1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoader.hpp"
27 #include "classfile/javaClasses.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/scopeDesc.hpp"
31 #include "compiler/compileBroker.hpp"
32 #ifdef GRAAL
33 #include "graal/graalCompiler.hpp"
34 #include "graal/graalRuntime.hpp"
35 #endif
36 #include "interpreter/interpreter.hpp"
37 #include "interpreter/linkResolver.hpp"
38 #include "interpreter/oopMapCache.hpp"
39 #include "jvmtifiles/jvmtiEnv.hpp"
40 #include "memory/gcLocker.inline.hpp"
41 #include "memory/metaspaceShared.hpp"
42 #include "memory/oopFactory.hpp"
43 #include "memory/universe.inline.hpp"
44 #include "oops/instanceKlass.hpp"
45 #include "oops/objArrayOop.hpp"
46 #include "oops/oop.inline.hpp"
47 #include "oops/symbol.hpp"
48 #include "prims/jvm_misc.hpp"
49 #include "prims/jvmtiExport.hpp"
50 #include "prims/jvmtiThreadState.hpp"
51 #include "prims/privilegedStack.hpp"
52 #include "runtime/arguments.hpp"
53 #include "runtime/biasedLocking.hpp"
54 #include "runtime/deoptimization.hpp"
55 #include "runtime/fprofiler.hpp"
56 #include "runtime/frame.inline.hpp"
57 #include "runtime/gpu.hpp"
58 #ifdef GRAAL
59 # include "hsail/vm/gpu_hsail.hpp"
60 #endif
61 #include "runtime/init.hpp"
62 #include "runtime/interfaceSupport.hpp"
63 #include "runtime/java.hpp"
64 #include "runtime/javaCalls.hpp"
65 #include "runtime/jniPeriodicChecker.hpp"
66 #include "runtime/memprofiler.hpp"
67 #include "runtime/mutexLocker.hpp"
68 #include "runtime/objectMonitor.hpp"
69 #include "runtime/osThread.hpp"
70 #include "runtime/safepoint.hpp"
71 #include "runtime/sharedRuntime.hpp"
72 #include "runtime/statSampler.hpp"
73 #include "runtime/stubRoutines.hpp"
74 #include "runtime/task.hpp"
75 #include "runtime/thread.inline.hpp"
76 #include "runtime/threadCritical.hpp"
77 #include "runtime/threadLocalStorage.hpp"
78 #include "runtime/vframe.hpp"
79 #include "runtime/vframeArray.hpp"
80 #include "runtime/vframe_hp.hpp"
81 #include "runtime/vmThread.hpp"
82 #include "runtime/vm_operations.hpp"
83 #include "services/attachListener.hpp"
84 #include "services/management.hpp"
85 #include "services/memTracker.hpp"
86 #include "services/threadService.hpp"
87 #include "trace/tracing.hpp"
88 #include "trace/traceMacros.hpp"
89 #include "utilities/defaultStream.hpp"
90 #include "utilities/dtrace.hpp"
91 #include "utilities/events.hpp"
92 #include "utilities/preserveException.hpp"
93 #include "utilities/macros.hpp"
94 #ifdef TARGET_OS_FAMILY_linux
95 # include "os_linux.inline.hpp"
96 #endif
97 #ifdef TARGET_OS_FAMILY_solaris
98 # include "os_solaris.inline.hpp"
99 #endif
100 #ifdef TARGET_OS_FAMILY_windows
101 # include "os_windows.inline.hpp"
102 #endif
103 #ifdef TARGET_OS_FAMILY_bsd
104 # include "os_bsd.inline.hpp"
105 #endif
106 #if INCLUDE_ALL_GCS
107 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp"
108 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp"
109 #include "gc_implementation/parallelScavenge/pcTasks.hpp"
110 #endif // INCLUDE_ALL_GCS
111 #ifdef COMPILER1
112 #include "c1/c1_Compiler.hpp"
113 #endif
114 #ifdef COMPILER2
115 #include "opto/c2compiler.hpp"
116 #include "opto/idealGraphPrinter.hpp"
117 #endif
118
119 #ifdef DTRACE_ENABLED
120
121 // Only bother with this argument setup if dtrace is available
122
123 #ifndef USDT2
124 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin);
125 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end);
126 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t,
127 intptr_t, intptr_t, bool);
128 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t,
129 intptr_t, intptr_t, bool);
130
131 #define DTRACE_THREAD_PROBE(probe, javathread) \
132 { \
133 ResourceMark rm(this); \
134 int len = 0; \
135 const char* name = (javathread)->get_thread_name(); \
136 len = strlen(name); \
137 HS_DTRACE_PROBE5(hotspot, thread__##probe, \
138 name, len, \
139 java_lang_Thread::thread_id((javathread)->threadObj()), \
140 (javathread)->osthread()->thread_id(), \
141 java_lang_Thread::is_daemon((javathread)->threadObj())); \
142 }
143
144 #else /* USDT2 */
145
146 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_PROBE_START
147 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_PROBE_STOP
148
149 #define DTRACE_THREAD_PROBE(probe, javathread) \
150 { \
151 ResourceMark rm(this); \
152 int len = 0; \
153 const char* name = (javathread)->get_thread_name(); \
154 len = strlen(name); \
155 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \
156 (char *) name, len, \
157 java_lang_Thread::thread_id((javathread)->threadObj()), \
158 (uintptr_t) (javathread)->osthread()->thread_id(), \
159 java_lang_Thread::is_daemon((javathread)->threadObj())); \
160 }
161
162 #endif /* USDT2 */
163
164 #else // ndef DTRACE_ENABLED
165
166 #define DTRACE_THREAD_PROBE(probe, javathread)
167
168 #endif // ndef DTRACE_ENABLED
169
170
171 // Class hierarchy
172 // - Thread
173 // - VMThread
174 // - WatcherThread
175 // - ConcurrentMarkSweepThread
176 // - JavaThread
177 // - CompilerThread
178
179 // ======= Thread ========
180 // Support for forcing alignment of thread objects for biased locking
181 void* Thread::allocate(size_t size, bool throw_excpt, MEMFLAGS flags) {
182 if (UseBiasedLocking) {
183 const int alignment = markOopDesc::biased_lock_alignment;
184 size_t aligned_size = size + (alignment - sizeof(intptr_t));
185 void* real_malloc_addr = throw_excpt? AllocateHeap(aligned_size, flags, CURRENT_PC)
186 : AllocateHeap(aligned_size, flags, CURRENT_PC,
187 AllocFailStrategy::RETURN_NULL);
188 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment);
189 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <=
190 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size),
191 "JavaThread alignment code overflowed allocated storage");
192 if (TraceBiasedLocking) {
193 if (aligned_addr != real_malloc_addr)
194 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT,
195 real_malloc_addr, aligned_addr);
196 }
197 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr;
198 return aligned_addr;
199 } else {
200 return throw_excpt? AllocateHeap(size, flags, CURRENT_PC)
201 : AllocateHeap(size, flags, CURRENT_PC, AllocFailStrategy::RETURN_NULL);
202 }
203 }
204
205 void Thread::operator delete(void* p) {
206 if (UseBiasedLocking) {
207 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address;
208 FreeHeap(real_malloc_addr, mtThread);
209 } else {
210 FreeHeap(p, mtThread);
211 }
212 }
213
214
215 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread,
216 // JavaThread
217
218
219 Thread::Thread() {
220 // stack and get_thread
221 set_stack_base(NULL);
222 set_stack_size(0);
223 set_self_raw_id(0);
224 set_lgrp_id(-1);
225
226 // allocated data structures
227 set_osthread(NULL);
228 set_resource_area(new (mtThread)ResourceArea());
229 DEBUG_ONLY(_current_resource_mark = NULL;)
230 set_handle_area(new (mtThread) HandleArea(NULL));
231 set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(30, true));
232 set_active_handles(NULL);
233 set_free_handle_block(NULL);
234 set_last_handle_mark(NULL);
235
236 // This initial value ==> never claimed.
237 _oops_do_parity = 0;
238
239 // the handle mark links itself to last_handle_mark
240 new HandleMark(this);
241
242 // plain initialization
243 debug_only(_owned_locks = NULL;)
244 debug_only(_allow_allocation_count = 0;)
245 NOT_PRODUCT(_allow_safepoint_count = 0;)
246 NOT_PRODUCT(_skip_gcalot = false;)
247 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;)
248 _jvmti_env_iteration_count = 0;
249 set_allocated_bytes(0);
250 _vm_operation_started_count = 0;
251 _vm_operation_completed_count = 0;
252 _current_pending_monitor = NULL;
253 _current_pending_monitor_is_from_java = true;
254 _current_waiting_monitor = NULL;
255 _num_nested_signal = 0;
256 omFreeList = NULL ;
257 omFreeCount = 0 ;
258 omFreeProvision = 32 ;
259 omInUseList = NULL ;
260 omInUseCount = 0 ;
261
262 #ifdef ASSERT
263 _visited_for_critical_count = false;
264 #endif
265
266 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true);
267 _suspend_flags = 0;
268
269 // thread-specific hashCode stream generator state - Marsaglia shift-xor form
270 _hashStateX = os::random() ;
271 _hashStateY = 842502087 ;
272 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ;
273 _hashStateW = 273326509 ;
274
275 _OnTrap = 0 ;
276 _schedctl = NULL ;
277 _Stalled = 0 ;
278 _TypeTag = 0x2BAD ;
279
280 // Many of the following fields are effectively final - immutable
281 // Note that nascent threads can't use the Native Monitor-Mutex
282 // construct until the _MutexEvent is initialized ...
283 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents
284 // we might instead use a stack of ParkEvents that we could provision on-demand.
285 // The stack would act as a cache to avoid calls to ParkEvent::Allocate()
286 // and ::Release()
287 _ParkEvent = ParkEvent::Allocate (this) ;
288 _SleepEvent = ParkEvent::Allocate (this) ;
289 _MutexEvent = ParkEvent::Allocate (this) ;
290 _MuxEvent = ParkEvent::Allocate (this) ;
291
292 #ifdef CHECK_UNHANDLED_OOPS
293 if (CheckUnhandledOops) {
294 _unhandled_oops = new UnhandledOops(this);
295 }
296 #endif // CHECK_UNHANDLED_OOPS
297 #ifdef ASSERT
298 if (UseBiasedLocking) {
299 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed");
300 assert(this == _real_malloc_address ||
301 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment),
302 "bug in forced alignment of thread objects");
303 }
304 #endif /* ASSERT */
305 }
306
307 void Thread::initialize_thread_local_storage() {
308 // Note: Make sure this method only calls
309 // non-blocking operations. Otherwise, it might not work
310 // with the thread-startup/safepoint interaction.
311
312 // During Java thread startup, safepoint code should allow this
313 // method to complete because it may need to allocate memory to
314 // store information for the new thread.
315
316 // initialize structure dependent on thread local storage
317 ThreadLocalStorage::set_thread(this);
318 }
319
320 void Thread::record_stack_base_and_size() {
321 set_stack_base(os::current_stack_base());
322 set_stack_size(os::current_stack_size());
323 // CR 7190089: on Solaris, primordial thread's stack is adjusted
324 // in initialize_thread(). Without the adjustment, stack size is
325 // incorrect if stack is set to unlimited (ulimit -s unlimited).
326 // So far, only Solaris has real implementation of initialize_thread().
327 //
328 // set up any platform-specific state.
329 os::initialize_thread(this);
330
331 #if INCLUDE_NMT
332 // record thread's native stack, stack grows downward
333 address stack_low_addr = stack_base() - stack_size();
334 MemTracker::record_thread_stack(stack_low_addr, stack_size(), this,
335 CURRENT_PC);
336 #endif // INCLUDE_NMT
337 }
338
339
340 Thread::~Thread() {
341 // Reclaim the objectmonitors from the omFreeList of the moribund thread.
342 ObjectSynchronizer::omFlush (this) ;
343
344 EVENT_THREAD_DESTRUCT(this);
345
346 // stack_base can be NULL if the thread is never started or exited before
347 // record_stack_base_and_size called. Although, we would like to ensure
348 // that all started threads do call record_stack_base_and_size(), there is
349 // not proper way to enforce that.
350 #if INCLUDE_NMT
351 if (_stack_base != NULL) {
352 address low_stack_addr = stack_base() - stack_size();
353 MemTracker::release_thread_stack(low_stack_addr, stack_size(), this);
354 #ifdef ASSERT
355 set_stack_base(NULL);
356 #endif
357 }
358 #endif // INCLUDE_NMT
359
360 // deallocate data structures
361 delete resource_area();
362 // since the handle marks are using the handle area, we have to deallocated the root
363 // handle mark before deallocating the thread's handle area,
364 assert(last_handle_mark() != NULL, "check we have an element");
365 delete last_handle_mark();
366 assert(last_handle_mark() == NULL, "check we have reached the end");
367
368 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads.
369 // We NULL out the fields for good hygiene.
370 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ;
371 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ;
372 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ;
373 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ;
374
375 delete handle_area();
376 delete metadata_handles();
377
378 // osthread() can be NULL, if creation of thread failed.
379 if (osthread() != NULL) os::free_thread(osthread());
380
381 delete _SR_lock;
382
383 // clear thread local storage if the Thread is deleting itself
384 if (this == Thread::current()) {
385 ThreadLocalStorage::set_thread(NULL);
386 } else {
387 // In the case where we're not the current thread, invalidate all the
388 // caches in case some code tries to get the current thread or the
389 // thread that was destroyed, and gets stale information.
390 ThreadLocalStorage::invalidate_all();
391 }
392 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();)
393 }
394
395 // NOTE: dummy function for assertion purpose.
396 void Thread::run() {
397 ShouldNotReachHere();
398 }
399
400 #ifdef ASSERT
401 // Private method to check for dangling thread pointer
402 void check_for_dangling_thread_pointer(Thread *thread) {
403 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(),
404 "possibility of dangling Thread pointer");
405 }
406 #endif
407
408
409 #ifndef PRODUCT
410 // Tracing method for basic thread operations
411 void Thread::trace(const char* msg, const Thread* const thread) {
412 if (!TraceThreadEvents) return;
413 ResourceMark rm;
414 ThreadCritical tc;
415 const char *name = "non-Java thread";
416 int prio = -1;
417 if (thread->is_Java_thread()
418 && !thread->is_Compiler_thread()) {
419 // The Threads_lock must be held to get information about
420 // this thread but may not be in some situations when
421 // tracing thread events.
422 bool release_Threads_lock = false;
423 if (!Threads_lock->owned_by_self()) {
424 Threads_lock->lock();
425 release_Threads_lock = true;
426 }
427 JavaThread* jt = (JavaThread *)thread;
428 name = (char *)jt->get_thread_name();
429 oop thread_oop = jt->threadObj();
430 if (thread_oop != NULL) {
431 prio = java_lang_Thread::priority(thread_oop);
432 }
433 if (release_Threads_lock) {
434 Threads_lock->unlock();
435 }
436 }
437 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio);
438 }
439 #endif
440
441
442 ThreadPriority Thread::get_priority(const Thread* const thread) {
443 trace("get priority", thread);
444 ThreadPriority priority;
445 // Can return an error!
446 (void)os::get_priority(thread, priority);
447 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found");
448 return priority;
449 }
450
451 void Thread::set_priority(Thread* thread, ThreadPriority priority) {
452 trace("set priority", thread);
453 debug_only(check_for_dangling_thread_pointer(thread);)
454 // Can return an error!
455 (void)os::set_priority(thread, priority);
456 }
457
458
459 void Thread::start(Thread* thread) {
460 trace("start", thread);
461 // Start is different from resume in that its safety is guaranteed by context or
462 // being called from a Java method synchronized on the Thread object.
463 if (!DisableStartThread) {
464 if (thread->is_Java_thread()) {
465 // Initialize the thread state to RUNNABLE before starting this thread.
466 // Can not set it after the thread started because we do not know the
467 // exact thread state at that time. It could be in MONITOR_WAIT or
468 // in SLEEPING or some other state.
469 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(),
470 java_lang_Thread::RUNNABLE);
471 }
472 os::start_thread(thread);
473 }
474 }
475
476 // Enqueue a VM_Operation to do the job for us - sometime later
477 void Thread::send_async_exception(oop java_thread, oop java_throwable) {
478 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable);
479 VMThread::execute(vm_stop);
480 }
481
482
483 //
484 // Check if an external suspend request has completed (or has been
485 // cancelled). Returns true if the thread is externally suspended and
486 // false otherwise.
487 //
488 // The bits parameter returns information about the code path through
489 // the routine. Useful for debugging:
490 //
491 // set in is_ext_suspend_completed():
492 // 0x00000001 - routine was entered
493 // 0x00000010 - routine return false at end
494 // 0x00000100 - thread exited (return false)
495 // 0x00000200 - suspend request cancelled (return false)
496 // 0x00000400 - thread suspended (return true)
497 // 0x00001000 - thread is in a suspend equivalent state (return true)
498 // 0x00002000 - thread is native and walkable (return true)
499 // 0x00004000 - thread is native_trans and walkable (needed retry)
500 //
501 // set in wait_for_ext_suspend_completion():
502 // 0x00010000 - routine was entered
503 // 0x00020000 - suspend request cancelled before loop (return false)
504 // 0x00040000 - thread suspended before loop (return true)
505 // 0x00080000 - suspend request cancelled in loop (return false)
506 // 0x00100000 - thread suspended in loop (return true)
507 // 0x00200000 - suspend not completed during retry loop (return false)
508 //
509
510 // Helper class for tracing suspend wait debug bits.
511 //
512 // 0x00000100 indicates that the target thread exited before it could
513 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and
514 // 0x00080000 each indicate a cancelled suspend request so they don't
515 // count as wait failures either.
516 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000)
517
518 class TraceSuspendDebugBits : public StackObj {
519 private:
520 JavaThread * jt;
521 bool is_wait;
522 bool called_by_wait; // meaningful when !is_wait
523 uint32_t * bits;
524
525 public:
526 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait,
527 uint32_t *_bits) {
528 jt = _jt;
529 is_wait = _is_wait;
530 called_by_wait = _called_by_wait;
531 bits = _bits;
532 }
533
534 ~TraceSuspendDebugBits() {
535 if (!is_wait) {
536 #if 1
537 // By default, don't trace bits for is_ext_suspend_completed() calls.
538 // That trace is very chatty.
539 return;
540 #else
541 if (!called_by_wait) {
542 // If tracing for is_ext_suspend_completed() is enabled, then only
543 // trace calls to it from wait_for_ext_suspend_completion()
544 return;
545 }
546 #endif
547 }
548
549 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) {
550 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) {
551 MutexLocker ml(Threads_lock); // needed for get_thread_name()
552 ResourceMark rm;
553
554 tty->print_cr(
555 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)",
556 jt->get_thread_name(), *bits);
557
558 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed");
559 }
560 }
561 }
562 };
563 #undef DEBUG_FALSE_BITS
564
565
566 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) {
567 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits);
568
569 bool did_trans_retry = false; // only do thread_in_native_trans retry once
570 bool do_trans_retry; // flag to force the retry
571
572 *bits |= 0x00000001;
573
574 do {
575 do_trans_retry = false;
576
577 if (is_exiting()) {
578 // Thread is in the process of exiting. This is always checked
579 // first to reduce the risk of dereferencing a freed JavaThread.
580 *bits |= 0x00000100;
581 return false;
582 }
583
584 if (!is_external_suspend()) {
585 // Suspend request is cancelled. This is always checked before
586 // is_ext_suspended() to reduce the risk of a rogue resume
587 // confusing the thread that made the suspend request.
588 *bits |= 0x00000200;
589 return false;
590 }
591
592 if (is_ext_suspended()) {
593 // thread is suspended
594 *bits |= 0x00000400;
595 return true;
596 }
597
598 // Now that we no longer do hard suspends of threads running
599 // native code, the target thread can be changing thread state
600 // while we are in this routine:
601 //
602 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked
603 //
604 // We save a copy of the thread state as observed at this moment
605 // and make our decision about suspend completeness based on the
606 // copy. This closes the race where the thread state is seen as
607 // _thread_in_native_trans in the if-thread_blocked check, but is
608 // seen as _thread_blocked in if-thread_in_native_trans check.
609 JavaThreadState save_state = thread_state();
610
611 if (save_state == _thread_blocked && is_suspend_equivalent()) {
612 // If the thread's state is _thread_blocked and this blocking
613 // condition is known to be equivalent to a suspend, then we can
614 // consider the thread to be externally suspended. This means that
615 // the code that sets _thread_blocked has been modified to do
616 // self-suspension if the blocking condition releases. We also
617 // used to check for CONDVAR_WAIT here, but that is now covered by
618 // the _thread_blocked with self-suspension check.
619 //
620 // Return true since we wouldn't be here unless there was still an
621 // external suspend request.
622 *bits |= 0x00001000;
623 return true;
624 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) {
625 // Threads running native code will self-suspend on native==>VM/Java
626 // transitions. If its stack is walkable (should always be the case
627 // unless this function is called before the actual java_suspend()
628 // call), then the wait is done.
629 *bits |= 0x00002000;
630 return true;
631 } else if (!called_by_wait && !did_trans_retry &&
632 save_state == _thread_in_native_trans &&
633 frame_anchor()->walkable()) {
634 // The thread is transitioning from thread_in_native to another
635 // thread state. check_safepoint_and_suspend_for_native_trans()
636 // will force the thread to self-suspend. If it hasn't gotten
637 // there yet we may have caught the thread in-between the native
638 // code check above and the self-suspend. Lucky us. If we were
639 // called by wait_for_ext_suspend_completion(), then it
640 // will be doing the retries so we don't have to.
641 //
642 // Since we use the saved thread state in the if-statement above,
643 // there is a chance that the thread has already transitioned to
644 // _thread_blocked by the time we get here. In that case, we will
645 // make a single unnecessary pass through the logic below. This
646 // doesn't hurt anything since we still do the trans retry.
647
648 *bits |= 0x00004000;
649
650 // Once the thread leaves thread_in_native_trans for another
651 // thread state, we break out of this retry loop. We shouldn't
652 // need this flag to prevent us from getting back here, but
653 // sometimes paranoia is good.
654 did_trans_retry = true;
655
656 // We wait for the thread to transition to a more usable state.
657 for (int i = 1; i <= SuspendRetryCount; i++) {
658 // We used to do an "os::yield_all(i)" call here with the intention
659 // that yielding would increase on each retry. However, the parameter
660 // is ignored on Linux which means the yield didn't scale up. Waiting
661 // on the SR_lock below provides a much more predictable scale up for
662 // the delay. It also provides a simple/direct point to check for any
663 // safepoint requests from the VMThread
664
665 // temporarily drops SR_lock while doing wait with safepoint check
666 // (if we're a JavaThread - the WatcherThread can also call this)
667 // and increase delay with each retry
668 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay);
669
670 // check the actual thread state instead of what we saved above
671 if (thread_state() != _thread_in_native_trans) {
672 // the thread has transitioned to another thread state so
673 // try all the checks (except this one) one more time.
674 do_trans_retry = true;
675 break;
676 }
677 } // end retry loop
678
679
680 }
681 } while (do_trans_retry);
682
683 *bits |= 0x00000010;
684 return false;
685 }
686
687 //
688 // Wait for an external suspend request to complete (or be cancelled).
689 // Returns true if the thread is externally suspended and false otherwise.
690 //
691 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay,
692 uint32_t *bits) {
693 TraceSuspendDebugBits tsdb(this, true /* is_wait */,
694 false /* !called_by_wait */, bits);
695
696 // local flag copies to minimize SR_lock hold time
697 bool is_suspended;
698 bool pending;
699 uint32_t reset_bits;
700
701 // set a marker so is_ext_suspend_completed() knows we are the caller
702 *bits |= 0x00010000;
703
704 // We use reset_bits to reinitialize the bits value at the top of
705 // each retry loop. This allows the caller to make use of any
706 // unused bits for their own marking purposes.
707 reset_bits = *bits;
708
709 {
710 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
711 is_suspended = is_ext_suspend_completed(true /* called_by_wait */,
712 delay, bits);
713 pending = is_external_suspend();
714 }
715 // must release SR_lock to allow suspension to complete
716
717 if (!pending) {
718 // A cancelled suspend request is the only false return from
719 // is_ext_suspend_completed() that keeps us from entering the
720 // retry loop.
721 *bits |= 0x00020000;
722 return false;
723 }
724
725 if (is_suspended) {
726 *bits |= 0x00040000;
727 return true;
728 }
729
730 for (int i = 1; i <= retries; i++) {
731 *bits = reset_bits; // reinit to only track last retry
732
733 // We used to do an "os::yield_all(i)" call here with the intention
734 // that yielding would increase on each retry. However, the parameter
735 // is ignored on Linux which means the yield didn't scale up. Waiting
736 // on the SR_lock below provides a much more predictable scale up for
737 // the delay. It also provides a simple/direct point to check for any
738 // safepoint requests from the VMThread
739
740 {
741 MutexLocker ml(SR_lock());
742 // wait with safepoint check (if we're a JavaThread - the WatcherThread
743 // can also call this) and increase delay with each retry
744 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay);
745
746 is_suspended = is_ext_suspend_completed(true /* called_by_wait */,
747 delay, bits);
748
749 // It is possible for the external suspend request to be cancelled
750 // (by a resume) before the actual suspend operation is completed.
751 // Refresh our local copy to see if we still need to wait.
752 pending = is_external_suspend();
753 }
754
755 if (!pending) {
756 // A cancelled suspend request is the only false return from
757 // is_ext_suspend_completed() that keeps us from staying in the
758 // retry loop.
759 *bits |= 0x00080000;
760 return false;
761 }
762
763 if (is_suspended) {
764 *bits |= 0x00100000;
765 return true;
766 }
767 } // end retry loop
768
769 // thread did not suspend after all our retries
770 *bits |= 0x00200000;
771 return false;
772 }
773
774 #ifndef PRODUCT
775 void JavaThread::record_jump(address target, address instr, const char* file, int line) {
776
777 // This should not need to be atomic as the only way for simultaneous
778 // updates is via interrupts. Even then this should be rare or non-existant
779 // and we don't care that much anyway.
780
781 int index = _jmp_ring_index;
782 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1);
783 _jmp_ring[index]._target = (intptr_t) target;
784 _jmp_ring[index]._instruction = (intptr_t) instr;
785 _jmp_ring[index]._file = file;
786 _jmp_ring[index]._line = line;
787 }
788 #endif /* PRODUCT */
789
790 // Called by flat profiler
791 // Callers have already called wait_for_ext_suspend_completion
792 // The assertion for that is currently too complex to put here:
793 bool JavaThread::profile_last_Java_frame(frame* _fr) {
794 bool gotframe = false;
795 // self suspension saves needed state.
796 if (has_last_Java_frame() && _anchor.walkable()) {
797 *_fr = pd_last_frame();
798 gotframe = true;
799 }
800 return gotframe;
801 }
802
803 void Thread::interrupt(Thread* thread) {
804 trace("interrupt", thread);
805 debug_only(check_for_dangling_thread_pointer(thread);)
806 os::interrupt(thread);
807 }
808
809 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) {
810 trace("is_interrupted", thread);
811 debug_only(check_for_dangling_thread_pointer(thread);)
812 // Note: If clear_interrupted==false, this simply fetches and
813 // returns the value of the field osthread()->interrupted().
814 return os::is_interrupted(thread, clear_interrupted);
815 }
816
817
818 // GC Support
819 bool Thread::claim_oops_do_par_case(int strong_roots_parity) {
820 jint thread_parity = _oops_do_parity;
821 if (thread_parity != strong_roots_parity) {
822 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity);
823 if (res == thread_parity) {
824 return true;
825 } else {
826 guarantee(res == strong_roots_parity, "Or else what?");
827 assert(SharedHeap::heap()->workers()->active_workers() > 0,
828 "Should only fail when parallel.");
829 return false;
830 }
831 }
832 assert(SharedHeap::heap()->workers()->active_workers() > 0,
833 "Should only fail when parallel.");
834 return false;
835 }
836
837 void Thread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) {
838 active_handles()->oops_do(f);
839 // Do oop for ThreadShadow
840 f->do_oop((oop*)&_pending_exception);
841 #ifdef GRAAL
842 f->do_oop((oop*)&_pending_failed_speculation);
843 #endif
844 handle_area()->oops_do(f);
845 }
846
847 void Thread::nmethods_do(CodeBlobClosure* cf) {
848 // no nmethods in a generic thread...
849 }
850
851 void Thread::metadata_do(void f(Metadata*)) {
852 if (metadata_handles() != NULL) {
853 for (int i = 0; i< metadata_handles()->length(); i++) {
854 f(metadata_handles()->at(i));
855 }
856 }
857 }
858
859 void Thread::print_on(outputStream* st) const {
860 // get_priority assumes osthread initialized
861 if (osthread() != NULL) {
862 int os_prio;
863 if (os::get_native_priority(this, &os_prio) == OS_OK) {
864 st->print("os_prio=%d ", os_prio);
865 }
866 st->print("tid=" INTPTR_FORMAT " ", this);
867 osthread()->print_on(st);
868 }
869 debug_only(if (WizardMode) print_owned_locks_on(st);)
870 }
871
872 // Thread::print_on_error() is called by fatal error handler. Don't use
873 // any lock or allocate memory.
874 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const {
875 if (is_VM_thread()) st->print("VMThread");
876 else if (is_Compiler_thread()) st->print("CompilerThread");
877 else if (is_Java_thread()) st->print("JavaThread");
878 else if (is_GC_task_thread()) st->print("GCTaskThread");
879 else if (is_Watcher_thread()) st->print("WatcherThread");
880 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread");
881 else st->print("Thread");
882
883 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]",
884 _stack_base - _stack_size, _stack_base);
885
886 if (osthread()) {
887 st->print(" [id=%d]", osthread()->thread_id());
888 }
889 }
890
891 #ifdef ASSERT
892 void Thread::print_owned_locks_on(outputStream* st) const {
893 Monitor *cur = _owned_locks;
894 if (cur == NULL) {
895 st->print(" (no locks) ");
896 } else {
897 st->print_cr(" Locks owned:");
898 while(cur) {
899 cur->print_on(st);
900 cur = cur->next();
901 }
902 }
903 }
904
905 static int ref_use_count = 0;
906
907 bool Thread::owns_locks_but_compiled_lock() const {
908 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) {
909 if (cur != Compile_lock) return true;
910 }
911 return false;
912 }
913
914
915 #endif
916
917 #ifndef PRODUCT
918
919 // The flag: potential_vm_operation notifies if this particular safepoint state could potential
920 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that
921 // no threads which allow_vm_block's are held
922 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) {
923 // Check if current thread is allowed to block at a safepoint
924 if (!(_allow_safepoint_count == 0))
925 fatal("Possible safepoint reached by thread that does not allow it");
926 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) {
927 fatal("LEAF method calling lock?");
928 }
929
930 #ifdef ASSERT
931 if (potential_vm_operation && is_Java_thread()
932 && !Universe::is_bootstrapping()) {
933 // Make sure we do not hold any locks that the VM thread also uses.
934 // This could potentially lead to deadlocks
935 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) {
936 // Threads_lock is special, since the safepoint synchronization will not start before this is
937 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock,
938 // since it is used to transfer control between JavaThreads and the VMThread
939 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first!
940 if ( (cur->allow_vm_block() &&
941 cur != Threads_lock &&
942 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation
943 cur != VMOperationRequest_lock &&
944 cur != VMOperationQueue_lock) ||
945 cur->rank() == Mutex::special) {
946 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name());
947 }
948 }
949 }
950
951 if (GCALotAtAllSafepoints) {
952 // We could enter a safepoint here and thus have a gc
953 InterfaceSupport::check_gc_alot();
954 }
955 #endif
956 }
957 #endif
958
959 bool Thread::is_in_stack(address adr) const {
960 assert(Thread::current() == this, "is_in_stack can only be called from current thread");
961 address end = os::current_stack_pointer();
962 // Allow non Java threads to call this without stack_base
963 if (_stack_base == NULL) return true;
964 if (stack_base() >= adr && adr >= end) return true;
965
966 return false;
967 }
968
969
970 bool Thread::is_in_usable_stack(address adr) const {
971 size_t stack_guard_size = os::uses_stack_guard_pages() ? (StackYellowPages + StackRedPages) * os::vm_page_size() : 0;
972 size_t usable_stack_size = _stack_size - stack_guard_size;
973
974 return ((adr < stack_base()) && (adr >= stack_base() - usable_stack_size));
975 }
976
977
978 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter
979 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being
980 // used for compilation in the future. If that change is made, the need for these methods
981 // should be revisited, and they should be removed if possible.
982
983 bool Thread::is_lock_owned(address adr) const {
984 return on_local_stack(adr);
985 }
986
987 bool Thread::set_as_starting_thread() {
988 // NOTE: this must be called inside the main thread.
989 return os::create_main_thread((JavaThread*)this);
990 }
991
992 static void initialize_class(Symbol* class_name, TRAPS) {
993 Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK);
994 InstanceKlass::cast(klass)->initialize(CHECK);
995 }
996
997
998 // Creates the initial ThreadGroup
999 static Handle create_initial_thread_group(TRAPS) {
1000 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH);
1001 instanceKlassHandle klass (THREAD, k);
1002
1003 Handle system_instance = klass->allocate_instance_handle(CHECK_NH);
1004 {
1005 JavaValue result(T_VOID);
1006 JavaCalls::call_special(&result,
1007 system_instance,
1008 klass,
1009 vmSymbols::object_initializer_name(),
1010 vmSymbols::void_method_signature(),
1011 CHECK_NH);
1012 }
1013 Universe::set_system_thread_group(system_instance());
1014
1015 Handle main_instance = klass->allocate_instance_handle(CHECK_NH);
1016 {
1017 JavaValue result(T_VOID);
1018 Handle string = java_lang_String::create_from_str("main", CHECK_NH);
1019 JavaCalls::call_special(&result,
1020 main_instance,
1021 klass,
1022 vmSymbols::object_initializer_name(),
1023 vmSymbols::threadgroup_string_void_signature(),
1024 system_instance,
1025 string,
1026 CHECK_NH);
1027 }
1028 return main_instance;
1029 }
1030
1031 // Creates the initial Thread
1032 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) {
1033 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL);
1034 instanceKlassHandle klass (THREAD, k);
1035 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL);
1036
1037 java_lang_Thread::set_thread(thread_oop(), thread);
1038 java_lang_Thread::set_priority(thread_oop(), NormPriority);
1039 thread->set_threadObj(thread_oop());
1040
1041 Handle string = java_lang_String::create_from_str("main", CHECK_NULL);
1042
1043 JavaValue result(T_VOID);
1044 JavaCalls::call_special(&result, thread_oop,
1045 klass,
1046 vmSymbols::object_initializer_name(),
1047 vmSymbols::threadgroup_string_void_signature(),
1048 thread_group,
1049 string,
1050 CHECK_NULL);
1051 return thread_oop();
1052 }
1053
1054 static void call_initializeSystemClass(TRAPS) {
1055 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK);
1056 instanceKlassHandle klass (THREAD, k);
1057
1058 JavaValue result(T_VOID);
1059 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(),
1060 vmSymbols::void_method_signature(), CHECK);
1061 }
1062
1063 char java_runtime_name[128] = "";
1064 char java_runtime_version[128] = "";
1065
1066 // extract the JRE name from sun.misc.Version.java_runtime_name
1067 static const char* get_java_runtime_name(TRAPS) {
1068 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(),
1069 Handle(), Handle(), CHECK_AND_CLEAR_NULL);
1070 fieldDescriptor fd;
1071 bool found = k != NULL &&
1072 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_name_name(),
1073 vmSymbols::string_signature(), &fd);
1074 if (found) {
1075 oop name_oop = k->java_mirror()->obj_field(fd.offset());
1076 if (name_oop == NULL)
1077 return NULL;
1078 const char* name = java_lang_String::as_utf8_string(name_oop,
1079 java_runtime_name,
1080 sizeof(java_runtime_name));
1081 return name;
1082 } else {
1083 return NULL;
1084 }
1085 }
1086
1087 // extract the JRE version from sun.misc.Version.java_runtime_version
1088 static const char* get_java_runtime_version(TRAPS) {
1089 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(),
1090 Handle(), Handle(), CHECK_AND_CLEAR_NULL);
1091 fieldDescriptor fd;
1092 bool found = k != NULL &&
1093 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_version_name(),
1094 vmSymbols::string_signature(), &fd);
1095 if (found) {
1096 oop name_oop = k->java_mirror()->obj_field(fd.offset());
1097 if (name_oop == NULL)
1098 return NULL;
1099 const char* name = java_lang_String::as_utf8_string(name_oop,
1100 java_runtime_version,
1101 sizeof(java_runtime_version));
1102 return name;
1103 } else {
1104 return NULL;
1105 }
1106 }
1107
1108 // General purpose hook into Java code, run once when the VM is initialized.
1109 // The Java library method itself may be changed independently from the VM.
1110 static void call_postVMInitHook(TRAPS) {
1111 Klass* k = SystemDictionary::resolve_or_null(vmSymbols::sun_misc_PostVMInitHook(), THREAD);
1112 instanceKlassHandle klass (THREAD, k);
1113 if (klass.not_null()) {
1114 JavaValue result(T_VOID);
1115 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(),
1116 vmSymbols::void_method_signature(),
1117 CHECK);
1118 }
1119 }
1120
1121 static void reset_vm_info_property(TRAPS) {
1122 // the vm info string
1123 ResourceMark rm(THREAD);
1124 const char *vm_info = VM_Version::vm_info_string();
1125
1126 // java.lang.System class
1127 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK);
1128 instanceKlassHandle klass (THREAD, k);
1129
1130 // setProperty arguments
1131 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK);
1132 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK);
1133
1134 // return value
1135 JavaValue r(T_OBJECT);
1136
1137 // public static String setProperty(String key, String value);
1138 JavaCalls::call_static(&r,
1139 klass,
1140 vmSymbols::setProperty_name(),
1141 vmSymbols::string_string_string_signature(),
1142 key_str,
1143 value_str,
1144 CHECK);
1145 }
1146
1147
1148 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) {
1149 assert(thread_group.not_null(), "thread group should be specified");
1150 assert(threadObj() == NULL, "should only create Java thread object once");
1151
1152 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK);
1153 instanceKlassHandle klass (THREAD, k);
1154 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK);
1155
1156 java_lang_Thread::set_thread(thread_oop(), this);
1157 java_lang_Thread::set_priority(thread_oop(), NormPriority);
1158 set_threadObj(thread_oop());
1159
1160 JavaValue result(T_VOID);
1161 if (thread_name != NULL) {
1162 Handle name = java_lang_String::create_from_str(thread_name, CHECK);
1163 // Thread gets assigned specified name and null target
1164 JavaCalls::call_special(&result,
1165 thread_oop,
1166 klass,
1167 vmSymbols::object_initializer_name(),
1168 vmSymbols::threadgroup_string_void_signature(),
1169 thread_group, // Argument 1
1170 name, // Argument 2
1171 THREAD);
1172 } else {
1173 // Thread gets assigned name "Thread-nnn" and null target
1174 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument)
1175 JavaCalls::call_special(&result,
1176 thread_oop,
1177 klass,
1178 vmSymbols::object_initializer_name(),
1179 vmSymbols::threadgroup_runnable_void_signature(),
1180 thread_group, // Argument 1
1181 Handle(), // Argument 2
1182 THREAD);
1183 }
1184
1185
1186 if (daemon) {
1187 java_lang_Thread::set_daemon(thread_oop());
1188 }
1189
1190 if (HAS_PENDING_EXCEPTION) {
1191 return;
1192 }
1193
1194 KlassHandle group(this, SystemDictionary::ThreadGroup_klass());
1195 Handle threadObj(this, this->threadObj());
1196
1197 JavaCalls::call_special(&result,
1198 thread_group,
1199 group,
1200 vmSymbols::add_method_name(),
1201 vmSymbols::thread_void_signature(),
1202 threadObj, // Arg 1
1203 THREAD);
1204
1205
1206 }
1207
1208 // NamedThread -- non-JavaThread subclasses with multiple
1209 // uniquely named instances should derive from this.
1210 NamedThread::NamedThread() : Thread() {
1211 _name = NULL;
1212 _processed_thread = NULL;
1213 }
1214
1215 NamedThread::~NamedThread() {
1216 if (_name != NULL) {
1217 FREE_C_HEAP_ARRAY(char, _name, mtThread);
1218 _name = NULL;
1219 }
1220 }
1221
1222 void NamedThread::set_name(const char* format, ...) {
1223 guarantee(_name == NULL, "Only get to set name once.");
1224 _name = NEW_C_HEAP_ARRAY(char, max_name_len, mtThread);
1225 guarantee(_name != NULL, "alloc failure");
1226 va_list ap;
1227 va_start(ap, format);
1228 jio_vsnprintf(_name, max_name_len, format, ap);
1229 va_end(ap);
1230 }
1231
1232 // ======= WatcherThread ========
1233
1234 // The watcher thread exists to simulate timer interrupts. It should
1235 // be replaced by an abstraction over whatever native support for
1236 // timer interrupts exists on the platform.
1237
1238 WatcherThread* WatcherThread::_watcher_thread = NULL;
1239 bool WatcherThread::_startable = false;
1240 volatile bool WatcherThread::_should_terminate = false;
1241
1242 WatcherThread::WatcherThread() : Thread(), _crash_protection(NULL) {
1243 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread");
1244 if (os::create_thread(this, os::watcher_thread)) {
1245 _watcher_thread = this;
1246
1247 // Set the watcher thread to the highest OS priority which should not be
1248 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY
1249 // is created. The only normal thread using this priority is the reference
1250 // handler thread, which runs for very short intervals only.
1251 // If the VMThread's priority is not lower than the WatcherThread profiling
1252 // will be inaccurate.
1253 os::set_priority(this, MaxPriority);
1254 if (!DisableStartThread) {
1255 os::start_thread(this);
1256 }
1257 }
1258 }
1259
1260 int WatcherThread::sleep() const {
1261 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag);
1262
1263 // remaining will be zero if there are no tasks,
1264 // causing the WatcherThread to sleep until a task is
1265 // enrolled
1266 int remaining = PeriodicTask::time_to_wait();
1267 int time_slept = 0;
1268
1269 // we expect this to timeout - we only ever get unparked when
1270 // we should terminate or when a new task has been enrolled
1271 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */);
1272
1273 jlong time_before_loop = os::javaTimeNanos();
1274
1275 for (;;) {
1276 bool timedout = PeriodicTask_lock->wait(Mutex::_no_safepoint_check_flag, remaining);
1277 jlong now = os::javaTimeNanos();
1278
1279 if (remaining == 0) {
1280 // if we didn't have any tasks we could have waited for a long time
1281 // consider the time_slept zero and reset time_before_loop
1282 time_slept = 0;
1283 time_before_loop = now;
1284 } else {
1285 // need to recalulate since we might have new tasks in _tasks
1286 time_slept = (int) ((now - time_before_loop) / 1000000);
1287 }
1288
1289 // Change to task list or spurious wakeup of some kind
1290 if (timedout || _should_terminate) {
1291 break;
1292 }
1293
1294 remaining = PeriodicTask::time_to_wait();
1295 if (remaining == 0) {
1296 // Last task was just disenrolled so loop around and wait until
1297 // another task gets enrolled
1298 continue;
1299 }
1300
1301 remaining -= time_slept;
1302 if (remaining <= 0)
1303 break;
1304 }
1305
1306 return time_slept;
1307 }
1308
1309 void WatcherThread::run() {
1310 assert(this == watcher_thread(), "just checking");
1311
1312 this->record_stack_base_and_size();
1313 this->initialize_thread_local_storage();
1314 this->set_active_handles(JNIHandleBlock::allocate_block());
1315 while(!_should_terminate) {
1316 assert(watcher_thread() == Thread::current(), "thread consistency check");
1317 assert(watcher_thread() == this, "thread consistency check");
1318
1319 // Calculate how long it'll be until the next PeriodicTask work
1320 // should be done, and sleep that amount of time.
1321 int time_waited = sleep();
1322
1323 if (is_error_reported()) {
1324 // A fatal error has happened, the error handler(VMError::report_and_die)
1325 // should abort JVM after creating an error log file. However in some
1326 // rare cases, the error handler itself might deadlock. Here we try to
1327 // kill JVM if the fatal error handler fails to abort in 2 minutes.
1328 //
1329 // This code is in WatcherThread because WatcherThread wakes up
1330 // periodically so the fatal error handler doesn't need to do anything;
1331 // also because the WatcherThread is less likely to crash than other
1332 // threads.
1333
1334 for (;;) {
1335 if (!ShowMessageBoxOnError
1336 && (OnError == NULL || OnError[0] == '\0')
1337 && Arguments::abort_hook() == NULL) {
1338 os::sleep(this, 2 * 60 * 1000, false);
1339 fdStream err(defaultStream::output_fd());
1340 err.print_raw_cr("# [ timer expired, abort... ]");
1341 // skip atexit/vm_exit/vm_abort hooks
1342 os::die();
1343 }
1344
1345 // Wake up 5 seconds later, the fatal handler may reset OnError or
1346 // ShowMessageBoxOnError when it is ready to abort.
1347 os::sleep(this, 5 * 1000, false);
1348 }
1349 }
1350
1351 PeriodicTask::real_time_tick(time_waited);
1352 }
1353
1354 // Signal that it is terminated
1355 {
1356 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag);
1357 _watcher_thread = NULL;
1358 Terminator_lock->notify();
1359 }
1360
1361 // Thread destructor usually does this..
1362 ThreadLocalStorage::set_thread(NULL);
1363 }
1364
1365 void WatcherThread::start() {
1366 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required");
1367
1368 if (watcher_thread() == NULL && _startable) {
1369 _should_terminate = false;
1370 // Create the single instance of WatcherThread
1371 new WatcherThread();
1372 }
1373 }
1374
1375 void WatcherThread::make_startable() {
1376 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required");
1377 _startable = true;
1378 }
1379
1380 void WatcherThread::stop() {
1381 {
1382 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag);
1383 _should_terminate = true;
1384 OrderAccess::fence(); // ensure WatcherThread sees update in main loop
1385
1386 WatcherThread* watcher = watcher_thread();
1387 if (watcher != NULL)
1388 watcher->unpark();
1389 }
1390
1391 // it is ok to take late safepoints here, if needed
1392 MutexLocker mu(Terminator_lock);
1393
1394 while(watcher_thread() != NULL) {
1395 // This wait should make safepoint checks, wait without a timeout,
1396 // and wait as a suspend-equivalent condition.
1397 //
1398 // Note: If the FlatProfiler is running, then this thread is waiting
1399 // for the WatcherThread to terminate and the WatcherThread, via the
1400 // FlatProfiler task, is waiting for the external suspend request on
1401 // this thread to complete. wait_for_ext_suspend_completion() will
1402 // eventually timeout, but that takes time. Making this wait a
1403 // suspend-equivalent condition solves that timeout problem.
1404 //
1405 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0,
1406 Mutex::_as_suspend_equivalent_flag);
1407 }
1408 }
1409
1410 void WatcherThread::unpark() {
1411 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ? NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag);
1412 PeriodicTask_lock->notify();
1413 }
1414
1415 void WatcherThread::print_on(outputStream* st) const {
1416 st->print("\"%s\" ", name());
1417 Thread::print_on(st);
1418 st->cr();
1419 }
1420
1421 // ======= JavaThread ========
1422
1423 #ifdef GRAAL
1424
1425 jlong* JavaThread::_graal_old_thread_counters;
1426
1427 bool graal_counters_include(oop threadObj) {
1428 return !GraalCountersExcludeCompiler || threadObj == NULL || threadObj->klass() != SystemDictionary::CompilerThread_klass();
1429 }
1430
1431 void JavaThread::collect_counters(typeArrayOop array) {
1432 if (GraalCounterSize > 0) {
1433 MutexLocker tl(Threads_lock);
1434 for (int i = 0; i < array->length(); i++) {
1435 array->long_at_put(i, _graal_old_thread_counters[i]);
1436 }
1437 for (JavaThread* tp = Threads::first(); tp != NULL; tp = tp->next()) {
1438 if (graal_counters_include(tp->threadObj())) {
1439 for (int i = 0; i < array->length(); i++) {
1440 array->long_at_put(i, array->long_at(i) + tp->_graal_counters[i]);
1441 }
1442 }
1443 }
1444 }
1445 }
1446
1447 #endif // GRAAL
1448
1449 // A JavaThread is a normal Java thread
1450
1451 void JavaThread::initialize() {
1452 // Initialize fields
1453
1454 // Set the claimed par_id to -1 (ie not claiming any par_ids)
1455 set_claimed_par_id(-1);
1456
1457 _buffer_blob = NULL;
1458 set_saved_exception_pc(NULL);
1459 set_threadObj(NULL);
1460 _anchor.clear();
1461 set_entry_point(NULL);
1462 set_jni_functions(jni_functions());
1463 set_callee_target(NULL);
1464 set_vm_result(NULL);
1465 set_vm_result_2(NULL);
1466 set_vframe_array_head(NULL);
1467 set_vframe_array_last(NULL);
1468 set_deferred_locals(NULL);
1469 set_deopt_mark(NULL);
1470 set_deopt_nmethod(NULL);
1471 clear_must_deopt_id();
1472 set_monitor_chunks(NULL);
1473 set_next(NULL);
1474 #ifdef GRAAL
1475 set_gpu_exception_bci(0);
1476 set_gpu_exception_method(NULL);
1477 set_gpu_hsail_deopt_info(NULL);
1478 _gpu_hsail_tlabs_count = 0;
1479 _gpu_hsail_tlabs = NULL;
1480 #endif
1481 set_thread_state(_thread_new);
1482 #if INCLUDE_NMT
1483 set_recorder(NULL);
1484 #endif
1485 _terminated = _not_terminated;
1486 _privileged_stack_top = NULL;
1487 _array_for_gc = NULL;
1488 _suspend_equivalent = false;
1489 _in_deopt_handler = 0;
1490 _doing_unsafe_access = false;
1491 _stack_guard_state = stack_guard_unused;
1492 #ifdef GRAAL
1493 _graal_alternate_call_target = NULL;
1494 _graal_implicit_exception_pc = NULL;
1495 if (GraalCounterSize > 0) {
1496 _graal_counters = NEW_C_HEAP_ARRAY(jlong, GraalCounterSize, mtInternal);
1497 memset(_graal_counters, 0, sizeof(jlong) * GraalCounterSize);
1498 } else {
1499 _graal_counters = NULL;
1500 }
1501 #endif // GRAAL
1502 (void)const_cast<oop&>(_exception_oop = NULL);
1503 _exception_pc = 0;
1504 _exception_handler_pc = 0;
1505 _is_method_handle_return = 0;
1506 _jvmti_thread_state= NULL;
1507 _should_post_on_exceptions_flag = JNI_FALSE;
1508 _jvmti_get_loaded_classes_closure = NULL;
1509 _interp_only_mode = 0;
1510 _special_runtime_exit_condition = _no_async_condition;
1511 _pending_async_exception = NULL;
1512 _thread_stat = NULL;
1513 _thread_stat = new ThreadStatistics();
1514 _blocked_on_compilation = false;
1515 _jni_active_critical = 0;
1516 _do_not_unlock_if_synchronized = false;
1517 _cached_monitor_info = NULL;
1518 _parker = Parker::Allocate(this) ;
1519 _scanned_nmethod = NULL;
1520
1521 #ifndef PRODUCT
1522 _jmp_ring_index = 0;
1523 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) {
1524 record_jump(NULL, NULL, NULL, 0);
1525 }
1526 #endif /* PRODUCT */
1527
1528 set_thread_profiler(NULL);
1529 if (FlatProfiler::is_active()) {
1530 // This is where we would decide to either give each thread it's own profiler
1531 // or use one global one from FlatProfiler,
1532 // or up to some count of the number of profiled threads, etc.
1533 ThreadProfiler* pp = new ThreadProfiler();
1534 pp->engage();
1535 set_thread_profiler(pp);
1536 }
1537
1538 // Setup safepoint state info for this thread
1539 ThreadSafepointState::create(this);
1540
1541 debug_only(_java_call_counter = 0);
1542
1543 // JVMTI PopFrame support
1544 _popframe_condition = popframe_inactive;
1545 _popframe_preserved_args = NULL;
1546 _popframe_preserved_args_size = 0;
1547
1548 pd_initialize();
1549 }
1550
1551 #if INCLUDE_ALL_GCS
1552 SATBMarkQueueSet JavaThread::_satb_mark_queue_set;
1553 DirtyCardQueueSet JavaThread::_dirty_card_queue_set;
1554 #endif // INCLUDE_ALL_GCS
1555
1556 JavaThread::JavaThread(bool is_attaching_via_jni) :
1557 Thread()
1558 #if INCLUDE_ALL_GCS
1559 , _satb_mark_queue(&_satb_mark_queue_set),
1560 _dirty_card_queue(&_dirty_card_queue_set)
1561 #endif // INCLUDE_ALL_GCS
1562 {
1563 initialize();
1564 if (is_attaching_via_jni) {
1565 _jni_attach_state = _attaching_via_jni;
1566 } else {
1567 _jni_attach_state = _not_attaching_via_jni;
1568 }
1569 assert(deferred_card_mark().is_empty(), "Default MemRegion ctor");
1570 _safepoint_visible = false;
1571 }
1572
1573 bool JavaThread::reguard_stack(address cur_sp) {
1574 if (_stack_guard_state != stack_guard_yellow_disabled) {
1575 return true; // Stack already guarded or guard pages not needed.
1576 }
1577
1578 if (register_stack_overflow()) {
1579 // For those architectures which have separate register and
1580 // memory stacks, we must check the register stack to see if
1581 // it has overflowed.
1582 return false;
1583 }
1584
1585 // Java code never executes within the yellow zone: the latter is only
1586 // there to provoke an exception during stack banging. If java code
1587 // is executing there, either StackShadowPages should be larger, or
1588 // some exception code in c1, c2 or the interpreter isn't unwinding
1589 // when it should.
1590 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages");
1591
1592 enable_stack_yellow_zone();
1593 return true;
1594 }
1595
1596 bool JavaThread::reguard_stack(void) {
1597 return reguard_stack(os::current_stack_pointer());
1598 }
1599
1600
1601 void JavaThread::block_if_vm_exited() {
1602 if (_terminated == _vm_exited) {
1603 // _vm_exited is set at safepoint, and Threads_lock is never released
1604 // we will block here forever
1605 Threads_lock->lock_without_safepoint_check();
1606 ShouldNotReachHere();
1607 }
1608 }
1609
1610
1611 // Remove this ifdef when C1 is ported to the compiler interface.
1612 static void compiler_thread_entry(JavaThread* thread, TRAPS);
1613
1614 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) :
1615 Thread()
1616 #if INCLUDE_ALL_GCS
1617 , _satb_mark_queue(&_satb_mark_queue_set),
1618 _dirty_card_queue(&_dirty_card_queue_set)
1619 #endif // INCLUDE_ALL_GCS
1620 {
1621 if (TraceThreadEvents) {
1622 tty->print_cr("creating thread %p", this);
1623 }
1624 initialize();
1625 _jni_attach_state = _not_attaching_via_jni;
1626 set_entry_point(entry_point);
1627 // Create the native thread itself.
1628 // %note runtime_23
1629 os::ThreadType thr_type = os::java_thread;
1630 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread :
1631 os::java_thread;
1632 os::create_thread(this, thr_type, stack_sz);
1633 _safepoint_visible = false;
1634 // The _osthread may be NULL here because we ran out of memory (too many threads active).
1635 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller
1636 // may hold a lock and all locks must be unlocked before throwing the exception (throwing
1637 // the exception consists of creating the exception object & initializing it, initialization
1638 // will leave the VM via a JavaCall and then all locks must be unlocked).
1639 //
1640 // The thread is still suspended when we reach here. Thread must be explicit started
1641 // by creator! Furthermore, the thread must also explicitly be added to the Threads list
1642 // by calling Threads:add. The reason why this is not done here, is because the thread
1643 // object must be fully initialized (take a look at JVM_Start)
1644 }
1645
1646 JavaThread::~JavaThread() {
1647 if (TraceThreadEvents) {
1648 tty->print_cr("terminate thread %p", this);
1649 }
1650
1651 // By now, this thread should already be invisible to safepoint,
1652 // and its per-thread recorder also collected.
1653 assert(!is_safepoint_visible(), "wrong state");
1654 #if INCLUDE_NMT
1655 assert(get_recorder() == NULL, "Already collected");
1656 #endif // INCLUDE_NMT
1657
1658 // JSR166 -- return the parker to the free list
1659 Parker::Release(_parker);
1660 _parker = NULL ;
1661
1662 // Free any remaining previous UnrollBlock
1663 vframeArray* old_array = vframe_array_last();
1664
1665 if (old_array != NULL) {
1666 Deoptimization::UnrollBlock* old_info = old_array->unroll_block();
1667 old_array->set_unroll_block(NULL);
1668 delete old_info;
1669 delete old_array;
1670 }
1671
1672 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals();
1673 if (deferred != NULL) {
1674 // This can only happen if thread is destroyed before deoptimization occurs.
1675 assert(deferred->length() != 0, "empty array!");
1676 do {
1677 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0);
1678 deferred->remove_at(0);
1679 // individual jvmtiDeferredLocalVariableSet are CHeapObj's
1680 delete dlv;
1681 } while (deferred->length() != 0);
1682 delete deferred;
1683 }
1684
1685 // All Java related clean up happens in exit
1686 ThreadSafepointState::destroy(this);
1687 if (_thread_profiler != NULL) delete _thread_profiler;
1688 if (_thread_stat != NULL) delete _thread_stat;
1689
1690 #ifdef GRAAL
1691 if (GraalCounterSize > 0) {
1692 if (graal_counters_include(threadObj())) {
1693 for (int i = 0; i < GraalCounterSize; i++) {
1694 _graal_old_thread_counters[i] += _graal_counters[i];
1695 }
1696 }
1697 FREE_C_HEAP_ARRAY(jlong, _graal_counters, mtInternal);
1698 }
1699
1700 delete_gpu_hsail_tlabs();
1701 #endif // GRAAL
1702 }
1703
1704
1705 // The first routine called by a new Java thread
1706 void JavaThread::run() {
1707 // initialize thread-local alloc buffer related fields
1708 this->initialize_tlab();
1709
1710 // used to test validitity of stack trace backs
1711 this->record_base_of_stack_pointer();
1712
1713 // Record real stack base and size.
1714 this->record_stack_base_and_size();
1715
1716 // Initialize thread local storage; set before calling MutexLocker
1717 this->initialize_thread_local_storage();
1718
1719 this->create_stack_guard_pages();
1720
1721 this->cache_global_variables();
1722
1723 // Thread is now sufficient initialized to be handled by the safepoint code as being
1724 // in the VM. Change thread state from _thread_new to _thread_in_vm
1725 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm);
1726
1727 assert(JavaThread::current() == this, "sanity check");
1728 assert(!Thread::current()->owns_locks(), "sanity check");
1729
1730 DTRACE_THREAD_PROBE(start, this);
1731
1732 // This operation might block. We call that after all safepoint checks for a new thread has
1733 // been completed.
1734 this->set_active_handles(JNIHandleBlock::allocate_block());
1735
1736 if (JvmtiExport::should_post_thread_life()) {
1737 JvmtiExport::post_thread_start(this);
1738 }
1739
1740 EventThreadStart event;
1741 if (event.should_commit()) {
1742 event.set_javalangthread(java_lang_Thread::thread_id(this->threadObj()));
1743 event.commit();
1744 }
1745
1746 // We call another function to do the rest so we are sure that the stack addresses used
1747 // from there will be lower than the stack base just computed
1748 thread_main_inner();
1749
1750 // Note, thread is no longer valid at this point!
1751 }
1752
1753
1754 void JavaThread::thread_main_inner() {
1755 assert(JavaThread::current() == this, "sanity check");
1756 assert(this->threadObj() != NULL, "just checking");
1757
1758 // Execute thread entry point unless this thread has a pending exception
1759 // or has been stopped before starting.
1760 // Note: Due to JVM_StopThread we can have pending exceptions already!
1761 if (!this->has_pending_exception() &&
1762 !java_lang_Thread::is_stillborn(this->threadObj())) {
1763 {
1764 ResourceMark rm(this);
1765 this->set_native_thread_name(this->get_thread_name());
1766 }
1767 HandleMark hm(this);
1768 this->entry_point()(this, this);
1769 }
1770
1771 DTRACE_THREAD_PROBE(stop, this);
1772
1773 this->exit(false);
1774 delete this;
1775 }
1776
1777
1778 static void ensure_join(JavaThread* thread) {
1779 // We do not need to grap the Threads_lock, since we are operating on ourself.
1780 Handle threadObj(thread, thread->threadObj());
1781 assert(threadObj.not_null(), "java thread object must exist");
1782 ObjectLocker lock(threadObj, thread);
1783 // Ignore pending exception (ThreadDeath), since we are exiting anyway
1784 thread->clear_pending_exception();
1785 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED.
1786 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED);
1787 // Clear the native thread instance - this makes isAlive return false and allows the join()
1788 // to complete once we've done the notify_all below
1789 java_lang_Thread::set_thread(threadObj(), NULL);
1790 lock.notify_all(thread);
1791 // Ignore pending exception (ThreadDeath), since we are exiting anyway
1792 thread->clear_pending_exception();
1793 }
1794
1795
1796 // For any new cleanup additions, please check to see if they need to be applied to
1797 // cleanup_failed_attach_current_thread as well.
1798 void JavaThread::exit(bool destroy_vm, ExitType exit_type) {
1799 assert(this == JavaThread::current(), "thread consistency check");
1800
1801 HandleMark hm(this);
1802 Handle uncaught_exception(this, this->pending_exception());
1803 this->clear_pending_exception();
1804 Handle threadObj(this, this->threadObj());
1805 assert(threadObj.not_null(), "Java thread object should be created");
1806
1807 if (get_thread_profiler() != NULL) {
1808 get_thread_profiler()->disengage();
1809 ResourceMark rm;
1810 get_thread_profiler()->print(get_thread_name());
1811 }
1812
1813
1814 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place
1815 {
1816 EXCEPTION_MARK;
1817
1818 CLEAR_PENDING_EXCEPTION;
1819 }
1820 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This
1821 // has to be fixed by a runtime query method
1822 if (!destroy_vm || JDK_Version::is_jdk12x_version()) {
1823 // JSR-166: change call from from ThreadGroup.uncaughtException to
1824 // java.lang.Thread.dispatchUncaughtException
1825 if (uncaught_exception.not_null()) {
1826 Handle group(this, java_lang_Thread::threadGroup(threadObj()));
1827 {
1828 EXCEPTION_MARK;
1829 // Check if the method Thread.dispatchUncaughtException() exists. If so
1830 // call it. Otherwise we have an older library without the JSR-166 changes,
1831 // so call ThreadGroup.uncaughtException()
1832 KlassHandle recvrKlass(THREAD, threadObj->klass());
1833 CallInfo callinfo;
1834 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass());
1835 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass,
1836 vmSymbols::dispatchUncaughtException_name(),
1837 vmSymbols::throwable_void_signature(),
1838 KlassHandle(), false, false, THREAD);
1839 CLEAR_PENDING_EXCEPTION;
1840 methodHandle method = callinfo.selected_method();
1841 if (method.not_null()) {
1842 JavaValue result(T_VOID);
1843 JavaCalls::call_virtual(&result,
1844 threadObj, thread_klass,
1845 vmSymbols::dispatchUncaughtException_name(),
1846 vmSymbols::throwable_void_signature(),
1847 uncaught_exception,
1848 THREAD);
1849 } else {
1850 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass());
1851 JavaValue result(T_VOID);
1852 JavaCalls::call_virtual(&result,
1853 group, thread_group,
1854 vmSymbols::uncaughtException_name(),
1855 vmSymbols::thread_throwable_void_signature(),
1856 threadObj, // Arg 1
1857 uncaught_exception, // Arg 2
1858 THREAD);
1859 }
1860 if (HAS_PENDING_EXCEPTION) {
1861 ResourceMark rm(this);
1862 jio_fprintf(defaultStream::error_stream(),
1863 "\nException: %s thrown from the UncaughtExceptionHandler"
1864 " in thread \"%s\"\n",
1865 pending_exception()->klass()->external_name(),
1866 get_thread_name());
1867 CLEAR_PENDING_EXCEPTION;
1868 }
1869 }
1870 }
1871
1872 // Called before the java thread exit since we want to read info
1873 // from java_lang_Thread object
1874 EventThreadEnd event;
1875 if (event.should_commit()) {
1876 event.set_javalangthread(java_lang_Thread::thread_id(this->threadObj()));
1877 event.commit();
1878 }
1879
1880 // Call after last event on thread
1881 EVENT_THREAD_EXIT(this);
1882
1883 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during
1884 // the execution of the method. If that is not enough, then we don't really care. Thread.stop
1885 // is deprecated anyhow.
1886 if (!is_Compiler_thread()) {
1887 int count = 3;
1888 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) {
1889 EXCEPTION_MARK;
1890 JavaValue result(T_VOID);
1891 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass());
1892 JavaCalls::call_virtual(&result,
1893 threadObj, thread_klass,
1894 vmSymbols::exit_method_name(),
1895 vmSymbols::void_method_signature(),
1896 THREAD);
1897 CLEAR_PENDING_EXCEPTION;
1898 }
1899 }
1900 // notify JVMTI
1901 if (JvmtiExport::should_post_thread_life()) {
1902 JvmtiExport::post_thread_end(this);
1903 }
1904
1905 // We have notified the agents that we are exiting, before we go on,
1906 // we must check for a pending external suspend request and honor it
1907 // in order to not surprise the thread that made the suspend request.
1908 while (true) {
1909 {
1910 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
1911 if (!is_external_suspend()) {
1912 set_terminated(_thread_exiting);
1913 ThreadService::current_thread_exiting(this);
1914 break;
1915 }
1916 // Implied else:
1917 // Things get a little tricky here. We have a pending external
1918 // suspend request, but we are holding the SR_lock so we
1919 // can't just self-suspend. So we temporarily drop the lock
1920 // and then self-suspend.
1921 }
1922
1923 ThreadBlockInVM tbivm(this);
1924 java_suspend_self();
1925
1926 // We're done with this suspend request, but we have to loop around
1927 // and check again. Eventually we will get SR_lock without a pending
1928 // external suspend request and will be able to mark ourselves as
1929 // exiting.
1930 }
1931 // no more external suspends are allowed at this point
1932 } else {
1933 // before_exit() has already posted JVMTI THREAD_END events
1934 }
1935
1936 // Notify waiters on thread object. This has to be done after exit() is called
1937 // on the thread (if the thread is the last thread in a daemon ThreadGroup the
1938 // group should have the destroyed bit set before waiters are notified).
1939 ensure_join(this);
1940 assert(!this->has_pending_exception(), "ensure_join should have cleared");
1941
1942 // 6282335 JNI DetachCurrentThread spec states that all Java monitors
1943 // held by this thread must be released. A detach operation must only
1944 // get here if there are no Java frames on the stack. Therefore, any
1945 // owned monitors at this point MUST be JNI-acquired monitors which are
1946 // pre-inflated and in the monitor cache.
1947 //
1948 // ensure_join() ignores IllegalThreadStateExceptions, and so does this.
1949 if (exit_type == jni_detach && JNIDetachReleasesMonitors) {
1950 assert(!this->has_last_Java_frame(), "detaching with Java frames?");
1951 ObjectSynchronizer::release_monitors_owned_by_thread(this);
1952 assert(!this->has_pending_exception(), "release_monitors should have cleared");
1953 }
1954
1955 // These things needs to be done while we are still a Java Thread. Make sure that thread
1956 // is in a consistent state, in case GC happens
1957 assert(_privileged_stack_top == NULL, "must be NULL when we get here");
1958
1959 if (active_handles() != NULL) {
1960 JNIHandleBlock* block = active_handles();
1961 set_active_handles(NULL);
1962 JNIHandleBlock::release_block(block);
1963 }
1964
1965 if (free_handle_block() != NULL) {
1966 JNIHandleBlock* block = free_handle_block();
1967 set_free_handle_block(NULL);
1968 JNIHandleBlock::release_block(block);
1969 }
1970
1971 // These have to be removed while this is still a valid thread.
1972 remove_stack_guard_pages();
1973
1974 if (UseTLAB) {
1975 tlab().make_parsable(true); // retire TLAB
1976 }
1977
1978 if (JvmtiEnv::environments_might_exist()) {
1979 JvmtiExport::cleanup_thread(this);
1980 }
1981
1982 // We must flush any deferred card marks before removing a thread from
1983 // the list of active threads.
1984 Universe::heap()->flush_deferred_store_barrier(this);
1985 assert(deferred_card_mark().is_empty(), "Should have been flushed");
1986
1987 #if INCLUDE_ALL_GCS
1988 // We must flush the G1-related buffers before removing a thread
1989 // from the list of active threads. We must do this after any deferred
1990 // card marks have been flushed (above) so that any entries that are
1991 // added to the thread's dirty card queue as a result are not lost.
1992 if (UseG1GC) {
1993 flush_barrier_queues();
1994 }
1995 #endif // INCLUDE_ALL_GCS
1996
1997 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread
1998 Threads::remove(this);
1999 }
2000
2001 #if INCLUDE_ALL_GCS
2002 // Flush G1-related queues.
2003 void JavaThread::flush_barrier_queues() {
2004 satb_mark_queue().flush();
2005 dirty_card_queue().flush();
2006 }
2007
2008 void JavaThread::initialize_queues() {
2009 assert(!SafepointSynchronize::is_at_safepoint(),
2010 "we should not be at a safepoint");
2011
2012 ObjPtrQueue& satb_queue = satb_mark_queue();
2013 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set();
2014 // The SATB queue should have been constructed with its active
2015 // field set to false.
2016 assert(!satb_queue.is_active(), "SATB queue should not be active");
2017 assert(satb_queue.is_empty(), "SATB queue should be empty");
2018 // If we are creating the thread during a marking cycle, we should
2019 // set the active field of the SATB queue to true.
2020 if (satb_queue_set.is_active()) {
2021 satb_queue.set_active(true);
2022 }
2023
2024 DirtyCardQueue& dirty_queue = dirty_card_queue();
2025 // The dirty card queue should have been constructed with its
2026 // active field set to true.
2027 assert(dirty_queue.is_active(), "dirty card queue should be active");
2028 }
2029 #endif // INCLUDE_ALL_GCS
2030
2031 void JavaThread::cleanup_failed_attach_current_thread() {
2032 if (get_thread_profiler() != NULL) {
2033 get_thread_profiler()->disengage();
2034 ResourceMark rm;
2035 get_thread_profiler()->print(get_thread_name());
2036 }
2037
2038 if (active_handles() != NULL) {
2039 JNIHandleBlock* block = active_handles();
2040 set_active_handles(NULL);
2041 JNIHandleBlock::release_block(block);
2042 }
2043
2044 if (free_handle_block() != NULL) {
2045 JNIHandleBlock* block = free_handle_block();
2046 set_free_handle_block(NULL);
2047 JNIHandleBlock::release_block(block);
2048 }
2049
2050 // These have to be removed while this is still a valid thread.
2051 remove_stack_guard_pages();
2052
2053 if (UseTLAB) {
2054 tlab().make_parsable(true); // retire TLAB, if any
2055 }
2056
2057 #if INCLUDE_ALL_GCS
2058 if (UseG1GC) {
2059 flush_barrier_queues();
2060 }
2061 #endif // INCLUDE_ALL_GCS
2062
2063 Threads::remove(this);
2064 delete this;
2065 }
2066
2067
2068
2069
2070 JavaThread* JavaThread::active() {
2071 Thread* thread = ThreadLocalStorage::thread();
2072 assert(thread != NULL, "just checking");
2073 if (thread->is_Java_thread()) {
2074 return (JavaThread*) thread;
2075 } else {
2076 assert(thread->is_VM_thread(), "this must be a vm thread");
2077 VM_Operation* op = ((VMThread*) thread)->vm_operation();
2078 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread();
2079 assert(ret->is_Java_thread(), "must be a Java thread");
2080 return ret;
2081 }
2082 }
2083
2084 bool JavaThread::is_lock_owned(address adr) const {
2085 if (Thread::is_lock_owned(adr)) return true;
2086
2087 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) {
2088 if (chunk->contains(adr)) return true;
2089 }
2090
2091 return false;
2092 }
2093
2094
2095 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) {
2096 chunk->set_next(monitor_chunks());
2097 set_monitor_chunks(chunk);
2098 }
2099
2100 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) {
2101 guarantee(monitor_chunks() != NULL, "must be non empty");
2102 if (monitor_chunks() == chunk) {
2103 set_monitor_chunks(chunk->next());
2104 } else {
2105 MonitorChunk* prev = monitor_chunks();
2106 while (prev->next() != chunk) prev = prev->next();
2107 prev->set_next(chunk->next());
2108 }
2109 }
2110
2111 // JVM support.
2112
2113 // Note: this function shouldn't block if it's called in
2114 // _thread_in_native_trans state (such as from
2115 // check_special_condition_for_native_trans()).
2116 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) {
2117
2118 if (has_last_Java_frame() && has_async_condition()) {
2119 // If we are at a polling page safepoint (not a poll return)
2120 // then we must defer async exception because live registers
2121 // will be clobbered by the exception path. Poll return is
2122 // ok because the call we a returning from already collides
2123 // with exception handling registers and so there is no issue.
2124 // (The exception handling path kills call result registers but
2125 // this is ok since the exception kills the result anyway).
2126
2127 if (is_at_poll_safepoint()) {
2128 // if the code we are returning to has deoptimized we must defer
2129 // the exception otherwise live registers get clobbered on the
2130 // exception path before deoptimization is able to retrieve them.
2131 //
2132 RegisterMap map(this, false);
2133 frame caller_fr = last_frame().sender(&map);
2134 assert(caller_fr.is_compiled_frame(), "what?");
2135 if (caller_fr.is_deoptimized_frame()) {
2136 if (TraceExceptions) {
2137 ResourceMark rm;
2138 tty->print_cr("deferred async exception at compiled safepoint");
2139 }
2140 return;
2141 }
2142 }
2143 }
2144
2145 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition();
2146 if (condition == _no_async_condition) {
2147 // Conditions have changed since has_special_runtime_exit_condition()
2148 // was called:
2149 // - if we were here only because of an external suspend request,
2150 // then that was taken care of above (or cancelled) so we are done
2151 // - if we were here because of another async request, then it has
2152 // been cleared between the has_special_runtime_exit_condition()
2153 // and now so again we are done
2154 return;
2155 }
2156
2157 // Check for pending async. exception
2158 if (_pending_async_exception != NULL) {
2159 // Only overwrite an already pending exception, if it is not a threadDeath.
2160 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) {
2161
2162 // We cannot call Exceptions::_throw(...) here because we cannot block
2163 set_pending_exception(_pending_async_exception, __FILE__, __LINE__);
2164
2165 if (TraceExceptions) {
2166 ResourceMark rm;
2167 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this);
2168 if (has_last_Java_frame() ) {
2169 frame f = last_frame();
2170 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp());
2171 }
2172 tty->print_cr(" of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name());
2173 }
2174 _pending_async_exception = NULL;
2175 clear_has_async_exception();
2176 }
2177 }
2178
2179 if (check_unsafe_error &&
2180 condition == _async_unsafe_access_error && !has_pending_exception()) {
2181 condition = _no_async_condition; // done
2182 switch (thread_state()) {
2183 case _thread_in_vm:
2184 {
2185 JavaThread* THREAD = this;
2186 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation");
2187 }
2188 case _thread_in_native:
2189 {
2190 ThreadInVMfromNative tiv(this);
2191 JavaThread* THREAD = this;
2192 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation");
2193 }
2194 case _thread_in_Java:
2195 {
2196 ThreadInVMfromJava tiv(this);
2197 JavaThread* THREAD = this;
2198 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code");
2199 }
2200 default:
2201 ShouldNotReachHere();
2202 }
2203 }
2204
2205 assert(condition == _no_async_condition || has_pending_exception() ||
2206 (!check_unsafe_error && condition == _async_unsafe_access_error),
2207 "must have handled the async condition, if no exception");
2208 }
2209
2210 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) {
2211 //
2212 // Check for pending external suspend. Internal suspend requests do
2213 // not use handle_special_runtime_exit_condition().
2214 // If JNIEnv proxies are allowed, don't self-suspend if the target
2215 // thread is not the current thread. In older versions of jdbx, jdbx
2216 // threads could call into the VM with another thread's JNIEnv so we
2217 // can be here operating on behalf of a suspended thread (4432884).
2218 bool do_self_suspend = is_external_suspend_with_lock();
2219 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) {
2220 //
2221 // Because thread is external suspended the safepoint code will count
2222 // thread as at a safepoint. This can be odd because we can be here
2223 // as _thread_in_Java which would normally transition to _thread_blocked
2224 // at a safepoint. We would like to mark the thread as _thread_blocked
2225 // before calling java_suspend_self like all other callers of it but
2226 // we must then observe proper safepoint protocol. (We can't leave
2227 // _thread_blocked with a safepoint in progress). However we can be
2228 // here as _thread_in_native_trans so we can't use a normal transition
2229 // constructor/destructor pair because they assert on that type of
2230 // transition. We could do something like:
2231 //
2232 // JavaThreadState state = thread_state();
2233 // set_thread_state(_thread_in_vm);
2234 // {
2235 // ThreadBlockInVM tbivm(this);
2236 // java_suspend_self()
2237 // }
2238 // set_thread_state(_thread_in_vm_trans);
2239 // if (safepoint) block;
2240 // set_thread_state(state);
2241 //
2242 // but that is pretty messy. Instead we just go with the way the
2243 // code has worked before and note that this is the only path to
2244 // java_suspend_self that doesn't put the thread in _thread_blocked
2245 // mode.
2246
2247 frame_anchor()->make_walkable(this);
2248 java_suspend_self();
2249
2250 // We might be here for reasons in addition to the self-suspend request
2251 // so check for other async requests.
2252 }
2253
2254 if (check_asyncs) {
2255 check_and_handle_async_exceptions();
2256 }
2257 }
2258
2259 void JavaThread::send_thread_stop(oop java_throwable) {
2260 assert(Thread::current()->is_VM_thread(), "should be in the vm thread");
2261 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code");
2262 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped");
2263
2264 // Do not throw asynchronous exceptions against the compiler thread
2265 // (the compiler thread should not be a Java thread -- fix in 1.4.2)
2266 if (!can_call_java()) return;
2267
2268 {
2269 // Actually throw the Throwable against the target Thread - however
2270 // only if there is no thread death exception installed already.
2271 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) {
2272 // If the topmost frame is a runtime stub, then we are calling into
2273 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..)
2274 // must deoptimize the caller before continuing, as the compiled exception handler table
2275 // may not be valid
2276 if (has_last_Java_frame()) {
2277 frame f = last_frame();
2278 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) {
2279 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass
2280 RegisterMap reg_map(this, UseBiasedLocking);
2281 frame compiled_frame = f.sender(®_map);
2282 if (!StressCompiledExceptionHandlers && compiled_frame.can_be_deoptimized()) {
2283 Deoptimization::deoptimize(this, compiled_frame, ®_map);
2284 }
2285 }
2286 }
2287
2288 // Set async. pending exception in thread.
2289 set_pending_async_exception(java_throwable);
2290
2291 if (TraceExceptions) {
2292 ResourceMark rm;
2293 tty->print_cr("Pending Async. exception installed of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name());
2294 }
2295 // for AbortVMOnException flag
2296 NOT_PRODUCT(Exceptions::debug_check_abort(InstanceKlass::cast(_pending_async_exception->klass())->external_name()));
2297 }
2298 }
2299
2300
2301 // Interrupt thread so it will wake up from a potential wait()
2302 Thread::interrupt(this);
2303 }
2304
2305 // External suspension mechanism.
2306 //
2307 // Tell the VM to suspend a thread when ever it knows that it does not hold on
2308 // to any VM_locks and it is at a transition
2309 // Self-suspension will happen on the transition out of the vm.
2310 // Catch "this" coming in from JNIEnv pointers when the thread has been freed
2311 //
2312 // Guarantees on return:
2313 // + Target thread will not execute any new bytecode (that's why we need to
2314 // force a safepoint)
2315 // + Target thread will not enter any new monitors
2316 //
2317 void JavaThread::java_suspend() {
2318 { MutexLocker mu(Threads_lock);
2319 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) {
2320 return;
2321 }
2322 }
2323
2324 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
2325 if (!is_external_suspend()) {
2326 // a racing resume has cancelled us; bail out now
2327 return;
2328 }
2329
2330 // suspend is done
2331 uint32_t debug_bits = 0;
2332 // Warning: is_ext_suspend_completed() may temporarily drop the
2333 // SR_lock to allow the thread to reach a stable thread state if
2334 // it is currently in a transient thread state.
2335 if (is_ext_suspend_completed(false /* !called_by_wait */,
2336 SuspendRetryDelay, &debug_bits) ) {
2337 return;
2338 }
2339 }
2340
2341 VM_ForceSafepoint vm_suspend;
2342 VMThread::execute(&vm_suspend);
2343 }
2344
2345 // Part II of external suspension.
2346 // A JavaThread self suspends when it detects a pending external suspend
2347 // request. This is usually on transitions. It is also done in places
2348 // where continuing to the next transition would surprise the caller,
2349 // e.g., monitor entry.
2350 //
2351 // Returns the number of times that the thread self-suspended.
2352 //
2353 // Note: DO NOT call java_suspend_self() when you just want to block current
2354 // thread. java_suspend_self() is the second stage of cooperative
2355 // suspension for external suspend requests and should only be used
2356 // to complete an external suspend request.
2357 //
2358 int JavaThread::java_suspend_self() {
2359 int ret = 0;
2360
2361 // we are in the process of exiting so don't suspend
2362 if (is_exiting()) {
2363 clear_external_suspend();
2364 return ret;
2365 }
2366
2367 assert(_anchor.walkable() ||
2368 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()),
2369 "must have walkable stack");
2370
2371 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
2372
2373 assert(!this->is_ext_suspended(),
2374 "a thread trying to self-suspend should not already be suspended");
2375
2376 if (this->is_suspend_equivalent()) {
2377 // If we are self-suspending as a result of the lifting of a
2378 // suspend equivalent condition, then the suspend_equivalent
2379 // flag is not cleared until we set the ext_suspended flag so
2380 // that wait_for_ext_suspend_completion() returns consistent
2381 // results.
2382 this->clear_suspend_equivalent();
2383 }
2384
2385 // A racing resume may have cancelled us before we grabbed SR_lock
2386 // above. Or another external suspend request could be waiting for us
2387 // by the time we return from SR_lock()->wait(). The thread
2388 // that requested the suspension may already be trying to walk our
2389 // stack and if we return now, we can change the stack out from under
2390 // it. This would be a "bad thing (TM)" and cause the stack walker
2391 // to crash. We stay self-suspended until there are no more pending
2392 // external suspend requests.
2393 while (is_external_suspend()) {
2394 ret++;
2395 this->set_ext_suspended();
2396
2397 // _ext_suspended flag is cleared by java_resume()
2398 while (is_ext_suspended()) {
2399 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag);
2400 }
2401 }
2402
2403 return ret;
2404 }
2405
2406 #ifdef ASSERT
2407 // verify the JavaThread has not yet been published in the Threads::list, and
2408 // hence doesn't need protection from concurrent access at this stage
2409 void JavaThread::verify_not_published() {
2410 if (!Threads_lock->owned_by_self()) {
2411 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag);
2412 assert( !Threads::includes(this),
2413 "java thread shouldn't have been published yet!");
2414 }
2415 else {
2416 assert( !Threads::includes(this),
2417 "java thread shouldn't have been published yet!");
2418 }
2419 }
2420 #endif
2421
2422 // Slow path when the native==>VM/Java barriers detect a safepoint is in
2423 // progress or when _suspend_flags is non-zero.
2424 // Current thread needs to self-suspend if there is a suspend request and/or
2425 // block if a safepoint is in progress.
2426 // Async exception ISN'T checked.
2427 // Note only the ThreadInVMfromNative transition can call this function
2428 // directly and when thread state is _thread_in_native_trans
2429 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) {
2430 assert(thread->thread_state() == _thread_in_native_trans, "wrong state");
2431
2432 JavaThread *curJT = JavaThread::current();
2433 bool do_self_suspend = thread->is_external_suspend();
2434
2435 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition");
2436
2437 // If JNIEnv proxies are allowed, don't self-suspend if the target
2438 // thread is not the current thread. In older versions of jdbx, jdbx
2439 // threads could call into the VM with another thread's JNIEnv so we
2440 // can be here operating on behalf of a suspended thread (4432884).
2441 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) {
2442 JavaThreadState state = thread->thread_state();
2443
2444 // We mark this thread_blocked state as a suspend-equivalent so
2445 // that a caller to is_ext_suspend_completed() won't be confused.
2446 // The suspend-equivalent state is cleared by java_suspend_self().
2447 thread->set_suspend_equivalent();
2448
2449 // If the safepoint code sees the _thread_in_native_trans state, it will
2450 // wait until the thread changes to other thread state. There is no
2451 // guarantee on how soon we can obtain the SR_lock and complete the
2452 // self-suspend request. It would be a bad idea to let safepoint wait for
2453 // too long. Temporarily change the state to _thread_blocked to
2454 // let the VM thread know that this thread is ready for GC. The problem
2455 // of changing thread state is that safepoint could happen just after
2456 // java_suspend_self() returns after being resumed, and VM thread will
2457 // see the _thread_blocked state. We must check for safepoint
2458 // after restoring the state and make sure we won't leave while a safepoint
2459 // is in progress.
2460 thread->set_thread_state(_thread_blocked);
2461 thread->java_suspend_self();
2462 thread->set_thread_state(state);
2463 // Make sure new state is seen by VM thread
2464 if (os::is_MP()) {
2465 if (UseMembar) {
2466 // Force a fence between the write above and read below
2467 OrderAccess::fence();
2468 } else {
2469 // Must use this rather than serialization page in particular on Windows
2470 InterfaceSupport::serialize_memory(thread);
2471 }
2472 }
2473 }
2474
2475 if (SafepointSynchronize::do_call_back()) {
2476 // If we are safepointing, then block the caller which may not be
2477 // the same as the target thread (see above).
2478 SafepointSynchronize::block(curJT);
2479 }
2480
2481 if (thread->is_deopt_suspend()) {
2482 thread->clear_deopt_suspend();
2483 RegisterMap map(thread, false);
2484 frame f = thread->last_frame();
2485 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) {
2486 f = f.sender(&map);
2487 }
2488 if (f.id() == thread->must_deopt_id()) {
2489 thread->clear_must_deopt_id();
2490 f.deoptimize(thread);
2491 } else {
2492 fatal("missed deoptimization!");
2493 }
2494 }
2495 }
2496
2497 // Slow path when the native==>VM/Java barriers detect a safepoint is in
2498 // progress or when _suspend_flags is non-zero.
2499 // Current thread needs to self-suspend if there is a suspend request and/or
2500 // block if a safepoint is in progress.
2501 // Also check for pending async exception (not including unsafe access error).
2502 // Note only the native==>VM/Java barriers can call this function and when
2503 // thread state is _thread_in_native_trans.
2504 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) {
2505 check_safepoint_and_suspend_for_native_trans(thread);
2506
2507 if (thread->has_async_exception()) {
2508 // We are in _thread_in_native_trans state, don't handle unsafe
2509 // access error since that may block.
2510 thread->check_and_handle_async_exceptions(false);
2511 }
2512 }
2513
2514 // This is a variant of the normal
2515 // check_special_condition_for_native_trans with slightly different
2516 // semantics for use by critical native wrappers. It does all the
2517 // normal checks but also performs the transition back into
2518 // thread_in_Java state. This is required so that critical natives
2519 // can potentially block and perform a GC if they are the last thread
2520 // exiting the GC_locker.
2521 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) {
2522 check_special_condition_for_native_trans(thread);
2523
2524 // Finish the transition
2525 thread->set_thread_state(_thread_in_Java);
2526
2527 if (thread->do_critical_native_unlock()) {
2528 ThreadInVMfromJavaNoAsyncException tiv(thread);
2529 GC_locker::unlock_critical(thread);
2530 thread->clear_critical_native_unlock();
2531 }
2532 }
2533
2534 // We need to guarantee the Threads_lock here, since resumes are not
2535 // allowed during safepoint synchronization
2536 // Can only resume from an external suspension
2537 void JavaThread::java_resume() {
2538 assert_locked_or_safepoint(Threads_lock);
2539
2540 // Sanity check: thread is gone, has started exiting or the thread
2541 // was not externally suspended.
2542 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) {
2543 return;
2544 }
2545
2546 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag);
2547
2548 clear_external_suspend();
2549
2550 if (is_ext_suspended()) {
2551 clear_ext_suspended();
2552 SR_lock()->notify_all();
2553 }
2554 }
2555
2556 void JavaThread::create_stack_guard_pages() {
2557 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return;
2558 address low_addr = stack_base() - stack_size();
2559 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size();
2560
2561 int allocate = os::allocate_stack_guard_pages();
2562 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len);
2563
2564 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) {
2565 warning("Attempt to allocate stack guard pages failed.");
2566 return;
2567 }
2568
2569 if (os::guard_memory((char *) low_addr, len)) {
2570 _stack_guard_state = stack_guard_enabled;
2571 } else {
2572 warning("Attempt to protect stack guard pages failed.");
2573 if (os::uncommit_memory((char *) low_addr, len)) {
2574 warning("Attempt to deallocate stack guard pages failed.");
2575 }
2576 }
2577 }
2578
2579 void JavaThread::remove_stack_guard_pages() {
2580 assert(Thread::current() == this, "from different thread");
2581 if (_stack_guard_state == stack_guard_unused) return;
2582 address low_addr = stack_base() - stack_size();
2583 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size();
2584
2585 if (os::allocate_stack_guard_pages()) {
2586 if (os::remove_stack_guard_pages((char *) low_addr, len)) {
2587 _stack_guard_state = stack_guard_unused;
2588 } else {
2589 warning("Attempt to deallocate stack guard pages failed.");
2590 }
2591 } else {
2592 if (_stack_guard_state == stack_guard_unused) return;
2593 if (os::unguard_memory((char *) low_addr, len)) {
2594 _stack_guard_state = stack_guard_unused;
2595 } else {
2596 warning("Attempt to unprotect stack guard pages failed.");
2597 }
2598 }
2599 }
2600
2601 void JavaThread::enable_stack_yellow_zone() {
2602 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages.");
2603 assert(_stack_guard_state != stack_guard_enabled, "already enabled");
2604
2605 // The base notation is from the stacks point of view, growing downward.
2606 // We need to adjust it to work correctly with guard_memory()
2607 address base = stack_yellow_zone_base() - stack_yellow_zone_size();
2608
2609 guarantee(base < stack_base(),"Error calculating stack yellow zone");
2610 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone");
2611
2612 if (os::guard_memory((char *) base, stack_yellow_zone_size())) {
2613 _stack_guard_state = stack_guard_enabled;
2614 } else {
2615 warning("Attempt to guard stack yellow zone failed.");
2616 }
2617 enable_register_stack_guard();
2618 }
2619
2620 void JavaThread::disable_stack_yellow_zone() {
2621 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages.");
2622 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled");
2623
2624 // Simply return if called for a thread that does not use guard pages.
2625 if (_stack_guard_state == stack_guard_unused) return;
2626
2627 // The base notation is from the stacks point of view, growing downward.
2628 // We need to adjust it to work correctly with guard_memory()
2629 address base = stack_yellow_zone_base() - stack_yellow_zone_size();
2630
2631 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) {
2632 _stack_guard_state = stack_guard_yellow_disabled;
2633 } else {
2634 warning("Attempt to unguard stack yellow zone failed.");
2635 }
2636 disable_register_stack_guard();
2637 }
2638
2639 void JavaThread::enable_stack_red_zone() {
2640 // The base notation is from the stacks point of view, growing downward.
2641 // We need to adjust it to work correctly with guard_memory()
2642 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages.");
2643 address base = stack_red_zone_base() - stack_red_zone_size();
2644
2645 guarantee(base < stack_base(),"Error calculating stack red zone");
2646 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone");
2647
2648 if(!os::guard_memory((char *) base, stack_red_zone_size())) {
2649 warning("Attempt to guard stack red zone failed.");
2650 }
2651 }
2652
2653 void JavaThread::disable_stack_red_zone() {
2654 // The base notation is from the stacks point of view, growing downward.
2655 // We need to adjust it to work correctly with guard_memory()
2656 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages.");
2657 address base = stack_red_zone_base() - stack_red_zone_size();
2658 if (!os::unguard_memory((char *)base, stack_red_zone_size())) {
2659 warning("Attempt to unguard stack red zone failed.");
2660 }
2661 }
2662
2663 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) {
2664 // ignore is there is no stack
2665 if (!has_last_Java_frame()) return;
2666 // traverse the stack frames. Starts from top frame.
2667 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) {
2668 frame* fr = fst.current();
2669 f(fr, fst.register_map());
2670 }
2671 }
2672
2673
2674 #ifndef PRODUCT
2675 // Deoptimization
2676 // Function for testing deoptimization
2677 void JavaThread::deoptimize() {
2678 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass
2679 StackFrameStream fst(this, UseBiasedLocking);
2680 bool deopt = false; // Dump stack only if a deopt actually happens.
2681 bool only_at = strlen(DeoptimizeOnlyAt) > 0;
2682 // Iterate over all frames in the thread and deoptimize
2683 for(; !fst.is_done(); fst.next()) {
2684 if(fst.current()->can_be_deoptimized()) {
2685
2686 if (only_at) {
2687 // Deoptimize only at particular bcis. DeoptimizeOnlyAt
2688 // consists of comma or carriage return separated numbers so
2689 // search for the current bci in that string.
2690 address pc = fst.current()->pc();
2691 nmethod* nm = (nmethod*) fst.current()->cb();
2692 ScopeDesc* sd = nm->scope_desc_at( pc);
2693 char buffer[8];
2694 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci());
2695 size_t len = strlen(buffer);
2696 const char * found = strstr(DeoptimizeOnlyAt, buffer);
2697 while (found != NULL) {
2698 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') &&
2699 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) {
2700 // Check that the bci found is bracketed by terminators.
2701 break;
2702 }
2703 found = strstr(found + 1, buffer);
2704 }
2705 if (!found) {
2706 continue;
2707 }
2708 }
2709
2710 if (DebugDeoptimization && !deopt) {
2711 deopt = true; // One-time only print before deopt
2712 tty->print_cr("[BEFORE Deoptimization]");
2713 trace_frames();
2714 trace_stack();
2715 }
2716 Deoptimization::deoptimize(this, *fst.current(), fst.register_map());
2717 }
2718 }
2719
2720 if (DebugDeoptimization && deopt) {
2721 tty->print_cr("[AFTER Deoptimization]");
2722 trace_frames();
2723 }
2724 }
2725
2726
2727 // Make zombies
2728 void JavaThread::make_zombies() {
2729 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) {
2730 if (fst.current()->can_be_deoptimized()) {
2731 // it is a Java nmethod
2732 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc());
2733 nm->make_not_entrant();
2734 }
2735 }
2736 }
2737 #endif // PRODUCT
2738
2739
2740 void JavaThread::deoptimized_wrt_marked_nmethods() {
2741 if (!has_last_Java_frame()) return;
2742 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass
2743 StackFrameStream fst(this, UseBiasedLocking);
2744 for(; !fst.is_done(); fst.next()) {
2745 if (fst.current()->should_be_deoptimized()) {
2746 if (LogCompilation && xtty != NULL) {
2747 nmethod* nm = fst.current()->cb()->as_nmethod_or_null();
2748 xtty->elem("deoptimized thread='" UINTX_FORMAT "' compile_id='%d'",
2749 this->name(), nm != NULL ? nm->compile_id() : -1);
2750 }
2751
2752 Deoptimization::deoptimize(this, *fst.current(), fst.register_map());
2753 }
2754 }
2755 }
2756
2757
2758 // GC support
2759 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); }
2760
2761 void JavaThread::gc_epilogue() {
2762 frames_do(frame_gc_epilogue);
2763 }
2764
2765
2766 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); }
2767
2768 void JavaThread::gc_prologue() {
2769 frames_do(frame_gc_prologue);
2770 }
2771
2772 // If the caller is a NamedThread, then remember, in the current scope,
2773 // the given JavaThread in its _processed_thread field.
2774 class RememberProcessedThread: public StackObj {
2775 NamedThread* _cur_thr;
2776 public:
2777 RememberProcessedThread(JavaThread* jthr) {
2778 Thread* thread = Thread::current();
2779 if (thread->is_Named_thread()) {
2780 _cur_thr = (NamedThread *)thread;
2781 _cur_thr->set_processed_thread(jthr);
2782 } else {
2783 _cur_thr = NULL;
2784 }
2785 }
2786
2787 ~RememberProcessedThread() {
2788 if (_cur_thr) {
2789 _cur_thr->set_processed_thread(NULL);
2790 }
2791 }
2792 };
2793
2794 void JavaThread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) {
2795 // Verify that the deferred card marks have been flushed.
2796 assert(deferred_card_mark().is_empty(), "Should be empty during GC");
2797
2798 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do
2799 // since there may be more than one thread using each ThreadProfiler.
2800
2801 // Traverse the GCHandles
2802 Thread::oops_do(f, cld_f, cf);
2803
2804 assert( (!has_last_Java_frame() && java_call_counter() == 0) ||
2805 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!");
2806
2807 if (has_last_Java_frame()) {
2808 // Record JavaThread to GC thread
2809 RememberProcessedThread rpt(this);
2810
2811 // Traverse the privileged stack
2812 if (_privileged_stack_top != NULL) {
2813 _privileged_stack_top->oops_do(f);
2814 }
2815
2816 // traverse the registered growable array
2817 if (_array_for_gc != NULL) {
2818 for (int index = 0; index < _array_for_gc->length(); index++) {
2819 f->do_oop(_array_for_gc->adr_at(index));
2820 }
2821 }
2822
2823 // Traverse the monitor chunks
2824 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) {
2825 chunk->oops_do(f);
2826 }
2827
2828 // Traverse the execution stack
2829 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) {
2830 fst.current()->oops_do(f, cld_f, cf, fst.register_map());
2831 }
2832 }
2833
2834 // callee_target is never live across a gc point so NULL it here should
2835 // it still contain a methdOop.
2836
2837 set_callee_target(NULL);
2838
2839 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!");
2840 // If we have deferred set_locals there might be oops waiting to be
2841 // written
2842 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals();
2843 if (list != NULL) {
2844 for (int i = 0; i < list->length(); i++) {
2845 list->at(i)->oops_do(f);
2846 }
2847 }
2848
2849 // Traverse instance variables at the end since the GC may be moving things
2850 // around using this function
2851 f->do_oop((oop*) &_threadObj);
2852 f->do_oop((oop*) &_vm_result);
2853 f->do_oop((oop*) &_exception_oop);
2854 f->do_oop((oop*) &_pending_async_exception);
2855
2856 if (jvmti_thread_state() != NULL) {
2857 jvmti_thread_state()->oops_do(f);
2858 }
2859
2860 if (_scanned_nmethod != NULL && cf != NULL) {
2861 // Safepoints can occur when the sweeper is scanning an nmethod so
2862 // process it here to make sure it isn't unloaded in the middle of
2863 // a scan.
2864 cf->do_code_blob(_scanned_nmethod);
2865 }
2866
2867 #ifdef GRAAL
2868 Hsail::HSAILDeoptimizationInfo* gpu_hsail_deopt_info = (Hsail::HSAILDeoptimizationInfo*) get_gpu_hsail_deopt_info();
2869 if (gpu_hsail_deopt_info != NULL) {
2870 gpu_hsail_deopt_info->oops_do(f);
2871 }
2872 #endif
2873 }
2874
2875 void JavaThread::nmethods_do(CodeBlobClosure* cf) {
2876 Thread::nmethods_do(cf); // (super method is a no-op)
2877
2878 assert( (!has_last_Java_frame() && java_call_counter() == 0) ||
2879 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!");
2880
2881 if (has_last_Java_frame()) {
2882 // Traverse the execution stack
2883 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) {
2884 fst.current()->nmethods_do(cf);
2885 }
2886 }
2887 }
2888
2889 void JavaThread::metadata_do(void f(Metadata*)) {
2890 Thread::metadata_do(f);
2891 if (has_last_Java_frame()) {
2892 // Traverse the execution stack to call f() on the methods in the stack
2893 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) {
2894 fst.current()->metadata_do(f);
2895 }
2896 } else if (is_Compiler_thread()) {
2897 // need to walk ciMetadata in current compile tasks to keep alive.
2898 CompilerThread* ct = (CompilerThread*)this;
2899 if (ct->env() != NULL) {
2900 ct->env()->metadata_do(f);
2901 }
2902 }
2903 }
2904
2905 // Printing
2906 const char* _get_thread_state_name(JavaThreadState _thread_state) {
2907 switch (_thread_state) {
2908 case _thread_uninitialized: return "_thread_uninitialized";
2909 case _thread_new: return "_thread_new";
2910 case _thread_new_trans: return "_thread_new_trans";
2911 case _thread_in_native: return "_thread_in_native";
2912 case _thread_in_native_trans: return "_thread_in_native_trans";
2913 case _thread_in_vm: return "_thread_in_vm";
2914 case _thread_in_vm_trans: return "_thread_in_vm_trans";
2915 case _thread_in_Java: return "_thread_in_Java";
2916 case _thread_in_Java_trans: return "_thread_in_Java_trans";
2917 case _thread_blocked: return "_thread_blocked";
2918 case _thread_blocked_trans: return "_thread_blocked_trans";
2919 default: return "unknown thread state";
2920 }
2921 }
2922
2923 #ifndef PRODUCT
2924 void JavaThread::print_thread_state_on(outputStream *st) const {
2925 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state));
2926 };
2927 void JavaThread::print_thread_state() const {
2928 print_thread_state_on(tty);
2929 };
2930 #endif // PRODUCT
2931
2932 // Called by Threads::print() for VM_PrintThreads operation
2933 void JavaThread::print_on(outputStream *st) const {
2934 st->print("\"%s\" ", get_thread_name());
2935 oop thread_oop = threadObj();
2936 if (thread_oop != NULL) {
2937 st->print("#" INT64_FORMAT " ", java_lang_Thread::thread_id(thread_oop));
2938 if (java_lang_Thread::is_daemon(thread_oop)) st->print("daemon ");
2939 st->print("prio=%d ", java_lang_Thread::priority(thread_oop));
2940 }
2941 Thread::print_on(st);
2942 // print guess for valid stack memory region (assume 4K pages); helps lock debugging
2943 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12));
2944 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) {
2945 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop));
2946 }
2947 #ifndef PRODUCT
2948 print_thread_state_on(st);
2949 _safepoint_state->print_on(st);
2950 #endif // PRODUCT
2951 }
2952
2953 // Called by fatal error handler. The difference between this and
2954 // JavaThread::print() is that we can't grab lock or allocate memory.
2955 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const {
2956 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen));
2957 oop thread_obj = threadObj();
2958 if (thread_obj != NULL) {
2959 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon");
2960 }
2961 st->print(" [");
2962 st->print("%s", _get_thread_state_name(_thread_state));
2963 if (osthread()) {
2964 st->print(", id=%d", osthread()->thread_id());
2965 }
2966 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")",
2967 _stack_base - _stack_size, _stack_base);
2968 st->print("]");
2969 return;
2970 }
2971
2972 // Verification
2973
2974 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); }
2975
2976 void JavaThread::verify() {
2977 // Verify oops in the thread.
2978 oops_do(&VerifyOopClosure::verify_oop, NULL, NULL);
2979
2980 // Verify the stack frames.
2981 frames_do(frame_verify);
2982 }
2983
2984 // CR 6300358 (sub-CR 2137150)
2985 // Most callers of this method assume that it can't return NULL but a
2986 // thread may not have a name whilst it is in the process of attaching to
2987 // the VM - see CR 6412693, and there are places where a JavaThread can be
2988 // seen prior to having it's threadObj set (eg JNI attaching threads and
2989 // if vm exit occurs during initialization). These cases can all be accounted
2990 // for such that this method never returns NULL.
2991 const char* JavaThread::get_thread_name() const {
2992 #ifdef ASSERT
2993 // early safepoints can hit while current thread does not yet have TLS
2994 if (!SafepointSynchronize::is_at_safepoint()) {
2995 Thread *cur = Thread::current();
2996 if (!(cur->is_Java_thread() && cur == this)) {
2997 // Current JavaThreads are allowed to get their own name without
2998 // the Threads_lock.
2999 assert_locked_or_safepoint(Threads_lock);
3000 }
3001 }
3002 #endif // ASSERT
3003 return get_thread_name_string();
3004 }
3005
3006 // Returns a non-NULL representation of this thread's name, or a suitable
3007 // descriptive string if there is no set name
3008 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const {
3009 const char* name_str;
3010 oop thread_obj = threadObj();
3011 if (thread_obj != NULL) {
3012 typeArrayOop name = java_lang_Thread::name(thread_obj);
3013 if (name != NULL) {
3014 if (buf == NULL) {
3015 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length());
3016 }
3017 else {
3018 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen);
3019 }
3020 }
3021 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306
3022 name_str = "<no-name - thread is attaching>";
3023 }
3024 else {
3025 name_str = Thread::name();
3026 }
3027 }
3028 else {
3029 name_str = Thread::name();
3030 }
3031 assert(name_str != NULL, "unexpected NULL thread name");
3032 return name_str;
3033 }
3034
3035
3036 const char* JavaThread::get_threadgroup_name() const {
3037 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);)
3038 oop thread_obj = threadObj();
3039 if (thread_obj != NULL) {
3040 oop thread_group = java_lang_Thread::threadGroup(thread_obj);
3041 if (thread_group != NULL) {
3042 typeArrayOop name = java_lang_ThreadGroup::name(thread_group);
3043 // ThreadGroup.name can be null
3044 if (name != NULL) {
3045 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length());
3046 return str;
3047 }
3048 }
3049 }
3050 return NULL;
3051 }
3052
3053 const char* JavaThread::get_parent_name() const {
3054 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);)
3055 oop thread_obj = threadObj();
3056 if (thread_obj != NULL) {
3057 oop thread_group = java_lang_Thread::threadGroup(thread_obj);
3058 if (thread_group != NULL) {
3059 oop parent = java_lang_ThreadGroup::parent(thread_group);
3060 if (parent != NULL) {
3061 typeArrayOop name = java_lang_ThreadGroup::name(parent);
3062 // ThreadGroup.name can be null
3063 if (name != NULL) {
3064 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length());
3065 return str;
3066 }
3067 }
3068 }
3069 }
3070 return NULL;
3071 }
3072
3073 ThreadPriority JavaThread::java_priority() const {
3074 oop thr_oop = threadObj();
3075 if (thr_oop == NULL) return NormPriority; // Bootstrapping
3076 ThreadPriority priority = java_lang_Thread::priority(thr_oop);
3077 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check");
3078 return priority;
3079 }
3080
3081 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) {
3082
3083 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
3084 // Link Java Thread object <-> C++ Thread
3085
3086 // Get the C++ thread object (an oop) from the JNI handle (a jthread)
3087 // and put it into a new Handle. The Handle "thread_oop" can then
3088 // be used to pass the C++ thread object to other methods.
3089
3090 // Set the Java level thread object (jthread) field of the
3091 // new thread (a JavaThread *) to C++ thread object using the
3092 // "thread_oop" handle.
3093
3094 // Set the thread field (a JavaThread *) of the
3095 // oop representing the java_lang_Thread to the new thread (a JavaThread *).
3096
3097 Handle thread_oop(Thread::current(),
3098 JNIHandles::resolve_non_null(jni_thread));
3099 assert(InstanceKlass::cast(thread_oop->klass())->is_linked(),
3100 "must be initialized");
3101 set_threadObj(thread_oop());
3102 java_lang_Thread::set_thread(thread_oop(), this);
3103
3104 if (prio == NoPriority) {
3105 prio = java_lang_Thread::priority(thread_oop());
3106 assert(prio != NoPriority, "A valid priority should be present");
3107 }
3108
3109 // Push the Java priority down to the native thread; needs Threads_lock
3110 Thread::set_priority(this, prio);
3111
3112 // Add the new thread to the Threads list and set it in motion.
3113 // We must have threads lock in order to call Threads::add.
3114 // It is crucial that we do not block before the thread is
3115 // added to the Threads list for if a GC happens, then the java_thread oop
3116 // will not be visited by GC.
3117 Threads::add(this);
3118 }
3119
3120 oop JavaThread::current_park_blocker() {
3121 // Support for JSR-166 locks
3122 oop thread_oop = threadObj();
3123 if (thread_oop != NULL &&
3124 JDK_Version::current().supports_thread_park_blocker()) {
3125 return java_lang_Thread::park_blocker(thread_oop);
3126 }
3127 return NULL;
3128 }
3129
3130
3131 void JavaThread::print_stack_on(outputStream* st) {
3132 if (!has_last_Java_frame()) return;
3133 ResourceMark rm;
3134 HandleMark hm;
3135
3136 RegisterMap reg_map(this);
3137 vframe* start_vf = last_java_vframe(®_map);
3138 int count = 0;
3139 for (vframe* f = start_vf; f; f = f->sender() ) {
3140 if (f->is_java_frame()) {
3141 javaVFrame* jvf = javaVFrame::cast(f);
3142 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci());
3143
3144 // Print out lock information
3145 if (JavaMonitorsInStackTrace) {
3146 jvf->print_lock_info_on(st, count);
3147 }
3148 } else {
3149 // Ignore non-Java frames
3150 }
3151
3152 // Bail-out case for too deep stacks
3153 count++;
3154 if (MaxJavaStackTraceDepth == count) return;
3155 }
3156 }
3157
3158
3159 // JVMTI PopFrame support
3160 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) {
3161 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments");
3162 if (in_bytes(size_in_bytes) != 0) {
3163 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes), mtThread);
3164 _popframe_preserved_args_size = in_bytes(size_in_bytes);
3165 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size);
3166 }
3167 }
3168
3169 void* JavaThread::popframe_preserved_args() {
3170 return _popframe_preserved_args;
3171 }
3172
3173 ByteSize JavaThread::popframe_preserved_args_size() {
3174 return in_ByteSize(_popframe_preserved_args_size);
3175 }
3176
3177 WordSize JavaThread::popframe_preserved_args_size_in_words() {
3178 int sz = in_bytes(popframe_preserved_args_size());
3179 assert(sz % wordSize == 0, "argument size must be multiple of wordSize");
3180 return in_WordSize(sz / wordSize);
3181 }
3182
3183 void JavaThread::popframe_free_preserved_args() {
3184 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice");
3185 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args, mtThread);
3186 _popframe_preserved_args = NULL;
3187 _popframe_preserved_args_size = 0;
3188 }
3189
3190 #ifndef PRODUCT
3191
3192 void JavaThread::trace_frames() {
3193 tty->print_cr("[Describe stack]");
3194 int frame_no = 1;
3195 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) {
3196 tty->print(" %d. ", frame_no++);
3197 fst.current()->print_value_on(tty,this);
3198 tty->cr();
3199 }
3200 }
3201
3202 class PrintAndVerifyOopClosure: public OopClosure {
3203 protected:
3204 template <class T> inline void do_oop_work(T* p) {
3205 oop obj = oopDesc::load_decode_heap_oop(p);
3206 if (obj == NULL) return;
3207 tty->print(INTPTR_FORMAT ": ", p);
3208 if (obj->is_oop_or_null()) {
3209 if (obj->is_objArray()) {
3210 tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj);
3211 } else {
3212 obj->print();
3213 }
3214 } else {
3215 tty->print_cr("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj);
3216 }
3217 tty->cr();
3218 }
3219 public:
3220 virtual void do_oop(oop* p) { do_oop_work(p); }
3221 virtual void do_oop(narrowOop* p) { do_oop_work(p); }
3222 };
3223
3224
3225 static void oops_print(frame* f, const RegisterMap *map) {
3226 PrintAndVerifyOopClosure print;
3227 f->print_value();
3228 f->oops_do(&print, NULL, NULL, (RegisterMap*)map);
3229 }
3230
3231 // Print our all the locations that contain oops and whether they are
3232 // valid or not. This useful when trying to find the oldest frame
3233 // where an oop has gone bad since the frame walk is from youngest to
3234 // oldest.
3235 void JavaThread::trace_oops() {
3236 tty->print_cr("[Trace oops]");
3237 frames_do(oops_print);
3238 }
3239
3240
3241 #ifdef ASSERT
3242 // Print or validate the layout of stack frames
3243 void JavaThread::print_frame_layout(int depth, bool validate_only) {
3244 ResourceMark rm;
3245 PRESERVE_EXCEPTION_MARK;
3246 FrameValues values;
3247 int frame_no = 0;
3248 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) {
3249 fst.current()->describe(values, ++frame_no);
3250 if (depth == frame_no) break;
3251 }
3252 if (validate_only) {
3253 values.validate();
3254 } else {
3255 tty->print_cr("[Describe stack layout]");
3256 values.print(this);
3257 }
3258 }
3259 #endif
3260
3261 void JavaThread::trace_stack_from(vframe* start_vf) {
3262 ResourceMark rm;
3263 int vframe_no = 1;
3264 for (vframe* f = start_vf; f; f = f->sender() ) {
3265 if (f->is_java_frame()) {
3266 javaVFrame::cast(f)->print_activation(vframe_no++);
3267 } else {
3268 f->print();
3269 }
3270 if (vframe_no > StackPrintLimit) {
3271 tty->print_cr("...<more frames>...");
3272 return;
3273 }
3274 }
3275 }
3276
3277
3278 void JavaThread::trace_stack() {
3279 if (!has_last_Java_frame()) return;
3280 ResourceMark rm;
3281 HandleMark hm;
3282 RegisterMap reg_map(this);
3283 trace_stack_from(last_java_vframe(®_map));
3284 }
3285
3286
3287 #endif // PRODUCT
3288
3289
3290 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) {
3291 assert(reg_map != NULL, "a map must be given");
3292 frame f = last_frame();
3293 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) {
3294 if (vf->is_java_frame()) return javaVFrame::cast(vf);
3295 }
3296 return NULL;
3297 }
3298
3299
3300 Klass* JavaThread::security_get_caller_class(int depth) {
3301 vframeStream vfst(this);
3302 vfst.security_get_caller_frame(depth);
3303 if (!vfst.at_end()) {
3304 return vfst.method()->method_holder();
3305 }
3306 return NULL;
3307 }
3308
3309 static void compiler_thread_entry(JavaThread* thread, TRAPS) {
3310 assert(thread->is_Compiler_thread(), "must be compiler thread");
3311 CompileBroker::compiler_thread_loop();
3312 }
3313
3314 // Create a CompilerThread
3315 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters)
3316 : JavaThread(&compiler_thread_entry) {
3317 _env = NULL;
3318 _log = NULL;
3319 _task = NULL;
3320 _queue = queue;
3321 _counters = counters;
3322 _buffer_blob = NULL;
3323 _scanned_nmethod = NULL;
3324 _compiler = NULL;
3325
3326 #ifndef PRODUCT
3327 _ideal_graph_printer = NULL;
3328 #endif
3329 }
3330
3331 #ifdef COMPILERGRAAL
3332 bool CompilerThread::can_call_java() const {
3333 return _compiler != NULL && _compiler->is_graal();
3334 }
3335 #endif
3336
3337 void CompilerThread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) {
3338 JavaThread::oops_do(f, cld_f, cf);
3339 if (_scanned_nmethod != NULL && cf != NULL) {
3340 // Safepoints can occur when the sweeper is scanning an nmethod so
3341 // process it here to make sure it isn't unloaded in the middle of
3342 // a scan.
3343 cf->do_code_blob(_scanned_nmethod);
3344 }
3345 }
3346
3347
3348 // ======= Threads ========
3349
3350 // The Threads class links together all active threads, and provides
3351 // operations over all threads. It is protected by its own Mutex
3352 // lock, which is also used in other contexts to protect thread
3353 // operations from having the thread being operated on from exiting
3354 // and going away unexpectedly (e.g., safepoint synchronization)
3355
3356 JavaThread* Threads::_thread_list = NULL;
3357 int Threads::_number_of_threads = 0;
3358 int Threads::_number_of_non_daemon_threads = 0;
3359 int Threads::_return_code = 0;
3360 size_t JavaThread::_stack_size_at_create = 0;
3361 #ifdef ASSERT
3362 bool Threads::_vm_complete = false;
3363 #endif
3364
3365 // All JavaThreads
3366 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next())
3367
3368 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system)
3369 void Threads::threads_do(ThreadClosure* tc) {
3370 assert_locked_or_safepoint(Threads_lock);
3371 // ALL_JAVA_THREADS iterates through all JavaThreads
3372 ALL_JAVA_THREADS(p) {
3373 tc->do_thread(p);
3374 }
3375 // Someday we could have a table or list of all non-JavaThreads.
3376 // For now, just manually iterate through them.
3377 tc->do_thread(VMThread::vm_thread());
3378 Universe::heap()->gc_threads_do(tc);
3379 WatcherThread *wt = WatcherThread::watcher_thread();
3380 // Strictly speaking, the following NULL check isn't sufficient to make sure
3381 // the data for WatcherThread is still valid upon being examined. However,
3382 // considering that WatchThread terminates when the VM is on the way to
3383 // exit at safepoint, the chance of the above is extremely small. The right
3384 // way to prevent termination of WatcherThread would be to acquire
3385 // Terminator_lock, but we can't do that without violating the lock rank
3386 // checking in some cases.
3387 if (wt != NULL)
3388 tc->do_thread(wt);
3389
3390 // If CompilerThreads ever become non-JavaThreads, add them here
3391 }
3392
3393 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) {
3394
3395 extern void JDK_Version_init();
3396
3397 // Check version
3398 if (!is_supported_jni_version(args->version)) return JNI_EVERSION;
3399
3400 // Initialize the output stream module
3401 ostream_init();
3402
3403 // Process java launcher properties.
3404 Arguments::process_sun_java_launcher_properties(args);
3405
3406 // Initialize the os module before using TLS
3407 os::init();
3408
3409 // Initialize system properties.
3410 Arguments::init_system_properties();
3411
3412 // So that JDK version can be used as a discrimintor when parsing arguments
3413 JDK_Version_init();
3414
3415 // Update/Initialize System properties after JDK version number is known
3416 Arguments::init_version_specific_system_properties();
3417
3418 // Parse arguments
3419 jint parse_result = Arguments::parse(args);
3420 if (parse_result != JNI_OK) return parse_result;
3421
3422 os::init_before_ergo();
3423
3424 jint ergo_result = Arguments::apply_ergo();
3425 if (ergo_result != JNI_OK) return ergo_result;
3426
3427 if (PauseAtStartup) {
3428 os::pause();
3429 }
3430
3431 #ifndef USDT2
3432 HS_DTRACE_PROBE(hotspot, vm__init__begin);
3433 #else /* USDT2 */
3434 HOTSPOT_VM_INIT_BEGIN();
3435 #endif /* USDT2 */
3436
3437 // Record VM creation timing statistics
3438 TraceVmCreationTime create_vm_timer;
3439 create_vm_timer.start();
3440
3441 // Timing (must come after argument parsing)
3442 TraceTime timer("Create VM", TraceStartupTime);
3443
3444 // Initialize the os module after parsing the args
3445 jint os_init_2_result = os::init_2();
3446 if (os_init_2_result != JNI_OK) return os_init_2_result;
3447
3448 jint adjust_after_os_result = Arguments::adjust_after_os();
3449 if (adjust_after_os_result != JNI_OK) return adjust_after_os_result;
3450
3451 // intialize TLS
3452 ThreadLocalStorage::init();
3453
3454 // Bootstrap native memory tracking, so it can start recording memory
3455 // activities before worker thread is started. This is the first phase
3456 // of bootstrapping, VM is currently running in single-thread mode.
3457 MemTracker::bootstrap_single_thread();
3458
3459 // Initialize output stream logging
3460 ostream_init_log();
3461
3462 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad
3463 // Must be before create_vm_init_agents()
3464 if (Arguments::init_libraries_at_startup()) {
3465 convert_vm_init_libraries_to_agents();
3466 }
3467
3468 // Launch -agentlib/-agentpath and converted -Xrun agents
3469 if (Arguments::init_agents_at_startup()) {
3470 create_vm_init_agents();
3471 }
3472
3473 // Initialize Threads state
3474 _thread_list = NULL;
3475 _number_of_threads = 0;
3476 _number_of_non_daemon_threads = 0;
3477
3478 // Initialize global data structures and create system classes in heap
3479 vm_init_globals();
3480
3481 #ifdef GRAAL
3482 if (GraalCounterSize > 0) {
3483 JavaThread::_graal_old_thread_counters = NEW_C_HEAP_ARRAY(jlong, GraalCounterSize, mtInternal);
3484 memset(JavaThread::_graal_old_thread_counters, 0, sizeof(jlong) * GraalCounterSize);
3485 } else {
3486 JavaThread::_graal_old_thread_counters = NULL;
3487 }
3488 #endif // GRAAL
3489
3490 // Attach the main thread to this os thread
3491 JavaThread* main_thread = new JavaThread();
3492 main_thread->set_thread_state(_thread_in_vm);
3493 // must do this before set_active_handles and initialize_thread_local_storage
3494 // Note: on solaris initialize_thread_local_storage() will (indirectly)
3495 // change the stack size recorded here to one based on the java thread
3496 // stacksize. This adjusted size is what is used to figure the placement
3497 // of the guard pages.
3498 main_thread->record_stack_base_and_size();
3499 main_thread->initialize_thread_local_storage();
3500
3501 main_thread->set_active_handles(JNIHandleBlock::allocate_block());
3502
3503 if (!main_thread->set_as_starting_thread()) {
3504 vm_shutdown_during_initialization(
3505 "Failed necessary internal allocation. Out of swap space");
3506 delete main_thread;
3507 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again
3508 return JNI_ENOMEM;
3509 }
3510
3511 // Enable guard page *after* os::create_main_thread(), otherwise it would
3512 // crash Linux VM, see notes in os_linux.cpp.
3513 main_thread->create_stack_guard_pages();
3514
3515 // Initialize Java-Level synchronization subsystem
3516 ObjectMonitor::Initialize() ;
3517
3518 // Second phase of bootstrapping, VM is about entering multi-thread mode
3519 MemTracker::bootstrap_multi_thread();
3520
3521 // Initialize global modules
3522 jint status = init_globals();
3523 if (status != JNI_OK) {
3524 delete main_thread;
3525 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again
3526 return status;
3527 }
3528
3529 // Should be done after the heap is fully created
3530 main_thread->cache_global_variables();
3531
3532 HandleMark hm;
3533
3534 { MutexLocker mu(Threads_lock);
3535 Threads::add(main_thread);
3536 }
3537
3538 // Any JVMTI raw monitors entered in onload will transition into
3539 // real raw monitor. VM is setup enough here for raw monitor enter.
3540 JvmtiExport::transition_pending_onload_raw_monitors();
3541
3542 // Fully start NMT
3543 MemTracker::start();
3544
3545 // Create the VMThread
3546 { TraceTime timer("Start VMThread", TraceStartupTime);
3547 VMThread::create();
3548 Thread* vmthread = VMThread::vm_thread();
3549
3550 if (!os::create_thread(vmthread, os::vm_thread))
3551 vm_exit_during_initialization("Cannot create VM thread. Out of system resources.");
3552
3553 // Wait for the VM thread to become ready, and VMThread::run to initialize
3554 // Monitors can have spurious returns, must always check another state flag
3555 {
3556 MutexLocker ml(Notify_lock);
3557 os::start_thread(vmthread);
3558 while (vmthread->active_handles() == NULL) {
3559 Notify_lock->wait();
3560 }
3561 }
3562 }
3563
3564 assert (Universe::is_fully_initialized(), "not initialized");
3565 if (VerifyDuringStartup) {
3566 // Make sure we're starting with a clean slate.
3567 VM_Verify verify_op;
3568 VMThread::execute(&verify_op);
3569 }
3570
3571 EXCEPTION_MARK;
3572
3573 // At this point, the Universe is initialized, but we have not executed
3574 // any byte code. Now is a good time (the only time) to dump out the
3575 // internal state of the JVM for sharing.
3576 if (DumpSharedSpaces) {
3577 MetaspaceShared::preload_and_dump(CHECK_0);
3578 ShouldNotReachHere();
3579 }
3580
3581 // Always call even when there are not JVMTI environments yet, since environments
3582 // may be attached late and JVMTI must track phases of VM execution
3583 JvmtiExport::enter_start_phase();
3584
3585 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents.
3586 JvmtiExport::post_vm_start();
3587
3588 {
3589 TraceTime timer("Initialize java.lang classes", TraceStartupTime);
3590
3591 if (EagerXrunInit && Arguments::init_libraries_at_startup()) {
3592 create_vm_init_libraries();
3593 }
3594
3595 initialize_class(vmSymbols::java_lang_String(), CHECK_0);
3596
3597 // Initialize java_lang.System (needed before creating the thread)
3598 initialize_class(vmSymbols::java_lang_System(), CHECK_0);
3599 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0);
3600 Handle thread_group = create_initial_thread_group(CHECK_0);
3601 Universe::set_main_thread_group(thread_group());
3602 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0);
3603 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0);
3604 main_thread->set_threadObj(thread_object);
3605 // Set thread status to running since main thread has
3606 // been started and running.
3607 java_lang_Thread::set_thread_status(thread_object,
3608 java_lang_Thread::RUNNABLE);
3609
3610 // The VM creates & returns objects of this class. Make sure it's initialized.
3611 initialize_class(vmSymbols::java_lang_Class(), CHECK_0);
3612
3613 // The VM preresolves methods to these classes. Make sure that they get initialized
3614 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0);
3615 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0);
3616 call_initializeSystemClass(CHECK_0);
3617
3618 // get the Java runtime name after java.lang.System is initialized
3619 JDK_Version::set_runtime_name(get_java_runtime_name(THREAD));
3620 JDK_Version::set_runtime_version(get_java_runtime_version(THREAD));
3621
3622 // an instance of OutOfMemory exception has been allocated earlier
3623 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0);
3624 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0);
3625 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0);
3626 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0);
3627 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0);
3628 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0);
3629 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0);
3630 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK_0);
3631 }
3632
3633 // See : bugid 4211085.
3634 // Background : the static initializer of java.lang.Compiler tries to read
3635 // property"java.compiler" and read & write property "java.vm.info".
3636 // When a security manager is installed through the command line
3637 // option "-Djava.security.manager", the above properties are not
3638 // readable and the static initializer for java.lang.Compiler fails
3639 // resulting in a NoClassDefFoundError. This can happen in any
3640 // user code which calls methods in java.lang.Compiler.
3641 // Hack : the hack is to pre-load and initialize this class, so that only
3642 // system domains are on the stack when the properties are read.
3643 // Currently even the AWT code has calls to methods in java.lang.Compiler.
3644 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT.
3645 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and
3646 // read and write"java.vm.info" in the default policy file. See bugid 4211383
3647 // Once that is done, we should remove this hack.
3648 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0);
3649
3650 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to
3651 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot
3652 // compiler does not get loaded through java.lang.Compiler). "java -version" with the
3653 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here.
3654 // This should also be taken out as soon as 4211383 gets fixed.
3655 reset_vm_info_property(CHECK_0);
3656
3657 quicken_jni_functions();
3658
3659 // Must be run after init_ft which initializes ft_enabled
3660 if (TRACE_INITIALIZE() != JNI_OK) {
3661 vm_exit_during_initialization("Failed to initialize tracing backend");
3662 }
3663
3664 // Set flag that basic initialization has completed. Used by exceptions and various
3665 // debug stuff, that does not work until all basic classes have been initialized.
3666 set_init_completed();
3667
3668 #ifndef USDT2
3669 HS_DTRACE_PROBE(hotspot, vm__init__end);
3670 #else /* USDT2 */
3671 HOTSPOT_VM_INIT_END();
3672 #endif /* USDT2 */
3673
3674 // record VM initialization completion time
3675 #if INCLUDE_MANAGEMENT
3676 Management::record_vm_init_completed();
3677 #endif // INCLUDE_MANAGEMENT
3678
3679 // Compute system loader. Note that this has to occur after set_init_completed, since
3680 // valid exceptions may be thrown in the process.
3681 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and
3682 // set_init_completed has just been called, causing exceptions not to be shortcut
3683 // anymore. We call vm_exit_during_initialization directly instead.
3684 SystemDictionary::compute_java_system_loader(THREAD);
3685 #ifdef GRAAL
3686 if (!HAS_PENDING_EXCEPTION) {
3687 SystemDictionary::initialize_preloaded_graal_classes(THREAD);
3688 }
3689 #endif
3690 if (HAS_PENDING_EXCEPTION) {
3691 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION));
3692 }
3693
3694 #if INCLUDE_ALL_GCS
3695 // Support for ConcurrentMarkSweep. This should be cleaned up
3696 // and better encapsulated. The ugly nested if test would go away
3697 // once things are properly refactored. XXX YSR
3698 if (UseConcMarkSweepGC || UseG1GC) {
3699 if (UseConcMarkSweepGC) {
3700 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD);
3701 } else {
3702 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD);
3703 }
3704 if (HAS_PENDING_EXCEPTION) {
3705 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION));
3706 }
3707 }
3708 #endif // INCLUDE_ALL_GCS
3709
3710 // Always call even when there are not JVMTI environments yet, since environments
3711 // may be attached late and JVMTI must track phases of VM execution
3712 JvmtiExport::enter_live_phase();
3713
3714 // Signal Dispatcher needs to be started before VMInit event is posted
3715 os::signal_init();
3716
3717 // Start Attach Listener if +StartAttachListener or it can't be started lazily
3718 if (!DisableAttachMechanism) {
3719 AttachListener::vm_start();
3720 if (StartAttachListener || AttachListener::init_at_startup()) {
3721 AttachListener::init();
3722 }
3723 }
3724
3725 // Launch -Xrun agents
3726 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP
3727 // back-end can launch with -Xdebug -Xrunjdwp.
3728 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) {
3729 create_vm_init_libraries();
3730 }
3731
3732 // Notify JVMTI agents that VM initialization is complete - nop if no agents.
3733 JvmtiExport::post_vm_initialized();
3734
3735 if (TRACE_START() != JNI_OK) {
3736 vm_exit_during_initialization("Failed to start tracing backend.");
3737 }
3738
3739 if (CleanChunkPoolAsync) {
3740 Chunk::start_chunk_pool_cleaner_task();
3741 }
3742
3743 #ifdef GRAAL
3744 status = GraalRuntime::check_arguments(main_thread);
3745 if (status != JNI_OK) {
3746 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again
3747 return status;
3748 }
3749 #endif
3750
3751 // initialize compiler(s)
3752 #if defined(COMPILER1) || defined(COMPILER2) || defined(SHARK) || defined(COMPILERGRAAL)
3753 CompileBroker::compilation_init();
3754 #endif
3755
3756 if (EnableInvokeDynamic) {
3757 // Pre-initialize some JSR292 core classes to avoid deadlock during class loading.
3758 // It is done after compilers are initialized, because otherwise compilations of
3759 // signature polymorphic MH intrinsics can be missed
3760 // (see SystemDictionary::find_method_handle_intrinsic).
3761 initialize_class(vmSymbols::java_lang_invoke_MethodHandle(), CHECK_0);
3762 initialize_class(vmSymbols::java_lang_invoke_MemberName(), CHECK_0);
3763 initialize_class(vmSymbols::java_lang_invoke_MethodHandleNatives(), CHECK_0);
3764 }
3765
3766 #if INCLUDE_MANAGEMENT
3767 Management::initialize(THREAD);
3768 #endif // INCLUDE_MANAGEMENT
3769
3770 if (HAS_PENDING_EXCEPTION) {
3771 // management agent fails to start possibly due to
3772 // configuration problem and is responsible for printing
3773 // stack trace if appropriate. Simply exit VM.
3774 vm_exit(1);
3775 }
3776
3777 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true);
3778 if (MemProfiling) MemProfiler::engage();
3779 StatSampler::engage();
3780 if (CheckJNICalls) JniPeriodicChecker::engage();
3781
3782 BiasedLocking::init();
3783
3784 if (JDK_Version::current().post_vm_init_hook_enabled()) {
3785 call_postVMInitHook(THREAD);
3786 // The Java side of PostVMInitHook.run must deal with all
3787 // exceptions and provide means of diagnosis.
3788 if (HAS_PENDING_EXCEPTION) {
3789 CLEAR_PENDING_EXCEPTION;
3790 }
3791 }
3792
3793 {
3794 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag);
3795 // Make sure the watcher thread can be started by WatcherThread::start()
3796 // or by dynamic enrollment.
3797 WatcherThread::make_startable();
3798 // Start up the WatcherThread if there are any periodic tasks
3799 // NOTE: All PeriodicTasks should be registered by now. If they
3800 // aren't, late joiners might appear to start slowly (we might
3801 // take a while to process their first tick).
3802 if (PeriodicTask::num_tasks() > 0) {
3803 WatcherThread::start();
3804 }
3805 }
3806
3807 // Give os specific code one last chance to start
3808 os::init_3();
3809
3810 create_vm_timer.end();
3811 #ifdef ASSERT
3812 _vm_complete = true;
3813 #endif
3814 return JNI_OK;
3815 }
3816
3817 // type for the Agent_OnLoad and JVM_OnLoad entry points
3818 extern "C" {
3819 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *);
3820 }
3821 // Find a command line agent library and return its entry point for
3822 // -agentlib: -agentpath: -Xrun
3823 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array.
3824 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) {
3825 OnLoadEntry_t on_load_entry = NULL;
3826 void *library = NULL;
3827
3828 if (!agent->valid()) {
3829 char buffer[JVM_MAXPATHLEN];
3830 char ebuf[1024];
3831 const char *name = agent->name();
3832 const char *msg = "Could not find agent library ";
3833
3834 // First check to see if agent is statically linked into executable
3835 if (os::find_builtin_agent(agent, on_load_symbols, num_symbol_entries)) {
3836 library = agent->os_lib();
3837 } else if (agent->is_absolute_path()) {
3838 library = os::dll_load(name, ebuf, sizeof ebuf);
3839 if (library == NULL) {
3840 const char *sub_msg = " in absolute path, with error: ";
3841 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1;
3842 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread);
3843 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf);
3844 // If we can't find the agent, exit.
3845 vm_exit_during_initialization(buf, NULL);
3846 FREE_C_HEAP_ARRAY(char, buf, mtThread);
3847 }
3848 } else {
3849 // Try to load the agent from the standard dll directory
3850 if (os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(),
3851 name)) {
3852 library = os::dll_load(buffer, ebuf, sizeof ebuf);
3853 }
3854 if (library == NULL) { // Try the local directory
3855 char ns[1] = {0};
3856 if (os::dll_build_name(buffer, sizeof(buffer), ns, name)) {
3857 library = os::dll_load(buffer, ebuf, sizeof ebuf);
3858 }
3859 if (library == NULL) {
3860 const char *sub_msg = " on the library path, with error: ";
3861 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1;
3862 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread);
3863 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf);
3864 // If we can't find the agent, exit.
3865 vm_exit_during_initialization(buf, NULL);
3866 FREE_C_HEAP_ARRAY(char, buf, mtThread);
3867 }
3868 }
3869 }
3870 agent->set_os_lib(library);
3871 agent->set_valid();
3872 }
3873
3874 // Find the OnLoad function.
3875 on_load_entry =
3876 CAST_TO_FN_PTR(OnLoadEntry_t, os::find_agent_function(agent,
3877 false,
3878 on_load_symbols,
3879 num_symbol_entries));
3880 return on_load_entry;
3881 }
3882
3883 // Find the JVM_OnLoad entry point
3884 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) {
3885 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS;
3886 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*));
3887 }
3888
3889 // Find the Agent_OnLoad entry point
3890 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) {
3891 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS;
3892 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*));
3893 }
3894
3895 // For backwards compatibility with -Xrun
3896 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be
3897 // treated like -agentpath:
3898 // Must be called before agent libraries are created
3899 void Threads::convert_vm_init_libraries_to_agents() {
3900 AgentLibrary* agent;
3901 AgentLibrary* next;
3902
3903 for (agent = Arguments::libraries(); agent != NULL; agent = next) {
3904 next = agent->next(); // cache the next agent now as this agent may get moved off this list
3905 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent);
3906
3907 // If there is an JVM_OnLoad function it will get called later,
3908 // otherwise see if there is an Agent_OnLoad
3909 if (on_load_entry == NULL) {
3910 on_load_entry = lookup_agent_on_load(agent);
3911 if (on_load_entry != NULL) {
3912 // switch it to the agent list -- so that Agent_OnLoad will be called,
3913 // JVM_OnLoad won't be attempted and Agent_OnUnload will
3914 Arguments::convert_library_to_agent(agent);
3915 } else {
3916 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name());
3917 }
3918 }
3919 }
3920 }
3921
3922 // Create agents for -agentlib: -agentpath: and converted -Xrun
3923 // Invokes Agent_OnLoad
3924 // Called very early -- before JavaThreads exist
3925 void Threads::create_vm_init_agents() {
3926 extern struct JavaVM_ main_vm;
3927 AgentLibrary* agent;
3928
3929 JvmtiExport::enter_onload_phase();
3930
3931 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) {
3932 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent);
3933
3934 if (on_load_entry != NULL) {
3935 // Invoke the Agent_OnLoad function
3936 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL);
3937 if (err != JNI_OK) {
3938 vm_exit_during_initialization("agent library failed to init", agent->name());
3939 }
3940 } else {
3941 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name());
3942 }
3943 }
3944 JvmtiExport::enter_primordial_phase();
3945 }
3946
3947 extern "C" {
3948 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *);
3949 }
3950
3951 void Threads::shutdown_vm_agents() {
3952 // Send any Agent_OnUnload notifications
3953 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS;
3954 size_t num_symbol_entries = ARRAY_SIZE(on_unload_symbols);
3955 extern struct JavaVM_ main_vm;
3956 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) {
3957
3958 // Find the Agent_OnUnload function.
3959 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t,
3960 os::find_agent_function(agent,
3961 false,
3962 on_unload_symbols,
3963 num_symbol_entries));
3964
3965 // Invoke the Agent_OnUnload function
3966 if (unload_entry != NULL) {
3967 JavaThread* thread = JavaThread::current();
3968 ThreadToNativeFromVM ttn(thread);
3969 HandleMark hm(thread);
3970 (*unload_entry)(&main_vm);
3971 }
3972 }
3973 }
3974
3975 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries
3976 // Invokes JVM_OnLoad
3977 void Threads::create_vm_init_libraries() {
3978 extern struct JavaVM_ main_vm;
3979 AgentLibrary* agent;
3980
3981 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) {
3982 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent);
3983
3984 if (on_load_entry != NULL) {
3985 // Invoke the JVM_OnLoad function
3986 JavaThread* thread = JavaThread::current();
3987 ThreadToNativeFromVM ttn(thread);
3988 HandleMark hm(thread);
3989 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL);
3990 if (err != JNI_OK) {
3991 vm_exit_during_initialization("-Xrun library failed to init", agent->name());
3992 }
3993 } else {
3994 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name());
3995 }
3996 }
3997 }
3998
3999 // Last thread running calls java.lang.Shutdown.shutdown()
4000 void JavaThread::invoke_shutdown_hooks() {
4001 HandleMark hm(this);
4002
4003 // We could get here with a pending exception, if so clear it now.
4004 if (this->has_pending_exception()) {
4005 this->clear_pending_exception();
4006 }
4007
4008 EXCEPTION_MARK;
4009 Klass* k =
4010 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(),
4011 THREAD);
4012 if (k != NULL) {
4013 // SystemDictionary::resolve_or_null will return null if there was
4014 // an exception. If we cannot load the Shutdown class, just don't
4015 // call Shutdown.shutdown() at all. This will mean the shutdown hooks
4016 // and finalizers (if runFinalizersOnExit is set) won't be run.
4017 // Note that if a shutdown hook was registered or runFinalizersOnExit
4018 // was called, the Shutdown class would have already been loaded
4019 // (Runtime.addShutdownHook and runFinalizersOnExit will load it).
4020 instanceKlassHandle shutdown_klass (THREAD, k);
4021 JavaValue result(T_VOID);
4022 JavaCalls::call_static(&result,
4023 shutdown_klass,
4024 vmSymbols::shutdown_method_name(),
4025 vmSymbols::void_method_signature(),
4026 THREAD);
4027 }
4028 CLEAR_PENDING_EXCEPTION;
4029 }
4030
4031 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when
4032 // the program falls off the end of main(). Another VM exit path is through
4033 // vm_exit() when the program calls System.exit() to return a value or when
4034 // there is a serious error in VM. The two shutdown paths are not exactly
4035 // the same, but they share Shutdown.shutdown() at Java level and before_exit()
4036 // and VM_Exit op at VM level.
4037 //
4038 // Shutdown sequence:
4039 // + Shutdown native memory tracking if it is on
4040 // + Wait until we are the last non-daemon thread to execute
4041 // <-- every thing is still working at this moment -->
4042 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level
4043 // shutdown hooks, run finalizers if finalization-on-exit
4044 // + Call before_exit(), prepare for VM exit
4045 // > run VM level shutdown hooks (they are registered through JVM_OnExit(),
4046 // currently the only user of this mechanism is File.deleteOnExit())
4047 // > stop flat profiler, StatSampler, watcher thread, CMS threads,
4048 // post thread end and vm death events to JVMTI,
4049 // stop signal thread
4050 // + Call JavaThread::exit(), it will:
4051 // > release JNI handle blocks, remove stack guard pages
4052 // > remove this thread from Threads list
4053 // <-- no more Java code from this thread after this point -->
4054 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop
4055 // the compiler threads at safepoint
4056 // <-- do not use anything that could get blocked by Safepoint -->
4057 // + Disable tracing at JNI/JVM barriers
4058 // + Set _vm_exited flag for threads that are still running native code
4059 // + Delete this thread
4060 // + Call exit_globals()
4061 // > deletes tty
4062 // > deletes PerfMemory resources
4063 // + Return to caller
4064
4065 bool Threads::destroy_vm() {
4066 JavaThread* thread = JavaThread::current();
4067
4068 #ifdef ASSERT
4069 _vm_complete = false;
4070 #endif
4071 // Wait until we are the last non-daemon thread to execute
4072 { MutexLocker nu(Threads_lock);
4073 while (Threads::number_of_non_daemon_threads() > 1 )
4074 // This wait should make safepoint checks, wait without a timeout,
4075 // and wait as a suspend-equivalent condition.
4076 //
4077 // Note: If the FlatProfiler is running and this thread is waiting
4078 // for another non-daemon thread to finish, then the FlatProfiler
4079 // is waiting for the external suspend request on this thread to
4080 // complete. wait_for_ext_suspend_completion() will eventually
4081 // timeout, but that takes time. Making this wait a suspend-
4082 // equivalent condition solves that timeout problem.
4083 //
4084 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0,
4085 Mutex::_as_suspend_equivalent_flag);
4086 }
4087
4088 // Hang forever on exit if we are reporting an error.
4089 if (ShowMessageBoxOnError && is_error_reported()) {
4090 os::infinite_sleep();
4091 }
4092 os::wait_for_keypress_at_exit();
4093
4094 if (JDK_Version::is_jdk12x_version()) {
4095 // We are the last thread running, so check if finalizers should be run.
4096 // For 1.3 or later this is done in thread->invoke_shutdown_hooks()
4097 HandleMark rm(thread);
4098 Universe::run_finalizers_on_exit();
4099 } else {
4100 // run Java level shutdown hooks
4101 thread->invoke_shutdown_hooks();
4102 }
4103
4104 before_exit(thread);
4105
4106 thread->exit(true);
4107
4108 // Stop VM thread.
4109 {
4110 // 4945125 The vm thread comes to a safepoint during exit.
4111 // GC vm_operations can get caught at the safepoint, and the
4112 // heap is unparseable if they are caught. Grab the Heap_lock
4113 // to prevent this. The GC vm_operations will not be able to
4114 // queue until after the vm thread is dead.
4115 // After this point, we'll never emerge out of the safepoint before
4116 // the VM exits, so concurrent GC threads do not need to be explicitly
4117 // stopped; they remain inactive until the process exits.
4118 // Note: some concurrent G1 threads may be running during a safepoint,
4119 // but these will not be accessing the heap, just some G1-specific side
4120 // data structures that are not accessed by any other threads but them
4121 // after this point in a terminal safepoint.
4122
4123 MutexLocker ml(Heap_lock);
4124
4125 VMThread::wait_for_vm_thread_exit();
4126 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint");
4127 VMThread::destroy();
4128 }
4129
4130 // clean up ideal graph printers
4131 #if defined(COMPILER2) && !defined(PRODUCT)
4132 IdealGraphPrinter::clean_up();
4133 #endif
4134
4135 // Now, all Java threads are gone except daemon threads. Daemon threads
4136 // running Java code or in VM are stopped by the Safepoint. However,
4137 // daemon threads executing native code are still running. But they
4138 // will be stopped at native=>Java/VM barriers. Note that we can't
4139 // simply kill or suspend them, as it is inherently deadlock-prone.
4140
4141 #ifndef PRODUCT
4142 // disable function tracing at JNI/JVM barriers
4143 TraceJNICalls = false;
4144 TraceJVMCalls = false;
4145 TraceRuntimeCalls = false;
4146 #endif
4147
4148 VM_Exit::set_vm_exited();
4149
4150 notify_vm_shutdown();
4151
4152 delete thread;
4153
4154 #ifdef GRAAL
4155 if (GraalCounterSize > 0) {
4156 FREE_C_HEAP_ARRAY(jlong, JavaThread::_graal_old_thread_counters, mtInternal);
4157 }
4158 #endif // GRAAL
4159
4160 // exit_globals() will delete tty
4161 exit_globals();
4162
4163 return true;
4164 }
4165
4166
4167 jboolean Threads::is_supported_jni_version_including_1_1(jint version) {
4168 if (version == JNI_VERSION_1_1) return JNI_TRUE;
4169 return is_supported_jni_version(version);
4170 }
4171
4172
4173 jboolean Threads::is_supported_jni_version(jint version) {
4174 if (version == JNI_VERSION_1_2) return JNI_TRUE;
4175 if (version == JNI_VERSION_1_4) return JNI_TRUE;
4176 if (version == JNI_VERSION_1_6) return JNI_TRUE;
4177 if (version == JNI_VERSION_1_8) return JNI_TRUE;
4178 return JNI_FALSE;
4179 }
4180
4181
4182 void Threads::add(JavaThread* p, bool force_daemon) {
4183 // The threads lock must be owned at this point
4184 assert_locked_or_safepoint(Threads_lock);
4185
4186 // See the comment for this method in thread.hpp for its purpose and
4187 // why it is called here.
4188 p->initialize_queues();
4189 p->set_next(_thread_list);
4190 _thread_list = p;
4191 _number_of_threads++;
4192 oop threadObj = p->threadObj();
4193 bool daemon = true;
4194 // Bootstrapping problem: threadObj can be null for initial
4195 // JavaThread (or for threads attached via JNI)
4196 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) {
4197 _number_of_non_daemon_threads++;
4198 daemon = false;
4199 }
4200
4201 p->set_safepoint_visible(true);
4202
4203 ThreadService::add_thread(p, daemon);
4204
4205 // Possible GC point.
4206 Events::log(p, "Thread added: " INTPTR_FORMAT, p);
4207 }
4208
4209 void Threads::remove(JavaThread* p) {
4210 // Extra scope needed for Thread_lock, so we can check
4211 // that we do not remove thread without safepoint code notice
4212 { MutexLocker ml(Threads_lock);
4213
4214 assert(includes(p), "p must be present");
4215
4216 JavaThread* current = _thread_list;
4217 JavaThread* prev = NULL;
4218
4219 while (current != p) {
4220 prev = current;
4221 current = current->next();
4222 }
4223
4224 if (prev) {
4225 prev->set_next(current->next());
4226 } else {
4227 _thread_list = p->next();
4228 }
4229 _number_of_threads--;
4230 oop threadObj = p->threadObj();
4231 bool daemon = true;
4232 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) {
4233 _number_of_non_daemon_threads--;
4234 daemon = false;
4235
4236 // Only one thread left, do a notify on the Threads_lock so a thread waiting
4237 // on destroy_vm will wake up.
4238 if (number_of_non_daemon_threads() == 1)
4239 Threads_lock->notify_all();
4240 }
4241 ThreadService::remove_thread(p, daemon);
4242
4243 // Make sure that safepoint code disregard this thread. This is needed since
4244 // the thread might mess around with locks after this point. This can cause it
4245 // to do callbacks into the safepoint code. However, the safepoint code is not aware
4246 // of this thread since it is removed from the queue.
4247 p->set_terminated_value();
4248
4249 // Now, this thread is not visible to safepoint
4250 p->set_safepoint_visible(false);
4251 // once the thread becomes safepoint invisible, we can not use its per-thread
4252 // recorder. And Threads::do_threads() no longer walks this thread, so we have
4253 // to release its per-thread recorder here.
4254 MemTracker::thread_exiting(p);
4255 } // unlock Threads_lock
4256
4257 // Since Events::log uses a lock, we grab it outside the Threads_lock
4258 Events::log(p, "Thread exited: " INTPTR_FORMAT, p);
4259 }
4260
4261 // Threads_lock must be held when this is called (or must be called during a safepoint)
4262 bool Threads::includes(JavaThread* p) {
4263 assert(Threads_lock->is_locked(), "sanity check");
4264 ALL_JAVA_THREADS(q) {
4265 if (q == p ) {
4266 return true;
4267 }
4268 }
4269 return false;
4270 }
4271
4272 // Operations on the Threads list for GC. These are not explicitly locked,
4273 // but the garbage collector must provide a safe context for them to run.
4274 // In particular, these things should never be called when the Threads_lock
4275 // is held by some other thread. (Note: the Safepoint abstraction also
4276 // uses the Threads_lock to gurantee this property. It also makes sure that
4277 // all threads gets blocked when exiting or starting).
4278
4279 void Threads::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) {
4280 ALL_JAVA_THREADS(p) {
4281 p->oops_do(f, cld_f, cf);
4282 }
4283 VMThread::vm_thread()->oops_do(f, cld_f, cf);
4284 }
4285
4286 void Threads::possibly_parallel_oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) {
4287 // Introduce a mechanism allowing parallel threads to claim threads as
4288 // root groups. Overhead should be small enough to use all the time,
4289 // even in sequential code.
4290 SharedHeap* sh = SharedHeap::heap();
4291 // Cannot yet substitute active_workers for n_par_threads
4292 // because of G1CollectedHeap::verify() use of
4293 // SharedHeap::process_strong_roots(). n_par_threads == 0 will
4294 // turn off parallelism in process_strong_roots while active_workers
4295 // is being used for parallelism elsewhere.
4296 bool is_par = sh->n_par_threads() > 0;
4297 assert(!is_par ||
4298 (SharedHeap::heap()->n_par_threads() ==
4299 SharedHeap::heap()->workers()->active_workers()), "Mismatch");
4300 int cp = SharedHeap::heap()->strong_roots_parity();
4301 ALL_JAVA_THREADS(p) {
4302 if (p->claim_oops_do(is_par, cp)) {
4303 p->oops_do(f, cld_f, cf);
4304 }
4305 }
4306 VMThread* vmt = VMThread::vm_thread();
4307 if (vmt->claim_oops_do(is_par, cp)) {
4308 vmt->oops_do(f, cld_f, cf);
4309 }
4310 }
4311
4312 #if INCLUDE_ALL_GCS
4313 // Used by ParallelScavenge
4314 void Threads::create_thread_roots_tasks(GCTaskQueue* q) {
4315 ALL_JAVA_THREADS(p) {
4316 q->enqueue(new ThreadRootsTask(p));
4317 }
4318 q->enqueue(new ThreadRootsTask(VMThread::vm_thread()));
4319 }
4320
4321 // Used by Parallel Old
4322 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) {
4323 ALL_JAVA_THREADS(p) {
4324 q->enqueue(new ThreadRootsMarkingTask(p));
4325 }
4326 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread()));
4327 }
4328 #endif // INCLUDE_ALL_GCS
4329
4330 void Threads::nmethods_do(CodeBlobClosure* cf) {
4331 ALL_JAVA_THREADS(p) {
4332 p->nmethods_do(cf);
4333 }
4334 VMThread::vm_thread()->nmethods_do(cf);
4335 }
4336
4337 void Threads::metadata_do(void f(Metadata*)) {
4338 ALL_JAVA_THREADS(p) {
4339 p->metadata_do(f);
4340 }
4341 }
4342
4343 void Threads::gc_epilogue() {
4344 ALL_JAVA_THREADS(p) {
4345 p->gc_epilogue();
4346 }
4347 }
4348
4349 void Threads::gc_prologue() {
4350 ALL_JAVA_THREADS(p) {
4351 p->gc_prologue();
4352 }
4353 }
4354
4355 void Threads::deoptimized_wrt_marked_nmethods() {
4356 ALL_JAVA_THREADS(p) {
4357 p->deoptimized_wrt_marked_nmethods();
4358 }
4359 }
4360
4361
4362 // Get count Java threads that are waiting to enter the specified monitor.
4363 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count,
4364 address monitor, bool doLock) {
4365 assert(doLock || SafepointSynchronize::is_at_safepoint(),
4366 "must grab Threads_lock or be at safepoint");
4367 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count);
4368
4369 int i = 0;
4370 {
4371 MutexLockerEx ml(doLock ? Threads_lock : NULL);
4372 ALL_JAVA_THREADS(p) {
4373 if (!p->can_call_java()) continue;
4374
4375 address pending = (address)p->current_pending_monitor();
4376 if (pending == monitor) { // found a match
4377 if (i < count) result->append(p); // save the first count matches
4378 i++;
4379 }
4380 }
4381 }
4382 return result;
4383 }
4384
4385
4386 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) {
4387 assert(doLock ||
4388 Threads_lock->owned_by_self() ||
4389 SafepointSynchronize::is_at_safepoint(),
4390 "must grab Threads_lock or be at safepoint");
4391
4392 // NULL owner means not locked so we can skip the search
4393 if (owner == NULL) return NULL;
4394
4395 {
4396 MutexLockerEx ml(doLock ? Threads_lock : NULL);
4397 ALL_JAVA_THREADS(p) {
4398 // first, see if owner is the address of a Java thread
4399 if (owner == (address)p) return p;
4400 }
4401 }
4402 // Cannot assert on lack of success here since this function may be
4403 // used by code that is trying to report useful problem information
4404 // like deadlock detection.
4405 if (UseHeavyMonitors) return NULL;
4406
4407 //
4408 // If we didn't find a matching Java thread and we didn't force use of
4409 // heavyweight monitors, then the owner is the stack address of the
4410 // Lock Word in the owning Java thread's stack.
4411 //
4412 JavaThread* the_owner = NULL;
4413 {
4414 MutexLockerEx ml(doLock ? Threads_lock : NULL);
4415 ALL_JAVA_THREADS(q) {
4416 if (q->is_lock_owned(owner)) {
4417 the_owner = q;
4418 break;
4419 }
4420 }
4421 }
4422 // cannot assert on lack of success here; see above comment
4423 return the_owner;
4424 }
4425
4426 // Threads::print_on() is called at safepoint by VM_PrintThreads operation.
4427 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) {
4428 char buf[32];
4429 st->print_cr(os::local_time_string(buf, sizeof(buf)));
4430
4431 st->print_cr("Full thread dump %s (%s %s):",
4432 Abstract_VM_Version::vm_name(),
4433 Abstract_VM_Version::vm_release(),
4434 Abstract_VM_Version::vm_info_string()
4435 );
4436 st->cr();
4437
4438 #if INCLUDE_ALL_GCS
4439 // Dump concurrent locks
4440 ConcurrentLocksDump concurrent_locks;
4441 if (print_concurrent_locks) {
4442 concurrent_locks.dump_at_safepoint();
4443 }
4444 #endif // INCLUDE_ALL_GCS
4445
4446 ALL_JAVA_THREADS(p) {
4447 ResourceMark rm;
4448 p->print_on(st);
4449 if (print_stacks) {
4450 if (internal_format) {
4451 p->trace_stack();
4452 } else {
4453 p->print_stack_on(st);
4454 }
4455 }
4456 st->cr();
4457 #if INCLUDE_ALL_GCS
4458 if (print_concurrent_locks) {
4459 concurrent_locks.print_locks_on(p, st);
4460 }
4461 #endif // INCLUDE_ALL_GCS
4462 }
4463
4464 VMThread::vm_thread()->print_on(st);
4465 st->cr();
4466 Universe::heap()->print_gc_threads_on(st);
4467 WatcherThread* wt = WatcherThread::watcher_thread();
4468 if (wt != NULL) {
4469 wt->print_on(st);
4470 st->cr();
4471 }
4472 CompileBroker::print_compiler_threads_on(st);
4473 st->flush();
4474 }
4475
4476 // Threads::print_on_error() is called by fatal error handler. It's possible
4477 // that VM is not at safepoint and/or current thread is inside signal handler.
4478 // Don't print stack trace, as the stack may not be walkable. Don't allocate
4479 // memory (even in resource area), it might deadlock the error handler.
4480 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) {
4481 bool found_current = false;
4482 st->print_cr("Java Threads: ( => current thread )");
4483 ALL_JAVA_THREADS(thread) {
4484 bool is_current = (current == thread);
4485 found_current = found_current || is_current;
4486
4487 st->print("%s", is_current ? "=>" : " ");
4488
4489 st->print(PTR_FORMAT, thread);
4490 st->print(" ");
4491 thread->print_on_error(st, buf, buflen);
4492 st->cr();
4493 }
4494 st->cr();
4495
4496 st->print_cr("Other Threads:");
4497 if (VMThread::vm_thread()) {
4498 bool is_current = (current == VMThread::vm_thread());
4499 found_current = found_current || is_current;
4500 st->print("%s", current == VMThread::vm_thread() ? "=>" : " ");
4501
4502 st->print(PTR_FORMAT, VMThread::vm_thread());
4503 st->print(" ");
4504 VMThread::vm_thread()->print_on_error(st, buf, buflen);
4505 st->cr();
4506 }
4507 WatcherThread* wt = WatcherThread::watcher_thread();
4508 if (wt != NULL) {
4509 bool is_current = (current == wt);
4510 found_current = found_current || is_current;
4511 st->print("%s", is_current ? "=>" : " ");
4512
4513 st->print(PTR_FORMAT, wt);
4514 st->print(" ");
4515 wt->print_on_error(st, buf, buflen);
4516 st->cr();
4517 }
4518 if (!found_current) {
4519 st->cr();
4520 st->print("=>" PTR_FORMAT " (exited) ", current);
4521 current->print_on_error(st, buf, buflen);
4522 st->cr();
4523 }
4524 }
4525
4526 // Internal SpinLock and Mutex
4527 // Based on ParkEvent
4528
4529 // Ad-hoc mutual exclusion primitives: SpinLock and Mux
4530 //
4531 // We employ SpinLocks _only for low-contention, fixed-length
4532 // short-duration critical sections where we're concerned
4533 // about native mutex_t or HotSpot Mutex:: latency.
4534 // The mux construct provides a spin-then-block mutual exclusion
4535 // mechanism.
4536 //
4537 // Testing has shown that contention on the ListLock guarding gFreeList
4538 // is common. If we implement ListLock as a simple SpinLock it's common
4539 // for the JVM to devolve to yielding with little progress. This is true
4540 // despite the fact that the critical sections protected by ListLock are
4541 // extremely short.
4542 //
4543 // TODO-FIXME: ListLock should be of type SpinLock.
4544 // We should make this a 1st-class type, integrated into the lock
4545 // hierarchy as leaf-locks. Critically, the SpinLock structure
4546 // should have sufficient padding to avoid false-sharing and excessive
4547 // cache-coherency traffic.
4548
4549
4550 typedef volatile int SpinLockT ;
4551
4552 void Thread::SpinAcquire (volatile int * adr, const char * LockName) {
4553 if (Atomic::cmpxchg (1, adr, 0) == 0) {
4554 return ; // normal fast-path return
4555 }
4556
4557 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy.
4558 TEVENT (SpinAcquire - ctx) ;
4559 int ctr = 0 ;
4560 int Yields = 0 ;
4561 for (;;) {
4562 while (*adr != 0) {
4563 ++ctr ;
4564 if ((ctr & 0xFFF) == 0 || !os::is_MP()) {
4565 if (Yields > 5) {
4566 // Consider using a simple NakedSleep() instead.
4567 // Then SpinAcquire could be called by non-JVM threads
4568 Thread::current()->_ParkEvent->park(1) ;
4569 } else {
4570 os::NakedYield() ;
4571 ++Yields ;
4572 }
4573 } else {
4574 SpinPause() ;
4575 }
4576 }
4577 if (Atomic::cmpxchg (1, adr, 0) == 0) return ;
4578 }
4579 }
4580
4581 void Thread::SpinRelease (volatile int * adr) {
4582 assert (*adr != 0, "invariant") ;
4583 OrderAccess::fence() ; // guarantee at least release consistency.
4584 // Roach-motel semantics.
4585 // It's safe if subsequent LDs and STs float "up" into the critical section,
4586 // but prior LDs and STs within the critical section can't be allowed
4587 // to reorder or float past the ST that releases the lock.
4588 *adr = 0 ;
4589 }
4590
4591 // muxAcquire and muxRelease:
4592 //
4593 // * muxAcquire and muxRelease support a single-word lock-word construct.
4594 // The LSB of the word is set IFF the lock is held.
4595 // The remainder of the word points to the head of a singly-linked list
4596 // of threads blocked on the lock.
4597 //
4598 // * The current implementation of muxAcquire-muxRelease uses its own
4599 // dedicated Thread._MuxEvent instance. If we're interested in
4600 // minimizing the peak number of extant ParkEvent instances then
4601 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long
4602 // as certain invariants were satisfied. Specifically, care would need
4603 // to be taken with regards to consuming unpark() "permits".
4604 // A safe rule of thumb is that a thread would never call muxAcquire()
4605 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently
4606 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could
4607 // consume an unpark() permit intended for monitorenter, for instance.
4608 // One way around this would be to widen the restricted-range semaphore
4609 // implemented in park(). Another alternative would be to provide
4610 // multiple instances of the PlatformEvent() for each thread. One
4611 // instance would be dedicated to muxAcquire-muxRelease, for instance.
4612 //
4613 // * Usage:
4614 // -- Only as leaf locks
4615 // -- for short-term locking only as muxAcquire does not perform
4616 // thread state transitions.
4617 //
4618 // Alternatives:
4619 // * We could implement muxAcquire and muxRelease with MCS or CLH locks
4620 // but with parking or spin-then-park instead of pure spinning.
4621 // * Use Taura-Oyama-Yonenzawa locks.
4622 // * It's possible to construct a 1-0 lock if we encode the lockword as
4623 // (List,LockByte). Acquire will CAS the full lockword while Release
4624 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so
4625 // acquiring threads use timers (ParkTimed) to detect and recover from
4626 // the stranding window. Thread/Node structures must be aligned on 256-byte
4627 // boundaries by using placement-new.
4628 // * Augment MCS with advisory back-link fields maintained with CAS().
4629 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner.
4630 // The validity of the backlinks must be ratified before we trust the value.
4631 // If the backlinks are invalid the exiting thread must back-track through the
4632 // the forward links, which are always trustworthy.
4633 // * Add a successor indication. The LockWord is currently encoded as
4634 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable
4635 // to provide the usual futile-wakeup optimization.
4636 // See RTStt for details.
4637 // * Consider schedctl.sc_nopreempt to cover the critical section.
4638 //
4639
4640
4641 typedef volatile intptr_t MutexT ; // Mux Lock-word
4642 enum MuxBits { LOCKBIT = 1 } ;
4643
4644 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) {
4645 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ;
4646 if (w == 0) return ;
4647 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) {
4648 return ;
4649 }
4650
4651 TEVENT (muxAcquire - Contention) ;
4652 ParkEvent * const Self = Thread::current()->_MuxEvent ;
4653 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ;
4654 for (;;) {
4655 int its = (os::is_MP() ? 100 : 0) + 1 ;
4656
4657 // Optional spin phase: spin-then-park strategy
4658 while (--its >= 0) {
4659 w = *Lock ;
4660 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) {
4661 return ;
4662 }
4663 }
4664
4665 Self->reset() ;
4666 Self->OnList = intptr_t(Lock) ;
4667 // The following fence() isn't _strictly necessary as the subsequent
4668 // CAS() both serializes execution and ratifies the fetched *Lock value.
4669 OrderAccess::fence();
4670 for (;;) {
4671 w = *Lock ;
4672 if ((w & LOCKBIT) == 0) {
4673 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) {
4674 Self->OnList = 0 ; // hygiene - allows stronger asserts
4675 return ;
4676 }
4677 continue ; // Interference -- *Lock changed -- Just retry
4678 }
4679 assert (w & LOCKBIT, "invariant") ;
4680 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT );
4681 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ;
4682 }
4683
4684 while (Self->OnList != 0) {
4685 Self->park() ;
4686 }
4687 }
4688 }
4689
4690 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) {
4691 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ;
4692 if (w == 0) return ;
4693 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) {
4694 return ;
4695 }
4696
4697 TEVENT (muxAcquire - Contention) ;
4698 ParkEvent * ReleaseAfter = NULL ;
4699 if (ev == NULL) {
4700 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ;
4701 }
4702 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ;
4703 for (;;) {
4704 guarantee (ev->OnList == 0, "invariant") ;
4705 int its = (os::is_MP() ? 100 : 0) + 1 ;
4706
4707 // Optional spin phase: spin-then-park strategy
4708 while (--its >= 0) {
4709 w = *Lock ;
4710 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) {
4711 if (ReleaseAfter != NULL) {
4712 ParkEvent::Release (ReleaseAfter) ;
4713 }
4714 return ;
4715 }
4716 }
4717
4718 ev->reset() ;
4719 ev->OnList = intptr_t(Lock) ;
4720 // The following fence() isn't _strictly necessary as the subsequent
4721 // CAS() both serializes execution and ratifies the fetched *Lock value.
4722 OrderAccess::fence();
4723 for (;;) {
4724 w = *Lock ;
4725 if ((w & LOCKBIT) == 0) {
4726 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) {
4727 ev->OnList = 0 ;
4728 // We call ::Release while holding the outer lock, thus
4729 // artificially lengthening the critical section.
4730 // Consider deferring the ::Release() until the subsequent unlock(),
4731 // after we've dropped the outer lock.
4732 if (ReleaseAfter != NULL) {
4733 ParkEvent::Release (ReleaseAfter) ;
4734 }
4735 return ;
4736 }
4737 continue ; // Interference -- *Lock changed -- Just retry
4738 }
4739 assert (w & LOCKBIT, "invariant") ;
4740 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT );
4741 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ;
4742 }
4743
4744 while (ev->OnList != 0) {
4745 ev->park() ;
4746 }
4747 }
4748 }
4749
4750 // Release() must extract a successor from the list and then wake that thread.
4751 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme
4752 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based
4753 // Release() would :
4754 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list.
4755 // (B) Extract a successor from the private list "in-hand"
4756 // (C) attempt to CAS() the residual back into *Lock over null.
4757 // If there were any newly arrived threads and the CAS() would fail.
4758 // In that case Release() would detach the RATs, re-merge the list in-hand
4759 // with the RATs and repeat as needed. Alternately, Release() might
4760 // detach and extract a successor, but then pass the residual list to the wakee.
4761 // The wakee would be responsible for reattaching and remerging before it
4762 // competed for the lock.
4763 //
4764 // Both "pop" and DMR are immune from ABA corruption -- there can be
4765 // multiple concurrent pushers, but only one popper or detacher.
4766 // This implementation pops from the head of the list. This is unfair,
4767 // but tends to provide excellent throughput as hot threads remain hot.
4768 // (We wake recently run threads first).
4769
4770 void Thread::muxRelease (volatile intptr_t * Lock) {
4771 for (;;) {
4772 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ;
4773 assert (w & LOCKBIT, "invariant") ;
4774 if (w == LOCKBIT) return ;
4775 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ;
4776 assert (List != NULL, "invariant") ;
4777 assert (List->OnList == intptr_t(Lock), "invariant") ;
4778 ParkEvent * nxt = List->ListNext ;
4779
4780 // The following CAS() releases the lock and pops the head element.
4781 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) {
4782 continue ;
4783 }
4784 List->OnList = 0 ;
4785 OrderAccess::fence() ;
4786 List->unpark () ;
4787 return ;
4788 }
4789 }
4790
4791
4792 void Threads::verify() {
4793 ALL_JAVA_THREADS(p) {
4794 p->verify();
4795 }
4796 VMThread* thread = VMThread::vm_thread();
4797 if (thread != NULL) thread->verify();
4798 }
4799
4800 #ifdef GRAAL
4801 void JavaThread::initialize_gpu_hsail_tlabs(jint count) {
4802 if (!UseTLAB) return;
4803 // create tlabs
4804 _gpu_hsail_tlabs = NEW_C_HEAP_ARRAY(ThreadLocalAllocBuffer*, count, mtInternal);
4805 // initialize
4806 for (jint i = 0; i < count; i++) {
4807 _gpu_hsail_tlabs[i] = new ThreadLocalAllocBuffer();
4808 _gpu_hsail_tlabs[i]->initialize(Thread::current());
4809 }
4810 _gpu_hsail_tlabs_count = count;
4811 }
4812
4813 ThreadLocalAllocBuffer* JavaThread::get_gpu_hsail_tlab_at(jint idx) {
4814 assert(idx >= 0 && idx < get_gpu_hsail_tlabs_count(), "illegal gpu tlab index");
4815 return _gpu_hsail_tlabs[idx];
4816 }
4817
4818 void JavaThread::gpu_hsail_tlabs_make_parsable(bool retire) {
4819 for (jint i = 0; i < get_gpu_hsail_tlabs_count(); i++) {
4820 get_gpu_hsail_tlab_at(i)->make_parsable(retire);
4821 }
4822 }
4823
4824 void JavaThread::delete_gpu_hsail_tlabs() {
4825 if (!UseTLAB) return;
4826 if (_gpu_hsail_tlabs_count == 0) return;
4827
4828 gpu_hsail_tlabs_make_parsable(true);
4829 for (jint i = 0; i < get_gpu_hsail_tlabs_count(); i++) {
4830 delete get_gpu_hsail_tlab_at(i);
4831 }
4832 FREE_C_HEAP_ARRAY(ThreadLocalAllocBuffer*, _gpu_hsail_tlabs, mtInternal);
4833 _gpu_hsail_tlabs = NULL;
4834 _gpu_hsail_tlabs_count = 0;
4835 }
4836
4837
4838 #endif
4839