Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.cpp @ 360:5d254928c888
Merge
author | ysr |
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date | Wed, 27 Aug 2008 11:20:46 -0700 |
parents | 3529d0e8d09c 1ee8caae33af |
children | 032ddb9432ad |
rev | line source |
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0 | 1 /* |
196 | 2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_thread.cpp.incl" | |
27 | |
28 #ifdef DTRACE_ENABLED | |
29 | |
30 // Only bother with this argument setup if dtrace is available | |
31 | |
32 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); | |
33 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
34 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
35 intptr_t, intptr_t, bool); | |
36 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
37 intptr_t, intptr_t, bool); | |
38 | |
39 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
40 { \ | |
41 ResourceMark rm(this); \ | |
42 int len = 0; \ | |
43 const char* name = (javathread)->get_thread_name(); \ | |
44 len = strlen(name); \ | |
45 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
46 name, len, \ | |
47 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
48 (javathread)->osthread()->thread_id(), \ | |
49 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
50 } | |
51 | |
52 #else // ndef DTRACE_ENABLED | |
53 | |
54 #define DTRACE_THREAD_PROBE(probe, javathread) | |
55 | |
56 #endif // ndef DTRACE_ENABLED | |
57 | |
58 // Class hierarchy | |
59 // - Thread | |
60 // - VMThread | |
61 // - WatcherThread | |
62 // - ConcurrentMarkSweepThread | |
63 // - JavaThread | |
64 // - CompilerThread | |
65 | |
66 // ======= Thread ======== | |
67 | |
68 // Support for forcing alignment of thread objects for biased locking | |
69 void* Thread::operator new(size_t size) { | |
70 if (UseBiasedLocking) { | |
71 const int alignment = markOopDesc::biased_lock_alignment; | |
72 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
73 void* real_malloc_addr = CHeapObj::operator new(aligned_size); | |
74 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); | |
75 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
76 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
77 "JavaThread alignment code overflowed allocated storage"); | |
78 if (TraceBiasedLocking) { | |
79 if (aligned_addr != real_malloc_addr) | |
80 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
81 real_malloc_addr, aligned_addr); | |
82 } | |
83 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
84 return aligned_addr; | |
85 } else { | |
86 return CHeapObj::operator new(size); | |
87 } | |
88 } | |
89 | |
90 void Thread::operator delete(void* p) { | |
91 if (UseBiasedLocking) { | |
92 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
93 CHeapObj::operator delete(real_malloc_addr); | |
94 } else { | |
95 CHeapObj::operator delete(p); | |
96 } | |
97 } | |
98 | |
99 | |
100 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
101 // JavaThread | |
102 | |
103 | |
104 Thread::Thread() { | |
105 // stack | |
106 _stack_base = NULL; | |
107 _stack_size = 0; | |
108 _self_raw_id = 0; | |
109 _lgrp_id = -1; | |
110 _osthread = NULL; | |
111 | |
112 // allocated data structures | |
113 set_resource_area(new ResourceArea()); | |
114 set_handle_area(new HandleArea(NULL)); | |
115 set_active_handles(NULL); | |
116 set_free_handle_block(NULL); | |
117 set_last_handle_mark(NULL); | |
118 set_osthread(NULL); | |
119 | |
120 // This initial value ==> never claimed. | |
121 _oops_do_parity = 0; | |
122 | |
123 // the handle mark links itself to last_handle_mark | |
124 new HandleMark(this); | |
125 | |
126 // plain initialization | |
127 debug_only(_owned_locks = NULL;) | |
128 debug_only(_allow_allocation_count = 0;) | |
129 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
130 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) | |
131 _highest_lock = NULL; | |
132 _jvmti_env_iteration_count = 0; | |
133 _vm_operation_started_count = 0; | |
134 _vm_operation_completed_count = 0; | |
135 _current_pending_monitor = NULL; | |
136 _current_pending_monitor_is_from_java = true; | |
137 _current_waiting_monitor = NULL; | |
138 _num_nested_signal = 0; | |
139 omFreeList = NULL ; | |
140 omFreeCount = 0 ; | |
141 omFreeProvision = 32 ; | |
142 | |
143 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); | |
144 _suspend_flags = 0; | |
145 | |
146 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
147 _hashStateX = os::random() ; | |
148 _hashStateY = 842502087 ; | |
149 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
150 _hashStateW = 273326509 ; | |
151 | |
152 _OnTrap = 0 ; | |
153 _schedctl = NULL ; | |
154 _Stalled = 0 ; | |
155 _TypeTag = 0x2BAD ; | |
156 | |
157 // Many of the following fields are effectively final - immutable | |
158 // Note that nascent threads can't use the Native Monitor-Mutex | |
159 // construct until the _MutexEvent is initialized ... | |
160 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
161 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
162 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
163 // and ::Release() | |
164 _ParkEvent = ParkEvent::Allocate (this) ; | |
165 _SleepEvent = ParkEvent::Allocate (this) ; | |
166 _MutexEvent = ParkEvent::Allocate (this) ; | |
167 _MuxEvent = ParkEvent::Allocate (this) ; | |
168 | |
169 #ifdef CHECK_UNHANDLED_OOPS | |
170 if (CheckUnhandledOops) { | |
171 _unhandled_oops = new UnhandledOops(this); | |
172 } | |
173 #endif // CHECK_UNHANDLED_OOPS | |
174 #ifdef ASSERT | |
175 if (UseBiasedLocking) { | |
176 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
177 assert(this == _real_malloc_address || | |
178 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
179 "bug in forced alignment of thread objects"); | |
180 } | |
181 #endif /* ASSERT */ | |
182 } | |
183 | |
184 void Thread::initialize_thread_local_storage() { | |
185 // Note: Make sure this method only calls | |
186 // non-blocking operations. Otherwise, it might not work | |
187 // with the thread-startup/safepoint interaction. | |
188 | |
189 // During Java thread startup, safepoint code should allow this | |
190 // method to complete because it may need to allocate memory to | |
191 // store information for the new thread. | |
192 | |
193 // initialize structure dependent on thread local storage | |
194 ThreadLocalStorage::set_thread(this); | |
195 | |
196 // set up any platform-specific state. | |
197 os::initialize_thread(); | |
198 | |
199 } | |
200 | |
201 void Thread::record_stack_base_and_size() { | |
202 set_stack_base(os::current_stack_base()); | |
203 set_stack_size(os::current_stack_size()); | |
204 } | |
205 | |
206 | |
207 Thread::~Thread() { | |
208 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
209 ObjectSynchronizer::omFlush (this) ; | |
210 | |
211 // deallocate data structures | |
212 delete resource_area(); | |
213 // since the handle marks are using the handle area, we have to deallocated the root | |
214 // handle mark before deallocating the thread's handle area, | |
215 assert(last_handle_mark() != NULL, "check we have an element"); | |
216 delete last_handle_mark(); | |
217 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
218 | |
219 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
220 // We NULL out the fields for good hygiene. | |
221 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
222 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
223 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
224 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
225 | |
226 delete handle_area(); | |
227 | |
228 // osthread() can be NULL, if creation of thread failed. | |
229 if (osthread() != NULL) os::free_thread(osthread()); | |
230 | |
231 delete _SR_lock; | |
232 | |
233 // clear thread local storage if the Thread is deleting itself | |
234 if (this == Thread::current()) { | |
235 ThreadLocalStorage::set_thread(NULL); | |
236 } else { | |
237 // In the case where we're not the current thread, invalidate all the | |
238 // caches in case some code tries to get the current thread or the | |
239 // thread that was destroyed, and gets stale information. | |
240 ThreadLocalStorage::invalidate_all(); | |
241 } | |
242 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
243 } | |
244 | |
245 // NOTE: dummy function for assertion purpose. | |
246 void Thread::run() { | |
247 ShouldNotReachHere(); | |
248 } | |
249 | |
250 #ifdef ASSERT | |
251 // Private method to check for dangling thread pointer | |
252 void check_for_dangling_thread_pointer(Thread *thread) { | |
253 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
254 "possibility of dangling Thread pointer"); | |
255 } | |
256 #endif | |
257 | |
258 | |
259 #ifndef PRODUCT | |
260 // Tracing method for basic thread operations | |
261 void Thread::trace(const char* msg, const Thread* const thread) { | |
262 if (!TraceThreadEvents) return; | |
263 ResourceMark rm; | |
264 ThreadCritical tc; | |
265 const char *name = "non-Java thread"; | |
266 int prio = -1; | |
267 if (thread->is_Java_thread() | |
268 && !thread->is_Compiler_thread()) { | |
269 // The Threads_lock must be held to get information about | |
270 // this thread but may not be in some situations when | |
271 // tracing thread events. | |
272 bool release_Threads_lock = false; | |
273 if (!Threads_lock->owned_by_self()) { | |
274 Threads_lock->lock(); | |
275 release_Threads_lock = true; | |
276 } | |
277 JavaThread* jt = (JavaThread *)thread; | |
278 name = (char *)jt->get_thread_name(); | |
279 oop thread_oop = jt->threadObj(); | |
280 if (thread_oop != NULL) { | |
281 prio = java_lang_Thread::priority(thread_oop); | |
282 } | |
283 if (release_Threads_lock) { | |
284 Threads_lock->unlock(); | |
285 } | |
286 } | |
287 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
288 } | |
289 #endif | |
290 | |
291 | |
292 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
293 trace("get priority", thread); | |
294 ThreadPriority priority; | |
295 // Can return an error! | |
296 (void)os::get_priority(thread, priority); | |
297 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
298 return priority; | |
299 } | |
300 | |
301 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
302 trace("set priority", thread); | |
303 debug_only(check_for_dangling_thread_pointer(thread);) | |
304 // Can return an error! | |
305 (void)os::set_priority(thread, priority); | |
306 } | |
307 | |
308 | |
309 void Thread::start(Thread* thread) { | |
310 trace("start", thread); | |
311 // Start is different from resume in that its safety is guaranteed by context or | |
312 // being called from a Java method synchronized on the Thread object. | |
313 if (!DisableStartThread) { | |
314 if (thread->is_Java_thread()) { | |
315 // Initialize the thread state to RUNNABLE before starting this thread. | |
316 // Can not set it after the thread started because we do not know the | |
317 // exact thread state at that time. It could be in MONITOR_WAIT or | |
318 // in SLEEPING or some other state. | |
319 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
320 java_lang_Thread::RUNNABLE); | |
321 } | |
322 os::start_thread(thread); | |
323 } | |
324 } | |
325 | |
326 // Enqueue a VM_Operation to do the job for us - sometime later | |
327 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
328 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
329 VMThread::execute(vm_stop); | |
330 } | |
331 | |
332 | |
333 // | |
334 // Check if an external suspend request has completed (or has been | |
335 // cancelled). Returns true if the thread is externally suspended and | |
336 // false otherwise. | |
337 // | |
338 // The bits parameter returns information about the code path through | |
339 // the routine. Useful for debugging: | |
340 // | |
341 // set in is_ext_suspend_completed(): | |
342 // 0x00000001 - routine was entered | |
343 // 0x00000010 - routine return false at end | |
344 // 0x00000100 - thread exited (return false) | |
345 // 0x00000200 - suspend request cancelled (return false) | |
346 // 0x00000400 - thread suspended (return true) | |
347 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
348 // 0x00002000 - thread is native and walkable (return true) | |
349 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
350 // | |
351 // set in wait_for_ext_suspend_completion(): | |
352 // 0x00010000 - routine was entered | |
353 // 0x00020000 - suspend request cancelled before loop (return false) | |
354 // 0x00040000 - thread suspended before loop (return true) | |
355 // 0x00080000 - suspend request cancelled in loop (return false) | |
356 // 0x00100000 - thread suspended in loop (return true) | |
357 // 0x00200000 - suspend not completed during retry loop (return false) | |
358 // | |
359 | |
360 // Helper class for tracing suspend wait debug bits. | |
361 // | |
362 // 0x00000100 indicates that the target thread exited before it could | |
363 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
364 // 0x00080000 each indicate a cancelled suspend request so they don't | |
365 // count as wait failures either. | |
366 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
367 | |
368 class TraceSuspendDebugBits : public StackObj { | |
369 private: | |
370 JavaThread * jt; | |
371 bool is_wait; | |
372 bool called_by_wait; // meaningful when !is_wait | |
373 uint32_t * bits; | |
374 | |
375 public: | |
376 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
377 uint32_t *_bits) { | |
378 jt = _jt; | |
379 is_wait = _is_wait; | |
380 called_by_wait = _called_by_wait; | |
381 bits = _bits; | |
382 } | |
383 | |
384 ~TraceSuspendDebugBits() { | |
385 if (!is_wait) { | |
386 #if 1 | |
387 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
388 // That trace is very chatty. | |
389 return; | |
390 #else | |
391 if (!called_by_wait) { | |
392 // If tracing for is_ext_suspend_completed() is enabled, then only | |
393 // trace calls to it from wait_for_ext_suspend_completion() | |
394 return; | |
395 } | |
396 #endif | |
397 } | |
398 | |
399 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
400 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
401 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
402 ResourceMark rm; | |
403 | |
404 tty->print_cr( | |
405 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
406 jt->get_thread_name(), *bits); | |
407 | |
408 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
409 } | |
410 } | |
411 } | |
412 }; | |
413 #undef DEBUG_FALSE_BITS | |
414 | |
415 | |
416 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
417 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
418 | |
419 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
420 bool do_trans_retry; // flag to force the retry | |
421 | |
422 *bits |= 0x00000001; | |
423 | |
424 do { | |
425 do_trans_retry = false; | |
426 | |
427 if (is_exiting()) { | |
428 // Thread is in the process of exiting. This is always checked | |
429 // first to reduce the risk of dereferencing a freed JavaThread. | |
430 *bits |= 0x00000100; | |
431 return false; | |
432 } | |
433 | |
434 if (!is_external_suspend()) { | |
435 // Suspend request is cancelled. This is always checked before | |
436 // is_ext_suspended() to reduce the risk of a rogue resume | |
437 // confusing the thread that made the suspend request. | |
438 *bits |= 0x00000200; | |
439 return false; | |
440 } | |
441 | |
442 if (is_ext_suspended()) { | |
443 // thread is suspended | |
444 *bits |= 0x00000400; | |
445 return true; | |
446 } | |
447 | |
448 // Now that we no longer do hard suspends of threads running | |
449 // native code, the target thread can be changing thread state | |
450 // while we are in this routine: | |
451 // | |
452 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
453 // | |
454 // We save a copy of the thread state as observed at this moment | |
455 // and make our decision about suspend completeness based on the | |
456 // copy. This closes the race where the thread state is seen as | |
457 // _thread_in_native_trans in the if-thread_blocked check, but is | |
458 // seen as _thread_blocked in if-thread_in_native_trans check. | |
459 JavaThreadState save_state = thread_state(); | |
460 | |
461 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
462 // If the thread's state is _thread_blocked and this blocking | |
463 // condition is known to be equivalent to a suspend, then we can | |
464 // consider the thread to be externally suspended. This means that | |
465 // the code that sets _thread_blocked has been modified to do | |
466 // self-suspension if the blocking condition releases. We also | |
467 // used to check for CONDVAR_WAIT here, but that is now covered by | |
468 // the _thread_blocked with self-suspension check. | |
469 // | |
470 // Return true since we wouldn't be here unless there was still an | |
471 // external suspend request. | |
472 *bits |= 0x00001000; | |
473 return true; | |
474 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
475 // Threads running native code will self-suspend on native==>VM/Java | |
476 // transitions. If its stack is walkable (should always be the case | |
477 // unless this function is called before the actual java_suspend() | |
478 // call), then the wait is done. | |
479 *bits |= 0x00002000; | |
480 return true; | |
481 } else if (!called_by_wait && !did_trans_retry && | |
482 save_state == _thread_in_native_trans && | |
483 frame_anchor()->walkable()) { | |
484 // The thread is transitioning from thread_in_native to another | |
485 // thread state. check_safepoint_and_suspend_for_native_trans() | |
486 // will force the thread to self-suspend. If it hasn't gotten | |
487 // there yet we may have caught the thread in-between the native | |
488 // code check above and the self-suspend. Lucky us. If we were | |
489 // called by wait_for_ext_suspend_completion(), then it | |
490 // will be doing the retries so we don't have to. | |
491 // | |
492 // Since we use the saved thread state in the if-statement above, | |
493 // there is a chance that the thread has already transitioned to | |
494 // _thread_blocked by the time we get here. In that case, we will | |
495 // make a single unnecessary pass through the logic below. This | |
496 // doesn't hurt anything since we still do the trans retry. | |
497 | |
498 *bits |= 0x00004000; | |
499 | |
500 // Once the thread leaves thread_in_native_trans for another | |
501 // thread state, we break out of this retry loop. We shouldn't | |
502 // need this flag to prevent us from getting back here, but | |
503 // sometimes paranoia is good. | |
504 did_trans_retry = true; | |
505 | |
506 // We wait for the thread to transition to a more usable state. | |
507 for (int i = 1; i <= SuspendRetryCount; i++) { | |
508 // We used to do an "os::yield_all(i)" call here with the intention | |
509 // that yielding would increase on each retry. However, the parameter | |
510 // is ignored on Linux which means the yield didn't scale up. Waiting | |
511 // on the SR_lock below provides a much more predictable scale up for | |
512 // the delay. It also provides a simple/direct point to check for any | |
513 // safepoint requests from the VMThread | |
514 | |
515 // temporarily drops SR_lock while doing wait with safepoint check | |
516 // (if we're a JavaThread - the WatcherThread can also call this) | |
517 // and increase delay with each retry | |
518 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
519 | |
520 // check the actual thread state instead of what we saved above | |
521 if (thread_state() != _thread_in_native_trans) { | |
522 // the thread has transitioned to another thread state so | |
523 // try all the checks (except this one) one more time. | |
524 do_trans_retry = true; | |
525 break; | |
526 } | |
527 } // end retry loop | |
528 | |
529 | |
530 } | |
531 } while (do_trans_retry); | |
532 | |
533 *bits |= 0x00000010; | |
534 return false; | |
535 } | |
536 | |
537 // | |
538 // Wait for an external suspend request to complete (or be cancelled). | |
539 // Returns true if the thread is externally suspended and false otherwise. | |
540 // | |
541 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
542 uint32_t *bits) { | |
543 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
544 false /* !called_by_wait */, bits); | |
545 | |
546 // local flag copies to minimize SR_lock hold time | |
547 bool is_suspended; | |
548 bool pending; | |
549 uint32_t reset_bits; | |
550 | |
551 // set a marker so is_ext_suspend_completed() knows we are the caller | |
552 *bits |= 0x00010000; | |
553 | |
554 // We use reset_bits to reinitialize the bits value at the top of | |
555 // each retry loop. This allows the caller to make use of any | |
556 // unused bits for their own marking purposes. | |
557 reset_bits = *bits; | |
558 | |
559 { | |
560 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
561 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
562 delay, bits); | |
563 pending = is_external_suspend(); | |
564 } | |
565 // must release SR_lock to allow suspension to complete | |
566 | |
567 if (!pending) { | |
568 // A cancelled suspend request is the only false return from | |
569 // is_ext_suspend_completed() that keeps us from entering the | |
570 // retry loop. | |
571 *bits |= 0x00020000; | |
572 return false; | |
573 } | |
574 | |
575 if (is_suspended) { | |
576 *bits |= 0x00040000; | |
577 return true; | |
578 } | |
579 | |
580 for (int i = 1; i <= retries; i++) { | |
581 *bits = reset_bits; // reinit to only track last retry | |
582 | |
583 // We used to do an "os::yield_all(i)" call here with the intention | |
584 // that yielding would increase on each retry. However, the parameter | |
585 // is ignored on Linux which means the yield didn't scale up. Waiting | |
586 // on the SR_lock below provides a much more predictable scale up for | |
587 // the delay. It also provides a simple/direct point to check for any | |
588 // safepoint requests from the VMThread | |
589 | |
590 { | |
591 MutexLocker ml(SR_lock()); | |
592 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
593 // can also call this) and increase delay with each retry | |
594 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
595 | |
596 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
597 delay, bits); | |
598 | |
599 // It is possible for the external suspend request to be cancelled | |
600 // (by a resume) before the actual suspend operation is completed. | |
601 // Refresh our local copy to see if we still need to wait. | |
602 pending = is_external_suspend(); | |
603 } | |
604 | |
605 if (!pending) { | |
606 // A cancelled suspend request is the only false return from | |
607 // is_ext_suspend_completed() that keeps us from staying in the | |
608 // retry loop. | |
609 *bits |= 0x00080000; | |
610 return false; | |
611 } | |
612 | |
613 if (is_suspended) { | |
614 *bits |= 0x00100000; | |
615 return true; | |
616 } | |
617 } // end retry loop | |
618 | |
619 // thread did not suspend after all our retries | |
620 *bits |= 0x00200000; | |
621 return false; | |
622 } | |
623 | |
624 #ifndef PRODUCT | |
625 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
626 | |
627 // This should not need to be atomic as the only way for simultaneous | |
628 // updates is via interrupts. Even then this should be rare or non-existant | |
629 // and we don't care that much anyway. | |
630 | |
631 int index = _jmp_ring_index; | |
632 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
633 _jmp_ring[index]._target = (intptr_t) target; | |
634 _jmp_ring[index]._instruction = (intptr_t) instr; | |
635 _jmp_ring[index]._file = file; | |
636 _jmp_ring[index]._line = line; | |
637 } | |
638 #endif /* PRODUCT */ | |
639 | |
640 // Called by flat profiler | |
641 // Callers have already called wait_for_ext_suspend_completion | |
642 // The assertion for that is currently too complex to put here: | |
643 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
644 bool gotframe = false; | |
645 // self suspension saves needed state. | |
646 if (has_last_Java_frame() && _anchor.walkable()) { | |
647 *_fr = pd_last_frame(); | |
648 gotframe = true; | |
649 } | |
650 return gotframe; | |
651 } | |
652 | |
653 void Thread::interrupt(Thread* thread) { | |
654 trace("interrupt", thread); | |
655 debug_only(check_for_dangling_thread_pointer(thread);) | |
656 os::interrupt(thread); | |
657 } | |
658 | |
659 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
660 trace("is_interrupted", thread); | |
661 debug_only(check_for_dangling_thread_pointer(thread);) | |
662 // Note: If clear_interrupted==false, this simply fetches and | |
663 // returns the value of the field osthread()->interrupted(). | |
664 return os::is_interrupted(thread, clear_interrupted); | |
665 } | |
666 | |
667 | |
668 // GC Support | |
669 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
670 jint thread_parity = _oops_do_parity; | |
671 if (thread_parity != strong_roots_parity) { | |
672 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
673 if (res == thread_parity) return true; | |
674 else { | |
675 guarantee(res == strong_roots_parity, "Or else what?"); | |
676 assert(SharedHeap::heap()->n_par_threads() > 0, | |
677 "Should only fail when parallel."); | |
678 return false; | |
679 } | |
680 } | |
681 assert(SharedHeap::heap()->n_par_threads() > 0, | |
682 "Should only fail when parallel."); | |
683 return false; | |
684 } | |
685 | |
686 void Thread::oops_do(OopClosure* f) { | |
687 active_handles()->oops_do(f); | |
688 // Do oop for ThreadShadow | |
689 f->do_oop((oop*)&_pending_exception); | |
690 handle_area()->oops_do(f); | |
691 } | |
692 | |
693 void Thread::nmethods_do() { | |
694 } | |
695 | |
696 void Thread::print_on(outputStream* st) const { | |
697 // get_priority assumes osthread initialized | |
698 if (osthread() != NULL) { | |
699 st->print("prio=%d tid=" INTPTR_FORMAT " ", get_priority(this), this); | |
700 osthread()->print_on(st); | |
701 } | |
702 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
703 } | |
704 | |
705 // Thread::print_on_error() is called by fatal error handler. Don't use | |
706 // any lock or allocate memory. | |
707 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
708 if (is_VM_thread()) st->print("VMThread"); | |
709 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
710 else if (is_Java_thread()) st->print("JavaThread"); | |
711 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
712 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
713 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
714 else st->print("Thread"); | |
715 | |
716 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
717 _stack_base - _stack_size, _stack_base); | |
718 | |
719 if (osthread()) { | |
720 st->print(" [id=%d]", osthread()->thread_id()); | |
721 } | |
722 } | |
723 | |
724 #ifdef ASSERT | |
725 void Thread::print_owned_locks_on(outputStream* st) const { | |
726 Monitor *cur = _owned_locks; | |
727 if (cur == NULL) { | |
728 st->print(" (no locks) "); | |
729 } else { | |
730 st->print_cr(" Locks owned:"); | |
731 while(cur) { | |
732 cur->print_on(st); | |
733 cur = cur->next(); | |
734 } | |
735 } | |
736 } | |
737 | |
738 static int ref_use_count = 0; | |
739 | |
740 bool Thread::owns_locks_but_compiled_lock() const { | |
741 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
742 if (cur != Compile_lock) return true; | |
743 } | |
744 return false; | |
745 } | |
746 | |
747 | |
748 #endif | |
749 | |
750 #ifndef PRODUCT | |
751 | |
752 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
753 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
754 // no threads which allow_vm_block's are held | |
755 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
756 // Check if current thread is allowed to block at a safepoint | |
757 if (!(_allow_safepoint_count == 0)) | |
758 fatal("Possible safepoint reached by thread that does not allow it"); | |
759 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
760 fatal("LEAF method calling lock?"); | |
761 } | |
762 | |
763 #ifdef ASSERT | |
764 if (potential_vm_operation && is_Java_thread() | |
765 && !Universe::is_bootstrapping()) { | |
766 // Make sure we do not hold any locks that the VM thread also uses. | |
767 // This could potentially lead to deadlocks | |
768 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
769 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
770 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
771 // since it is used to transfer control between JavaThreads and the VMThread | |
772 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
773 if ( (cur->allow_vm_block() && | |
774 cur != Threads_lock && | |
775 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
776 cur != VMOperationRequest_lock && | |
777 cur != VMOperationQueue_lock) || | |
778 cur->rank() == Mutex::special) { | |
779 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
780 } | |
781 } | |
782 } | |
783 | |
784 if (GCALotAtAllSafepoints) { | |
785 // We could enter a safepoint here and thus have a gc | |
786 InterfaceSupport::check_gc_alot(); | |
787 } | |
788 | |
789 #endif | |
790 } | |
791 #endif | |
792 | |
793 bool Thread::lock_is_in_stack(address adr) const { | |
794 assert(Thread::current() == this, "lock_is_in_stack can only be called from current thread"); | |
795 // High limit: highest_lock is set during thread execution | |
796 // Low limit: address of the local variable dummy, rounded to 4K boundary. | |
797 // (The rounding helps finding threads in unsafe mode, even if the particular stack | |
798 // frame has been popped already. Correct as long as stacks are at least 4K long and aligned.) | |
799 address end = os::current_stack_pointer(); | |
800 if (_highest_lock >= adr && adr >= end) return true; | |
801 | |
802 return false; | |
803 } | |
804 | |
805 | |
806 bool Thread::is_in_stack(address adr) const { | |
807 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
808 address end = os::current_stack_pointer(); | |
809 if (stack_base() >= adr && adr >= end) return true; | |
810 | |
811 return false; | |
812 } | |
813 | |
814 | |
815 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
816 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
817 // used for compilation in the future. If that change is made, the need for these methods | |
818 // should be revisited, and they should be removed if possible. | |
819 | |
820 bool Thread::is_lock_owned(address adr) const { | |
821 if (lock_is_in_stack(adr) ) return true; | |
822 return false; | |
823 } | |
824 | |
825 bool Thread::set_as_starting_thread() { | |
826 // NOTE: this must be called inside the main thread. | |
827 return os::create_main_thread((JavaThread*)this); | |
828 } | |
829 | |
830 static void initialize_class(symbolHandle class_name, TRAPS) { | |
831 klassOop klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); | |
832 instanceKlass::cast(klass)->initialize(CHECK); | |
833 } | |
834 | |
835 | |
836 // Creates the initial ThreadGroup | |
837 static Handle create_initial_thread_group(TRAPS) { | |
838 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_ThreadGroup(), true, CHECK_NH); | |
839 instanceKlassHandle klass (THREAD, k); | |
840 | |
841 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
842 { | |
843 JavaValue result(T_VOID); | |
844 JavaCalls::call_special(&result, | |
845 system_instance, | |
846 klass, | |
847 vmSymbolHandles::object_initializer_name(), | |
848 vmSymbolHandles::void_method_signature(), | |
849 CHECK_NH); | |
850 } | |
851 Universe::set_system_thread_group(system_instance()); | |
852 | |
853 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
854 { | |
855 JavaValue result(T_VOID); | |
856 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
857 JavaCalls::call_special(&result, | |
858 main_instance, | |
859 klass, | |
860 vmSymbolHandles::object_initializer_name(), | |
861 vmSymbolHandles::threadgroup_string_void_signature(), | |
862 system_instance, | |
863 string, | |
864 CHECK_NH); | |
865 } | |
866 return main_instance; | |
867 } | |
868 | |
869 // Creates the initial Thread | |
870 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
871 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_Thread(), true, CHECK_NULL); | |
872 instanceKlassHandle klass (THREAD, k); | |
873 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
874 | |
875 java_lang_Thread::set_thread(thread_oop(), thread); | |
876 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
877 thread->set_threadObj(thread_oop()); | |
878 | |
879 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
880 | |
881 JavaValue result(T_VOID); | |
882 JavaCalls::call_special(&result, thread_oop, | |
883 klass, | |
884 vmSymbolHandles::object_initializer_name(), | |
885 vmSymbolHandles::threadgroup_string_void_signature(), | |
886 thread_group, | |
887 string, | |
888 CHECK_NULL); | |
889 return thread_oop(); | |
890 } | |
891 | |
892 static void call_initializeSystemClass(TRAPS) { | |
893 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_System(), true, CHECK); | |
894 instanceKlassHandle klass (THREAD, k); | |
895 | |
896 JavaValue result(T_VOID); | |
897 JavaCalls::call_static(&result, klass, vmSymbolHandles::initializeSystemClass_name(), | |
898 vmSymbolHandles::void_method_signature(), CHECK); | |
899 } | |
900 | |
901 static void reset_vm_info_property(TRAPS) { | |
902 // the vm info string | |
903 ResourceMark rm(THREAD); | |
904 const char *vm_info = VM_Version::vm_info_string(); | |
905 | |
906 // java.lang.System class | |
907 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_System(), true, CHECK); | |
908 instanceKlassHandle klass (THREAD, k); | |
909 | |
910 // setProperty arguments | |
911 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
912 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
913 | |
914 // return value | |
915 JavaValue r(T_OBJECT); | |
916 | |
917 // public static String setProperty(String key, String value); | |
918 JavaCalls::call_static(&r, | |
919 klass, | |
920 vmSymbolHandles::setProperty_name(), | |
921 vmSymbolHandles::string_string_string_signature(), | |
922 key_str, | |
923 value_str, | |
924 CHECK); | |
925 } | |
926 | |
927 | |
928 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
929 assert(thread_group.not_null(), "thread group should be specified"); | |
930 assert(threadObj() == NULL, "should only create Java thread object once"); | |
931 | |
932 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_Thread(), true, CHECK); | |
933 instanceKlassHandle klass (THREAD, k); | |
934 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
935 | |
936 java_lang_Thread::set_thread(thread_oop(), this); | |
937 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
938 set_threadObj(thread_oop()); | |
939 | |
940 JavaValue result(T_VOID); | |
941 if (thread_name != NULL) { | |
942 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
943 // Thread gets assigned specified name and null target | |
944 JavaCalls::call_special(&result, | |
945 thread_oop, | |
946 klass, | |
947 vmSymbolHandles::object_initializer_name(), | |
948 vmSymbolHandles::threadgroup_string_void_signature(), | |
949 thread_group, // Argument 1 | |
950 name, // Argument 2 | |
951 THREAD); | |
952 } else { | |
953 // Thread gets assigned name "Thread-nnn" and null target | |
954 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
955 JavaCalls::call_special(&result, | |
956 thread_oop, | |
957 klass, | |
958 vmSymbolHandles::object_initializer_name(), | |
959 vmSymbolHandles::threadgroup_runnable_void_signature(), | |
960 thread_group, // Argument 1 | |
961 Handle(), // Argument 2 | |
962 THREAD); | |
963 } | |
964 | |
965 | |
966 if (daemon) { | |
967 java_lang_Thread::set_daemon(thread_oop()); | |
968 } | |
969 | |
970 if (HAS_PENDING_EXCEPTION) { | |
971 return; | |
972 } | |
973 | |
974 KlassHandle group(this, SystemDictionary::threadGroup_klass()); | |
975 Handle threadObj(this, this->threadObj()); | |
976 | |
977 JavaCalls::call_special(&result, | |
978 thread_group, | |
979 group, | |
980 vmSymbolHandles::add_method_name(), | |
981 vmSymbolHandles::thread_void_signature(), | |
982 threadObj, // Arg 1 | |
983 THREAD); | |
984 | |
985 | |
986 } | |
987 | |
988 // NamedThread -- non-JavaThread subclasses with multiple | |
989 // uniquely named instances should derive from this. | |
990 NamedThread::NamedThread() : Thread() { | |
991 _name = NULL; | |
992 } | |
993 | |
994 NamedThread::~NamedThread() { | |
995 if (_name != NULL) { | |
996 FREE_C_HEAP_ARRAY(char, _name); | |
997 _name = NULL; | |
998 } | |
999 } | |
1000 | |
1001 void NamedThread::set_name(const char* format, ...) { | |
1002 guarantee(_name == NULL, "Only get to set name once."); | |
1003 _name = NEW_C_HEAP_ARRAY(char, max_name_len); | |
1004 guarantee(_name != NULL, "alloc failure"); | |
1005 va_list ap; | |
1006 va_start(ap, format); | |
1007 jio_vsnprintf(_name, max_name_len, format, ap); | |
1008 va_end(ap); | |
1009 } | |
1010 | |
1011 // ======= WatcherThread ======== | |
1012 | |
1013 // The watcher thread exists to simulate timer interrupts. It should | |
1014 // be replaced by an abstraction over whatever native support for | |
1015 // timer interrupts exists on the platform. | |
1016 | |
1017 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
1018 bool WatcherThread::_should_terminate = false; | |
1019 | |
1020 WatcherThread::WatcherThread() : Thread() { | |
1021 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
1022 if (os::create_thread(this, os::watcher_thread)) { | |
1023 _watcher_thread = this; | |
1024 | |
1025 // Set the watcher thread to the highest OS priority which should not be | |
1026 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
1027 // is created. The only normal thread using this priority is the reference | |
1028 // handler thread, which runs for very short intervals only. | |
1029 // If the VMThread's priority is not lower than the WatcherThread profiling | |
1030 // will be inaccurate. | |
1031 os::set_priority(this, MaxPriority); | |
1032 if (!DisableStartThread) { | |
1033 os::start_thread(this); | |
1034 } | |
1035 } | |
1036 } | |
1037 | |
1038 void WatcherThread::run() { | |
1039 assert(this == watcher_thread(), "just checking"); | |
1040 | |
1041 this->record_stack_base_and_size(); | |
1042 this->initialize_thread_local_storage(); | |
1043 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1044 while(!_should_terminate) { | |
1045 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
1046 assert(watcher_thread() == this, "thread consistency check"); | |
1047 | |
1048 // Calculate how long it'll be until the next PeriodicTask work | |
1049 // should be done, and sleep that amount of time. | |
1050 const size_t time_to_wait = PeriodicTask::time_to_wait(); | |
1051 os::sleep(this, time_to_wait, false); | |
1052 | |
1053 if (is_error_reported()) { | |
1054 // A fatal error has happened, the error handler(VMError::report_and_die) | |
1055 // should abort JVM after creating an error log file. However in some | |
1056 // rare cases, the error handler itself might deadlock. Here we try to | |
1057 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
1058 // | |
1059 // This code is in WatcherThread because WatcherThread wakes up | |
1060 // periodically so the fatal error handler doesn't need to do anything; | |
1061 // also because the WatcherThread is less likely to crash than other | |
1062 // threads. | |
1063 | |
1064 for (;;) { | |
1065 if (!ShowMessageBoxOnError | |
1066 && (OnError == NULL || OnError[0] == '\0') | |
1067 && Arguments::abort_hook() == NULL) { | |
1068 os::sleep(this, 2 * 60 * 1000, false); | |
1069 fdStream err(defaultStream::output_fd()); | |
1070 err.print_raw_cr("# [ timer expired, abort... ]"); | |
1071 // skip atexit/vm_exit/vm_abort hooks | |
1072 os::die(); | |
1073 } | |
1074 | |
1075 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
1076 // ShowMessageBoxOnError when it is ready to abort. | |
1077 os::sleep(this, 5 * 1000, false); | |
1078 } | |
1079 } | |
1080 | |
1081 PeriodicTask::real_time_tick(time_to_wait); | |
1082 | |
1083 // If we have no more tasks left due to dynamic disenrollment, | |
1084 // shut down the thread since we don't currently support dynamic enrollment | |
1085 if (PeriodicTask::num_tasks() == 0) { | |
1086 _should_terminate = true; | |
1087 } | |
1088 } | |
1089 | |
1090 // Signal that it is terminated | |
1091 { | |
1092 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
1093 _watcher_thread = NULL; | |
1094 Terminator_lock->notify(); | |
1095 } | |
1096 | |
1097 // Thread destructor usually does this.. | |
1098 ThreadLocalStorage::set_thread(NULL); | |
1099 } | |
1100 | |
1101 void WatcherThread::start() { | |
1102 if (watcher_thread() == NULL) { | |
1103 _should_terminate = false; | |
1104 // Create the single instance of WatcherThread | |
1105 new WatcherThread(); | |
1106 } | |
1107 } | |
1108 | |
1109 void WatcherThread::stop() { | |
1110 // it is ok to take late safepoints here, if needed | |
1111 MutexLocker mu(Terminator_lock); | |
1112 _should_terminate = true; | |
1113 while(watcher_thread() != NULL) { | |
1114 // This wait should make safepoint checks, wait without a timeout, | |
1115 // and wait as a suspend-equivalent condition. | |
1116 // | |
1117 // Note: If the FlatProfiler is running, then this thread is waiting | |
1118 // for the WatcherThread to terminate and the WatcherThread, via the | |
1119 // FlatProfiler task, is waiting for the external suspend request on | |
1120 // this thread to complete. wait_for_ext_suspend_completion() will | |
1121 // eventually timeout, but that takes time. Making this wait a | |
1122 // suspend-equivalent condition solves that timeout problem. | |
1123 // | |
1124 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
1125 Mutex::_as_suspend_equivalent_flag); | |
1126 } | |
1127 } | |
1128 | |
1129 void WatcherThread::print_on(outputStream* st) const { | |
1130 st->print("\"%s\" ", name()); | |
1131 Thread::print_on(st); | |
1132 st->cr(); | |
1133 } | |
1134 | |
1135 // ======= JavaThread ======== | |
1136 | |
1137 // A JavaThread is a normal Java thread | |
1138 | |
1139 void JavaThread::initialize() { | |
1140 // Initialize fields | |
342
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1142 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1143 set_claimed_par_id(-1); |
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1144 |
0 | 1145 set_saved_exception_pc(NULL); |
1146 set_threadObj(NULL); | |
1147 _anchor.clear(); | |
1148 set_entry_point(NULL); | |
1149 set_jni_functions(jni_functions()); | |
1150 set_callee_target(NULL); | |
1151 set_vm_result(NULL); | |
1152 set_vm_result_2(NULL); | |
1153 set_vframe_array_head(NULL); | |
1154 set_vframe_array_last(NULL); | |
1155 set_deferred_locals(NULL); | |
1156 set_deopt_mark(NULL); | |
1157 clear_must_deopt_id(); | |
1158 set_monitor_chunks(NULL); | |
1159 set_next(NULL); | |
1160 set_thread_state(_thread_new); | |
1161 _terminated = _not_terminated; | |
1162 _privileged_stack_top = NULL; | |
1163 _array_for_gc = NULL; | |
1164 _suspend_equivalent = false; | |
1165 _in_deopt_handler = 0; | |
1166 _doing_unsafe_access = false; | |
1167 _stack_guard_state = stack_guard_unused; | |
1168 _exception_oop = NULL; | |
1169 _exception_pc = 0; | |
1170 _exception_handler_pc = 0; | |
1171 _exception_stack_size = 0; | |
1172 _jvmti_thread_state= NULL; | |
1173 _jvmti_get_loaded_classes_closure = NULL; | |
1174 _interp_only_mode = 0; | |
1175 _special_runtime_exit_condition = _no_async_condition; | |
1176 _pending_async_exception = NULL; | |
1177 _is_compiling = false; | |
1178 _thread_stat = NULL; | |
1179 _thread_stat = new ThreadStatistics(); | |
1180 _blocked_on_compilation = false; | |
1181 _jni_active_critical = 0; | |
1182 _do_not_unlock_if_synchronized = false; | |
1183 _cached_monitor_info = NULL; | |
1184 _parker = Parker::Allocate(this) ; | |
1185 | |
1186 #ifndef PRODUCT | |
1187 _jmp_ring_index = 0; | |
1188 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
1189 record_jump(NULL, NULL, NULL, 0); | |
1190 } | |
1191 #endif /* PRODUCT */ | |
1192 | |
1193 set_thread_profiler(NULL); | |
1194 if (FlatProfiler::is_active()) { | |
1195 // This is where we would decide to either give each thread it's own profiler | |
1196 // or use one global one from FlatProfiler, | |
1197 // or up to some count of the number of profiled threads, etc. | |
1198 ThreadProfiler* pp = new ThreadProfiler(); | |
1199 pp->engage(); | |
1200 set_thread_profiler(pp); | |
1201 } | |
1202 | |
1203 // Setup safepoint state info for this thread | |
1204 ThreadSafepointState::create(this); | |
1205 | |
1206 debug_only(_java_call_counter = 0); | |
1207 | |
1208 // JVMTI PopFrame support | |
1209 _popframe_condition = popframe_inactive; | |
1210 _popframe_preserved_args = NULL; | |
1211 _popframe_preserved_args_size = 0; | |
1212 | |
1213 pd_initialize(); | |
1214 } | |
1215 | |
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1216 #ifndef SERIALGC |
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1217 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1218 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1219 #endif // !SERIALGC |
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1220 |
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1221 JavaThread::JavaThread(bool is_attaching) : |
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1222 Thread() |
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1223 #ifndef SERIALGC |
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1224 , _satb_mark_queue(&_satb_mark_queue_set), |
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1225 _dirty_card_queue(&_dirty_card_queue_set) |
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1226 #endif // !SERIALGC |
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1227 { |
0 | 1228 initialize(); |
1229 _is_attaching = is_attaching; | |
1230 } | |
1231 | |
1232 bool JavaThread::reguard_stack(address cur_sp) { | |
1233 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
1234 return true; // Stack already guarded or guard pages not needed. | |
1235 } | |
1236 | |
1237 if (register_stack_overflow()) { | |
1238 // For those architectures which have separate register and | |
1239 // memory stacks, we must check the register stack to see if | |
1240 // it has overflowed. | |
1241 return false; | |
1242 } | |
1243 | |
1244 // Java code never executes within the yellow zone: the latter is only | |
1245 // there to provoke an exception during stack banging. If java code | |
1246 // is executing there, either StackShadowPages should be larger, or | |
1247 // some exception code in c1, c2 or the interpreter isn't unwinding | |
1248 // when it should. | |
1249 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
1250 | |
1251 enable_stack_yellow_zone(); | |
1252 return true; | |
1253 } | |
1254 | |
1255 bool JavaThread::reguard_stack(void) { | |
1256 return reguard_stack(os::current_stack_pointer()); | |
1257 } | |
1258 | |
1259 | |
1260 void JavaThread::block_if_vm_exited() { | |
1261 if (_terminated == _vm_exited) { | |
1262 // _vm_exited is set at safepoint, and Threads_lock is never released | |
1263 // we will block here forever | |
1264 Threads_lock->lock_without_safepoint_check(); | |
1265 ShouldNotReachHere(); | |
1266 } | |
1267 } | |
1268 | |
1269 | |
1270 // Remove this ifdef when C1 is ported to the compiler interface. | |
1271 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
1272 | |
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1273 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1274 Thread() |
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1275 #ifndef SERIALGC |
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1276 , _satb_mark_queue(&_satb_mark_queue_set), |
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1277 _dirty_card_queue(&_dirty_card_queue_set) |
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1278 #endif // !SERIALGC |
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1279 { |
0 | 1280 if (TraceThreadEvents) { |
1281 tty->print_cr("creating thread %p", this); | |
1282 } | |
1283 initialize(); | |
1284 _is_attaching = false; | |
1285 set_entry_point(entry_point); | |
1286 // Create the native thread itself. | |
1287 // %note runtime_23 | |
1288 os::ThreadType thr_type = os::java_thread; | |
1289 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
1290 os::java_thread; | |
1291 os::create_thread(this, thr_type, stack_sz); | |
1292 | |
1293 // The _osthread may be NULL here because we ran out of memory (too many threads active). | |
1294 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
1295 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
1296 // the exception consists of creating the exception object & initializing it, initialization | |
1297 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
1298 // | |
1299 // The thread is still suspended when we reach here. Thread must be explicit started | |
1300 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
1301 // by calling Threads:add. The reason why this is not done here, is because the thread | |
1302 // object must be fully initialized (take a look at JVM_Start) | |
1303 } | |
1304 | |
1305 JavaThread::~JavaThread() { | |
1306 if (TraceThreadEvents) { | |
1307 tty->print_cr("terminate thread %p", this); | |
1308 } | |
1309 | |
1310 // JSR166 -- return the parker to the free list | |
1311 Parker::Release(_parker); | |
1312 _parker = NULL ; | |
1313 | |
1314 // Free any remaining previous UnrollBlock | |
1315 vframeArray* old_array = vframe_array_last(); | |
1316 | |
1317 if (old_array != NULL) { | |
1318 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
1319 old_array->set_unroll_block(NULL); | |
1320 delete old_info; | |
1321 delete old_array; | |
1322 } | |
1323 | |
1324 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
1325 if (deferred != NULL) { | |
1326 // This can only happen if thread is destroyed before deoptimization occurs. | |
1327 assert(deferred->length() != 0, "empty array!"); | |
1328 do { | |
1329 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
1330 deferred->remove_at(0); | |
1331 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
1332 delete dlv; | |
1333 } while (deferred->length() != 0); | |
1334 delete deferred; | |
1335 } | |
1336 | |
1337 // All Java related clean up happens in exit | |
1338 ThreadSafepointState::destroy(this); | |
1339 if (_thread_profiler != NULL) delete _thread_profiler; | |
1340 if (_thread_stat != NULL) delete _thread_stat; | |
1341 } | |
1342 | |
1343 | |
1344 // The first routine called by a new Java thread | |
1345 void JavaThread::run() { | |
1346 // initialize thread-local alloc buffer related fields | |
1347 this->initialize_tlab(); | |
1348 | |
1349 // used to test validitity of stack trace backs | |
1350 this->record_base_of_stack_pointer(); | |
1351 | |
1352 // Record real stack base and size. | |
1353 this->record_stack_base_and_size(); | |
1354 | |
1355 // Initialize thread local storage; set before calling MutexLocker | |
1356 this->initialize_thread_local_storage(); | |
1357 | |
1358 this->create_stack_guard_pages(); | |
1359 | |
1360 // Thread is now sufficient initialized to be handled by the safepoint code as being | |
1361 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
1362 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
1363 | |
1364 assert(JavaThread::current() == this, "sanity check"); | |
1365 assert(!Thread::current()->owns_locks(), "sanity check"); | |
1366 | |
1367 DTRACE_THREAD_PROBE(start, this); | |
1368 | |
1369 // This operation might block. We call that after all safepoint checks for a new thread has | |
1370 // been completed. | |
1371 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1372 | |
1373 if (JvmtiExport::should_post_thread_life()) { | |
1374 JvmtiExport::post_thread_start(this); | |
1375 } | |
1376 | |
1377 // We call another function to do the rest so we are sure that the stack addresses used | |
1378 // from there will be lower than the stack base just computed | |
1379 thread_main_inner(); | |
1380 | |
1381 // Note, thread is no longer valid at this point! | |
1382 } | |
1383 | |
1384 | |
1385 void JavaThread::thread_main_inner() { | |
1386 assert(JavaThread::current() == this, "sanity check"); | |
1387 assert(this->threadObj() != NULL, "just checking"); | |
1388 | |
1389 // Execute thread entry point. If this thread is being asked to restart, | |
1390 // or has been stopped before starting, do not reexecute entry point. | |
1391 // Note: Due to JVM_StopThread we can have pending exceptions already! | |
1392 if (!this->has_pending_exception() && !java_lang_Thread::is_stillborn(this->threadObj())) { | |
1393 // enter the thread's entry point only if we have no pending exceptions | |
1394 HandleMark hm(this); | |
1395 this->entry_point()(this, this); | |
1396 } | |
1397 | |
1398 DTRACE_THREAD_PROBE(stop, this); | |
1399 | |
1400 this->exit(false); | |
1401 delete this; | |
1402 } | |
1403 | |
1404 | |
1405 static void ensure_join(JavaThread* thread) { | |
1406 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
1407 Handle threadObj(thread, thread->threadObj()); | |
1408 assert(threadObj.not_null(), "java thread object must exist"); | |
1409 ObjectLocker lock(threadObj, thread); | |
1410 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1411 thread->clear_pending_exception(); | |
1412 // It is of profound importance that we set the stillborn bit and reset the thread object, | |
1413 // before we do the notify. Since, changing these two variable will make JVM_IsAlive return | |
1414 // false. So in case another thread is doing a join on this thread , it will detect that the thread | |
1415 // is dead when it gets notified. | |
1416 java_lang_Thread::set_stillborn(threadObj()); | |
1417 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
1418 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
1419 java_lang_Thread::set_thread(threadObj(), NULL); | |
1420 lock.notify_all(thread); | |
1421 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1422 thread->clear_pending_exception(); | |
1423 } | |
1424 | |
1425 // For any new cleanup additions, please check to see if they need to be applied to | |
1426 // cleanup_failed_attach_current_thread as well. | |
1427 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
1428 assert(this == JavaThread::current(), "thread consistency check"); | |
1429 if (!InitializeJavaLangSystem) return; | |
1430 | |
1431 HandleMark hm(this); | |
1432 Handle uncaught_exception(this, this->pending_exception()); | |
1433 this->clear_pending_exception(); | |
1434 Handle threadObj(this, this->threadObj()); | |
1435 assert(threadObj.not_null(), "Java thread object should be created"); | |
1436 | |
1437 if (get_thread_profiler() != NULL) { | |
1438 get_thread_profiler()->disengage(); | |
1439 ResourceMark rm; | |
1440 get_thread_profiler()->print(get_thread_name()); | |
1441 } | |
1442 | |
1443 | |
1444 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
1445 { | |
1446 EXCEPTION_MARK; | |
1447 | |
1448 CLEAR_PENDING_EXCEPTION; | |
1449 } | |
1450 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
1451 // has to be fixed by a runtime query method | |
1452 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
1453 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
1454 // java.lang.Thread.dispatchUncaughtException | |
1455 if (uncaught_exception.not_null()) { | |
1456 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
1457 Events::log("uncaught exception INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT", | |
1458 (address)uncaught_exception(), (address)threadObj(), (address)group()); | |
1459 { | |
1460 EXCEPTION_MARK; | |
1461 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
1462 // call it. Otherwise we have an older library without the JSR-166 changes, | |
1463 // so call ThreadGroup.uncaughtException() | |
1464 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
1465 CallInfo callinfo; | |
1466 KlassHandle thread_klass(THREAD, SystemDictionary::thread_klass()); | |
1467 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, | |
1468 vmSymbolHandles::dispatchUncaughtException_name(), | |
1469 vmSymbolHandles::throwable_void_signature(), | |
1470 KlassHandle(), false, false, THREAD); | |
1471 CLEAR_PENDING_EXCEPTION; | |
1472 methodHandle method = callinfo.selected_method(); | |
1473 if (method.not_null()) { | |
1474 JavaValue result(T_VOID); | |
1475 JavaCalls::call_virtual(&result, | |
1476 threadObj, thread_klass, | |
1477 vmSymbolHandles::dispatchUncaughtException_name(), | |
1478 vmSymbolHandles::throwable_void_signature(), | |
1479 uncaught_exception, | |
1480 THREAD); | |
1481 } else { | |
1482 KlassHandle thread_group(THREAD, SystemDictionary::threadGroup_klass()); | |
1483 JavaValue result(T_VOID); | |
1484 JavaCalls::call_virtual(&result, | |
1485 group, thread_group, | |
1486 vmSymbolHandles::uncaughtException_name(), | |
1487 vmSymbolHandles::thread_throwable_void_signature(), | |
1488 threadObj, // Arg 1 | |
1489 uncaught_exception, // Arg 2 | |
1490 THREAD); | |
1491 } | |
1492 CLEAR_PENDING_EXCEPTION; | |
1493 } | |
1494 } | |
1495 | |
1496 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during | |
1497 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
1498 // is deprecated anyhow. | |
1499 { int count = 3; | |
1500 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
1501 EXCEPTION_MARK; | |
1502 JavaValue result(T_VOID); | |
1503 KlassHandle thread_klass(THREAD, SystemDictionary::thread_klass()); | |
1504 JavaCalls::call_virtual(&result, | |
1505 threadObj, thread_klass, | |
1506 vmSymbolHandles::exit_method_name(), | |
1507 vmSymbolHandles::void_method_signature(), | |
1508 THREAD); | |
1509 CLEAR_PENDING_EXCEPTION; | |
1510 } | |
1511 } | |
1512 | |
1513 // notify JVMTI | |
1514 if (JvmtiExport::should_post_thread_life()) { | |
1515 JvmtiExport::post_thread_end(this); | |
1516 } | |
1517 | |
1518 // We have notified the agents that we are exiting, before we go on, | |
1519 // we must check for a pending external suspend request and honor it | |
1520 // in order to not surprise the thread that made the suspend request. | |
1521 while (true) { | |
1522 { | |
1523 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1524 if (!is_external_suspend()) { | |
1525 set_terminated(_thread_exiting); | |
1526 ThreadService::current_thread_exiting(this); | |
1527 break; | |
1528 } | |
1529 // Implied else: | |
1530 // Things get a little tricky here. We have a pending external | |
1531 // suspend request, but we are holding the SR_lock so we | |
1532 // can't just self-suspend. So we temporarily drop the lock | |
1533 // and then self-suspend. | |
1534 } | |
1535 | |
1536 ThreadBlockInVM tbivm(this); | |
1537 java_suspend_self(); | |
1538 | |
1539 // We're done with this suspend request, but we have to loop around | |
1540 // and check again. Eventually we will get SR_lock without a pending | |
1541 // external suspend request and will be able to mark ourselves as | |
1542 // exiting. | |
1543 } | |
1544 // no more external suspends are allowed at this point | |
1545 } else { | |
1546 // before_exit() has already posted JVMTI THREAD_END events | |
1547 } | |
1548 | |
1549 // Notify waiters on thread object. This has to be done after exit() is called | |
1550 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
1551 // group should have the destroyed bit set before waiters are notified). | |
1552 ensure_join(this); | |
1553 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
1554 | |
1555 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
1556 // held by this thread must be released. A detach operation must only | |
1557 // get here if there are no Java frames on the stack. Therefore, any | |
1558 // owned monitors at this point MUST be JNI-acquired monitors which are | |
1559 // pre-inflated and in the monitor cache. | |
1560 // | |
1561 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
1562 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
1563 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
1564 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
1565 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
1566 } | |
1567 | |
1568 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
1569 // is in a consistent state, in case GC happens | |
1570 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
1571 | |
1572 if (active_handles() != NULL) { | |
1573 JNIHandleBlock* block = active_handles(); | |
1574 set_active_handles(NULL); | |
1575 JNIHandleBlock::release_block(block); | |
1576 } | |
1577 | |
1578 if (free_handle_block() != NULL) { | |
1579 JNIHandleBlock* block = free_handle_block(); | |
1580 set_free_handle_block(NULL); | |
1581 JNIHandleBlock::release_block(block); | |
1582 } | |
1583 | |
1584 // These have to be removed while this is still a valid thread. | |
1585 remove_stack_guard_pages(); | |
1586 | |
1587 if (UseTLAB) { | |
1588 tlab().make_parsable(true); // retire TLAB | |
1589 } | |
1590 | |
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1591 if (jvmti_thread_state() != NULL) { |
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1592 JvmtiExport::cleanup_thread(this); |
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1593 } |
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1594 |
0 | 1595 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
1596 Threads::remove(this); | |
1597 } | |
1598 | |
1599 void JavaThread::cleanup_failed_attach_current_thread() { | |
1600 | |
1601 if (get_thread_profiler() != NULL) { | |
1602 get_thread_profiler()->disengage(); | |
1603 ResourceMark rm; | |
1604 get_thread_profiler()->print(get_thread_name()); | |
1605 } | |
1606 | |
1607 if (active_handles() != NULL) { | |
1608 JNIHandleBlock* block = active_handles(); | |
1609 set_active_handles(NULL); | |
1610 JNIHandleBlock::release_block(block); | |
1611 } | |
1612 | |
1613 if (free_handle_block() != NULL) { | |
1614 JNIHandleBlock* block = free_handle_block(); | |
1615 set_free_handle_block(NULL); | |
1616 JNIHandleBlock::release_block(block); | |
1617 } | |
1618 | |
1619 if (UseTLAB) { | |
1620 tlab().make_parsable(true); // retire TLAB, if any | |
1621 } | |
1622 | |
1623 Threads::remove(this); | |
1624 delete this; | |
1625 } | |
1626 | |
1627 | |
1628 JavaThread* JavaThread::active() { | |
1629 Thread* thread = ThreadLocalStorage::thread(); | |
1630 assert(thread != NULL, "just checking"); | |
1631 if (thread->is_Java_thread()) { | |
1632 return (JavaThread*) thread; | |
1633 } else { | |
1634 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
1635 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
1636 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
1637 assert(ret->is_Java_thread(), "must be a Java thread"); | |
1638 return ret; | |
1639 } | |
1640 } | |
1641 | |
1642 bool JavaThread::is_lock_owned(address adr) const { | |
1643 if (lock_is_in_stack(adr)) return true; | |
1644 | |
1645 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
1646 if (chunk->contains(adr)) return true; | |
1647 } | |
1648 | |
1649 return false; | |
1650 } | |
1651 | |
1652 | |
1653 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
1654 chunk->set_next(monitor_chunks()); | |
1655 set_monitor_chunks(chunk); | |
1656 } | |
1657 | |
1658 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
1659 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
1660 if (monitor_chunks() == chunk) { | |
1661 set_monitor_chunks(chunk->next()); | |
1662 } else { | |
1663 MonitorChunk* prev = monitor_chunks(); | |
1664 while (prev->next() != chunk) prev = prev->next(); | |
1665 prev->set_next(chunk->next()); | |
1666 } | |
1667 } | |
1668 | |
1669 // JVM support. | |
1670 | |
1671 // Note: this function shouldn't block if it's called in | |
1672 // _thread_in_native_trans state (such as from | |
1673 // check_special_condition_for_native_trans()). | |
1674 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
1675 | |
1676 if (has_last_Java_frame() && has_async_condition()) { | |
1677 // If we are at a polling page safepoint (not a poll return) | |
1678 // then we must defer async exception because live registers | |
1679 // will be clobbered by the exception path. Poll return is | |
1680 // ok because the call we a returning from already collides | |
1681 // with exception handling registers and so there is no issue. | |
1682 // (The exception handling path kills call result registers but | |
1683 // this is ok since the exception kills the result anyway). | |
1684 | |
1685 if (is_at_poll_safepoint()) { | |
1686 // if the code we are returning to has deoptimized we must defer | |
1687 // the exception otherwise live registers get clobbered on the | |
1688 // exception path before deoptimization is able to retrieve them. | |
1689 // | |
1690 RegisterMap map(this, false); | |
1691 frame caller_fr = last_frame().sender(&map); | |
1692 assert(caller_fr.is_compiled_frame(), "what?"); | |
1693 if (caller_fr.is_deoptimized_frame()) { | |
1694 if (TraceExceptions) { | |
1695 ResourceMark rm; | |
1696 tty->print_cr("deferred async exception at compiled safepoint"); | |
1697 } | |
1698 return; | |
1699 } | |
1700 } | |
1701 } | |
1702 | |
1703 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
1704 if (condition == _no_async_condition) { | |
1705 // Conditions have changed since has_special_runtime_exit_condition() | |
1706 // was called: | |
1707 // - if we were here only because of an external suspend request, | |
1708 // then that was taken care of above (or cancelled) so we are done | |
1709 // - if we were here because of another async request, then it has | |
1710 // been cleared between the has_special_runtime_exit_condition() | |
1711 // and now so again we are done | |
1712 return; | |
1713 } | |
1714 | |
1715 // Check for pending async. exception | |
1716 if (_pending_async_exception != NULL) { | |
1717 // Only overwrite an already pending exception, if it is not a threadDeath. | |
1718 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::threaddeath_klass())) { | |
1719 | |
1720 // We cannot call Exceptions::_throw(...) here because we cannot block | |
1721 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
1722 | |
1723 if (TraceExceptions) { | |
1724 ResourceMark rm; | |
1725 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
1726 if (has_last_Java_frame() ) { | |
1727 frame f = last_frame(); | |
1728 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
1729 } | |
1730 tty->print_cr(" of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
1731 } | |
1732 _pending_async_exception = NULL; | |
1733 clear_has_async_exception(); | |
1734 } | |
1735 } | |
1736 | |
1737 if (check_unsafe_error && | |
1738 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
1739 condition = _no_async_condition; // done | |
1740 switch (thread_state()) { | |
1741 case _thread_in_vm: | |
1742 { | |
1743 JavaThread* THREAD = this; | |
1744 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
1745 } | |
1746 case _thread_in_native: | |
1747 { | |
1748 ThreadInVMfromNative tiv(this); | |
1749 JavaThread* THREAD = this; | |
1750 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
1751 } | |
1752 case _thread_in_Java: | |
1753 { | |
1754 ThreadInVMfromJava tiv(this); | |
1755 JavaThread* THREAD = this; | |
1756 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
1757 } | |
1758 default: | |
1759 ShouldNotReachHere(); | |
1760 } | |
1761 } | |
1762 | |
1763 assert(condition == _no_async_condition || has_pending_exception() || | |
1764 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
1765 "must have handled the async condition, if no exception"); | |
1766 } | |
1767 | |
1768 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
1769 // | |
1770 // Check for pending external suspend. Internal suspend requests do | |
1771 // not use handle_special_runtime_exit_condition(). | |
1772 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
1773 // thread is not the current thread. In older versions of jdbx, jdbx | |
1774 // threads could call into the VM with another thread's JNIEnv so we | |
1775 // can be here operating on behalf of a suspended thread (4432884). | |
1776 bool do_self_suspend = is_external_suspend_with_lock(); | |
1777 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
1778 // | |
1779 // Because thread is external suspended the safepoint code will count | |
1780 // thread as at a safepoint. This can be odd because we can be here | |
1781 // as _thread_in_Java which would normally transition to _thread_blocked | |
1782 // at a safepoint. We would like to mark the thread as _thread_blocked | |
1783 // before calling java_suspend_self like all other callers of it but | |
1784 // we must then observe proper safepoint protocol. (We can't leave | |
1785 // _thread_blocked with a safepoint in progress). However we can be | |
1786 // here as _thread_in_native_trans so we can't use a normal transition | |
1787 // constructor/destructor pair because they assert on that type of | |
1788 // transition. We could do something like: | |
1789 // | |
1790 // JavaThreadState state = thread_state(); | |
1791 // set_thread_state(_thread_in_vm); | |
1792 // { | |
1793 // ThreadBlockInVM tbivm(this); | |
1794 // java_suspend_self() | |
1795 // } | |
1796 // set_thread_state(_thread_in_vm_trans); | |
1797 // if (safepoint) block; | |
1798 // set_thread_state(state); | |
1799 // | |
1800 // but that is pretty messy. Instead we just go with the way the | |
1801 // code has worked before and note that this is the only path to | |
1802 // java_suspend_self that doesn't put the thread in _thread_blocked | |
1803 // mode. | |
1804 | |
1805 frame_anchor()->make_walkable(this); | |
1806 java_suspend_self(); | |
1807 | |
1808 // We might be here for reasons in addition to the self-suspend request | |
1809 // so check for other async requests. | |
1810 } | |
1811 | |
1812 if (check_asyncs) { | |
1813 check_and_handle_async_exceptions(); | |
1814 } | |
1815 } | |
1816 | |
1817 void JavaThread::send_thread_stop(oop java_throwable) { | |
1818 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
1819 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
1820 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
1821 | |
1822 // Do not throw asynchronous exceptions against the compiler thread | |
1823 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
1824 if (is_Compiler_thread()) return; | |
1825 | |
1826 // This is a change from JDK 1.1, but JDK 1.2 will also do it: | |
1827 if (java_throwable->is_a(SystemDictionary::threaddeath_klass())) { | |
1828 java_lang_Thread::set_stillborn(threadObj()); | |
1829 } | |
1830 | |
1831 { | |
1832 // Actually throw the Throwable against the target Thread - however | |
1833 // only if there is no thread death exception installed already. | |
1834 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::threaddeath_klass())) { | |
1835 // If the topmost frame is a runtime stub, then we are calling into | |
1836 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
1837 // must deoptimize the caller before continuing, as the compiled exception handler table | |
1838 // may not be valid | |
1839 if (has_last_Java_frame()) { | |
1840 frame f = last_frame(); | |
1841 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
1842 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
1843 RegisterMap reg_map(this, UseBiasedLocking); | |
1844 frame compiled_frame = f.sender(®_map); | |
1845 if (compiled_frame.can_be_deoptimized()) { | |
1846 Deoptimization::deoptimize(this, compiled_frame, ®_map); | |
1847 } | |
1848 } | |
1849 } | |
1850 | |
1851 // Set async. pending exception in thread. | |
1852 set_pending_async_exception(java_throwable); | |
1853 | |
1854 if (TraceExceptions) { | |
1855 ResourceMark rm; | |
1856 tty->print_cr("Pending Async. exception installed of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
1857 } | |
1858 // for AbortVMOnException flag | |
1859 NOT_PRODUCT(Exceptions::debug_check_abort(instanceKlass::cast(_pending_async_exception->klass())->external_name())); | |
1860 } | |
1861 } | |
1862 | |
1863 | |
1864 // Interrupt thread so it will wake up from a potential wait() | |
1865 Thread::interrupt(this); | |
1866 } | |
1867 | |
1868 // External suspension mechanism. | |
1869 // | |
1870 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
1871 // to any VM_locks and it is at a transition | |
1872 // Self-suspension will happen on the transition out of the vm. | |
1873 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
1874 // | |
1875 // Guarantees on return: | |
1876 // + Target thread will not execute any new bytecode (that's why we need to | |
1877 // force a safepoint) | |
1878 // + Target thread will not enter any new monitors | |
1879 // | |
1880 void JavaThread::java_suspend() { | |
1881 { MutexLocker mu(Threads_lock); | |
1882 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
1883 return; | |
1884 } | |
1885 } | |
1886 | |
1887 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1888 if (!is_external_suspend()) { | |
1889 // a racing resume has cancelled us; bail out now | |
1890 return; | |
1891 } | |
1892 | |
1893 // suspend is done | |
1894 uint32_t debug_bits = 0; | |
1895 // Warning: is_ext_suspend_completed() may temporarily drop the | |
1896 // SR_lock to allow the thread to reach a stable thread state if | |
1897 // it is currently in a transient thread state. | |
1898 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
1899 SuspendRetryDelay, &debug_bits) ) { | |
1900 return; | |
1901 } | |
1902 } | |
1903 | |
1904 VM_ForceSafepoint vm_suspend; | |
1905 VMThread::execute(&vm_suspend); | |
1906 } | |
1907 | |
1908 // Part II of external suspension. | |
1909 // A JavaThread self suspends when it detects a pending external suspend | |
1910 // request. This is usually on transitions. It is also done in places | |
1911 // where continuing to the next transition would surprise the caller, | |
1912 // e.g., monitor entry. | |
1913 // | |
1914 // Returns the number of times that the thread self-suspended. | |
1915 // | |
1916 // Note: DO NOT call java_suspend_self() when you just want to block current | |
1917 // thread. java_suspend_self() is the second stage of cooperative | |
1918 // suspension for external suspend requests and should only be used | |
1919 // to complete an external suspend request. | |
1920 // | |
1921 int JavaThread::java_suspend_self() { | |
1922 int ret = 0; | |
1923 | |
1924 // we are in the process of exiting so don't suspend | |
1925 if (is_exiting()) { | |
1926 clear_external_suspend(); | |
1927 return ret; | |
1928 } | |
1929 | |
1930 assert(_anchor.walkable() || | |
1931 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
1932 "must have walkable stack"); | |
1933 | |
1934 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1935 | |
1936 assert(!this->is_any_suspended(), | |
1937 "a thread trying to self-suspend should not already be suspended"); | |
1938 | |
1939 if (this->is_suspend_equivalent()) { | |
1940 // If we are self-suspending as a result of the lifting of a | |
1941 // suspend equivalent condition, then the suspend_equivalent | |
1942 // flag is not cleared until we set the ext_suspended flag so | |
1943 // that wait_for_ext_suspend_completion() returns consistent | |
1944 // results. | |
1945 this->clear_suspend_equivalent(); | |
1946 } | |
1947 | |
1948 // A racing resume may have cancelled us before we grabbed SR_lock | |
1949 // above. Or another external suspend request could be waiting for us | |
1950 // by the time we return from SR_lock()->wait(). The thread | |
1951 // that requested the suspension may already be trying to walk our | |
1952 // stack and if we return now, we can change the stack out from under | |
1953 // it. This would be a "bad thing (TM)" and cause the stack walker | |
1954 // to crash. We stay self-suspended until there are no more pending | |
1955 // external suspend requests. | |
1956 while (is_external_suspend()) { | |
1957 ret++; | |
1958 this->set_ext_suspended(); | |
1959 | |
1960 // _ext_suspended flag is cleared by java_resume() | |
1961 while (is_ext_suspended()) { | |
1962 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
1963 } | |
1964 } | |
1965 | |
1966 return ret; | |
1967 } | |
1968 | |
1969 #ifdef ASSERT | |
1970 // verify the JavaThread has not yet been published in the Threads::list, and | |
1971 // hence doesn't need protection from concurrent access at this stage | |
1972 void JavaThread::verify_not_published() { | |
1973 if (!Threads_lock->owned_by_self()) { | |
1974 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
1975 assert( !Threads::includes(this), | |
1976 "java thread shouldn't have been published yet!"); | |
1977 } | |
1978 else { | |
1979 assert( !Threads::includes(this), | |
1980 "java thread shouldn't have been published yet!"); | |
1981 } | |
1982 } | |
1983 #endif | |
1984 | |
1985 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
1986 // progress or when _suspend_flags is non-zero. | |
1987 // Current thread needs to self-suspend if there is a suspend request and/or | |
1988 // block if a safepoint is in progress. | |
1989 // Async exception ISN'T checked. | |
1990 // Note only the ThreadInVMfromNative transition can call this function | |
1991 // directly and when thread state is _thread_in_native_trans | |
1992 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
1993 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
1994 | |
1995 JavaThread *curJT = JavaThread::current(); | |
1996 bool do_self_suspend = thread->is_external_suspend(); | |
1997 | |
1998 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
1999 | |
2000 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2001 // thread is not the current thread. In older versions of jdbx, jdbx | |
2002 // threads could call into the VM with another thread's JNIEnv so we | |
2003 // can be here operating on behalf of a suspended thread (4432884). | |
2004 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
2005 JavaThreadState state = thread->thread_state(); | |
2006 | |
2007 // We mark this thread_blocked state as a suspend-equivalent so | |
2008 // that a caller to is_ext_suspend_completed() won't be confused. | |
2009 // The suspend-equivalent state is cleared by java_suspend_self(). | |
2010 thread->set_suspend_equivalent(); | |
2011 | |
2012 // If the safepoint code sees the _thread_in_native_trans state, it will | |
2013 // wait until the thread changes to other thread state. There is no | |
2014 // guarantee on how soon we can obtain the SR_lock and complete the | |
2015 // self-suspend request. It would be a bad idea to let safepoint wait for | |
2016 // too long. Temporarily change the state to _thread_blocked to | |
2017 // let the VM thread know that this thread is ready for GC. The problem | |
2018 // of changing thread state is that safepoint could happen just after | |
2019 // java_suspend_self() returns after being resumed, and VM thread will | |
2020 // see the _thread_blocked state. We must check for safepoint | |
2021 // after restoring the state and make sure we won't leave while a safepoint | |
2022 // is in progress. | |
2023 thread->set_thread_state(_thread_blocked); | |
2024 thread->java_suspend_self(); | |
2025 thread->set_thread_state(state); | |
2026 // Make sure new state is seen by VM thread | |
2027 if (os::is_MP()) { | |
2028 if (UseMembar) { | |
2029 // Force a fence between the write above and read below | |
2030 OrderAccess::fence(); | |
2031 } else { | |
2032 // Must use this rather than serialization page in particular on Windows | |
2033 InterfaceSupport::serialize_memory(thread); | |
2034 } | |
2035 } | |
2036 } | |
2037 | |
2038 if (SafepointSynchronize::do_call_back()) { | |
2039 // If we are safepointing, then block the caller which may not be | |
2040 // the same as the target thread (see above). | |
2041 SafepointSynchronize::block(curJT); | |
2042 } | |
2043 | |
2044 if (thread->is_deopt_suspend()) { | |
2045 thread->clear_deopt_suspend(); | |
2046 RegisterMap map(thread, false); | |
2047 frame f = thread->last_frame(); | |
2048 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
2049 f = f.sender(&map); | |
2050 } | |
2051 if (f.id() == thread->must_deopt_id()) { | |
2052 thread->clear_must_deopt_id(); | |
2053 // Since we know we're safe to deopt the current state is a safe state | |
2054 f.deoptimize(thread, true); | |
2055 } else { | |
2056 fatal("missed deoptimization!"); | |
2057 } | |
2058 } | |
2059 } | |
2060 | |
2061 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2062 // progress or when _suspend_flags is non-zero. | |
2063 // Current thread needs to self-suspend if there is a suspend request and/or | |
2064 // block if a safepoint is in progress. | |
2065 // Also check for pending async exception (not including unsafe access error). | |
2066 // Note only the native==>VM/Java barriers can call this function and when | |
2067 // thread state is _thread_in_native_trans. | |
2068 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
2069 check_safepoint_and_suspend_for_native_trans(thread); | |
2070 | |
2071 if (thread->has_async_exception()) { | |
2072 // We are in _thread_in_native_trans state, don't handle unsafe | |
2073 // access error since that may block. | |
2074 thread->check_and_handle_async_exceptions(false); | |
2075 } | |
2076 } | |
2077 | |
2078 // We need to guarantee the Threads_lock here, since resumes are not | |
2079 // allowed during safepoint synchronization | |
2080 // Can only resume from an external suspension | |
2081 void JavaThread::java_resume() { | |
2082 assert_locked_or_safepoint(Threads_lock); | |
2083 | |
2084 // Sanity check: thread is gone, has started exiting or the thread | |
2085 // was not externally suspended. | |
2086 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
2087 return; | |
2088 } | |
2089 | |
2090 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2091 | |
2092 clear_external_suspend(); | |
2093 | |
2094 if (is_ext_suspended()) { | |
2095 clear_ext_suspended(); | |
2096 SR_lock()->notify_all(); | |
2097 } | |
2098 } | |
2099 | |
2100 void JavaThread::create_stack_guard_pages() { | |
2101 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
2102 address low_addr = stack_base() - stack_size(); | |
2103 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2104 | |
2105 int allocate = os::allocate_stack_guard_pages(); | |
2106 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
2107 | |
2108 if (allocate && !os::commit_memory((char *) low_addr, len)) { | |
2109 warning("Attempt to allocate stack guard pages failed."); | |
2110 return; | |
2111 } | |
2112 | |
2113 if (os::guard_memory((char *) low_addr, len)) { | |
2114 _stack_guard_state = stack_guard_enabled; | |
2115 } else { | |
2116 warning("Attempt to protect stack guard pages failed."); | |
2117 if (os::uncommit_memory((char *) low_addr, len)) { | |
2118 warning("Attempt to deallocate stack guard pages failed."); | |
2119 } | |
2120 } | |
2121 } | |
2122 | |
2123 void JavaThread::remove_stack_guard_pages() { | |
2124 if (_stack_guard_state == stack_guard_unused) return; | |
2125 address low_addr = stack_base() - stack_size(); | |
2126 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2127 | |
2128 if (os::allocate_stack_guard_pages()) { | |
2129 if (os::uncommit_memory((char *) low_addr, len)) { | |
2130 _stack_guard_state = stack_guard_unused; | |
2131 } else { | |
2132 warning("Attempt to deallocate stack guard pages failed."); | |
2133 } | |
2134 } else { | |
2135 if (_stack_guard_state == stack_guard_unused) return; | |
2136 if (os::unguard_memory((char *) low_addr, len)) { | |
2137 _stack_guard_state = stack_guard_unused; | |
2138 } else { | |
2139 warning("Attempt to unprotect stack guard pages failed."); | |
2140 } | |
2141 } | |
2142 } | |
2143 | |
2144 void JavaThread::enable_stack_yellow_zone() { | |
2145 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2146 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
2147 | |
2148 // The base notation is from the stacks point of view, growing downward. | |
2149 // We need to adjust it to work correctly with guard_memory() | |
2150 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2151 | |
2152 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
2153 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
2154 | |
2155 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
2156 _stack_guard_state = stack_guard_enabled; | |
2157 } else { | |
2158 warning("Attempt to guard stack yellow zone failed."); | |
2159 } | |
2160 enable_register_stack_guard(); | |
2161 } | |
2162 | |
2163 void JavaThread::disable_stack_yellow_zone() { | |
2164 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2165 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
2166 | |
2167 // Simply return if called for a thread that does not use guard pages. | |
2168 if (_stack_guard_state == stack_guard_unused) return; | |
2169 | |
2170 // The base notation is from the stacks point of view, growing downward. | |
2171 // We need to adjust it to work correctly with guard_memory() | |
2172 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2173 | |
2174 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
2175 _stack_guard_state = stack_guard_yellow_disabled; | |
2176 } else { | |
2177 warning("Attempt to unguard stack yellow zone failed."); | |
2178 } | |
2179 disable_register_stack_guard(); | |
2180 } | |
2181 | |
2182 void JavaThread::enable_stack_red_zone() { | |
2183 // The base notation is from the stacks point of view, growing downward. | |
2184 // We need to adjust it to work correctly with guard_memory() | |
2185 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2186 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2187 | |
2188 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
2189 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
2190 | |
2191 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
2192 warning("Attempt to guard stack red zone failed."); | |
2193 } | |
2194 } | |
2195 | |
2196 void JavaThread::disable_stack_red_zone() { | |
2197 // The base notation is from the stacks point of view, growing downward. | |
2198 // We need to adjust it to work correctly with guard_memory() | |
2199 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2200 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2201 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
2202 warning("Attempt to unguard stack red zone failed."); | |
2203 } | |
2204 } | |
2205 | |
2206 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
2207 // ignore is there is no stack | |
2208 if (!has_last_Java_frame()) return; | |
2209 // traverse the stack frames. Starts from top frame. | |
2210 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2211 frame* fr = fst.current(); | |
2212 f(fr, fst.register_map()); | |
2213 } | |
2214 } | |
2215 | |
2216 | |
2217 #ifndef PRODUCT | |
2218 // Deoptimization | |
2219 // Function for testing deoptimization | |
2220 void JavaThread::deoptimize() { | |
2221 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2222 StackFrameStream fst(this, UseBiasedLocking); | |
2223 bool deopt = false; // Dump stack only if a deopt actually happens. | |
2224 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
2225 // Iterate over all frames in the thread and deoptimize | |
2226 for(; !fst.is_done(); fst.next()) { | |
2227 if(fst.current()->can_be_deoptimized()) { | |
2228 | |
2229 if (only_at) { | |
2230 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
2231 // consists of comma or carriage return separated numbers so | |
2232 // search for the current bci in that string. | |
2233 address pc = fst.current()->pc(); | |
2234 nmethod* nm = (nmethod*) fst.current()->cb(); | |
2235 ScopeDesc* sd = nm->scope_desc_at( pc); | |
2236 char buffer[8]; | |
2237 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
2238 size_t len = strlen(buffer); | |
2239 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
2240 while (found != NULL) { | |
2241 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
2242 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
2243 // Check that the bci found is bracketed by terminators. | |
2244 break; | |
2245 } | |
2246 found = strstr(found + 1, buffer); | |
2247 } | |
2248 if (!found) { | |
2249 continue; | |
2250 } | |
2251 } | |
2252 | |
2253 if (DebugDeoptimization && !deopt) { | |
2254 deopt = true; // One-time only print before deopt | |
2255 tty->print_cr("[BEFORE Deoptimization]"); | |
2256 trace_frames(); | |
2257 trace_stack(); | |
2258 } | |
2259 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2260 } | |
2261 } | |
2262 | |
2263 if (DebugDeoptimization && deopt) { | |
2264 tty->print_cr("[AFTER Deoptimization]"); | |
2265 trace_frames(); | |
2266 } | |
2267 } | |
2268 | |
2269 | |
2270 // Make zombies | |
2271 void JavaThread::make_zombies() { | |
2272 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2273 if (fst.current()->can_be_deoptimized()) { | |
2274 // it is a Java nmethod | |
2275 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
2276 nm->make_not_entrant(); | |
2277 } | |
2278 } | |
2279 } | |
2280 #endif // PRODUCT | |
2281 | |
2282 | |
2283 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
2284 if (!has_last_Java_frame()) return; | |
2285 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2286 StackFrameStream fst(this, UseBiasedLocking); | |
2287 for(; !fst.is_done(); fst.next()) { | |
2288 if (fst.current()->should_be_deoptimized()) { | |
2289 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2290 } | |
2291 } | |
2292 } | |
2293 | |
2294 | |
2295 // GC support | |
2296 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
2297 | |
2298 void JavaThread::gc_epilogue() { | |
2299 frames_do(frame_gc_epilogue); | |
2300 } | |
2301 | |
2302 | |
2303 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
2304 | |
2305 void JavaThread::gc_prologue() { | |
2306 frames_do(frame_gc_prologue); | |
2307 } | |
2308 | |
2309 | |
2310 void JavaThread::oops_do(OopClosure* f) { | |
2311 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do | |
2312 // since there may be more than one thread using each ThreadProfiler. | |
2313 | |
2314 // Traverse the GCHandles | |
2315 Thread::oops_do(f); | |
2316 | |
2317 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2318 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2319 | |
2320 if (has_last_Java_frame()) { | |
2321 | |
2322 // Traverse the privileged stack | |
2323 if (_privileged_stack_top != NULL) { | |
2324 _privileged_stack_top->oops_do(f); | |
2325 } | |
2326 | |
2327 // traverse the registered growable array | |
2328 if (_array_for_gc != NULL) { | |
2329 for (int index = 0; index < _array_for_gc->length(); index++) { | |
2330 f->do_oop(_array_for_gc->adr_at(index)); | |
2331 } | |
2332 } | |
2333 | |
2334 // Traverse the monitor chunks | |
2335 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
2336 chunk->oops_do(f); | |
2337 } | |
2338 | |
2339 // Traverse the execution stack | |
2340 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2341 fst.current()->oops_do(f, fst.register_map()); | |
2342 } | |
2343 } | |
2344 | |
2345 // callee_target is never live across a gc point so NULL it here should | |
2346 // it still contain a methdOop. | |
2347 | |
2348 set_callee_target(NULL); | |
2349 | |
2350 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
2351 // If we have deferred set_locals there might be oops waiting to be | |
2352 // written | |
2353 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
2354 if (list != NULL) { | |
2355 for (int i = 0; i < list->length(); i++) { | |
2356 list->at(i)->oops_do(f); | |
2357 } | |
2358 } | |
2359 | |
2360 // Traverse instance variables at the end since the GC may be moving things | |
2361 // around using this function | |
2362 f->do_oop((oop*) &_threadObj); | |
2363 f->do_oop((oop*) &_vm_result); | |
2364 f->do_oop((oop*) &_vm_result_2); | |
2365 f->do_oop((oop*) &_exception_oop); | |
2366 f->do_oop((oop*) &_pending_async_exception); | |
2367 | |
2368 if (jvmti_thread_state() != NULL) { | |
2369 jvmti_thread_state()->oops_do(f); | |
2370 } | |
2371 } | |
2372 | |
2373 void JavaThread::nmethods_do() { | |
2374 // Traverse the GCHandles | |
2375 Thread::nmethods_do(); | |
2376 | |
2377 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2378 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2379 | |
2380 if (has_last_Java_frame()) { | |
2381 // Traverse the execution stack | |
2382 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2383 fst.current()->nmethods_do(); | |
2384 } | |
2385 } | |
2386 } | |
2387 | |
2388 // Printing | |
2389 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
2390 switch (_thread_state) { | |
2391 case _thread_uninitialized: return "_thread_uninitialized"; | |
2392 case _thread_new: return "_thread_new"; | |
2393 case _thread_new_trans: return "_thread_new_trans"; | |
2394 case _thread_in_native: return "_thread_in_native"; | |
2395 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
2396 case _thread_in_vm: return "_thread_in_vm"; | |
2397 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
2398 case _thread_in_Java: return "_thread_in_Java"; | |
2399 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
2400 case _thread_blocked: return "_thread_blocked"; | |
2401 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
2402 default: return "unknown thread state"; | |
2403 } | |
2404 } | |
2405 | |
2406 #ifndef PRODUCT | |
2407 void JavaThread::print_thread_state_on(outputStream *st) const { | |
2408 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
2409 }; | |
2410 void JavaThread::print_thread_state() const { | |
2411 print_thread_state_on(tty); | |
2412 }; | |
2413 #endif // PRODUCT | |
2414 | |
2415 // Called by Threads::print() for VM_PrintThreads operation | |
2416 void JavaThread::print_on(outputStream *st) const { | |
2417 st->print("\"%s\" ", get_thread_name()); | |
2418 oop thread_oop = threadObj(); | |
2419 if (thread_oop != NULL && java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
2420 Thread::print_on(st); | |
2421 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
2422 st->print_cr("[" INTPTR_FORMAT ".." INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12), highest_lock()); | |
2423 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { | |
2424 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
2425 } | |
2426 #ifndef PRODUCT | |
2427 print_thread_state_on(st); | |
2428 _safepoint_state->print_on(st); | |
2429 #endif // PRODUCT | |
2430 } | |
2431 | |
2432 // Called by fatal error handler. The difference between this and | |
2433 // JavaThread::print() is that we can't grab lock or allocate memory. | |
2434 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
2435 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
2436 oop thread_obj = threadObj(); | |
2437 if (thread_obj != NULL) { | |
2438 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
2439 } | |
2440 st->print(" ["); | |
2441 st->print("%s", _get_thread_state_name(_thread_state)); | |
2442 if (osthread()) { | |
2443 st->print(", id=%d", osthread()->thread_id()); | |
2444 } | |
2445 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
2446 _stack_base - _stack_size, _stack_base); | |
2447 st->print("]"); | |
2448 return; | |
2449 } | |
2450 | |
2451 // Verification | |
2452 | |
2453 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
2454 | |
2455 void JavaThread::verify() { | |
2456 // Verify oops in the thread. | |
2457 oops_do(&VerifyOopClosure::verify_oop); | |
2458 | |
2459 // Verify the stack frames. | |
2460 frames_do(frame_verify); | |
2461 } | |
2462 | |
2463 // CR 6300358 (sub-CR 2137150) | |
2464 // Most callers of this method assume that it can't return NULL but a | |
2465 // thread may not have a name whilst it is in the process of attaching to | |
2466 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
2467 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
2468 // if vm exit occurs during initialization). These cases can all be accounted | |
2469 // for such that this method never returns NULL. | |
2470 const char* JavaThread::get_thread_name() const { | |
2471 #ifdef ASSERT | |
2472 // early safepoints can hit while current thread does not yet have TLS | |
2473 if (!SafepointSynchronize::is_at_safepoint()) { | |
2474 Thread *cur = Thread::current(); | |
2475 if (!(cur->is_Java_thread() && cur == this)) { | |
2476 // Current JavaThreads are allowed to get their own name without | |
2477 // the Threads_lock. | |
2478 assert_locked_or_safepoint(Threads_lock); | |
2479 } | |
2480 } | |
2481 #endif // ASSERT | |
2482 return get_thread_name_string(); | |
2483 } | |
2484 | |
2485 // Returns a non-NULL representation of this thread's name, or a suitable | |
2486 // descriptive string if there is no set name | |
2487 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
2488 const char* name_str; | |
2489 oop thread_obj = threadObj(); | |
2490 if (thread_obj != NULL) { | |
2491 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
2492 if (name != NULL) { | |
2493 if (buf == NULL) { | |
2494 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2495 } | |
2496 else { | |
2497 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
2498 } | |
2499 } | |
2500 else if (is_attaching()) { // workaround for 6412693 - see 6404306 | |
2501 name_str = "<no-name - thread is attaching>"; | |
2502 } | |
2503 else { | |
2504 name_str = Thread::name(); | |
2505 } | |
2506 } | |
2507 else { | |
2508 name_str = Thread::name(); | |
2509 } | |
2510 assert(name_str != NULL, "unexpected NULL thread name"); | |
2511 return name_str; | |
2512 } | |
2513 | |
2514 | |
2515 const char* JavaThread::get_threadgroup_name() const { | |
2516 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2517 oop thread_obj = threadObj(); | |
2518 if (thread_obj != NULL) { | |
2519 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2520 if (thread_group != NULL) { | |
2521 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
2522 // ThreadGroup.name can be null | |
2523 if (name != NULL) { | |
2524 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2525 return str; | |
2526 } | |
2527 } | |
2528 } | |
2529 return NULL; | |
2530 } | |
2531 | |
2532 const char* JavaThread::get_parent_name() const { | |
2533 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2534 oop thread_obj = threadObj(); | |
2535 if (thread_obj != NULL) { | |
2536 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2537 if (thread_group != NULL) { | |
2538 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
2539 if (parent != NULL) { | |
2540 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
2541 // ThreadGroup.name can be null | |
2542 if (name != NULL) { | |
2543 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2544 return str; | |
2545 } | |
2546 } | |
2547 } | |
2548 } | |
2549 return NULL; | |
2550 } | |
2551 | |
2552 ThreadPriority JavaThread::java_priority() const { | |
2553 oop thr_oop = threadObj(); | |
2554 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
2555 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
2556 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
2557 return priority; | |
2558 } | |
2559 | |
2560 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
2561 | |
2562 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
2563 // Link Java Thread object <-> C++ Thread | |
2564 | |
2565 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
2566 // and put it into a new Handle. The Handle "thread_oop" can then | |
2567 // be used to pass the C++ thread object to other methods. | |
2568 | |
2569 // Set the Java level thread object (jthread) field of the | |
2570 // new thread (a JavaThread *) to C++ thread object using the | |
2571 // "thread_oop" handle. | |
2572 | |
2573 // Set the thread field (a JavaThread *) of the | |
2574 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
2575 | |
2576 Handle thread_oop(Thread::current(), | |
2577 JNIHandles::resolve_non_null(jni_thread)); | |
2578 assert(instanceKlass::cast(thread_oop->klass())->is_linked(), | |
2579 "must be initialized"); | |
2580 set_threadObj(thread_oop()); | |
2581 java_lang_Thread::set_thread(thread_oop(), this); | |
2582 | |
2583 if (prio == NoPriority) { | |
2584 prio = java_lang_Thread::priority(thread_oop()); | |
2585 assert(prio != NoPriority, "A valid priority should be present"); | |
2586 } | |
2587 | |
2588 // Push the Java priority down to the native thread; needs Threads_lock | |
2589 Thread::set_priority(this, prio); | |
2590 | |
2591 // Add the new thread to the Threads list and set it in motion. | |
2592 // We must have threads lock in order to call Threads::add. | |
2593 // It is crucial that we do not block before the thread is | |
2594 // added to the Threads list for if a GC happens, then the java_thread oop | |
2595 // will not be visited by GC. | |
2596 Threads::add(this); | |
2597 } | |
2598 | |
2599 oop JavaThread::current_park_blocker() { | |
2600 // Support for JSR-166 locks | |
2601 oop thread_oop = threadObj(); | |
242 | 2602 if (thread_oop != NULL && |
2603 JDK_Version::current().supports_thread_park_blocker()) { | |
0 | 2604 return java_lang_Thread::park_blocker(thread_oop); |
2605 } | |
2606 return NULL; | |
2607 } | |
2608 | |
2609 | |
2610 void JavaThread::print_stack_on(outputStream* st) { | |
2611 if (!has_last_Java_frame()) return; | |
2612 ResourceMark rm; | |
2613 HandleMark hm; | |
2614 | |
2615 RegisterMap reg_map(this); | |
2616 vframe* start_vf = last_java_vframe(®_map); | |
2617 int count = 0; | |
2618 for (vframe* f = start_vf; f; f = f->sender() ) { | |
2619 if (f->is_java_frame()) { | |
2620 javaVFrame* jvf = javaVFrame::cast(f); | |
2621 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
2622 | |
2623 // Print out lock information | |
2624 if (JavaMonitorsInStackTrace) { | |
2625 jvf->print_lock_info_on(st, count); | |
2626 } | |
2627 } else { | |
2628 // Ignore non-Java frames | |
2629 } | |
2630 | |
2631 // Bail-out case for too deep stacks | |
2632 count++; | |
2633 if (MaxJavaStackTraceDepth == count) return; | |
2634 } | |
2635 } | |
2636 | |
2637 | |
2638 // JVMTI PopFrame support | |
2639 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
2640 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
2641 if (in_bytes(size_in_bytes) != 0) { | |
2642 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes)); | |
2643 _popframe_preserved_args_size = in_bytes(size_in_bytes); | |
2644 Copy::conjoint_bytes(start, _popframe_preserved_args, _popframe_preserved_args_size); | |
2645 } | |
2646 } | |
2647 | |
2648 void* JavaThread::popframe_preserved_args() { | |
2649 return _popframe_preserved_args; | |
2650 } | |
2651 | |
2652 ByteSize JavaThread::popframe_preserved_args_size() { | |
2653 return in_ByteSize(_popframe_preserved_args_size); | |
2654 } | |
2655 | |
2656 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
2657 int sz = in_bytes(popframe_preserved_args_size()); | |
2658 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
2659 return in_WordSize(sz / wordSize); | |
2660 } | |
2661 | |
2662 void JavaThread::popframe_free_preserved_args() { | |
2663 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
2664 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args); | |
2665 _popframe_preserved_args = NULL; | |
2666 _popframe_preserved_args_size = 0; | |
2667 } | |
2668 | |
2669 #ifndef PRODUCT | |
2670 | |
2671 void JavaThread::trace_frames() { | |
2672 tty->print_cr("[Describe stack]"); | |
2673 int frame_no = 1; | |
2674 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2675 tty->print(" %d. ", frame_no++); | |
2676 fst.current()->print_value_on(tty,this); | |
2677 tty->cr(); | |
2678 } | |
2679 } | |
2680 | |
2681 | |
2682 void JavaThread::trace_stack_from(vframe* start_vf) { | |
2683 ResourceMark rm; | |
2684 int vframe_no = 1; | |
2685 for (vframe* f = start_vf; f; f = f->sender() ) { | |
2686 if (f->is_java_frame()) { | |
2687 javaVFrame::cast(f)->print_activation(vframe_no++); | |
2688 } else { | |
2689 f->print(); | |
2690 } | |
2691 if (vframe_no > StackPrintLimit) { | |
2692 tty->print_cr("...<more frames>..."); | |
2693 return; | |
2694 } | |
2695 } | |
2696 } | |
2697 | |
2698 | |
2699 void JavaThread::trace_stack() { | |
2700 if (!has_last_Java_frame()) return; | |
2701 ResourceMark rm; | |
2702 HandleMark hm; | |
2703 RegisterMap reg_map(this); | |
2704 trace_stack_from(last_java_vframe(®_map)); | |
2705 } | |
2706 | |
2707 | |
2708 #endif // PRODUCT | |
2709 | |
2710 | |
2711 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
2712 assert(reg_map != NULL, "a map must be given"); | |
2713 frame f = last_frame(); | |
2714 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
2715 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
2716 } | |
2717 return NULL; | |
2718 } | |
2719 | |
2720 | |
2721 klassOop JavaThread::security_get_caller_class(int depth) { | |
2722 vframeStream vfst(this); | |
2723 vfst.security_get_caller_frame(depth); | |
2724 if (!vfst.at_end()) { | |
2725 return vfst.method()->method_holder(); | |
2726 } | |
2727 return NULL; | |
2728 } | |
2729 | |
2730 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
2731 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
2732 CompileBroker::compiler_thread_loop(); | |
2733 } | |
2734 | |
2735 // Create a CompilerThread | |
2736 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
2737 : JavaThread(&compiler_thread_entry) { | |
2738 _env = NULL; | |
2739 _log = NULL; | |
2740 _task = NULL; | |
2741 _queue = queue; | |
2742 _counters = counters; | |
2743 | |
2744 #ifndef PRODUCT | |
2745 _ideal_graph_printer = NULL; | |
2746 #endif | |
2747 } | |
2748 | |
2749 | |
2750 // ======= Threads ======== | |
2751 | |
2752 // The Threads class links together all active threads, and provides | |
2753 // operations over all threads. It is protected by its own Mutex | |
2754 // lock, which is also used in other contexts to protect thread | |
2755 // operations from having the thread being operated on from exiting | |
2756 // and going away unexpectedly (e.g., safepoint synchronization) | |
2757 | |
2758 JavaThread* Threads::_thread_list = NULL; | |
2759 int Threads::_number_of_threads = 0; | |
2760 int Threads::_number_of_non_daemon_threads = 0; | |
2761 int Threads::_return_code = 0; | |
2762 size_t JavaThread::_stack_size_at_create = 0; | |
2763 | |
2764 // All JavaThreads | |
2765 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
2766 | |
2767 void os_stream(); | |
2768 | |
2769 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
2770 void Threads::threads_do(ThreadClosure* tc) { | |
2771 assert_locked_or_safepoint(Threads_lock); | |
2772 // ALL_JAVA_THREADS iterates through all JavaThreads | |
2773 ALL_JAVA_THREADS(p) { | |
2774 tc->do_thread(p); | |
2775 } | |
2776 // Someday we could have a table or list of all non-JavaThreads. | |
2777 // For now, just manually iterate through them. | |
2778 tc->do_thread(VMThread::vm_thread()); | |
2779 Universe::heap()->gc_threads_do(tc); | |
286
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2780 { |
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2781 // Grab the Terminator_lock to prevent watcher_thread from being terminated. |
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2782 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); |
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2783 WatcherThread *wt = WatcherThread::watcher_thread(); |
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2784 if (wt != NULL) |
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2785 tc->do_thread(wt); |
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2786 } |
0 | 2787 // If CompilerThreads ever become non-JavaThreads, add them here |
2788 } | |
2789 | |
2790 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
2791 | |
242 | 2792 extern void JDK_Version_init(); |
2793 | |
0 | 2794 // Check version |
2795 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
2796 | |
2797 // Initialize the output stream module | |
2798 ostream_init(); | |
2799 | |
2800 // Process java launcher properties. | |
2801 Arguments::process_sun_java_launcher_properties(args); | |
2802 | |
2803 // Initialize the os module before using TLS | |
2804 os::init(); | |
2805 | |
2806 // Initialize system properties. | |
2807 Arguments::init_system_properties(); | |
2808 | |
242 | 2809 // So that JDK version can be used as a discrimintor when parsing arguments |
2810 JDK_Version_init(); | |
2811 | |
0 | 2812 // Parse arguments |
2813 jint parse_result = Arguments::parse(args); | |
2814 if (parse_result != JNI_OK) return parse_result; | |
2815 | |
2816 if (PauseAtStartup) { | |
2817 os::pause(); | |
2818 } | |
2819 | |
2820 HS_DTRACE_PROBE(hotspot, vm__init__begin); | |
2821 | |
2822 // Record VM creation timing statistics | |
2823 TraceVmCreationTime create_vm_timer; | |
2824 create_vm_timer.start(); | |
2825 | |
2826 // Timing (must come after argument parsing) | |
2827 TraceTime timer("Create VM", TraceStartupTime); | |
2828 | |
2829 // Initialize the os module after parsing the args | |
2830 jint os_init_2_result = os::init_2(); | |
2831 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
2832 | |
2833 // Initialize output stream logging | |
2834 ostream_init_log(); | |
2835 | |
2836 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
2837 // Must be before create_vm_init_agents() | |
2838 if (Arguments::init_libraries_at_startup()) { | |
2839 convert_vm_init_libraries_to_agents(); | |
2840 } | |
2841 | |
2842 // Launch -agentlib/-agentpath and converted -Xrun agents | |
2843 if (Arguments::init_agents_at_startup()) { | |
2844 create_vm_init_agents(); | |
2845 } | |
2846 | |
2847 // Initialize Threads state | |
2848 _thread_list = NULL; | |
2849 _number_of_threads = 0; | |
2850 _number_of_non_daemon_threads = 0; | |
2851 | |
2852 // Initialize TLS | |
2853 ThreadLocalStorage::init(); | |
2854 | |
2855 // Initialize global data structures and create system classes in heap | |
2856 vm_init_globals(); | |
2857 | |
2858 // Attach the main thread to this os thread | |
2859 JavaThread* main_thread = new JavaThread(); | |
2860 main_thread->set_thread_state(_thread_in_vm); | |
2861 // must do this before set_active_handles and initialize_thread_local_storage | |
2862 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
2863 // change the stack size recorded here to one based on the java thread | |
2864 // stacksize. This adjusted size is what is used to figure the placement | |
2865 // of the guard pages. | |
2866 main_thread->record_stack_base_and_size(); | |
2867 main_thread->initialize_thread_local_storage(); | |
2868 | |
2869 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
2870 | |
2871 if (!main_thread->set_as_starting_thread()) { | |
2872 vm_shutdown_during_initialization( | |
2873 "Failed necessary internal allocation. Out of swap space"); | |
2874 delete main_thread; | |
2875 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
2876 return JNI_ENOMEM; | |
2877 } | |
2878 | |
2879 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
2880 // crash Linux VM, see notes in os_linux.cpp. | |
2881 main_thread->create_stack_guard_pages(); | |
2882 | |
2883 // Initialize Java-Leve synchronization subsystem | |
2884 ObjectSynchronizer::Initialize() ; | |
2885 | |
2886 // Initialize global modules | |
2887 jint status = init_globals(); | |
2888 if (status != JNI_OK) { | |
2889 delete main_thread; | |
2890 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
2891 return status; | |
2892 } | |
2893 | |
2894 HandleMark hm; | |
2895 | |
2896 { MutexLocker mu(Threads_lock); | |
2897 Threads::add(main_thread); | |
2898 } | |
2899 | |
2900 // Any JVMTI raw monitors entered in onload will transition into | |
2901 // real raw monitor. VM is setup enough here for raw monitor enter. | |
2902 JvmtiExport::transition_pending_onload_raw_monitors(); | |
2903 | |
2904 if (VerifyBeforeGC && | |
2905 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
2906 Universe::heap()->prepare_for_verify(); | |
2907 Universe::verify(); // make sure we're starting with a clean slate | |
2908 } | |
2909 | |
2910 // Create the VMThread | |
2911 { TraceTime timer("Start VMThread", TraceStartupTime); | |
2912 VMThread::create(); | |
2913 Thread* vmthread = VMThread::vm_thread(); | |
2914 | |
2915 if (!os::create_thread(vmthread, os::vm_thread)) | |
2916 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
2917 | |
2918 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
2919 // Monitors can have spurious returns, must always check another state flag | |
2920 { | |
2921 MutexLocker ml(Notify_lock); | |
2922 os::start_thread(vmthread); | |
2923 while (vmthread->active_handles() == NULL) { | |
2924 Notify_lock->wait(); | |
2925 } | |
2926 } | |
2927 } | |
2928 | |
2929 assert (Universe::is_fully_initialized(), "not initialized"); | |
2930 EXCEPTION_MARK; | |
2931 | |
2932 // At this point, the Universe is initialized, but we have not executed | |
2933 // any byte code. Now is a good time (the only time) to dump out the | |
2934 // internal state of the JVM for sharing. | |
2935 | |
2936 if (DumpSharedSpaces) { | |
2937 Universe::heap()->preload_and_dump(CHECK_0); | |
2938 ShouldNotReachHere(); | |
2939 } | |
2940 | |
2941 // Always call even when there are not JVMTI environments yet, since environments | |
2942 // may be attached late and JVMTI must track phases of VM execution | |
2943 JvmtiExport::enter_start_phase(); | |
2944 | |
2945 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
2946 JvmtiExport::post_vm_start(); | |
2947 | |
2948 { | |
2949 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
2950 | |
2951 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
2952 create_vm_init_libraries(); | |
2953 } | |
2954 | |
2955 if (InitializeJavaLangString) { | |
2956 initialize_class(vmSymbolHandles::java_lang_String(), CHECK_0); | |
2957 } else { | |
2958 warning("java.lang.String not initialized"); | |
2959 } | |
2960 | |
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2961 if (AggressiveOpts) { |
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2962 { |
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2963 // Forcibly initialize java/util/HashMap and mutate the private |
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2964 // static final "frontCacheEnabled" field before we start creating instances |
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2965 #ifdef ASSERT |
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2966 klassOop tmp_k = SystemDictionary::find(vmSymbolHandles::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
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2967 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
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2968 #endif |
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2969 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbolHandles::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
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2970 KlassHandle k = KlassHandle(THREAD, k_o); |
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2971 guarantee(k.not_null(), "Must find java/util/HashMap"); |
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2972 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
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2973 ik->initialize(CHECK_0); |
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2974 fieldDescriptor fd; |
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2975 // Possible we might not find this field; if so, don't break |
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2976 if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
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2977 k()->bool_field_put(fd.offset(), true); |
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2978 } |
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2979 } |
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2980 |
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2981 if (UseStringCache) { |
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2982 // Forcibly initialize java/lang/String and mutate the private |
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2983 // static final "stringCacheEnabled" field before we start creating instances |
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2984 #ifdef ASSERT |
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2985 klassOop tmp_k = SystemDictionary::find(vmSymbolHandles::java_lang_String(), Handle(), Handle(), CHECK_0); |
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2986 assert(tmp_k == NULL, "java/lang/String should not be loaded yet"); |
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2987 #endif |
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2988 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbolHandles::java_lang_String(), Handle(), Handle(), CHECK_0); |
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2989 KlassHandle k = KlassHandle(THREAD, k_o); |
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2990 guarantee(k.not_null(), "Must find java/lang/String"); |
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2991 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
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2992 ik->initialize(CHECK_0); |
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2993 fieldDescriptor fd; |
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2994 // Possible we might not find this field; if so, don't break |
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2995 if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
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2996 k()->bool_field_put(fd.offset(), true); |
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2997 } |
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2998 } |
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2999 } |
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3000 |
0 | 3001 // Initialize java_lang.System (needed before creating the thread) |
3002 if (InitializeJavaLangSystem) { | |
3003 initialize_class(vmSymbolHandles::java_lang_System(), CHECK_0); | |
3004 initialize_class(vmSymbolHandles::java_lang_ThreadGroup(), CHECK_0); | |
3005 Handle thread_group = create_initial_thread_group(CHECK_0); | |
3006 Universe::set_main_thread_group(thread_group()); | |
3007 initialize_class(vmSymbolHandles::java_lang_Thread(), CHECK_0); | |
3008 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); | |
3009 main_thread->set_threadObj(thread_object); | |
3010 // Set thread status to running since main thread has | |
3011 // been started and running. | |
3012 java_lang_Thread::set_thread_status(thread_object, | |
3013 java_lang_Thread::RUNNABLE); | |
3014 | |
3015 // The VM preresolve methods to these classes. Make sure that get initialized | |
3016 initialize_class(vmSymbolHandles::java_lang_reflect_Method(), CHECK_0); | |
3017 initialize_class(vmSymbolHandles::java_lang_ref_Finalizer(), CHECK_0); | |
3018 // The VM creates & returns objects of this class. Make sure it's initialized. | |
3019 initialize_class(vmSymbolHandles::java_lang_Class(), CHECK_0); | |
3020 call_initializeSystemClass(CHECK_0); | |
3021 } else { | |
3022 warning("java.lang.System not initialized"); | |
3023 } | |
3024 | |
3025 // an instance of OutOfMemory exception has been allocated earlier | |
3026 if (InitializeJavaLangExceptionsErrors) { | |
3027 initialize_class(vmSymbolHandles::java_lang_OutOfMemoryError(), CHECK_0); | |
3028 initialize_class(vmSymbolHandles::java_lang_NullPointerException(), CHECK_0); | |
3029 initialize_class(vmSymbolHandles::java_lang_ClassCastException(), CHECK_0); | |
3030 initialize_class(vmSymbolHandles::java_lang_ArrayStoreException(), CHECK_0); | |
3031 initialize_class(vmSymbolHandles::java_lang_ArithmeticException(), CHECK_0); | |
3032 initialize_class(vmSymbolHandles::java_lang_StackOverflowError(), CHECK_0); | |
3033 initialize_class(vmSymbolHandles::java_lang_IllegalMonitorStateException(), CHECK_0); | |
3034 } else { | |
3035 warning("java.lang.OutOfMemoryError has not been initialized"); | |
3036 warning("java.lang.NullPointerException has not been initialized"); | |
3037 warning("java.lang.ClassCastException has not been initialized"); | |
3038 warning("java.lang.ArrayStoreException has not been initialized"); | |
3039 warning("java.lang.ArithmeticException has not been initialized"); | |
3040 warning("java.lang.StackOverflowError has not been initialized"); | |
3041 } | |
3042 } | |
3043 | |
3044 // See : bugid 4211085. | |
3045 // Background : the static initializer of java.lang.Compiler tries to read | |
3046 // property"java.compiler" and read & write property "java.vm.info". | |
3047 // When a security manager is installed through the command line | |
3048 // option "-Djava.security.manager", the above properties are not | |
3049 // readable and the static initializer for java.lang.Compiler fails | |
3050 // resulting in a NoClassDefFoundError. This can happen in any | |
3051 // user code which calls methods in java.lang.Compiler. | |
3052 // Hack : the hack is to pre-load and initialize this class, so that only | |
3053 // system domains are on the stack when the properties are read. | |
3054 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
3055 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
3056 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
3057 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
3058 // Once that is done, we should remove this hack. | |
3059 initialize_class(vmSymbolHandles::java_lang_Compiler(), CHECK_0); | |
3060 | |
3061 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
3062 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
3063 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
3064 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
3065 // This should also be taken out as soon as 4211383 gets fixed. | |
3066 reset_vm_info_property(CHECK_0); | |
3067 | |
3068 quicken_jni_functions(); | |
3069 | |
3070 // Set flag that basic initialization has completed. Used by exceptions and various | |
3071 // debug stuff, that does not work until all basic classes have been initialized. | |
3072 set_init_completed(); | |
3073 | |
3074 HS_DTRACE_PROBE(hotspot, vm__init__end); | |
3075 | |
3076 // record VM initialization completion time | |
3077 Management::record_vm_init_completed(); | |
3078 | |
3079 // Compute system loader. Note that this has to occur after set_init_completed, since | |
3080 // valid exceptions may be thrown in the process. | |
3081 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
3082 // set_init_completed has just been called, causing exceptions not to be shortcut | |
3083 // anymore. We call vm_exit_during_initialization directly instead. | |
3084 SystemDictionary::compute_java_system_loader(THREAD); | |
3085 if (HAS_PENDING_EXCEPTION) { | |
3086 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3087 } | |
3088 | |
3089 #ifndef SERIALGC | |
3090 // Support for ConcurrentMarkSweep. This should be cleaned up | |
342
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3091 // and better encapsulated. The ugly nested if test would go away |
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3092 // once things are properly refactored. XXX YSR |
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3093 if (UseConcMarkSweepGC || UseG1GC) { |
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3094 if (UseConcMarkSweepGC) { |
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3095 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
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3096 } else { |
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3097 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
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3098 } |
0 | 3099 if (HAS_PENDING_EXCEPTION) { |
3100 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3101 } | |
3102 } | |
3103 #endif // SERIALGC | |
3104 | |
3105 // Always call even when there are not JVMTI environments yet, since environments | |
3106 // may be attached late and JVMTI must track phases of VM execution | |
3107 JvmtiExport::enter_live_phase(); | |
3108 | |
3109 // Signal Dispatcher needs to be started before VMInit event is posted | |
3110 os::signal_init(); | |
3111 | |
3112 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
3113 if (!DisableAttachMechanism) { | |
3114 if (StartAttachListener || AttachListener::init_at_startup()) { | |
3115 AttachListener::init(); | |
3116 } | |
3117 } | |
3118 | |
3119 // Launch -Xrun agents | |
3120 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
3121 // back-end can launch with -Xdebug -Xrunjdwp. | |
3122 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3123 create_vm_init_libraries(); | |
3124 } | |
3125 | |
3126 // Notify JVMTI agents that VM initialization is complete - nop if no agents. | |
3127 JvmtiExport::post_vm_initialized(); | |
3128 | |
3129 Chunk::start_chunk_pool_cleaner_task(); | |
3130 | |
3131 // initialize compiler(s) | |
3132 CompileBroker::compilation_init(); | |
3133 | |
3134 Management::initialize(THREAD); | |
3135 if (HAS_PENDING_EXCEPTION) { | |
3136 // management agent fails to start possibly due to | |
3137 // configuration problem and is responsible for printing | |
3138 // stack trace if appropriate. Simply exit VM. | |
3139 vm_exit(1); | |
3140 } | |
3141 | |
3142 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
3143 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
3144 if (MemProfiling) MemProfiler::engage(); | |
3145 StatSampler::engage(); | |
3146 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
3147 | |
3148 BiasedLocking::init(); | |
3149 | |
3150 | |
3151 // Start up the WatcherThread if there are any periodic tasks | |
3152 // NOTE: All PeriodicTasks should be registered by now. If they | |
3153 // aren't, late joiners might appear to start slowly (we might | |
3154 // take a while to process their first tick). | |
3155 if (PeriodicTask::num_tasks() > 0) { | |
3156 WatcherThread::start(); | |
3157 } | |
3158 | |
3159 create_vm_timer.end(); | |
3160 return JNI_OK; | |
3161 } | |
3162 | |
3163 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
3164 extern "C" { | |
3165 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
3166 } | |
3167 // Find a command line agent library and return its entry point for | |
3168 // -agentlib: -agentpath: -Xrun | |
3169 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
3170 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
3171 OnLoadEntry_t on_load_entry = NULL; | |
3172 void *library = agent->os_lib(); // check if we have looked it up before | |
3173 | |
3174 if (library == NULL) { | |
3175 char buffer[JVM_MAXPATHLEN]; | |
3176 char ebuf[1024]; | |
3177 const char *name = agent->name(); | |
3178 | |
3179 if (agent->is_absolute_path()) { | |
3180 library = hpi::dll_load(name, ebuf, sizeof ebuf); | |
3181 if (library == NULL) { | |
3182 // If we can't find the agent, exit. | |
3183 vm_exit_during_initialization("Could not find agent library in absolute path", name); | |
3184 } | |
3185 } else { | |
3186 // Try to load the agent from the standard dll directory | |
3187 hpi::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), name); | |
3188 library = hpi::dll_load(buffer, ebuf, sizeof ebuf); | |
3189 #ifdef KERNEL | |
3190 // Download instrument dll | |
3191 if (library == NULL && strcmp(name, "instrument") == 0) { | |
3192 char *props = Arguments::get_kernel_properties(); | |
3193 char *home = Arguments::get_java_home(); | |
3194 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
3195 " sun.jkernel.DownloadManager -download client_jvm"; | |
3196 int length = strlen(props) + strlen(home) + strlen(fmt) + 1; | |
3197 char *cmd = AllocateHeap(length); | |
3198 jio_snprintf(cmd, length, fmt, home, props); | |
3199 int status = os::fork_and_exec(cmd); | |
3200 FreeHeap(props); | |
3201 FreeHeap(cmd); | |
3202 if (status == -1) { | |
3203 warning(cmd); | |
3204 vm_exit_during_initialization("fork_and_exec failed: %s", | |
3205 strerror(errno)); | |
3206 } | |
3207 // when this comes back the instrument.dll should be where it belongs. | |
3208 library = hpi::dll_load(buffer, ebuf, sizeof ebuf); | |
3209 } | |
3210 #endif // KERNEL | |
3211 if (library == NULL) { // Try the local directory | |
3212 char ns[1] = {0}; | |
3213 hpi::dll_build_name(buffer, sizeof(buffer), ns, name); | |
3214 library = hpi::dll_load(buffer, ebuf, sizeof ebuf); | |
3215 if (library == NULL) { | |
3216 // If we can't find the agent, exit. | |
3217 vm_exit_during_initialization("Could not find agent library on the library path or in the local directory", name); | |
3218 } | |
3219 } | |
3220 } | |
3221 agent->set_os_lib(library); | |
3222 } | |
3223 | |
3224 // Find the OnLoad function. | |
3225 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
3226 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, hpi::dll_lookup(library, on_load_symbols[symbol_index])); | |
3227 if (on_load_entry != NULL) break; | |
3228 } | |
3229 return on_load_entry; | |
3230 } | |
3231 | |
3232 // Find the JVM_OnLoad entry point | |
3233 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
3234 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
3235 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3236 } | |
3237 | |
3238 // Find the Agent_OnLoad entry point | |
3239 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
3240 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
3241 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3242 } | |
3243 | |
3244 // For backwards compatibility with -Xrun | |
3245 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
3246 // treated like -agentpath: | |
3247 // Must be called before agent libraries are created | |
3248 void Threads::convert_vm_init_libraries_to_agents() { | |
3249 AgentLibrary* agent; | |
3250 AgentLibrary* next; | |
3251 | |
3252 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
3253 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
3254 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3255 | |
3256 // If there is an JVM_OnLoad function it will get called later, | |
3257 // otherwise see if there is an Agent_OnLoad | |
3258 if (on_load_entry == NULL) { | |
3259 on_load_entry = lookup_agent_on_load(agent); | |
3260 if (on_load_entry != NULL) { | |
3261 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
3262 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
3263 Arguments::convert_library_to_agent(agent); | |
3264 } else { | |
3265 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
3266 } | |
3267 } | |
3268 } | |
3269 } | |
3270 | |
3271 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
3272 // Invokes Agent_OnLoad | |
3273 // Called very early -- before JavaThreads exist | |
3274 void Threads::create_vm_init_agents() { | |
3275 extern struct JavaVM_ main_vm; | |
3276 AgentLibrary* agent; | |
3277 | |
3278 JvmtiExport::enter_onload_phase(); | |
3279 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3280 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
3281 | |
3282 if (on_load_entry != NULL) { | |
3283 // Invoke the Agent_OnLoad function | |
3284 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3285 if (err != JNI_OK) { | |
3286 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
3287 } | |
3288 } else { | |
3289 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
3290 } | |
3291 } | |
3292 JvmtiExport::enter_primordial_phase(); | |
3293 } | |
3294 | |
3295 extern "C" { | |
3296 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
3297 } | |
3298 | |
3299 void Threads::shutdown_vm_agents() { | |
3300 // Send any Agent_OnUnload notifications | |
3301 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
3302 extern struct JavaVM_ main_vm; | |
3303 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3304 | |
3305 // Find the Agent_OnUnload function. | |
3306 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
3307 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
3308 hpi::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); | |
3309 | |
3310 // Invoke the Agent_OnUnload function | |
3311 if (unload_entry != NULL) { | |
3312 JavaThread* thread = JavaThread::current(); | |
3313 ThreadToNativeFromVM ttn(thread); | |
3314 HandleMark hm(thread); | |
3315 (*unload_entry)(&main_vm); | |
3316 break; | |
3317 } | |
3318 } | |
3319 } | |
3320 } | |
3321 | |
3322 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
3323 // Invokes JVM_OnLoad | |
3324 void Threads::create_vm_init_libraries() { | |
3325 extern struct JavaVM_ main_vm; | |
3326 AgentLibrary* agent; | |
3327 | |
3328 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
3329 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3330 | |
3331 if (on_load_entry != NULL) { | |
3332 // Invoke the JVM_OnLoad function | |
3333 JavaThread* thread = JavaThread::current(); | |
3334 ThreadToNativeFromVM ttn(thread); | |
3335 HandleMark hm(thread); | |
3336 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3337 if (err != JNI_OK) { | |
3338 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
3339 } | |
3340 } else { | |
3341 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
3342 } | |
3343 } | |
3344 } | |
3345 | |
3346 // Last thread running calls java.lang.Shutdown.shutdown() | |
3347 void JavaThread::invoke_shutdown_hooks() { | |
3348 HandleMark hm(this); | |
3349 | |
3350 // We could get here with a pending exception, if so clear it now. | |
3351 if (this->has_pending_exception()) { | |
3352 this->clear_pending_exception(); | |
3353 } | |
3354 | |
3355 EXCEPTION_MARK; | |
3356 klassOop k = | |
3357 SystemDictionary::resolve_or_null(vmSymbolHandles::java_lang_Shutdown(), | |
3358 THREAD); | |
3359 if (k != NULL) { | |
3360 // SystemDictionary::resolve_or_null will return null if there was | |
3361 // an exception. If we cannot load the Shutdown class, just don't | |
3362 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
3363 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
3364 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
3365 // was called, the Shutdown class would have already been loaded | |
3366 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
3367 instanceKlassHandle shutdown_klass (THREAD, k); | |
3368 JavaValue result(T_VOID); | |
3369 JavaCalls::call_static(&result, | |
3370 shutdown_klass, | |
3371 vmSymbolHandles::shutdown_method_name(), | |
3372 vmSymbolHandles::void_method_signature(), | |
3373 THREAD); | |
3374 } | |
3375 CLEAR_PENDING_EXCEPTION; | |
3376 } | |
3377 | |
3378 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
3379 // the program falls off the end of main(). Another VM exit path is through | |
3380 // vm_exit() when the program calls System.exit() to return a value or when | |
3381 // there is a serious error in VM. The two shutdown paths are not exactly | |
3382 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
3383 // and VM_Exit op at VM level. | |
3384 // | |
3385 // Shutdown sequence: | |
3386 // + Wait until we are the last non-daemon thread to execute | |
3387 // <-- every thing is still working at this moment --> | |
3388 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
3389 // shutdown hooks, run finalizers if finalization-on-exit | |
3390 // + Call before_exit(), prepare for VM exit | |
3391 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
3392 // currently the only user of this mechanism is File.deleteOnExit()) | |
3393 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
3394 // post thread end and vm death events to JVMTI, | |
3395 // stop signal thread | |
3396 // + Call JavaThread::exit(), it will: | |
3397 // > release JNI handle blocks, remove stack guard pages | |
3398 // > remove this thread from Threads list | |
3399 // <-- no more Java code from this thread after this point --> | |
3400 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
3401 // the compiler threads at safepoint | |
3402 // <-- do not use anything that could get blocked by Safepoint --> | |
3403 // + Disable tracing at JNI/JVM barriers | |
3404 // + Set _vm_exited flag for threads that are still running native code | |
3405 // + Delete this thread | |
3406 // + Call exit_globals() | |
3407 // > deletes tty | |
3408 // > deletes PerfMemory resources | |
3409 // + Return to caller | |
3410 | |
3411 bool Threads::destroy_vm() { | |
3412 JavaThread* thread = JavaThread::current(); | |
3413 | |
3414 // Wait until we are the last non-daemon thread to execute | |
3415 { MutexLocker nu(Threads_lock); | |
3416 while (Threads::number_of_non_daemon_threads() > 1 ) | |
3417 // This wait should make safepoint checks, wait without a timeout, | |
3418 // and wait as a suspend-equivalent condition. | |
3419 // | |
3420 // Note: If the FlatProfiler is running and this thread is waiting | |
3421 // for another non-daemon thread to finish, then the FlatProfiler | |
3422 // is waiting for the external suspend request on this thread to | |
3423 // complete. wait_for_ext_suspend_completion() will eventually | |
3424 // timeout, but that takes time. Making this wait a suspend- | |
3425 // equivalent condition solves that timeout problem. | |
3426 // | |
3427 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
3428 Mutex::_as_suspend_equivalent_flag); | |
3429 } | |
3430 | |
3431 // Hang forever on exit if we are reporting an error. | |
3432 if (ShowMessageBoxOnError && is_error_reported()) { | |
3433 os::infinite_sleep(); | |
3434 } | |
3435 | |
3436 if (JDK_Version::is_jdk12x_version()) { | |
3437 // We are the last thread running, so check if finalizers should be run. | |
3438 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
3439 HandleMark rm(thread); | |
3440 Universe::run_finalizers_on_exit(); | |
3441 } else { | |
3442 // run Java level shutdown hooks | |
3443 thread->invoke_shutdown_hooks(); | |
3444 } | |
3445 | |
3446 before_exit(thread); | |
3447 | |
3448 thread->exit(true); | |
3449 | |
3450 // Stop VM thread. | |
3451 { | |
3452 // 4945125 The vm thread comes to a safepoint during exit. | |
3453 // GC vm_operations can get caught at the safepoint, and the | |
3454 // heap is unparseable if they are caught. Grab the Heap_lock | |
3455 // to prevent this. The GC vm_operations will not be able to | |
3456 // queue until after the vm thread is dead. | |
3457 MutexLocker ml(Heap_lock); | |
3458 | |
3459 VMThread::wait_for_vm_thread_exit(); | |
3460 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
3461 VMThread::destroy(); | |
3462 } | |
3463 | |
3464 // clean up ideal graph printers | |
3465 #if defined(COMPILER2) && !defined(PRODUCT) | |
3466 IdealGraphPrinter::clean_up(); | |
3467 #endif | |
3468 | |
3469 // Now, all Java threads are gone except daemon threads. Daemon threads | |
3470 // running Java code or in VM are stopped by the Safepoint. However, | |
3471 // daemon threads executing native code are still running. But they | |
3472 // will be stopped at native=>Java/VM barriers. Note that we can't | |
3473 // simply kill or suspend them, as it is inherently deadlock-prone. | |
3474 | |
3475 #ifndef PRODUCT | |
3476 // disable function tracing at JNI/JVM barriers | |
3477 TraceHPI = false; | |
3478 TraceJNICalls = false; | |
3479 TraceJVMCalls = false; | |
3480 TraceRuntimeCalls = false; | |
3481 #endif | |
3482 | |
3483 VM_Exit::set_vm_exited(); | |
3484 | |
3485 notify_vm_shutdown(); | |
3486 | |
3487 delete thread; | |
3488 | |
3489 // exit_globals() will delete tty | |
3490 exit_globals(); | |
3491 | |
3492 return true; | |
3493 } | |
3494 | |
3495 | |
3496 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
3497 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
3498 return is_supported_jni_version(version); | |
3499 } | |
3500 | |
3501 | |
3502 jboolean Threads::is_supported_jni_version(jint version) { | |
3503 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
3504 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
3505 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
3506 return JNI_FALSE; | |
3507 } | |
3508 | |
3509 | |
3510 void Threads::add(JavaThread* p, bool force_daemon) { | |
3511 // The threads lock must be owned at this point | |
3512 assert_locked_or_safepoint(Threads_lock); | |
3513 p->set_next(_thread_list); | |
3514 _thread_list = p; | |
3515 _number_of_threads++; | |
3516 oop threadObj = p->threadObj(); | |
3517 bool daemon = true; | |
3518 // Bootstrapping problem: threadObj can be null for initial | |
3519 // JavaThread (or for threads attached via JNI) | |
3520 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
3521 _number_of_non_daemon_threads++; | |
3522 daemon = false; | |
3523 } | |
3524 | |
3525 ThreadService::add_thread(p, daemon); | |
3526 | |
3527 // Possible GC point. | |
3528 Events::log("Thread added: " INTPTR_FORMAT, p); | |
3529 } | |
3530 | |
3531 void Threads::remove(JavaThread* p) { | |
3532 // Extra scope needed for Thread_lock, so we can check | |
3533 // that we do not remove thread without safepoint code notice | |
3534 { MutexLocker ml(Threads_lock); | |
3535 | |
3536 assert(includes(p), "p must be present"); | |
3537 | |
3538 JavaThread* current = _thread_list; | |
3539 JavaThread* prev = NULL; | |
3540 | |
3541 while (current != p) { | |
3542 prev = current; | |
3543 current = current->next(); | |
3544 } | |
3545 | |
3546 if (prev) { | |
3547 prev->set_next(current->next()); | |
3548 } else { | |
3549 _thread_list = p->next(); | |
3550 } | |
3551 _number_of_threads--; | |
3552 oop threadObj = p->threadObj(); | |
3553 bool daemon = true; | |
3554 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
3555 _number_of_non_daemon_threads--; | |
3556 daemon = false; | |
3557 | |
3558 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
3559 // on destroy_vm will wake up. | |
3560 if (number_of_non_daemon_threads() == 1) | |
3561 Threads_lock->notify_all(); | |
3562 } | |
3563 ThreadService::remove_thread(p, daemon); | |
3564 | |
3565 // Make sure that safepoint code disregard this thread. This is needed since | |
3566 // the thread might mess around with locks after this point. This can cause it | |
3567 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
3568 // of this thread since it is removed from the queue. | |
3569 p->set_terminated_value(); | |
3570 } // unlock Threads_lock | |
3571 | |
3572 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
3573 Events::log("Thread exited: " INTPTR_FORMAT, p); | |
3574 } | |
3575 | |
3576 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
3577 bool Threads::includes(JavaThread* p) { | |
3578 assert(Threads_lock->is_locked(), "sanity check"); | |
3579 ALL_JAVA_THREADS(q) { | |
3580 if (q == p ) { | |
3581 return true; | |
3582 } | |
3583 } | |
3584 return false; | |
3585 } | |
3586 | |
3587 // Operations on the Threads list for GC. These are not explicitly locked, | |
3588 // but the garbage collector must provide a safe context for them to run. | |
3589 // In particular, these things should never be called when the Threads_lock | |
3590 // is held by some other thread. (Note: the Safepoint abstraction also | |
3591 // uses the Threads_lock to gurantee this property. It also makes sure that | |
3592 // all threads gets blocked when exiting or starting). | |
3593 | |
3594 void Threads::oops_do(OopClosure* f) { | |
3595 ALL_JAVA_THREADS(p) { | |
3596 p->oops_do(f); | |
3597 } | |
3598 VMThread::vm_thread()->oops_do(f); | |
3599 } | |
3600 | |
3601 void Threads::possibly_parallel_oops_do(OopClosure* f) { | |
3602 // Introduce a mechanism allowing parallel threads to claim threads as | |
3603 // root groups. Overhead should be small enough to use all the time, | |
3604 // even in sequential code. | |
3605 SharedHeap* sh = SharedHeap::heap(); | |
3606 bool is_par = (sh->n_par_threads() > 0); | |
3607 int cp = SharedHeap::heap()->strong_roots_parity(); | |
3608 ALL_JAVA_THREADS(p) { | |
3609 if (p->claim_oops_do(is_par, cp)) { | |
3610 p->oops_do(f); | |
3611 } | |
3612 } | |
3613 VMThread* vmt = VMThread::vm_thread(); | |
3614 if (vmt->claim_oops_do(is_par, cp)) | |
3615 vmt->oops_do(f); | |
3616 } | |
3617 | |
3618 #ifndef SERIALGC | |
3619 // Used by ParallelScavenge | |
3620 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
3621 ALL_JAVA_THREADS(p) { | |
3622 q->enqueue(new ThreadRootsTask(p)); | |
3623 } | |
3624 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
3625 } | |
3626 | |
3627 // Used by Parallel Old | |
3628 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
3629 ALL_JAVA_THREADS(p) { | |
3630 q->enqueue(new ThreadRootsMarkingTask(p)); | |
3631 } | |
3632 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
3633 } | |
3634 #endif // SERIALGC | |
3635 | |
3636 void Threads::nmethods_do() { | |
3637 ALL_JAVA_THREADS(p) { | |
3638 p->nmethods_do(); | |
3639 } | |
3640 VMThread::vm_thread()->nmethods_do(); | |
3641 } | |
3642 | |
3643 void Threads::gc_epilogue() { | |
3644 ALL_JAVA_THREADS(p) { | |
3645 p->gc_epilogue(); | |
3646 } | |
3647 } | |
3648 | |
3649 void Threads::gc_prologue() { | |
3650 ALL_JAVA_THREADS(p) { | |
3651 p->gc_prologue(); | |
3652 } | |
3653 } | |
3654 | |
3655 void Threads::deoptimized_wrt_marked_nmethods() { | |
3656 ALL_JAVA_THREADS(p) { | |
3657 p->deoptimized_wrt_marked_nmethods(); | |
3658 } | |
3659 } | |
3660 | |
3661 | |
3662 // Get count Java threads that are waiting to enter the specified monitor. | |
3663 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
3664 address monitor, bool doLock) { | |
3665 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
3666 "must grab Threads_lock or be at safepoint"); | |
3667 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
3668 | |
3669 int i = 0; | |
3670 { | |
3671 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
3672 ALL_JAVA_THREADS(p) { | |
3673 if (p->is_Compiler_thread()) continue; | |
3674 | |
3675 address pending = (address)p->current_pending_monitor(); | |
3676 if (pending == monitor) { // found a match | |
3677 if (i < count) result->append(p); // save the first count matches | |
3678 i++; | |
3679 } | |
3680 } | |
3681 } | |
3682 return result; | |
3683 } | |
3684 | |
3685 | |
3686 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
3687 assert(doLock || | |
3688 Threads_lock->owned_by_self() || | |
3689 SafepointSynchronize::is_at_safepoint(), | |
3690 "must grab Threads_lock or be at safepoint"); | |
3691 | |
3692 // NULL owner means not locked so we can skip the search | |
3693 if (owner == NULL) return NULL; | |
3694 | |
3695 { | |
3696 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
3697 ALL_JAVA_THREADS(p) { | |
3698 // first, see if owner is the address of a Java thread | |
3699 if (owner == (address)p) return p; | |
3700 } | |
3701 } | |
3702 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
3703 if (UseHeavyMonitors) return NULL; | |
3704 | |
3705 // | |
3706 // If we didn't find a matching Java thread and we didn't force use of | |
3707 // heavyweight monitors, then the owner is the stack address of the | |
3708 // Lock Word in the owning Java thread's stack. | |
3709 // | |
3710 // We can't use Thread::is_lock_owned() or Thread::lock_is_in_stack() because | |
3711 // those routines rely on the "current" stack pointer. That would be our | |
3712 // stack pointer which is not relevant to the question. Instead we use the | |
3713 // highest lock ever entered by the thread and find the thread that is | |
3714 // higher than and closest to our target stack address. | |
3715 // | |
3716 address least_diff = 0; | |
3717 bool least_diff_initialized = false; | |
3718 JavaThread* the_owner = NULL; | |
3719 { | |
3720 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
3721 ALL_JAVA_THREADS(q) { | |
3722 address addr = q->highest_lock(); | |
3723 if (addr == NULL || addr < owner) continue; // thread has entered no monitors or is too low | |
3724 address diff = (address)(addr - owner); | |
3725 if (!least_diff_initialized || diff < least_diff) { | |
3726 least_diff_initialized = true; | |
3727 least_diff = diff; | |
3728 the_owner = q; | |
3729 } | |
3730 } | |
3731 } | |
3732 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
3733 return the_owner; | |
3734 } | |
3735 | |
3736 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
3737 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
3738 char buf[32]; | |
3739 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
3740 | |
3741 st->print_cr("Full thread dump %s (%s %s):", | |
3742 Abstract_VM_Version::vm_name(), | |
3743 Abstract_VM_Version::vm_release(), | |
3744 Abstract_VM_Version::vm_info_string() | |
3745 ); | |
3746 st->cr(); | |
3747 | |
3748 #ifndef SERIALGC | |
3749 // Dump concurrent locks | |
3750 ConcurrentLocksDump concurrent_locks; | |
3751 if (print_concurrent_locks) { | |
3752 concurrent_locks.dump_at_safepoint(); | |
3753 } | |
3754 #endif // SERIALGC | |
3755 | |
3756 ALL_JAVA_THREADS(p) { | |
3757 ResourceMark rm; | |
3758 p->print_on(st); | |
3759 if (print_stacks) { | |
3760 if (internal_format) { | |
3761 p->trace_stack(); | |
3762 } else { | |
3763 p->print_stack_on(st); | |
3764 } | |
3765 } | |
3766 st->cr(); | |
3767 #ifndef SERIALGC | |
3768 if (print_concurrent_locks) { | |
3769 concurrent_locks.print_locks_on(p, st); | |
3770 } | |
3771 #endif // SERIALGC | |
3772 } | |
3773 | |
3774 VMThread::vm_thread()->print_on(st); | |
3775 st->cr(); | |
3776 Universe::heap()->print_gc_threads_on(st); | |
3777 WatcherThread* wt = WatcherThread::watcher_thread(); | |
3778 if (wt != NULL) wt->print_on(st); | |
3779 st->cr(); | |
3780 CompileBroker::print_compiler_threads_on(st); | |
3781 st->flush(); | |
3782 } | |
3783 | |
3784 // Threads::print_on_error() is called by fatal error handler. It's possible | |
3785 // that VM is not at safepoint and/or current thread is inside signal handler. | |
3786 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
3787 // memory (even in resource area), it might deadlock the error handler. | |
3788 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
3789 bool found_current = false; | |
3790 st->print_cr("Java Threads: ( => current thread )"); | |
3791 ALL_JAVA_THREADS(thread) { | |
3792 bool is_current = (current == thread); | |
3793 found_current = found_current || is_current; | |
3794 | |
3795 st->print("%s", is_current ? "=>" : " "); | |
3796 | |
3797 st->print(PTR_FORMAT, thread); | |
3798 st->print(" "); | |
3799 thread->print_on_error(st, buf, buflen); | |
3800 st->cr(); | |
3801 } | |
3802 st->cr(); | |
3803 | |
3804 st->print_cr("Other Threads:"); | |
3805 if (VMThread::vm_thread()) { | |
3806 bool is_current = (current == VMThread::vm_thread()); | |
3807 found_current = found_current || is_current; | |
3808 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
3809 | |
3810 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
3811 st->print(" "); | |
3812 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
3813 st->cr(); | |
3814 } | |
3815 WatcherThread* wt = WatcherThread::watcher_thread(); | |
3816 if (wt != NULL) { | |
3817 bool is_current = (current == wt); | |
3818 found_current = found_current || is_current; | |
3819 st->print("%s", is_current ? "=>" : " "); | |
3820 | |
3821 st->print(PTR_FORMAT, wt); | |
3822 st->print(" "); | |
3823 wt->print_on_error(st, buf, buflen); | |
3824 st->cr(); | |
3825 } | |
3826 if (!found_current) { | |
3827 st->cr(); | |
3828 st->print("=>" PTR_FORMAT " (exited) ", current); | |
3829 current->print_on_error(st, buf, buflen); | |
3830 st->cr(); | |
3831 } | |
3832 } | |
3833 | |
3834 | |
3835 // Lifecycle management for TSM ParkEvents. | |
3836 // ParkEvents are type-stable (TSM). | |
3837 // In our particular implementation they happen to be immortal. | |
3838 // | |
3839 // We manage concurrency on the FreeList with a CAS-based | |
3840 // detach-modify-reattach idiom that avoids the ABA problems | |
3841 // that would otherwise be present in a simple CAS-based | |
3842 // push-pop implementation. (push-one and pop-all) | |
3843 // | |
3844 // Caveat: Allocate() and Release() may be called from threads | |
3845 // other than the thread associated with the Event! | |
3846 // If we need to call Allocate() when running as the thread in | |
3847 // question then look for the PD calls to initialize native TLS. | |
3848 // Native TLS (Win32/Linux/Solaris) can only be initialized or | |
3849 // accessed by the associated thread. | |
3850 // See also pd_initialize(). | |
3851 // | |
3852 // Note that we could defer associating a ParkEvent with a thread | |
3853 // until the 1st time the thread calls park(). unpark() calls to | |
3854 // an unprovisioned thread would be ignored. The first park() call | |
3855 // for a thread would allocate and associate a ParkEvent and return | |
3856 // immediately. | |
3857 | |
3858 volatile int ParkEvent::ListLock = 0 ; | |
3859 ParkEvent * volatile ParkEvent::FreeList = NULL ; | |
3860 | |
3861 ParkEvent * ParkEvent::Allocate (Thread * t) { | |
3862 // In rare cases -- JVM_RawMonitor* operations -- we can find t == null. | |
3863 ParkEvent * ev ; | |
3864 | |
3865 // Start by trying to recycle an existing but unassociated | |
3866 // ParkEvent from the global free list. | |
3867 for (;;) { | |
3868 ev = FreeList ; | |
3869 if (ev == NULL) break ; | |
3870 // 1: Detach - sequester or privatize the list | |
3871 // Tantamount to ev = Swap (&FreeList, NULL) | |
3872 if (Atomic::cmpxchg_ptr (NULL, &FreeList, ev) != ev) { | |
3873 continue ; | |
3874 } | |
3875 | |
3876 // We've detached the list. The list in-hand is now | |
3877 // local to this thread. This thread can operate on the | |
3878 // list without risk of interference from other threads. | |
3879 // 2: Extract -- pop the 1st element from the list. | |
3880 ParkEvent * List = ev->FreeNext ; | |
3881 if (List == NULL) break ; | |
3882 for (;;) { | |
3883 // 3: Try to reattach the residual list | |
3884 guarantee (List != NULL, "invariant") ; | |
3885 ParkEvent * Arv = (ParkEvent *) Atomic::cmpxchg_ptr (List, &FreeList, NULL) ; | |
3886 if (Arv == NULL) break ; | |
3887 | |
3888 // New nodes arrived. Try to detach the recent arrivals. | |
3889 if (Atomic::cmpxchg_ptr (NULL, &FreeList, Arv) != Arv) { | |
3890 continue ; | |
3891 } | |
3892 guarantee (Arv != NULL, "invariant") ; | |
3893 // 4: Merge Arv into List | |
3894 ParkEvent * Tail = List ; | |
3895 while (Tail->FreeNext != NULL) Tail = Tail->FreeNext ; | |
3896 Tail->FreeNext = Arv ; | |
3897 } | |
3898 break ; | |
3899 } | |
3900 | |
3901 if (ev != NULL) { | |
3902 guarantee (ev->AssociatedWith == NULL, "invariant") ; | |
3903 } else { | |
3904 // Do this the hard way -- materialize a new ParkEvent. | |
3905 // In rare cases an allocating thread might detach a long list -- | |
3906 // installing null into FreeList -- and then stall or be obstructed. | |
3907 // A 2nd thread calling Allocate() would see FreeList == null. | |
3908 // The list held privately by the 1st thread is unavailable to the 2nd thread. | |
3909 // In that case the 2nd thread would have to materialize a new ParkEvent, | |
3910 // even though free ParkEvents existed in the system. In this case we end up | |
3911 // with more ParkEvents in circulation than we need, but the race is | |
3912 // rare and the outcome is benign. Ideally, the # of extant ParkEvents | |
3913 // is equal to the maximum # of threads that existed at any one time. | |
3914 // Because of the race mentioned above, segments of the freelist | |
3915 // can be transiently inaccessible. At worst we may end up with the | |
3916 // # of ParkEvents in circulation slightly above the ideal. | |
3917 // Note that if we didn't have the TSM/immortal constraint, then | |
3918 // when reattaching, above, we could trim the list. | |
3919 ev = new ParkEvent () ; | |
3920 guarantee ((intptr_t(ev) & 0xFF) == 0, "invariant") ; | |
3921 } | |
3922 ev->reset() ; // courtesy to caller | |
3923 ev->AssociatedWith = t ; // Associate ev with t | |
3924 ev->FreeNext = NULL ; | |
3925 return ev ; | |
3926 } | |
3927 | |
3928 void ParkEvent::Release (ParkEvent * ev) { | |
3929 if (ev == NULL) return ; | |
3930 guarantee (ev->FreeNext == NULL , "invariant") ; | |
3931 ev->AssociatedWith = NULL ; | |
3932 for (;;) { | |
3933 // Push ev onto FreeList | |
3934 // The mechanism is "half" lock-free. | |
3935 ParkEvent * List = FreeList ; | |
3936 ev->FreeNext = List ; | |
3937 if (Atomic::cmpxchg_ptr (ev, &FreeList, List) == List) break ; | |
3938 } | |
3939 } | |
3940 | |
3941 // Override operator new and delete so we can ensure that the | |
3942 // least significant byte of ParkEvent addresses is 0. | |
3943 // Beware that excessive address alignment is undesirable | |
3944 // as it can result in D$ index usage imbalance as | |
3945 // well as bank access imbalance on Niagara-like platforms, | |
3946 // although Niagara's hash function should help. | |
3947 | |
3948 void * ParkEvent::operator new (size_t sz) { | |
3949 return (void *) ((intptr_t (CHeapObj::operator new (sz + 256)) + 256) & -256) ; | |
3950 } | |
3951 | |
3952 void ParkEvent::operator delete (void * a) { | |
3953 // ParkEvents are type-stable and immortal ... | |
3954 ShouldNotReachHere(); | |
3955 } | |
3956 | |
3957 | |
3958 // 6399321 As a temporary measure we copied & modified the ParkEvent:: | |
3959 // allocate() and release() code for use by Parkers. The Parker:: forms | |
3960 // will eventually be removed as we consolide and shift over to ParkEvents | |
3961 // for both builtin synchronization and JSR166 operations. | |
3962 | |
3963 volatile int Parker::ListLock = 0 ; | |
3964 Parker * volatile Parker::FreeList = NULL ; | |
3965 | |
3966 Parker * Parker::Allocate (JavaThread * t) { | |
3967 guarantee (t != NULL, "invariant") ; | |
3968 Parker * p ; | |
3969 | |
3970 // Start by trying to recycle an existing but unassociated | |
3971 // Parker from the global free list. | |
3972 for (;;) { | |
3973 p = FreeList ; | |
3974 if (p == NULL) break ; | |
3975 // 1: Detach | |
3976 // Tantamount to p = Swap (&FreeList, NULL) | |
3977 if (Atomic::cmpxchg_ptr (NULL, &FreeList, p) != p) { | |
3978 continue ; | |
3979 } | |
3980 | |
3981 // We've detached the list. The list in-hand is now | |
3982 // local to this thread. This thread can operate on the | |
3983 // list without risk of interference from other threads. | |
3984 // 2: Extract -- pop the 1st element from the list. | |
3985 Parker * List = p->FreeNext ; | |
3986 if (List == NULL) break ; | |
3987 for (;;) { | |
3988 // 3: Try to reattach the residual list | |
3989 guarantee (List != NULL, "invariant") ; | |
3990 Parker * Arv = (Parker *) Atomic::cmpxchg_ptr (List, &FreeList, NULL) ; | |
3991 if (Arv == NULL) break ; | |
3992 | |
3993 // New nodes arrived. Try to detach the recent arrivals. | |
3994 if (Atomic::cmpxchg_ptr (NULL, &FreeList, Arv) != Arv) { | |
3995 continue ; | |
3996 } | |
3997 guarantee (Arv != NULL, "invariant") ; | |
3998 // 4: Merge Arv into List | |
3999 Parker * Tail = List ; | |
4000 while (Tail->FreeNext != NULL) Tail = Tail->FreeNext ; | |
4001 Tail->FreeNext = Arv ; | |
4002 } | |
4003 break ; | |
4004 } | |
4005 | |
4006 if (p != NULL) { | |
4007 guarantee (p->AssociatedWith == NULL, "invariant") ; | |
4008 } else { | |
4009 // Do this the hard way -- materialize a new Parker.. | |
4010 // In rare cases an allocating thread might detach | |
4011 // a long list -- installing null into FreeList --and | |
4012 // then stall. Another thread calling Allocate() would see | |
4013 // FreeList == null and then invoke the ctor. In this case we | |
4014 // end up with more Parkers in circulation than we need, but | |
4015 // the race is rare and the outcome is benign. | |
4016 // Ideally, the # of extant Parkers is equal to the | |
4017 // maximum # of threads that existed at any one time. | |
4018 // Because of the race mentioned above, segments of the | |
4019 // freelist can be transiently inaccessible. At worst | |
4020 // we may end up with the # of Parkers in circulation | |
4021 // slightly above the ideal. | |
4022 p = new Parker() ; | |
4023 } | |
4024 p->AssociatedWith = t ; // Associate p with t | |
4025 p->FreeNext = NULL ; | |
4026 return p ; | |
4027 } | |
4028 | |
4029 | |
4030 void Parker::Release (Parker * p) { | |
4031 if (p == NULL) return ; | |
4032 guarantee (p->AssociatedWith != NULL, "invariant") ; | |
4033 guarantee (p->FreeNext == NULL , "invariant") ; | |
4034 p->AssociatedWith = NULL ; | |
4035 for (;;) { | |
4036 // Push p onto FreeList | |
4037 Parker * List = FreeList ; | |
4038 p->FreeNext = List ; | |
4039 if (Atomic::cmpxchg_ptr (p, &FreeList, List) == List) break ; | |
4040 } | |
4041 } | |
4042 | |
4043 void Threads::verify() { | |
4044 ALL_JAVA_THREADS(p) { | |
4045 p->verify(); | |
4046 } | |
4047 VMThread* thread = VMThread::vm_thread(); | |
4048 if (thread != NULL) thread->verify(); | |
4049 } |