Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/thread.cpp @ 2044:06f017f7daa7
Merge.
author | Thomas Wuerthinger <wuerthinger@ssw.jku.at> |
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date | Fri, 07 Jan 2011 18:18:08 +0100 |
parents | 2d26b0046e0d 4de5f4101cfd |
children | 91fe28b03d6a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/classLoader.hpp" | |
27 #include "classfile/javaClasses.hpp" | |
28 #include "classfile/systemDictionary.hpp" | |
29 #include "classfile/vmSymbols.hpp" | |
30 #include "code/scopeDesc.hpp" | |
31 #include "compiler/compileBroker.hpp" | |
32 #include "interpreter/interpreter.hpp" | |
33 #include "interpreter/linkResolver.hpp" | |
34 #include "memory/oopFactory.hpp" | |
35 #include "memory/universe.inline.hpp" | |
36 #include "oops/instanceKlass.hpp" | |
37 #include "oops/objArrayOop.hpp" | |
38 #include "oops/oop.inline.hpp" | |
39 #include "oops/symbolOop.hpp" | |
40 #include "prims/jvm_misc.hpp" | |
41 #include "prims/jvmtiExport.hpp" | |
42 #include "prims/jvmtiThreadState.hpp" | |
43 #include "prims/privilegedStack.hpp" | |
44 #include "runtime/aprofiler.hpp" | |
45 #include "runtime/arguments.hpp" | |
46 #include "runtime/biasedLocking.hpp" | |
47 #include "runtime/deoptimization.hpp" | |
48 #include "runtime/fprofiler.hpp" | |
49 #include "runtime/frame.inline.hpp" | |
50 #include "runtime/init.hpp" | |
51 #include "runtime/interfaceSupport.hpp" | |
52 #include "runtime/java.hpp" | |
53 #include "runtime/javaCalls.hpp" | |
54 #include "runtime/jniPeriodicChecker.hpp" | |
55 #include "runtime/memprofiler.hpp" | |
56 #include "runtime/mutexLocker.hpp" | |
57 #include "runtime/objectMonitor.hpp" | |
58 #include "runtime/osThread.hpp" | |
59 #include "runtime/safepoint.hpp" | |
60 #include "runtime/sharedRuntime.hpp" | |
61 #include "runtime/statSampler.hpp" | |
62 #include "runtime/stubRoutines.hpp" | |
63 #include "runtime/task.hpp" | |
64 #include "runtime/threadCritical.hpp" | |
65 #include "runtime/threadLocalStorage.hpp" | |
66 #include "runtime/vframe.hpp" | |
67 #include "runtime/vframeArray.hpp" | |
68 #include "runtime/vframe_hp.hpp" | |
69 #include "runtime/vmThread.hpp" | |
70 #include "runtime/vm_operations.hpp" | |
71 #include "services/attachListener.hpp" | |
72 #include "services/management.hpp" | |
73 #include "services/threadService.hpp" | |
74 #include "utilities/defaultStream.hpp" | |
75 #include "utilities/dtrace.hpp" | |
76 #include "utilities/events.hpp" | |
77 #include "utilities/preserveException.hpp" | |
78 #ifdef TARGET_OS_FAMILY_linux | |
79 # include "os_linux.inline.hpp" | |
80 # include "thread_linux.inline.hpp" | |
81 #endif | |
82 #ifdef TARGET_OS_FAMILY_solaris | |
83 # include "os_solaris.inline.hpp" | |
84 # include "thread_solaris.inline.hpp" | |
85 #endif | |
86 #ifdef TARGET_OS_FAMILY_windows | |
87 # include "os_windows.inline.hpp" | |
88 # include "thread_windows.inline.hpp" | |
89 #endif | |
90 #ifndef SERIALGC | |
91 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
92 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
93 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
94 #endif | |
95 #ifdef COMPILER1 | |
96 #include "c1/c1_Compiler.hpp" | |
97 #endif | |
98 #ifdef COMPILER2 | |
99 #include "opto/c2compiler.hpp" | |
100 #include "opto/idealGraphPrinter.hpp" | |
101 #endif | |
0 | 102 |
103 #ifdef DTRACE_ENABLED | |
104 | |
105 // Only bother with this argument setup if dtrace is available | |
106 | |
107 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); | |
108 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
109 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
110 intptr_t, intptr_t, bool); | |
111 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
112 intptr_t, intptr_t, bool); | |
113 | |
114 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
115 { \ | |
116 ResourceMark rm(this); \ | |
117 int len = 0; \ | |
118 const char* name = (javathread)->get_thread_name(); \ | |
119 len = strlen(name); \ | |
120 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
121 name, len, \ | |
122 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
123 (javathread)->osthread()->thread_id(), \ | |
124 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
125 } | |
126 | |
127 #else // ndef DTRACE_ENABLED | |
128 | |
129 #define DTRACE_THREAD_PROBE(probe, javathread) | |
130 | |
131 #endif // ndef DTRACE_ENABLED | |
132 | |
133 // Class hierarchy | |
134 // - Thread | |
135 // - VMThread | |
136 // - WatcherThread | |
137 // - ConcurrentMarkSweepThread | |
138 // - JavaThread | |
139 // - CompilerThread | |
140 | |
141 // ======= Thread ======== | |
142 | |
143 // Support for forcing alignment of thread objects for biased locking | |
144 void* Thread::operator new(size_t size) { | |
145 if (UseBiasedLocking) { | |
146 const int alignment = markOopDesc::biased_lock_alignment; | |
147 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
148 void* real_malloc_addr = CHeapObj::operator new(aligned_size); | |
149 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); | |
150 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
151 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
152 "JavaThread alignment code overflowed allocated storage"); | |
153 if (TraceBiasedLocking) { | |
154 if (aligned_addr != real_malloc_addr) | |
155 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
156 real_malloc_addr, aligned_addr); | |
157 } | |
158 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
159 return aligned_addr; | |
160 } else { | |
161 return CHeapObj::operator new(size); | |
162 } | |
163 } | |
164 | |
165 void Thread::operator delete(void* p) { | |
166 if (UseBiasedLocking) { | |
167 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
168 CHeapObj::operator delete(real_malloc_addr); | |
169 } else { | |
170 CHeapObj::operator delete(p); | |
171 } | |
172 } | |
173 | |
174 | |
175 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
176 // JavaThread | |
177 | |
178 | |
179 Thread::Thread() { | |
180 // stack | |
181 _stack_base = NULL; | |
182 _stack_size = 0; | |
183 _self_raw_id = 0; | |
184 _lgrp_id = -1; | |
185 _osthread = NULL; | |
186 | |
187 // allocated data structures | |
188 set_resource_area(new ResourceArea()); | |
189 set_handle_area(new HandleArea(NULL)); | |
190 set_active_handles(NULL); | |
191 set_free_handle_block(NULL); | |
192 set_last_handle_mark(NULL); | |
193 set_osthread(NULL); | |
194 | |
195 // This initial value ==> never claimed. | |
196 _oops_do_parity = 0; | |
197 | |
198 // the handle mark links itself to last_handle_mark | |
199 new HandleMark(this); | |
200 | |
201 // plain initialization | |
202 debug_only(_owned_locks = NULL;) | |
203 debug_only(_allow_allocation_count = 0;) | |
204 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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205 NOT_PRODUCT(_skip_gcalot = false;) |
0 | 206 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
207 _jvmti_env_iteration_count = 0; | |
208 _vm_operation_started_count = 0; | |
209 _vm_operation_completed_count = 0; | |
210 _current_pending_monitor = NULL; | |
211 _current_pending_monitor_is_from_java = true; | |
212 _current_waiting_monitor = NULL; | |
213 _num_nested_signal = 0; | |
214 omFreeList = NULL ; | |
215 omFreeCount = 0 ; | |
216 omFreeProvision = 32 ; | |
1587 | 217 omInUseList = NULL ; |
218 omInUseCount = 0 ; | |
0 | 219 |
220 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); | |
221 _suspend_flags = 0; | |
222 | |
223 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
224 _hashStateX = os::random() ; | |
225 _hashStateY = 842502087 ; | |
226 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
227 _hashStateW = 273326509 ; | |
228 | |
229 _OnTrap = 0 ; | |
230 _schedctl = NULL ; | |
231 _Stalled = 0 ; | |
232 _TypeTag = 0x2BAD ; | |
233 | |
234 // Many of the following fields are effectively final - immutable | |
235 // Note that nascent threads can't use the Native Monitor-Mutex | |
236 // construct until the _MutexEvent is initialized ... | |
237 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
238 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
239 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
240 // and ::Release() | |
241 _ParkEvent = ParkEvent::Allocate (this) ; | |
242 _SleepEvent = ParkEvent::Allocate (this) ; | |
243 _MutexEvent = ParkEvent::Allocate (this) ; | |
244 _MuxEvent = ParkEvent::Allocate (this) ; | |
245 | |
246 #ifdef CHECK_UNHANDLED_OOPS | |
247 if (CheckUnhandledOops) { | |
248 _unhandled_oops = new UnhandledOops(this); | |
249 } | |
250 #endif // CHECK_UNHANDLED_OOPS | |
251 #ifdef ASSERT | |
252 if (UseBiasedLocking) { | |
253 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
254 assert(this == _real_malloc_address || | |
255 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
256 "bug in forced alignment of thread objects"); | |
257 } | |
258 #endif /* ASSERT */ | |
259 } | |
260 | |
261 void Thread::initialize_thread_local_storage() { | |
262 // Note: Make sure this method only calls | |
263 // non-blocking operations. Otherwise, it might not work | |
264 // with the thread-startup/safepoint interaction. | |
265 | |
266 // During Java thread startup, safepoint code should allow this | |
267 // method to complete because it may need to allocate memory to | |
268 // store information for the new thread. | |
269 | |
270 // initialize structure dependent on thread local storage | |
271 ThreadLocalStorage::set_thread(this); | |
272 | |
273 // set up any platform-specific state. | |
274 os::initialize_thread(); | |
275 | |
276 } | |
277 | |
278 void Thread::record_stack_base_and_size() { | |
279 set_stack_base(os::current_stack_base()); | |
280 set_stack_size(os::current_stack_size()); | |
281 } | |
282 | |
283 | |
284 Thread::~Thread() { | |
285 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
286 ObjectSynchronizer::omFlush (this) ; | |
287 | |
288 // deallocate data structures | |
289 delete resource_area(); | |
290 // since the handle marks are using the handle area, we have to deallocated the root | |
291 // handle mark before deallocating the thread's handle area, | |
292 assert(last_handle_mark() != NULL, "check we have an element"); | |
293 delete last_handle_mark(); | |
294 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
295 | |
296 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
297 // We NULL out the fields for good hygiene. | |
298 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
299 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
300 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
301 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
302 | |
303 delete handle_area(); | |
304 | |
305 // osthread() can be NULL, if creation of thread failed. | |
306 if (osthread() != NULL) os::free_thread(osthread()); | |
307 | |
308 delete _SR_lock; | |
309 | |
310 // clear thread local storage if the Thread is deleting itself | |
311 if (this == Thread::current()) { | |
312 ThreadLocalStorage::set_thread(NULL); | |
313 } else { | |
314 // In the case where we're not the current thread, invalidate all the | |
315 // caches in case some code tries to get the current thread or the | |
316 // thread that was destroyed, and gets stale information. | |
317 ThreadLocalStorage::invalidate_all(); | |
318 } | |
319 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
320 } | |
321 | |
322 // NOTE: dummy function for assertion purpose. | |
323 void Thread::run() { | |
324 ShouldNotReachHere(); | |
325 } | |
326 | |
327 #ifdef ASSERT | |
328 // Private method to check for dangling thread pointer | |
329 void check_for_dangling_thread_pointer(Thread *thread) { | |
330 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
331 "possibility of dangling Thread pointer"); | |
332 } | |
333 #endif | |
334 | |
335 | |
336 #ifndef PRODUCT | |
337 // Tracing method for basic thread operations | |
338 void Thread::trace(const char* msg, const Thread* const thread) { | |
339 if (!TraceThreadEvents) return; | |
340 ResourceMark rm; | |
341 ThreadCritical tc; | |
342 const char *name = "non-Java thread"; | |
343 int prio = -1; | |
344 if (thread->is_Java_thread() | |
345 && !thread->is_Compiler_thread()) { | |
346 // The Threads_lock must be held to get information about | |
347 // this thread but may not be in some situations when | |
348 // tracing thread events. | |
349 bool release_Threads_lock = false; | |
350 if (!Threads_lock->owned_by_self()) { | |
351 Threads_lock->lock(); | |
352 release_Threads_lock = true; | |
353 } | |
354 JavaThread* jt = (JavaThread *)thread; | |
355 name = (char *)jt->get_thread_name(); | |
356 oop thread_oop = jt->threadObj(); | |
357 if (thread_oop != NULL) { | |
358 prio = java_lang_Thread::priority(thread_oop); | |
359 } | |
360 if (release_Threads_lock) { | |
361 Threads_lock->unlock(); | |
362 } | |
363 } | |
364 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
365 } | |
366 #endif | |
367 | |
368 | |
369 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
370 trace("get priority", thread); | |
371 ThreadPriority priority; | |
372 // Can return an error! | |
373 (void)os::get_priority(thread, priority); | |
374 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
375 return priority; | |
376 } | |
377 | |
378 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
379 trace("set priority", thread); | |
380 debug_only(check_for_dangling_thread_pointer(thread);) | |
381 // Can return an error! | |
382 (void)os::set_priority(thread, priority); | |
383 } | |
384 | |
385 | |
386 void Thread::start(Thread* thread) { | |
387 trace("start", thread); | |
388 // Start is different from resume in that its safety is guaranteed by context or | |
389 // being called from a Java method synchronized on the Thread object. | |
390 if (!DisableStartThread) { | |
391 if (thread->is_Java_thread()) { | |
392 // Initialize the thread state to RUNNABLE before starting this thread. | |
393 // Can not set it after the thread started because we do not know the | |
394 // exact thread state at that time. It could be in MONITOR_WAIT or | |
395 // in SLEEPING or some other state. | |
396 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
397 java_lang_Thread::RUNNABLE); | |
398 } | |
399 os::start_thread(thread); | |
400 } | |
401 } | |
402 | |
403 // Enqueue a VM_Operation to do the job for us - sometime later | |
404 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
405 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
406 VMThread::execute(vm_stop); | |
407 } | |
408 | |
409 | |
410 // | |
411 // Check if an external suspend request has completed (or has been | |
412 // cancelled). Returns true if the thread is externally suspended and | |
413 // false otherwise. | |
414 // | |
415 // The bits parameter returns information about the code path through | |
416 // the routine. Useful for debugging: | |
417 // | |
418 // set in is_ext_suspend_completed(): | |
419 // 0x00000001 - routine was entered | |
420 // 0x00000010 - routine return false at end | |
421 // 0x00000100 - thread exited (return false) | |
422 // 0x00000200 - suspend request cancelled (return false) | |
423 // 0x00000400 - thread suspended (return true) | |
424 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
425 // 0x00002000 - thread is native and walkable (return true) | |
426 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
427 // | |
428 // set in wait_for_ext_suspend_completion(): | |
429 // 0x00010000 - routine was entered | |
430 // 0x00020000 - suspend request cancelled before loop (return false) | |
431 // 0x00040000 - thread suspended before loop (return true) | |
432 // 0x00080000 - suspend request cancelled in loop (return false) | |
433 // 0x00100000 - thread suspended in loop (return true) | |
434 // 0x00200000 - suspend not completed during retry loop (return false) | |
435 // | |
436 | |
437 // Helper class for tracing suspend wait debug bits. | |
438 // | |
439 // 0x00000100 indicates that the target thread exited before it could | |
440 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
441 // 0x00080000 each indicate a cancelled suspend request so they don't | |
442 // count as wait failures either. | |
443 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
444 | |
445 class TraceSuspendDebugBits : public StackObj { | |
446 private: | |
447 JavaThread * jt; | |
448 bool is_wait; | |
449 bool called_by_wait; // meaningful when !is_wait | |
450 uint32_t * bits; | |
451 | |
452 public: | |
453 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
454 uint32_t *_bits) { | |
455 jt = _jt; | |
456 is_wait = _is_wait; | |
457 called_by_wait = _called_by_wait; | |
458 bits = _bits; | |
459 } | |
460 | |
461 ~TraceSuspendDebugBits() { | |
462 if (!is_wait) { | |
463 #if 1 | |
464 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
465 // That trace is very chatty. | |
466 return; | |
467 #else | |
468 if (!called_by_wait) { | |
469 // If tracing for is_ext_suspend_completed() is enabled, then only | |
470 // trace calls to it from wait_for_ext_suspend_completion() | |
471 return; | |
472 } | |
473 #endif | |
474 } | |
475 | |
476 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
477 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
478 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
479 ResourceMark rm; | |
480 | |
481 tty->print_cr( | |
482 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
483 jt->get_thread_name(), *bits); | |
484 | |
485 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
486 } | |
487 } | |
488 } | |
489 }; | |
490 #undef DEBUG_FALSE_BITS | |
491 | |
492 | |
493 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
494 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
495 | |
496 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
497 bool do_trans_retry; // flag to force the retry | |
498 | |
499 *bits |= 0x00000001; | |
500 | |
501 do { | |
502 do_trans_retry = false; | |
503 | |
504 if (is_exiting()) { | |
505 // Thread is in the process of exiting. This is always checked | |
506 // first to reduce the risk of dereferencing a freed JavaThread. | |
507 *bits |= 0x00000100; | |
508 return false; | |
509 } | |
510 | |
511 if (!is_external_suspend()) { | |
512 // Suspend request is cancelled. This is always checked before | |
513 // is_ext_suspended() to reduce the risk of a rogue resume | |
514 // confusing the thread that made the suspend request. | |
515 *bits |= 0x00000200; | |
516 return false; | |
517 } | |
518 | |
519 if (is_ext_suspended()) { | |
520 // thread is suspended | |
521 *bits |= 0x00000400; | |
522 return true; | |
523 } | |
524 | |
525 // Now that we no longer do hard suspends of threads running | |
526 // native code, the target thread can be changing thread state | |
527 // while we are in this routine: | |
528 // | |
529 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
530 // | |
531 // We save a copy of the thread state as observed at this moment | |
532 // and make our decision about suspend completeness based on the | |
533 // copy. This closes the race where the thread state is seen as | |
534 // _thread_in_native_trans in the if-thread_blocked check, but is | |
535 // seen as _thread_blocked in if-thread_in_native_trans check. | |
536 JavaThreadState save_state = thread_state(); | |
537 | |
538 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
539 // If the thread's state is _thread_blocked and this blocking | |
540 // condition is known to be equivalent to a suspend, then we can | |
541 // consider the thread to be externally suspended. This means that | |
542 // the code that sets _thread_blocked has been modified to do | |
543 // self-suspension if the blocking condition releases. We also | |
544 // used to check for CONDVAR_WAIT here, but that is now covered by | |
545 // the _thread_blocked with self-suspension check. | |
546 // | |
547 // Return true since we wouldn't be here unless there was still an | |
548 // external suspend request. | |
549 *bits |= 0x00001000; | |
550 return true; | |
551 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
552 // Threads running native code will self-suspend on native==>VM/Java | |
553 // transitions. If its stack is walkable (should always be the case | |
554 // unless this function is called before the actual java_suspend() | |
555 // call), then the wait is done. | |
556 *bits |= 0x00002000; | |
557 return true; | |
558 } else if (!called_by_wait && !did_trans_retry && | |
559 save_state == _thread_in_native_trans && | |
560 frame_anchor()->walkable()) { | |
561 // The thread is transitioning from thread_in_native to another | |
562 // thread state. check_safepoint_and_suspend_for_native_trans() | |
563 // will force the thread to self-suspend. If it hasn't gotten | |
564 // there yet we may have caught the thread in-between the native | |
565 // code check above and the self-suspend. Lucky us. If we were | |
566 // called by wait_for_ext_suspend_completion(), then it | |
567 // will be doing the retries so we don't have to. | |
568 // | |
569 // Since we use the saved thread state in the if-statement above, | |
570 // there is a chance that the thread has already transitioned to | |
571 // _thread_blocked by the time we get here. In that case, we will | |
572 // make a single unnecessary pass through the logic below. This | |
573 // doesn't hurt anything since we still do the trans retry. | |
574 | |
575 *bits |= 0x00004000; | |
576 | |
577 // Once the thread leaves thread_in_native_trans for another | |
578 // thread state, we break out of this retry loop. We shouldn't | |
579 // need this flag to prevent us from getting back here, but | |
580 // sometimes paranoia is good. | |
581 did_trans_retry = true; | |
582 | |
583 // We wait for the thread to transition to a more usable state. | |
584 for (int i = 1; i <= SuspendRetryCount; i++) { | |
585 // We used to do an "os::yield_all(i)" call here with the intention | |
586 // that yielding would increase on each retry. However, the parameter | |
587 // is ignored on Linux which means the yield didn't scale up. Waiting | |
588 // on the SR_lock below provides a much more predictable scale up for | |
589 // the delay. It also provides a simple/direct point to check for any | |
590 // safepoint requests from the VMThread | |
591 | |
592 // temporarily drops SR_lock while doing wait with safepoint check | |
593 // (if we're a JavaThread - the WatcherThread can also call this) | |
594 // and increase delay with each retry | |
595 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
596 | |
597 // check the actual thread state instead of what we saved above | |
598 if (thread_state() != _thread_in_native_trans) { | |
599 // the thread has transitioned to another thread state so | |
600 // try all the checks (except this one) one more time. | |
601 do_trans_retry = true; | |
602 break; | |
603 } | |
604 } // end retry loop | |
605 | |
606 | |
607 } | |
608 } while (do_trans_retry); | |
609 | |
610 *bits |= 0x00000010; | |
611 return false; | |
612 } | |
613 | |
614 // | |
615 // Wait for an external suspend request to complete (or be cancelled). | |
616 // Returns true if the thread is externally suspended and false otherwise. | |
617 // | |
618 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
619 uint32_t *bits) { | |
620 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
621 false /* !called_by_wait */, bits); | |
622 | |
623 // local flag copies to minimize SR_lock hold time | |
624 bool is_suspended; | |
625 bool pending; | |
626 uint32_t reset_bits; | |
627 | |
628 // set a marker so is_ext_suspend_completed() knows we are the caller | |
629 *bits |= 0x00010000; | |
630 | |
631 // We use reset_bits to reinitialize the bits value at the top of | |
632 // each retry loop. This allows the caller to make use of any | |
633 // unused bits for their own marking purposes. | |
634 reset_bits = *bits; | |
635 | |
636 { | |
637 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
638 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
639 delay, bits); | |
640 pending = is_external_suspend(); | |
641 } | |
642 // must release SR_lock to allow suspension to complete | |
643 | |
644 if (!pending) { | |
645 // A cancelled suspend request is the only false return from | |
646 // is_ext_suspend_completed() that keeps us from entering the | |
647 // retry loop. | |
648 *bits |= 0x00020000; | |
649 return false; | |
650 } | |
651 | |
652 if (is_suspended) { | |
653 *bits |= 0x00040000; | |
654 return true; | |
655 } | |
656 | |
657 for (int i = 1; i <= retries; i++) { | |
658 *bits = reset_bits; // reinit to only track last retry | |
659 | |
660 // We used to do an "os::yield_all(i)" call here with the intention | |
661 // that yielding would increase on each retry. However, the parameter | |
662 // is ignored on Linux which means the yield didn't scale up. Waiting | |
663 // on the SR_lock below provides a much more predictable scale up for | |
664 // the delay. It also provides a simple/direct point to check for any | |
665 // safepoint requests from the VMThread | |
666 | |
667 { | |
668 MutexLocker ml(SR_lock()); | |
669 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
670 // can also call this) and increase delay with each retry | |
671 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
672 | |
673 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
674 delay, bits); | |
675 | |
676 // It is possible for the external suspend request to be cancelled | |
677 // (by a resume) before the actual suspend operation is completed. | |
678 // Refresh our local copy to see if we still need to wait. | |
679 pending = is_external_suspend(); | |
680 } | |
681 | |
682 if (!pending) { | |
683 // A cancelled suspend request is the only false return from | |
684 // is_ext_suspend_completed() that keeps us from staying in the | |
685 // retry loop. | |
686 *bits |= 0x00080000; | |
687 return false; | |
688 } | |
689 | |
690 if (is_suspended) { | |
691 *bits |= 0x00100000; | |
692 return true; | |
693 } | |
694 } // end retry loop | |
695 | |
696 // thread did not suspend after all our retries | |
697 *bits |= 0x00200000; | |
698 return false; | |
699 } | |
700 | |
701 #ifndef PRODUCT | |
702 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
703 | |
704 // This should not need to be atomic as the only way for simultaneous | |
705 // updates is via interrupts. Even then this should be rare or non-existant | |
706 // and we don't care that much anyway. | |
707 | |
708 int index = _jmp_ring_index; | |
709 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
710 _jmp_ring[index]._target = (intptr_t) target; | |
711 _jmp_ring[index]._instruction = (intptr_t) instr; | |
712 _jmp_ring[index]._file = file; | |
713 _jmp_ring[index]._line = line; | |
714 } | |
715 #endif /* PRODUCT */ | |
716 | |
717 // Called by flat profiler | |
718 // Callers have already called wait_for_ext_suspend_completion | |
719 // The assertion for that is currently too complex to put here: | |
720 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
721 bool gotframe = false; | |
722 // self suspension saves needed state. | |
723 if (has_last_Java_frame() && _anchor.walkable()) { | |
724 *_fr = pd_last_frame(); | |
725 gotframe = true; | |
726 } | |
727 return gotframe; | |
728 } | |
729 | |
730 void Thread::interrupt(Thread* thread) { | |
731 trace("interrupt", thread); | |
732 debug_only(check_for_dangling_thread_pointer(thread);) | |
733 os::interrupt(thread); | |
734 } | |
735 | |
736 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
737 trace("is_interrupted", thread); | |
738 debug_only(check_for_dangling_thread_pointer(thread);) | |
739 // Note: If clear_interrupted==false, this simply fetches and | |
740 // returns the value of the field osthread()->interrupted(). | |
741 return os::is_interrupted(thread, clear_interrupted); | |
742 } | |
743 | |
744 | |
745 // GC Support | |
746 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
747 jint thread_parity = _oops_do_parity; | |
748 if (thread_parity != strong_roots_parity) { | |
749 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
750 if (res == thread_parity) return true; | |
751 else { | |
752 guarantee(res == strong_roots_parity, "Or else what?"); | |
753 assert(SharedHeap::heap()->n_par_threads() > 0, | |
754 "Should only fail when parallel."); | |
755 return false; | |
756 } | |
757 } | |
758 assert(SharedHeap::heap()->n_par_threads() > 0, | |
759 "Should only fail when parallel."); | |
760 return false; | |
761 } | |
762 | |
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763 void Thread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 764 active_handles()->oops_do(f); |
765 // Do oop for ThreadShadow | |
766 f->do_oop((oop*)&_pending_exception); | |
767 handle_area()->oops_do(f); | |
768 } | |
769 | |
989
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770 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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771 // no nmethods in a generic thread... |
0 | 772 } |
773 | |
774 void Thread::print_on(outputStream* st) const { | |
775 // get_priority assumes osthread initialized | |
776 if (osthread() != NULL) { | |
777 st->print("prio=%d tid=" INTPTR_FORMAT " ", get_priority(this), this); | |
778 osthread()->print_on(st); | |
779 } | |
780 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
781 } | |
782 | |
783 // Thread::print_on_error() is called by fatal error handler. Don't use | |
784 // any lock or allocate memory. | |
785 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
786 if (is_VM_thread()) st->print("VMThread"); | |
787 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
788 else if (is_Java_thread()) st->print("JavaThread"); | |
789 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
790 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
791 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
792 else st->print("Thread"); | |
793 | |
794 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
795 _stack_base - _stack_size, _stack_base); | |
796 | |
797 if (osthread()) { | |
798 st->print(" [id=%d]", osthread()->thread_id()); | |
799 } | |
800 } | |
801 | |
802 #ifdef ASSERT | |
803 void Thread::print_owned_locks_on(outputStream* st) const { | |
804 Monitor *cur = _owned_locks; | |
805 if (cur == NULL) { | |
806 st->print(" (no locks) "); | |
807 } else { | |
808 st->print_cr(" Locks owned:"); | |
809 while(cur) { | |
810 cur->print_on(st); | |
811 cur = cur->next(); | |
812 } | |
813 } | |
814 } | |
815 | |
816 static int ref_use_count = 0; | |
817 | |
818 bool Thread::owns_locks_but_compiled_lock() const { | |
819 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
820 if (cur != Compile_lock) return true; | |
821 } | |
822 return false; | |
823 } | |
824 | |
825 | |
826 #endif | |
827 | |
828 #ifndef PRODUCT | |
829 | |
830 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
831 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
832 // no threads which allow_vm_block's are held | |
833 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
834 // Check if current thread is allowed to block at a safepoint | |
835 if (!(_allow_safepoint_count == 0)) | |
836 fatal("Possible safepoint reached by thread that does not allow it"); | |
837 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
838 fatal("LEAF method calling lock?"); | |
839 } | |
840 | |
841 #ifdef ASSERT | |
842 if (potential_vm_operation && is_Java_thread() | |
843 && !Universe::is_bootstrapping()) { | |
844 // Make sure we do not hold any locks that the VM thread also uses. | |
845 // This could potentially lead to deadlocks | |
846 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
847 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
848 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
849 // since it is used to transfer control between JavaThreads and the VMThread | |
850 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
851 if ( (cur->allow_vm_block() && | |
852 cur != Threads_lock && | |
853 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
854 cur != VMOperationRequest_lock && | |
855 cur != VMOperationQueue_lock) || | |
856 cur->rank() == Mutex::special) { | |
857 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
858 } | |
859 } | |
860 } | |
861 | |
862 if (GCALotAtAllSafepoints) { | |
863 // We could enter a safepoint here and thus have a gc | |
864 InterfaceSupport::check_gc_alot(); | |
865 } | |
866 #endif | |
867 } | |
868 #endif | |
869 | |
870 bool Thread::is_in_stack(address adr) const { | |
871 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
872 address end = os::current_stack_pointer(); | |
873 if (stack_base() >= adr && adr >= end) return true; | |
874 | |
875 return false; | |
876 } | |
877 | |
878 | |
879 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
880 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
881 // used for compilation in the future. If that change is made, the need for these methods | |
882 // should be revisited, and they should be removed if possible. | |
883 | |
884 bool Thread::is_lock_owned(address adr) const { | |
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885 return on_local_stack(adr); |
0 | 886 } |
887 | |
888 bool Thread::set_as_starting_thread() { | |
889 // NOTE: this must be called inside the main thread. | |
890 return os::create_main_thread((JavaThread*)this); | |
891 } | |
892 | |
893 static void initialize_class(symbolHandle class_name, TRAPS) { | |
894 klassOop klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); | |
895 instanceKlass::cast(klass)->initialize(CHECK); | |
896 } | |
897 | |
898 | |
899 // Creates the initial ThreadGroup | |
900 static Handle create_initial_thread_group(TRAPS) { | |
901 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_ThreadGroup(), true, CHECK_NH); | |
902 instanceKlassHandle klass (THREAD, k); | |
903 | |
904 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
905 { | |
906 JavaValue result(T_VOID); | |
907 JavaCalls::call_special(&result, | |
908 system_instance, | |
909 klass, | |
910 vmSymbolHandles::object_initializer_name(), | |
911 vmSymbolHandles::void_method_signature(), | |
912 CHECK_NH); | |
913 } | |
914 Universe::set_system_thread_group(system_instance()); | |
915 | |
916 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
917 { | |
918 JavaValue result(T_VOID); | |
919 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
920 JavaCalls::call_special(&result, | |
921 main_instance, | |
922 klass, | |
923 vmSymbolHandles::object_initializer_name(), | |
924 vmSymbolHandles::threadgroup_string_void_signature(), | |
925 system_instance, | |
926 string, | |
927 CHECK_NH); | |
928 } | |
929 return main_instance; | |
930 } | |
931 | |
932 // Creates the initial Thread | |
933 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
934 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_Thread(), true, CHECK_NULL); | |
935 instanceKlassHandle klass (THREAD, k); | |
936 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
937 | |
938 java_lang_Thread::set_thread(thread_oop(), thread); | |
939 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
940 thread->set_threadObj(thread_oop()); | |
941 | |
942 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
943 | |
944 JavaValue result(T_VOID); | |
945 JavaCalls::call_special(&result, thread_oop, | |
946 klass, | |
947 vmSymbolHandles::object_initializer_name(), | |
948 vmSymbolHandles::threadgroup_string_void_signature(), | |
949 thread_group, | |
950 string, | |
951 CHECK_NULL); | |
952 return thread_oop(); | |
953 } | |
954 | |
955 static void call_initializeSystemClass(TRAPS) { | |
956 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_System(), true, CHECK); | |
957 instanceKlassHandle klass (THREAD, k); | |
958 | |
959 JavaValue result(T_VOID); | |
960 JavaCalls::call_static(&result, klass, vmSymbolHandles::initializeSystemClass_name(), | |
961 vmSymbolHandles::void_method_signature(), CHECK); | |
962 } | |
963 | |
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964 #ifdef KERNEL |
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965 static void set_jkernel_boot_classloader_hook(TRAPS) { |
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966 klassOop k = SystemDictionary::sun_jkernel_DownloadManager_klass(); |
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967 instanceKlassHandle klass (THREAD, k); |
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968 |
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969 if (k == NULL) { |
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970 // sun.jkernel.DownloadManager may not present in the JDK; just return |
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971 return; |
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972 } |
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973 |
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974 JavaValue result(T_VOID); |
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975 JavaCalls::call_static(&result, klass, vmSymbolHandles::setBootClassLoaderHook_name(), |
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976 vmSymbolHandles::void_method_signature(), CHECK); |
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977 } |
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978 #endif // KERNEL |
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979 |
0 | 980 static void reset_vm_info_property(TRAPS) { |
981 // the vm info string | |
982 ResourceMark rm(THREAD); | |
983 const char *vm_info = VM_Version::vm_info_string(); | |
984 | |
985 // java.lang.System class | |
986 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_System(), true, CHECK); | |
987 instanceKlassHandle klass (THREAD, k); | |
988 | |
989 // setProperty arguments | |
990 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
991 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
992 | |
993 // return value | |
994 JavaValue r(T_OBJECT); | |
995 | |
996 // public static String setProperty(String key, String value); | |
997 JavaCalls::call_static(&r, | |
998 klass, | |
999 vmSymbolHandles::setProperty_name(), | |
1000 vmSymbolHandles::string_string_string_signature(), | |
1001 key_str, | |
1002 value_str, | |
1003 CHECK); | |
1004 } | |
1005 | |
1006 | |
1007 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
1008 assert(thread_group.not_null(), "thread group should be specified"); | |
1009 assert(threadObj() == NULL, "should only create Java thread object once"); | |
1010 | |
1011 klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_Thread(), true, CHECK); | |
1012 instanceKlassHandle klass (THREAD, k); | |
1013 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
1014 | |
1015 java_lang_Thread::set_thread(thread_oop(), this); | |
1016 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1017 set_threadObj(thread_oop()); | |
1018 | |
1019 JavaValue result(T_VOID); | |
1020 if (thread_name != NULL) { | |
1021 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
1022 // Thread gets assigned specified name and null target | |
1023 JavaCalls::call_special(&result, | |
1024 thread_oop, | |
1025 klass, | |
1026 vmSymbolHandles::object_initializer_name(), | |
1027 vmSymbolHandles::threadgroup_string_void_signature(), | |
1028 thread_group, // Argument 1 | |
1029 name, // Argument 2 | |
1030 THREAD); | |
1031 } else { | |
1032 // Thread gets assigned name "Thread-nnn" and null target | |
1033 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
1034 JavaCalls::call_special(&result, | |
1035 thread_oop, | |
1036 klass, | |
1037 vmSymbolHandles::object_initializer_name(), | |
1038 vmSymbolHandles::threadgroup_runnable_void_signature(), | |
1039 thread_group, // Argument 1 | |
1040 Handle(), // Argument 2 | |
1041 THREAD); | |
1042 } | |
1043 | |
1044 | |
1045 if (daemon) { | |
1046 java_lang_Thread::set_daemon(thread_oop()); | |
1047 } | |
1048 | |
1049 if (HAS_PENDING_EXCEPTION) { | |
1050 return; | |
1051 } | |
1052 | |
1142 | 1053 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
0 | 1054 Handle threadObj(this, this->threadObj()); |
1055 | |
1056 JavaCalls::call_special(&result, | |
1057 thread_group, | |
1058 group, | |
1059 vmSymbolHandles::add_method_name(), | |
1060 vmSymbolHandles::thread_void_signature(), | |
1061 threadObj, // Arg 1 | |
1062 THREAD); | |
1063 | |
1064 | |
1065 } | |
1066 | |
1067 // NamedThread -- non-JavaThread subclasses with multiple | |
1068 // uniquely named instances should derive from this. | |
1069 NamedThread::NamedThread() : Thread() { | |
1070 _name = NULL; | |
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1071 _processed_thread = NULL; |
0 | 1072 } |
1073 | |
1074 NamedThread::~NamedThread() { | |
1075 if (_name != NULL) { | |
1076 FREE_C_HEAP_ARRAY(char, _name); | |
1077 _name = NULL; | |
1078 } | |
1079 } | |
1080 | |
1081 void NamedThread::set_name(const char* format, ...) { | |
1082 guarantee(_name == NULL, "Only get to set name once."); | |
1083 _name = NEW_C_HEAP_ARRAY(char, max_name_len); | |
1084 guarantee(_name != NULL, "alloc failure"); | |
1085 va_list ap; | |
1086 va_start(ap, format); | |
1087 jio_vsnprintf(_name, max_name_len, format, ap); | |
1088 va_end(ap); | |
1089 } | |
1090 | |
1091 // ======= WatcherThread ======== | |
1092 | |
1093 // The watcher thread exists to simulate timer interrupts. It should | |
1094 // be replaced by an abstraction over whatever native support for | |
1095 // timer interrupts exists on the platform. | |
1096 | |
1097 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
1681
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1098 volatile bool WatcherThread::_should_terminate = false; |
0 | 1099 |
1100 WatcherThread::WatcherThread() : Thread() { | |
1101 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
1102 if (os::create_thread(this, os::watcher_thread)) { | |
1103 _watcher_thread = this; | |
1104 | |
1105 // Set the watcher thread to the highest OS priority which should not be | |
1106 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
1107 // is created. The only normal thread using this priority is the reference | |
1108 // handler thread, which runs for very short intervals only. | |
1109 // If the VMThread's priority is not lower than the WatcherThread profiling | |
1110 // will be inaccurate. | |
1111 os::set_priority(this, MaxPriority); | |
1112 if (!DisableStartThread) { | |
1113 os::start_thread(this); | |
1114 } | |
1115 } | |
1116 } | |
1117 | |
1118 void WatcherThread::run() { | |
1119 assert(this == watcher_thread(), "just checking"); | |
1120 | |
1121 this->record_stack_base_and_size(); | |
1122 this->initialize_thread_local_storage(); | |
1123 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1124 while(!_should_terminate) { | |
1125 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
1126 assert(watcher_thread() == this, "thread consistency check"); | |
1127 | |
1128 // Calculate how long it'll be until the next PeriodicTask work | |
1129 // should be done, and sleep that amount of time. | |
1681
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1130 size_t time_to_wait = PeriodicTask::time_to_wait(); |
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1131 |
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1132 // we expect this to timeout - we only ever get unparked when |
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1133 // we should terminate |
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1134 { |
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1135 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1136 |
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1137 jlong prev_time = os::javaTimeNanos(); |
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1138 for (;;) { |
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1139 int res= _SleepEvent->park(time_to_wait); |
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1140 if (res == OS_TIMEOUT || _should_terminate) |
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1141 break; |
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1142 // spurious wakeup of some kind |
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1143 jlong now = os::javaTimeNanos(); |
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1144 time_to_wait -= (now - prev_time) / 1000000; |
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1145 if (time_to_wait <= 0) |
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1146 break; |
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1147 prev_time = now; |
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1148 } |
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1149 } |
0 | 1150 |
1151 if (is_error_reported()) { | |
1152 // A fatal error has happened, the error handler(VMError::report_and_die) | |
1153 // should abort JVM after creating an error log file. However in some | |
1154 // rare cases, the error handler itself might deadlock. Here we try to | |
1155 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
1156 // | |
1157 // This code is in WatcherThread because WatcherThread wakes up | |
1158 // periodically so the fatal error handler doesn't need to do anything; | |
1159 // also because the WatcherThread is less likely to crash than other | |
1160 // threads. | |
1161 | |
1162 for (;;) { | |
1163 if (!ShowMessageBoxOnError | |
1164 && (OnError == NULL || OnError[0] == '\0') | |
1165 && Arguments::abort_hook() == NULL) { | |
1166 os::sleep(this, 2 * 60 * 1000, false); | |
1167 fdStream err(defaultStream::output_fd()); | |
1168 err.print_raw_cr("# [ timer expired, abort... ]"); | |
1169 // skip atexit/vm_exit/vm_abort hooks | |
1170 os::die(); | |
1171 } | |
1172 | |
1173 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
1174 // ShowMessageBoxOnError when it is ready to abort. | |
1175 os::sleep(this, 5 * 1000, false); | |
1176 } | |
1177 } | |
1178 | |
1179 PeriodicTask::real_time_tick(time_to_wait); | |
1180 | |
1181 // If we have no more tasks left due to dynamic disenrollment, | |
1182 // shut down the thread since we don't currently support dynamic enrollment | |
1183 if (PeriodicTask::num_tasks() == 0) { | |
1184 _should_terminate = true; | |
1185 } | |
1186 } | |
1187 | |
1188 // Signal that it is terminated | |
1189 { | |
1190 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
1191 _watcher_thread = NULL; | |
1192 Terminator_lock->notify(); | |
1193 } | |
1194 | |
1195 // Thread destructor usually does this.. | |
1196 ThreadLocalStorage::set_thread(NULL); | |
1197 } | |
1198 | |
1199 void WatcherThread::start() { | |
1200 if (watcher_thread() == NULL) { | |
1201 _should_terminate = false; | |
1202 // Create the single instance of WatcherThread | |
1203 new WatcherThread(); | |
1204 } | |
1205 } | |
1206 | |
1207 void WatcherThread::stop() { | |
1208 // it is ok to take late safepoints here, if needed | |
1209 MutexLocker mu(Terminator_lock); | |
1210 _should_terminate = true; | |
1681
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1211 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1212 |
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1213 Thread* watcher = watcher_thread(); |
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1214 if (watcher != NULL) |
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1215 watcher->_SleepEvent->unpark(); |
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1216 |
0 | 1217 while(watcher_thread() != NULL) { |
1218 // This wait should make safepoint checks, wait without a timeout, | |
1219 // and wait as a suspend-equivalent condition. | |
1220 // | |
1221 // Note: If the FlatProfiler is running, then this thread is waiting | |
1222 // for the WatcherThread to terminate and the WatcherThread, via the | |
1223 // FlatProfiler task, is waiting for the external suspend request on | |
1224 // this thread to complete. wait_for_ext_suspend_completion() will | |
1225 // eventually timeout, but that takes time. Making this wait a | |
1226 // suspend-equivalent condition solves that timeout problem. | |
1227 // | |
1228 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
1229 Mutex::_as_suspend_equivalent_flag); | |
1230 } | |
1231 } | |
1232 | |
1233 void WatcherThread::print_on(outputStream* st) const { | |
1234 st->print("\"%s\" ", name()); | |
1235 Thread::print_on(st); | |
1236 st->cr(); | |
1237 } | |
1238 | |
1239 // ======= JavaThread ======== | |
1240 | |
1241 // A JavaThread is a normal Java thread | |
1242 | |
1243 void JavaThread::initialize() { | |
1244 // Initialize fields | |
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1245 |
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1246 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1247 set_claimed_par_id(-1); |
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1248 |
0 | 1249 set_saved_exception_pc(NULL); |
1250 set_threadObj(NULL); | |
1251 _anchor.clear(); | |
1252 set_entry_point(NULL); | |
1253 set_jni_functions(jni_functions()); | |
1254 set_callee_target(NULL); | |
1255 set_vm_result(NULL); | |
1256 set_vm_result_2(NULL); | |
1257 set_vframe_array_head(NULL); | |
1258 set_vframe_array_last(NULL); | |
1259 set_deferred_locals(NULL); | |
1260 set_deopt_mark(NULL); | |
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1261 set_deopt_nmethod(NULL); |
0 | 1262 clear_must_deopt_id(); |
1263 set_monitor_chunks(NULL); | |
1264 set_next(NULL); | |
1265 set_thread_state(_thread_new); | |
1266 _terminated = _not_terminated; | |
1267 _privileged_stack_top = NULL; | |
1268 _array_for_gc = NULL; | |
1269 _suspend_equivalent = false; | |
1270 _in_deopt_handler = 0; | |
1271 _doing_unsafe_access = false; | |
1272 _stack_guard_state = stack_guard_unused; | |
1273 _exception_oop = NULL; | |
1274 _exception_pc = 0; | |
1275 _exception_handler_pc = 0; | |
1276 _exception_stack_size = 0; | |
1903 | 1277 _is_method_handle_return = 0; |
0 | 1278 _jvmti_thread_state= NULL; |
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1279 _should_post_on_exceptions_flag = JNI_FALSE; |
0 | 1280 _jvmti_get_loaded_classes_closure = NULL; |
1281 _interp_only_mode = 0; | |
1282 _special_runtime_exit_condition = _no_async_condition; | |
1283 _pending_async_exception = NULL; | |
1284 _is_compiling = false; | |
1285 _thread_stat = NULL; | |
1286 _thread_stat = new ThreadStatistics(); | |
1287 _blocked_on_compilation = false; | |
1288 _jni_active_critical = 0; | |
1289 _do_not_unlock_if_synchronized = false; | |
1290 _cached_monitor_info = NULL; | |
1291 _parker = Parker::Allocate(this) ; | |
1292 | |
1293 #ifndef PRODUCT | |
1294 _jmp_ring_index = 0; | |
1295 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
1296 record_jump(NULL, NULL, NULL, 0); | |
1297 } | |
1298 #endif /* PRODUCT */ | |
1299 | |
1300 set_thread_profiler(NULL); | |
1301 if (FlatProfiler::is_active()) { | |
1302 // This is where we would decide to either give each thread it's own profiler | |
1303 // or use one global one from FlatProfiler, | |
1304 // or up to some count of the number of profiled threads, etc. | |
1305 ThreadProfiler* pp = new ThreadProfiler(); | |
1306 pp->engage(); | |
1307 set_thread_profiler(pp); | |
1308 } | |
1309 | |
1310 // Setup safepoint state info for this thread | |
1311 ThreadSafepointState::create(this); | |
1312 | |
1313 debug_only(_java_call_counter = 0); | |
1314 | |
1315 // JVMTI PopFrame support | |
1316 _popframe_condition = popframe_inactive; | |
1317 _popframe_preserved_args = NULL; | |
1318 _popframe_preserved_args_size = 0; | |
1319 | |
1320 pd_initialize(); | |
1321 } | |
1322 | |
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1323 #ifndef SERIALGC |
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1324 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1325 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1326 #endif // !SERIALGC |
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1327 |
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1328 JavaThread::JavaThread(bool is_attaching) : |
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1329 Thread() |
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1330 #ifndef SERIALGC |
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1331 , _satb_mark_queue(&_satb_mark_queue_set), |
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1332 _dirty_card_queue(&_dirty_card_queue_set) |
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1333 #endif // !SERIALGC |
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1334 { |
0 | 1335 initialize(); |
1336 _is_attaching = is_attaching; | |
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1337 assert(_deferred_card_mark.is_empty(), "Default MemRegion ctor"); |
0 | 1338 } |
1339 | |
1340 bool JavaThread::reguard_stack(address cur_sp) { | |
1341 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
1342 return true; // Stack already guarded or guard pages not needed. | |
1343 } | |
1344 | |
1345 if (register_stack_overflow()) { | |
1346 // For those architectures which have separate register and | |
1347 // memory stacks, we must check the register stack to see if | |
1348 // it has overflowed. | |
1349 return false; | |
1350 } | |
1351 | |
1352 // Java code never executes within the yellow zone: the latter is only | |
1353 // there to provoke an exception during stack banging. If java code | |
1354 // is executing there, either StackShadowPages should be larger, or | |
1355 // some exception code in c1, c2 or the interpreter isn't unwinding | |
1356 // when it should. | |
1357 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
1358 | |
1359 enable_stack_yellow_zone(); | |
1360 return true; | |
1361 } | |
1362 | |
1363 bool JavaThread::reguard_stack(void) { | |
1364 return reguard_stack(os::current_stack_pointer()); | |
1365 } | |
1366 | |
1367 | |
1368 void JavaThread::block_if_vm_exited() { | |
1369 if (_terminated == _vm_exited) { | |
1370 // _vm_exited is set at safepoint, and Threads_lock is never released | |
1371 // we will block here forever | |
1372 Threads_lock->lock_without_safepoint_check(); | |
1373 ShouldNotReachHere(); | |
1374 } | |
1375 } | |
1376 | |
1377 | |
1378 // Remove this ifdef when C1 is ported to the compiler interface. | |
1379 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
1380 | |
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1381 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1382 Thread() |
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1383 #ifndef SERIALGC |
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1384 , _satb_mark_queue(&_satb_mark_queue_set), |
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1385 _dirty_card_queue(&_dirty_card_queue_set) |
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1386 #endif // !SERIALGC |
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1387 { |
0 | 1388 if (TraceThreadEvents) { |
1389 tty->print_cr("creating thread %p", this); | |
1390 } | |
1391 initialize(); | |
1392 _is_attaching = false; | |
1393 set_entry_point(entry_point); | |
1394 // Create the native thread itself. | |
1395 // %note runtime_23 | |
1396 os::ThreadType thr_type = os::java_thread; | |
1397 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
1398 os::java_thread; | |
1399 os::create_thread(this, thr_type, stack_sz); | |
1400 | |
1401 // The _osthread may be NULL here because we ran out of memory (too many threads active). | |
1402 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
1403 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
1404 // the exception consists of creating the exception object & initializing it, initialization | |
1405 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
1406 // | |
1407 // The thread is still suspended when we reach here. Thread must be explicit started | |
1408 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
1409 // by calling Threads:add. The reason why this is not done here, is because the thread | |
1410 // object must be fully initialized (take a look at JVM_Start) | |
1411 } | |
1412 | |
1413 JavaThread::~JavaThread() { | |
1414 if (TraceThreadEvents) { | |
1415 tty->print_cr("terminate thread %p", this); | |
1416 } | |
1417 | |
1418 // JSR166 -- return the parker to the free list | |
1419 Parker::Release(_parker); | |
1420 _parker = NULL ; | |
1421 | |
1422 // Free any remaining previous UnrollBlock | |
1423 vframeArray* old_array = vframe_array_last(); | |
1424 | |
1425 if (old_array != NULL) { | |
1426 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
1427 old_array->set_unroll_block(NULL); | |
1428 delete old_info; | |
1429 delete old_array; | |
1430 } | |
1431 | |
1432 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
1433 if (deferred != NULL) { | |
1434 // This can only happen if thread is destroyed before deoptimization occurs. | |
1435 assert(deferred->length() != 0, "empty array!"); | |
1436 do { | |
1437 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
1438 deferred->remove_at(0); | |
1439 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
1440 delete dlv; | |
1441 } while (deferred->length() != 0); | |
1442 delete deferred; | |
1443 } | |
1444 | |
1445 // All Java related clean up happens in exit | |
1446 ThreadSafepointState::destroy(this); | |
1447 if (_thread_profiler != NULL) delete _thread_profiler; | |
1448 if (_thread_stat != NULL) delete _thread_stat; | |
1449 } | |
1450 | |
1451 | |
1452 // The first routine called by a new Java thread | |
1453 void JavaThread::run() { | |
1454 // initialize thread-local alloc buffer related fields | |
1455 this->initialize_tlab(); | |
1456 | |
1457 // used to test validitity of stack trace backs | |
1458 this->record_base_of_stack_pointer(); | |
1459 | |
1460 // Record real stack base and size. | |
1461 this->record_stack_base_and_size(); | |
1462 | |
1463 // Initialize thread local storage; set before calling MutexLocker | |
1464 this->initialize_thread_local_storage(); | |
1465 | |
1466 this->create_stack_guard_pages(); | |
1467 | |
1681
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1468 this->cache_global_variables(); |
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1469 |
0 | 1470 // Thread is now sufficient initialized to be handled by the safepoint code as being |
1471 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
1472 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
1473 | |
1474 assert(JavaThread::current() == this, "sanity check"); | |
1475 assert(!Thread::current()->owns_locks(), "sanity check"); | |
1476 | |
1477 DTRACE_THREAD_PROBE(start, this); | |
1478 | |
1479 // This operation might block. We call that after all safepoint checks for a new thread has | |
1480 // been completed. | |
1481 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1482 | |
1483 if (JvmtiExport::should_post_thread_life()) { | |
1484 JvmtiExport::post_thread_start(this); | |
1485 } | |
1486 | |
1487 // We call another function to do the rest so we are sure that the stack addresses used | |
1488 // from there will be lower than the stack base just computed | |
1489 thread_main_inner(); | |
1490 | |
1491 // Note, thread is no longer valid at this point! | |
1492 } | |
1493 | |
1494 | |
1495 void JavaThread::thread_main_inner() { | |
1496 assert(JavaThread::current() == this, "sanity check"); | |
1497 assert(this->threadObj() != NULL, "just checking"); | |
1498 | |
1499 // Execute thread entry point. If this thread is being asked to restart, | |
1500 // or has been stopped before starting, do not reexecute entry point. | |
1501 // Note: Due to JVM_StopThread we can have pending exceptions already! | |
1502 if (!this->has_pending_exception() && !java_lang_Thread::is_stillborn(this->threadObj())) { | |
1503 // enter the thread's entry point only if we have no pending exceptions | |
1504 HandleMark hm(this); | |
1505 this->entry_point()(this, this); | |
1506 } | |
1507 | |
1508 DTRACE_THREAD_PROBE(stop, this); | |
1509 | |
1510 this->exit(false); | |
1511 delete this; | |
1512 } | |
1513 | |
1514 | |
1515 static void ensure_join(JavaThread* thread) { | |
1516 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
1517 Handle threadObj(thread, thread->threadObj()); | |
1518 assert(threadObj.not_null(), "java thread object must exist"); | |
1519 ObjectLocker lock(threadObj, thread); | |
1520 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1521 thread->clear_pending_exception(); | |
1522 // It is of profound importance that we set the stillborn bit and reset the thread object, | |
1523 // before we do the notify. Since, changing these two variable will make JVM_IsAlive return | |
1524 // false. So in case another thread is doing a join on this thread , it will detect that the thread | |
1525 // is dead when it gets notified. | |
1526 java_lang_Thread::set_stillborn(threadObj()); | |
1527 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
1528 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
1529 java_lang_Thread::set_thread(threadObj(), NULL); | |
1530 lock.notify_all(thread); | |
1531 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1532 thread->clear_pending_exception(); | |
1533 } | |
1534 | |
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1535 |
0 | 1536 // For any new cleanup additions, please check to see if they need to be applied to |
1537 // cleanup_failed_attach_current_thread as well. | |
1538 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
1539 assert(this == JavaThread::current(), "thread consistency check"); | |
1540 if (!InitializeJavaLangSystem) return; | |
1541 | |
1542 HandleMark hm(this); | |
1543 Handle uncaught_exception(this, this->pending_exception()); | |
1544 this->clear_pending_exception(); | |
1545 Handle threadObj(this, this->threadObj()); | |
1546 assert(threadObj.not_null(), "Java thread object should be created"); | |
1547 | |
1548 if (get_thread_profiler() != NULL) { | |
1549 get_thread_profiler()->disengage(); | |
1550 ResourceMark rm; | |
1551 get_thread_profiler()->print(get_thread_name()); | |
1552 } | |
1553 | |
1554 | |
1555 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
1556 { | |
1557 EXCEPTION_MARK; | |
1558 | |
1559 CLEAR_PENDING_EXCEPTION; | |
1560 } | |
1561 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
1562 // has to be fixed by a runtime query method | |
1563 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
1564 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
1565 // java.lang.Thread.dispatchUncaughtException | |
1566 if (uncaught_exception.not_null()) { | |
1567 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
1568 Events::log("uncaught exception INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT", | |
1569 (address)uncaught_exception(), (address)threadObj(), (address)group()); | |
1570 { | |
1571 EXCEPTION_MARK; | |
1572 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
1573 // call it. Otherwise we have an older library without the JSR-166 changes, | |
1574 // so call ThreadGroup.uncaughtException() | |
1575 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
1576 CallInfo callinfo; | |
1142 | 1577 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1578 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
1579 vmSymbolHandles::dispatchUncaughtException_name(), | |
1580 vmSymbolHandles::throwable_void_signature(), | |
1581 KlassHandle(), false, false, THREAD); | |
1582 CLEAR_PENDING_EXCEPTION; | |
1583 methodHandle method = callinfo.selected_method(); | |
1584 if (method.not_null()) { | |
1585 JavaValue result(T_VOID); | |
1586 JavaCalls::call_virtual(&result, | |
1587 threadObj, thread_klass, | |
1588 vmSymbolHandles::dispatchUncaughtException_name(), | |
1589 vmSymbolHandles::throwable_void_signature(), | |
1590 uncaught_exception, | |
1591 THREAD); | |
1592 } else { | |
1142 | 1593 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
0 | 1594 JavaValue result(T_VOID); |
1595 JavaCalls::call_virtual(&result, | |
1596 group, thread_group, | |
1597 vmSymbolHandles::uncaughtException_name(), | |
1598 vmSymbolHandles::thread_throwable_void_signature(), | |
1599 threadObj, // Arg 1 | |
1600 uncaught_exception, // Arg 2 | |
1601 THREAD); | |
1602 } | |
1603 CLEAR_PENDING_EXCEPTION; | |
1604 } | |
1605 } | |
1606 | |
1607 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during | |
1608 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
1609 // is deprecated anyhow. | |
1610 { int count = 3; | |
1611 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
1612 EXCEPTION_MARK; | |
1613 JavaValue result(T_VOID); | |
1142 | 1614 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1615 JavaCalls::call_virtual(&result, |
1616 threadObj, thread_klass, | |
1617 vmSymbolHandles::exit_method_name(), | |
1618 vmSymbolHandles::void_method_signature(), | |
1619 THREAD); | |
1620 CLEAR_PENDING_EXCEPTION; | |
1621 } | |
1622 } | |
1623 | |
1624 // notify JVMTI | |
1625 if (JvmtiExport::should_post_thread_life()) { | |
1626 JvmtiExport::post_thread_end(this); | |
1627 } | |
1628 | |
1629 // We have notified the agents that we are exiting, before we go on, | |
1630 // we must check for a pending external suspend request and honor it | |
1631 // in order to not surprise the thread that made the suspend request. | |
1632 while (true) { | |
1633 { | |
1634 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1635 if (!is_external_suspend()) { | |
1636 set_terminated(_thread_exiting); | |
1637 ThreadService::current_thread_exiting(this); | |
1638 break; | |
1639 } | |
1640 // Implied else: | |
1641 // Things get a little tricky here. We have a pending external | |
1642 // suspend request, but we are holding the SR_lock so we | |
1643 // can't just self-suspend. So we temporarily drop the lock | |
1644 // and then self-suspend. | |
1645 } | |
1646 | |
1647 ThreadBlockInVM tbivm(this); | |
1648 java_suspend_self(); | |
1649 | |
1650 // We're done with this suspend request, but we have to loop around | |
1651 // and check again. Eventually we will get SR_lock without a pending | |
1652 // external suspend request and will be able to mark ourselves as | |
1653 // exiting. | |
1654 } | |
1655 // no more external suspends are allowed at this point | |
1656 } else { | |
1657 // before_exit() has already posted JVMTI THREAD_END events | |
1658 } | |
1659 | |
1660 // Notify waiters on thread object. This has to be done after exit() is called | |
1661 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
1662 // group should have the destroyed bit set before waiters are notified). | |
1663 ensure_join(this); | |
1664 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
1665 | |
1666 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
1667 // held by this thread must be released. A detach operation must only | |
1668 // get here if there are no Java frames on the stack. Therefore, any | |
1669 // owned monitors at this point MUST be JNI-acquired monitors which are | |
1670 // pre-inflated and in the monitor cache. | |
1671 // | |
1672 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
1673 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
1674 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
1675 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
1676 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
1677 } | |
1678 | |
1679 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
1680 // is in a consistent state, in case GC happens | |
1681 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
1682 | |
1683 if (active_handles() != NULL) { | |
1684 JNIHandleBlock* block = active_handles(); | |
1685 set_active_handles(NULL); | |
1686 JNIHandleBlock::release_block(block); | |
1687 } | |
1688 | |
1689 if (free_handle_block() != NULL) { | |
1690 JNIHandleBlock* block = free_handle_block(); | |
1691 set_free_handle_block(NULL); | |
1692 JNIHandleBlock::release_block(block); | |
1693 } | |
1694 | |
1695 // These have to be removed while this is still a valid thread. | |
1696 remove_stack_guard_pages(); | |
1697 | |
1698 if (UseTLAB) { | |
1699 tlab().make_parsable(true); // retire TLAB | |
1700 } | |
1701 | |
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1702 if (jvmti_thread_state() != NULL) { |
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1703 JvmtiExport::cleanup_thread(this); |
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1704 } |
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1705 |
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1706 #ifndef SERIALGC |
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1707 // We must flush G1-related buffers before removing a thread from |
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1708 // the list of active threads. |
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1709 if (UseG1GC) { |
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1710 flush_barrier_queues(); |
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1711 } |
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1712 #endif |
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1713 |
0 | 1714 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
1715 Threads::remove(this); | |
1716 } | |
1717 | |
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1718 #ifndef SERIALGC |
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1719 // Flush G1-related queues. |
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1720 void JavaThread::flush_barrier_queues() { |
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1721 satb_mark_queue().flush(); |
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1722 dirty_card_queue().flush(); |
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1723 } |
1842
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1724 |
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1725 void JavaThread::initialize_queues() { |
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1726 assert(!SafepointSynchronize::is_at_safepoint(), |
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1727 "we should not be at a safepoint"); |
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1728 |
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1729 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1730 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1731 // The SATB queue should have been constructed with its active |
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1732 // field set to false. |
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1733 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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1734 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1735 // If we are creating the thread during a marking cycle, we should |
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1736 // set the active field of the SATB queue to true. |
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1737 if (satb_queue_set.is_active()) { |
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1738 satb_queue.set_active(true); |
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1739 } |
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1740 |
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1741 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1742 // The dirty card queue should have been constructed with its |
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1743 // active field set to true. |
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1744 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1745 } |
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1746 #endif // !SERIALGC |
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1747 |
0 | 1748 void JavaThread::cleanup_failed_attach_current_thread() { |
441
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1749 if (get_thread_profiler() != NULL) { |
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1750 get_thread_profiler()->disengage(); |
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1751 ResourceMark rm; |
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1752 get_thread_profiler()->print(get_thread_name()); |
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1753 } |
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1754 |
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1755 if (active_handles() != NULL) { |
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1756 JNIHandleBlock* block = active_handles(); |
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1757 set_active_handles(NULL); |
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1758 JNIHandleBlock::release_block(block); |
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1759 } |
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1760 |
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1761 if (free_handle_block() != NULL) { |
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1762 JNIHandleBlock* block = free_handle_block(); |
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1763 set_free_handle_block(NULL); |
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1764 JNIHandleBlock::release_block(block); |
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1765 } |
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1766 |
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1767 // These have to be removed while this is still a valid thread. |
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1768 remove_stack_guard_pages(); |
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1769 |
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1770 if (UseTLAB) { |
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1771 tlab().make_parsable(true); // retire TLAB, if any |
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1772 } |
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1773 |
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1774 #ifndef SERIALGC |
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1775 if (UseG1GC) { |
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1776 flush_barrier_queues(); |
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1777 } |
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1778 #endif |
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1779 |
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1780 Threads::remove(this); |
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1781 delete this; |
0 | 1782 } |
1783 | |
1784 | |
441
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1785 |
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1786 |
0 | 1787 JavaThread* JavaThread::active() { |
1788 Thread* thread = ThreadLocalStorage::thread(); | |
1789 assert(thread != NULL, "just checking"); | |
1790 if (thread->is_Java_thread()) { | |
1791 return (JavaThread*) thread; | |
1792 } else { | |
1793 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
1794 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
1795 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
1796 assert(ret->is_Java_thread(), "must be a Java thread"); | |
1797 return ret; | |
1798 } | |
1799 } | |
1800 | |
1801 bool JavaThread::is_lock_owned(address adr) const { | |
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1802 if (Thread::is_lock_owned(adr)) return true; |
0 | 1803 |
1804 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
1805 if (chunk->contains(adr)) return true; | |
1806 } | |
1807 | |
1808 return false; | |
1809 } | |
1810 | |
1811 | |
1812 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
1813 chunk->set_next(monitor_chunks()); | |
1814 set_monitor_chunks(chunk); | |
1815 } | |
1816 | |
1817 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
1818 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
1819 if (monitor_chunks() == chunk) { | |
1820 set_monitor_chunks(chunk->next()); | |
1821 } else { | |
1822 MonitorChunk* prev = monitor_chunks(); | |
1823 while (prev->next() != chunk) prev = prev->next(); | |
1824 prev->set_next(chunk->next()); | |
1825 } | |
1826 } | |
1827 | |
1828 // JVM support. | |
1829 | |
1830 // Note: this function shouldn't block if it's called in | |
1831 // _thread_in_native_trans state (such as from | |
1832 // check_special_condition_for_native_trans()). | |
1833 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
1834 | |
1835 if (has_last_Java_frame() && has_async_condition()) { | |
1836 // If we are at a polling page safepoint (not a poll return) | |
1837 // then we must defer async exception because live registers | |
1838 // will be clobbered by the exception path. Poll return is | |
1839 // ok because the call we a returning from already collides | |
1840 // with exception handling registers and so there is no issue. | |
1841 // (The exception handling path kills call result registers but | |
1842 // this is ok since the exception kills the result anyway). | |
1843 | |
1844 if (is_at_poll_safepoint()) { | |
1845 // if the code we are returning to has deoptimized we must defer | |
1846 // the exception otherwise live registers get clobbered on the | |
1847 // exception path before deoptimization is able to retrieve them. | |
1848 // | |
1849 RegisterMap map(this, false); | |
1850 frame caller_fr = last_frame().sender(&map); | |
1851 assert(caller_fr.is_compiled_frame(), "what?"); | |
1852 if (caller_fr.is_deoptimized_frame()) { | |
1853 if (TraceExceptions) { | |
1854 ResourceMark rm; | |
1855 tty->print_cr("deferred async exception at compiled safepoint"); | |
1856 } | |
1857 return; | |
1858 } | |
1859 } | |
1860 } | |
1861 | |
1862 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
1863 if (condition == _no_async_condition) { | |
1864 // Conditions have changed since has_special_runtime_exit_condition() | |
1865 // was called: | |
1866 // - if we were here only because of an external suspend request, | |
1867 // then that was taken care of above (or cancelled) so we are done | |
1868 // - if we were here because of another async request, then it has | |
1869 // been cleared between the has_special_runtime_exit_condition() | |
1870 // and now so again we are done | |
1871 return; | |
1872 } | |
1873 | |
1874 // Check for pending async. exception | |
1875 if (_pending_async_exception != NULL) { | |
1876 // Only overwrite an already pending exception, if it is not a threadDeath. | |
1142 | 1877 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 1878 |
1879 // We cannot call Exceptions::_throw(...) here because we cannot block | |
1880 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
1881 | |
1882 if (TraceExceptions) { | |
1883 ResourceMark rm; | |
1884 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
1885 if (has_last_Java_frame() ) { | |
1886 frame f = last_frame(); | |
1887 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
1888 } | |
1889 tty->print_cr(" of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
1890 } | |
1891 _pending_async_exception = NULL; | |
1892 clear_has_async_exception(); | |
1893 } | |
1894 } | |
1895 | |
1896 if (check_unsafe_error && | |
1897 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
1898 condition = _no_async_condition; // done | |
1899 switch (thread_state()) { | |
1900 case _thread_in_vm: | |
1901 { | |
1902 JavaThread* THREAD = this; | |
1903 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
1904 } | |
1905 case _thread_in_native: | |
1906 { | |
1907 ThreadInVMfromNative tiv(this); | |
1908 JavaThread* THREAD = this; | |
1909 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
1910 } | |
1911 case _thread_in_Java: | |
1912 { | |
1913 ThreadInVMfromJava tiv(this); | |
1914 JavaThread* THREAD = this; | |
1915 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
1916 } | |
1917 default: | |
1918 ShouldNotReachHere(); | |
1919 } | |
1920 } | |
1921 | |
1922 assert(condition == _no_async_condition || has_pending_exception() || | |
1923 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
1924 "must have handled the async condition, if no exception"); | |
1925 } | |
1926 | |
1927 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
1928 // | |
1929 // Check for pending external suspend. Internal suspend requests do | |
1930 // not use handle_special_runtime_exit_condition(). | |
1931 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
1932 // thread is not the current thread. In older versions of jdbx, jdbx | |
1933 // threads could call into the VM with another thread's JNIEnv so we | |
1934 // can be here operating on behalf of a suspended thread (4432884). | |
1935 bool do_self_suspend = is_external_suspend_with_lock(); | |
1936 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
1937 // | |
1938 // Because thread is external suspended the safepoint code will count | |
1939 // thread as at a safepoint. This can be odd because we can be here | |
1940 // as _thread_in_Java which would normally transition to _thread_blocked | |
1941 // at a safepoint. We would like to mark the thread as _thread_blocked | |
1942 // before calling java_suspend_self like all other callers of it but | |
1943 // we must then observe proper safepoint protocol. (We can't leave | |
1944 // _thread_blocked with a safepoint in progress). However we can be | |
1945 // here as _thread_in_native_trans so we can't use a normal transition | |
1946 // constructor/destructor pair because they assert on that type of | |
1947 // transition. We could do something like: | |
1948 // | |
1949 // JavaThreadState state = thread_state(); | |
1950 // set_thread_state(_thread_in_vm); | |
1951 // { | |
1952 // ThreadBlockInVM tbivm(this); | |
1953 // java_suspend_self() | |
1954 // } | |
1955 // set_thread_state(_thread_in_vm_trans); | |
1956 // if (safepoint) block; | |
1957 // set_thread_state(state); | |
1958 // | |
1959 // but that is pretty messy. Instead we just go with the way the | |
1960 // code has worked before and note that this is the only path to | |
1961 // java_suspend_self that doesn't put the thread in _thread_blocked | |
1962 // mode. | |
1963 | |
1964 frame_anchor()->make_walkable(this); | |
1965 java_suspend_self(); | |
1966 | |
1967 // We might be here for reasons in addition to the self-suspend request | |
1968 // so check for other async requests. | |
1969 } | |
1970 | |
1971 if (check_asyncs) { | |
1972 check_and_handle_async_exceptions(); | |
1973 } | |
1974 } | |
1975 | |
1976 void JavaThread::send_thread_stop(oop java_throwable) { | |
1977 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
1978 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
1979 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
1980 | |
1981 // Do not throw asynchronous exceptions against the compiler thread | |
1982 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
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1983 |
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1984 // (tw) May we do this? |
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1985 //if (is_Compiler_thread()) return; |
0 | 1986 |
1987 // This is a change from JDK 1.1, but JDK 1.2 will also do it: | |
1142 | 1988 if (java_throwable->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 1989 java_lang_Thread::set_stillborn(threadObj()); |
1990 } | |
1991 | |
1992 { | |
1993 // Actually throw the Throwable against the target Thread - however | |
1994 // only if there is no thread death exception installed already. | |
1142 | 1995 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 1996 // If the topmost frame is a runtime stub, then we are calling into |
1997 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
1998 // must deoptimize the caller before continuing, as the compiled exception handler table | |
1999 // may not be valid | |
2000 if (has_last_Java_frame()) { | |
2001 frame f = last_frame(); | |
2002 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
2003 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2004 RegisterMap reg_map(this, UseBiasedLocking); | |
2005 frame compiled_frame = f.sender(®_map); | |
2006 if (compiled_frame.can_be_deoptimized()) { | |
2007 Deoptimization::deoptimize(this, compiled_frame, ®_map); | |
2008 } | |
2009 } | |
2010 } | |
2011 | |
2012 // Set async. pending exception in thread. | |
2013 set_pending_async_exception(java_throwable); | |
2014 | |
2015 if (TraceExceptions) { | |
2016 ResourceMark rm; | |
2017 tty->print_cr("Pending Async. exception installed of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
2018 } | |
2019 // for AbortVMOnException flag | |
2020 NOT_PRODUCT(Exceptions::debug_check_abort(instanceKlass::cast(_pending_async_exception->klass())->external_name())); | |
2021 } | |
2022 } | |
2023 | |
2024 | |
2025 // Interrupt thread so it will wake up from a potential wait() | |
2026 Thread::interrupt(this); | |
2027 } | |
2028 | |
2029 // External suspension mechanism. | |
2030 // | |
2031 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
2032 // to any VM_locks and it is at a transition | |
2033 // Self-suspension will happen on the transition out of the vm. | |
2034 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
2035 // | |
2036 // Guarantees on return: | |
2037 // + Target thread will not execute any new bytecode (that's why we need to | |
2038 // force a safepoint) | |
2039 // + Target thread will not enter any new monitors | |
2040 // | |
2041 void JavaThread::java_suspend() { | |
2042 { MutexLocker mu(Threads_lock); | |
2043 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
2044 return; | |
2045 } | |
2046 } | |
2047 | |
2048 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2049 if (!is_external_suspend()) { | |
2050 // a racing resume has cancelled us; bail out now | |
2051 return; | |
2052 } | |
2053 | |
2054 // suspend is done | |
2055 uint32_t debug_bits = 0; | |
2056 // Warning: is_ext_suspend_completed() may temporarily drop the | |
2057 // SR_lock to allow the thread to reach a stable thread state if | |
2058 // it is currently in a transient thread state. | |
2059 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
2060 SuspendRetryDelay, &debug_bits) ) { | |
2061 return; | |
2062 } | |
2063 } | |
2064 | |
2065 VM_ForceSafepoint vm_suspend; | |
2066 VMThread::execute(&vm_suspend); | |
2067 } | |
2068 | |
2069 // Part II of external suspension. | |
2070 // A JavaThread self suspends when it detects a pending external suspend | |
2071 // request. This is usually on transitions. It is also done in places | |
2072 // where continuing to the next transition would surprise the caller, | |
2073 // e.g., monitor entry. | |
2074 // | |
2075 // Returns the number of times that the thread self-suspended. | |
2076 // | |
2077 // Note: DO NOT call java_suspend_self() when you just want to block current | |
2078 // thread. java_suspend_self() is the second stage of cooperative | |
2079 // suspension for external suspend requests and should only be used | |
2080 // to complete an external suspend request. | |
2081 // | |
2082 int JavaThread::java_suspend_self() { | |
2083 int ret = 0; | |
2084 | |
2085 // we are in the process of exiting so don't suspend | |
2086 if (is_exiting()) { | |
2087 clear_external_suspend(); | |
2088 return ret; | |
2089 } | |
2090 | |
2091 assert(_anchor.walkable() || | |
2092 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
2093 "must have walkable stack"); | |
2094 | |
2095 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2096 | |
979 | 2097 assert(!this->is_ext_suspended(), |
0 | 2098 "a thread trying to self-suspend should not already be suspended"); |
2099 | |
2100 if (this->is_suspend_equivalent()) { | |
2101 // If we are self-suspending as a result of the lifting of a | |
2102 // suspend equivalent condition, then the suspend_equivalent | |
2103 // flag is not cleared until we set the ext_suspended flag so | |
2104 // that wait_for_ext_suspend_completion() returns consistent | |
2105 // results. | |
2106 this->clear_suspend_equivalent(); | |
2107 } | |
2108 | |
2109 // A racing resume may have cancelled us before we grabbed SR_lock | |
2110 // above. Or another external suspend request could be waiting for us | |
2111 // by the time we return from SR_lock()->wait(). The thread | |
2112 // that requested the suspension may already be trying to walk our | |
2113 // stack and if we return now, we can change the stack out from under | |
2114 // it. This would be a "bad thing (TM)" and cause the stack walker | |
2115 // to crash. We stay self-suspended until there are no more pending | |
2116 // external suspend requests. | |
2117 while (is_external_suspend()) { | |
2118 ret++; | |
2119 this->set_ext_suspended(); | |
2120 | |
2121 // _ext_suspended flag is cleared by java_resume() | |
2122 while (is_ext_suspended()) { | |
2123 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
2124 } | |
2125 } | |
2126 | |
2127 return ret; | |
2128 } | |
2129 | |
2130 #ifdef ASSERT | |
2131 // verify the JavaThread has not yet been published in the Threads::list, and | |
2132 // hence doesn't need protection from concurrent access at this stage | |
2133 void JavaThread::verify_not_published() { | |
2134 if (!Threads_lock->owned_by_self()) { | |
2135 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
2136 assert( !Threads::includes(this), | |
2137 "java thread shouldn't have been published yet!"); | |
2138 } | |
2139 else { | |
2140 assert( !Threads::includes(this), | |
2141 "java thread shouldn't have been published yet!"); | |
2142 } | |
2143 } | |
2144 #endif | |
2145 | |
2146 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2147 // progress or when _suspend_flags is non-zero. | |
2148 // Current thread needs to self-suspend if there is a suspend request and/or | |
2149 // block if a safepoint is in progress. | |
2150 // Async exception ISN'T checked. | |
2151 // Note only the ThreadInVMfromNative transition can call this function | |
2152 // directly and when thread state is _thread_in_native_trans | |
2153 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
2154 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
2155 | |
2156 JavaThread *curJT = JavaThread::current(); | |
2157 bool do_self_suspend = thread->is_external_suspend(); | |
2158 | |
2159 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
2160 | |
2161 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2162 // thread is not the current thread. In older versions of jdbx, jdbx | |
2163 // threads could call into the VM with another thread's JNIEnv so we | |
2164 // can be here operating on behalf of a suspended thread (4432884). | |
2165 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
2166 JavaThreadState state = thread->thread_state(); | |
2167 | |
2168 // We mark this thread_blocked state as a suspend-equivalent so | |
2169 // that a caller to is_ext_suspend_completed() won't be confused. | |
2170 // The suspend-equivalent state is cleared by java_suspend_self(). | |
2171 thread->set_suspend_equivalent(); | |
2172 | |
2173 // If the safepoint code sees the _thread_in_native_trans state, it will | |
2174 // wait until the thread changes to other thread state. There is no | |
2175 // guarantee on how soon we can obtain the SR_lock and complete the | |
2176 // self-suspend request. It would be a bad idea to let safepoint wait for | |
2177 // too long. Temporarily change the state to _thread_blocked to | |
2178 // let the VM thread know that this thread is ready for GC. The problem | |
2179 // of changing thread state is that safepoint could happen just after | |
2180 // java_suspend_self() returns after being resumed, and VM thread will | |
2181 // see the _thread_blocked state. We must check for safepoint | |
2182 // after restoring the state and make sure we won't leave while a safepoint | |
2183 // is in progress. | |
2184 thread->set_thread_state(_thread_blocked); | |
2185 thread->java_suspend_self(); | |
2186 thread->set_thread_state(state); | |
2187 // Make sure new state is seen by VM thread | |
2188 if (os::is_MP()) { | |
2189 if (UseMembar) { | |
2190 // Force a fence between the write above and read below | |
2191 OrderAccess::fence(); | |
2192 } else { | |
2193 // Must use this rather than serialization page in particular on Windows | |
2194 InterfaceSupport::serialize_memory(thread); | |
2195 } | |
2196 } | |
2197 } | |
2198 | |
2199 if (SafepointSynchronize::do_call_back()) { | |
2200 // If we are safepointing, then block the caller which may not be | |
2201 // the same as the target thread (see above). | |
2202 SafepointSynchronize::block(curJT); | |
2203 } | |
2204 | |
2205 if (thread->is_deopt_suspend()) { | |
2206 thread->clear_deopt_suspend(); | |
2207 RegisterMap map(thread, false); | |
2208 frame f = thread->last_frame(); | |
2209 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
2210 f = f.sender(&map); | |
2211 } | |
2212 if (f.id() == thread->must_deopt_id()) { | |
2213 thread->clear_must_deopt_id(); | |
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2214 f.deoptimize(thread); |
0 | 2215 } else { |
2216 fatal("missed deoptimization!"); | |
2217 } | |
2218 } | |
2219 } | |
2220 | |
2221 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2222 // progress or when _suspend_flags is non-zero. | |
2223 // Current thread needs to self-suspend if there is a suspend request and/or | |
2224 // block if a safepoint is in progress. | |
2225 // Also check for pending async exception (not including unsafe access error). | |
2226 // Note only the native==>VM/Java barriers can call this function and when | |
2227 // thread state is _thread_in_native_trans. | |
2228 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
2229 check_safepoint_and_suspend_for_native_trans(thread); | |
2230 | |
2231 if (thread->has_async_exception()) { | |
2232 // We are in _thread_in_native_trans state, don't handle unsafe | |
2233 // access error since that may block. | |
2234 thread->check_and_handle_async_exceptions(false); | |
2235 } | |
2236 } | |
2237 | |
2238 // We need to guarantee the Threads_lock here, since resumes are not | |
2239 // allowed during safepoint synchronization | |
2240 // Can only resume from an external suspension | |
2241 void JavaThread::java_resume() { | |
2242 assert_locked_or_safepoint(Threads_lock); | |
2243 | |
2244 // Sanity check: thread is gone, has started exiting or the thread | |
2245 // was not externally suspended. | |
2246 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
2247 return; | |
2248 } | |
2249 | |
2250 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2251 | |
2252 clear_external_suspend(); | |
2253 | |
2254 if (is_ext_suspended()) { | |
2255 clear_ext_suspended(); | |
2256 SR_lock()->notify_all(); | |
2257 } | |
2258 } | |
2259 | |
2260 void JavaThread::create_stack_guard_pages() { | |
2261 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
2262 address low_addr = stack_base() - stack_size(); | |
2263 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2264 | |
2265 int allocate = os::allocate_stack_guard_pages(); | |
2266 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
2267 | |
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2268 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
0 | 2269 warning("Attempt to allocate stack guard pages failed."); |
2270 return; | |
2271 } | |
2272 | |
2273 if (os::guard_memory((char *) low_addr, len)) { | |
2274 _stack_guard_state = stack_guard_enabled; | |
2275 } else { | |
2276 warning("Attempt to protect stack guard pages failed."); | |
2277 if (os::uncommit_memory((char *) low_addr, len)) { | |
2278 warning("Attempt to deallocate stack guard pages failed."); | |
2279 } | |
2280 } | |
2281 } | |
2282 | |
2283 void JavaThread::remove_stack_guard_pages() { | |
2284 if (_stack_guard_state == stack_guard_unused) return; | |
2285 address low_addr = stack_base() - stack_size(); | |
2286 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2287 | |
2288 if (os::allocate_stack_guard_pages()) { | |
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2289 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
0 | 2290 _stack_guard_state = stack_guard_unused; |
2291 } else { | |
2292 warning("Attempt to deallocate stack guard pages failed."); | |
2293 } | |
2294 } else { | |
2295 if (_stack_guard_state == stack_guard_unused) return; | |
2296 if (os::unguard_memory((char *) low_addr, len)) { | |
2297 _stack_guard_state = stack_guard_unused; | |
2298 } else { | |
2299 warning("Attempt to unprotect stack guard pages failed."); | |
2300 } | |
2301 } | |
2302 } | |
2303 | |
2304 void JavaThread::enable_stack_yellow_zone() { | |
2305 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2306 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
2307 | |
2308 // The base notation is from the stacks point of view, growing downward. | |
2309 // We need to adjust it to work correctly with guard_memory() | |
2310 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2311 | |
2312 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
2313 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
2314 | |
2315 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
2316 _stack_guard_state = stack_guard_enabled; | |
2317 } else { | |
2318 warning("Attempt to guard stack yellow zone failed."); | |
2319 } | |
2320 enable_register_stack_guard(); | |
2321 } | |
2322 | |
2323 void JavaThread::disable_stack_yellow_zone() { | |
2324 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2325 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
2326 | |
2327 // Simply return if called for a thread that does not use guard pages. | |
2328 if (_stack_guard_state == stack_guard_unused) return; | |
2329 | |
2330 // The base notation is from the stacks point of view, growing downward. | |
2331 // We need to adjust it to work correctly with guard_memory() | |
2332 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2333 | |
2334 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
2335 _stack_guard_state = stack_guard_yellow_disabled; | |
2336 } else { | |
2337 warning("Attempt to unguard stack yellow zone failed."); | |
2338 } | |
2339 disable_register_stack_guard(); | |
2340 } | |
2341 | |
2342 void JavaThread::enable_stack_red_zone() { | |
2343 // The base notation is from the stacks point of view, growing downward. | |
2344 // We need to adjust it to work correctly with guard_memory() | |
2345 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2346 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2347 | |
2348 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
2349 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
2350 | |
2351 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
2352 warning("Attempt to guard stack red zone failed."); | |
2353 } | |
2354 } | |
2355 | |
2356 void JavaThread::disable_stack_red_zone() { | |
2357 // The base notation is from the stacks point of view, growing downward. | |
2358 // We need to adjust it to work correctly with guard_memory() | |
2359 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2360 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2361 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
2362 warning("Attempt to unguard stack red zone failed."); | |
2363 } | |
2364 } | |
2365 | |
2366 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
2367 // ignore is there is no stack | |
2368 if (!has_last_Java_frame()) return; | |
2369 // traverse the stack frames. Starts from top frame. | |
2370 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2371 frame* fr = fst.current(); | |
2372 f(fr, fst.register_map()); | |
2373 } | |
2374 } | |
2375 | |
2376 | |
2377 #ifndef PRODUCT | |
2378 // Deoptimization | |
2379 // Function for testing deoptimization | |
2380 void JavaThread::deoptimize() { | |
2381 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2382 StackFrameStream fst(this, UseBiasedLocking); | |
2383 bool deopt = false; // Dump stack only if a deopt actually happens. | |
2384 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
2385 // Iterate over all frames in the thread and deoptimize | |
2386 for(; !fst.is_done(); fst.next()) { | |
2387 if(fst.current()->can_be_deoptimized()) { | |
2388 | |
2389 if (only_at) { | |
2390 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
2391 // consists of comma or carriage return separated numbers so | |
2392 // search for the current bci in that string. | |
2393 address pc = fst.current()->pc(); | |
2394 nmethod* nm = (nmethod*) fst.current()->cb(); | |
2395 ScopeDesc* sd = nm->scope_desc_at( pc); | |
2396 char buffer[8]; | |
2397 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
2398 size_t len = strlen(buffer); | |
2399 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
2400 while (found != NULL) { | |
2401 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
2402 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
2403 // Check that the bci found is bracketed by terminators. | |
2404 break; | |
2405 } | |
2406 found = strstr(found + 1, buffer); | |
2407 } | |
2408 if (!found) { | |
2409 continue; | |
2410 } | |
2411 } | |
2412 | |
2413 if (DebugDeoptimization && !deopt) { | |
2414 deopt = true; // One-time only print before deopt | |
2415 tty->print_cr("[BEFORE Deoptimization]"); | |
2416 trace_frames(); | |
2417 trace_stack(); | |
2418 } | |
2419 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2420 } | |
2421 } | |
2422 | |
2423 if (DebugDeoptimization && deopt) { | |
2424 tty->print_cr("[AFTER Deoptimization]"); | |
2425 trace_frames(); | |
2426 } | |
2427 } | |
2428 | |
2429 | |
2430 // Make zombies | |
2431 void JavaThread::make_zombies() { | |
2432 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2433 if (fst.current()->can_be_deoptimized()) { | |
2434 // it is a Java nmethod | |
2435 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
2436 nm->make_not_entrant(); | |
2437 } | |
2438 } | |
2439 } | |
2440 #endif // PRODUCT | |
2441 | |
2442 | |
2443 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
2444 if (!has_last_Java_frame()) return; | |
2445 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2446 StackFrameStream fst(this, UseBiasedLocking); | |
2447 for(; !fst.is_done(); fst.next()) { | |
2448 if (fst.current()->should_be_deoptimized()) { | |
2449 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2450 } | |
2451 } | |
2452 } | |
2453 | |
2454 | |
2455 // GC support | |
2456 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
2457 | |
2458 void JavaThread::gc_epilogue() { | |
2459 frames_do(frame_gc_epilogue); | |
2460 } | |
2461 | |
2462 | |
2463 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
2464 | |
2465 void JavaThread::gc_prologue() { | |
2466 frames_do(frame_gc_prologue); | |
2467 } | |
2468 | |
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2469 // If the caller is a NamedThread, then remember, in the current scope, |
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2470 // the given JavaThread in its _processed_thread field. |
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2471 class RememberProcessedThread: public StackObj { |
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2472 NamedThread* _cur_thr; |
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2473 public: |
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2474 RememberProcessedThread(JavaThread* jthr) { |
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2475 Thread* thread = Thread::current(); |
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2476 if (thread->is_Named_thread()) { |
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2477 _cur_thr = (NamedThread *)thread; |
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2478 _cur_thr->set_processed_thread(jthr); |
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2479 } else { |
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2480 _cur_thr = NULL; |
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2481 } |
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2482 } |
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2483 |
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2484 ~RememberProcessedThread() { |
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2485 if (_cur_thr) { |
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2486 _cur_thr->set_processed_thread(NULL); |
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2487 } |
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2488 } |
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2489 }; |
0 | 2490 |
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2491 void JavaThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
1166 | 2492 // Verify that the deferred card marks have been flushed. |
2493 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
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2494 |
0 | 2495 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
2496 // since there may be more than one thread using each ThreadProfiler. | |
2497 | |
2498 // Traverse the GCHandles | |
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2499 Thread::oops_do(f, cf); |
0 | 2500 |
2501 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2502 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2503 | |
2504 if (has_last_Java_frame()) { | |
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2505 // Record JavaThread to GC thread |
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2506 RememberProcessedThread rpt(this); |
0 | 2507 |
2508 // Traverse the privileged stack | |
2509 if (_privileged_stack_top != NULL) { | |
2510 _privileged_stack_top->oops_do(f); | |
2511 } | |
2512 | |
2513 // traverse the registered growable array | |
2514 if (_array_for_gc != NULL) { | |
2515 for (int index = 0; index < _array_for_gc->length(); index++) { | |
2516 f->do_oop(_array_for_gc->adr_at(index)); | |
2517 } | |
2518 } | |
2519 | |
2520 // Traverse the monitor chunks | |
2521 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
2522 chunk->oops_do(f); | |
2523 } | |
2524 | |
2525 // Traverse the execution stack | |
2526 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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2527 fst.current()->oops_do(f, cf, fst.register_map()); |
0 | 2528 } |
2529 } | |
2530 | |
2531 // callee_target is never live across a gc point so NULL it here should | |
2532 // it still contain a methdOop. | |
2533 | |
2534 set_callee_target(NULL); | |
2535 | |
2536 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
2537 // If we have deferred set_locals there might be oops waiting to be | |
2538 // written | |
2539 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
2540 if (list != NULL) { | |
2541 for (int i = 0; i < list->length(); i++) { | |
2542 list->at(i)->oops_do(f); | |
2543 } | |
2544 } | |
2545 | |
2546 // Traverse instance variables at the end since the GC may be moving things | |
2547 // around using this function | |
2548 f->do_oop((oop*) &_threadObj); | |
2549 f->do_oop((oop*) &_vm_result); | |
2550 f->do_oop((oop*) &_vm_result_2); | |
2551 f->do_oop((oop*) &_exception_oop); | |
2552 f->do_oop((oop*) &_pending_async_exception); | |
2553 | |
2554 if (jvmti_thread_state() != NULL) { | |
2555 jvmti_thread_state()->oops_do(f); | |
2556 } | |
2557 } | |
2558 | |
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2559 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
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2560 Thread::nmethods_do(cf); // (super method is a no-op) |
0 | 2561 |
2562 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2563 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2564 | |
2565 if (has_last_Java_frame()) { | |
2566 // Traverse the execution stack | |
2567 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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2568 fst.current()->nmethods_do(cf); |
0 | 2569 } |
2570 } | |
2571 } | |
2572 | |
2573 // Printing | |
2574 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
2575 switch (_thread_state) { | |
2576 case _thread_uninitialized: return "_thread_uninitialized"; | |
2577 case _thread_new: return "_thread_new"; | |
2578 case _thread_new_trans: return "_thread_new_trans"; | |
2579 case _thread_in_native: return "_thread_in_native"; | |
2580 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
2581 case _thread_in_vm: return "_thread_in_vm"; | |
2582 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
2583 case _thread_in_Java: return "_thread_in_Java"; | |
2584 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
2585 case _thread_blocked: return "_thread_blocked"; | |
2586 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
2587 default: return "unknown thread state"; | |
2588 } | |
2589 } | |
2590 | |
2591 #ifndef PRODUCT | |
2592 void JavaThread::print_thread_state_on(outputStream *st) const { | |
2593 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
2594 }; | |
2595 void JavaThread::print_thread_state() const { | |
2596 print_thread_state_on(tty); | |
2597 }; | |
2598 #endif // PRODUCT | |
2599 | |
2600 // Called by Threads::print() for VM_PrintThreads operation | |
2601 void JavaThread::print_on(outputStream *st) const { | |
2602 st->print("\"%s\" ", get_thread_name()); | |
2603 oop thread_oop = threadObj(); | |
2604 if (thread_oop != NULL && java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
2605 Thread::print_on(st); | |
2606 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
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2607 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
0 | 2608 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
2609 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
2610 } | |
2611 #ifndef PRODUCT | |
2612 print_thread_state_on(st); | |
2613 _safepoint_state->print_on(st); | |
2614 #endif // PRODUCT | |
2615 } | |
2616 | |
2617 // Called by fatal error handler. The difference between this and | |
2618 // JavaThread::print() is that we can't grab lock or allocate memory. | |
2619 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
2620 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
2621 oop thread_obj = threadObj(); | |
2622 if (thread_obj != NULL) { | |
2623 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
2624 } | |
2625 st->print(" ["); | |
2626 st->print("%s", _get_thread_state_name(_thread_state)); | |
2627 if (osthread()) { | |
2628 st->print(", id=%d", osthread()->thread_id()); | |
2629 } | |
2630 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
2631 _stack_base - _stack_size, _stack_base); | |
2632 st->print("]"); | |
2633 return; | |
2634 } | |
2635 | |
2636 // Verification | |
2637 | |
2638 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
2639 | |
2640 void JavaThread::verify() { | |
2641 // Verify oops in the thread. | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
2642 oops_do(&VerifyOopClosure::verify_oop, NULL); |
0 | 2643 |
2644 // Verify the stack frames. | |
2645 frames_do(frame_verify); | |
2646 } | |
2647 | |
2648 // CR 6300358 (sub-CR 2137150) | |
2649 // Most callers of this method assume that it can't return NULL but a | |
2650 // thread may not have a name whilst it is in the process of attaching to | |
2651 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
2652 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
2653 // if vm exit occurs during initialization). These cases can all be accounted | |
2654 // for such that this method never returns NULL. | |
2655 const char* JavaThread::get_thread_name() const { | |
2656 #ifdef ASSERT | |
2657 // early safepoints can hit while current thread does not yet have TLS | |
2658 if (!SafepointSynchronize::is_at_safepoint()) { | |
2659 Thread *cur = Thread::current(); | |
2660 if (!(cur->is_Java_thread() && cur == this)) { | |
2661 // Current JavaThreads are allowed to get their own name without | |
2662 // the Threads_lock. | |
2663 assert_locked_or_safepoint(Threads_lock); | |
2664 } | |
2665 } | |
2666 #endif // ASSERT | |
2667 return get_thread_name_string(); | |
2668 } | |
2669 | |
2670 // Returns a non-NULL representation of this thread's name, or a suitable | |
2671 // descriptive string if there is no set name | |
2672 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
2673 const char* name_str; | |
2674 oop thread_obj = threadObj(); | |
2675 if (thread_obj != NULL) { | |
2676 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
2677 if (name != NULL) { | |
2678 if (buf == NULL) { | |
2679 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2680 } | |
2681 else { | |
2682 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
2683 } | |
2684 } | |
2685 else if (is_attaching()) { // workaround for 6412693 - see 6404306 | |
2686 name_str = "<no-name - thread is attaching>"; | |
2687 } | |
2688 else { | |
2689 name_str = Thread::name(); | |
2690 } | |
2691 } | |
2692 else { | |
2693 name_str = Thread::name(); | |
2694 } | |
2695 assert(name_str != NULL, "unexpected NULL thread name"); | |
2696 return name_str; | |
2697 } | |
2698 | |
2699 | |
2700 const char* JavaThread::get_threadgroup_name() const { | |
2701 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2702 oop thread_obj = threadObj(); | |
2703 if (thread_obj != NULL) { | |
2704 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2705 if (thread_group != NULL) { | |
2706 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
2707 // ThreadGroup.name can be null | |
2708 if (name != NULL) { | |
2709 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2710 return str; | |
2711 } | |
2712 } | |
2713 } | |
2714 return NULL; | |
2715 } | |
2716 | |
2717 const char* JavaThread::get_parent_name() const { | |
2718 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2719 oop thread_obj = threadObj(); | |
2720 if (thread_obj != NULL) { | |
2721 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2722 if (thread_group != NULL) { | |
2723 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
2724 if (parent != NULL) { | |
2725 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
2726 // ThreadGroup.name can be null | |
2727 if (name != NULL) { | |
2728 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2729 return str; | |
2730 } | |
2731 } | |
2732 } | |
2733 } | |
2734 return NULL; | |
2735 } | |
2736 | |
2737 ThreadPriority JavaThread::java_priority() const { | |
2738 oop thr_oop = threadObj(); | |
2739 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
2740 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
2741 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
2742 return priority; | |
2743 } | |
2744 | |
2745 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
2746 | |
2747 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
2748 // Link Java Thread object <-> C++ Thread | |
2749 | |
2750 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
2751 // and put it into a new Handle. The Handle "thread_oop" can then | |
2752 // be used to pass the C++ thread object to other methods. | |
2753 | |
2754 // Set the Java level thread object (jthread) field of the | |
2755 // new thread (a JavaThread *) to C++ thread object using the | |
2756 // "thread_oop" handle. | |
2757 | |
2758 // Set the thread field (a JavaThread *) of the | |
2759 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
2760 | |
2761 Handle thread_oop(Thread::current(), | |
2762 JNIHandles::resolve_non_null(jni_thread)); | |
2763 assert(instanceKlass::cast(thread_oop->klass())->is_linked(), | |
2764 "must be initialized"); | |
2765 set_threadObj(thread_oop()); | |
2766 java_lang_Thread::set_thread(thread_oop(), this); | |
2767 | |
2768 if (prio == NoPriority) { | |
2769 prio = java_lang_Thread::priority(thread_oop()); | |
2770 assert(prio != NoPriority, "A valid priority should be present"); | |
2771 } | |
2772 | |
2773 // Push the Java priority down to the native thread; needs Threads_lock | |
2774 Thread::set_priority(this, prio); | |
2775 | |
2776 // Add the new thread to the Threads list and set it in motion. | |
2777 // We must have threads lock in order to call Threads::add. | |
2778 // It is crucial that we do not block before the thread is | |
2779 // added to the Threads list for if a GC happens, then the java_thread oop | |
2780 // will not be visited by GC. | |
2781 Threads::add(this); | |
2782 } | |
2783 | |
2784 oop JavaThread::current_park_blocker() { | |
2785 // Support for JSR-166 locks | |
2786 oop thread_oop = threadObj(); | |
242 | 2787 if (thread_oop != NULL && |
2788 JDK_Version::current().supports_thread_park_blocker()) { | |
0 | 2789 return java_lang_Thread::park_blocker(thread_oop); |
2790 } | |
2791 return NULL; | |
2792 } | |
2793 | |
2794 | |
2795 void JavaThread::print_stack_on(outputStream* st) { | |
2796 if (!has_last_Java_frame()) return; | |
2797 ResourceMark rm; | |
2798 HandleMark hm; | |
2799 | |
2800 RegisterMap reg_map(this); | |
2801 vframe* start_vf = last_java_vframe(®_map); | |
2802 int count = 0; | |
2803 for (vframe* f = start_vf; f; f = f->sender() ) { | |
2804 if (f->is_java_frame()) { | |
2805 javaVFrame* jvf = javaVFrame::cast(f); | |
2806 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
2807 | |
2808 // Print out lock information | |
2809 if (JavaMonitorsInStackTrace) { | |
2810 jvf->print_lock_info_on(st, count); | |
2811 } | |
2812 } else { | |
2813 // Ignore non-Java frames | |
2814 } | |
2815 | |
2816 // Bail-out case for too deep stacks | |
2817 count++; | |
2818 if (MaxJavaStackTraceDepth == count) return; | |
2819 } | |
2820 } | |
2821 | |
2822 | |
2823 // JVMTI PopFrame support | |
2824 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
2825 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
2826 if (in_bytes(size_in_bytes) != 0) { | |
2827 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes)); | |
2828 _popframe_preserved_args_size = in_bytes(size_in_bytes); | |
1603
d93949c5bdcc
6730276: JDI_REGRESSION tests fail with "Error: count must be non-zero" error on x86
kvn
parents:
1584
diff
changeset
|
2829 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
0 | 2830 } |
2831 } | |
2832 | |
2833 void* JavaThread::popframe_preserved_args() { | |
2834 return _popframe_preserved_args; | |
2835 } | |
2836 | |
2837 ByteSize JavaThread::popframe_preserved_args_size() { | |
2838 return in_ByteSize(_popframe_preserved_args_size); | |
2839 } | |
2840 | |
2841 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
2842 int sz = in_bytes(popframe_preserved_args_size()); | |
2843 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
2844 return in_WordSize(sz / wordSize); | |
2845 } | |
2846 | |
2847 void JavaThread::popframe_free_preserved_args() { | |
2848 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
2849 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args); | |
2850 _popframe_preserved_args = NULL; | |
2851 _popframe_preserved_args_size = 0; | |
2852 } | |
2853 | |
2854 #ifndef PRODUCT | |
2855 | |
2856 void JavaThread::trace_frames() { | |
2857 tty->print_cr("[Describe stack]"); | |
2858 int frame_no = 1; | |
2859 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2860 tty->print(" %d. ", frame_no++); | |
2861 fst.current()->print_value_on(tty,this); | |
2862 tty->cr(); | |
2863 } | |
2864 } | |
2865 | |
2866 | |
2867 void JavaThread::trace_stack_from(vframe* start_vf) { | |
2868 ResourceMark rm; | |
2869 int vframe_no = 1; | |
2870 for (vframe* f = start_vf; f; f = f->sender() ) { | |
2871 if (f->is_java_frame()) { | |
2872 javaVFrame::cast(f)->print_activation(vframe_no++); | |
2873 } else { | |
2874 f->print(); | |
2875 } | |
2876 if (vframe_no > StackPrintLimit) { | |
2877 tty->print_cr("...<more frames>..."); | |
2878 return; | |
2879 } | |
2880 } | |
2881 } | |
2882 | |
2883 | |
2884 void JavaThread::trace_stack() { | |
2885 if (!has_last_Java_frame()) return; | |
2886 ResourceMark rm; | |
2887 HandleMark hm; | |
2888 RegisterMap reg_map(this); | |
2889 trace_stack_from(last_java_vframe(®_map)); | |
2890 } | |
2891 | |
2892 | |
2893 #endif // PRODUCT | |
2894 | |
2895 | |
2896 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
2897 assert(reg_map != NULL, "a map must be given"); | |
2898 frame f = last_frame(); | |
2899 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
2900 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
2901 } | |
2902 return NULL; | |
2903 } | |
2904 | |
2905 | |
2906 klassOop JavaThread::security_get_caller_class(int depth) { | |
2907 vframeStream vfst(this); | |
2908 vfst.security_get_caller_frame(depth); | |
2909 if (!vfst.at_end()) { | |
2910 return vfst.method()->method_holder(); | |
2911 } | |
2912 return NULL; | |
2913 } | |
2914 | |
2915 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
2916 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
2917 CompileBroker::compiler_thread_loop(); | |
2918 } | |
2919 | |
2920 // Create a CompilerThread | |
2921 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
2922 : JavaThread(&compiler_thread_entry) { | |
2923 _env = NULL; | |
2924 _log = NULL; | |
2925 _task = NULL; | |
2926 _queue = queue; | |
2927 _counters = counters; | |
1454
7cf1952ec5fb
Added flag -XX:BootstrapC1X that precompiles Object::<init> and then every method in the compilation queue until it is empty.
Thomas Wuerthinger <wuerthinger@ssw.jku.at>
parents:
1410
diff
changeset
|
2928 _is_compiling = false; |
1584 | 2929 _buffer_blob = NULL; |
0 | 2930 |
2931 #ifndef PRODUCT | |
2932 _ideal_graph_printer = NULL; | |
2933 #endif | |
2934 } | |
2935 | |
2936 | |
2937 // ======= Threads ======== | |
2938 | |
2939 // The Threads class links together all active threads, and provides | |
2940 // operations over all threads. It is protected by its own Mutex | |
2941 // lock, which is also used in other contexts to protect thread | |
2942 // operations from having the thread being operated on from exiting | |
2943 // and going away unexpectedly (e.g., safepoint synchronization) | |
2944 | |
2945 JavaThread* Threads::_thread_list = NULL; | |
2946 int Threads::_number_of_threads = 0; | |
2947 int Threads::_number_of_non_daemon_threads = 0; | |
2948 int Threads::_return_code = 0; | |
2949 size_t JavaThread::_stack_size_at_create = 0; | |
2950 | |
2951 // All JavaThreads | |
2952 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
2953 | |
2954 void os_stream(); | |
2955 | |
2956 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
2957 void Threads::threads_do(ThreadClosure* tc) { | |
2958 assert_locked_or_safepoint(Threads_lock); | |
2959 // ALL_JAVA_THREADS iterates through all JavaThreads | |
2960 ALL_JAVA_THREADS(p) { | |
2961 tc->do_thread(p); | |
2962 } | |
2963 // Someday we could have a table or list of all non-JavaThreads. | |
2964 // For now, just manually iterate through them. | |
2965 tc->do_thread(VMThread::vm_thread()); | |
2966 Universe::heap()->gc_threads_do(tc); | |
323
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
2967 WatcherThread *wt = WatcherThread::watcher_thread(); |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
2968 // Strictly speaking, the following NULL check isn't sufficient to make sure |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
2969 // the data for WatcherThread is still valid upon being examined. However, |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
2970 // considering that WatchThread terminates when the VM is on the way to |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
2971 // exit at safepoint, the chance of the above is extremely small. The right |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
2972 // way to prevent termination of WatcherThread would be to acquire |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
2973 // Terminator_lock, but we can't do that without violating the lock rank |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
2974 // checking in some cases. |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
2975 if (wt != NULL) |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
2976 tc->do_thread(wt); |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
2977 |
0 | 2978 // If CompilerThreads ever become non-JavaThreads, add them here |
2979 } | |
2980 | |
2981 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
2982 | |
242 | 2983 extern void JDK_Version_init(); |
2984 | |
0 | 2985 // Check version |
2986 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
2987 | |
2988 // Initialize the output stream module | |
2989 ostream_init(); | |
2990 | |
2991 // Process java launcher properties. | |
2992 Arguments::process_sun_java_launcher_properties(args); | |
2993 | |
2994 // Initialize the os module before using TLS | |
2995 os::init(); | |
2996 | |
2997 // Initialize system properties. | |
2998 Arguments::init_system_properties(); | |
2999 | |
242 | 3000 // So that JDK version can be used as a discrimintor when parsing arguments |
3001 JDK_Version_init(); | |
3002 | |
1864
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3003 // Update/Initialize System properties after JDK version number is known |
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3004 Arguments::init_version_specific_system_properties(); |
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3005 |
0 | 3006 // Parse arguments |
3007 jint parse_result = Arguments::parse(args); | |
3008 if (parse_result != JNI_OK) return parse_result; | |
3009 | |
3010 if (PauseAtStartup) { | |
3011 os::pause(); | |
3012 } | |
3013 | |
3014 HS_DTRACE_PROBE(hotspot, vm__init__begin); | |
3015 | |
3016 // Record VM creation timing statistics | |
3017 TraceVmCreationTime create_vm_timer; | |
3018 create_vm_timer.start(); | |
3019 | |
3020 // Timing (must come after argument parsing) | |
3021 TraceTime timer("Create VM", TraceStartupTime); | |
3022 | |
3023 // Initialize the os module after parsing the args | |
3024 jint os_init_2_result = os::init_2(); | |
3025 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
3026 | |
3027 // Initialize output stream logging | |
3028 ostream_init_log(); | |
3029 | |
3030 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
3031 // Must be before create_vm_init_agents() | |
3032 if (Arguments::init_libraries_at_startup()) { | |
3033 convert_vm_init_libraries_to_agents(); | |
3034 } | |
3035 | |
3036 // Launch -agentlib/-agentpath and converted -Xrun agents | |
3037 if (Arguments::init_agents_at_startup()) { | |
3038 create_vm_init_agents(); | |
3039 } | |
3040 | |
3041 // Initialize Threads state | |
3042 _thread_list = NULL; | |
3043 _number_of_threads = 0; | |
3044 _number_of_non_daemon_threads = 0; | |
3045 | |
3046 // Initialize TLS | |
3047 ThreadLocalStorage::init(); | |
3048 | |
3049 // Initialize global data structures and create system classes in heap | |
3050 vm_init_globals(); | |
3051 | |
3052 // Attach the main thread to this os thread | |
3053 JavaThread* main_thread = new JavaThread(); | |
3054 main_thread->set_thread_state(_thread_in_vm); | |
3055 // must do this before set_active_handles and initialize_thread_local_storage | |
3056 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
3057 // change the stack size recorded here to one based on the java thread | |
3058 // stacksize. This adjusted size is what is used to figure the placement | |
3059 // of the guard pages. | |
3060 main_thread->record_stack_base_and_size(); | |
3061 main_thread->initialize_thread_local_storage(); | |
3062 | |
3063 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
3064 | |
3065 if (!main_thread->set_as_starting_thread()) { | |
3066 vm_shutdown_during_initialization( | |
3067 "Failed necessary internal allocation. Out of swap space"); | |
3068 delete main_thread; | |
3069 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3070 return JNI_ENOMEM; | |
3071 } | |
3072 | |
3073 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
3074 // crash Linux VM, see notes in os_linux.cpp. | |
3075 main_thread->create_stack_guard_pages(); | |
3076 | |
1878 | 3077 // Initialize Java-Level synchronization subsystem |
3078 ObjectMonitor::Initialize() ; | |
0 | 3079 |
3080 // Initialize global modules | |
3081 jint status = init_globals(); | |
3082 if (status != JNI_OK) { | |
3083 delete main_thread; | |
3084 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3085 return status; | |
3086 } | |
3087 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3088 // Should be done after the heap is fully created |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3089 main_thread->cache_global_variables(); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3090 |
0 | 3091 HandleMark hm; |
3092 | |
3093 { MutexLocker mu(Threads_lock); | |
3094 Threads::add(main_thread); | |
3095 } | |
3096 | |
3097 // Any JVMTI raw monitors entered in onload will transition into | |
3098 // real raw monitor. VM is setup enough here for raw monitor enter. | |
3099 JvmtiExport::transition_pending_onload_raw_monitors(); | |
3100 | |
3101 if (VerifyBeforeGC && | |
3102 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
3103 Universe::heap()->prepare_for_verify(); | |
3104 Universe::verify(); // make sure we're starting with a clean slate | |
3105 } | |
3106 | |
3107 // Create the VMThread | |
3108 { TraceTime timer("Start VMThread", TraceStartupTime); | |
3109 VMThread::create(); | |
3110 Thread* vmthread = VMThread::vm_thread(); | |
3111 | |
3112 if (!os::create_thread(vmthread, os::vm_thread)) | |
3113 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
3114 | |
3115 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
3116 // Monitors can have spurious returns, must always check another state flag | |
3117 { | |
3118 MutexLocker ml(Notify_lock); | |
3119 os::start_thread(vmthread); | |
3120 while (vmthread->active_handles() == NULL) { | |
3121 Notify_lock->wait(); | |
3122 } | |
3123 } | |
3124 } | |
3125 | |
3126 assert (Universe::is_fully_initialized(), "not initialized"); | |
3127 EXCEPTION_MARK; | |
3128 | |
3129 // At this point, the Universe is initialized, but we have not executed | |
3130 // any byte code. Now is a good time (the only time) to dump out the | |
3131 // internal state of the JVM for sharing. | |
3132 | |
3133 if (DumpSharedSpaces) { | |
3134 Universe::heap()->preload_and_dump(CHECK_0); | |
3135 ShouldNotReachHere(); | |
3136 } | |
3137 | |
3138 // Always call even when there are not JVMTI environments yet, since environments | |
3139 // may be attached late and JVMTI must track phases of VM execution | |
3140 JvmtiExport::enter_start_phase(); | |
3141 | |
3142 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
3143 JvmtiExport::post_vm_start(); | |
3144 | |
3145 { | |
3146 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
3147 | |
3148 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3149 create_vm_init_libraries(); | |
3150 } | |
3151 | |
3152 if (InitializeJavaLangString) { | |
3153 initialize_class(vmSymbolHandles::java_lang_String(), CHECK_0); | |
3154 } else { | |
3155 warning("java.lang.String not initialized"); | |
3156 } | |
3157 | |
18
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|
3158 if (AggressiveOpts) { |
192
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|
3159 { |
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|
3160 // Forcibly initialize java/util/HashMap and mutate the private |
6d13fcb3663f
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|
3161 // static final "frontCacheEnabled" field before we start creating instances |
18
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|
3162 #ifdef ASSERT |
192
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3163 klassOop tmp_k = SystemDictionary::find(vmSymbolHandles::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
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3164 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
18
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3165 #endif |
192
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3166 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbolHandles::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
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3167 KlassHandle k = KlassHandle(THREAD, k_o); |
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3168 guarantee(k.not_null(), "Must find java/util/HashMap"); |
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3169 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
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3170 ik->initialize(CHECK_0); |
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|
3171 fieldDescriptor fd; |
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|
3172 // Possible we might not find this field; if so, don't break |
6d13fcb3663f
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|
3173 if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
6d13fcb3663f
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3174 k()->bool_field_put(fd.offset(), true); |
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|
3175 } |
6d13fcb3663f
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kvn
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62
diff
changeset
|
3176 } |
6d13fcb3663f
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kvn
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diff
changeset
|
3177 |
6d13fcb3663f
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changeset
|
3178 if (UseStringCache) { |
669
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6810653: Change String cache class used by Hotspot from String to StringValue
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|
3179 // Forcibly initialize java/lang/StringValue and mutate the private |
192
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|
3180 // static final "stringCacheEnabled" field before we start creating instances |
669
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|
3181 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbolHandles::java_lang_StringValue(), Handle(), Handle(), CHECK_0); |
eca19a8425b5
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|
3182 // Possible that StringValue isn't present: if so, silently don't break |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
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441
diff
changeset
|
3183 if (k_o != NULL) { |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
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diff
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|
3184 KlassHandle k = KlassHandle(THREAD, k_o); |
eca19a8425b5
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|
3185 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
eca19a8425b5
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diff
changeset
|
3186 ik->initialize(CHECK_0); |
eca19a8425b5
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diff
changeset
|
3187 fieldDescriptor fd; |
eca19a8425b5
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diff
changeset
|
3188 // Possible we might not find this field: if so, silently don't break |
eca19a8425b5
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phh
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441
diff
changeset
|
3189 if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
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6810653: Change String cache class used by Hotspot from String to StringValue
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|
3190 k()->bool_field_put(fd.offset(), true); |
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|
3191 } |
192
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|
3192 } |
18
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
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diff
changeset
|
3193 } |
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phh
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0
diff
changeset
|
3194 } |
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diff
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|
3195 |
0 | 3196 // Initialize java_lang.System (needed before creating the thread) |
3197 if (InitializeJavaLangSystem) { | |
3198 initialize_class(vmSymbolHandles::java_lang_System(), CHECK_0); | |
3199 initialize_class(vmSymbolHandles::java_lang_ThreadGroup(), CHECK_0); | |
3200 Handle thread_group = create_initial_thread_group(CHECK_0); | |
3201 Universe::set_main_thread_group(thread_group()); | |
3202 initialize_class(vmSymbolHandles::java_lang_Thread(), CHECK_0); | |
3203 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); | |
3204 main_thread->set_threadObj(thread_object); | |
3205 // Set thread status to running since main thread has | |
3206 // been started and running. | |
3207 java_lang_Thread::set_thread_status(thread_object, | |
3208 java_lang_Thread::RUNNABLE); | |
3209 | |
3210 // The VM preresolve methods to these classes. Make sure that get initialized | |
3211 initialize_class(vmSymbolHandles::java_lang_reflect_Method(), CHECK_0); | |
3212 initialize_class(vmSymbolHandles::java_lang_ref_Finalizer(), CHECK_0); | |
3213 // The VM creates & returns objects of this class. Make sure it's initialized. | |
3214 initialize_class(vmSymbolHandles::java_lang_Class(), CHECK_0); | |
3215 call_initializeSystemClass(CHECK_0); | |
3216 } else { | |
3217 warning("java.lang.System not initialized"); | |
3218 } | |
3219 | |
3220 // an instance of OutOfMemory exception has been allocated earlier | |
3221 if (InitializeJavaLangExceptionsErrors) { | |
3222 initialize_class(vmSymbolHandles::java_lang_OutOfMemoryError(), CHECK_0); | |
3223 initialize_class(vmSymbolHandles::java_lang_NullPointerException(), CHECK_0); | |
3224 initialize_class(vmSymbolHandles::java_lang_ClassCastException(), CHECK_0); | |
3225 initialize_class(vmSymbolHandles::java_lang_ArrayStoreException(), CHECK_0); | |
3226 initialize_class(vmSymbolHandles::java_lang_ArithmeticException(), CHECK_0); | |
3227 initialize_class(vmSymbolHandles::java_lang_StackOverflowError(), CHECK_0); | |
3228 initialize_class(vmSymbolHandles::java_lang_IllegalMonitorStateException(), CHECK_0); | |
3229 } else { | |
3230 warning("java.lang.OutOfMemoryError has not been initialized"); | |
3231 warning("java.lang.NullPointerException has not been initialized"); | |
3232 warning("java.lang.ClassCastException has not been initialized"); | |
3233 warning("java.lang.ArrayStoreException has not been initialized"); | |
3234 warning("java.lang.ArithmeticException has not been initialized"); | |
3235 warning("java.lang.StackOverflowError has not been initialized"); | |
3236 } | |
3237 } | |
3238 | |
3239 // See : bugid 4211085. | |
3240 // Background : the static initializer of java.lang.Compiler tries to read | |
3241 // property"java.compiler" and read & write property "java.vm.info". | |
3242 // When a security manager is installed through the command line | |
3243 // option "-Djava.security.manager", the above properties are not | |
3244 // readable and the static initializer for java.lang.Compiler fails | |
3245 // resulting in a NoClassDefFoundError. This can happen in any | |
3246 // user code which calls methods in java.lang.Compiler. | |
3247 // Hack : the hack is to pre-load and initialize this class, so that only | |
3248 // system domains are on the stack when the properties are read. | |
3249 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
3250 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
3251 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
3252 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
3253 // Once that is done, we should remove this hack. | |
3254 initialize_class(vmSymbolHandles::java_lang_Compiler(), CHECK_0); | |
3255 | |
3256 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
3257 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
3258 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
3259 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
3260 // This should also be taken out as soon as 4211383 gets fixed. | |
3261 reset_vm_info_property(CHECK_0); | |
3262 | |
3263 quicken_jni_functions(); | |
3264 | |
3265 // Set flag that basic initialization has completed. Used by exceptions and various | |
3266 // debug stuff, that does not work until all basic classes have been initialized. | |
3267 set_init_completed(); | |
3268 | |
3269 HS_DTRACE_PROBE(hotspot, vm__init__end); | |
3270 | |
3271 // record VM initialization completion time | |
3272 Management::record_vm_init_completed(); | |
3273 | |
3274 // Compute system loader. Note that this has to occur after set_init_completed, since | |
3275 // valid exceptions may be thrown in the process. | |
3276 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
3277 // set_init_completed has just been called, causing exceptions not to be shortcut | |
3278 // anymore. We call vm_exit_during_initialization directly instead. | |
3279 SystemDictionary::compute_java_system_loader(THREAD); | |
3280 if (HAS_PENDING_EXCEPTION) { | |
3281 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3282 } | |
3283 | |
1115
4b966d9946a3
6888880: JKernel VM to inject the sun.jkernel.DownloadManager as a boot classloader hook
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|
3284 #ifdef KERNEL |
4b966d9946a3
6888880: JKernel VM to inject the sun.jkernel.DownloadManager as a boot classloader hook
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diff
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|
3285 if (JDK_Version::is_gte_jdk17x_version()) { |
4b966d9946a3
6888880: JKernel VM to inject the sun.jkernel.DownloadManager as a boot classloader hook
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diff
changeset
|
3286 set_jkernel_boot_classloader_hook(THREAD); |
4b966d9946a3
6888880: JKernel VM to inject the sun.jkernel.DownloadManager as a boot classloader hook
mchung
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1027
diff
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|
3287 } |
4b966d9946a3
6888880: JKernel VM to inject the sun.jkernel.DownloadManager as a boot classloader hook
mchung
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diff
changeset
|
3288 #endif // KERNEL |
4b966d9946a3
6888880: JKernel VM to inject the sun.jkernel.DownloadManager as a boot classloader hook
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|
3289 |
0 | 3290 #ifndef SERIALGC |
3291 // Support for ConcurrentMarkSweep. This should be cleaned up | |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
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diff
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|
3292 // and better encapsulated. The ugly nested if test would go away |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
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62
diff
changeset
|
3293 // once things are properly refactored. XXX YSR |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
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62
diff
changeset
|
3294 if (UseConcMarkSweepGC || UseG1GC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
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62
diff
changeset
|
3295 if (UseConcMarkSweepGC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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diff
changeset
|
3296 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
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diff
changeset
|
3297 } else { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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diff
changeset
|
3298 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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|
3299 } |
0 | 3300 if (HAS_PENDING_EXCEPTION) { |
3301 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3302 } | |
3303 } | |
3304 #endif // SERIALGC | |
3305 | |
3306 // Always call even when there are not JVMTI environments yet, since environments | |
3307 // may be attached late and JVMTI must track phases of VM execution | |
3308 JvmtiExport::enter_live_phase(); | |
3309 | |
3310 // Signal Dispatcher needs to be started before VMInit event is posted | |
3311 os::signal_init(); | |
3312 | |
3313 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
3314 if (!DisableAttachMechanism) { | |
3315 if (StartAttachListener || AttachListener::init_at_startup()) { | |
3316 AttachListener::init(); | |
3317 } | |
3318 } | |
3319 | |
3320 // Launch -Xrun agents | |
3321 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
3322 // back-end can launch with -Xdebug -Xrunjdwp. | |
3323 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3324 create_vm_init_libraries(); | |
3325 } | |
3326 | |
3327 // Notify JVMTI agents that VM initialization is complete - nop if no agents. | |
3328 JvmtiExport::post_vm_initialized(); | |
3329 | |
3330 Chunk::start_chunk_pool_cleaner_task(); | |
3331 | |
3332 // initialize compiler(s) | |
3333 CompileBroker::compilation_init(); | |
3334 | |
3335 Management::initialize(THREAD); | |
3336 if (HAS_PENDING_EXCEPTION) { | |
3337 // management agent fails to start possibly due to | |
3338 // configuration problem and is responsible for printing | |
3339 // stack trace if appropriate. Simply exit VM. | |
3340 vm_exit(1); | |
3341 } | |
3342 | |
3343 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
3344 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
3345 if (MemProfiling) MemProfiler::engage(); | |
3346 StatSampler::engage(); | |
3347 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
3348 | |
3349 BiasedLocking::init(); | |
3350 | |
3351 | |
3352 // Start up the WatcherThread if there are any periodic tasks | |
3353 // NOTE: All PeriodicTasks should be registered by now. If they | |
3354 // aren't, late joiners might appear to start slowly (we might | |
3355 // take a while to process their first tick). | |
3356 if (PeriodicTask::num_tasks() > 0) { | |
3357 WatcherThread::start(); | |
3358 } | |
3359 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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1608
diff
changeset
|
3360 // Give os specific code one last chance to start |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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1608
diff
changeset
|
3361 os::init_3(); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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1608
diff
changeset
|
3362 |
0 | 3363 create_vm_timer.end(); |
3364 return JNI_OK; | |
3365 } | |
3366 | |
3367 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
3368 extern "C" { | |
3369 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
3370 } | |
3371 // Find a command line agent library and return its entry point for | |
3372 // -agentlib: -agentpath: -Xrun | |
3373 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
3374 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
3375 OnLoadEntry_t on_load_entry = NULL; | |
3376 void *library = agent->os_lib(); // check if we have looked it up before | |
3377 | |
3378 if (library == NULL) { | |
3379 char buffer[JVM_MAXPATHLEN]; | |
3380 char ebuf[1024]; | |
3381 const char *name = agent->name(); | |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
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diff
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|
3382 const char *msg = "Could not find agent library "; |
0 | 3383 |
3384 if (agent->is_absolute_path()) { | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
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1972
diff
changeset
|
3385 library = os::dll_load(name, ebuf, sizeof ebuf); |
0 | 3386 if (library == NULL) { |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
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1681
diff
changeset
|
3387 const char *sub_msg = " in absolute path, with error: "; |
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
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1681
diff
changeset
|
3388 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
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1681
diff
changeset
|
3389 char *buf = NEW_C_HEAP_ARRAY(char, len); |
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3390 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3391 // If we can't find the agent, exit. |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3392 vm_exit_during_initialization(buf, NULL); |
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
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1681
diff
changeset
|
3393 FREE_C_HEAP_ARRAY(char, buf); |
0 | 3394 } |
3395 } else { | |
3396 // Try to load the agent from the standard dll directory | |
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3397 os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), name); |
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3398 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3399 #ifdef KERNEL |
3400 // Download instrument dll | |
3401 if (library == NULL && strcmp(name, "instrument") == 0) { | |
3402 char *props = Arguments::get_kernel_properties(); | |
3403 char *home = Arguments::get_java_home(); | |
3404 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
3405 " sun.jkernel.DownloadManager -download client_jvm"; | |
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3406 size_t length = strlen(props) + strlen(home) + strlen(fmt) + 1; |
ab3fd720516c
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3407 char *cmd = NEW_C_HEAP_ARRAY(char, length); |
0 | 3408 jio_snprintf(cmd, length, fmt, home, props); |
3409 int status = os::fork_and_exec(cmd); | |
3410 FreeHeap(props); | |
3411 if (status == -1) { | |
3412 warning(cmd); | |
3413 vm_exit_during_initialization("fork_and_exec failed: %s", | |
3414 strerror(errno)); | |
3415 } | |
1694
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3416 FREE_C_HEAP_ARRAY(char, cmd); |
0 | 3417 // when this comes back the instrument.dll should be where it belongs. |
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3418 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3419 } |
3420 #endif // KERNEL | |
3421 if (library == NULL) { // Try the local directory | |
3422 char ns[1] = {0}; | |
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3423 os::dll_build_name(buffer, sizeof(buffer), ns, name); |
828eafbd85cc
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|
3424 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3425 if (library == NULL) { |
1694
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|
3426 const char *sub_msg = " on the library path, with error: "; |
ab3fd720516c
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|
3427 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
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3428 char *buf = NEW_C_HEAP_ARRAY(char, len); |
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|
3429 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3430 // If we can't find the agent, exit. |
1694
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|
3431 vm_exit_during_initialization(buf, NULL); |
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|
3432 FREE_C_HEAP_ARRAY(char, buf); |
0 | 3433 } |
3434 } | |
3435 } | |
3436 agent->set_os_lib(library); | |
3437 } | |
3438 | |
3439 // Find the OnLoad function. | |
3440 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
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3441 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, os::dll_lookup(library, on_load_symbols[symbol_index])); |
0 | 3442 if (on_load_entry != NULL) break; |
3443 } | |
3444 return on_load_entry; | |
3445 } | |
3446 | |
3447 // Find the JVM_OnLoad entry point | |
3448 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
3449 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
3450 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3451 } | |
3452 | |
3453 // Find the Agent_OnLoad entry point | |
3454 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
3455 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
3456 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3457 } | |
3458 | |
3459 // For backwards compatibility with -Xrun | |
3460 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
3461 // treated like -agentpath: | |
3462 // Must be called before agent libraries are created | |
3463 void Threads::convert_vm_init_libraries_to_agents() { | |
3464 AgentLibrary* agent; | |
3465 AgentLibrary* next; | |
3466 | |
3467 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
3468 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
3469 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3470 | |
3471 // If there is an JVM_OnLoad function it will get called later, | |
3472 // otherwise see if there is an Agent_OnLoad | |
3473 if (on_load_entry == NULL) { | |
3474 on_load_entry = lookup_agent_on_load(agent); | |
3475 if (on_load_entry != NULL) { | |
3476 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
3477 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
3478 Arguments::convert_library_to_agent(agent); | |
3479 } else { | |
3480 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
3481 } | |
3482 } | |
3483 } | |
3484 } | |
3485 | |
3486 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
3487 // Invokes Agent_OnLoad | |
3488 // Called very early -- before JavaThreads exist | |
3489 void Threads::create_vm_init_agents() { | |
3490 extern struct JavaVM_ main_vm; | |
3491 AgentLibrary* agent; | |
3492 | |
3493 JvmtiExport::enter_onload_phase(); | |
3494 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3495 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
3496 | |
3497 if (on_load_entry != NULL) { | |
3498 // Invoke the Agent_OnLoad function | |
3499 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3500 if (err != JNI_OK) { | |
3501 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
3502 } | |
3503 } else { | |
3504 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
3505 } | |
3506 } | |
3507 JvmtiExport::enter_primordial_phase(); | |
3508 } | |
3509 | |
3510 extern "C" { | |
3511 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
3512 } | |
3513 | |
3514 void Threads::shutdown_vm_agents() { | |
3515 // Send any Agent_OnUnload notifications | |
3516 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
3517 extern struct JavaVM_ main_vm; | |
3518 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3519 | |
3520 // Find the Agent_OnUnload function. | |
3521 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
3522 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
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diff
changeset
|
3523 os::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
0 | 3524 |
3525 // Invoke the Agent_OnUnload function | |
3526 if (unload_entry != NULL) { | |
3527 JavaThread* thread = JavaThread::current(); | |
3528 ThreadToNativeFromVM ttn(thread); | |
3529 HandleMark hm(thread); | |
3530 (*unload_entry)(&main_vm); | |
3531 break; | |
3532 } | |
3533 } | |
3534 } | |
3535 } | |
3536 | |
3537 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
3538 // Invokes JVM_OnLoad | |
3539 void Threads::create_vm_init_libraries() { | |
3540 extern struct JavaVM_ main_vm; | |
3541 AgentLibrary* agent; | |
3542 | |
3543 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
3544 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3545 | |
3546 if (on_load_entry != NULL) { | |
3547 // Invoke the JVM_OnLoad function | |
3548 JavaThread* thread = JavaThread::current(); | |
3549 ThreadToNativeFromVM ttn(thread); | |
3550 HandleMark hm(thread); | |
3551 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3552 if (err != JNI_OK) { | |
3553 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
3554 } | |
3555 } else { | |
3556 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
3557 } | |
3558 } | |
3559 } | |
3560 | |
3561 // Last thread running calls java.lang.Shutdown.shutdown() | |
3562 void JavaThread::invoke_shutdown_hooks() { | |
3563 HandleMark hm(this); | |
3564 | |
3565 // We could get here with a pending exception, if so clear it now. | |
3566 if (this->has_pending_exception()) { | |
3567 this->clear_pending_exception(); | |
3568 } | |
3569 | |
3570 EXCEPTION_MARK; | |
3571 klassOop k = | |
3572 SystemDictionary::resolve_or_null(vmSymbolHandles::java_lang_Shutdown(), | |
3573 THREAD); | |
3574 if (k != NULL) { | |
3575 // SystemDictionary::resolve_or_null will return null if there was | |
3576 // an exception. If we cannot load the Shutdown class, just don't | |
3577 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
3578 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
3579 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
3580 // was called, the Shutdown class would have already been loaded | |
3581 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
3582 instanceKlassHandle shutdown_klass (THREAD, k); | |
3583 JavaValue result(T_VOID); | |
3584 JavaCalls::call_static(&result, | |
3585 shutdown_klass, | |
3586 vmSymbolHandles::shutdown_method_name(), | |
3587 vmSymbolHandles::void_method_signature(), | |
3588 THREAD); | |
3589 } | |
3590 CLEAR_PENDING_EXCEPTION; | |
3591 } | |
3592 | |
3593 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
3594 // the program falls off the end of main(). Another VM exit path is through | |
3595 // vm_exit() when the program calls System.exit() to return a value or when | |
3596 // there is a serious error in VM. The two shutdown paths are not exactly | |
3597 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
3598 // and VM_Exit op at VM level. | |
3599 // | |
3600 // Shutdown sequence: | |
3601 // + Wait until we are the last non-daemon thread to execute | |
3602 // <-- every thing is still working at this moment --> | |
3603 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
3604 // shutdown hooks, run finalizers if finalization-on-exit | |
3605 // + Call before_exit(), prepare for VM exit | |
3606 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
3607 // currently the only user of this mechanism is File.deleteOnExit()) | |
3608 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
3609 // post thread end and vm death events to JVMTI, | |
3610 // stop signal thread | |
3611 // + Call JavaThread::exit(), it will: | |
3612 // > release JNI handle blocks, remove stack guard pages | |
3613 // > remove this thread from Threads list | |
3614 // <-- no more Java code from this thread after this point --> | |
3615 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
3616 // the compiler threads at safepoint | |
3617 // <-- do not use anything that could get blocked by Safepoint --> | |
3618 // + Disable tracing at JNI/JVM barriers | |
3619 // + Set _vm_exited flag for threads that are still running native code | |
3620 // + Delete this thread | |
3621 // + Call exit_globals() | |
3622 // > deletes tty | |
3623 // > deletes PerfMemory resources | |
3624 // + Return to caller | |
3625 | |
3626 bool Threads::destroy_vm() { | |
3627 JavaThread* thread = JavaThread::current(); | |
3628 | |
3629 // Wait until we are the last non-daemon thread to execute | |
3630 { MutexLocker nu(Threads_lock); | |
3631 while (Threads::number_of_non_daemon_threads() > 1 ) | |
3632 // This wait should make safepoint checks, wait without a timeout, | |
3633 // and wait as a suspend-equivalent condition. | |
3634 // | |
3635 // Note: If the FlatProfiler is running and this thread is waiting | |
3636 // for another non-daemon thread to finish, then the FlatProfiler | |
3637 // is waiting for the external suspend request on this thread to | |
3638 // complete. wait_for_ext_suspend_completion() will eventually | |
3639 // timeout, but that takes time. Making this wait a suspend- | |
3640 // equivalent condition solves that timeout problem. | |
3641 // | |
3642 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
3643 Mutex::_as_suspend_equivalent_flag); | |
3644 } | |
3645 | |
3646 // Hang forever on exit if we are reporting an error. | |
3647 if (ShowMessageBoxOnError && is_error_reported()) { | |
3648 os::infinite_sleep(); | |
3649 } | |
3650 | |
3651 if (JDK_Version::is_jdk12x_version()) { | |
3652 // We are the last thread running, so check if finalizers should be run. | |
3653 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
3654 HandleMark rm(thread); | |
3655 Universe::run_finalizers_on_exit(); | |
3656 } else { | |
3657 // run Java level shutdown hooks | |
3658 thread->invoke_shutdown_hooks(); | |
3659 } | |
3660 | |
3661 before_exit(thread); | |
3662 | |
3663 thread->exit(true); | |
3664 | |
3665 // Stop VM thread. | |
3666 { | |
3667 // 4945125 The vm thread comes to a safepoint during exit. | |
3668 // GC vm_operations can get caught at the safepoint, and the | |
3669 // heap is unparseable if they are caught. Grab the Heap_lock | |
3670 // to prevent this. The GC vm_operations will not be able to | |
3671 // queue until after the vm thread is dead. | |
3672 MutexLocker ml(Heap_lock); | |
3673 | |
3674 VMThread::wait_for_vm_thread_exit(); | |
3675 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
3676 VMThread::destroy(); | |
3677 } | |
3678 | |
3679 // clean up ideal graph printers | |
3680 #if defined(COMPILER2) && !defined(PRODUCT) | |
3681 IdealGraphPrinter::clean_up(); | |
3682 #endif | |
3683 | |
3684 // Now, all Java threads are gone except daemon threads. Daemon threads | |
3685 // running Java code or in VM are stopped by the Safepoint. However, | |
3686 // daemon threads executing native code are still running. But they | |
3687 // will be stopped at native=>Java/VM barriers. Note that we can't | |
3688 // simply kill or suspend them, as it is inherently deadlock-prone. | |
3689 | |
3690 #ifndef PRODUCT | |
3691 // disable function tracing at JNI/JVM barriers | |
3692 TraceJNICalls = false; | |
3693 TraceJVMCalls = false; | |
3694 TraceRuntimeCalls = false; | |
3695 #endif | |
3696 | |
3697 VM_Exit::set_vm_exited(); | |
3698 | |
3699 notify_vm_shutdown(); | |
3700 | |
3701 delete thread; | |
3702 | |
3703 // exit_globals() will delete tty | |
3704 exit_globals(); | |
3705 | |
3706 return true; | |
3707 } | |
3708 | |
3709 | |
3710 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
3711 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
3712 return is_supported_jni_version(version); | |
3713 } | |
3714 | |
3715 | |
3716 jboolean Threads::is_supported_jni_version(jint version) { | |
3717 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
3718 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
3719 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
3720 return JNI_FALSE; | |
3721 } | |
3722 | |
3723 | |
3724 void Threads::add(JavaThread* p, bool force_daemon) { | |
3725 // The threads lock must be owned at this point | |
3726 assert_locked_or_safepoint(Threads_lock); | |
1842
6e0aac35bfa9
6980838: G1: guarantee(false) failed: thread has an unexpected active value in its SATB queue
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1838
diff
changeset
|
3727 |
6e0aac35bfa9
6980838: G1: guarantee(false) failed: thread has an unexpected active value in its SATB queue
tonyp
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1838
diff
changeset
|
3728 // See the comment for this method in thread.hpp for its purpose and |
6e0aac35bfa9
6980838: G1: guarantee(false) failed: thread has an unexpected active value in its SATB queue
tonyp
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1838
diff
changeset
|
3729 // why it is called here. |
6e0aac35bfa9
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diff
changeset
|
3730 p->initialize_queues(); |
0 | 3731 p->set_next(_thread_list); |
3732 _thread_list = p; | |
3733 _number_of_threads++; | |
3734 oop threadObj = p->threadObj(); | |
3735 bool daemon = true; | |
3736 // Bootstrapping problem: threadObj can be null for initial | |
3737 // JavaThread (or for threads attached via JNI) | |
3738 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
3739 _number_of_non_daemon_threads++; | |
3740 daemon = false; | |
3741 } | |
3742 | |
3743 ThreadService::add_thread(p, daemon); | |
3744 | |
3745 // Possible GC point. | |
3746 Events::log("Thread added: " INTPTR_FORMAT, p); | |
3747 } | |
3748 | |
3749 void Threads::remove(JavaThread* p) { | |
3750 // Extra scope needed for Thread_lock, so we can check | |
3751 // that we do not remove thread without safepoint code notice | |
3752 { MutexLocker ml(Threads_lock); | |
3753 | |
3754 assert(includes(p), "p must be present"); | |
3755 | |
3756 JavaThread* current = _thread_list; | |
3757 JavaThread* prev = NULL; | |
3758 | |
3759 while (current != p) { | |
3760 prev = current; | |
3761 current = current->next(); | |
3762 } | |
3763 | |
3764 if (prev) { | |
3765 prev->set_next(current->next()); | |
3766 } else { | |
3767 _thread_list = p->next(); | |
3768 } | |
3769 _number_of_threads--; | |
3770 oop threadObj = p->threadObj(); | |
3771 bool daemon = true; | |
3772 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
3773 _number_of_non_daemon_threads--; | |
3774 daemon = false; | |
3775 | |
3776 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
3777 // on destroy_vm will wake up. | |
3778 if (number_of_non_daemon_threads() == 1) | |
3779 Threads_lock->notify_all(); | |
3780 } | |
3781 ThreadService::remove_thread(p, daemon); | |
3782 | |
3783 // Make sure that safepoint code disregard this thread. This is needed since | |
3784 // the thread might mess around with locks after this point. This can cause it | |
3785 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
3786 // of this thread since it is removed from the queue. | |
3787 p->set_terminated_value(); | |
3788 } // unlock Threads_lock | |
3789 | |
3790 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
3791 Events::log("Thread exited: " INTPTR_FORMAT, p); | |
3792 } | |
3793 | |
3794 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
3795 bool Threads::includes(JavaThread* p) { | |
3796 assert(Threads_lock->is_locked(), "sanity check"); | |
3797 ALL_JAVA_THREADS(q) { | |
3798 if (q == p ) { | |
3799 return true; | |
3800 } | |
3801 } | |
3802 return false; | |
3803 } | |
3804 | |
3805 // Operations on the Threads list for GC. These are not explicitly locked, | |
3806 // but the garbage collector must provide a safe context for them to run. | |
3807 // In particular, these things should never be called when the Threads_lock | |
3808 // is held by some other thread. (Note: the Safepoint abstraction also | |
3809 // uses the Threads_lock to gurantee this property. It also makes sure that | |
3810 // all threads gets blocked when exiting or starting). | |
3811 | |
989
148e5441d916
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844
diff
changeset
|
3812 void Threads::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 3813 ALL_JAVA_THREADS(p) { |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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844
diff
changeset
|
3814 p->oops_do(f, cf); |
0 | 3815 } |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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844
diff
changeset
|
3816 VMThread::vm_thread()->oops_do(f, cf); |
0 | 3817 } |
3818 | |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
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844
diff
changeset
|
3819 void Threads::possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 3820 // Introduce a mechanism allowing parallel threads to claim threads as |
3821 // root groups. Overhead should be small enough to use all the time, | |
3822 // even in sequential code. | |
3823 SharedHeap* sh = SharedHeap::heap(); | |
3824 bool is_par = (sh->n_par_threads() > 0); | |
3825 int cp = SharedHeap::heap()->strong_roots_parity(); | |
3826 ALL_JAVA_THREADS(p) { | |
3827 if (p->claim_oops_do(is_par, cp)) { | |
989
148e5441d916
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diff
changeset
|
3828 p->oops_do(f, cf); |
0 | 3829 } |
3830 } | |
3831 VMThread* vmt = VMThread::vm_thread(); | |
3832 if (vmt->claim_oops_do(is_par, cp)) | |
989
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changeset
|
3833 vmt->oops_do(f, cf); |
0 | 3834 } |
3835 | |
3836 #ifndef SERIALGC | |
3837 // Used by ParallelScavenge | |
3838 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
3839 ALL_JAVA_THREADS(p) { | |
3840 q->enqueue(new ThreadRootsTask(p)); | |
3841 } | |
3842 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
3843 } | |
3844 | |
3845 // Used by Parallel Old | |
3846 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
3847 ALL_JAVA_THREADS(p) { | |
3848 q->enqueue(new ThreadRootsMarkingTask(p)); | |
3849 } | |
3850 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
3851 } | |
3852 #endif // SERIALGC | |
3853 | |
989
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diff
changeset
|
3854 void Threads::nmethods_do(CodeBlobClosure* cf) { |
0 | 3855 ALL_JAVA_THREADS(p) { |
989
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diff
changeset
|
3856 p->nmethods_do(cf); |
0 | 3857 } |
989
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changeset
|
3858 VMThread::vm_thread()->nmethods_do(cf); |
0 | 3859 } |
3860 | |
3861 void Threads::gc_epilogue() { | |
3862 ALL_JAVA_THREADS(p) { | |
3863 p->gc_epilogue(); | |
3864 } | |
3865 } | |
3866 | |
3867 void Threads::gc_prologue() { | |
3868 ALL_JAVA_THREADS(p) { | |
3869 p->gc_prologue(); | |
3870 } | |
3871 } | |
3872 | |
3873 void Threads::deoptimized_wrt_marked_nmethods() { | |
3874 ALL_JAVA_THREADS(p) { | |
3875 p->deoptimized_wrt_marked_nmethods(); | |
3876 } | |
3877 } | |
3878 | |
3879 | |
3880 // Get count Java threads that are waiting to enter the specified monitor. | |
3881 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
3882 address monitor, bool doLock) { | |
3883 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
3884 "must grab Threads_lock or be at safepoint"); | |
3885 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
3886 | |
3887 int i = 0; | |
3888 { | |
3889 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
3890 ALL_JAVA_THREADS(p) { | |
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Thomas Wuerthinger <thomas.wuerthinger@gmail.com>
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3891 |
b30a2cd5e3a2
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changeset
|
3892 // (tw) May we do this? |
b30a2cd5e3a2
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3893 //if (p->is_Compiler_thread()) continue; |
0 | 3894 |
3895 address pending = (address)p->current_pending_monitor(); | |
3896 if (pending == monitor) { // found a match | |
3897 if (i < count) result->append(p); // save the first count matches | |
3898 i++; | |
3899 } | |
3900 } | |
3901 } | |
3902 return result; | |
3903 } | |
3904 | |
3905 | |
3906 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
3907 assert(doLock || | |
3908 Threads_lock->owned_by_self() || | |
3909 SafepointSynchronize::is_at_safepoint(), | |
3910 "must grab Threads_lock or be at safepoint"); | |
3911 | |
3912 // NULL owner means not locked so we can skip the search | |
3913 if (owner == NULL) return NULL; | |
3914 | |
3915 { | |
3916 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
3917 ALL_JAVA_THREADS(p) { | |
3918 // first, see if owner is the address of a Java thread | |
3919 if (owner == (address)p) return p; | |
3920 } | |
3921 } | |
3922 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
3923 if (UseHeavyMonitors) return NULL; | |
3924 | |
3925 // | |
3926 // If we didn't find a matching Java thread and we didn't force use of | |
3927 // heavyweight monitors, then the owner is the stack address of the | |
3928 // Lock Word in the owning Java thread's stack. | |
3929 // | |
3930 JavaThread* the_owner = NULL; | |
3931 { | |
3932 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
3933 ALL_JAVA_THREADS(q) { | |
702
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changeset
|
3934 if (q->is_lock_owned(owner)) { |
0 | 3935 the_owner = q; |
702
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changeset
|
3936 break; |
0 | 3937 } |
3938 } | |
3939 } | |
3940 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
3941 return the_owner; | |
3942 } | |
3943 | |
3944 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
3945 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
3946 char buf[32]; | |
3947 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
3948 | |
3949 st->print_cr("Full thread dump %s (%s %s):", | |
3950 Abstract_VM_Version::vm_name(), | |
3951 Abstract_VM_Version::vm_release(), | |
3952 Abstract_VM_Version::vm_info_string() | |
3953 ); | |
3954 st->cr(); | |
3955 | |
3956 #ifndef SERIALGC | |
3957 // Dump concurrent locks | |
3958 ConcurrentLocksDump concurrent_locks; | |
3959 if (print_concurrent_locks) { | |
3960 concurrent_locks.dump_at_safepoint(); | |
3961 } | |
3962 #endif // SERIALGC | |
3963 | |
3964 ALL_JAVA_THREADS(p) { | |
3965 ResourceMark rm; | |
3966 p->print_on(st); | |
3967 if (print_stacks) { | |
3968 if (internal_format) { | |
3969 p->trace_stack(); | |
3970 } else { | |
3971 p->print_stack_on(st); | |
3972 } | |
3973 } | |
3974 st->cr(); | |
3975 #ifndef SERIALGC | |
3976 if (print_concurrent_locks) { | |
3977 concurrent_locks.print_locks_on(p, st); | |
3978 } | |
3979 #endif // SERIALGC | |
3980 } | |
3981 | |
3982 VMThread::vm_thread()->print_on(st); | |
3983 st->cr(); | |
3984 Universe::heap()->print_gc_threads_on(st); | |
3985 WatcherThread* wt = WatcherThread::watcher_thread(); | |
3986 if (wt != NULL) wt->print_on(st); | |
3987 st->cr(); | |
3988 CompileBroker::print_compiler_threads_on(st); | |
3989 st->flush(); | |
3990 } | |
3991 | |
3992 // Threads::print_on_error() is called by fatal error handler. It's possible | |
3993 // that VM is not at safepoint and/or current thread is inside signal handler. | |
3994 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
3995 // memory (even in resource area), it might deadlock the error handler. | |
3996 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
3997 bool found_current = false; | |
3998 st->print_cr("Java Threads: ( => current thread )"); | |
3999 ALL_JAVA_THREADS(thread) { | |
4000 bool is_current = (current == thread); | |
4001 found_current = found_current || is_current; | |
4002 | |
4003 st->print("%s", is_current ? "=>" : " "); | |
4004 | |
4005 st->print(PTR_FORMAT, thread); | |
4006 st->print(" "); | |
4007 thread->print_on_error(st, buf, buflen); | |
4008 st->cr(); | |
4009 } | |
4010 st->cr(); | |
4011 | |
4012 st->print_cr("Other Threads:"); | |
4013 if (VMThread::vm_thread()) { | |
4014 bool is_current = (current == VMThread::vm_thread()); | |
4015 found_current = found_current || is_current; | |
4016 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
4017 | |
4018 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
4019 st->print(" "); | |
4020 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
4021 st->cr(); | |
4022 } | |
4023 WatcherThread* wt = WatcherThread::watcher_thread(); | |
4024 if (wt != NULL) { | |
4025 bool is_current = (current == wt); | |
4026 found_current = found_current || is_current; | |
4027 st->print("%s", is_current ? "=>" : " "); | |
4028 | |
4029 st->print(PTR_FORMAT, wt); | |
4030 st->print(" "); | |
4031 wt->print_on_error(st, buf, buflen); | |
4032 st->cr(); | |
4033 } | |
4034 if (!found_current) { | |
4035 st->cr(); | |
4036 st->print("=>" PTR_FORMAT " (exited) ", current); | |
4037 current->print_on_error(st, buf, buflen); | |
4038 st->cr(); | |
4039 } | |
4040 } | |
4041 | |
1878 | 4042 // Internal SpinLock and Mutex |
4043 // Based on ParkEvent | |
4044 | |
4045 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
0 | 4046 // |
1878 | 4047 // We employ SpinLocks _only for low-contention, fixed-length |
4048 // short-duration critical sections where we're concerned | |
4049 // about native mutex_t or HotSpot Mutex:: latency. | |
4050 // The mux construct provides a spin-then-block mutual exclusion | |
4051 // mechanism. | |
4052 // | |
4053 // Testing has shown that contention on the ListLock guarding gFreeList | |
4054 // is common. If we implement ListLock as a simple SpinLock it's common | |
4055 // for the JVM to devolve to yielding with little progress. This is true | |
4056 // despite the fact that the critical sections protected by ListLock are | |
4057 // extremely short. | |
0 | 4058 // |
1878 | 4059 // TODO-FIXME: ListLock should be of type SpinLock. |
4060 // We should make this a 1st-class type, integrated into the lock | |
4061 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
4062 // should have sufficient padding to avoid false-sharing and excessive | |
4063 // cache-coherency traffic. | |
4064 | |
4065 | |
4066 typedef volatile int SpinLockT ; | |
4067 | |
4068 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
4069 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
4070 return ; // normal fast-path return | |
4071 } | |
4072 | |
4073 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
4074 TEVENT (SpinAcquire - ctx) ; | |
4075 int ctr = 0 ; | |
4076 int Yields = 0 ; | |
0 | 4077 for (;;) { |
1878 | 4078 while (*adr != 0) { |
4079 ++ctr ; | |
4080 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
4081 if (Yields > 5) { | |
4082 // Consider using a simple NakedSleep() instead. | |
4083 // Then SpinAcquire could be called by non-JVM threads | |
4084 Thread::current()->_ParkEvent->park(1) ; | |
4085 } else { | |
4086 os::NakedYield() ; | |
4087 ++Yields ; | |
4088 } | |
4089 } else { | |
4090 SpinPause() ; | |
0 | 4091 } |
1878 | 4092 } |
4093 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
0 | 4094 } |
4095 } | |
4096 | |
1878 | 4097 void Thread::SpinRelease (volatile int * adr) { |
4098 assert (*adr != 0, "invariant") ; | |
4099 OrderAccess::fence() ; // guarantee at least release consistency. | |
4100 // Roach-motel semantics. | |
4101 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
4102 // but prior LDs and STs within the critical section can't be allowed | |
4103 // to reorder or float past the ST that releases the lock. | |
4104 *adr = 0 ; | |
0 | 4105 } |
4106 | |
1878 | 4107 // muxAcquire and muxRelease: |
4108 // | |
4109 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
4110 // The LSB of the word is set IFF the lock is held. | |
4111 // The remainder of the word points to the head of a singly-linked list | |
4112 // of threads blocked on the lock. | |
4113 // | |
4114 // * The current implementation of muxAcquire-muxRelease uses its own | |
4115 // dedicated Thread._MuxEvent instance. If we're interested in | |
4116 // minimizing the peak number of extant ParkEvent instances then | |
4117 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
4118 // as certain invariants were satisfied. Specifically, care would need | |
4119 // to be taken with regards to consuming unpark() "permits". | |
4120 // A safe rule of thumb is that a thread would never call muxAcquire() | |
4121 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
4122 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
4123 // consume an unpark() permit intended for monitorenter, for instance. | |
4124 // One way around this would be to widen the restricted-range semaphore | |
4125 // implemented in park(). Another alternative would be to provide | |
4126 // multiple instances of the PlatformEvent() for each thread. One | |
4127 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
4128 // | |
4129 // * Usage: | |
4130 // -- Only as leaf locks | |
4131 // -- for short-term locking only as muxAcquire does not perform | |
4132 // thread state transitions. | |
4133 // | |
4134 // Alternatives: | |
4135 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
4136 // but with parking or spin-then-park instead of pure spinning. | |
4137 // * Use Taura-Oyama-Yonenzawa locks. | |
4138 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
4139 // (List,LockByte). Acquire will CAS the full lockword while Release | |
4140 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
4141 // acquiring threads use timers (ParkTimed) to detect and recover from | |
4142 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
4143 // boundaries by using placement-new. | |
4144 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
4145 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
4146 // The validity of the backlinks must be ratified before we trust the value. | |
4147 // If the backlinks are invalid the exiting thread must back-track through the | |
4148 // the forward links, which are always trustworthy. | |
4149 // * Add a successor indication. The LockWord is currently encoded as | |
4150 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
4151 // to provide the usual futile-wakeup optimization. | |
4152 // See RTStt for details. | |
4153 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
4154 // | |
4155 | |
4156 | |
4157 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
4158 enum MuxBits { LOCKBIT = 1 } ; | |
4159 | |
4160 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
4161 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4162 if (w == 0) return ; | |
4163 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4164 return ; | |
4165 } | |
4166 | |
4167 TEVENT (muxAcquire - Contention) ; | |
4168 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
4169 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
0 | 4170 for (;;) { |
1878 | 4171 int its = (os::is_MP() ? 100 : 0) + 1 ; |
4172 | |
4173 // Optional spin phase: spin-then-park strategy | |
4174 while (--its >= 0) { | |
4175 w = *Lock ; | |
4176 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4177 return ; | |
4178 } | |
4179 } | |
4180 | |
4181 Self->reset() ; | |
4182 Self->OnList = intptr_t(Lock) ; | |
4183 // The following fence() isn't _strictly necessary as the subsequent | |
4184 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4185 OrderAccess::fence(); | |
4186 for (;;) { | |
4187 w = *Lock ; | |
4188 if ((w & LOCKBIT) == 0) { | |
4189 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4190 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
4191 return ; | |
4192 } | |
4193 continue ; // Interference -- *Lock changed -- Just retry | |
0 | 4194 } |
1878 | 4195 assert (w & LOCKBIT, "invariant") ; |
4196 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4197 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
4198 } | |
4199 | |
4200 while (Self->OnList != 0) { | |
4201 Self->park() ; | |
4202 } | |
0 | 4203 } |
4204 } | |
4205 | |
1878 | 4206 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
4207 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4208 if (w == 0) return ; | |
4209 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4210 return ; | |
4211 } | |
4212 | |
4213 TEVENT (muxAcquire - Contention) ; | |
4214 ParkEvent * ReleaseAfter = NULL ; | |
4215 if (ev == NULL) { | |
4216 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
4217 } | |
4218 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
4219 for (;;) { | |
4220 guarantee (ev->OnList == 0, "invariant") ; | |
4221 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
4222 | |
4223 // Optional spin phase: spin-then-park strategy | |
4224 while (--its >= 0) { | |
4225 w = *Lock ; | |
4226 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4227 if (ReleaseAfter != NULL) { | |
4228 ParkEvent::Release (ReleaseAfter) ; | |
4229 } | |
4230 return ; | |
4231 } | |
4232 } | |
4233 | |
4234 ev->reset() ; | |
4235 ev->OnList = intptr_t(Lock) ; | |
4236 // The following fence() isn't _strictly necessary as the subsequent | |
4237 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4238 OrderAccess::fence(); | |
4239 for (;;) { | |
4240 w = *Lock ; | |
4241 if ((w & LOCKBIT) == 0) { | |
4242 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4243 ev->OnList = 0 ; | |
4244 // We call ::Release while holding the outer lock, thus | |
4245 // artificially lengthening the critical section. | |
4246 // Consider deferring the ::Release() until the subsequent unlock(), | |
4247 // after we've dropped the outer lock. | |
4248 if (ReleaseAfter != NULL) { | |
4249 ParkEvent::Release (ReleaseAfter) ; | |
4250 } | |
4251 return ; | |
4252 } | |
4253 continue ; // Interference -- *Lock changed -- Just retry | |
4254 } | |
4255 assert (w & LOCKBIT, "invariant") ; | |
4256 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4257 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
4258 } | |
4259 | |
4260 while (ev->OnList != 0) { | |
4261 ev->park() ; | |
4262 } | |
4263 } | |
4264 } | |
4265 | |
4266 // Release() must extract a successor from the list and then wake that thread. | |
4267 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
4268 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
4269 // Release() would : | |
4270 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
4271 // (B) Extract a successor from the private list "in-hand" | |
4272 // (C) attempt to CAS() the residual back into *Lock over null. | |
4273 // If there were any newly arrived threads and the CAS() would fail. | |
4274 // In that case Release() would detach the RATs, re-merge the list in-hand | |
4275 // with the RATs and repeat as needed. Alternately, Release() might | |
4276 // detach and extract a successor, but then pass the residual list to the wakee. | |
4277 // The wakee would be responsible for reattaching and remerging before it | |
4278 // competed for the lock. | |
4279 // | |
4280 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
4281 // multiple concurrent pushers, but only one popper or detacher. | |
4282 // This implementation pops from the head of the list. This is unfair, | |
4283 // but tends to provide excellent throughput as hot threads remain hot. | |
4284 // (We wake recently run threads first). | |
4285 | |
4286 void Thread::muxRelease (volatile intptr_t * Lock) { | |
4287 for (;;) { | |
4288 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
4289 assert (w & LOCKBIT, "invariant") ; | |
4290 if (w == LOCKBIT) return ; | |
4291 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
4292 assert (List != NULL, "invariant") ; | |
4293 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
4294 ParkEvent * nxt = List->ListNext ; | |
4295 | |
4296 // The following CAS() releases the lock and pops the head element. | |
4297 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
4298 continue ; | |
4299 } | |
4300 List->OnList = 0 ; | |
4301 OrderAccess::fence() ; | |
4302 List->unpark () ; | |
4303 return ; | |
4304 } | |
4305 } | |
4306 | |
4307 | |
0 | 4308 void Threads::verify() { |
4309 ALL_JAVA_THREADS(p) { | |
4310 p->verify(); | |
4311 } | |
4312 VMThread* thread = VMThread::vm_thread(); | |
4313 if (thread != NULL) thread->verify(); | |
4314 } |