread | |
| 589 | |
| 590 { | |
| 591 MutexLocker ml(SR_lock()); | |
| 592 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
| 593 // can also call this) and increase delay with each retry | |
| 594 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
| 595 | |
| 596 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
| 597 delay, bits); | |
| 598 | |
| 599 // It is possible for the external suspend request to be cancelled | |
| 600 // (by a resume) before the actual suspend operation is completed. | |
| 601 // Refresh our local copy to see if we still need to wait. | |
| 602 pending = is_external_suspend(); | |
| 603 } | |
| 604 | |
| 605 if (!pending) { | |
| 606 // A cancelled suspend request is the only false return from | |
| 607 // is_ext_suspend_completed() that keeps us from staying in the | |
| 608 // retry loop. | |
| 609 *bits |= 0x00080000; | |
| 610 return false; | |
| 611 } | |
| 612 | |
| 613 if (is_suspended) { | |
| 614 *bits |= 0x00100000; | |
| 615 return true; | |
| 616 } | |
| 617 } // end retry loop | |
| 618 | |
| 619 // thread did not suspend after all our retries | |
| 620 *bits |= 0x00200000; | |
| 621 return false; | |
| 622 } | |
| 623 | |
| 624 #ifndef PRODUCT | |
| 625 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
| 626 | |
| 627 // This should not need to be atomic as the only way for simultaneous | |
| 628 // updates is via interrupts. Even then this should be rare or non-existant | |
| 629 // and we don't care that much anyway. | |
| 630 | |
| 631 int index = _jmp_ring_index; | |
| 632 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
| 633 _jmp_ring[index]._target = (intptr_t) target; | |
| 634 _jmp_ring[index]._instruction = (intptr_t) instr; | |
| 635 _jmp_ring[index]._file = file; | |
| 636 _jmp_ring[index]._line = line; | |
| 637 } | |
| 638 #endif /* PRODUCT */ | |
| 639 | |
| 640 // Called by flat profiler | |
| 641 // Callers have already called wait_for_ext_suspend_completion | |
| 642 // The assertion for that is currently too complex to put here: | |
| 643 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
| 644 bool gotframe = false; | |
| 645 // self suspension saves needed state. | |
| 646 if (has_last_Java_frame() && _anchor.walkable()) { | |
| 647 *_fr = pd_last_frame(); | |
| 648 gotframe = true; | |
| 649 } | |
| 650 return gotframe; | |
| 651 } | |
| 652 | |
| 653 void Thread::interrupt(Thread* thread) { | |
| 654 trace("interrupt", thread); | |
| 655 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 656 os::interrupt(thread); | |
| 657 } | |
| 658 | |
| 659 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
| 660 trace("is_interrupted", thread); | |
| 661 debug_only(check_for_dangling_thread_pointer(thread);) | |
| 662 // Note: If clear_interrupted==false, this simply fetches and | |
| 663 // returns the value of the field osthread()->interrupted(). | |
| 664 return os::is_interrupted(thread, clear_interrupted); | |
| 665 } | |
| 666 | |
| 667 | |
| 668 // GC Support | |
| 669 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
| 670 jint thread_parity = _oops_do_parity; | |
| 671 if (thread_parity != strong_roots_parity) { | |
| 672 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
| 673 if (res == thread_parity) return true; | |
| 674 else { | |
| 675 guarantee(res == strong_roots_parity, "Or else what?"); | |
| 676 assert(SharedHeap::heap()->n_par_threads() > 0, | |
| 677 "Should only fail when parallel."); | |
| 678 return false; | |
| 679 } | |
| 680 } | |
| 681 assert(SharedHeap::heap()->n_par_threads() > 0, | |
| 682 "Should only fail when parallel."); | |
| 683 return false; | |
| 684 } | |
| 685 | |
|
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686 void Thread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 687 active_handles()->oops_do(f); |
| 688 // Do oop for ThreadShadow | |
| 689 f->do_oop((oop*)&_pending_exception); | |
| 690 handle_area()->oops_do(f); | |
| 691 } | |
| 692 | |
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693 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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694 // no nmethods in a generic thread... |
| 0 | 695 } |
| 696 | |
| 697 void Thread::print_on(outputStream* st) const { | |
| 698 // get_priority assumes osthread initialized | |
| 699 if (osthread() != NULL) { | |
| 700 st->print("prio=%d tid=" INTPTR_FORMAT " ", get_priority(this), this); | |
| 701 osthread()->print_on(st); | |
| 702 } | |
| 703 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
| 704 } | |
| 705 | |
| 706 // Thread::print_on_error() is called by fatal error handler. Don't use | |
| 707 // any lock or allocate memory. | |
| 708 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
| 709 if (is_VM_thread()) st->print("VMThread"); | |
| 710 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
| 711 else if (is_Java_thread()) st->print("JavaThread"); | |
| 712 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
| 713 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
| 714 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
| 715 else st->print("Thread"); | |
| 716 | |
| 717 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
| 718 _stack_base - _stack_size, _stack_base); | |
| 719 | |
| 720 if (osthread()) { | |
| 721 st->print(" [id=%d]", osthread()->thread_id()); | |
| 722 } | |
| 723 } | |
| 724 | |
| 725 #ifdef ASSERT | |
| 726 void Thread::print_owned_locks_on(outputStream* st) const { | |
| 727 Monitor *cur = _owned_locks; | |
| 728 if (cur == NULL) { | |
| 729 st->print(" (no locks) "); | |
| 730 } else { | |
| 731 st->print_cr(" Locks owned:"); | |
| 732 while(cur) { | |
| 733 cur->print_on(st); | |
| 734 cur = cur->next(); | |
| 735 } | |
| 736 } | |
| 737 } | |
| 738 | |
| 739 static int ref_use_count = 0; | |
| 740 | |
| 741 bool Thread::owns_locks_but_compiled_lock() const { | |
| 742 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 743 if (cur != Compile_lock) return true; | |
| 744 } | |
| 745 return false; | |
| 746 } | |
| 747 | |
| 748 | |
| 749 #endif | |
| 750 | |
| 751 #ifndef PRODUCT | |
| 752 | |
| 753 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
| 754 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
| 755 // no threads which allow_vm_block's are held | |
| 756 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
| 757 // Check if current thread is allowed to block at a safepoint | |
| 758 if (!(_allow_safepoint_count == 0)) | |
| 759 fatal("Possible safepoint reached by thread that does not allow it"); | |
| 760 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
| 761 fatal("LEAF method calling lock?"); | |
| 762 } | |
| 763 | |
| 764 #ifdef ASSERT | |
| 765 if (potential_vm_operation && is_Java_thread() | |
| 766 && !Universe::is_bootstrapping()) { | |
| 767 // Make sure we do not hold any locks that the VM thread also uses. | |
| 768 // This could potentially lead to deadlocks | |
| 769 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
| 770 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
| 771 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
| 772 // since it is used to transfer control between JavaThreads and the VMThread | |
| 773 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
| 774 if ( (cur->allow_vm_block() && | |
| 775 cur != Threads_lock && | |
| 776 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
| 777 cur != VMOperationRequest_lock && | |
| 778 cur != VMOperationQueue_lock) || | |
| 779 cur->rank() == Mutex::special) { | |
| 780 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
| 781 } | |
| 782 } | |
| 783 } | |
| 784 | |
| 785 if (GCALotAtAllSafepoints) { | |
| 786 // We could enter a safepoint here and thus have a gc | |
| 787 InterfaceSupport::check_gc_alot(); | |
| 788 } | |
| 789 #endif | |
| 790 } | |
| 791 #endif | |
| 792 | |
| 793 bool Thread::is_in_stack(address adr) const { | |
| 794 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
| 795 address end = os::current_stack_pointer(); | |
| 796 if (stack_base() >= adr && adr >= end) return true; | |
| 797 | |
| 798 return false; | |
| 799 } | |
| 800 | |
| 801 | |
| 802 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
| 803 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
| 804 // used for compilation in the future. If that change is made, the need for these methods | |
| 805 // should be revisited, and they should be removed if possible. | |
| 806 | |
| 807 bool Thread::is_lock_owned(address adr) const { | |
|
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808 return (_stack_base >= adr && adr >= (_stack_base - _stack_size)); |
| 0 | 809 } |
| 810 | |
| 811 bool Thread::set_as_starting_thread() { | |
| 812 // NOTE: this must be called inside the main thread. | |
| 813 return os::create_main_thread((JavaThread*)this); | |
| 814 } | |
| 815 | |
| 816 static void initialize_class(symbolHandle class_name, TRAPS) { | |
| 817 klassOop klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); | |
| 818 instanceKlass::cast(klass)->initialize(CHECK); | |
| 819 } | |
| 820 | |
| 821 | |
| 822 // Creates the initial ThreadGroup | |
| 823 static Handle create_initial_thread_group(TRAPS) { | |
| 824 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_ThreadGroup(), true, CHECK_NH); | |
| 825 instanceKlassHandle klass (THREAD, k); | |
| 826 | |
| 827 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 828 { | |
| 829 JavaValue result(T_VOID); | |
| 830 JavaCalls::call_special(&result, | |
| 831 system_instance, | |
| 832 klass, | |
| 833 vmSymbolHandles::object_initializer_name(), | |
| 834 vmSymbolHandles::void_method_signature(), | |
| 835 CHECK_NH); | |
| 836 } | |
| 837 Universe::set_system_thread_group(system_instance()); | |
| 838 | |
| 839 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
| 840 { | |
| 841 JavaValue result(T_VOID); | |
| 842 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
| 843 JavaCalls::call_special(&result, | |
| 844 main_instance, | |
| 845 klass, | |
| 846 vmSymbolHandles::object_initializer_name(), | |
| 847 vmSymbolHandles::threadgroup_string_void_signature(), | |
| 848 system_instance, | |
| 849 string, | |
| 850 CHECK_NH); | |
| 851 } | |
| 852 return main_instance; | |
| 853 } | |
| 854 | |
| 855 // Creates the initial Thread | |
| 856 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
| 857 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_Thread(), true, CHECK_NULL); | |
| 858 instanceKlassHandle klass (THREAD, k); | |
| 859 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
| 860 | |
| 861 java_lang_Thread::set_thread(thread_oop(), thread); | |
| 862 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 863 thread->set_threadObj(thread_oop()); | |
| 864 | |
| 865 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
| 866 | |
| 867 JavaValue result(T_VOID); | |
| 868 JavaCalls::call_special(&result, thread_oop, | |
| 869 klass, | |
| 870 vmSymbolHandles::object_initializer_name(), | |
| 871 vmSymbolHandles::threadgroup_string_void_signature(), | |
| 872 thread_group, | |
| 873 string, | |
| 874 CHECK_NULL); | |
| 875 return thread_oop(); | |
| 876 } | |
| 877 | |
| 878 static void call_initializeSystemClass(TRAPS) { | |
| 879 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_System(), true, CHECK); | |
| 880 instanceKlassHandle klass (THREAD, k); | |
| 881 | |
| 882 JavaValue result(T_VOID); | |
| 883 JavaCalls::call_static(&result, klass, vmSymbolHandles::initializeSystemClass_name(), | |
| 884 vmSymbolHandles::void_method_signature(), CHECK); | |
| 885 } | |
| 886 | |
| 887 static void reset_vm_info_property(TRAPS) { | |
| 888 // the vm info string | |
| 889 ResourceMark rm(THREAD); | |
| 890 const char *vm_info = VM_Version::vm_info_string(); | |
| 891 | |
| 892 // java.lang.System class | |
| 893 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_System(), true, CHECK); | |
| 894 instanceKlassHandle klass (THREAD, k); | |
| 895 | |
| 896 // setProperty arguments | |
| 897 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
| 898 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
| 899 | |
| 900 // return value | |
| 901 JavaValue r(T_OBJECT); | |
| 902 | |
| 903 // public static String setProperty(String key, String value); | |
| 904 JavaCalls::call_static(&r, | |
| 905 klass, | |
| 906 vmSymbolHandles::setProperty_name(), | |
| 907 vmSymbolHandles::string_string_string_signature(), | |
| 908 key_str, | |
| 909 value_str, | |
| 910 CHECK); | |
| 911 } | |
| 912 | |
| 913 | |
| 914 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
| 915 assert(thread_group.not_null(), "thread group should be specified"); | |
| 916 assert(threadObj() == NULL, "should only create Java thread object once"); | |
| 917 | |
| 918 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_Thread(), true, CHECK); | |
| 919 instanceKlassHandle klass (THREAD, k); | |
| 920 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
| 921 | |
| 922 java_lang_Thread::set_thread(thread_oop(), this); | |
| 923 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
| 924 set_threadObj(thread_oop()); | |
| 925 | |
| 926 JavaValue result(T_VOID); | |
| 927 if (thread_name != NULL) { | |
| 928 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
| 929 // Thread gets assigned specified name and null target | |
| 930 JavaCalls::call_special(&result, | |
| 931 thread_oop, | |
| 932 klass, | |
| 933 vmSymbolHandles::object_initializer_name(), | |
| 934 vmSymbolHandles::threadgroup_string_void_signature(), | |
| 935 thread_group, // Argument 1 | |
| 936 name, // Argument 2 | |
| 937 THREAD); | |
| 938 } else { | |
| 939 // Thread gets assigned name "Thread-nnn" and null target | |
| 940 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
| 941 JavaCalls::call_special(&result, | |
| 942 thread_oop, | |
| 943 klass, | |
| 944 vmSymbolHandles::object_initializer_name(), | |
| 945 vmSymbolHandles::threadgroup_runnable_void_signature(), | |
| 946 thread_group, // Argument 1 | |
| 947 Handle(), // Argument 2 | |
| 948 THREAD); | |
| 949 } | |
| 950 | |
| 951 | |
| 952 if (daemon) { | |
| 953 java_lang_Thread::set_daemon(thread_oop()); | |
| 954 } | |
| 955 | |
| 956 if (HAS_PENDING_EXCEPTION) { | |
| 957 return; | |
| 958 } | |
| 959 | |
| 960 KlassHandle group(this, SystemDictionary::threadGroup_klass()); | |
| 961 Handle threadObj(this, this->threadObj()); | |
| 962 | |
| 963 JavaCalls::call_special(&result, | |
| 964 thread_group, | |
| 965 group, | |
| 966 vmSymbolHandles::add_method_name(), | |
| 967 vmSymbolHandles::thread_void_signature(), | |
| 968 threadObj, // Arg 1 | |
| 969 THREAD); | |
| 970 | |
| 971 | |
| 972 } | |
| 973 | |
| 974 // NamedThread -- non-JavaThread subclasses with multiple | |
| 975 // uniquely named instances should derive from this. | |
| 976 NamedThread::NamedThread() : Thread() { | |
| 977 _name = NULL; | |
| 978 } | |
| 979 | |
| 980 NamedThread::~NamedThread() { | |
| 981 if (_name != NULL) { | |
| 982 FREE_C_HEAP_ARRAY(char, _name); | |
| 983 _name = NULL; | |
| 984 } | |
| 985 } | |
| 986 | |
| 987 void NamedThread::set_name(const char* format, ...) { | |
| 988 guarantee(_name == NULL, "Only get to set name once."); | |
| 989 _name = NEW_C_HEAP_ARRAY(char, max_name_len); | |
| 990 guarantee(_name != NULL, "alloc failure"); | |
| 991 va_list ap; | |
| 992 va_start(ap, format); | |
| 993 jio_vsnprintf(_name, max_name_len, format, ap); | |
| 994 va_end(ap); | |
| 995 } | |
| 996 | |
| 997 // ======= WatcherThread ======== | |
| 998 | |
| 999 // The watcher thread exists to simulate timer interrupts. It should | |
| 1000 // be replaced by an abstraction over whatever native support for | |
| 1001 // timer interrupts exists on the platform. | |
| 1002 | |
| 1003 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
| 1004 bool WatcherThread::_should_terminate = false; | |
| 1005 | |
| 1006 WatcherThread::WatcherThread() : Thread() { | |
| 1007 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
| 1008 if (os::create_thread(this, os::watcher_thread)) { | |
| 1009 _watcher_thread = this; | |
| 1010 | |
| 1011 // Set the watcher thread to the highest OS priority which should not be | |
| 1012 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
| 1013 // is created. The only normal thread using this priority is the reference | |
| 1014 // handler thread, which runs for very short intervals only. | |
| 1015 // If the VMThread's priority is not lower than the WatcherThread profiling | |
| 1016 // will be inaccurate. | |
| 1017 os::set_priority(this, MaxPriority); | |
| 1018 if (!DisableStartThread) { | |
| 1019 os::start_thread(this); | |
| 1020 } | |
| 1021 } | |
| 1022 } | |
| 1023 | |
| 1024 void WatcherThread::run() { | |
| 1025 assert(this == watcher_thread(), "just checking"); | |
| 1026 | |
| 1027 this->record_stack_base_and_size(); | |
| 1028 this->initialize_thread_local_storage(); | |
| 1029 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1030 while(!_should_terminate) { | |
| 1031 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
| 1032 assert(watcher_thread() == this, "thread consistency check"); | |
| 1033 | |
| 1034 // Calculate how long it'll be until the next PeriodicTask work | |
| 1035 // should be done, and sleep that amount of time. | |
| 1036 const size_t time_to_wait = PeriodicTask::time_to_wait(); | |
| 1037 os::sleep(this, time_to_wait, false); | |
| 1038 | |
| 1039 if (is_error_reported()) { | |
| 1040 // A fatal error has happened, the error handler(VMError::report_and_die) | |
| 1041 // should abort JVM after creating an error log file. However in some | |
| 1042 // rare cases, the error handler itself might deadlock. Here we try to | |
| 1043 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
| 1044 // | |
| 1045 // This code is in WatcherThread because WatcherThread wakes up | |
| 1046 // periodically so the fatal error handler doesn't need to do anything; | |
| 1047 // also because the WatcherThread is less likely to crash than other | |
| 1048 // threads. | |
| 1049 | |
| 1050 for (;;) { | |
| 1051 if (!ShowMessageBoxOnError | |
| 1052 && (OnError == NULL || OnError[0] == '\0') | |
| 1053 && Arguments::abort_hook() == NULL) { | |
| 1054 os::sleep(this, 2 * 60 * 1000, false); | |
| 1055 fdStream err(defaultStream::output_fd()); | |
| 1056 err.print_raw_cr("# [ timer expired, abort... ]"); | |
| 1057 // skip atexit/vm_exit/vm_abort hooks | |
| 1058 os::die(); | |
| 1059 } | |
| 1060 | |
| 1061 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
| 1062 // ShowMessageBoxOnError when it is ready to abort. | |
| 1063 os::sleep(this, 5 * 1000, false); | |
| 1064 } | |
| 1065 } | |
| 1066 | |
| 1067 PeriodicTask::real_time_tick(time_to_wait); | |
| 1068 | |
| 1069 // If we have no more tasks left due to dynamic disenrollment, | |
| 1070 // shut down the thread since we don't currently support dynamic enrollment | |
| 1071 if (PeriodicTask::num_tasks() == 0) { | |
| 1072 _should_terminate = true; | |
| 1073 } | |
| 1074 } | |
| 1075 | |
| 1076 // Signal that it is terminated | |
| 1077 { | |
| 1078 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
| 1079 _watcher_thread = NULL; | |
| 1080 Terminator_lock->notify(); | |
| 1081 } | |
| 1082 | |
| 1083 // Thread destructor usually does this.. | |
| 1084 ThreadLocalStorage::set_thread(NULL); | |
| 1085 } | |
| 1086 | |
| 1087 void WatcherThread::start() { | |
| 1088 if (watcher_thread() == NULL) { | |
| 1089 _should_terminate = false; | |
| 1090 // Create the single instance of WatcherThread | |
| 1091 new WatcherThread(); | |
| 1092 } | |
| 1093 } | |
| 1094 | |
| 1095 void WatcherThread::stop() { | |
| 1096 // it is ok to take late safepoints here, if needed | |
| 1097 MutexLocker mu(Terminator_lock); | |
| 1098 _should_terminate = true; | |
| 1099 while(watcher_thread() != NULL) { | |
| 1100 // This wait should make safepoint checks, wait without a timeout, | |
| 1101 // and wait as a suspend-equivalent condition. | |
| 1102 // | |
| 1103 // Note: If the FlatProfiler is running, then this thread is waiting | |
| 1104 // for the WatcherThread to terminate and the WatcherThread, via the | |
| 1105 // FlatProfiler task, is waiting for the external suspend request on | |
| 1106 // this thread to complete. wait_for_ext_suspend_completion() will | |
| 1107 // eventually timeout, but that takes time. Making this wait a | |
| 1108 // suspend-equivalent condition solves that timeout problem. | |
| 1109 // | |
| 1110 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 1111 Mutex::_as_suspend_equivalent_flag); | |
| 1112 } | |
| 1113 } | |
| 1114 | |
| 1115 void WatcherThread::print_on(outputStream* st) const { | |
| 1116 st->print("\"%s\" ", name()); | |
| 1117 Thread::print_on(st); | |
| 1118 st->cr(); | |
| 1119 } | |
| 1120 | |
| 1121 // ======= JavaThread ======== | |
| 1122 | |
| 1123 // A JavaThread is a normal Java thread | |
| 1124 | |
| 1125 void JavaThread::initialize() { | |
| 1126 // Initialize fields | |
|
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1127 |
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1128 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1129 set_claimed_par_id(-1); |
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1130 |
| 0 | 1131 set_saved_exception_pc(NULL); |
| 1132 set_threadObj(NULL); | |
| 1133 _anchor.clear(); | |
| 1134 set_entry_point(NULL); | |
| 1135 set_jni_functions(jni_functions()); | |
| 1136 set_callee_target(NULL); | |
| 1137 set_vm_result(NULL); | |
| 1138 set_vm_result_2(NULL); | |
| 1139 set_vframe_array_head(NULL); | |
| 1140 set_vframe_array_last(NULL); | |
| 1141 set_deferred_locals(NULL); | |
| 1142 set_deopt_mark(NULL); | |
| 1143 clear_must_deopt_id(); | |
| 1144 set_monitor_chunks(NULL); | |
| 1145 set_next(NULL); | |
| 1146 set_thread_state(_thread_new); | |
| 1147 _terminated = _not_terminated; | |
| 1148 _privileged_stack_top = NULL; | |
| 1149 _array_for_gc = NULL; | |
| 1150 _suspend_equivalent = false; | |
| 1151 _in_deopt_handler = 0; | |
| 1152 _doing_unsafe_access = false; | |
| 1153 _stack_guard_state = stack_guard_unused; | |
| 1154 _exception_oop = NULL; | |
| 1155 _exception_pc = 0; | |
| 1156 _exception_handler_pc = 0; | |
| 1157 _exception_stack_size = 0; | |
| 1158 _jvmti_thread_state= NULL; | |
| 1159 _jvmti_get_loaded_classes_closure = NULL; | |
| 1160 _interp_only_mode = 0; | |
| 1161 _special_runtime_exit_condition = _no_async_condition; | |
| 1162 _pending_async_exception = NULL; | |
| 1163 _is_compiling = false; | |
| 1164 _thread_stat = NULL; | |
| 1165 _thread_stat = new ThreadStatistics(); | |
| 1166 _blocked_on_compilation = false; | |
| 1167 _jni_active_critical = 0; | |
| 1168 _do_not_unlock_if_synchronized = false; | |
| 1169 _cached_monitor_info = NULL; | |
| 1170 _parker = Parker::Allocate(this) ; | |
| 1171 | |
| 1172 #ifndef PRODUCT | |
| 1173 _jmp_ring_index = 0; | |
| 1174 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
| 1175 record_jump(NULL, NULL, NULL, 0); | |
| 1176 } | |
| 1177 #endif /* PRODUCT */ | |
| 1178 | |
| 1179 set_thread_profiler(NULL); | |
| 1180 if (FlatProfiler::is_active()) { | |
| 1181 // This is where we would decide to either give each thread it's own profiler | |
| 1182 // or use one global one from FlatProfiler, | |
| 1183 // or up to some count of the number of profiled threads, etc. | |
| 1184 ThreadProfiler* pp = new ThreadProfiler(); | |
| 1185 pp->engage(); | |
| 1186 set_thread_profiler(pp); | |
| 1187 } | |
| 1188 | |
| 1189 // Setup safepoint state info for this thread | |
| 1190 ThreadSafepointState::create(this); | |
| 1191 | |
| 1192 debug_only(_java_call_counter = 0); | |
| 1193 | |
| 1194 // JVMTI PopFrame support | |
| 1195 _popframe_condition = popframe_inactive; | |
| 1196 _popframe_preserved_args = NULL; | |
| 1197 _popframe_preserved_args_size = 0; | |
| 1198 | |
| 1199 pd_initialize(); | |
| 1200 } | |
| 1201 | |
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1202 #ifndef SERIALGC |
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1203 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1204 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1205 #endif // !SERIALGC |
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1206 |
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1207 JavaThread::JavaThread(bool is_attaching) : |
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1208 Thread() |
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1209 #ifndef SERIALGC |
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1210 , _satb_mark_queue(&_satb_mark_queue_set), |
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1211 _dirty_card_queue(&_dirty_card_queue_set) |
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1212 #endif // !SERIALGC |
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1213 { |
| 0 | 1214 initialize(); |
| 1215 _is_attaching = is_attaching; | |
| 1216 } | |
| 1217 | |
| 1218 bool JavaThread::reguard_stack(address cur_sp) { | |
| 1219 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
| 1220 return true; // Stack already guarded or guard pages not needed. | |
| 1221 } | |
| 1222 | |
| 1223 if (register_stack_overflow()) { | |
| 1224 // For those architectures which have separate register and | |
| 1225 // memory stacks, we must check the register stack to see if | |
| 1226 // it has overflowed. | |
| 1227 return false; | |
| 1228 } | |
| 1229 | |
| 1230 // Java code never executes within the yellow zone: the latter is only | |
| 1231 // there to provoke an exception during stack banging. If java code | |
| 1232 // is executing there, either StackShadowPages should be larger, or | |
| 1233 // some exception code in c1, c2 or the interpreter isn't unwinding | |
| 1234 // when it should. | |
| 1235 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
| 1236 | |
| 1237 enable_stack_yellow_zone(); | |
| 1238 return true; | |
| 1239 } | |
| 1240 | |
| 1241 bool JavaThread::reguard_stack(void) { | |
| 1242 return reguard_stack(os::current_stack_pointer()); | |
| 1243 } | |
| 1244 | |
| 1245 | |
| 1246 void JavaThread::block_if_vm_exited() { | |
| 1247 if (_terminated == _vm_exited) { | |
| 1248 // _vm_exited is set at safepoint, and Threads_lock is never released | |
| 1249 // we will block here forever | |
| 1250 Threads_lock->lock_without_safepoint_check(); | |
| 1251 ShouldNotReachHere(); | |
| 1252 } | |
| 1253 } | |
| 1254 | |
| 1255 | |
| 1256 // Remove this ifdef when C1 is ported to the compiler interface. | |
| 1257 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
| 1258 | |
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1259 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1260 Thread() |
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1261 #ifndef SERIALGC |
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1262 , _satb_mark_queue(&_satb_mark_queue_set), |
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1263 _dirty_card_queue(&_dirty_card_queue_set) |
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1264 #endif // !SERIALGC |
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1265 { |
| 0 | 1266 if (TraceThreadEvents) { |
| 1267 tty->print_cr("creating thread %p", this); | |
| 1268 } | |
| 1269 initialize(); | |
| 1270 _is_attaching = false; | |
| 1271 set_entry_point(entry_point); | |
| 1272 // Create the native thread itself. | |
| 1273 // %note runtime_23 | |
| 1274 os::ThreadType thr_type = os::java_thread; | |
| 1275 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
| 1276 os::java_thread; | |
| 1277 os::create_thread(this, thr_type, stack_sz); | |
| 1278 | |
| 1279 // The _osthread may be NULL here because we ran out of memory (too many threads active). | |
| 1280 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
| 1281 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
| 1282 // the exception consists of creating the exception object & initializing it, initialization | |
| 1283 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
| 1284 // | |
| 1285 // The thread is still suspended when we reach here. Thread must be explicit started | |
| 1286 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
| 1287 // by calling Threads:add. The reason why this is not done here, is because the thread | |
| 1288 // object must be fully initialized (take a look at JVM_Start) | |
| 1289 } | |
| 1290 | |
| 1291 JavaThread::~JavaThread() { | |
| 1292 if (TraceThreadEvents) { | |
| 1293 tty->print_cr("terminate thread %p", this); | |
| 1294 } | |
| 1295 | |
| 1296 // JSR166 -- return the parker to the free list | |
| 1297 Parker::Release(_parker); | |
| 1298 _parker = NULL ; | |
| 1299 | |
| 1300 // Free any remaining previous UnrollBlock | |
| 1301 vframeArray* old_array = vframe_array_last(); | |
| 1302 | |
| 1303 if (old_array != NULL) { | |
| 1304 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
| 1305 old_array->set_unroll_block(NULL); | |
| 1306 delete old_info; | |
| 1307 delete old_array; | |
| 1308 } | |
| 1309 | |
| 1310 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
| 1311 if (deferred != NULL) { | |
| 1312 // This can only happen if thread is destroyed before deoptimization occurs. | |
| 1313 assert(deferred->length() != 0, "empty array!"); | |
| 1314 do { | |
| 1315 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
| 1316 deferred->remove_at(0); | |
| 1317 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
| 1318 delete dlv; | |
| 1319 } while (deferred->length() != 0); | |
| 1320 delete deferred; | |
| 1321 } | |
| 1322 | |
| 1323 // All Java related clean up happens in exit | |
| 1324 ThreadSafepointState::destroy(this); | |
| 1325 if (_thread_profiler != NULL) delete _thread_profiler; | |
| 1326 if (_thread_stat != NULL) delete _thread_stat; | |
| 1327 } | |
| 1328 | |
| 1329 | |
| 1330 // The first routine called by a new Java thread | |
| 1331 void JavaThread::run() { | |
| 1332 // initialize thread-local alloc buffer related fields | |
| 1333 this->initialize_tlab(); | |
| 1334 | |
| 1335 // used to test validitity of stack trace backs | |
| 1336 this->record_base_of_stack_pointer(); | |
| 1337 | |
| 1338 // Record real stack base and size. | |
| 1339 this->record_stack_base_and_size(); | |
| 1340 | |
| 1341 // Initialize thread local storage; set before calling MutexLocker | |
| 1342 this->initialize_thread_local_storage(); | |
| 1343 | |
| 1344 this->create_stack_guard_pages(); | |
| 1345 | |
| 1346 // Thread is now sufficient initialized to be handled by the safepoint code as being | |
| 1347 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
| 1348 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
| 1349 | |
| 1350 assert(JavaThread::current() == this, "sanity check"); | |
| 1351 assert(!Thread::current()->owns_locks(), "sanity check"); | |
| 1352 | |
| 1353 DTRACE_THREAD_PROBE(start, this); | |
| 1354 | |
| 1355 // This operation might block. We call that after all safepoint checks for a new thread has | |
| 1356 // been completed. | |
| 1357 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 1358 | |
| 1359 if (JvmtiExport::should_post_thread_life()) { | |
| 1360 JvmtiExport::post_thread_start(this); | |
| 1361 } | |
| 1362 | |
| 1363 // We call another function to do the rest so we are sure that the stack addresses used | |
| 1364 // from there will be lower than the stack base just computed | |
| 1365 thread_main_inner(); | |
| 1366 | |
| 1367 // Note, thread is no longer valid at this point! | |
| 1368 } | |
| 1369 | |
| 1370 | |
| 1371 void JavaThread::thread_main_inner() { | |
| 1372 assert(JavaThread::current() == this, "sanity check"); | |
| 1373 assert(this->threadObj() != NULL, "just checking"); | |
| 1374 | |
| 1375 // Execute thread entry point. If this thread is being asked to restart, | |
| 1376 // or has been stopped before starting, do not reexecute entry point. | |
| 1377 // Note: Due to JVM_StopThread we can have pending exceptions already! | |
| 1378 if (!this->has_pending_exception() && !java_lang_Thread::is_stillborn(this->threadObj())) { | |
| 1379 // enter the thread's entry point only if we have no pending exceptions | |
| 1380 HandleMark hm(this); | |
| 1381 this->entry_point()(this, this); | |
| 1382 } | |
| 1383 | |
| 1384 DTRACE_THREAD_PROBE(stop, this); | |
| 1385 | |
| 1386 this->exit(false); | |
| 1387 delete this; | |
| 1388 } | |
| 1389 | |
| 1390 | |
| 1391 static void ensure_join(JavaThread* thread) { | |
| 1392 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
| 1393 Handle threadObj(thread, thread->threadObj()); | |
| 1394 assert(threadObj.not_null(), "java thread object must exist"); | |
| 1395 ObjectLocker lock(threadObj, thread); | |
| 1396 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1397 thread->clear_pending_exception(); | |
| 1398 // It is of profound importance that we set the stillborn bit and reset the thread object, | |
| 1399 // before we do the notify. Since, changing these two variable will make JVM_IsAlive return | |
| 1400 // false. So in case another thread is doing a join on this thread , it will detect that the thread | |
| 1401 // is dead when it gets notified. | |
| 1402 java_lang_Thread::set_stillborn(threadObj()); | |
| 1403 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
| 1404 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
| 1405 java_lang_Thread::set_thread(threadObj(), NULL); | |
| 1406 lock.notify_all(thread); | |
| 1407 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
| 1408 thread->clear_pending_exception(); | |
| 1409 } | |
| 1410 | |
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1411 |
| 0 | 1412 // For any new cleanup additions, please check to see if they need to be applied to |
| 1413 // cleanup_failed_attach_current_thread as well. | |
| 1414 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
| 1415 assert(this == JavaThread::current(), "thread consistency check"); | |
| 1416 if (!InitializeJavaLangSystem) return; | |
| 1417 | |
| 1418 HandleMark hm(this); | |
| 1419 Handle uncaught_exception(this, this->pending_exception()); | |
| 1420 this->clear_pending_exception(); | |
| 1421 Handle threadObj(this, this->threadObj()); | |
| 1422 assert(threadObj.not_null(), "Java thread object should be created"); | |
| 1423 | |
| 1424 if (get_thread_profiler() != NULL) { | |
| 1425 get_thread_profiler()->disengage(); | |
| 1426 ResourceMark rm; | |
| 1427 get_thread_profiler()->print(get_thread_name()); | |
| 1428 } | |
| 1429 | |
| 1430 | |
| 1431 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
| 1432 { | |
| 1433 EXCEPTION_MARK; | |
| 1434 | |
| 1435 CLEAR_PENDING_EXCEPTION; | |
| 1436 } | |
| 1437 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
| 1438 // has to be fixed by a runtime query method | |
| 1439 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
| 1440 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
| 1441 // java.lang.Thread.dispatchUncaughtException | |
| 1442 if (uncaught_exception.not_null()) { | |
| 1443 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
| 1444 Events::log("uncaught exception INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT", | |
| 1445 (address)uncaught_exception(), (address)threadObj(), (address)group()); | |
| 1446 { | |
| 1447 EXCEPTION_MARK; | |
| 1448 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
| 1449 // call it. Otherwise we have an older library without the JSR-166 changes, | |
| 1450 // so call ThreadGroup.uncaughtException() | |
| 1451 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
| 1452 CallInfo callinfo; | |
| 1453 KlassHandle thread_klass(THREAD, SystemDictionary::thread_klass()); | |
| 1454 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, | |
| 1455 vmSymbolHandles::dispatchUncaughtException_name(), | |
| 1456 vmSymbolHandles::throwable_void_signature(), | |
| 1457 KlassHandle(), false, false, THREAD); | |
| 1458 CLEAR_PENDING_EXCEPTION; | |
| 1459 methodHandle method = callinfo.selected_method(); | |
| 1460 if (method.not_null()) { | |
| 1461 JavaValue result(T_VOID); | |
| 1462 JavaCalls::call_virtual(&result, | |
| 1463 threadObj, thread_klass, | |
| 1464 vmSymbolHandles::dispatchUncaughtException_name(), | |
| 1465 vmSymbolHandles::throwable_void_signature(), | |
| 1466 uncaught_exception, | |
| 1467 THREAD); | |
| 1468 } else { | |
| 1469 KlassHandle thread_group(THREAD, SystemDictionary::threadGroup_klass()); | |
| 1470 JavaValue result(T_VOID); | |
| 1471 JavaCalls::call_virtual(&result, | |
| 1472 group, thread_group, | |
| 1473 vmSymbolHandles::uncaughtException_name(), | |
| 1474 vmSymbolHandles::thread_throwable_void_signature(), | |
| 1475 threadObj, // Arg 1 | |
| 1476 uncaught_exception, // Arg 2 | |
| 1477 THREAD); | |
| 1478 } | |
| 1479 CLEAR_PENDING_EXCEPTION; | |
| 1480 } | |
| 1481 } | |
| 1482 | |
| 1483 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during | |
| 1484 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
| 1485 // is deprecated anyhow. | |
| 1486 { int count = 3; | |
| 1487 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
| 1488 EXCEPTION_MARK; | |
| 1489 JavaValue result(T_VOID); | |
| 1490 KlassHandle thread_klass(THREAD, SystemDictionary::thread_klass()); | |
| 1491 JavaCalls::call_virtual(&result, | |
| 1492 threadObj, thread_klass, | |
| 1493 vmSymbolHandles::exit_method_name(), | |
| 1494 vmSymbolHandles::void_method_signature(), | |
| 1495 THREAD); | |
| 1496 CLEAR_PENDING_EXCEPTION; | |
| 1497 } | |
| 1498 } | |
| 1499 | |
| 1500 // notify JVMTI | |
| 1501 if (JvmtiExport::should_post_thread_life()) { | |
| 1502 JvmtiExport::post_thread_end(this); | |
| 1503 } | |
| 1504 | |
| 1505 // We have notified the agents that we are exiting, before we go on, | |
| 1506 // we must check for a pending external suspend request and honor it | |
| 1507 // in order to not surprise the thread that made the suspend request. | |
| 1508 while (true) { | |
| 1509 { | |
| 1510 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1511 if (!is_external_suspend()) { | |
| 1512 set_terminated(_thread_exiting); | |
| 1513 ThreadService::current_thread_exiting(this); | |
| 1514 break; | |
| 1515 } | |
| 1516 // Implied else: | |
| 1517 // Things get a little tricky here. We have a pending external | |
| 1518 // suspend request, but we are holding the SR_lock so we | |
| 1519 // can't just self-suspend. So we temporarily drop the lock | |
| 1520 // and then self-suspend. | |
| 1521 } | |
| 1522 | |
| 1523 ThreadBlockInVM tbivm(this); | |
| 1524 java_suspend_self(); | |
| 1525 | |
| 1526 // We're done with this suspend request, but we have to loop around | |
| 1527 // and check again. Eventually we will get SR_lock without a pending | |
| 1528 // external suspend request and will be able to mark ourselves as | |
| 1529 // exiting. | |
| 1530 } | |
| 1531 // no more external suspends are allowed at this point | |
| 1532 } else { | |
| 1533 // before_exit() has already posted JVMTI THREAD_END events | |
| 1534 } | |
| 1535 | |
| 1536 // Notify waiters on thread object. This has to be done after exit() is called | |
| 1537 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
| 1538 // group should have the destroyed bit set before waiters are notified). | |
| 1539 ensure_join(this); | |
| 1540 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
| 1541 | |
| 1542 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
| 1543 // held by this thread must be released. A detach operation must only | |
| 1544 // get here if there are no Java frames on the stack. Therefore, any | |
| 1545 // owned monitors at this point MUST be JNI-acquired monitors which are | |
| 1546 // pre-inflated and in the monitor cache. | |
| 1547 // | |
| 1548 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
| 1549 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
| 1550 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
| 1551 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
| 1552 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
| 1553 } | |
| 1554 | |
| 1555 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
| 1556 // is in a consistent state, in case GC happens | |
| 1557 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
| 1558 | |
| 1559 if (active_handles() != NULL) { | |
| 1560 JNIHandleBlock* block = active_handles(); | |
| 1561 set_active_handles(NULL); | |
| 1562 JNIHandleBlock::release_block(block); | |
| 1563 } | |
| 1564 | |
| 1565 if (free_handle_block() != NULL) { | |
| 1566 JNIHandleBlock* block = free_handle_block(); | |
| 1567 set_free_handle_block(NULL); | |
| 1568 JNIHandleBlock::release_block(block); | |
| 1569 } | |
| 1570 | |
| 1571 // These have to be removed while this is still a valid thread. | |
| 1572 remove_stack_guard_pages(); | |
| 1573 | |
| 1574 if (UseTLAB) { | |
| 1575 tlab().make_parsable(true); // retire TLAB | |
| 1576 } | |
| 1577 | |
|
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1578 if (jvmti_thread_state() != NULL) { |
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1579 JvmtiExport::cleanup_thread(this); |
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1580 } |
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1581 |
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1582 #ifndef SERIALGC |
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1583 // We must flush G1-related buffers before removing a thread from |
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1584 // the list of active threads. |
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1585 if (UseG1GC) { |
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1586 flush_barrier_queues(); |
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1587 } |
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1588 #endif |
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1589 |
| 0 | 1590 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
| 1591 Threads::remove(this); | |
| 1592 } | |
| 1593 | |
|
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1594 #ifndef SERIALGC |
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1595 // Flush G1-related queues. |
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1596 void JavaThread::flush_barrier_queues() { |
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1597 satb_mark_queue().flush(); |
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1598 dirty_card_queue().flush(); |
|
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1599 } |
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1600 #endif |
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1601 |
| 0 | 1602 void JavaThread::cleanup_failed_attach_current_thread() { |
|
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1603 if (get_thread_profiler() != NULL) { |
|
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1604 get_thread_profiler()->disengage(); |
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1605 ResourceMark rm; |
|
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1606 get_thread_profiler()->print(get_thread_name()); |
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1607 } |
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1608 |
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1609 if (active_handles() != NULL) { |
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1610 JNIHandleBlock* block = active_handles(); |
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1611 set_active_handles(NULL); |
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1612 JNIHandleBlock::release_block(block); |
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1613 } |
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1614 |
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1615 if (free_handle_block() != NULL) { |
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1616 JNIHandleBlock* block = free_handle_block(); |
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1617 set_free_handle_block(NULL); |
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1618 JNIHandleBlock::release_block(block); |
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1619 } |
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1620 |
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1621 if (UseTLAB) { |
|
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1622 tlab().make_parsable(true); // retire TLAB, if any |
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1623 } |
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1624 |
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1625 #ifndef SERIALGC |
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1626 if (UseG1GC) { |
|
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1627 flush_barrier_queues(); |
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1628 } |
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1629 #endif |
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1630 |
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1631 Threads::remove(this); |
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1632 delete this; |
| 0 | 1633 } |
| 1634 | |
| 1635 | |
|
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1636 |
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1637 |
| 0 | 1638 JavaThread* JavaThread::active() { |
| 1639 Thread* thread = ThreadLocalStorage::thread(); | |
| 1640 assert(thread != NULL, "just checking"); | |
| 1641 if (thread->is_Java_thread()) { | |
| 1642 return (JavaThread*) thread; | |
| 1643 } else { | |
| 1644 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
| 1645 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
| 1646 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
| 1647 assert(ret->is_Java_thread(), "must be a Java thread"); | |
| 1648 return ret; | |
| 1649 } | |
| 1650 } | |
| 1651 | |
| 1652 bool JavaThread::is_lock_owned(address adr) const { | |
|
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1653 if (Thread::is_lock_owned(adr)) return true; |
| 0 | 1654 |
| 1655 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 1656 if (chunk->contains(adr)) return true; | |
| 1657 } | |
| 1658 | |
| 1659 return false; | |
| 1660 } | |
| 1661 | |
| 1662 | |
| 1663 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
| 1664 chunk->set_next(monitor_chunks()); | |
| 1665 set_monitor_chunks(chunk); | |
| 1666 } | |
| 1667 | |
| 1668 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
| 1669 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
| 1670 if (monitor_chunks() == chunk) { | |
| 1671 set_monitor_chunks(chunk->next()); | |
| 1672 } else { | |
| 1673 MonitorChunk* prev = monitor_chunks(); | |
| 1674 while (prev->next() != chunk) prev = prev->next(); | |
| 1675 prev->set_next(chunk->next()); | |
| 1676 } | |
| 1677 } | |
| 1678 | |
| 1679 // JVM support. | |
| 1680 | |
| 1681 // Note: this function shouldn't block if it's called in | |
| 1682 // _thread_in_native_trans state (such as from | |
| 1683 // check_special_condition_for_native_trans()). | |
| 1684 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
| 1685 | |
| 1686 if (has_last_Java_frame() && has_async_condition()) { | |
| 1687 // If we are at a polling page safepoint (not a poll return) | |
| 1688 // then we must defer async exception because live registers | |
| 1689 // will be clobbered by the exception path. Poll return is | |
| 1690 // ok because the call we a returning from already collides | |
| 1691 // with exception handling registers and so there is no issue. | |
| 1692 // (The exception handling path kills call result registers but | |
| 1693 // this is ok since the exception kills the result anyway). | |
| 1694 | |
| 1695 if (is_at_poll_safepoint()) { | |
| 1696 // if the code we are returning to has deoptimized we must defer | |
| 1697 // the exception otherwise live registers get clobbered on the | |
| 1698 // exception path before deoptimization is able to retrieve them. | |
| 1699 // | |
| 1700 RegisterMap map(this, false); | |
| 1701 frame caller_fr = last_frame().sender(&map); | |
| 1702 assert(caller_fr.is_compiled_frame(), "what?"); | |
| 1703 if (caller_fr.is_deoptimized_frame()) { | |
| 1704 if (TraceExceptions) { | |
| 1705 ResourceMark rm; | |
| 1706 tty->print_cr("deferred async exception at compiled safepoint"); | |
| 1707 } | |
| 1708 return; | |
| 1709 } | |
| 1710 } | |
| 1711 } | |
| 1712 | |
| 1713 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
| 1714 if (condition == _no_async_condition) { | |
| 1715 // Conditions have changed since has_special_runtime_exit_condition() | |
| 1716 // was called: | |
| 1717 // - if we were here only because of an external suspend request, | |
| 1718 // then that was taken care of above (or cancelled) so we are done | |
| 1719 // - if we were here because of another async request, then it has | |
| 1720 // been cleared between the has_special_runtime_exit_condition() | |
| 1721 // and now so again we are done | |
| 1722 return; | |
| 1723 } | |
| 1724 | |
| 1725 // Check for pending async. exception | |
| 1726 if (_pending_async_exception != NULL) { | |
| 1727 // Only overwrite an already pending exception, if it is not a threadDeath. | |
| 1728 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::threaddeath_klass())) { | |
| 1729 | |
| 1730 // We cannot call Exceptions::_throw(...) here because we cannot block | |
| 1731 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
| 1732 | |
| 1733 if (TraceExceptions) { | |
| 1734 ResourceMark rm; | |
| 1735 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
| 1736 if (has_last_Java_frame() ) { | |
| 1737 frame f = last_frame(); | |
| 1738 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
| 1739 } | |
| 1740 tty->print_cr(" of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
| 1741 } | |
| 1742 _pending_async_exception = NULL; | |
| 1743 clear_has_async_exception(); | |
| 1744 } | |
| 1745 } | |
| 1746 | |
| 1747 if (check_unsafe_error && | |
| 1748 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
| 1749 condition = _no_async_condition; // done | |
| 1750 switch (thread_state()) { | |
| 1751 case _thread_in_vm: | |
| 1752 { | |
| 1753 JavaThread* THREAD = this; | |
| 1754 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 1755 } | |
| 1756 case _thread_in_native: | |
| 1757 { | |
| 1758 ThreadInVMfromNative tiv(this); | |
| 1759 JavaThread* THREAD = this; | |
| 1760 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
| 1761 } | |
| 1762 case _thread_in_Java: | |
| 1763 { | |
| 1764 ThreadInVMfromJava tiv(this); | |
| 1765 JavaThread* THREAD = this; | |
| 1766 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
| 1767 } | |
| 1768 default: | |
| 1769 ShouldNotReachHere(); | |
| 1770 } | |
| 1771 } | |
| 1772 | |
| 1773 assert(condition == _no_async_condition || has_pending_exception() || | |
| 1774 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
| 1775 "must have handled the async condition, if no exception"); | |
| 1776 } | |
| 1777 | |
| 1778 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
| 1779 // | |
| 1780 // Check for pending external suspend. Internal suspend requests do | |
| 1781 // not use handle_special_runtime_exit_condition(). | |
| 1782 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 1783 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 1784 // threads could call into the VM with another thread's JNIEnv so we | |
| 1785 // can be here operating on behalf of a suspended thread (4432884). | |
| 1786 bool do_self_suspend = is_external_suspend_with_lock(); | |
| 1787 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
| 1788 // | |
| 1789 // Because thread is external suspended the safepoint code will count | |
| 1790 // thread as at a safepoint. This can be odd because we can be here | |
| 1791 // as _thread_in_Java which would normally transition to _thread_blocked | |
| 1792 // at a safepoint. We would like to mark the thread as _thread_blocked | |
| 1793 // before calling java_suspend_self like all other callers of it but | |
| 1794 // we must then observe proper safepoint protocol. (We can't leave | |
| 1795 // _thread_blocked with a safepoint in progress). However we can be | |
| 1796 // here as _thread_in_native_trans so we can't use a normal transition | |
| 1797 // constructor/destructor pair because they assert on that type of | |
| 1798 // transition. We could do something like: | |
| 1799 // | |
| 1800 // JavaThreadState state = thread_state(); | |
| 1801 // set_thread_state(_thread_in_vm); | |
| 1802 // { | |
| 1803 // ThreadBlockInVM tbivm(this); | |
| 1804 // java_suspend_self() | |
| 1805 // } | |
| 1806 // set_thread_state(_thread_in_vm_trans); | |
| 1807 // if (safepoint) block; | |
| 1808 // set_thread_state(state); | |
| 1809 // | |
| 1810 // but that is pretty messy. Instead we just go with the way the | |
| 1811 // code has worked before and note that this is the only path to | |
| 1812 // java_suspend_self that doesn't put the thread in _thread_blocked | |
| 1813 // mode. | |
| 1814 | |
| 1815 frame_anchor()->make_walkable(this); | |
| 1816 java_suspend_self(); | |
| 1817 | |
| 1818 // We might be here for reasons in addition to the self-suspend request | |
| 1819 // so check for other async requests. | |
| 1820 } | |
| 1821 | |
| 1822 if (check_asyncs) { | |
| 1823 check_and_handle_async_exceptions(); | |
| 1824 } | |
| 1825 } | |
| 1826 | |
| 1827 void JavaThread::send_thread_stop(oop java_throwable) { | |
| 1828 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
| 1829 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
| 1830 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
| 1831 | |
| 1832 // Do not throw asynchronous exceptions against the compiler thread | |
| 1833 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
| 1834 if (is_Compiler_thread()) return; | |
| 1835 | |
| 1836 // This is a change from JDK 1.1, but JDK 1.2 will also do it: | |
| 1837 if (java_throwable->is_a(SystemDictionary::threaddeath_klass())) { | |
| 1838 java_lang_Thread::set_stillborn(threadObj()); | |
| 1839 } | |
| 1840 | |
| 1841 { | |
| 1842 // Actually throw the Throwable against the target Thread - however | |
| 1843 // only if there is no thread death exception installed already. | |
| 1844 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::threaddeath_klass())) { | |
| 1845 // If the topmost frame is a runtime stub, then we are calling into | |
| 1846 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
| 1847 // must deoptimize the caller before continuing, as the compiled exception handler table | |
| 1848 // may not be valid | |
| 1849 if (has_last_Java_frame()) { | |
| 1850 frame f = last_frame(); | |
| 1851 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
| 1852 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 1853 RegisterMap reg_map(this, UseBiasedLocking); | |
| 1854 frame compiled_frame = f.sender(®_map); | |
| 1855 if (compiled_frame.can_be_deoptimized()) { | |
| 1856 Deoptimization::deoptimize(this, compiled_frame, ®_map); | |
| 1857 } | |
| 1858 } | |
| 1859 } | |
| 1860 | |
| 1861 // Set async. pending exception in thread. | |
| 1862 set_pending_async_exception(java_throwable); | |
| 1863 | |
| 1864 if (TraceExceptions) { | |
| 1865 ResourceMark rm; | |
| 1866 tty->print_cr("Pending Async. exception installed of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
| 1867 } | |
| 1868 // for AbortVMOnException flag | |
| 1869 NOT_PRODUCT(Exceptions::debug_check_abort(instanceKlass::cast(_pending_async_exception->klass())->external_name())); | |
| 1870 } | |
| 1871 } | |
| 1872 | |
| 1873 | |
| 1874 // Interrupt thread so it will wake up from a potential wait() | |
| 1875 Thread::interrupt(this); | |
| 1876 } | |
| 1877 | |
| 1878 // External suspension mechanism. | |
| 1879 // | |
| 1880 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
| 1881 // to any VM_locks and it is at a transition | |
| 1882 // Self-suspension will happen on the transition out of the vm. | |
| 1883 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
| 1884 // | |
| 1885 // Guarantees on return: | |
| 1886 // + Target thread will not execute any new bytecode (that's why we need to | |
| 1887 // force a safepoint) | |
| 1888 // + Target thread will not enter any new monitors | |
| 1889 // | |
| 1890 void JavaThread::java_suspend() { | |
| 1891 { MutexLocker mu(Threads_lock); | |
| 1892 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
| 1893 return; | |
| 1894 } | |
| 1895 } | |
| 1896 | |
| 1897 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1898 if (!is_external_suspend()) { | |
| 1899 // a racing resume has cancelled us; bail out now | |
| 1900 return; | |
| 1901 } | |
| 1902 | |
| 1903 // suspend is done | |
| 1904 uint32_t debug_bits = 0; | |
| 1905 // Warning: is_ext_suspend_completed() may temporarily drop the | |
| 1906 // SR_lock to allow the thread to reach a stable thread state if | |
| 1907 // it is currently in a transient thread state. | |
| 1908 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
| 1909 SuspendRetryDelay, &debug_bits) ) { | |
| 1910 return; | |
| 1911 } | |
| 1912 } | |
| 1913 | |
| 1914 VM_ForceSafepoint vm_suspend; | |
| 1915 VMThread::execute(&vm_suspend); | |
| 1916 } | |
| 1917 | |
| 1918 // Part II of external suspension. | |
| 1919 // A JavaThread self suspends when it detects a pending external suspend | |
| 1920 // request. This is usually on transitions. It is also done in places | |
| 1921 // where continuing to the next transition would surprise the caller, | |
| 1922 // e.g., monitor entry. | |
| 1923 // | |
| 1924 // Returns the number of times that the thread self-suspended. | |
| 1925 // | |
| 1926 // Note: DO NOT call java_suspend_self() when you just want to block current | |
| 1927 // thread. java_suspend_self() is the second stage of cooperative | |
| 1928 // suspension for external suspend requests and should only be used | |
| 1929 // to complete an external suspend request. | |
| 1930 // | |
| 1931 int JavaThread::java_suspend_self() { | |
| 1932 int ret = 0; | |
| 1933 | |
| 1934 // we are in the process of exiting so don't suspend | |
| 1935 if (is_exiting()) { | |
| 1936 clear_external_suspend(); | |
| 1937 return ret; | |
| 1938 } | |
| 1939 | |
| 1940 assert(_anchor.walkable() || | |
| 1941 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
| 1942 "must have walkable stack"); | |
| 1943 | |
| 1944 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 1945 | |
| 1946 assert(!this->is_any_suspended(), | |
| 1947 "a thread trying to self-suspend should not already be suspended"); | |
| 1948 | |
| 1949 if (this->is_suspend_equivalent()) { | |
| 1950 // If we are self-suspending as a result of the lifting of a | |
| 1951 // suspend equivalent condition, then the suspend_equivalent | |
| 1952 // flag is not cleared until we set the ext_suspended flag so | |
| 1953 // that wait_for_ext_suspend_completion() returns consistent | |
| 1954 // results. | |
| 1955 this->clear_suspend_equivalent(); | |
| 1956 } | |
| 1957 | |
| 1958 // A racing resume may have cancelled us before we grabbed SR_lock | |
| 1959 // above. Or another external suspend request could be waiting for us | |
| 1960 // by the time we return from SR_lock()->wait(). The thread | |
| 1961 // that requested the suspension may already be trying to walk our | |
| 1962 // stack and if we return now, we can change the stack out from under | |
| 1963 // it. This would be a "bad thing (TM)" and cause the stack walker | |
| 1964 // to crash. We stay self-suspended until there are no more pending | |
| 1965 // external suspend requests. | |
| 1966 while (is_external_suspend()) { | |
| 1967 ret++; | |
| 1968 this->set_ext_suspended(); | |
| 1969 | |
| 1970 // _ext_suspended flag is cleared by java_resume() | |
| 1971 while (is_ext_suspended()) { | |
| 1972 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
| 1973 } | |
| 1974 } | |
| 1975 | |
| 1976 return ret; | |
| 1977 } | |
| 1978 | |
| 1979 #ifdef ASSERT | |
| 1980 // verify the JavaThread has not yet been published in the Threads::list, and | |
| 1981 // hence doesn't need protection from concurrent access at this stage | |
| 1982 void JavaThread::verify_not_published() { | |
| 1983 if (!Threads_lock->owned_by_self()) { | |
| 1984 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
| 1985 assert( !Threads::includes(this), | |
| 1986 "java thread shouldn't have been published yet!"); | |
| 1987 } | |
| 1988 else { | |
| 1989 assert( !Threads::includes(this), | |
| 1990 "java thread shouldn't have been published yet!"); | |
| 1991 } | |
| 1992 } | |
| 1993 #endif | |
| 1994 | |
| 1995 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 1996 // progress or when _suspend_flags is non-zero. | |
| 1997 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 1998 // block if a safepoint is in progress. | |
| 1999 // Async exception ISN'T checked. | |
| 2000 // Note only the ThreadInVMfromNative transition can call this function | |
| 2001 // directly and when thread state is _thread_in_native_trans | |
| 2002 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
| 2003 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
| 2004 | |
| 2005 JavaThread *curJT = JavaThread::current(); | |
| 2006 bool do_self_suspend = thread->is_external_suspend(); | |
| 2007 | |
| 2008 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
| 2009 | |
| 2010 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
| 2011 // thread is not the current thread. In older versions of jdbx, jdbx | |
| 2012 // threads could call into the VM with another thread's JNIEnv so we | |
| 2013 // can be here operating on behalf of a suspended thread (4432884). | |
| 2014 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
| 2015 JavaThreadState state = thread->thread_state(); | |
| 2016 | |
| 2017 // We mark this thread_blocked state as a suspend-equivalent so | |
| 2018 // that a caller to is_ext_suspend_completed() won't be confused. | |
| 2019 // The suspend-equivalent state is cleared by java_suspend_self(). | |
| 2020 thread->set_suspend_equivalent(); | |
| 2021 | |
| 2022 // If the safepoint code sees the _thread_in_native_trans state, it will | |
| 2023 // wait until the thread changes to other thread state. There is no | |
| 2024 // guarantee on how soon we can obtain the SR_lock and complete the | |
| 2025 // self-suspend request. It would be a bad idea to let safepoint wait for | |
| 2026 // too long. Temporarily change the state to _thread_blocked to | |
| 2027 // let the VM thread know that this thread is ready for GC. The problem | |
| 2028 // of changing thread state is that safepoint could happen just after | |
| 2029 // java_suspend_self() returns after being resumed, and VM thread will | |
| 2030 // see the _thread_blocked state. We must check for safepoint | |
| 2031 // after restoring the state and make sure we won't leave while a safepoint | |
| 2032 // is in progress. | |
| 2033 thread->set_thread_state(_thread_blocked); | |
| 2034 thread->java_suspend_self(); | |
| 2035 thread->set_thread_state(state); | |
| 2036 // Make sure new state is seen by VM thread | |
| 2037 if (os::is_MP()) { | |
| 2038 if (UseMembar) { | |
| 2039 // Force a fence between the write above and read below | |
| 2040 OrderAccess::fence(); | |
| 2041 } else { | |
| 2042 // Must use this rather than serialization page in particular on Windows | |
| 2043 InterfaceSupport::serialize_memory(thread); | |
| 2044 } | |
| 2045 } | |
| 2046 } | |
| 2047 | |
| 2048 if (SafepointSynchronize::do_call_back()) { | |
| 2049 // If we are safepointing, then block the caller which may not be | |
| 2050 // the same as the target thread (see above). | |
| 2051 SafepointSynchronize::block(curJT); | |
| 2052 } | |
| 2053 | |
| 2054 if (thread->is_deopt_suspend()) { | |
| 2055 thread->clear_deopt_suspend(); | |
| 2056 RegisterMap map(thread, false); | |
| 2057 frame f = thread->last_frame(); | |
| 2058 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
| 2059 f = f.sender(&map); | |
| 2060 } | |
| 2061 if (f.id() == thread->must_deopt_id()) { | |
| 2062 thread->clear_must_deopt_id(); | |
| 2063 // Since we know we're safe to deopt the current state is a safe state | |
| 2064 f.deoptimize(thread, true); | |
| 2065 } else { | |
| 2066 fatal("missed deoptimization!"); | |
| 2067 } | |
| 2068 } | |
| 2069 } | |
| 2070 | |
| 2071 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
| 2072 // progress or when _suspend_flags is non-zero. | |
| 2073 // Current thread needs to self-suspend if there is a suspend request and/or | |
| 2074 // block if a safepoint is in progress. | |
| 2075 // Also check for pending async exception (not including unsafe access error). | |
| 2076 // Note only the native==>VM/Java barriers can call this function and when | |
| 2077 // thread state is _thread_in_native_trans. | |
| 2078 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
| 2079 check_safepoint_and_suspend_for_native_trans(thread); | |
| 2080 | |
| 2081 if (thread->has_async_exception()) { | |
| 2082 // We are in _thread_in_native_trans state, don't handle unsafe | |
| 2083 // access error since that may block. | |
| 2084 thread->check_and_handle_async_exceptions(false); | |
| 2085 } | |
| 2086 } | |
| 2087 | |
| 2088 // We need to guarantee the Threads_lock here, since resumes are not | |
| 2089 // allowed during safepoint synchronization | |
| 2090 // Can only resume from an external suspension | |
| 2091 void JavaThread::java_resume() { | |
| 2092 assert_locked_or_safepoint(Threads_lock); | |
| 2093 | |
| 2094 // Sanity check: thread is gone, has started exiting or the thread | |
| 2095 // was not externally suspended. | |
| 2096 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
| 2097 return; | |
| 2098 } | |
| 2099 | |
| 2100 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
| 2101 | |
| 2102 clear_external_suspend(); | |
| 2103 | |
| 2104 if (is_ext_suspended()) { | |
| 2105 clear_ext_suspended(); | |
| 2106 SR_lock()->notify_all(); | |
| 2107 } | |
| 2108 } | |
| 2109 | |
| 2110 void JavaThread::create_stack_guard_pages() { | |
| 2111 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
| 2112 address low_addr = stack_base() - stack_size(); | |
| 2113 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2114 | |
| 2115 int allocate = os::allocate_stack_guard_pages(); | |
| 2116 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
| 2117 | |
| 2118 if (allocate && !os::commit_memory((char *) low_addr, len)) { | |
| 2119 warning("Attempt to allocate stack guard pages failed."); | |
| 2120 return; | |
| 2121 } | |
| 2122 | |
| 2123 if (os::guard_memory((char *) low_addr, len)) { | |
| 2124 _stack_guard_state = stack_guard_enabled; | |
| 2125 } else { | |
| 2126 warning("Attempt to protect stack guard pages failed."); | |
| 2127 if (os::uncommit_memory((char *) low_addr, len)) { | |
| 2128 warning("Attempt to deallocate stack guard pages failed."); | |
| 2129 } | |
| 2130 } | |
| 2131 } | |
| 2132 | |
| 2133 void JavaThread::remove_stack_guard_pages() { | |
| 2134 if (_stack_guard_state == stack_guard_unused) return; | |
| 2135 address low_addr = stack_base() - stack_size(); | |
| 2136 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
| 2137 | |
| 2138 if (os::allocate_stack_guard_pages()) { | |
| 2139 if (os::uncommit_memory((char *) low_addr, len)) { | |
| 2140 _stack_guard_state = stack_guard_unused; | |
| 2141 } else { | |
| 2142 warning("Attempt to deallocate stack guard pages failed."); | |
| 2143 } | |
| 2144 } else { | |
| 2145 if (_stack_guard_state == stack_guard_unused) return; | |
| 2146 if (os::unguard_memory((char *) low_addr, len)) { | |
| 2147 _stack_guard_state = stack_guard_unused; | |
| 2148 } else { | |
| 2149 warning("Attempt to unprotect stack guard pages failed."); | |
| 2150 } | |
| 2151 } | |
| 2152 } | |
| 2153 | |
| 2154 void JavaThread::enable_stack_yellow_zone() { | |
| 2155 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2156 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
| 2157 | |
| 2158 // The base notation is from the stacks point of view, growing downward. | |
| 2159 // We need to adjust it to work correctly with guard_memory() | |
| 2160 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2161 | |
| 2162 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
| 2163 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
| 2164 | |
| 2165 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
| 2166 _stack_guard_state = stack_guard_enabled; | |
| 2167 } else { | |
| 2168 warning("Attempt to guard stack yellow zone failed."); | |
| 2169 } | |
| 2170 enable_register_stack_guard(); | |
| 2171 } | |
| 2172 | |
| 2173 void JavaThread::disable_stack_yellow_zone() { | |
| 2174 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2175 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
| 2176 | |
| 2177 // Simply return if called for a thread that does not use guard pages. | |
| 2178 if (_stack_guard_state == stack_guard_unused) return; | |
| 2179 | |
| 2180 // The base notation is from the stacks point of view, growing downward. | |
| 2181 // We need to adjust it to work correctly with guard_memory() | |
| 2182 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
| 2183 | |
| 2184 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
| 2185 _stack_guard_state = stack_guard_yellow_disabled; | |
| 2186 } else { | |
| 2187 warning("Attempt to unguard stack yellow zone failed."); | |
| 2188 } | |
| 2189 disable_register_stack_guard(); | |
| 2190 } | |
| 2191 | |
| 2192 void JavaThread::enable_stack_red_zone() { | |
| 2193 // The base notation is from the stacks point of view, growing downward. | |
| 2194 // We need to adjust it to work correctly with guard_memory() | |
| 2195 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2196 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2197 | |
| 2198 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
| 2199 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
| 2200 | |
| 2201 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
| 2202 warning("Attempt to guard stack red zone failed."); | |
| 2203 } | |
| 2204 } | |
| 2205 | |
| 2206 void JavaThread::disable_stack_red_zone() { | |
| 2207 // The base notation is from the stacks point of view, growing downward. | |
| 2208 // We need to adjust it to work correctly with guard_memory() | |
| 2209 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
| 2210 address base = stack_red_zone_base() - stack_red_zone_size(); | |
| 2211 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
| 2212 warning("Attempt to unguard stack red zone failed."); | |
| 2213 } | |
| 2214 } | |
| 2215 | |
| 2216 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
| 2217 // ignore is there is no stack | |
| 2218 if (!has_last_Java_frame()) return; | |
| 2219 // traverse the stack frames. Starts from top frame. | |
| 2220 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2221 frame* fr = fst.current(); | |
| 2222 f(fr, fst.register_map()); | |
| 2223 } | |
| 2224 } | |
| 2225 | |
| 2226 | |
| 2227 #ifndef PRODUCT | |
| 2228 // Deoptimization | |
| 2229 // Function for testing deoptimization | |
| 2230 void JavaThread::deoptimize() { | |
| 2231 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2232 StackFrameStream fst(this, UseBiasedLocking); | |
| 2233 bool deopt = false; // Dump stack only if a deopt actually happens. | |
| 2234 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
| 2235 // Iterate over all frames in the thread and deoptimize | |
| 2236 for(; !fst.is_done(); fst.next()) { | |
| 2237 if(fst.current()->can_be_deoptimized()) { | |
| 2238 | |
| 2239 if (only_at) { | |
| 2240 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
| 2241 // consists of comma or carriage return separated numbers so | |
| 2242 // search for the current bci in that string. | |
| 2243 address pc = fst.current()->pc(); | |
| 2244 nmethod* nm = (nmethod*) fst.current()->cb(); | |
| 2245 ScopeDesc* sd = nm->scope_desc_at( pc); | |
| 2246 char buffer[8]; | |
| 2247 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
| 2248 size_t len = strlen(buffer); | |
| 2249 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
| 2250 while (found != NULL) { | |
| 2251 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
| 2252 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
| 2253 // Check that the bci found is bracketed by terminators. | |
| 2254 break; | |
| 2255 } | |
| 2256 found = strstr(found + 1, buffer); | |
| 2257 } | |
| 2258 if (!found) { | |
| 2259 continue; | |
| 2260 } | |
| 2261 } | |
| 2262 | |
| 2263 if (DebugDeoptimization && !deopt) { | |
| 2264 deopt = true; // One-time only print before deopt | |
| 2265 tty->print_cr("[BEFORE Deoptimization]"); | |
| 2266 trace_frames(); | |
| 2267 trace_stack(); | |
| 2268 } | |
| 2269 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
| 2270 } | |
| 2271 } | |
| 2272 | |
| 2273 if (DebugDeoptimization && deopt) { | |
| 2274 tty->print_cr("[AFTER Deoptimization]"); | |
| 2275 trace_frames(); | |
| 2276 } | |
| 2277 } | |
| 2278 | |
| 2279 | |
| 2280 // Make zombies | |
| 2281 void JavaThread::make_zombies() { | |
| 2282 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2283 if (fst.current()->can_be_deoptimized()) { | |
| 2284 // it is a Java nmethod | |
| 2285 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
| 2286 nm->make_not_entrant(); | |
| 2287 } | |
| 2288 } | |
| 2289 } | |
| 2290 #endif // PRODUCT | |
| 2291 | |
| 2292 | |
| 2293 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
| 2294 if (!has_last_Java_frame()) return; | |
| 2295 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
| 2296 StackFrameStream fst(this, UseBiasedLocking); | |
| 2297 for(; !fst.is_done(); fst.next()) { | |
| 2298 if (fst.current()->should_be_deoptimized()) { | |
| 2299 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
| 2300 } | |
| 2301 } | |
| 2302 } | |
| 2303 | |
| 2304 | |
| 2305 // GC support | |
| 2306 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
| 2307 | |
| 2308 void JavaThread::gc_epilogue() { | |
| 2309 frames_do(frame_gc_epilogue); | |
| 2310 } | |
| 2311 | |
| 2312 | |
| 2313 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
| 2314 | |
| 2315 void JavaThread::gc_prologue() { | |
| 2316 frames_do(frame_gc_prologue); | |
| 2317 } | |
| 2318 | |
| 2319 | |
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2320 void JavaThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 2321 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
| 2322 // since there may be more than one thread using each ThreadProfiler. | |
| 2323 | |
| 2324 // Traverse the GCHandles | |
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2325 Thread::oops_do(f, cf); |
| 0 | 2326 |
| 2327 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2328 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2329 | |
| 2330 if (has_last_Java_frame()) { | |
| 2331 | |
| 2332 // Traverse the privileged stack | |
| 2333 if (_privileged_stack_top != NULL) { | |
| 2334 _privileged_stack_top->oops_do(f); | |
| 2335 } | |
| 2336 | |
| 2337 // traverse the registered growable array | |
| 2338 if (_array_for_gc != NULL) { | |
| 2339 for (int index = 0; index < _array_for_gc->length(); index++) { | |
| 2340 f->do_oop(_array_for_gc->adr_at(index)); | |
| 2341 } | |
| 2342 } | |
| 2343 | |
| 2344 // Traverse the monitor chunks | |
| 2345 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
| 2346 chunk->oops_do(f); | |
| 2347 } | |
| 2348 | |
| 2349 // Traverse the execution stack | |
| 2350 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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2351 fst.current()->oops_do(f, cf, fst.register_map()); |
| 0 | 2352 } |
| 2353 } | |
| 2354 | |
| 2355 // callee_target is never live across a gc point so NULL it here should | |
| 2356 // it still contain a methdOop. | |
| 2357 | |
| 2358 set_callee_target(NULL); | |
| 2359 | |
| 2360 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
| 2361 // If we have deferred set_locals there might be oops waiting to be | |
| 2362 // written | |
| 2363 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
| 2364 if (list != NULL) { | |
| 2365 for (int i = 0; i < list->length(); i++) { | |
| 2366 list->at(i)->oops_do(f); | |
| 2367 } | |
| 2368 } | |
| 2369 | |
| 2370 // Traverse instance variables at the end since the GC may be moving things | |
| 2371 // around using this function | |
| 2372 f->do_oop((oop*) &_threadObj); | |
| 2373 f->do_oop((oop*) &_vm_result); | |
| 2374 f->do_oop((oop*) &_vm_result_2); | |
| 2375 f->do_oop((oop*) &_exception_oop); | |
| 2376 f->do_oop((oop*) &_pending_async_exception); | |
| 2377 | |
| 2378 if (jvmti_thread_state() != NULL) { | |
| 2379 jvmti_thread_state()->oops_do(f); | |
| 2380 } | |
| 2381 } | |
| 2382 | |
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2383 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
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2384 Thread::nmethods_do(cf); // (super method is a no-op) |
| 0 | 2385 |
| 2386 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
| 2387 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
| 2388 | |
| 2389 if (has_last_Java_frame()) { | |
| 2390 // Traverse the execution stack | |
| 2391 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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2392 fst.current()->nmethods_do(cf); |
| 0 | 2393 } |
| 2394 } | |
| 2395 } | |
| 2396 | |
| 2397 // Printing | |
| 2398 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
| 2399 switch (_thread_state) { | |
| 2400 case _thread_uninitialized: return "_thread_uninitialized"; | |
| 2401 case _thread_new: return "_thread_new"; | |
| 2402 case _thread_new_trans: return "_thread_new_trans"; | |
| 2403 case _thread_in_native: return "_thread_in_native"; | |
| 2404 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
| 2405 case _thread_in_vm: return "_thread_in_vm"; | |
| 2406 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
| 2407 case _thread_in_Java: return "_thread_in_Java"; | |
| 2408 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
| 2409 case _thread_blocked: return "_thread_blocked"; | |
| 2410 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
| 2411 default: return "unknown thread state"; | |
| 2412 } | |
| 2413 } | |
| 2414 | |
| 2415 #ifndef PRODUCT | |
| 2416 void JavaThread::print_thread_state_on(outputStream *st) const { | |
| 2417 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
| 2418 }; | |
| 2419 void JavaThread::print_thread_state() const { | |
| 2420 print_thread_state_on(tty); | |
| 2421 }; | |
| 2422 #endif // PRODUCT | |
| 2423 | |
| 2424 // Called by Threads::print() for VM_PrintThreads operation | |
| 2425 void JavaThread::print_on(outputStream *st) const { | |
| 2426 st->print("\"%s\" ", get_thread_name()); | |
| 2427 oop thread_oop = threadObj(); | |
| 2428 if (thread_oop != NULL && java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
| 2429 Thread::print_on(st); | |
| 2430 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
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2431 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
| 0 | 2432 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
| 2433 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
| 2434 } | |
| 2435 #ifndef PRODUCT | |
| 2436 print_thread_state_on(st); | |
| 2437 _safepoint_state->print_on(st); | |
| 2438 #endif // PRODUCT | |
| 2439 } | |
| 2440 | |
| 2441 // Called by fatal error handler. The difference between this and | |
| 2442 // JavaThread::print() is that we can't grab lock or allocate memory. | |
| 2443 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
| 2444 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
| 2445 oop thread_obj = threadObj(); | |
| 2446 if (thread_obj != NULL) { | |
| 2447 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
| 2448 } | |
| 2449 st->print(" ["); | |
| 2450 st->print("%s", _get_thread_state_name(_thread_state)); | |
| 2451 if (osthread()) { | |
| 2452 st->print(", id=%d", osthread()->thread_id()); | |
| 2453 } | |
| 2454 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
| 2455 _stack_base - _stack_size, _stack_base); | |
| 2456 st->print("]"); | |
| 2457 return; | |
| 2458 } | |
| 2459 | |
| 2460 // Verification | |
| 2461 | |
| 2462 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
| 2463 | |
| 2464 void JavaThread::verify() { | |
| 2465 // Verify oops in the thread. | |
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2466 oops_do(&VerifyOopClosure::verify_oop, NULL); |
| 0 | 2467 |
| 2468 // Verify the stack frames. | |
| 2469 frames_do(frame_verify); | |
| 2470 } | |
| 2471 | |
| 2472 // CR 6300358 (sub-CR 2137150) | |
| 2473 // Most callers of this method assume that it can't return NULL but a | |
| 2474 // thread may not have a name whilst it is in the process of attaching to | |
| 2475 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
| 2476 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
| 2477 // if vm exit occurs during initialization). These cases can all be accounted | |
| 2478 // for such that this method never returns NULL. | |
| 2479 const char* JavaThread::get_thread_name() const { | |
| 2480 #ifdef ASSERT | |
| 2481 // early safepoints can hit while current thread does not yet have TLS | |
| 2482 if (!SafepointSynchronize::is_at_safepoint()) { | |
| 2483 Thread *cur = Thread::current(); | |
| 2484 if (!(cur->is_Java_thread() && cur == this)) { | |
| 2485 // Current JavaThreads are allowed to get their own name without | |
| 2486 // the Threads_lock. | |
| 2487 assert_locked_or_safepoint(Threads_lock); | |
| 2488 } | |
| 2489 } | |
| 2490 #endif // ASSERT | |
| 2491 return get_thread_name_string(); | |
| 2492 } | |
| 2493 | |
| 2494 // Returns a non-NULL representation of this thread's name, or a suitable | |
| 2495 // descriptive string if there is no set name | |
| 2496 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
| 2497 const char* name_str; | |
| 2498 oop thread_obj = threadObj(); | |
| 2499 if (thread_obj != NULL) { | |
| 2500 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
| 2501 if (name != NULL) { | |
| 2502 if (buf == NULL) { | |
| 2503 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2504 } | |
| 2505 else { | |
| 2506 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
| 2507 } | |
| 2508 } | |
| 2509 else if (is_attaching()) { // workaround for 6412693 - see 6404306 | |
| 2510 name_str = "<no-name - thread is attaching>"; | |
| 2511 } | |
| 2512 else { | |
| 2513 name_str = Thread::name(); | |
| 2514 } | |
| 2515 } | |
| 2516 else { | |
| 2517 name_str = Thread::name(); | |
| 2518 } | |
| 2519 assert(name_str != NULL, "unexpected NULL thread name"); | |
| 2520 return name_str; | |
| 2521 } | |
| 2522 | |
| 2523 | |
| 2524 const char* JavaThread::get_threadgroup_name() const { | |
| 2525 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2526 oop thread_obj = threadObj(); | |
| 2527 if (thread_obj != NULL) { | |
| 2528 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2529 if (thread_group != NULL) { | |
| 2530 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
| 2531 // ThreadGroup.name can be null | |
| 2532 if (name != NULL) { | |
| 2533 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2534 return str; | |
| 2535 } | |
| 2536 } | |
| 2537 } | |
| 2538 return NULL; | |
| 2539 } | |
| 2540 | |
| 2541 const char* JavaThread::get_parent_name() const { | |
| 2542 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
| 2543 oop thread_obj = threadObj(); | |
| 2544 if (thread_obj != NULL) { | |
| 2545 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
| 2546 if (thread_group != NULL) { | |
| 2547 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
| 2548 if (parent != NULL) { | |
| 2549 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
| 2550 // ThreadGroup.name can be null | |
| 2551 if (name != NULL) { | |
| 2552 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
| 2553 return str; | |
| 2554 } | |
| 2555 } | |
| 2556 } | |
| 2557 } | |
| 2558 return NULL; | |
| 2559 } | |
| 2560 | |
| 2561 ThreadPriority JavaThread::java_priority() const { | |
| 2562 oop thr_oop = threadObj(); | |
| 2563 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
| 2564 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
| 2565 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
| 2566 return priority; | |
| 2567 } | |
| 2568 | |
| 2569 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
| 2570 | |
| 2571 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
| 2572 // Link Java Thread object <-> C++ Thread | |
| 2573 | |
| 2574 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
| 2575 // and put it into a new Handle. The Handle "thread_oop" can then | |
| 2576 // be used to pass the C++ thread object to other methods. | |
| 2577 | |
| 2578 // Set the Java level thread object (jthread) field of the | |
| 2579 // new thread (a JavaThread *) to C++ thread object using the | |
| 2580 // "thread_oop" handle. | |
| 2581 | |
| 2582 // Set the thread field (a JavaThread *) of the | |
| 2583 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
| 2584 | |
| 2585 Handle thread_oop(Thread::current(), | |
| 2586 JNIHandles::resolve_non_null(jni_thread)); | |
| 2587 assert(instanceKlass::cast(thread_oop->klass())->is_linked(), | |
| 2588 "must be initialized"); | |
| 2589 set_threadObj(thread_oop()); | |
| 2590 java_lang_Thread::set_thread(thread_oop(), this); | |
| 2591 | |
| 2592 if (prio == NoPriority) { | |
| 2593 prio = java_lang_Thread::priority(thread_oop()); | |
| 2594 assert(prio != NoPriority, "A valid priority should be present"); | |
| 2595 } | |
| 2596 | |
| 2597 // Push the Java priority down to the native thread; needs Threads_lock | |
| 2598 Thread::set_priority(this, prio); | |
| 2599 | |
| 2600 // Add the new thread to the Threads list and set it in motion. | |
| 2601 // We must have threads lock in order to call Threads::add. | |
| 2602 // It is crucial that we do not block before the thread is | |
| 2603 // added to the Threads list for if a GC happens, then the java_thread oop | |
| 2604 // will not be visited by GC. | |
| 2605 Threads::add(this); | |
| 2606 } | |
| 2607 | |
| 2608 oop JavaThread::current_park_blocker() { | |
| 2609 // Support for JSR-166 locks | |
| 2610 oop thread_oop = threadObj(); | |
| 242 | 2611 if (thread_oop != NULL && |
| 2612 JDK_Version::current().supports_thread_park_blocker()) { | |
| 0 | 2613 return java_lang_Thread::park_blocker(thread_oop); |
| 2614 } | |
| 2615 return NULL; | |
| 2616 } | |
| 2617 | |
| 2618 | |
| 2619 void JavaThread::print_stack_on(outputStream* st) { | |
| 2620 if (!has_last_Java_frame()) return; | |
| 2621 ResourceMark rm; | |
| 2622 HandleMark hm; | |
| 2623 | |
| 2624 RegisterMap reg_map(this); | |
| 2625 vframe* start_vf = last_java_vframe(®_map); | |
| 2626 int count = 0; | |
| 2627 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 2628 if (f->is_java_frame()) { | |
| 2629 javaVFrame* jvf = javaVFrame::cast(f); | |
| 2630 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
| 2631 | |
| 2632 // Print out lock information | |
| 2633 if (JavaMonitorsInStackTrace) { | |
| 2634 jvf->print_lock_info_on(st, count); | |
| 2635 } | |
| 2636 } else { | |
| 2637 // Ignore non-Java frames | |
| 2638 } | |
| 2639 | |
| 2640 // Bail-out case for too deep stacks | |
| 2641 count++; | |
| 2642 if (MaxJavaStackTraceDepth == count) return; | |
| 2643 } | |
| 2644 } | |
| 2645 | |
| 2646 | |
| 2647 // JVMTI PopFrame support | |
| 2648 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
| 2649 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
| 2650 if (in_bytes(size_in_bytes) != 0) { | |
| 2651 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes)); | |
| 2652 _popframe_preserved_args_size = in_bytes(size_in_bytes); | |
| 2653 Copy::conjoint_bytes(start, _popframe_preserved_args, _popframe_preserved_args_size); | |
| 2654 } | |
| 2655 } | |
| 2656 | |
| 2657 void* JavaThread::popframe_preserved_args() { | |
| 2658 return _popframe_preserved_args; | |
| 2659 } | |
| 2660 | |
| 2661 ByteSize JavaThread::popframe_preserved_args_size() { | |
| 2662 return in_ByteSize(_popframe_preserved_args_size); | |
| 2663 } | |
| 2664 | |
| 2665 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
| 2666 int sz = in_bytes(popframe_preserved_args_size()); | |
| 2667 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
| 2668 return in_WordSize(sz / wordSize); | |
| 2669 } | |
| 2670 | |
| 2671 void JavaThread::popframe_free_preserved_args() { | |
| 2672 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
| 2673 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args); | |
| 2674 _popframe_preserved_args = NULL; | |
| 2675 _popframe_preserved_args_size = 0; | |
| 2676 } | |
| 2677 | |
| 2678 #ifndef PRODUCT | |
| 2679 | |
| 2680 void JavaThread::trace_frames() { | |
| 2681 tty->print_cr("[Describe stack]"); | |
| 2682 int frame_no = 1; | |
| 2683 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
| 2684 tty->print(" %d. ", frame_no++); | |
| 2685 fst.current()->print_value_on(tty,this); | |
| 2686 tty->cr(); | |
| 2687 } | |
| 2688 } | |
| 2689 | |
| 2690 | |
| 2691 void JavaThread::trace_stack_from(vframe* start_vf) { | |
| 2692 ResourceMark rm; | |
| 2693 int vframe_no = 1; | |
| 2694 for (vframe* f = start_vf; f; f = f->sender() ) { | |
| 2695 if (f->is_java_frame()) { | |
| 2696 javaVFrame::cast(f)->print_activation(vframe_no++); | |
| 2697 } else { | |
| 2698 f->print(); | |
| 2699 } | |
| 2700 if (vframe_no > StackPrintLimit) { | |
| 2701 tty->print_cr("...<more frames>..."); | |
| 2702 return; | |
| 2703 } | |
| 2704 } | |
| 2705 } | |
| 2706 | |
| 2707 | |
| 2708 void JavaThread::trace_stack() { | |
| 2709 if (!has_last_Java_frame()) return; | |
| 2710 ResourceMark rm; | |
| 2711 HandleMark hm; | |
| 2712 RegisterMap reg_map(this); | |
| 2713 trace_stack_from(last_java_vframe(®_map)); | |
| 2714 } | |
| 2715 | |
| 2716 | |
| 2717 #endif // PRODUCT | |
| 2718 | |
| 2719 | |
| 2720 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
| 2721 assert(reg_map != NULL, "a map must be given"); | |
| 2722 frame f = last_frame(); | |
| 2723 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
| 2724 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
| 2725 } | |
| 2726 return NULL; | |
| 2727 } | |
| 2728 | |
| 2729 | |
| 2730 klassOop JavaThread::security_get_caller_class(int depth) { | |
| 2731 vframeStream vfst(this); | |
| 2732 vfst.security_get_caller_frame(depth); | |
| 2733 if (!vfst.at_end()) { | |
| 2734 return vfst.method()->method_holder(); | |
| 2735 } | |
| 2736 return NULL; | |
| 2737 } | |
| 2738 | |
| 2739 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
| 2740 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
| 2741 CompileBroker::compiler_thread_loop(); | |
| 2742 } | |
| 2743 | |
| 2744 // Create a CompilerThread | |
| 2745 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
| 2746 : JavaThread(&compiler_thread_entry) { | |
| 2747 _env = NULL; | |
| 2748 _log = NULL; | |
| 2749 _task = NULL; | |
| 2750 _queue = queue; | |
| 2751 _counters = counters; | |
| 2752 | |
| 2753 #ifndef PRODUCT | |
| 2754 _ideal_graph_printer = NULL; | |
| 2755 #endif | |
| 2756 } | |
| 2757 | |
| 2758 | |
| 2759 // ======= Threads ======== | |
| 2760 | |
| 2761 // The Threads class links together all active threads, and provides | |
| 2762 // operations over all threads. It is protected by its own Mutex | |
| 2763 // lock, which is also used in other contexts to protect thread | |
| 2764 // operations from having the thread being operated on from exiting | |
| 2765 // and going away unexpectedly (e.g., safepoint synchronization) | |
| 2766 | |
| 2767 JavaThread* Threads::_thread_list = NULL; | |
| 2768 int Threads::_number_of_threads = 0; | |
| 2769 int Threads::_number_of_non_daemon_threads = 0; | |
| 2770 int Threads::_return_code = 0; | |
| 2771 size_t JavaThread::_stack_size_at_create = 0; | |
| 2772 | |
| 2773 // All JavaThreads | |
| 2774 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
| 2775 | |
| 2776 void os_stream(); | |
| 2777 | |
| 2778 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
| 2779 void Threads::threads_do(ThreadClosure* tc) { | |
| 2780 assert_locked_or_safepoint(Threads_lock); | |
| 2781 // ALL_JAVA_THREADS iterates through all JavaThreads | |
| 2782 ALL_JAVA_THREADS(p) { | |
| 2783 tc->do_thread(p); | |
| 2784 } | |
| 2785 // Someday we could have a table or list of all non-JavaThreads. | |
| 2786 // For now, just manually iterate through them. | |
| 2787 tc->do_thread(VMThread::vm_thread()); | |
| 2788 Universe::heap()->gc_threads_do(tc); | |
|
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2789 WatcherThread *wt = WatcherThread::watcher_thread(); |
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2790 // Strictly speaking, the following NULL check isn't sufficient to make sure |
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2791 // the data for WatcherThread is still valid upon being examined. However, |
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2792 // considering that WatchThread terminates when the VM is on the way to |
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2793 // exit at safepoint, the chance of the above is extremely small. The right |
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2794 // way to prevent termination of WatcherThread would be to acquire |
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2795 // Terminator_lock, but we can't do that without violating the lock rank |
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2796 // checking in some cases. |
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2797 if (wt != NULL) |
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2798 tc->do_thread(wt); |
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2799 |
| 0 | 2800 // If CompilerThreads ever become non-JavaThreads, add them here |
| 2801 } | |
| 2802 | |
| 2803 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
| 2804 | |
| 242 | 2805 extern void JDK_Version_init(); |
| 2806 | |
| 0 | 2807 // Check version |
| 2808 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
| 2809 | |
| 2810 // Initialize the output stream module | |
| 2811 ostream_init(); | |
| 2812 | |
| 2813 // Process java launcher properties. | |
| 2814 Arguments::process_sun_java_launcher_properties(args); | |
| 2815 | |
| 2816 // Initialize the os module before using TLS | |
| 2817 os::init(); | |
| 2818 | |
| 2819 // Initialize system properties. | |
| 2820 Arguments::init_system_properties(); | |
| 2821 | |
| 242 | 2822 // So that JDK version can be used as a discrimintor when parsing arguments |
| 2823 JDK_Version_init(); | |
| 2824 | |
| 0 | 2825 // Parse arguments |
| 2826 jint parse_result = Arguments::parse(args); | |
| 2827 if (parse_result != JNI_OK) return parse_result; | |
| 2828 | |
| 2829 if (PauseAtStartup) { | |
| 2830 os::pause(); | |
| 2831 } | |
| 2832 | |
| 2833 HS_DTRACE_PROBE(hotspot, vm__init__begin); | |
| 2834 | |
| 2835 // Record VM creation timing statistics | |
| 2836 TraceVmCreationTime create_vm_timer; | |
| 2837 create_vm_timer.start(); | |
| 2838 | |
| 2839 // Timing (must come after argument parsing) | |
| 2840 TraceTime timer("Create VM", TraceStartupTime); | |
| 2841 | |
| 2842 // Initialize the os module after parsing the args | |
| 2843 jint os_init_2_result = os::init_2(); | |
| 2844 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
| 2845 | |
| 2846 // Initialize output stream logging | |
| 2847 ostream_init_log(); | |
| 2848 | |
| 2849 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
| 2850 // Must be before create_vm_init_agents() | |
| 2851 if (Arguments::init_libraries_at_startup()) { | |
| 2852 convert_vm_init_libraries_to_agents(); | |
| 2853 } | |
| 2854 | |
| 2855 // Launch -agentlib/-agentpath and converted -Xrun agents | |
| 2856 if (Arguments::init_agents_at_startup()) { | |
| 2857 create_vm_init_agents(); | |
| 2858 } | |
| 2859 | |
| 2860 // Initialize Threads state | |
| 2861 _thread_list = NULL; | |
| 2862 _number_of_threads = 0; | |
| 2863 _number_of_non_daemon_threads = 0; | |
| 2864 | |
| 2865 // Initialize TLS | |
| 2866 ThreadLocalStorage::init(); | |
| 2867 | |
| 2868 // Initialize global data structures and create system classes in heap | |
| 2869 vm_init_globals(); | |
| 2870 | |
| 2871 // Attach the main thread to this os thread | |
| 2872 JavaThread* main_thread = new JavaThread(); | |
| 2873 main_thread->set_thread_state(_thread_in_vm); | |
| 2874 // must do this before set_active_handles and initialize_thread_local_storage | |
| 2875 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
| 2876 // change the stack size recorded here to one based on the java thread | |
| 2877 // stacksize. This adjusted size is what is used to figure the placement | |
| 2878 // of the guard pages. | |
| 2879 main_thread->record_stack_base_and_size(); | |
| 2880 main_thread->initialize_thread_local_storage(); | |
| 2881 | |
| 2882 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
| 2883 | |
| 2884 if (!main_thread->set_as_starting_thread()) { | |
| 2885 vm_shutdown_during_initialization( | |
| 2886 "Failed necessary internal allocation. Out of swap space"); | |
| 2887 delete main_thread; | |
| 2888 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 2889 return JNI_ENOMEM; | |
| 2890 } | |
| 2891 | |
| 2892 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
| 2893 // crash Linux VM, see notes in os_linux.cpp. | |
| 2894 main_thread->create_stack_guard_pages(); | |
| 2895 | |
| 2896 // Initialize Java-Leve synchronization subsystem | |
| 2897 ObjectSynchronizer::Initialize() ; | |
| 2898 | |
| 2899 // Initialize global modules | |
| 2900 jint status = init_globals(); | |
| 2901 if (status != JNI_OK) { | |
| 2902 delete main_thread; | |
| 2903 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
| 2904 return status; | |
| 2905 } | |
| 2906 | |
| 2907 HandleMark hm; | |
| 2908 | |
| 2909 { MutexLocker mu(Threads_lock); | |
| 2910 Threads::add(main_thread); | |
| 2911 } | |
| 2912 | |
| 2913 // Any JVMTI raw monitors entered in onload will transition into | |
| 2914 // real raw monitor. VM is setup enough here for raw monitor enter. | |
| 2915 JvmtiExport::transition_pending_onload_raw_monitors(); | |
| 2916 | |
| 2917 if (VerifyBeforeGC && | |
| 2918 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
| 2919 Universe::heap()->prepare_for_verify(); | |
| 2920 Universe::verify(); // make sure we're starting with a clean slate | |
| 2921 } | |
| 2922 | |
| 2923 // Create the VMThread | |
| 2924 { TraceTime timer("Start VMThread", TraceStartupTime); | |
| 2925 VMThread::create(); | |
| 2926 Thread* vmthread = VMThread::vm_thread(); | |
| 2927 | |
| 2928 if (!os::create_thread(vmthread, os::vm_thread)) | |
| 2929 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
| 2930 | |
| 2931 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
| 2932 // Monitors can have spurious returns, must always check another state flag | |
| 2933 { | |
| 2934 MutexLocker ml(Notify_lock); | |
| 2935 os::start_thread(vmthread); | |
| 2936 while (vmthread->active_handles() == NULL) { | |
| 2937 Notify_lock->wait(); | |
| 2938 } | |
| 2939 } | |
| 2940 } | |
| 2941 | |
| 2942 assert (Universe::is_fully_initialized(), "not initialized"); | |
| 2943 EXCEPTION_MARK; | |
| 2944 | |
| 2945 // At this point, the Universe is initialized, but we have not executed | |
| 2946 // any byte code. Now is a good time (the only time) to dump out the | |
| 2947 // internal state of the JVM for sharing. | |
| 2948 | |
| 2949 if (DumpSharedSpaces) { | |
| 2950 Universe::heap()->preload_and_dump(CHECK_0); | |
| 2951 ShouldNotReachHere(); | |
| 2952 } | |
| 2953 | |
| 2954 // Always call even when there are not JVMTI environments yet, since environments | |
| 2955 // may be attached late and JVMTI must track phases of VM execution | |
| 2956 JvmtiExport::enter_start_phase(); | |
| 2957 | |
| 2958 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
| 2959 JvmtiExport::post_vm_start(); | |
| 2960 | |
| 2961 { | |
| 2962 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
| 2963 | |
| 2964 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 2965 create_vm_init_libraries(); | |
| 2966 } | |
| 2967 | |
| 2968 if (InitializeJavaLangString) { | |
| 2969 initialize_class(vmSymbolHandles::java_lang_String(), CHECK_0); | |
| 2970 } else { | |
| 2971 warning("java.lang.String not initialized"); | |
| 2972 } | |
| 2973 | |
|
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2974 if (AggressiveOpts) { |
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2975 { |
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2976 // Forcibly initialize java/util/HashMap and mutate the private |
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2977 // static final "frontCacheEnabled" field before we start creating instances |
|
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2978 #ifdef ASSERT |
|
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2979 klassOop tmp_k = SystemDictionary::find(vmSymbolHandles::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
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2980 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
|
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2981 #endif |
|
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2982 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbolHandles::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
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2983 KlassHandle k = KlassHandle(THREAD, k_o); |
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2984 guarantee(k.not_null(), "Must find java/util/HashMap"); |
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2985 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
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2986 ik->initialize(CHECK_0); |
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2987 fieldDescriptor fd; |
|
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2988 // Possible we might not find this field; if so, don't break |
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2989 if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
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2990 k()->bool_field_put(fd.offset(), true); |
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2991 } |
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2992 } |
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2993 |
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2994 if (UseStringCache) { |
|
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2995 // Forcibly initialize java/lang/StringValue and mutate the private |
|
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2996 // static final "stringCacheEnabled" field before we start creating instances |
|
669
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2997 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbolHandles::java_lang_StringValue(), Handle(), Handle(), CHECK_0); |
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2998 // Possible that StringValue isn't present: if so, silently don't break |
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2999 if (k_o != NULL) { |
|
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3000 KlassHandle k = KlassHandle(THREAD, k_o); |
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3001 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
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3002 ik->initialize(CHECK_0); |
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3003 fieldDescriptor fd; |
|
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3004 // Possible we might not find this field: if so, silently don't break |
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3005 if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
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3006 k()->bool_field_put(fd.offset(), true); |
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3007 } |
|
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3008 } |
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3009 } |
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3010 } |
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|
3011 |
| 0 | 3012 // Initialize java_lang.System (needed before creating the thread) |
| 3013 if (InitializeJavaLangSystem) { | |
| 3014 initialize_class(vmSymbolHandles::java_lang_System(), CHECK_0); | |
| 3015 initialize_class(vmSymbolHandles::java_lang_ThreadGroup(), CHECK_0); | |
| 3016 Handle thread_group = create_initial_thread_group(CHECK_0); | |
| 3017 Universe::set_main_thread_group(thread_group()); | |
| 3018 initialize_class(vmSymbolHandles::java_lang_Thread(), CHECK_0); | |
| 3019 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); | |
| 3020 main_thread->set_threadObj(thread_object); | |
| 3021 // Set thread status to running since main thread has | |
| 3022 // been started and running. | |
| 3023 java_lang_Thread::set_thread_status(thread_object, | |
| 3024 java_lang_Thread::RUNNABLE); | |
| 3025 | |
| 3026 // The VM preresolve methods to these classes. Make sure that get initialized | |
| 3027 initialize_class(vmSymbolHandles::java_lang_reflect_Method(), CHECK_0); | |
| 3028 initialize_class(vmSymbolHandles::java_lang_ref_Finalizer(), CHECK_0); | |
| 3029 // The VM creates & returns objects of this class. Make sure it's initialized. | |
| 3030 initialize_class(vmSymbolHandles::java_lang_Class(), CHECK_0); | |
| 3031 call_initializeSystemClass(CHECK_0); | |
| 3032 } else { | |
| 3033 warning("java.lang.System not initialized"); | |
| 3034 } | |
| 3035 | |
| 3036 // an instance of OutOfMemory exception has been allocated earlier | |
| 3037 if (InitializeJavaLangExceptionsErrors) { | |
| 3038 initialize_class(vmSymbolHandles::java_lang_OutOfMemoryError(), CHECK_0); | |
| 3039 initialize_class(vmSymbolHandles::java_lang_NullPointerException(), CHECK_0); | |
| 3040 initialize_class(vmSymbolHandles::java_lang_ClassCastException(), CHECK_0); | |
| 3041 initialize_class(vmSymbolHandles::java_lang_ArrayStoreException(), CHECK_0); | |
| 3042 initialize_class(vmSymbolHandles::java_lang_ArithmeticException(), CHECK_0); | |
| 3043 initialize_class(vmSymbolHandles::java_lang_StackOverflowError(), CHECK_0); | |
| 3044 initialize_class(vmSymbolHandles::java_lang_IllegalMonitorStateException(), CHECK_0); | |
| 3045 } else { | |
| 3046 warning("java.lang.OutOfMemoryError has not been initialized"); | |
| 3047 warning("java.lang.NullPointerException has not been initialized"); | |
| 3048 warning("java.lang.ClassCastException has not been initialized"); | |
| 3049 warning("java.lang.ArrayStoreException has not been initialized"); | |
| 3050 warning("java.lang.ArithmeticException has not been initialized"); | |
| 3051 warning("java.lang.StackOverflowError has not been initialized"); | |
| 3052 } | |
| 3053 } | |
| 3054 | |
| 3055 // See : bugid 4211085. | |
| 3056 // Background : the static initializer of java.lang.Compiler tries to read | |
| 3057 // property"java.compiler" and read & write property "java.vm.info". | |
| 3058 // When a security manager is installed through the command line | |
| 3059 // option "-Djava.security.manager", the above properties are not | |
| 3060 // readable and the static initializer for java.lang.Compiler fails | |
| 3061 // resulting in a NoClassDefFoundError. This can happen in any | |
| 3062 // user code which calls methods in java.lang.Compiler. | |
| 3063 // Hack : the hack is to pre-load and initialize this class, so that only | |
| 3064 // system domains are on the stack when the properties are read. | |
| 3065 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
| 3066 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
| 3067 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
| 3068 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
| 3069 // Once that is done, we should remove this hack. | |
| 3070 initialize_class(vmSymbolHandles::java_lang_Compiler(), CHECK_0); | |
| 3071 | |
| 3072 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
| 3073 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
| 3074 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
| 3075 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
| 3076 // This should also be taken out as soon as 4211383 gets fixed. | |
| 3077 reset_vm_info_property(CHECK_0); | |
| 3078 | |
| 3079 quicken_jni_functions(); | |
| 3080 | |
| 3081 // Set flag that basic initialization has completed. Used by exceptions and various | |
| 3082 // debug stuff, that does not work until all basic classes have been initialized. | |
| 3083 set_init_completed(); | |
| 3084 | |
| 3085 HS_DTRACE_PROBE(hotspot, vm__init__end); | |
| 3086 | |
| 3087 // record VM initialization completion time | |
| 3088 Management::record_vm_init_completed(); | |
| 3089 | |
| 3090 // Compute system loader. Note that this has to occur after set_init_completed, since | |
| 3091 // valid exceptions may be thrown in the process. | |
| 3092 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
| 3093 // set_init_completed has just been called, causing exceptions not to be shortcut | |
| 3094 // anymore. We call vm_exit_during_initialization directly instead. | |
| 3095 SystemDictionary::compute_java_system_loader(THREAD); | |
| 3096 if (HAS_PENDING_EXCEPTION) { | |
| 3097 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3098 } | |
| 3099 | |
| 3100 #ifndef SERIALGC | |
| 3101 // Support for ConcurrentMarkSweep. This should be cleaned up | |
|
342
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3102 // and better encapsulated. The ugly nested if test would go away |
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3103 // once things are properly refactored. XXX YSR |
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3104 if (UseConcMarkSweepGC || UseG1GC) { |
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3105 if (UseConcMarkSweepGC) { |
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3106 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
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3107 } else { |
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3108 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
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3109 } |
| 0 | 3110 if (HAS_PENDING_EXCEPTION) { |
| 3111 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
| 3112 } | |
| 3113 } | |
| 3114 #endif // SERIALGC | |
| 3115 | |
| 3116 // Always call even when there are not JVMTI environments yet, since environments | |
| 3117 // may be attached late and JVMTI must track phases of VM execution | |
| 3118 JvmtiExport::enter_live_phase(); | |
| 3119 | |
| 3120 // Signal Dispatcher needs to be started before VMInit event is posted | |
| 3121 os::signal_init(); | |
| 3122 | |
| 3123 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
| 3124 if (!DisableAttachMechanism) { | |
| 3125 if (StartAttachListener || AttachListener::init_at_startup()) { | |
| 3126 AttachListener::init(); | |
| 3127 } | |
| 3128 } | |
| 3129 | |
| 3130 // Launch -Xrun agents | |
| 3131 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
| 3132 // back-end can launch with -Xdebug -Xrunjdwp. | |
| 3133 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
| 3134 create_vm_init_libraries(); | |
| 3135 } | |
| 3136 | |
| 3137 // Notify JVMTI agents that VM initialization is complete - nop if no agents. | |
| 3138 JvmtiExport::post_vm_initialized(); | |
| 3139 | |
| 3140 Chunk::start_chunk_pool_cleaner_task(); | |
| 3141 | |
| 3142 // initialize compiler(s) | |
| 3143 CompileBroker::compilation_init(); | |
| 3144 | |
| 3145 Management::initialize(THREAD); | |
| 3146 if (HAS_PENDING_EXCEPTION) { | |
| 3147 // management agent fails to start possibly due to | |
| 3148 // configuration problem and is responsible for printing | |
| 3149 // stack trace if appropriate. Simply exit VM. | |
| 3150 vm_exit(1); | |
| 3151 } | |
| 3152 | |
| 3153 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
| 3154 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
| 3155 if (MemProfiling) MemProfiler::engage(); | |
| 3156 StatSampler::engage(); | |
| 3157 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
| 3158 | |
| 3159 BiasedLocking::init(); | |
| 3160 | |
| 3161 | |
| 3162 // Start up the WatcherThread if there are any periodic tasks | |
| 3163 // NOTE: All PeriodicTasks should be registered by now. If they | |
| 3164 // aren't, late joiners might appear to start slowly (we might | |
| 3165 // take a while to process their first tick). | |
| 3166 if (PeriodicTask::num_tasks() > 0) { | |
| 3167 WatcherThread::start(); | |
| 3168 } | |
| 3169 | |
| 3170 create_vm_timer.end(); | |
| 3171 return JNI_OK; | |
| 3172 } | |
| 3173 | |
| 3174 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
| 3175 extern "C" { | |
| 3176 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
| 3177 } | |
| 3178 // Find a command line agent library and return its entry point for | |
| 3179 // -agentlib: -agentpath: -Xrun | |
| 3180 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
| 3181 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
| 3182 OnLoadEntry_t on_load_entry = NULL; | |
| 3183 void *library = agent->os_lib(); // check if we have looked it up before | |
| 3184 | |
| 3185 if (library == NULL) { | |
| 3186 char buffer[JVM_MAXPATHLEN]; | |
| 3187 char ebuf[1024]; | |
| 3188 const char *name = agent->name(); | |
| 3189 | |
| 3190 if (agent->is_absolute_path()) { | |
| 3191 library = hpi::dll_load(name, ebuf, sizeof ebuf); | |
| 3192 if (library == NULL) { | |
| 3193 // If we can't find the agent, exit. | |
| 3194 vm_exit_during_initialization("Could not find agent library in absolute path", name); | |
| 3195 } | |
| 3196 } else { | |
| 3197 // Try to load the agent from the standard dll directory | |
| 3198 hpi::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), name); | |
| 3199 library = hpi::dll_load(buffer, ebuf, sizeof ebuf); | |
| 3200 #ifdef KERNEL | |
| 3201 // Download instrument dll | |
| 3202 if (library == NULL && strcmp(name, "instrument") == 0) { | |
| 3203 char *props = Arguments::get_kernel_properties(); | |
| 3204 char *home = Arguments::get_java_home(); | |
| 3205 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
| 3206 " sun.jkernel.DownloadManager -download client_jvm"; | |
| 3207 int length = strlen(props) + strlen(home) + strlen(fmt) + 1; | |
| 3208 char *cmd = AllocateHeap(length); | |
| 3209 jio_snprintf(cmd, length, fmt, home, props); | |
| 3210 int status = os::fork_and_exec(cmd); | |
| 3211 FreeHeap(props); | |
| 3212 FreeHeap(cmd); | |
| 3213 if (status == -1) { | |
| 3214 warning(cmd); | |
| 3215 vm_exit_during_initialization("fork_and_exec failed: %s", | |
| 3216 strerror(errno)); | |
| 3217 } | |
| 3218 // when this comes back the instrument.dll should be where it belongs. | |
| 3219 library = hpi::dll_load(buffer, ebuf, sizeof ebuf); | |
| 3220 } | |
| 3221 #endif // KERNEL | |
| 3222 if (library == NULL) { // Try the local directory | |
| 3223 char ns[1] = {0}; | |
| 3224 hpi::dll_build_name(buffer, sizeof(buffer), ns, name); | |
| 3225 library = hpi::dll_load(buffer, ebuf, sizeof ebuf); | |
| 3226 if (library == NULL) { | |
| 3227 // If we can't find the agent, exit. | |
| 3228 vm_exit_during_initialization("Could not find agent library on the library path or in the local directory", name); | |
| 3229 } | |
| 3230 } | |
| 3231 } | |
| 3232 agent->set_os_lib(library); | |
| 3233 } | |
| 3234 | |
| 3235 // Find the OnLoad function. | |
| 3236 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
| 3237 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, hpi::dll_lookup(library, on_load_symbols[symbol_index])); | |
| 3238 if (on_load_entry != NULL) break; | |
| 3239 } | |
| 3240 return on_load_entry; | |
| 3241 } | |
| 3242 | |
| 3243 // Find the JVM_OnLoad entry point | |
| 3244 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
| 3245 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
| 3246 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3247 } | |
| 3248 | |
| 3249 // Find the Agent_OnLoad entry point | |
| 3250 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
| 3251 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
| 3252 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
| 3253 } | |
| 3254 | |
| 3255 // For backwards compatibility with -Xrun | |
| 3256 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
| 3257 // treated like -agentpath: | |
| 3258 // Must be called before agent libraries are created | |
| 3259 void Threads::convert_vm_init_libraries_to_agents() { | |
| 3260 AgentLibrary* agent; | |
| 3261 AgentLibrary* next; | |
| 3262 | |
| 3263 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
| 3264 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
| 3265 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3266 | |
| 3267 // If there is an JVM_OnLoad function it will get called later, | |
| 3268 // otherwise see if there is an Agent_OnLoad | |
| 3269 if (on_load_entry == NULL) { | |
| 3270 on_load_entry = lookup_agent_on_load(agent); | |
| 3271 if (on_load_entry != NULL) { | |
| 3272 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
| 3273 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
| 3274 Arguments::convert_library_to_agent(agent); | |
| 3275 } else { | |
| 3276 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
| 3277 } | |
| 3278 } | |
| 3279 } | |
| 3280 } | |
| 3281 | |
| 3282 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
| 3283 // Invokes Agent_OnLoad | |
| 3284 // Called very early -- before JavaThreads exist | |
| 3285 void Threads::create_vm_init_agents() { | |
| 3286 extern struct JavaVM_ main_vm; | |
| 3287 AgentLibrary* agent; | |
| 3288 | |
| 3289 JvmtiExport::enter_onload_phase(); | |
| 3290 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
| 3291 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
| 3292 | |
| 3293 if (on_load_entry != NULL) { | |
| 3294 // Invoke the Agent_OnLoad function | |
| 3295 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3296 if (err != JNI_OK) { | |
| 3297 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
| 3298 } | |
| 3299 } else { | |
| 3300 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
| 3301 } | |
| 3302 } | |
| 3303 JvmtiExport::enter_primordial_phase(); | |
| 3304 } | |
| 3305 | |
| 3306 extern "C" { | |
| 3307 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
| 3308 } | |
| 3309 | |
| 3310 void Threads::shutdown_vm_agents() { | |
| 3311 // Send any Agent_OnUnload notifications | |
| 3312 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
| 3313 extern struct JavaVM_ main_vm; | |
| 3314 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
| 3315 | |
| 3316 // Find the Agent_OnUnload function. | |
| 3317 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
| 3318 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
| 3319 hpi::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); | |
| 3320 | |
| 3321 // Invoke the Agent_OnUnload function | |
| 3322 if (unload_entry != NULL) { | |
| 3323 JavaThread* thread = JavaThread::current(); | |
| 3324 ThreadToNativeFromVM ttn(thread); | |
| 3325 HandleMark hm(thread); | |
| 3326 (*unload_entry)(&main_vm); | |
| 3327 break; | |
| 3328 } | |
| 3329 } | |
| 3330 } | |
| 3331 } | |
| 3332 | |
| 3333 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
| 3334 // Invokes JVM_OnLoad | |
| 3335 void Threads::create_vm_init_libraries() { | |
| 3336 extern struct JavaVM_ main_vm; | |
| 3337 AgentLibrary* agent; | |
| 3338 | |
| 3339 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
| 3340 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
| 3341 | |
| 3342 if (on_load_entry != NULL) { | |
| 3343 // Invoke the JVM_OnLoad function | |
| 3344 JavaThread* thread = JavaThread::current(); | |
| 3345 ThreadToNativeFromVM ttn(thread); | |
| 3346 HandleMark hm(thread); | |
| 3347 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
| 3348 if (err != JNI_OK) { | |
| 3349 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
| 3350 } | |
| 3351 } else { | |
| 3352 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
| 3353 } | |
| 3354 } | |
| 3355 } | |
| 3356 | |
| 3357 // Last thread running calls java.lang.Shutdown.shutdown() | |
| 3358 void JavaThread::invoke_shutdown_hooks() { | |
| 3359 HandleMark hm(this); | |
| 3360 | |
| 3361 // We could get here with a pending exception, if so clear it now. | |
| 3362 if (this->has_pending_exception()) { | |
| 3363 this->clear_pending_exception(); | |
| 3364 } | |
| 3365 | |
| 3366 EXCEPTION_MARK; | |
| 3367 klassOop k = | |
| 3368 SystemDictionary::resolve_or_null(vmSymbolHandles::java_lang_Shutdown(), | |
| 3369 THREAD); | |
| 3370 if (k != NULL) { | |
| 3371 // SystemDictionary::resolve_or_null will return null if there was | |
| 3372 // an exception. If we cannot load the Shutdown class, just don't | |
| 3373 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
| 3374 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
| 3375 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
| 3376 // was called, the Shutdown class would have already been loaded | |
| 3377 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
| 3378 instanceKlassHandle shutdown_klass (THREAD, k); | |
| 3379 JavaValue result(T_VOID); | |
| 3380 JavaCalls::call_static(&result, | |
| 3381 shutdown_klass, | |
| 3382 vmSymbolHandles::shutdown_method_name(), | |
| 3383 vmSymbolHandles::void_method_signature(), | |
| 3384 THREAD); | |
| 3385 } | |
| 3386 CLEAR_PENDING_EXCEPTION; | |
| 3387 } | |
| 3388 | |
| 3389 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
| 3390 // the program falls off the end of main(). Another VM exit path is through | |
| 3391 // vm_exit() when the program calls System.exit() to return a value or when | |
| 3392 // there is a serious error in VM. The two shutdown paths are not exactly | |
| 3393 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
| 3394 // and VM_Exit op at VM level. | |
| 3395 // | |
| 3396 // Shutdown sequence: | |
| 3397 // + Wait until we are the last non-daemon thread to execute | |
| 3398 // <-- every thing is still working at this moment --> | |
| 3399 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
| 3400 // shutdown hooks, run finalizers if finalization-on-exit | |
| 3401 // + Call before_exit(), prepare for VM exit | |
| 3402 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
| 3403 // currently the only user of this mechanism is File.deleteOnExit()) | |
| 3404 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
| 3405 // post thread end and vm death events to JVMTI, | |
| 3406 // stop signal thread | |
| 3407 // + Call JavaThread::exit(), it will: | |
| 3408 // > release JNI handle blocks, remove stack guard pages | |
| 3409 // > remove this thread from Threads list | |
| 3410 // <-- no more Java code from this thread after this point --> | |
| 3411 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
| 3412 // the compiler threads at safepoint | |
| 3413 // <-- do not use anything that could get blocked by Safepoint --> | |
| 3414 // + Disable tracing at JNI/JVM barriers | |
| 3415 // + Set _vm_exited flag for threads that are still running native code | |
| 3416 // + Delete this thread | |
| 3417 // + Call exit_globals() | |
| 3418 // > deletes tty | |
| 3419 // > deletes PerfMemory resources | |
| 3420 // + Return to caller | |
| 3421 | |
| 3422 bool Threads::destroy_vm() { | |
| 3423 JavaThread* thread = JavaThread::current(); | |
| 3424 | |
| 3425 // Wait until we are the last non-daemon thread to execute | |
| 3426 { MutexLocker nu(Threads_lock); | |
| 3427 while (Threads::number_of_non_daemon_threads() > 1 ) | |
| 3428 // This wait should make safepoint checks, wait without a timeout, | |
| 3429 // and wait as a suspend-equivalent condition. | |
| 3430 // | |
| 3431 // Note: If the FlatProfiler is running and this thread is waiting | |
| 3432 // for another non-daemon thread to finish, then the FlatProfiler | |
| 3433 // is waiting for the external suspend request on this thread to | |
| 3434 // complete. wait_for_ext_suspend_completion() will eventually | |
| 3435 // timeout, but that takes time. Making this wait a suspend- | |
| 3436 // equivalent condition solves that timeout problem. | |
| 3437 // | |
| 3438 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
| 3439 Mutex::_as_suspend_equivalent_flag); | |
| 3440 } | |
| 3441 | |
| 3442 // Hang forever on exit if we are reporting an error. | |
| 3443 if (ShowMessageBoxOnError && is_error_reported()) { | |
| 3444 os::infinite_sleep(); | |
| 3445 } | |
| 3446 | |
| 3447 if (JDK_Version::is_jdk12x_version()) { | |
| 3448 // We are the last thread running, so check if finalizers should be run. | |
| 3449 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
| 3450 HandleMark rm(thread); | |
| 3451 Universe::run_finalizers_on_exit(); | |
| 3452 } else { | |
| 3453 // run Java level shutdown hooks | |
| 3454 thread->invoke_shutdown_hooks(); | |
| 3455 } | |
| 3456 | |
| 3457 before_exit(thread); | |
| 3458 | |
| 3459 thread->exit(true); | |
| 3460 | |
| 3461 // Stop VM thread. | |
| 3462 { | |
| 3463 // 4945125 The vm thread comes to a safepoint during exit. | |
| 3464 // GC vm_operations can get caught at the safepoint, and the | |
| 3465 // heap is unparseable if they are caught. Grab the Heap_lock | |
| 3466 // to prevent this. The GC vm_operations will not be able to | |
| 3467 // queue until after the vm thread is dead. | |
| 3468 MutexLocker ml(Heap_lock); | |
| 3469 | |
| 3470 VMThread::wait_for_vm_thread_exit(); | |
| 3471 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
| 3472 VMThread::destroy(); | |
| 3473 } | |
| 3474 | |
| 3475 // clean up ideal graph printers | |
| 3476 #if defined(COMPILER2) && !defined(PRODUCT) | |
| 3477 IdealGraphPrinter::clean_up(); | |
| 3478 #endif | |
| 3479 | |
| 3480 // Now, all Java threads are gone except daemon threads. Daemon threads | |
| 3481 // running Java code or in VM are stopped by the Safepoint. However, | |
| 3482 // daemon threads executing native code are still running. But they | |
| 3483 // will be stopped at native=>Java/VM barriers. Note that we can't | |
| 3484 // simply kill or suspend them, as it is inherently deadlock-prone. | |
| 3485 | |
| 3486 #ifndef PRODUCT | |
| 3487 // disable function tracing at JNI/JVM barriers | |
| 3488 TraceHPI = false; | |
| 3489 TraceJNICalls = false; | |
| 3490 TraceJVMCalls = false; | |
| 3491 TraceRuntimeCalls = false; | |
| 3492 #endif | |
| 3493 | |
| 3494 VM_Exit::set_vm_exited(); | |
| 3495 | |
| 3496 notify_vm_shutdown(); | |
| 3497 | |
| 3498 delete thread; | |
| 3499 | |
| 3500 // exit_globals() will delete tty | |
| 3501 exit_globals(); | |
| 3502 | |
| 3503 return true; | |
| 3504 } | |
| 3505 | |
| 3506 | |
| 3507 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
| 3508 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
| 3509 return is_supported_jni_version(version); | |
| 3510 } | |
| 3511 | |
| 3512 | |
| 3513 jboolean Threads::is_supported_jni_version(jint version) { | |
| 3514 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
| 3515 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
| 3516 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
| 3517 return JNI_FALSE; | |
| 3518 } | |
| 3519 | |
| 3520 | |
| 3521 void Threads::add(JavaThread* p, bool force_daemon) { | |
| 3522 // The threads lock must be owned at this point | |
| 3523 assert_locked_or_safepoint(Threads_lock); | |
| 3524 p->set_next(_thread_list); | |
| 3525 _thread_list = p; | |
| 3526 _number_of_threads++; | |
| 3527 oop threadObj = p->threadObj(); | |
| 3528 bool daemon = true; | |
| 3529 // Bootstrapping problem: threadObj can be null for initial | |
| 3530 // JavaThread (or for threads attached via JNI) | |
| 3531 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
| 3532 _number_of_non_daemon_threads++; | |
| 3533 daemon = false; | |
| 3534 } | |
| 3535 | |
| 3536 ThreadService::add_thread(p, daemon); | |
| 3537 | |
| 3538 // Possible GC point. | |
| 3539 Events::log("Thread added: " INTPTR_FORMAT, p); | |
| 3540 } | |
| 3541 | |
| 3542 void Threads::remove(JavaThread* p) { | |
| 3543 // Extra scope needed for Thread_lock, so we can check | |
| 3544 // that we do not remove thread without safepoint code notice | |
| 3545 { MutexLocker ml(Threads_lock); | |
| 3546 | |
| 3547 assert(includes(p), "p must be present"); | |
| 3548 | |
| 3549 JavaThread* current = _thread_list; | |
| 3550 JavaThread* prev = NULL; | |
| 3551 | |
| 3552 while (current != p) { | |
| 3553 prev = current; | |
| 3554 current = current->next(); | |
| 3555 } | |
| 3556 | |
| 3557 if (prev) { | |
| 3558 prev->set_next(current->next()); | |
| 3559 } else { | |
| 3560 _thread_list = p->next(); | |
| 3561 } | |
| 3562 _number_of_threads--; | |
| 3563 oop threadObj = p->threadObj(); | |
| 3564 bool daemon = true; | |
| 3565 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
| 3566 _number_of_non_daemon_threads--; | |
| 3567 daemon = false; | |
| 3568 | |
| 3569 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
| 3570 // on destroy_vm will wake up. | |
| 3571 if (number_of_non_daemon_threads() == 1) | |
| 3572 Threads_lock->notify_all(); | |
| 3573 } | |
| 3574 ThreadService::remove_thread(p, daemon); | |
| 3575 | |
| 3576 // Make sure that safepoint code disregard this thread. This is needed since | |
| 3577 // the thread might mess around with locks after this point. This can cause it | |
| 3578 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
| 3579 // of this thread since it is removed from the queue. | |
| 3580 p->set_terminated_value(); | |
| 3581 } // unlock Threads_lock | |
| 3582 | |
| 3583 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
| 3584 Events::log("Thread exited: " INTPTR_FORMAT, p); | |
| 3585 } | |
| 3586 | |
| 3587 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
| 3588 bool Threads::includes(JavaThread* p) { | |
| 3589 assert(Threads_lock->is_locked(), "sanity check"); | |
| 3590 ALL_JAVA_THREADS(q) { | |
| 3591 if (q == p ) { | |
| 3592 return true; | |
| 3593 } | |
| 3594 } | |
| 3595 return false; | |
| 3596 } | |
| 3597 | |
| 3598 // Operations on the Threads list for GC. These are not explicitly locked, | |
| 3599 // but the garbage collector must provide a safe context for them to run. | |
| 3600 // In particular, these things should never be called when the Threads_lock | |
| 3601 // is held by some other thread. (Note: the Safepoint abstraction also | |
| 3602 // uses the Threads_lock to gurantee this property. It also makes sure that | |
| 3603 // all threads gets blocked when exiting or starting). | |
| 3604 | |
|
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|
3605 void Threads::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 3606 ALL_JAVA_THREADS(p) { |
|
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changeset
|
3607 p->oops_do(f, cf); |
| 0 | 3608 } |
|
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changeset
|
3609 VMThread::vm_thread()->oops_do(f, cf); |
| 0 | 3610 } |
| 3611 | |
|
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|
3612 void Threads::possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf) { |
| 0 | 3613 // Introduce a mechanism allowing parallel threads to claim threads as |
| 3614 // root groups. Overhead should be small enough to use all the time, | |
| 3615 // even in sequential code. | |
| 3616 SharedHeap* sh = SharedHeap::heap(); | |
| 3617 bool is_par = (sh->n_par_threads() > 0); | |
| 3618 int cp = SharedHeap::heap()->strong_roots_parity(); | |
| 3619 ALL_JAVA_THREADS(p) { | |
| 3620 if (p->claim_oops_do(is_par, cp)) { | |
|
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changeset
|
3621 p->oops_do(f, cf); |
| 0 | 3622 } |
| 3623 } | |
| 3624 VMThread* vmt = VMThread::vm_thread(); | |
| 3625 if (vmt->claim_oops_do(is_par, cp)) | |
|
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changeset
|
3626 vmt->oops_do(f, cf); |
| 0 | 3627 } |
| 3628 | |
| 3629 #ifndef SERIALGC | |
| 3630 // Used by ParallelScavenge | |
| 3631 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
| 3632 ALL_JAVA_THREADS(p) { | |
| 3633 q->enqueue(new ThreadRootsTask(p)); | |
| 3634 } | |
| 3635 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
| 3636 } | |
| 3637 | |
| 3638 // Used by Parallel Old | |
| 3639 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
| 3640 ALL_JAVA_THREADS(p) { | |
| 3641 q->enqueue(new ThreadRootsMarkingTask(p)); | |
| 3642 } | |
| 3643 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
| 3644 } | |
| 3645 #endif // SERIALGC | |
| 3646 | |
|
989
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changeset
|
3647 void Threads::nmethods_do(CodeBlobClosure* cf) { |
| 0 | 3648 ALL_JAVA_THREADS(p) { |
|
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diff
changeset
|
3649 p->nmethods_do(cf); |
| 0 | 3650 } |
|
989
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changeset
|
3651 VMThread::vm_thread()->nmethods_do(cf); |
| 0 | 3652 } |
| 3653 | |
| 3654 void Threads::gc_epilogue() { | |
| 3655 ALL_JAVA_THREADS(p) { | |
| 3656 p->gc_epilogue(); | |
| 3657 } | |
| 3658 } | |
| 3659 | |
| 3660 void Threads::gc_prologue() { | |
| 3661 ALL_JAVA_THREADS(p) { | |
| 3662 p->gc_prologue(); | |
| 3663 } | |
| 3664 } | |
| 3665 | |
| 3666 void Threads::deoptimized_wrt_marked_nmethods() { | |
| 3667 ALL_JAVA_THREADS(p) { | |
| 3668 p->deoptimized_wrt_marked_nmethods(); | |
| 3669 } | |
| 3670 } | |
| 3671 | |
| 3672 | |
| 3673 // Get count Java threads that are waiting to enter the specified monitor. | |
| 3674 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
| 3675 address monitor, bool doLock) { | |
| 3676 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
| 3677 "must grab Threads_lock or be at safepoint"); | |
| 3678 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
| 3679 | |
| 3680 int i = 0; | |
| 3681 { | |
| 3682 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 3683 ALL_JAVA_THREADS(p) { | |
| 3684 if (p->is_Compiler_thread()) continue; | |
| 3685 | |
| 3686 address pending = (address)p->current_pending_monitor(); | |
| 3687 if (pending == monitor) { // found a match | |
| 3688 if (i < count) result->append(p); // save the first count matches | |
| 3689 i++; | |
| 3690 } | |
| 3691 } | |
| 3692 } | |
| 3693 return result; | |
| 3694 } | |
| 3695 | |
| 3696 | |
| 3697 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
| 3698 assert(doLock || | |
| 3699 Threads_lock->owned_by_self() || | |
| 3700 SafepointSynchronize::is_at_safepoint(), | |
| 3701 "must grab Threads_lock or be at safepoint"); | |
| 3702 | |
| 3703 // NULL owner means not locked so we can skip the search | |
| 3704 if (owner == NULL) return NULL; | |
| 3705 | |
| 3706 { | |
| 3707 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 3708 ALL_JAVA_THREADS(p) { | |
| 3709 // first, see if owner is the address of a Java thread | |
| 3710 if (owner == (address)p) return p; | |
| 3711 } | |
| 3712 } | |
| 3713 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
| 3714 if (UseHeavyMonitors) return NULL; | |
| 3715 | |
| 3716 // | |
| 3717 // If we didn't find a matching Java thread and we didn't force use of | |
| 3718 // heavyweight monitors, then the owner is the stack address of the | |
| 3719 // Lock Word in the owning Java thread's stack. | |
| 3720 // | |
| 3721 JavaThread* the_owner = NULL; | |
| 3722 { | |
| 3723 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
| 3724 ALL_JAVA_THREADS(q) { | |
|
702
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6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
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669
diff
changeset
|
3725 if (q->is_lock_owned(owner)) { |
| 0 | 3726 the_owner = q; |
|
702
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xlu
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669
diff
changeset
|
3727 break; |
| 0 | 3728 } |
| 3729 } | |
| 3730 } | |
| 3731 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
| 3732 return the_owner; | |
| 3733 } | |
| 3734 | |
| 3735 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
| 3736 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
| 3737 char buf[32]; | |
| 3738 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
| 3739 | |
| 3740 st->print_cr("Full thread dump %s (%s %s):", | |
| 3741 Abstract_VM_Version::vm_name(), | |
| 3742 Abstract_VM_Version::vm_release(), | |
| 3743 Abstract_VM_Version::vm_info_string() | |
| 3744 ); | |
| 3745 st->cr(); | |
| 3746 | |
| 3747 #ifndef SERIALGC | |
| 3748 // Dump concurrent locks | |
| 3749 ConcurrentLocksDump concurrent_locks; | |
| 3750 if (print_concurrent_locks) { | |
| 3751 concurrent_locks.dump_at_safepoint(); | |
| 3752 } | |
| 3753 #endif // SERIALGC | |
| 3754 | |
| 3755 ALL_JAVA_THREADS(p) { | |
| 3756 ResourceMark rm; | |
| 3757 p->print_on(st); | |
| 3758 if (print_stacks) { | |
| 3759 if (internal_format) { | |
| 3760 p->trace_stack(); | |
| 3761 } else { | |
| 3762 p->print_stack_on(st); | |
| 3763 } | |
| 3764 } | |
| 3765 st->cr(); | |
| 3766 #ifndef SERIALGC | |
| 3767 if (print_concurrent_locks) { | |
| 3768 concurrent_locks.print_locks_on(p, st); | |
| 3769 } | |
| 3770 #endif // SERIALGC | |
| 3771 } | |
| 3772 | |
| 3773 VMThread::vm_thread()->print_on(st); | |
| 3774 st->cr(); | |
| 3775 Universe::heap()->print_gc_threads_on(st); | |
| 3776 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 3777 if (wt != NULL) wt->print_on(st); | |
| 3778 st->cr(); | |
| 3779 CompileBroker::print_compiler_threads_on(st); | |
| 3780 st->flush(); | |
| 3781 } | |
| 3782 | |
| 3783 // Threads::print_on_error() is called by fatal error handler. It's possible | |
| 3784 // that VM is not at safepoint and/or current thread is inside signal handler. | |
| 3785 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
| 3786 // memory (even in resource area), it might deadlock the error handler. | |
| 3787 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
| 3788 bool found_current = false; | |
| 3789 st->print_cr("Java Threads: ( => current thread )"); | |
| 3790 ALL_JAVA_THREADS(thread) { | |
| 3791 bool is_current = (current == thread); | |
| 3792 found_current = found_current || is_current; | |
| 3793 | |
| 3794 st->print("%s", is_current ? "=>" : " "); | |
| 3795 | |
| 3796 st->print(PTR_FORMAT, thread); | |
| 3797 st->print(" "); | |
| 3798 thread->print_on_error(st, buf, buflen); | |
| 3799 st->cr(); | |
| 3800 } | |
| 3801 st->cr(); | |
| 3802 | |
| 3803 st->print_cr("Other Threads:"); | |
| 3804 if (VMThread::vm_thread()) { | |
| 3805 bool is_current = (current == VMThread::vm_thread()); | |
| 3806 found_current = found_current || is_current; | |
| 3807 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
| 3808 | |
| 3809 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
| 3810 st->print(" "); | |
| 3811 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
| 3812 st->cr(); | |
| 3813 } | |
| 3814 WatcherThread* wt = WatcherThread::watcher_thread(); | |
| 3815 if (wt != NULL) { | |
| 3816 bool is_current = (current == wt); | |
| 3817 found_current = found_current || is_current; | |
| 3818 st->print("%s", is_current ? "=>" : " "); | |
| 3819 | |
| 3820 st->print(PTR_FORMAT, wt); | |
| 3821 st->print(" "); | |
| 3822 wt->print_on_error(st, buf, buflen); | |
| 3823 st->cr(); | |
| 3824 } | |
| 3825 if (!found_current) { | |
| 3826 st->cr(); | |
| 3827 st->print("=>" PTR_FORMAT " (exited) ", current); | |
| 3828 current->print_on_error(st, buf, buflen); | |
| 3829 st->cr(); | |
| 3830 } | |
| 3831 } | |
| 3832 | |
| 3833 | |
| 3834 // Lifecycle management for TSM ParkEvents. | |
| 3835 // ParkEvents are type-stable (TSM). | |
| 3836 // In our particular implementation they happen to be immortal. | |
| 3837 // | |
| 3838 // We manage concurrency on the FreeList with a CAS-based | |
| 3839 // detach-modify-reattach idiom that avoids the ABA problems | |
| 3840 // that would otherwise be present in a simple CAS-based | |
| 3841 // push-pop implementation. (push-one and pop-all) | |
| 3842 // | |
| 3843 // Caveat: Allocate() and Release() may be called from threads | |
| 3844 // other than the thread associated with the Event! | |
| 3845 // If we need to call Allocate() when running as the thread in | |
| 3846 // question then look for the PD calls to initialize native TLS. | |
| 3847 // Native TLS (Win32/Linux/Solaris) can only be initialized or | |
| 3848 // accessed by the associated thread. | |
| 3849 // See also pd_initialize(). | |
| 3850 // | |
| 3851 // Note that we could defer associating a ParkEvent with a thread | |
| 3852 // until the 1st time the thread calls park(). unpark() calls to | |
| 3853 // an unprovisioned thread would be ignored. The first park() call | |
| 3854 // for a thread would allocate and associate a ParkEvent and return | |
| 3855 // immediately. | |
| 3856 | |
| 3857 volatile int ParkEvent::ListLock = 0 ; | |
| 3858 ParkEvent * volatile ParkEvent::FreeList = NULL ; | |
| 3859 | |
| 3860 ParkEvent * ParkEvent::Allocate (Thread * t) { | |
| 3861 // In rare cases -- JVM_RawMonitor* operations -- we can find t == null. | |
| 3862 ParkEvent * ev ; | |
| 3863 | |
| 3864 // Start by trying to recycle an existing but unassociated | |
| 3865 // ParkEvent from the global free list. | |
| 3866 for (;;) { | |
| 3867 ev = FreeList ; | |
| 3868 if (ev == NULL) break ; | |
| 3869 // 1: Detach - sequester or privatize the list | |
| 3870 // Tantamount to ev = Swap (&FreeList, NULL) | |
| 3871 if (Atomic::cmpxchg_ptr (NULL, &FreeList, ev) != ev) { | |
| 3872 continue ; | |
| 3873 } | |
| 3874 | |
| 3875 // We've detached the list. The list in-hand is now | |
| 3876 // local to this thread. This thread can operate on the | |
| 3877 // list without risk of interference from other threads. | |
| 3878 // 2: Extract -- pop the 1st element from the list. | |
| 3879 ParkEvent * List = ev->FreeNext ; | |
| 3880 if (List == NULL) break ; | |
| 3881 for (;;) { | |
| 3882 // 3: Try to reattach the residual list | |
| 3883 guarantee (List != NULL, "invariant") ; | |
| 3884 ParkEvent * Arv = (ParkEvent *) Atomic::cmpxchg_ptr (List, &FreeList, NULL) ; | |
| 3885 if (Arv == NULL) break ; | |
| 3886 | |
| 3887 // New nodes arrived. Try to detach the recent arrivals. | |
| 3888 if (Atomic::cmpxchg_ptr (NULL, &FreeList, Arv) != Arv) { | |
| 3889 continue ; | |
| 3890 } | |
| 3891 guarantee (Arv != NULL, "invariant") ; | |
| 3892 // 4: Merge Arv into List | |
| 3893 ParkEvent * Tail = List ; | |
| 3894 while (Tail->FreeNext != NULL) Tail = Tail->FreeNext ; | |
| 3895 Tail->FreeNext = Arv ; | |
| 3896 } | |
| 3897 break ; | |
| 3898 } | |
| 3899 | |
| 3900 if (ev != NULL) { | |
| 3901 guarantee (ev->AssociatedWith == NULL, "invariant") ; | |
| 3902 } else { | |
| 3903 // Do this the hard way -- materialize a new ParkEvent. | |
| 3904 // In rare cases an allocating thread might detach a long list -- | |
| 3905 // installing null into FreeList -- and then stall or be obstructed. | |
| 3906 // A 2nd thread calling Allocate() would see FreeList == null. | |
| 3907 // The list held privately by the 1st thread is unavailable to the 2nd thread. | |
| 3908 // In that case the 2nd thread would have to materialize a new ParkEvent, | |
| 3909 // even though free ParkEvents existed in the system. In this case we end up | |
| 3910 // with more ParkEvents in circulation than we need, but the race is | |
| 3911 // rare and the outcome is benign. Ideally, the # of extant ParkEvents | |
| 3912 // is equal to the maximum # of threads that existed at any one time. | |
| 3913 // Because of the race mentioned above, segments of the freelist | |
| 3914 // can be transiently inaccessible. At worst we may end up with the | |
| 3915 // # of ParkEvents in circulation slightly above the ideal. | |
| 3916 // Note that if we didn't have the TSM/immortal constraint, then | |
| 3917 // when reattaching, above, we could trim the list. | |
| 3918 ev = new ParkEvent () ; | |
| 3919 guarantee ((intptr_t(ev) & 0xFF) == 0, "invariant") ; | |
| 3920 } | |
| 3921 ev->reset() ; // courtesy to caller | |
| 3922 ev->AssociatedWith = t ; // Associate ev with t | |
| 3923 ev->FreeNext = NULL ; | |
| 3924 return ev ; | |
| 3925 } | |
| 3926 | |
| 3927 void ParkEvent::Release (ParkEvent * ev) { | |
| 3928 if (ev == NULL) return ; | |
| 3929 guarantee (ev->FreeNext == NULL , "invariant") ; | |
| 3930 ev->AssociatedWith = NULL ; | |
| 3931 for (;;) { | |
| 3932 // Push ev onto FreeList | |
| 3933 // The mechanism is "half" lock-free. | |
| 3934 ParkEvent * List = FreeList ; | |
| 3935 ev->FreeNext = List ; | |
| 3936 if (Atomic::cmpxchg_ptr (ev, &FreeList, List) == List) break ; | |
| 3937 } | |
| 3938 } | |
| 3939 | |
| 3940 // Override operator new and delete so we can ensure that the | |
| 3941 // least significant byte of ParkEvent addresses is 0. | |
| 3942 // Beware that excessive address alignment is undesirable | |
| 3943 // as it can result in D$ index usage imbalance as | |
| 3944 // well as bank access imbalance on Niagara-like platforms, | |
| 3945 // although Niagara's hash function should help. | |
| 3946 | |
| 3947 void * ParkEvent::operator new (size_t sz) { | |
| 3948 return (void *) ((intptr_t (CHeapObj::operator new (sz + 256)) + 256) & -256) ; | |
| 3949 } | |
| 3950 | |
| 3951 void ParkEvent::operator delete (void * a) { | |
| 3952 // ParkEvents are type-stable and immortal ... | |
| 3953 ShouldNotReachHere(); | |
| 3954 } | |
| 3955 | |
| 3956 | |
| 3957 // 6399321 As a temporary measure we copied & modified the ParkEvent:: | |
| 3958 // allocate() and release() code for use by Parkers. The Parker:: forms | |
| 3959 // will eventually be removed as we consolide and shift over to ParkEvents | |
| 3960 // for both builtin synchronization and JSR166 operations. | |
| 3961 | |
| 3962 volatile int Parker::ListLock = 0 ; | |
| 3963 Parker * volatile Parker::FreeList = NULL ; | |
| 3964 | |
| 3965 Parker * Parker::Allocate (JavaThread * t) { | |
| 3966 guarantee (t != NULL, "invariant") ; | |
| 3967 Parker * p ; | |
| 3968 | |
| 3969 // Start by trying to recycle an existing but unassociated | |
| 3970 // Parker from the global free list. | |
| 3971 for (;;) { | |
| 3972 p = FreeList ; | |
| 3973 if (p == NULL) break ; | |
| 3974 // 1: Detach | |
| 3975 // Tantamount to p = Swap (&FreeList, NULL) | |
| 3976 if (Atomic::cmpxchg_ptr (NULL, &FreeList, p) != p) { | |
| 3977 continue ; | |
| 3978 } | |
| 3979 | |
| 3980 // We've detached the list. The list in-hand is now | |
| 3981 // local to this thread. This thread can operate on the | |
| 3982 // list without risk of interference from other threads. | |
| 3983 // 2: Extract -- pop the 1st element from the list. | |
| 3984 Parker * List = p->FreeNext ; | |
| 3985 if (List == NULL) break ; | |
| 3986 for (;;) { | |
| 3987 // 3: Try to reattach the residual list | |
| 3988 guarantee (List != NULL, "invariant") ; | |
| 3989 Parker * Arv = (Parker *) Atomic::cmpxchg_ptr (List, &FreeList, NULL) ; | |
| 3990 if (Arv == NULL) break ; | |
| 3991 | |
| 3992 // New nodes arrived. Try to detach the recent arrivals. | |
| 3993 if (Atomic::cmpxchg_ptr (NULL, &FreeList, Arv) != Arv) { | |
| 3994 continue ; | |
| 3995 } | |
| 3996 guarantee (Arv != NULL, "invariant") ; | |
| 3997 // 4: Merge Arv into List | |
| 3998 Parker * Tail = List ; | |
| 3999 while (Tail->FreeNext != NULL) Tail = Tail->FreeNext ; | |
| 4000 Tail->FreeNext = Arv ; | |
| 4001 } | |
| 4002 break ; | |
| 4003 } | |
| 4004 | |
| 4005 if (p != NULL) { | |
| 4006 guarantee (p->AssociatedWith == NULL, "invariant") ; | |
| 4007 } else { | |
| 4008 // Do this the hard way -- materialize a new Parker.. | |
| 4009 // In rare cases an allocating thread might detach | |
| 4010 // a long list -- installing null into FreeList --and | |
| 4011 // then stall. Another thread calling Allocate() would see | |
| 4012 // FreeList == null and then invoke the ctor. In this case we | |
| 4013 // end up with more Parkers in circulation than we need, but | |
| 4014 // the race is rare and the outcome is benign. | |
| 4015 // Ideally, the # of extant Parkers is equal to the | |
| 4016 // maximum # of threads that existed at any one time. | |
| 4017 // Because of the race mentioned above, segments of the | |
| 4018 // freelist can be transiently inaccessible. At worst | |
| 4019 // we may end up with the # of Parkers in circulation | |
| 4020 // slightly above the ideal. | |
| 4021 p = new Parker() ; | |
| 4022 } | |
| 4023 p->AssociatedWith = t ; // Associate p with t | |
| 4024 p->FreeNext = NULL ; | |
| 4025 return p ; | |
| 4026 } | |
| 4027 | |
| 4028 | |
| 4029 void Parker::Release (Parker * p) { | |
| 4030 if (p == NULL) return ; | |
| 4031 guarantee (p->AssociatedWith != NULL, "invariant") ; | |
| 4032 guarantee (p->FreeNext == NULL , "invariant") ; | |
| 4033 p->AssociatedWith = NULL ; | |
| 4034 for (;;) { | |
| 4035 // Push p onto FreeList | |
| 4036 Parker * List = FreeList ; | |
| 4037 p->FreeNext = List ; | |
| 4038 if (Atomic::cmpxchg_ptr (p, &FreeList, List) == List) break ; | |
| 4039 } | |
| 4040 } | |
| 4041 | |
| 4042 void Threads::verify() { | |
| 4043 ALL_JAVA_THREADS(p) { | |
| 4044 p->verify(); | |
| 4045 } | |
| 4046 VMThread* thread = VMThread::vm_thread(); | |
| 4047 if (thread != NULL) thread->verify(); | |
| 4048 } |