Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.cpp @ 3987:fd65bc7c09b6
Merge
author | tonyp |
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date | Thu, 06 Oct 2011 13:28:09 -0400 |
parents | f08d439fab8c 4dfb2df418f2 |
children | 23a1c8de9d51 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, 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" | |
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34 #include "interpreter/oopMapCache.hpp" |
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35 #include "jvmtifiles/jvmtiEnv.hpp" |
1972 | 36 #include "memory/oopFactory.hpp" |
37 #include "memory/universe.inline.hpp" | |
38 #include "oops/instanceKlass.hpp" | |
39 #include "oops/objArrayOop.hpp" | |
40 #include "oops/oop.inline.hpp" | |
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41 #include "oops/symbol.hpp" |
1972 | 42 #include "prims/jvm_misc.hpp" |
43 #include "prims/jvmtiExport.hpp" | |
44 #include "prims/jvmtiThreadState.hpp" | |
45 #include "prims/privilegedStack.hpp" | |
46 #include "runtime/aprofiler.hpp" | |
47 #include "runtime/arguments.hpp" | |
48 #include "runtime/biasedLocking.hpp" | |
49 #include "runtime/deoptimization.hpp" | |
50 #include "runtime/fprofiler.hpp" | |
51 #include "runtime/frame.inline.hpp" | |
52 #include "runtime/init.hpp" | |
53 #include "runtime/interfaceSupport.hpp" | |
54 #include "runtime/java.hpp" | |
55 #include "runtime/javaCalls.hpp" | |
56 #include "runtime/jniPeriodicChecker.hpp" | |
57 #include "runtime/memprofiler.hpp" | |
58 #include "runtime/mutexLocker.hpp" | |
59 #include "runtime/objectMonitor.hpp" | |
60 #include "runtime/osThread.hpp" | |
61 #include "runtime/safepoint.hpp" | |
62 #include "runtime/sharedRuntime.hpp" | |
63 #include "runtime/statSampler.hpp" | |
64 #include "runtime/stubRoutines.hpp" | |
65 #include "runtime/task.hpp" | |
66 #include "runtime/threadCritical.hpp" | |
67 #include "runtime/threadLocalStorage.hpp" | |
68 #include "runtime/vframe.hpp" | |
69 #include "runtime/vframeArray.hpp" | |
70 #include "runtime/vframe_hp.hpp" | |
71 #include "runtime/vmThread.hpp" | |
72 #include "runtime/vm_operations.hpp" | |
73 #include "services/attachListener.hpp" | |
74 #include "services/management.hpp" | |
75 #include "services/threadService.hpp" | |
76 #include "utilities/defaultStream.hpp" | |
77 #include "utilities/dtrace.hpp" | |
78 #include "utilities/events.hpp" | |
79 #include "utilities/preserveException.hpp" | |
80 #ifdef TARGET_OS_FAMILY_linux | |
81 # include "os_linux.inline.hpp" | |
82 # include "thread_linux.inline.hpp" | |
83 #endif | |
84 #ifdef TARGET_OS_FAMILY_solaris | |
85 # include "os_solaris.inline.hpp" | |
86 # include "thread_solaris.inline.hpp" | |
87 #endif | |
88 #ifdef TARGET_OS_FAMILY_windows | |
89 # include "os_windows.inline.hpp" | |
90 # include "thread_windows.inline.hpp" | |
91 #endif | |
3960 | 92 #ifdef TARGET_OS_FAMILY_bsd |
93 # include "os_bsd.inline.hpp" | |
94 # include "thread_bsd.inline.hpp" | |
95 #endif | |
1972 | 96 #ifndef SERIALGC |
97 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
98 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
99 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
100 #endif | |
101 #ifdef COMPILER1 | |
102 #include "c1/c1_Compiler.hpp" | |
103 #endif | |
104 #ifdef COMPILER2 | |
105 #include "opto/c2compiler.hpp" | |
106 #include "opto/idealGraphPrinter.hpp" | |
107 #endif | |
0 | 108 |
109 #ifdef DTRACE_ENABLED | |
110 | |
111 // Only bother with this argument setup if dtrace is available | |
112 | |
113 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); | |
114 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
115 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
116 intptr_t, intptr_t, bool); | |
117 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
118 intptr_t, intptr_t, bool); | |
119 | |
120 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
121 { \ | |
122 ResourceMark rm(this); \ | |
123 int len = 0; \ | |
124 const char* name = (javathread)->get_thread_name(); \ | |
125 len = strlen(name); \ | |
126 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
127 name, len, \ | |
128 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
129 (javathread)->osthread()->thread_id(), \ | |
130 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
131 } | |
132 | |
133 #else // ndef DTRACE_ENABLED | |
134 | |
135 #define DTRACE_THREAD_PROBE(probe, javathread) | |
136 | |
137 #endif // ndef DTRACE_ENABLED | |
138 | |
139 // Class hierarchy | |
140 // - Thread | |
141 // - VMThread | |
142 // - WatcherThread | |
143 // - ConcurrentMarkSweepThread | |
144 // - JavaThread | |
145 // - CompilerThread | |
146 | |
147 // ======= Thread ======== | |
148 | |
149 // Support for forcing alignment of thread objects for biased locking | |
150 void* Thread::operator new(size_t size) { | |
151 if (UseBiasedLocking) { | |
152 const int alignment = markOopDesc::biased_lock_alignment; | |
153 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
154 void* real_malloc_addr = CHeapObj::operator new(aligned_size); | |
155 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); | |
156 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
157 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
158 "JavaThread alignment code overflowed allocated storage"); | |
159 if (TraceBiasedLocking) { | |
160 if (aligned_addr != real_malloc_addr) | |
161 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
162 real_malloc_addr, aligned_addr); | |
163 } | |
164 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
165 return aligned_addr; | |
166 } else { | |
167 return CHeapObj::operator new(size); | |
168 } | |
169 } | |
170 | |
171 void Thread::operator delete(void* p) { | |
172 if (UseBiasedLocking) { | |
173 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
174 CHeapObj::operator delete(real_malloc_addr); | |
175 } else { | |
176 CHeapObj::operator delete(p); | |
177 } | |
178 } | |
179 | |
180 | |
181 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
182 // JavaThread | |
183 | |
184 | |
185 Thread::Thread() { | |
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186 // stack and get_thread |
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187 set_stack_base(NULL); |
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188 set_stack_size(0); |
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189 set_self_raw_id(0); |
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190 set_lgrp_id(-1); |
0 | 191 |
192 // allocated data structures | |
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193 set_osthread(NULL); |
0 | 194 set_resource_area(new ResourceArea()); |
195 set_handle_area(new HandleArea(NULL)); | |
196 set_active_handles(NULL); | |
197 set_free_handle_block(NULL); | |
198 set_last_handle_mark(NULL); | |
199 | |
200 // This initial value ==> never claimed. | |
201 _oops_do_parity = 0; | |
202 | |
203 // the handle mark links itself to last_handle_mark | |
204 new HandleMark(this); | |
205 | |
206 // plain initialization | |
207 debug_only(_owned_locks = NULL;) | |
208 debug_only(_allow_allocation_count = 0;) | |
209 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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210 NOT_PRODUCT(_skip_gcalot = false;) |
0 | 211 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
212 _jvmti_env_iteration_count = 0; | |
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213 set_allocated_bytes(0); |
0 | 214 _vm_operation_started_count = 0; |
215 _vm_operation_completed_count = 0; | |
216 _current_pending_monitor = NULL; | |
217 _current_pending_monitor_is_from_java = true; | |
218 _current_waiting_monitor = NULL; | |
219 _num_nested_signal = 0; | |
220 omFreeList = NULL ; | |
221 omFreeCount = 0 ; | |
222 omFreeProvision = 32 ; | |
1587 | 223 omInUseList = NULL ; |
224 omInUseCount = 0 ; | |
0 | 225 |
226 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); | |
227 _suspend_flags = 0; | |
228 | |
229 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
230 _hashStateX = os::random() ; | |
231 _hashStateY = 842502087 ; | |
232 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
233 _hashStateW = 273326509 ; | |
234 | |
235 _OnTrap = 0 ; | |
236 _schedctl = NULL ; | |
237 _Stalled = 0 ; | |
238 _TypeTag = 0x2BAD ; | |
239 | |
240 // Many of the following fields are effectively final - immutable | |
241 // Note that nascent threads can't use the Native Monitor-Mutex | |
242 // construct until the _MutexEvent is initialized ... | |
243 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
244 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
245 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
246 // and ::Release() | |
247 _ParkEvent = ParkEvent::Allocate (this) ; | |
248 _SleepEvent = ParkEvent::Allocate (this) ; | |
249 _MutexEvent = ParkEvent::Allocate (this) ; | |
250 _MuxEvent = ParkEvent::Allocate (this) ; | |
251 | |
252 #ifdef CHECK_UNHANDLED_OOPS | |
253 if (CheckUnhandledOops) { | |
254 _unhandled_oops = new UnhandledOops(this); | |
255 } | |
256 #endif // CHECK_UNHANDLED_OOPS | |
257 #ifdef ASSERT | |
258 if (UseBiasedLocking) { | |
259 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
260 assert(this == _real_malloc_address || | |
261 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
262 "bug in forced alignment of thread objects"); | |
263 } | |
264 #endif /* ASSERT */ | |
265 } | |
266 | |
267 void Thread::initialize_thread_local_storage() { | |
268 // Note: Make sure this method only calls | |
269 // non-blocking operations. Otherwise, it might not work | |
270 // with the thread-startup/safepoint interaction. | |
271 | |
272 // During Java thread startup, safepoint code should allow this | |
273 // method to complete because it may need to allocate memory to | |
274 // store information for the new thread. | |
275 | |
276 // initialize structure dependent on thread local storage | |
277 ThreadLocalStorage::set_thread(this); | |
278 | |
279 // set up any platform-specific state. | |
280 os::initialize_thread(); | |
281 | |
282 } | |
283 | |
284 void Thread::record_stack_base_and_size() { | |
285 set_stack_base(os::current_stack_base()); | |
286 set_stack_size(os::current_stack_size()); | |
287 } | |
288 | |
289 | |
290 Thread::~Thread() { | |
291 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
292 ObjectSynchronizer::omFlush (this) ; | |
293 | |
294 // deallocate data structures | |
295 delete resource_area(); | |
296 // since the handle marks are using the handle area, we have to deallocated the root | |
297 // handle mark before deallocating the thread's handle area, | |
298 assert(last_handle_mark() != NULL, "check we have an element"); | |
299 delete last_handle_mark(); | |
300 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
301 | |
302 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
303 // We NULL out the fields for good hygiene. | |
304 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
305 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
306 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
307 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
308 | |
309 delete handle_area(); | |
310 | |
311 // osthread() can be NULL, if creation of thread failed. | |
312 if (osthread() != NULL) os::free_thread(osthread()); | |
313 | |
314 delete _SR_lock; | |
315 | |
316 // clear thread local storage if the Thread is deleting itself | |
317 if (this == Thread::current()) { | |
318 ThreadLocalStorage::set_thread(NULL); | |
319 } else { | |
320 // In the case where we're not the current thread, invalidate all the | |
321 // caches in case some code tries to get the current thread or the | |
322 // thread that was destroyed, and gets stale information. | |
323 ThreadLocalStorage::invalidate_all(); | |
324 } | |
325 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
326 } | |
327 | |
328 // NOTE: dummy function for assertion purpose. | |
329 void Thread::run() { | |
330 ShouldNotReachHere(); | |
331 } | |
332 | |
333 #ifdef ASSERT | |
334 // Private method to check for dangling thread pointer | |
335 void check_for_dangling_thread_pointer(Thread *thread) { | |
336 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
337 "possibility of dangling Thread pointer"); | |
338 } | |
339 #endif | |
340 | |
341 | |
342 #ifndef PRODUCT | |
343 // Tracing method for basic thread operations | |
344 void Thread::trace(const char* msg, const Thread* const thread) { | |
345 if (!TraceThreadEvents) return; | |
346 ResourceMark rm; | |
347 ThreadCritical tc; | |
348 const char *name = "non-Java thread"; | |
349 int prio = -1; | |
350 if (thread->is_Java_thread() | |
351 && !thread->is_Compiler_thread()) { | |
352 // The Threads_lock must be held to get information about | |
353 // this thread but may not be in some situations when | |
354 // tracing thread events. | |
355 bool release_Threads_lock = false; | |
356 if (!Threads_lock->owned_by_self()) { | |
357 Threads_lock->lock(); | |
358 release_Threads_lock = true; | |
359 } | |
360 JavaThread* jt = (JavaThread *)thread; | |
361 name = (char *)jt->get_thread_name(); | |
362 oop thread_oop = jt->threadObj(); | |
363 if (thread_oop != NULL) { | |
364 prio = java_lang_Thread::priority(thread_oop); | |
365 } | |
366 if (release_Threads_lock) { | |
367 Threads_lock->unlock(); | |
368 } | |
369 } | |
370 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
371 } | |
372 #endif | |
373 | |
374 | |
375 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
376 trace("get priority", thread); | |
377 ThreadPriority priority; | |
378 // Can return an error! | |
379 (void)os::get_priority(thread, priority); | |
380 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
381 return priority; | |
382 } | |
383 | |
384 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
385 trace("set priority", thread); | |
386 debug_only(check_for_dangling_thread_pointer(thread);) | |
387 // Can return an error! | |
388 (void)os::set_priority(thread, priority); | |
389 } | |
390 | |
391 | |
392 void Thread::start(Thread* thread) { | |
393 trace("start", thread); | |
394 // Start is different from resume in that its safety is guaranteed by context or | |
395 // being called from a Java method synchronized on the Thread object. | |
396 if (!DisableStartThread) { | |
397 if (thread->is_Java_thread()) { | |
398 // Initialize the thread state to RUNNABLE before starting this thread. | |
399 // Can not set it after the thread started because we do not know the | |
400 // exact thread state at that time. It could be in MONITOR_WAIT or | |
401 // in SLEEPING or some other state. | |
402 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
403 java_lang_Thread::RUNNABLE); | |
404 } | |
405 os::start_thread(thread); | |
406 } | |
407 } | |
408 | |
409 // Enqueue a VM_Operation to do the job for us - sometime later | |
410 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
411 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
412 VMThread::execute(vm_stop); | |
413 } | |
414 | |
415 | |
416 // | |
417 // Check if an external suspend request has completed (or has been | |
418 // cancelled). Returns true if the thread is externally suspended and | |
419 // false otherwise. | |
420 // | |
421 // The bits parameter returns information about the code path through | |
422 // the routine. Useful for debugging: | |
423 // | |
424 // set in is_ext_suspend_completed(): | |
425 // 0x00000001 - routine was entered | |
426 // 0x00000010 - routine return false at end | |
427 // 0x00000100 - thread exited (return false) | |
428 // 0x00000200 - suspend request cancelled (return false) | |
429 // 0x00000400 - thread suspended (return true) | |
430 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
431 // 0x00002000 - thread is native and walkable (return true) | |
432 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
433 // | |
434 // set in wait_for_ext_suspend_completion(): | |
435 // 0x00010000 - routine was entered | |
436 // 0x00020000 - suspend request cancelled before loop (return false) | |
437 // 0x00040000 - thread suspended before loop (return true) | |
438 // 0x00080000 - suspend request cancelled in loop (return false) | |
439 // 0x00100000 - thread suspended in loop (return true) | |
440 // 0x00200000 - suspend not completed during retry loop (return false) | |
441 // | |
442 | |
443 // Helper class for tracing suspend wait debug bits. | |
444 // | |
445 // 0x00000100 indicates that the target thread exited before it could | |
446 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
447 // 0x00080000 each indicate a cancelled suspend request so they don't | |
448 // count as wait failures either. | |
449 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
450 | |
451 class TraceSuspendDebugBits : public StackObj { | |
452 private: | |
453 JavaThread * jt; | |
454 bool is_wait; | |
455 bool called_by_wait; // meaningful when !is_wait | |
456 uint32_t * bits; | |
457 | |
458 public: | |
459 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
460 uint32_t *_bits) { | |
461 jt = _jt; | |
462 is_wait = _is_wait; | |
463 called_by_wait = _called_by_wait; | |
464 bits = _bits; | |
465 } | |
466 | |
467 ~TraceSuspendDebugBits() { | |
468 if (!is_wait) { | |
469 #if 1 | |
470 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
471 // That trace is very chatty. | |
472 return; | |
473 #else | |
474 if (!called_by_wait) { | |
475 // If tracing for is_ext_suspend_completed() is enabled, then only | |
476 // trace calls to it from wait_for_ext_suspend_completion() | |
477 return; | |
478 } | |
479 #endif | |
480 } | |
481 | |
482 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
483 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
484 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
485 ResourceMark rm; | |
486 | |
487 tty->print_cr( | |
488 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
489 jt->get_thread_name(), *bits); | |
490 | |
491 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
492 } | |
493 } | |
494 } | |
495 }; | |
496 #undef DEBUG_FALSE_BITS | |
497 | |
498 | |
499 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
500 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
501 | |
502 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
503 bool do_trans_retry; // flag to force the retry | |
504 | |
505 *bits |= 0x00000001; | |
506 | |
507 do { | |
508 do_trans_retry = false; | |
509 | |
510 if (is_exiting()) { | |
511 // Thread is in the process of exiting. This is always checked | |
512 // first to reduce the risk of dereferencing a freed JavaThread. | |
513 *bits |= 0x00000100; | |
514 return false; | |
515 } | |
516 | |
517 if (!is_external_suspend()) { | |
518 // Suspend request is cancelled. This is always checked before | |
519 // is_ext_suspended() to reduce the risk of a rogue resume | |
520 // confusing the thread that made the suspend request. | |
521 *bits |= 0x00000200; | |
522 return false; | |
523 } | |
524 | |
525 if (is_ext_suspended()) { | |
526 // thread is suspended | |
527 *bits |= 0x00000400; | |
528 return true; | |
529 } | |
530 | |
531 // Now that we no longer do hard suspends of threads running | |
532 // native code, the target thread can be changing thread state | |
533 // while we are in this routine: | |
534 // | |
535 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
536 // | |
537 // We save a copy of the thread state as observed at this moment | |
538 // and make our decision about suspend completeness based on the | |
539 // copy. This closes the race where the thread state is seen as | |
540 // _thread_in_native_trans in the if-thread_blocked check, but is | |
541 // seen as _thread_blocked in if-thread_in_native_trans check. | |
542 JavaThreadState save_state = thread_state(); | |
543 | |
544 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
545 // If the thread's state is _thread_blocked and this blocking | |
546 // condition is known to be equivalent to a suspend, then we can | |
547 // consider the thread to be externally suspended. This means that | |
548 // the code that sets _thread_blocked has been modified to do | |
549 // self-suspension if the blocking condition releases. We also | |
550 // used to check for CONDVAR_WAIT here, but that is now covered by | |
551 // the _thread_blocked with self-suspension check. | |
552 // | |
553 // Return true since we wouldn't be here unless there was still an | |
554 // external suspend request. | |
555 *bits |= 0x00001000; | |
556 return true; | |
557 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
558 // Threads running native code will self-suspend on native==>VM/Java | |
559 // transitions. If its stack is walkable (should always be the case | |
560 // unless this function is called before the actual java_suspend() | |
561 // call), then the wait is done. | |
562 *bits |= 0x00002000; | |
563 return true; | |
564 } else if (!called_by_wait && !did_trans_retry && | |
565 save_state == _thread_in_native_trans && | |
566 frame_anchor()->walkable()) { | |
567 // The thread is transitioning from thread_in_native to another | |
568 // thread state. check_safepoint_and_suspend_for_native_trans() | |
569 // will force the thread to self-suspend. If it hasn't gotten | |
570 // there yet we may have caught the thread in-between the native | |
571 // code check above and the self-suspend. Lucky us. If we were | |
572 // called by wait_for_ext_suspend_completion(), then it | |
573 // will be doing the retries so we don't have to. | |
574 // | |
575 // Since we use the saved thread state in the if-statement above, | |
576 // there is a chance that the thread has already transitioned to | |
577 // _thread_blocked by the time we get here. In that case, we will | |
578 // make a single unnecessary pass through the logic below. This | |
579 // doesn't hurt anything since we still do the trans retry. | |
580 | |
581 *bits |= 0x00004000; | |
582 | |
583 // Once the thread leaves thread_in_native_trans for another | |
584 // thread state, we break out of this retry loop. We shouldn't | |
585 // need this flag to prevent us from getting back here, but | |
586 // sometimes paranoia is good. | |
587 did_trans_retry = true; | |
588 | |
589 // We wait for the thread to transition to a more usable state. | |
590 for (int i = 1; i <= SuspendRetryCount; i++) { | |
591 // We used to do an "os::yield_all(i)" call here with the intention | |
592 // that yielding would increase on each retry. However, the parameter | |
593 // is ignored on Linux which means the yield didn't scale up. Waiting | |
594 // on the SR_lock below provides a much more predictable scale up for | |
595 // the delay. It also provides a simple/direct point to check for any | |
596 // safepoint requests from the VMThread | |
597 | |
598 // temporarily drops SR_lock while doing wait with safepoint check | |
599 // (if we're a JavaThread - the WatcherThread can also call this) | |
600 // and increase delay with each retry | |
601 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
602 | |
603 // check the actual thread state instead of what we saved above | |
604 if (thread_state() != _thread_in_native_trans) { | |
605 // the thread has transitioned to another thread state so | |
606 // try all the checks (except this one) one more time. | |
607 do_trans_retry = true; | |
608 break; | |
609 } | |
610 } // end retry loop | |
611 | |
612 | |
613 } | |
614 } while (do_trans_retry); | |
615 | |
616 *bits |= 0x00000010; | |
617 return false; | |
618 } | |
619 | |
620 // | |
621 // Wait for an external suspend request to complete (or be cancelled). | |
622 // Returns true if the thread is externally suspended and false otherwise. | |
623 // | |
624 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
625 uint32_t *bits) { | |
626 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
627 false /* !called_by_wait */, bits); | |
628 | |
629 // local flag copies to minimize SR_lock hold time | |
630 bool is_suspended; | |
631 bool pending; | |
632 uint32_t reset_bits; | |
633 | |
634 // set a marker so is_ext_suspend_completed() knows we are the caller | |
635 *bits |= 0x00010000; | |
636 | |
637 // We use reset_bits to reinitialize the bits value at the top of | |
638 // each retry loop. This allows the caller to make use of any | |
639 // unused bits for their own marking purposes. | |
640 reset_bits = *bits; | |
641 | |
642 { | |
643 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
644 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
645 delay, bits); | |
646 pending = is_external_suspend(); | |
647 } | |
648 // must release SR_lock to allow suspension to complete | |
649 | |
650 if (!pending) { | |
651 // A cancelled suspend request is the only false return from | |
652 // is_ext_suspend_completed() that keeps us from entering the | |
653 // retry loop. | |
654 *bits |= 0x00020000; | |
655 return false; | |
656 } | |
657 | |
658 if (is_suspended) { | |
659 *bits |= 0x00040000; | |
660 return true; | |
661 } | |
662 | |
663 for (int i = 1; i <= retries; i++) { | |
664 *bits = reset_bits; // reinit to only track last retry | |
665 | |
666 // We used to do an "os::yield_all(i)" call here with the intention | |
667 // that yielding would increase on each retry. However, the parameter | |
668 // is ignored on Linux which means the yield didn't scale up. Waiting | |
669 // on the SR_lock below provides a much more predictable scale up for | |
670 // the delay. It also provides a simple/direct point to check for any | |
671 // safepoint requests from the VMThread | |
672 | |
673 { | |
674 MutexLocker ml(SR_lock()); | |
675 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
676 // can also call this) and increase delay with each retry | |
677 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
678 | |
679 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
680 delay, bits); | |
681 | |
682 // It is possible for the external suspend request to be cancelled | |
683 // (by a resume) before the actual suspend operation is completed. | |
684 // Refresh our local copy to see if we still need to wait. | |
685 pending = is_external_suspend(); | |
686 } | |
687 | |
688 if (!pending) { | |
689 // A cancelled suspend request is the only false return from | |
690 // is_ext_suspend_completed() that keeps us from staying in the | |
691 // retry loop. | |
692 *bits |= 0x00080000; | |
693 return false; | |
694 } | |
695 | |
696 if (is_suspended) { | |
697 *bits |= 0x00100000; | |
698 return true; | |
699 } | |
700 } // end retry loop | |
701 | |
702 // thread did not suspend after all our retries | |
703 *bits |= 0x00200000; | |
704 return false; | |
705 } | |
706 | |
707 #ifndef PRODUCT | |
708 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
709 | |
710 // This should not need to be atomic as the only way for simultaneous | |
711 // updates is via interrupts. Even then this should be rare or non-existant | |
712 // and we don't care that much anyway. | |
713 | |
714 int index = _jmp_ring_index; | |
715 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
716 _jmp_ring[index]._target = (intptr_t) target; | |
717 _jmp_ring[index]._instruction = (intptr_t) instr; | |
718 _jmp_ring[index]._file = file; | |
719 _jmp_ring[index]._line = line; | |
720 } | |
721 #endif /* PRODUCT */ | |
722 | |
723 // Called by flat profiler | |
724 // Callers have already called wait_for_ext_suspend_completion | |
725 // The assertion for that is currently too complex to put here: | |
726 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
727 bool gotframe = false; | |
728 // self suspension saves needed state. | |
729 if (has_last_Java_frame() && _anchor.walkable()) { | |
730 *_fr = pd_last_frame(); | |
731 gotframe = true; | |
732 } | |
733 return gotframe; | |
734 } | |
735 | |
736 void Thread::interrupt(Thread* thread) { | |
737 trace("interrupt", thread); | |
738 debug_only(check_for_dangling_thread_pointer(thread);) | |
739 os::interrupt(thread); | |
740 } | |
741 | |
742 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
743 trace("is_interrupted", thread); | |
744 debug_only(check_for_dangling_thread_pointer(thread);) | |
745 // Note: If clear_interrupted==false, this simply fetches and | |
746 // returns the value of the field osthread()->interrupted(). | |
747 return os::is_interrupted(thread, clear_interrupted); | |
748 } | |
749 | |
750 | |
751 // GC Support | |
752 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
753 jint thread_parity = _oops_do_parity; | |
754 if (thread_parity != strong_roots_parity) { | |
755 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
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756 if (res == thread_parity) { |
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757 return true; |
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758 } else { |
0 | 759 guarantee(res == strong_roots_parity, "Or else what?"); |
760 assert(SharedHeap::heap()->n_par_threads() > 0, | |
761 "Should only fail when parallel."); | |
762 return false; | |
763 } | |
764 } | |
765 assert(SharedHeap::heap()->n_par_threads() > 0, | |
766 "Should only fail when parallel."); | |
767 return false; | |
768 } | |
769 | |
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770 void Thread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 771 active_handles()->oops_do(f); |
772 // Do oop for ThreadShadow | |
773 f->do_oop((oop*)&_pending_exception); | |
774 handle_area()->oops_do(f); | |
775 } | |
776 | |
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777 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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778 // no nmethods in a generic thread... |
0 | 779 } |
780 | |
781 void Thread::print_on(outputStream* st) const { | |
782 // get_priority assumes osthread initialized | |
783 if (osthread() != NULL) { | |
784 st->print("prio=%d tid=" INTPTR_FORMAT " ", get_priority(this), this); | |
785 osthread()->print_on(st); | |
786 } | |
787 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
788 } | |
789 | |
790 // Thread::print_on_error() is called by fatal error handler. Don't use | |
791 // any lock or allocate memory. | |
792 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
793 if (is_VM_thread()) st->print("VMThread"); | |
794 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
795 else if (is_Java_thread()) st->print("JavaThread"); | |
796 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
797 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
798 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
799 else st->print("Thread"); | |
800 | |
801 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
802 _stack_base - _stack_size, _stack_base); | |
803 | |
804 if (osthread()) { | |
805 st->print(" [id=%d]", osthread()->thread_id()); | |
806 } | |
807 } | |
808 | |
809 #ifdef ASSERT | |
810 void Thread::print_owned_locks_on(outputStream* st) const { | |
811 Monitor *cur = _owned_locks; | |
812 if (cur == NULL) { | |
813 st->print(" (no locks) "); | |
814 } else { | |
815 st->print_cr(" Locks owned:"); | |
816 while(cur) { | |
817 cur->print_on(st); | |
818 cur = cur->next(); | |
819 } | |
820 } | |
821 } | |
822 | |
823 static int ref_use_count = 0; | |
824 | |
825 bool Thread::owns_locks_but_compiled_lock() const { | |
826 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
827 if (cur != Compile_lock) return true; | |
828 } | |
829 return false; | |
830 } | |
831 | |
832 | |
833 #endif | |
834 | |
835 #ifndef PRODUCT | |
836 | |
837 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
838 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
839 // no threads which allow_vm_block's are held | |
840 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
841 // Check if current thread is allowed to block at a safepoint | |
842 if (!(_allow_safepoint_count == 0)) | |
843 fatal("Possible safepoint reached by thread that does not allow it"); | |
844 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
845 fatal("LEAF method calling lock?"); | |
846 } | |
847 | |
848 #ifdef ASSERT | |
849 if (potential_vm_operation && is_Java_thread() | |
850 && !Universe::is_bootstrapping()) { | |
851 // Make sure we do not hold any locks that the VM thread also uses. | |
852 // This could potentially lead to deadlocks | |
853 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
854 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
855 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
856 // since it is used to transfer control between JavaThreads and the VMThread | |
857 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
858 if ( (cur->allow_vm_block() && | |
859 cur != Threads_lock && | |
860 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
861 cur != VMOperationRequest_lock && | |
862 cur != VMOperationQueue_lock) || | |
863 cur->rank() == Mutex::special) { | |
864 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
865 } | |
866 } | |
867 } | |
868 | |
869 if (GCALotAtAllSafepoints) { | |
870 // We could enter a safepoint here and thus have a gc | |
871 InterfaceSupport::check_gc_alot(); | |
872 } | |
873 #endif | |
874 } | |
875 #endif | |
876 | |
877 bool Thread::is_in_stack(address adr) const { | |
878 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
879 address end = os::current_stack_pointer(); | |
880 if (stack_base() >= adr && adr >= end) return true; | |
881 | |
882 return false; | |
883 } | |
884 | |
885 | |
886 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
887 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
888 // used for compilation in the future. If that change is made, the need for these methods | |
889 // should be revisited, and they should be removed if possible. | |
890 | |
891 bool Thread::is_lock_owned(address adr) const { | |
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892 return on_local_stack(adr); |
0 | 893 } |
894 | |
895 bool Thread::set_as_starting_thread() { | |
896 // NOTE: this must be called inside the main thread. | |
897 return os::create_main_thread((JavaThread*)this); | |
898 } | |
899 | |
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900 static void initialize_class(Symbol* class_name, TRAPS) { |
0 | 901 klassOop klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
902 instanceKlass::cast(klass)->initialize(CHECK); | |
903 } | |
904 | |
905 | |
906 // Creates the initial ThreadGroup | |
907 static Handle create_initial_thread_group(TRAPS) { | |
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908 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
0 | 909 instanceKlassHandle klass (THREAD, k); |
910 | |
911 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
912 { | |
913 JavaValue result(T_VOID); | |
914 JavaCalls::call_special(&result, | |
915 system_instance, | |
916 klass, | |
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917 vmSymbols::object_initializer_name(), |
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918 vmSymbols::void_method_signature(), |
0 | 919 CHECK_NH); |
920 } | |
921 Universe::set_system_thread_group(system_instance()); | |
922 | |
923 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
924 { | |
925 JavaValue result(T_VOID); | |
926 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
927 JavaCalls::call_special(&result, | |
928 main_instance, | |
929 klass, | |
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930 vmSymbols::object_initializer_name(), |
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931 vmSymbols::threadgroup_string_void_signature(), |
0 | 932 system_instance, |
933 string, | |
934 CHECK_NH); | |
935 } | |
936 return main_instance; | |
937 } | |
938 | |
939 // Creates the initial Thread | |
940 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
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941 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
0 | 942 instanceKlassHandle klass (THREAD, k); |
943 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
944 | |
945 java_lang_Thread::set_thread(thread_oop(), thread); | |
946 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
947 thread->set_threadObj(thread_oop()); | |
948 | |
949 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
950 | |
951 JavaValue result(T_VOID); | |
952 JavaCalls::call_special(&result, thread_oop, | |
953 klass, | |
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954 vmSymbols::object_initializer_name(), |
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955 vmSymbols::threadgroup_string_void_signature(), |
0 | 956 thread_group, |
957 string, | |
958 CHECK_NULL); | |
959 return thread_oop(); | |
960 } | |
961 | |
962 static void call_initializeSystemClass(TRAPS) { | |
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963 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 964 instanceKlassHandle klass (THREAD, k); |
965 | |
966 JavaValue result(T_VOID); | |
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967 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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968 vmSymbols::void_method_signature(), CHECK); |
0 | 969 } |
970 | |
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971 // General purpose hook into Java code, run once when the VM is initialized. |
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972 // The Java library method itself may be changed independently from the VM. |
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973 static void call_postVMInitHook(TRAPS) { |
3938 | 974 klassOop k = SystemDictionary::PostVMInitHook_klass(); |
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975 instanceKlassHandle klass (THREAD, k); |
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976 if (klass.not_null()) { |
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977 JavaValue result(T_VOID); |
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978 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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979 vmSymbols::void_method_signature(), |
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980 CHECK); |
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981 } |
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982 } |
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983 |
0 | 984 static void reset_vm_info_property(TRAPS) { |
985 // the vm info string | |
986 ResourceMark rm(THREAD); | |
987 const char *vm_info = VM_Version::vm_info_string(); | |
988 | |
989 // java.lang.System class | |
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990 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 991 instanceKlassHandle klass (THREAD, k); |
992 | |
993 // setProperty arguments | |
994 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
995 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
996 | |
997 // return value | |
998 JavaValue r(T_OBJECT); | |
999 | |
1000 // public static String setProperty(String key, String value); | |
1001 JavaCalls::call_static(&r, | |
1002 klass, | |
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1003 vmSymbols::setProperty_name(), |
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1004 vmSymbols::string_string_string_signature(), |
0 | 1005 key_str, |
1006 value_str, | |
1007 CHECK); | |
1008 } | |
1009 | |
1010 | |
1011 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
1012 assert(thread_group.not_null(), "thread group should be specified"); | |
1013 assert(threadObj() == NULL, "should only create Java thread object once"); | |
1014 | |
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1015 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
0 | 1016 instanceKlassHandle klass (THREAD, k); |
1017 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
1018 | |
1019 java_lang_Thread::set_thread(thread_oop(), this); | |
1020 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1021 set_threadObj(thread_oop()); | |
1022 | |
1023 JavaValue result(T_VOID); | |
1024 if (thread_name != NULL) { | |
1025 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
1026 // Thread gets assigned specified name and null target | |
1027 JavaCalls::call_special(&result, | |
1028 thread_oop, | |
1029 klass, | |
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1030 vmSymbols::object_initializer_name(), |
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1031 vmSymbols::threadgroup_string_void_signature(), |
0 | 1032 thread_group, // Argument 1 |
1033 name, // Argument 2 | |
1034 THREAD); | |
1035 } else { | |
1036 // Thread gets assigned name "Thread-nnn" and null target | |
1037 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
1038 JavaCalls::call_special(&result, | |
1039 thread_oop, | |
1040 klass, | |
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1041 vmSymbols::object_initializer_name(), |
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1042 vmSymbols::threadgroup_runnable_void_signature(), |
0 | 1043 thread_group, // Argument 1 |
1044 Handle(), // Argument 2 | |
1045 THREAD); | |
1046 } | |
1047 | |
1048 | |
1049 if (daemon) { | |
1050 java_lang_Thread::set_daemon(thread_oop()); | |
1051 } | |
1052 | |
1053 if (HAS_PENDING_EXCEPTION) { | |
1054 return; | |
1055 } | |
1056 | |
1142 | 1057 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
0 | 1058 Handle threadObj(this, this->threadObj()); |
1059 | |
1060 JavaCalls::call_special(&result, | |
1061 thread_group, | |
1062 group, | |
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1063 vmSymbols::add_method_name(), |
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1064 vmSymbols::thread_void_signature(), |
0 | 1065 threadObj, // Arg 1 |
1066 THREAD); | |
1067 | |
1068 | |
1069 } | |
1070 | |
1071 // NamedThread -- non-JavaThread subclasses with multiple | |
1072 // uniquely named instances should derive from this. | |
1073 NamedThread::NamedThread() : Thread() { | |
1074 _name = NULL; | |
1119
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1075 _processed_thread = NULL; |
0 | 1076 } |
1077 | |
1078 NamedThread::~NamedThread() { | |
1079 if (_name != NULL) { | |
1080 FREE_C_HEAP_ARRAY(char, _name); | |
1081 _name = NULL; | |
1082 } | |
1083 } | |
1084 | |
1085 void NamedThread::set_name(const char* format, ...) { | |
1086 guarantee(_name == NULL, "Only get to set name once."); | |
1087 _name = NEW_C_HEAP_ARRAY(char, max_name_len); | |
1088 guarantee(_name != NULL, "alloc failure"); | |
1089 va_list ap; | |
1090 va_start(ap, format); | |
1091 jio_vsnprintf(_name, max_name_len, format, ap); | |
1092 va_end(ap); | |
1093 } | |
1094 | |
1095 // ======= WatcherThread ======== | |
1096 | |
1097 // The watcher thread exists to simulate timer interrupts. It should | |
1098 // be replaced by an abstraction over whatever native support for | |
1099 // timer interrupts exists on the platform. | |
1100 | |
1101 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
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1102 volatile bool WatcherThread::_should_terminate = false; |
0 | 1103 |
1104 WatcherThread::WatcherThread() : Thread() { | |
1105 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
1106 if (os::create_thread(this, os::watcher_thread)) { | |
1107 _watcher_thread = this; | |
1108 | |
1109 // Set the watcher thread to the highest OS priority which should not be | |
1110 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
1111 // is created. The only normal thread using this priority is the reference | |
1112 // handler thread, which runs for very short intervals only. | |
1113 // If the VMThread's priority is not lower than the WatcherThread profiling | |
1114 // will be inaccurate. | |
1115 os::set_priority(this, MaxPriority); | |
1116 if (!DisableStartThread) { | |
1117 os::start_thread(this); | |
1118 } | |
1119 } | |
1120 } | |
1121 | |
1122 void WatcherThread::run() { | |
1123 assert(this == watcher_thread(), "just checking"); | |
1124 | |
1125 this->record_stack_base_and_size(); | |
1126 this->initialize_thread_local_storage(); | |
1127 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1128 while(!_should_terminate) { | |
1129 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
1130 assert(watcher_thread() == this, "thread consistency check"); | |
1131 | |
1132 // Calculate how long it'll be until the next PeriodicTask work | |
1133 // should be done, and sleep that amount of time. | |
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1134 size_t time_to_wait = PeriodicTask::time_to_wait(); |
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1135 |
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1136 // we expect this to timeout - we only ever get unparked when |
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1137 // we should terminate |
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1138 { |
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1139 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1140 |
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1141 jlong prev_time = os::javaTimeNanos(); |
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1142 for (;;) { |
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1143 int res= _SleepEvent->park(time_to_wait); |
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1144 if (res == OS_TIMEOUT || _should_terminate) |
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1145 break; |
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1146 // spurious wakeup of some kind |
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1147 jlong now = os::javaTimeNanos(); |
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1148 time_to_wait -= (now - prev_time) / 1000000; |
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1149 if (time_to_wait <= 0) |
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1150 break; |
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1151 prev_time = now; |
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1152 } |
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1153 } |
0 | 1154 |
1155 if (is_error_reported()) { | |
1156 // A fatal error has happened, the error handler(VMError::report_and_die) | |
1157 // should abort JVM after creating an error log file. However in some | |
1158 // rare cases, the error handler itself might deadlock. Here we try to | |
1159 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
1160 // | |
1161 // This code is in WatcherThread because WatcherThread wakes up | |
1162 // periodically so the fatal error handler doesn't need to do anything; | |
1163 // also because the WatcherThread is less likely to crash than other | |
1164 // threads. | |
1165 | |
1166 for (;;) { | |
1167 if (!ShowMessageBoxOnError | |
1168 && (OnError == NULL || OnError[0] == '\0') | |
1169 && Arguments::abort_hook() == NULL) { | |
1170 os::sleep(this, 2 * 60 * 1000, false); | |
1171 fdStream err(defaultStream::output_fd()); | |
1172 err.print_raw_cr("# [ timer expired, abort... ]"); | |
1173 // skip atexit/vm_exit/vm_abort hooks | |
1174 os::die(); | |
1175 } | |
1176 | |
1177 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
1178 // ShowMessageBoxOnError when it is ready to abort. | |
1179 os::sleep(this, 5 * 1000, false); | |
1180 } | |
1181 } | |
1182 | |
1183 PeriodicTask::real_time_tick(time_to_wait); | |
1184 | |
1185 // If we have no more tasks left due to dynamic disenrollment, | |
1186 // shut down the thread since we don't currently support dynamic enrollment | |
1187 if (PeriodicTask::num_tasks() == 0) { | |
1188 _should_terminate = true; | |
1189 } | |
1190 } | |
1191 | |
1192 // Signal that it is terminated | |
1193 { | |
1194 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
1195 _watcher_thread = NULL; | |
1196 Terminator_lock->notify(); | |
1197 } | |
1198 | |
1199 // Thread destructor usually does this.. | |
1200 ThreadLocalStorage::set_thread(NULL); | |
1201 } | |
1202 | |
1203 void WatcherThread::start() { | |
1204 if (watcher_thread() == NULL) { | |
1205 _should_terminate = false; | |
1206 // Create the single instance of WatcherThread | |
1207 new WatcherThread(); | |
1208 } | |
1209 } | |
1210 | |
1211 void WatcherThread::stop() { | |
1212 // it is ok to take late safepoints here, if needed | |
1213 MutexLocker mu(Terminator_lock); | |
1214 _should_terminate = true; | |
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1215 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1216 |
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1217 Thread* watcher = watcher_thread(); |
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1218 if (watcher != NULL) |
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1219 watcher->_SleepEvent->unpark(); |
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1220 |
0 | 1221 while(watcher_thread() != NULL) { |
1222 // This wait should make safepoint checks, wait without a timeout, | |
1223 // and wait as a suspend-equivalent condition. | |
1224 // | |
1225 // Note: If the FlatProfiler is running, then this thread is waiting | |
1226 // for the WatcherThread to terminate and the WatcherThread, via the | |
1227 // FlatProfiler task, is waiting for the external suspend request on | |
1228 // this thread to complete. wait_for_ext_suspend_completion() will | |
1229 // eventually timeout, but that takes time. Making this wait a | |
1230 // suspend-equivalent condition solves that timeout problem. | |
1231 // | |
1232 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
1233 Mutex::_as_suspend_equivalent_flag); | |
1234 } | |
1235 } | |
1236 | |
1237 void WatcherThread::print_on(outputStream* st) const { | |
1238 st->print("\"%s\" ", name()); | |
1239 Thread::print_on(st); | |
1240 st->cr(); | |
1241 } | |
1242 | |
1243 // ======= JavaThread ======== | |
1244 | |
1245 // A JavaThread is a normal Java thread | |
1246 | |
1247 void JavaThread::initialize() { | |
1248 // Initialize fields | |
342
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1249 |
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1250 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1251 set_claimed_par_id(-1); |
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1252 |
0 | 1253 set_saved_exception_pc(NULL); |
1254 set_threadObj(NULL); | |
1255 _anchor.clear(); | |
1256 set_entry_point(NULL); | |
1257 set_jni_functions(jni_functions()); | |
1258 set_callee_target(NULL); | |
1259 set_vm_result(NULL); | |
1260 set_vm_result_2(NULL); | |
1261 set_vframe_array_head(NULL); | |
1262 set_vframe_array_last(NULL); | |
1263 set_deferred_locals(NULL); | |
1264 set_deopt_mark(NULL); | |
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1265 set_deopt_nmethod(NULL); |
0 | 1266 clear_must_deopt_id(); |
1267 set_monitor_chunks(NULL); | |
1268 set_next(NULL); | |
1269 set_thread_state(_thread_new); | |
1270 _terminated = _not_terminated; | |
1271 _privileged_stack_top = NULL; | |
1272 _array_for_gc = NULL; | |
1273 _suspend_equivalent = false; | |
1274 _in_deopt_handler = 0; | |
1275 _doing_unsafe_access = false; | |
1276 _stack_guard_state = stack_guard_unused; | |
1277 _exception_oop = NULL; | |
1278 _exception_pc = 0; | |
1279 _exception_handler_pc = 0; | |
1903 | 1280 _is_method_handle_return = 0; |
0 | 1281 _jvmti_thread_state= NULL; |
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1282 _should_post_on_exceptions_flag = JNI_FALSE; |
0 | 1283 _jvmti_get_loaded_classes_closure = NULL; |
1284 _interp_only_mode = 0; | |
1285 _special_runtime_exit_condition = _no_async_condition; | |
1286 _pending_async_exception = NULL; | |
1287 _is_compiling = false; | |
1288 _thread_stat = NULL; | |
1289 _thread_stat = new ThreadStatistics(); | |
1290 _blocked_on_compilation = false; | |
1291 _jni_active_critical = 0; | |
1292 _do_not_unlock_if_synchronized = false; | |
1293 _cached_monitor_info = NULL; | |
1294 _parker = Parker::Allocate(this) ; | |
1295 | |
1296 #ifndef PRODUCT | |
1297 _jmp_ring_index = 0; | |
1298 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
1299 record_jump(NULL, NULL, NULL, 0); | |
1300 } | |
1301 #endif /* PRODUCT */ | |
1302 | |
1303 set_thread_profiler(NULL); | |
1304 if (FlatProfiler::is_active()) { | |
1305 // This is where we would decide to either give each thread it's own profiler | |
1306 // or use one global one from FlatProfiler, | |
1307 // or up to some count of the number of profiled threads, etc. | |
1308 ThreadProfiler* pp = new ThreadProfiler(); | |
1309 pp->engage(); | |
1310 set_thread_profiler(pp); | |
1311 } | |
1312 | |
1313 // Setup safepoint state info for this thread | |
1314 ThreadSafepointState::create(this); | |
1315 | |
1316 debug_only(_java_call_counter = 0); | |
1317 | |
1318 // JVMTI PopFrame support | |
1319 _popframe_condition = popframe_inactive; | |
1320 _popframe_preserved_args = NULL; | |
1321 _popframe_preserved_args_size = 0; | |
1322 | |
1323 pd_initialize(); | |
1324 } | |
1325 | |
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1326 #ifndef SERIALGC |
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1327 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1328 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1329 #endif // !SERIALGC |
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1330 |
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1331 JavaThread::JavaThread(bool is_attaching) : |
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1332 Thread() |
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1333 #ifndef SERIALGC |
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1334 , _satb_mark_queue(&_satb_mark_queue_set), |
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1335 _dirty_card_queue(&_dirty_card_queue_set) |
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1336 #endif // !SERIALGC |
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1337 { |
0 | 1338 initialize(); |
1339 _is_attaching = is_attaching; | |
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1340 assert(_deferred_card_mark.is_empty(), "Default MemRegion ctor"); |
0 | 1341 } |
1342 | |
1343 bool JavaThread::reguard_stack(address cur_sp) { | |
1344 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
1345 return true; // Stack already guarded or guard pages not needed. | |
1346 } | |
1347 | |
1348 if (register_stack_overflow()) { | |
1349 // For those architectures which have separate register and | |
1350 // memory stacks, we must check the register stack to see if | |
1351 // it has overflowed. | |
1352 return false; | |
1353 } | |
1354 | |
1355 // Java code never executes within the yellow zone: the latter is only | |
1356 // there to provoke an exception during stack banging. If java code | |
1357 // is executing there, either StackShadowPages should be larger, or | |
1358 // some exception code in c1, c2 or the interpreter isn't unwinding | |
1359 // when it should. | |
1360 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
1361 | |
1362 enable_stack_yellow_zone(); | |
1363 return true; | |
1364 } | |
1365 | |
1366 bool JavaThread::reguard_stack(void) { | |
1367 return reguard_stack(os::current_stack_pointer()); | |
1368 } | |
1369 | |
1370 | |
1371 void JavaThread::block_if_vm_exited() { | |
1372 if (_terminated == _vm_exited) { | |
1373 // _vm_exited is set at safepoint, and Threads_lock is never released | |
1374 // we will block here forever | |
1375 Threads_lock->lock_without_safepoint_check(); | |
1376 ShouldNotReachHere(); | |
1377 } | |
1378 } | |
1379 | |
1380 | |
1381 // Remove this ifdef when C1 is ported to the compiler interface. | |
1382 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
1383 | |
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1384 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1385 Thread() |
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1386 #ifndef SERIALGC |
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1387 , _satb_mark_queue(&_satb_mark_queue_set), |
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1388 _dirty_card_queue(&_dirty_card_queue_set) |
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1389 #endif // !SERIALGC |
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1390 { |
0 | 1391 if (TraceThreadEvents) { |
1392 tty->print_cr("creating thread %p", this); | |
1393 } | |
1394 initialize(); | |
1395 _is_attaching = false; | |
1396 set_entry_point(entry_point); | |
1397 // Create the native thread itself. | |
1398 // %note runtime_23 | |
1399 os::ThreadType thr_type = os::java_thread; | |
1400 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
1401 os::java_thread; | |
1402 os::create_thread(this, thr_type, stack_sz); | |
1403 | |
1404 // The _osthread may be NULL here because we ran out of memory (too many threads active). | |
1405 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
1406 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
1407 // the exception consists of creating the exception object & initializing it, initialization | |
1408 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
1409 // | |
1410 // The thread is still suspended when we reach here. Thread must be explicit started | |
1411 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
1412 // by calling Threads:add. The reason why this is not done here, is because the thread | |
1413 // object must be fully initialized (take a look at JVM_Start) | |
1414 } | |
1415 | |
1416 JavaThread::~JavaThread() { | |
1417 if (TraceThreadEvents) { | |
1418 tty->print_cr("terminate thread %p", this); | |
1419 } | |
1420 | |
1421 // JSR166 -- return the parker to the free list | |
1422 Parker::Release(_parker); | |
1423 _parker = NULL ; | |
1424 | |
1425 // Free any remaining previous UnrollBlock | |
1426 vframeArray* old_array = vframe_array_last(); | |
1427 | |
1428 if (old_array != NULL) { | |
1429 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
1430 old_array->set_unroll_block(NULL); | |
1431 delete old_info; | |
1432 delete old_array; | |
1433 } | |
1434 | |
1435 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
1436 if (deferred != NULL) { | |
1437 // This can only happen if thread is destroyed before deoptimization occurs. | |
1438 assert(deferred->length() != 0, "empty array!"); | |
1439 do { | |
1440 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
1441 deferred->remove_at(0); | |
1442 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
1443 delete dlv; | |
1444 } while (deferred->length() != 0); | |
1445 delete deferred; | |
1446 } | |
1447 | |
1448 // All Java related clean up happens in exit | |
1449 ThreadSafepointState::destroy(this); | |
1450 if (_thread_profiler != NULL) delete _thread_profiler; | |
1451 if (_thread_stat != NULL) delete _thread_stat; | |
1452 } | |
1453 | |
1454 | |
1455 // The first routine called by a new Java thread | |
1456 void JavaThread::run() { | |
1457 // initialize thread-local alloc buffer related fields | |
1458 this->initialize_tlab(); | |
1459 | |
1460 // used to test validitity of stack trace backs | |
1461 this->record_base_of_stack_pointer(); | |
1462 | |
1463 // Record real stack base and size. | |
1464 this->record_stack_base_and_size(); | |
1465 | |
1466 // Initialize thread local storage; set before calling MutexLocker | |
1467 this->initialize_thread_local_storage(); | |
1468 | |
1469 this->create_stack_guard_pages(); | |
1470 | |
1681
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1471 this->cache_global_variables(); |
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1472 |
0 | 1473 // Thread is now sufficient initialized to be handled by the safepoint code as being |
1474 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
1475 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
1476 | |
1477 assert(JavaThread::current() == this, "sanity check"); | |
1478 assert(!Thread::current()->owns_locks(), "sanity check"); | |
1479 | |
1480 DTRACE_THREAD_PROBE(start, this); | |
1481 | |
1482 // This operation might block. We call that after all safepoint checks for a new thread has | |
1483 // been completed. | |
1484 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1485 | |
1486 if (JvmtiExport::should_post_thread_life()) { | |
1487 JvmtiExport::post_thread_start(this); | |
1488 } | |
1489 | |
1490 // We call another function to do the rest so we are sure that the stack addresses used | |
1491 // from there will be lower than the stack base just computed | |
1492 thread_main_inner(); | |
1493 | |
1494 // Note, thread is no longer valid at this point! | |
1495 } | |
1496 | |
1497 | |
1498 void JavaThread::thread_main_inner() { | |
1499 assert(JavaThread::current() == this, "sanity check"); | |
1500 assert(this->threadObj() != NULL, "just checking"); | |
1501 | |
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1502 // Execute thread entry point unless this thread has a pending exception |
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1503 // or has been stopped before starting. |
0 | 1504 // Note: Due to JVM_StopThread we can have pending exceptions already! |
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1505 if (!this->has_pending_exception() && |
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1506 !java_lang_Thread::is_stillborn(this->threadObj())) { |
0 | 1507 HandleMark hm(this); |
1508 this->entry_point()(this, this); | |
1509 } | |
1510 | |
1511 DTRACE_THREAD_PROBE(stop, this); | |
1512 | |
1513 this->exit(false); | |
1514 delete this; | |
1515 } | |
1516 | |
1517 | |
1518 static void ensure_join(JavaThread* thread) { | |
1519 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
1520 Handle threadObj(thread, thread->threadObj()); | |
1521 assert(threadObj.not_null(), "java thread object must exist"); | |
1522 ObjectLocker lock(threadObj, thread); | |
1523 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1524 thread->clear_pending_exception(); | |
1525 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
1526 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
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1527 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1528 // to complete once we've done the notify_all below |
0 | 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, |
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1579 vmSymbols::dispatchUncaughtException_name(), |
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1580 vmSymbols::throwable_void_signature(), |
0 | 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, | |
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1588 vmSymbols::dispatchUncaughtException_name(), |
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1589 vmSymbols::throwable_void_signature(), |
0 | 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, | |
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1597 vmSymbols::uncaughtException_name(), |
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1598 vmSymbols::thread_throwable_void_signature(), |
0 | 1599 threadObj, // Arg 1 |
1600 uncaught_exception, // Arg 2 | |
1601 THREAD); | |
1602 } | |
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1603 if (HAS_PENDING_EXCEPTION) { |
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1604 ResourceMark rm(this); |
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1605 jio_fprintf(defaultStream::error_stream(), |
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1606 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1607 " in thread \"%s\"\n", |
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1608 Klass::cast(pending_exception()->klass())->external_name(), |
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1609 get_thread_name()); |
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1610 CLEAR_PENDING_EXCEPTION; |
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1611 } |
0 | 1612 } |
1613 } | |
1614 | |
1615 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during | |
1616 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
1617 // is deprecated anyhow. | |
1618 { int count = 3; | |
1619 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
1620 EXCEPTION_MARK; | |
1621 JavaValue result(T_VOID); | |
1142 | 1622 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1623 JavaCalls::call_virtual(&result, |
1624 threadObj, thread_klass, | |
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1625 vmSymbols::exit_method_name(), |
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1626 vmSymbols::void_method_signature(), |
0 | 1627 THREAD); |
1628 CLEAR_PENDING_EXCEPTION; | |
1629 } | |
1630 } | |
1631 | |
1632 // notify JVMTI | |
1633 if (JvmtiExport::should_post_thread_life()) { | |
1634 JvmtiExport::post_thread_end(this); | |
1635 } | |
1636 | |
1637 // We have notified the agents that we are exiting, before we go on, | |
1638 // we must check for a pending external suspend request and honor it | |
1639 // in order to not surprise the thread that made the suspend request. | |
1640 while (true) { | |
1641 { | |
1642 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1643 if (!is_external_suspend()) { | |
1644 set_terminated(_thread_exiting); | |
1645 ThreadService::current_thread_exiting(this); | |
1646 break; | |
1647 } | |
1648 // Implied else: | |
1649 // Things get a little tricky here. We have a pending external | |
1650 // suspend request, but we are holding the SR_lock so we | |
1651 // can't just self-suspend. So we temporarily drop the lock | |
1652 // and then self-suspend. | |
1653 } | |
1654 | |
1655 ThreadBlockInVM tbivm(this); | |
1656 java_suspend_self(); | |
1657 | |
1658 // We're done with this suspend request, but we have to loop around | |
1659 // and check again. Eventually we will get SR_lock without a pending | |
1660 // external suspend request and will be able to mark ourselves as | |
1661 // exiting. | |
1662 } | |
1663 // no more external suspends are allowed at this point | |
1664 } else { | |
1665 // before_exit() has already posted JVMTI THREAD_END events | |
1666 } | |
1667 | |
1668 // Notify waiters on thread object. This has to be done after exit() is called | |
1669 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
1670 // group should have the destroyed bit set before waiters are notified). | |
1671 ensure_join(this); | |
1672 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
1673 | |
1674 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
1675 // held by this thread must be released. A detach operation must only | |
1676 // get here if there are no Java frames on the stack. Therefore, any | |
1677 // owned monitors at this point MUST be JNI-acquired monitors which are | |
1678 // pre-inflated and in the monitor cache. | |
1679 // | |
1680 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
1681 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
1682 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
1683 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
1684 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
1685 } | |
1686 | |
1687 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
1688 // is in a consistent state, in case GC happens | |
1689 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
1690 | |
1691 if (active_handles() != NULL) { | |
1692 JNIHandleBlock* block = active_handles(); | |
1693 set_active_handles(NULL); | |
1694 JNIHandleBlock::release_block(block); | |
1695 } | |
1696 | |
1697 if (free_handle_block() != NULL) { | |
1698 JNIHandleBlock* block = free_handle_block(); | |
1699 set_free_handle_block(NULL); | |
1700 JNIHandleBlock::release_block(block); | |
1701 } | |
1702 | |
1703 // These have to be removed while this is still a valid thread. | |
1704 remove_stack_guard_pages(); | |
1705 | |
1706 if (UseTLAB) { | |
1707 tlab().make_parsable(true); // retire TLAB | |
1708 } | |
1709 | |
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1710 if (JvmtiEnv::environments_might_exist()) { |
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1711 JvmtiExport::cleanup_thread(this); |
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1712 } |
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1713 |
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1714 #ifndef SERIALGC |
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1715 // We must flush G1-related buffers before removing a thread from |
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1716 // the list of active threads. |
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1717 if (UseG1GC) { |
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1718 flush_barrier_queues(); |
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1719 } |
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1720 #endif |
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1721 |
0 | 1722 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
1723 Threads::remove(this); | |
1724 } | |
1725 | |
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1726 #ifndef SERIALGC |
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1727 // Flush G1-related queues. |
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1728 void JavaThread::flush_barrier_queues() { |
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1729 satb_mark_queue().flush(); |
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1730 dirty_card_queue().flush(); |
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1731 } |
1842
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1732 |
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1733 void JavaThread::initialize_queues() { |
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1734 assert(!SafepointSynchronize::is_at_safepoint(), |
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1735 "we should not be at a safepoint"); |
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1736 |
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1737 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1738 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1739 // The SATB queue should have been constructed with its active |
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1740 // field set to false. |
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1741 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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1742 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1743 // If we are creating the thread during a marking cycle, we should |
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1744 // set the active field of the SATB queue to true. |
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1745 if (satb_queue_set.is_active()) { |
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1746 satb_queue.set_active(true); |
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1747 } |
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1748 |
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1749 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1750 // The dirty card queue should have been constructed with its |
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1751 // active field set to true. |
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1752 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1753 } |
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1754 #endif // !SERIALGC |
441
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1755 |
0 | 1756 void JavaThread::cleanup_failed_attach_current_thread() { |
441
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1757 if (get_thread_profiler() != NULL) { |
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1758 get_thread_profiler()->disengage(); |
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1759 ResourceMark rm; |
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1760 get_thread_profiler()->print(get_thread_name()); |
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1761 } |
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1762 |
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1763 if (active_handles() != NULL) { |
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1764 JNIHandleBlock* block = active_handles(); |
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1765 set_active_handles(NULL); |
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1766 JNIHandleBlock::release_block(block); |
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1767 } |
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1768 |
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1769 if (free_handle_block() != NULL) { |
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1770 JNIHandleBlock* block = free_handle_block(); |
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1771 set_free_handle_block(NULL); |
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1772 JNIHandleBlock::release_block(block); |
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1773 } |
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1774 |
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1775 // These have to be removed while this is still a valid thread. |
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1776 remove_stack_guard_pages(); |
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1777 |
441
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1778 if (UseTLAB) { |
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1779 tlab().make_parsable(true); // retire TLAB, if any |
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1780 } |
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1781 |
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1782 #ifndef SERIALGC |
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1783 if (UseG1GC) { |
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1784 flush_barrier_queues(); |
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1785 } |
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1786 #endif |
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1787 |
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1788 Threads::remove(this); |
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1789 delete this; |
0 | 1790 } |
1791 | |
1792 | |
441
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1793 |
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1794 |
0 | 1795 JavaThread* JavaThread::active() { |
1796 Thread* thread = ThreadLocalStorage::thread(); | |
1797 assert(thread != NULL, "just checking"); | |
1798 if (thread->is_Java_thread()) { | |
1799 return (JavaThread*) thread; | |
1800 } else { | |
1801 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
1802 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
1803 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
1804 assert(ret->is_Java_thread(), "must be a Java thread"); | |
1805 return ret; | |
1806 } | |
1807 } | |
1808 | |
1809 bool JavaThread::is_lock_owned(address adr) const { | |
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1810 if (Thread::is_lock_owned(adr)) return true; |
0 | 1811 |
1812 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
1813 if (chunk->contains(adr)) return true; | |
1814 } | |
1815 | |
1816 return false; | |
1817 } | |
1818 | |
1819 | |
1820 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
1821 chunk->set_next(monitor_chunks()); | |
1822 set_monitor_chunks(chunk); | |
1823 } | |
1824 | |
1825 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
1826 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
1827 if (monitor_chunks() == chunk) { | |
1828 set_monitor_chunks(chunk->next()); | |
1829 } else { | |
1830 MonitorChunk* prev = monitor_chunks(); | |
1831 while (prev->next() != chunk) prev = prev->next(); | |
1832 prev->set_next(chunk->next()); | |
1833 } | |
1834 } | |
1835 | |
1836 // JVM support. | |
1837 | |
1838 // Note: this function shouldn't block if it's called in | |
1839 // _thread_in_native_trans state (such as from | |
1840 // check_special_condition_for_native_trans()). | |
1841 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
1842 | |
1843 if (has_last_Java_frame() && has_async_condition()) { | |
1844 // If we are at a polling page safepoint (not a poll return) | |
1845 // then we must defer async exception because live registers | |
1846 // will be clobbered by the exception path. Poll return is | |
1847 // ok because the call we a returning from already collides | |
1848 // with exception handling registers and so there is no issue. | |
1849 // (The exception handling path kills call result registers but | |
1850 // this is ok since the exception kills the result anyway). | |
1851 | |
1852 if (is_at_poll_safepoint()) { | |
1853 // if the code we are returning to has deoptimized we must defer | |
1854 // the exception otherwise live registers get clobbered on the | |
1855 // exception path before deoptimization is able to retrieve them. | |
1856 // | |
1857 RegisterMap map(this, false); | |
1858 frame caller_fr = last_frame().sender(&map); | |
1859 assert(caller_fr.is_compiled_frame(), "what?"); | |
1860 if (caller_fr.is_deoptimized_frame()) { | |
1861 if (TraceExceptions) { | |
1862 ResourceMark rm; | |
1863 tty->print_cr("deferred async exception at compiled safepoint"); | |
1864 } | |
1865 return; | |
1866 } | |
1867 } | |
1868 } | |
1869 | |
1870 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
1871 if (condition == _no_async_condition) { | |
1872 // Conditions have changed since has_special_runtime_exit_condition() | |
1873 // was called: | |
1874 // - if we were here only because of an external suspend request, | |
1875 // then that was taken care of above (or cancelled) so we are done | |
1876 // - if we were here because of another async request, then it has | |
1877 // been cleared between the has_special_runtime_exit_condition() | |
1878 // and now so again we are done | |
1879 return; | |
1880 } | |
1881 | |
1882 // Check for pending async. exception | |
1883 if (_pending_async_exception != NULL) { | |
1884 // Only overwrite an already pending exception, if it is not a threadDeath. | |
1142 | 1885 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 1886 |
1887 // We cannot call Exceptions::_throw(...) here because we cannot block | |
1888 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
1889 | |
1890 if (TraceExceptions) { | |
1891 ResourceMark rm; | |
1892 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
1893 if (has_last_Java_frame() ) { | |
1894 frame f = last_frame(); | |
1895 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
1896 } | |
1897 tty->print_cr(" of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
1898 } | |
1899 _pending_async_exception = NULL; | |
1900 clear_has_async_exception(); | |
1901 } | |
1902 } | |
1903 | |
1904 if (check_unsafe_error && | |
1905 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
1906 condition = _no_async_condition; // done | |
1907 switch (thread_state()) { | |
1908 case _thread_in_vm: | |
1909 { | |
1910 JavaThread* THREAD = this; | |
1911 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
1912 } | |
1913 case _thread_in_native: | |
1914 { | |
1915 ThreadInVMfromNative tiv(this); | |
1916 JavaThread* THREAD = this; | |
1917 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
1918 } | |
1919 case _thread_in_Java: | |
1920 { | |
1921 ThreadInVMfromJava tiv(this); | |
1922 JavaThread* THREAD = this; | |
1923 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
1924 } | |
1925 default: | |
1926 ShouldNotReachHere(); | |
1927 } | |
1928 } | |
1929 | |
1930 assert(condition == _no_async_condition || has_pending_exception() || | |
1931 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
1932 "must have handled the async condition, if no exception"); | |
1933 } | |
1934 | |
1935 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
1936 // | |
1937 // Check for pending external suspend. Internal suspend requests do | |
1938 // not use handle_special_runtime_exit_condition(). | |
1939 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
1940 // thread is not the current thread. In older versions of jdbx, jdbx | |
1941 // threads could call into the VM with another thread's JNIEnv so we | |
1942 // can be here operating on behalf of a suspended thread (4432884). | |
1943 bool do_self_suspend = is_external_suspend_with_lock(); | |
1944 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
1945 // | |
1946 // Because thread is external suspended the safepoint code will count | |
1947 // thread as at a safepoint. This can be odd because we can be here | |
1948 // as _thread_in_Java which would normally transition to _thread_blocked | |
1949 // at a safepoint. We would like to mark the thread as _thread_blocked | |
1950 // before calling java_suspend_self like all other callers of it but | |
1951 // we must then observe proper safepoint protocol. (We can't leave | |
1952 // _thread_blocked with a safepoint in progress). However we can be | |
1953 // here as _thread_in_native_trans so we can't use a normal transition | |
1954 // constructor/destructor pair because they assert on that type of | |
1955 // transition. We could do something like: | |
1956 // | |
1957 // JavaThreadState state = thread_state(); | |
1958 // set_thread_state(_thread_in_vm); | |
1959 // { | |
1960 // ThreadBlockInVM tbivm(this); | |
1961 // java_suspend_self() | |
1962 // } | |
1963 // set_thread_state(_thread_in_vm_trans); | |
1964 // if (safepoint) block; | |
1965 // set_thread_state(state); | |
1966 // | |
1967 // but that is pretty messy. Instead we just go with the way the | |
1968 // code has worked before and note that this is the only path to | |
1969 // java_suspend_self that doesn't put the thread in _thread_blocked | |
1970 // mode. | |
1971 | |
1972 frame_anchor()->make_walkable(this); | |
1973 java_suspend_self(); | |
1974 | |
1975 // We might be here for reasons in addition to the self-suspend request | |
1976 // so check for other async requests. | |
1977 } | |
1978 | |
1979 if (check_asyncs) { | |
1980 check_and_handle_async_exceptions(); | |
1981 } | |
1982 } | |
1983 | |
1984 void JavaThread::send_thread_stop(oop java_throwable) { | |
1985 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
1986 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
1987 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
1988 | |
1989 // Do not throw asynchronous exceptions against the compiler thread | |
1990 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
1991 if (is_Compiler_thread()) return; | |
1992 | |
1993 { | |
1994 // Actually throw the Throwable against the target Thread - however | |
1995 // only if there is no thread death exception installed already. | |
1142 | 1996 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 1997 // If the topmost frame is a runtime stub, then we are calling into |
1998 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
1999 // must deoptimize the caller before continuing, as the compiled exception handler table | |
2000 // may not be valid | |
2001 if (has_last_Java_frame()) { | |
2002 frame f = last_frame(); | |
2003 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
2004 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2005 RegisterMap reg_map(this, UseBiasedLocking); | |
2006 frame compiled_frame = f.sender(®_map); | |
2007 if (compiled_frame.can_be_deoptimized()) { | |
2008 Deoptimization::deoptimize(this, compiled_frame, ®_map); | |
2009 } | |
2010 } | |
2011 } | |
2012 | |
2013 // Set async. pending exception in thread. | |
2014 set_pending_async_exception(java_throwable); | |
2015 | |
2016 if (TraceExceptions) { | |
2017 ResourceMark rm; | |
2018 tty->print_cr("Pending Async. exception installed of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
2019 } | |
2020 // for AbortVMOnException flag | |
2021 NOT_PRODUCT(Exceptions::debug_check_abort(instanceKlass::cast(_pending_async_exception->klass())->external_name())); | |
2022 } | |
2023 } | |
2024 | |
2025 | |
2026 // Interrupt thread so it will wake up from a potential wait() | |
2027 Thread::interrupt(this); | |
2028 } | |
2029 | |
2030 // External suspension mechanism. | |
2031 // | |
2032 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
2033 // to any VM_locks and it is at a transition | |
2034 // Self-suspension will happen on the transition out of the vm. | |
2035 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
2036 // | |
2037 // Guarantees on return: | |
2038 // + Target thread will not execute any new bytecode (that's why we need to | |
2039 // force a safepoint) | |
2040 // + Target thread will not enter any new monitors | |
2041 // | |
2042 void JavaThread::java_suspend() { | |
2043 { MutexLocker mu(Threads_lock); | |
2044 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
2045 return; | |
2046 } | |
2047 } | |
2048 | |
2049 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2050 if (!is_external_suspend()) { | |
2051 // a racing resume has cancelled us; bail out now | |
2052 return; | |
2053 } | |
2054 | |
2055 // suspend is done | |
2056 uint32_t debug_bits = 0; | |
2057 // Warning: is_ext_suspend_completed() may temporarily drop the | |
2058 // SR_lock to allow the thread to reach a stable thread state if | |
2059 // it is currently in a transient thread state. | |
2060 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
2061 SuspendRetryDelay, &debug_bits) ) { | |
2062 return; | |
2063 } | |
2064 } | |
2065 | |
2066 VM_ForceSafepoint vm_suspend; | |
2067 VMThread::execute(&vm_suspend); | |
2068 } | |
2069 | |
2070 // Part II of external suspension. | |
2071 // A JavaThread self suspends when it detects a pending external suspend | |
2072 // request. This is usually on transitions. It is also done in places | |
2073 // where continuing to the next transition would surprise the caller, | |
2074 // e.g., monitor entry. | |
2075 // | |
2076 // Returns the number of times that the thread self-suspended. | |
2077 // | |
2078 // Note: DO NOT call java_suspend_self() when you just want to block current | |
2079 // thread. java_suspend_self() is the second stage of cooperative | |
2080 // suspension for external suspend requests and should only be used | |
2081 // to complete an external suspend request. | |
2082 // | |
2083 int JavaThread::java_suspend_self() { | |
2084 int ret = 0; | |
2085 | |
2086 // we are in the process of exiting so don't suspend | |
2087 if (is_exiting()) { | |
2088 clear_external_suspend(); | |
2089 return ret; | |
2090 } | |
2091 | |
2092 assert(_anchor.walkable() || | |
2093 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
2094 "must have walkable stack"); | |
2095 | |
2096 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2097 | |
979 | 2098 assert(!this->is_ext_suspended(), |
0 | 2099 "a thread trying to self-suspend should not already be suspended"); |
2100 | |
2101 if (this->is_suspend_equivalent()) { | |
2102 // If we are self-suspending as a result of the lifting of a | |
2103 // suspend equivalent condition, then the suspend_equivalent | |
2104 // flag is not cleared until we set the ext_suspended flag so | |
2105 // that wait_for_ext_suspend_completion() returns consistent | |
2106 // results. | |
2107 this->clear_suspend_equivalent(); | |
2108 } | |
2109 | |
2110 // A racing resume may have cancelled us before we grabbed SR_lock | |
2111 // above. Or another external suspend request could be waiting for us | |
2112 // by the time we return from SR_lock()->wait(). The thread | |
2113 // that requested the suspension may already be trying to walk our | |
2114 // stack and if we return now, we can change the stack out from under | |
2115 // it. This would be a "bad thing (TM)" and cause the stack walker | |
2116 // to crash. We stay self-suspended until there are no more pending | |
2117 // external suspend requests. | |
2118 while (is_external_suspend()) { | |
2119 ret++; | |
2120 this->set_ext_suspended(); | |
2121 | |
2122 // _ext_suspended flag is cleared by java_resume() | |
2123 while (is_ext_suspended()) { | |
2124 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
2125 } | |
2126 } | |
2127 | |
2128 return ret; | |
2129 } | |
2130 | |
2131 #ifdef ASSERT | |
2132 // verify the JavaThread has not yet been published in the Threads::list, and | |
2133 // hence doesn't need protection from concurrent access at this stage | |
2134 void JavaThread::verify_not_published() { | |
2135 if (!Threads_lock->owned_by_self()) { | |
2136 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
2137 assert( !Threads::includes(this), | |
2138 "java thread shouldn't have been published yet!"); | |
2139 } | |
2140 else { | |
2141 assert( !Threads::includes(this), | |
2142 "java thread shouldn't have been published yet!"); | |
2143 } | |
2144 } | |
2145 #endif | |
2146 | |
2147 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2148 // progress or when _suspend_flags is non-zero. | |
2149 // Current thread needs to self-suspend if there is a suspend request and/or | |
2150 // block if a safepoint is in progress. | |
2151 // Async exception ISN'T checked. | |
2152 // Note only the ThreadInVMfromNative transition can call this function | |
2153 // directly and when thread state is _thread_in_native_trans | |
2154 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
2155 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
2156 | |
2157 JavaThread *curJT = JavaThread::current(); | |
2158 bool do_self_suspend = thread->is_external_suspend(); | |
2159 | |
2160 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
2161 | |
2162 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2163 // thread is not the current thread. In older versions of jdbx, jdbx | |
2164 // threads could call into the VM with another thread's JNIEnv so we | |
2165 // can be here operating on behalf of a suspended thread (4432884). | |
2166 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
2167 JavaThreadState state = thread->thread_state(); | |
2168 | |
2169 // We mark this thread_blocked state as a suspend-equivalent so | |
2170 // that a caller to is_ext_suspend_completed() won't be confused. | |
2171 // The suspend-equivalent state is cleared by java_suspend_self(). | |
2172 thread->set_suspend_equivalent(); | |
2173 | |
2174 // If the safepoint code sees the _thread_in_native_trans state, it will | |
2175 // wait until the thread changes to other thread state. There is no | |
2176 // guarantee on how soon we can obtain the SR_lock and complete the | |
2177 // self-suspend request. It would be a bad idea to let safepoint wait for | |
2178 // too long. Temporarily change the state to _thread_blocked to | |
2179 // let the VM thread know that this thread is ready for GC. The problem | |
2180 // of changing thread state is that safepoint could happen just after | |
2181 // java_suspend_self() returns after being resumed, and VM thread will | |
2182 // see the _thread_blocked state. We must check for safepoint | |
2183 // after restoring the state and make sure we won't leave while a safepoint | |
2184 // is in progress. | |
2185 thread->set_thread_state(_thread_blocked); | |
2186 thread->java_suspend_self(); | |
2187 thread->set_thread_state(state); | |
2188 // Make sure new state is seen by VM thread | |
2189 if (os::is_MP()) { | |
2190 if (UseMembar) { | |
2191 // Force a fence between the write above and read below | |
2192 OrderAccess::fence(); | |
2193 } else { | |
2194 // Must use this rather than serialization page in particular on Windows | |
2195 InterfaceSupport::serialize_memory(thread); | |
2196 } | |
2197 } | |
2198 } | |
2199 | |
2200 if (SafepointSynchronize::do_call_back()) { | |
2201 // If we are safepointing, then block the caller which may not be | |
2202 // the same as the target thread (see above). | |
2203 SafepointSynchronize::block(curJT); | |
2204 } | |
2205 | |
2206 if (thread->is_deopt_suspend()) { | |
2207 thread->clear_deopt_suspend(); | |
2208 RegisterMap map(thread, false); | |
2209 frame f = thread->last_frame(); | |
2210 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
2211 f = f.sender(&map); | |
2212 } | |
2213 if (f.id() == thread->must_deopt_id()) { | |
2214 thread->clear_must_deopt_id(); | |
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2215 f.deoptimize(thread); |
0 | 2216 } else { |
2217 fatal("missed deoptimization!"); | |
2218 } | |
2219 } | |
2220 } | |
2221 | |
2222 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2223 // progress or when _suspend_flags is non-zero. | |
2224 // Current thread needs to self-suspend if there is a suspend request and/or | |
2225 // block if a safepoint is in progress. | |
2226 // Also check for pending async exception (not including unsafe access error). | |
2227 // Note only the native==>VM/Java barriers can call this function and when | |
2228 // thread state is _thread_in_native_trans. | |
2229 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
2230 check_safepoint_and_suspend_for_native_trans(thread); | |
2231 | |
2232 if (thread->has_async_exception()) { | |
2233 // We are in _thread_in_native_trans state, don't handle unsafe | |
2234 // access error since that may block. | |
2235 thread->check_and_handle_async_exceptions(false); | |
2236 } | |
2237 } | |
2238 | |
2239 // We need to guarantee the Threads_lock here, since resumes are not | |
2240 // allowed during safepoint synchronization | |
2241 // Can only resume from an external suspension | |
2242 void JavaThread::java_resume() { | |
2243 assert_locked_or_safepoint(Threads_lock); | |
2244 | |
2245 // Sanity check: thread is gone, has started exiting or the thread | |
2246 // was not externally suspended. | |
2247 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
2248 return; | |
2249 } | |
2250 | |
2251 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2252 | |
2253 clear_external_suspend(); | |
2254 | |
2255 if (is_ext_suspended()) { | |
2256 clear_ext_suspended(); | |
2257 SR_lock()->notify_all(); | |
2258 } | |
2259 } | |
2260 | |
2261 void JavaThread::create_stack_guard_pages() { | |
2262 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
2263 address low_addr = stack_base() - stack_size(); | |
2264 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2265 | |
2266 int allocate = os::allocate_stack_guard_pages(); | |
2267 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
2268 | |
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2269 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
0 | 2270 warning("Attempt to allocate stack guard pages failed."); |
2271 return; | |
2272 } | |
2273 | |
2274 if (os::guard_memory((char *) low_addr, len)) { | |
2275 _stack_guard_state = stack_guard_enabled; | |
2276 } else { | |
2277 warning("Attempt to protect stack guard pages failed."); | |
2278 if (os::uncommit_memory((char *) low_addr, len)) { | |
2279 warning("Attempt to deallocate stack guard pages failed."); | |
2280 } | |
2281 } | |
2282 } | |
2283 | |
2284 void JavaThread::remove_stack_guard_pages() { | |
2285 if (_stack_guard_state == stack_guard_unused) return; | |
2286 address low_addr = stack_base() - stack_size(); | |
2287 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2288 | |
2289 if (os::allocate_stack_guard_pages()) { | |
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2290 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
0 | 2291 _stack_guard_state = stack_guard_unused; |
2292 } else { | |
2293 warning("Attempt to deallocate stack guard pages failed."); | |
2294 } | |
2295 } else { | |
2296 if (_stack_guard_state == stack_guard_unused) return; | |
2297 if (os::unguard_memory((char *) low_addr, len)) { | |
2298 _stack_guard_state = stack_guard_unused; | |
2299 } else { | |
2300 warning("Attempt to unprotect stack guard pages failed."); | |
2301 } | |
2302 } | |
2303 } | |
2304 | |
2305 void JavaThread::enable_stack_yellow_zone() { | |
2306 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2307 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
2308 | |
2309 // The base notation is from the stacks point of view, growing downward. | |
2310 // We need to adjust it to work correctly with guard_memory() | |
2311 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2312 | |
2313 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
2314 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
2315 | |
2316 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
2317 _stack_guard_state = stack_guard_enabled; | |
2318 } else { | |
2319 warning("Attempt to guard stack yellow zone failed."); | |
2320 } | |
2321 enable_register_stack_guard(); | |
2322 } | |
2323 | |
2324 void JavaThread::disable_stack_yellow_zone() { | |
2325 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2326 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
2327 | |
2328 // Simply return if called for a thread that does not use guard pages. | |
2329 if (_stack_guard_state == stack_guard_unused) return; | |
2330 | |
2331 // The base notation is from the stacks point of view, growing downward. | |
2332 // We need to adjust it to work correctly with guard_memory() | |
2333 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2334 | |
2335 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
2336 _stack_guard_state = stack_guard_yellow_disabled; | |
2337 } else { | |
2338 warning("Attempt to unguard stack yellow zone failed."); | |
2339 } | |
2340 disable_register_stack_guard(); | |
2341 } | |
2342 | |
2343 void JavaThread::enable_stack_red_zone() { | |
2344 // The base notation is from the stacks point of view, growing downward. | |
2345 // We need to adjust it to work correctly with guard_memory() | |
2346 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2347 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2348 | |
2349 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
2350 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
2351 | |
2352 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
2353 warning("Attempt to guard stack red zone failed."); | |
2354 } | |
2355 } | |
2356 | |
2357 void JavaThread::disable_stack_red_zone() { | |
2358 // The base notation is from the stacks point of view, growing downward. | |
2359 // We need to adjust it to work correctly with guard_memory() | |
2360 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2361 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2362 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
2363 warning("Attempt to unguard stack red zone failed."); | |
2364 } | |
2365 } | |
2366 | |
2367 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
2368 // ignore is there is no stack | |
2369 if (!has_last_Java_frame()) return; | |
2370 // traverse the stack frames. Starts from top frame. | |
2371 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2372 frame* fr = fst.current(); | |
2373 f(fr, fst.register_map()); | |
2374 } | |
2375 } | |
2376 | |
2377 | |
2378 #ifndef PRODUCT | |
2379 // Deoptimization | |
2380 // Function for testing deoptimization | |
2381 void JavaThread::deoptimize() { | |
2382 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2383 StackFrameStream fst(this, UseBiasedLocking); | |
2384 bool deopt = false; // Dump stack only if a deopt actually happens. | |
2385 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
2386 // Iterate over all frames in the thread and deoptimize | |
2387 for(; !fst.is_done(); fst.next()) { | |
2388 if(fst.current()->can_be_deoptimized()) { | |
2389 | |
2390 if (only_at) { | |
2391 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
2392 // consists of comma or carriage return separated numbers so | |
2393 // search for the current bci in that string. | |
2394 address pc = fst.current()->pc(); | |
2395 nmethod* nm = (nmethod*) fst.current()->cb(); | |
2396 ScopeDesc* sd = nm->scope_desc_at( pc); | |
2397 char buffer[8]; | |
2398 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
2399 size_t len = strlen(buffer); | |
2400 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
2401 while (found != NULL) { | |
2402 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
2403 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
2404 // Check that the bci found is bracketed by terminators. | |
2405 break; | |
2406 } | |
2407 found = strstr(found + 1, buffer); | |
2408 } | |
2409 if (!found) { | |
2410 continue; | |
2411 } | |
2412 } | |
2413 | |
2414 if (DebugDeoptimization && !deopt) { | |
2415 deopt = true; // One-time only print before deopt | |
2416 tty->print_cr("[BEFORE Deoptimization]"); | |
2417 trace_frames(); | |
2418 trace_stack(); | |
2419 } | |
2420 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2421 } | |
2422 } | |
2423 | |
2424 if (DebugDeoptimization && deopt) { | |
2425 tty->print_cr("[AFTER Deoptimization]"); | |
2426 trace_frames(); | |
2427 } | |
2428 } | |
2429 | |
2430 | |
2431 // Make zombies | |
2432 void JavaThread::make_zombies() { | |
2433 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2434 if (fst.current()->can_be_deoptimized()) { | |
2435 // it is a Java nmethod | |
2436 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
2437 nm->make_not_entrant(); | |
2438 } | |
2439 } | |
2440 } | |
2441 #endif // PRODUCT | |
2442 | |
2443 | |
2444 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
2445 if (!has_last_Java_frame()) return; | |
2446 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2447 StackFrameStream fst(this, UseBiasedLocking); | |
2448 for(; !fst.is_done(); fst.next()) { | |
2449 if (fst.current()->should_be_deoptimized()) { | |
2450 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2451 } | |
2452 } | |
2453 } | |
2454 | |
2455 | |
2456 // GC support | |
2457 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
2458 | |
2459 void JavaThread::gc_epilogue() { | |
2460 frames_do(frame_gc_epilogue); | |
2461 } | |
2462 | |
2463 | |
2464 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
2465 | |
2466 void JavaThread::gc_prologue() { | |
2467 frames_do(frame_gc_prologue); | |
2468 } | |
2469 | |
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2470 // If the caller is a NamedThread, then remember, in the current scope, |
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2471 // the given JavaThread in its _processed_thread field. |
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2472 class RememberProcessedThread: public StackObj { |
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2473 NamedThread* _cur_thr; |
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2474 public: |
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2475 RememberProcessedThread(JavaThread* jthr) { |
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2476 Thread* thread = Thread::current(); |
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2477 if (thread->is_Named_thread()) { |
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2478 _cur_thr = (NamedThread *)thread; |
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2479 _cur_thr->set_processed_thread(jthr); |
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2480 } else { |
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2481 _cur_thr = NULL; |
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2482 } |
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2483 } |
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2484 |
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2485 ~RememberProcessedThread() { |
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2486 if (_cur_thr) { |
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2487 _cur_thr->set_processed_thread(NULL); |
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2488 } |
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2489 } |
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2490 }; |
0 | 2491 |
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2492 void JavaThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
1166 | 2493 // Verify that the deferred card marks have been flushed. |
2494 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
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2495 |
0 | 2496 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
2497 // since there may be more than one thread using each ThreadProfiler. | |
2498 | |
2499 // Traverse the GCHandles | |
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2500 Thread::oops_do(f, cf); |
0 | 2501 |
2502 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2503 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2504 | |
2505 if (has_last_Java_frame()) { | |
1119
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2506 // Record JavaThread to GC thread |
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|
2507 RememberProcessedThread rpt(this); |
0 | 2508 |
2509 // Traverse the privileged stack | |
2510 if (_privileged_stack_top != NULL) { | |
2511 _privileged_stack_top->oops_do(f); | |
2512 } | |
2513 | |
2514 // traverse the registered growable array | |
2515 if (_array_for_gc != NULL) { | |
2516 for (int index = 0; index < _array_for_gc->length(); index++) { | |
2517 f->do_oop(_array_for_gc->adr_at(index)); | |
2518 } | |
2519 } | |
2520 | |
2521 // Traverse the monitor chunks | |
2522 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
2523 chunk->oops_do(f); | |
2524 } | |
2525 | |
2526 // Traverse the execution stack | |
2527 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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|
2528 fst.current()->oops_do(f, cf, fst.register_map()); |
0 | 2529 } |
2530 } | |
2531 | |
2532 // callee_target is never live across a gc point so NULL it here should | |
2533 // it still contain a methdOop. | |
2534 | |
2535 set_callee_target(NULL); | |
2536 | |
2537 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
2538 // If we have deferred set_locals there might be oops waiting to be | |
2539 // written | |
2540 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
2541 if (list != NULL) { | |
2542 for (int i = 0; i < list->length(); i++) { | |
2543 list->at(i)->oops_do(f); | |
2544 } | |
2545 } | |
2546 | |
2547 // Traverse instance variables at the end since the GC may be moving things | |
2548 // around using this function | |
2549 f->do_oop((oop*) &_threadObj); | |
2550 f->do_oop((oop*) &_vm_result); | |
2551 f->do_oop((oop*) &_vm_result_2); | |
2552 f->do_oop((oop*) &_exception_oop); | |
2553 f->do_oop((oop*) &_pending_async_exception); | |
2554 | |
2555 if (jvmti_thread_state() != NULL) { | |
2556 jvmti_thread_state()->oops_do(f); | |
2557 } | |
2558 } | |
2559 | |
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2560 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
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|
2561 Thread::nmethods_do(cf); // (super method is a no-op) |
0 | 2562 |
2563 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2564 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2565 | |
2566 if (has_last_Java_frame()) { | |
2567 // Traverse the execution stack | |
2568 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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|
2569 fst.current()->nmethods_do(cf); |
0 | 2570 } |
2571 } | |
2572 } | |
2573 | |
2574 // Printing | |
2575 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
2576 switch (_thread_state) { | |
2577 case _thread_uninitialized: return "_thread_uninitialized"; | |
2578 case _thread_new: return "_thread_new"; | |
2579 case _thread_new_trans: return "_thread_new_trans"; | |
2580 case _thread_in_native: return "_thread_in_native"; | |
2581 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
2582 case _thread_in_vm: return "_thread_in_vm"; | |
2583 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
2584 case _thread_in_Java: return "_thread_in_Java"; | |
2585 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
2586 case _thread_blocked: return "_thread_blocked"; | |
2587 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
2588 default: return "unknown thread state"; | |
2589 } | |
2590 } | |
2591 | |
2592 #ifndef PRODUCT | |
2593 void JavaThread::print_thread_state_on(outputStream *st) const { | |
2594 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
2595 }; | |
2596 void JavaThread::print_thread_state() const { | |
2597 print_thread_state_on(tty); | |
2598 }; | |
2599 #endif // PRODUCT | |
2600 | |
2601 // Called by Threads::print() for VM_PrintThreads operation | |
2602 void JavaThread::print_on(outputStream *st) const { | |
2603 st->print("\"%s\" ", get_thread_name()); | |
2604 oop thread_oop = threadObj(); | |
2605 if (thread_oop != NULL && java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
2606 Thread::print_on(st); | |
2607 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
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|
2608 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
0 | 2609 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
2610 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
2611 } | |
2612 #ifndef PRODUCT | |
2613 print_thread_state_on(st); | |
2614 _safepoint_state->print_on(st); | |
2615 #endif // PRODUCT | |
2616 } | |
2617 | |
2618 // Called by fatal error handler. The difference between this and | |
2619 // JavaThread::print() is that we can't grab lock or allocate memory. | |
2620 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
2621 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
2622 oop thread_obj = threadObj(); | |
2623 if (thread_obj != NULL) { | |
2624 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
2625 } | |
2626 st->print(" ["); | |
2627 st->print("%s", _get_thread_state_name(_thread_state)); | |
2628 if (osthread()) { | |
2629 st->print(", id=%d", osthread()->thread_id()); | |
2630 } | |
2631 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
2632 _stack_base - _stack_size, _stack_base); | |
2633 st->print("]"); | |
2634 return; | |
2635 } | |
2636 | |
2637 // Verification | |
2638 | |
2639 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
2640 | |
2641 void JavaThread::verify() { | |
2642 // Verify oops in the thread. | |
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2643 oops_do(&VerifyOopClosure::verify_oop, NULL); |
0 | 2644 |
2645 // Verify the stack frames. | |
2646 frames_do(frame_verify); | |
2647 } | |
2648 | |
2649 // CR 6300358 (sub-CR 2137150) | |
2650 // Most callers of this method assume that it can't return NULL but a | |
2651 // thread may not have a name whilst it is in the process of attaching to | |
2652 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
2653 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
2654 // if vm exit occurs during initialization). These cases can all be accounted | |
2655 // for such that this method never returns NULL. | |
2656 const char* JavaThread::get_thread_name() const { | |
2657 #ifdef ASSERT | |
2658 // early safepoints can hit while current thread does not yet have TLS | |
2659 if (!SafepointSynchronize::is_at_safepoint()) { | |
2660 Thread *cur = Thread::current(); | |
2661 if (!(cur->is_Java_thread() && cur == this)) { | |
2662 // Current JavaThreads are allowed to get their own name without | |
2663 // the Threads_lock. | |
2664 assert_locked_or_safepoint(Threads_lock); | |
2665 } | |
2666 } | |
2667 #endif // ASSERT | |
2668 return get_thread_name_string(); | |
2669 } | |
2670 | |
2671 // Returns a non-NULL representation of this thread's name, or a suitable | |
2672 // descriptive string if there is no set name | |
2673 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
2674 const char* name_str; | |
2675 oop thread_obj = threadObj(); | |
2676 if (thread_obj != NULL) { | |
2677 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
2678 if (name != NULL) { | |
2679 if (buf == NULL) { | |
2680 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2681 } | |
2682 else { | |
2683 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
2684 } | |
2685 } | |
2686 else if (is_attaching()) { // workaround for 6412693 - see 6404306 | |
2687 name_str = "<no-name - thread is attaching>"; | |
2688 } | |
2689 else { | |
2690 name_str = Thread::name(); | |
2691 } | |
2692 } | |
2693 else { | |
2694 name_str = Thread::name(); | |
2695 } | |
2696 assert(name_str != NULL, "unexpected NULL thread name"); | |
2697 return name_str; | |
2698 } | |
2699 | |
2700 | |
2701 const char* JavaThread::get_threadgroup_name() const { | |
2702 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2703 oop thread_obj = threadObj(); | |
2704 if (thread_obj != NULL) { | |
2705 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2706 if (thread_group != NULL) { | |
2707 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
2708 // ThreadGroup.name can be null | |
2709 if (name != NULL) { | |
2710 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2711 return str; | |
2712 } | |
2713 } | |
2714 } | |
2715 return NULL; | |
2716 } | |
2717 | |
2718 const char* JavaThread::get_parent_name() const { | |
2719 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2720 oop thread_obj = threadObj(); | |
2721 if (thread_obj != NULL) { | |
2722 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2723 if (thread_group != NULL) { | |
2724 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
2725 if (parent != NULL) { | |
2726 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
2727 // ThreadGroup.name can be null | |
2728 if (name != NULL) { | |
2729 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2730 return str; | |
2731 } | |
2732 } | |
2733 } | |
2734 } | |
2735 return NULL; | |
2736 } | |
2737 | |
2738 ThreadPriority JavaThread::java_priority() const { | |
2739 oop thr_oop = threadObj(); | |
2740 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
2741 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
2742 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
2743 return priority; | |
2744 } | |
2745 | |
2746 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
2747 | |
2748 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
2749 // Link Java Thread object <-> C++ Thread | |
2750 | |
2751 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
2752 // and put it into a new Handle. The Handle "thread_oop" can then | |
2753 // be used to pass the C++ thread object to other methods. | |
2754 | |
2755 // Set the Java level thread object (jthread) field of the | |
2756 // new thread (a JavaThread *) to C++ thread object using the | |
2757 // "thread_oop" handle. | |
2758 | |
2759 // Set the thread field (a JavaThread *) of the | |
2760 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
2761 | |
2762 Handle thread_oop(Thread::current(), | |
2763 JNIHandles::resolve_non_null(jni_thread)); | |
2764 assert(instanceKlass::cast(thread_oop->klass())->is_linked(), | |
2765 "must be initialized"); | |
2766 set_threadObj(thread_oop()); | |
2767 java_lang_Thread::set_thread(thread_oop(), this); | |
2768 | |
2769 if (prio == NoPriority) { | |
2770 prio = java_lang_Thread::priority(thread_oop()); | |
2771 assert(prio != NoPriority, "A valid priority should be present"); | |
2772 } | |
2773 | |
2774 // Push the Java priority down to the native thread; needs Threads_lock | |
2775 Thread::set_priority(this, prio); | |
2776 | |
2777 // Add the new thread to the Threads list and set it in motion. | |
2778 // We must have threads lock in order to call Threads::add. | |
2779 // It is crucial that we do not block before the thread is | |
2780 // added to the Threads list for if a GC happens, then the java_thread oop | |
2781 // will not be visited by GC. | |
2782 Threads::add(this); | |
2783 } | |
2784 | |
2785 oop JavaThread::current_park_blocker() { | |
2786 // Support for JSR-166 locks | |
2787 oop thread_oop = threadObj(); | |
242 | 2788 if (thread_oop != NULL && |
2789 JDK_Version::current().supports_thread_park_blocker()) { | |
0 | 2790 return java_lang_Thread::park_blocker(thread_oop); |
2791 } | |
2792 return NULL; | |
2793 } | |
2794 | |
2795 | |
2796 void JavaThread::print_stack_on(outputStream* st) { | |
2797 if (!has_last_Java_frame()) return; | |
2798 ResourceMark rm; | |
2799 HandleMark hm; | |
2800 | |
2801 RegisterMap reg_map(this); | |
2802 vframe* start_vf = last_java_vframe(®_map); | |
2803 int count = 0; | |
2804 for (vframe* f = start_vf; f; f = f->sender() ) { | |
2805 if (f->is_java_frame()) { | |
2806 javaVFrame* jvf = javaVFrame::cast(f); | |
2807 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
2808 | |
2809 // Print out lock information | |
2810 if (JavaMonitorsInStackTrace) { | |
2811 jvf->print_lock_info_on(st, count); | |
2812 } | |
2813 } else { | |
2814 // Ignore non-Java frames | |
2815 } | |
2816 | |
2817 // Bail-out case for too deep stacks | |
2818 count++; | |
2819 if (MaxJavaStackTraceDepth == count) return; | |
2820 } | |
2821 } | |
2822 | |
2823 | |
2824 // JVMTI PopFrame support | |
2825 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
2826 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
2827 if (in_bytes(size_in_bytes) != 0) { | |
2828 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes)); | |
2829 _popframe_preserved_args_size = in_bytes(size_in_bytes); | |
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2830 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
0 | 2831 } |
2832 } | |
2833 | |
2834 void* JavaThread::popframe_preserved_args() { | |
2835 return _popframe_preserved_args; | |
2836 } | |
2837 | |
2838 ByteSize JavaThread::popframe_preserved_args_size() { | |
2839 return in_ByteSize(_popframe_preserved_args_size); | |
2840 } | |
2841 | |
2842 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
2843 int sz = in_bytes(popframe_preserved_args_size()); | |
2844 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
2845 return in_WordSize(sz / wordSize); | |
2846 } | |
2847 | |
2848 void JavaThread::popframe_free_preserved_args() { | |
2849 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
2850 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args); | |
2851 _popframe_preserved_args = NULL; | |
2852 _popframe_preserved_args_size = 0; | |
2853 } | |
2854 | |
2855 #ifndef PRODUCT | |
2856 | |
2857 void JavaThread::trace_frames() { | |
2858 tty->print_cr("[Describe stack]"); | |
2859 int frame_no = 1; | |
2860 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2861 tty->print(" %d. ", frame_no++); | |
2862 fst.current()->print_value_on(tty,this); | |
2863 tty->cr(); | |
2864 } | |
2865 } | |
2866 | |
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2867 class PrintAndVerifyOopClosure: public OopClosure { |
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2868 protected: |
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2869 template <class T> inline void do_oop_work(T* p) { |
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2870 oop obj = oopDesc::load_decode_heap_oop(p); |
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2871 if (obj == NULL) return; |
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2872 tty->print(INTPTR_FORMAT ": ", p); |
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2873 if (obj->is_oop_or_null()) { |
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2874 if (obj->is_objArray()) { |
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|
2875 tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj); |
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|
2876 } else { |
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|
2877 obj->print(); |
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|
2878 } |
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|
2879 } else { |
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|
2880 tty->print_cr("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj); |
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|
2881 } |
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|
2882 tty->cr(); |
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|
2883 } |
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|
2884 public: |
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|
2885 virtual void do_oop(oop* p) { do_oop_work(p); } |
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diff
changeset
|
2886 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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|
2887 }; |
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|
2888 |
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|
2889 |
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|
2890 static void oops_print(frame* f, const RegisterMap *map) { |
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|
2891 PrintAndVerifyOopClosure print; |
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|
2892 f->print_value(); |
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|
2893 f->oops_do(&print, NULL, (RegisterMap*)map); |
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|
2894 } |
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|
2895 |
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|
2896 // Print our all the locations that contain oops and whether they are |
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2897 // valid or not. This useful when trying to find the oldest frame |
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2898 // where an oop has gone bad since the frame walk is from youngest to |
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2899 // oldest. |
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|
2900 void JavaThread::trace_oops() { |
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|
2901 tty->print_cr("[Trace oops]"); |
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|
2902 frames_do(oops_print); |
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|
2903 } |
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|
2904 |
0 | 2905 |
3388
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|
2906 #ifdef ASSERT |
3336
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|
2907 // Print or validate the layout of stack frames |
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2908 void JavaThread::print_frame_layout(int depth, bool validate_only) { |
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|
2909 ResourceMark rm; |
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|
2910 PRESERVE_EXCEPTION_MARK; |
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|
2911 FrameValues values; |
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|
2912 int frame_no = 0; |
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|
2913 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) { |
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2914 fst.current()->describe(values, ++frame_no); |
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2915 if (depth == frame_no) break; |
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|
2916 } |
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|
2917 if (validate_only) { |
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|
2918 values.validate(); |
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|
2919 } else { |
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|
2920 tty->print_cr("[Describe stack layout]"); |
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2921 values.print(); |
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|
2922 } |
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|
2923 } |
3388
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|
2924 #endif |
3336
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|
2925 |
0 | 2926 void JavaThread::trace_stack_from(vframe* start_vf) { |
2927 ResourceMark rm; | |
2928 int vframe_no = 1; | |
2929 for (vframe* f = start_vf; f; f = f->sender() ) { | |
2930 if (f->is_java_frame()) { | |
2931 javaVFrame::cast(f)->print_activation(vframe_no++); | |
2932 } else { | |
2933 f->print(); | |
2934 } | |
2935 if (vframe_no > StackPrintLimit) { | |
2936 tty->print_cr("...<more frames>..."); | |
2937 return; | |
2938 } | |
2939 } | |
2940 } | |
2941 | |
2942 | |
2943 void JavaThread::trace_stack() { | |
2944 if (!has_last_Java_frame()) return; | |
2945 ResourceMark rm; | |
2946 HandleMark hm; | |
2947 RegisterMap reg_map(this); | |
2948 trace_stack_from(last_java_vframe(®_map)); | |
2949 } | |
2950 | |
2951 | |
2952 #endif // PRODUCT | |
2953 | |
2954 | |
2955 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
2956 assert(reg_map != NULL, "a map must be given"); | |
2957 frame f = last_frame(); | |
2958 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
2959 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
2960 } | |
2961 return NULL; | |
2962 } | |
2963 | |
2964 | |
2965 klassOop JavaThread::security_get_caller_class(int depth) { | |
2966 vframeStream vfst(this); | |
2967 vfst.security_get_caller_frame(depth); | |
2968 if (!vfst.at_end()) { | |
2969 return vfst.method()->method_holder(); | |
2970 } | |
2971 return NULL; | |
2972 } | |
2973 | |
2974 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
2975 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
2976 CompileBroker::compiler_thread_loop(); | |
2977 } | |
2978 | |
2979 // Create a CompilerThread | |
2980 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
2981 : JavaThread(&compiler_thread_entry) { | |
2982 _env = NULL; | |
2983 _log = NULL; | |
2984 _task = NULL; | |
2985 _queue = queue; | |
2986 _counters = counters; | |
1584 | 2987 _buffer_blob = NULL; |
3384
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6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
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|
2988 _scanned_nmethod = NULL; |
0 | 2989 |
2990 #ifndef PRODUCT | |
2991 _ideal_graph_printer = NULL; | |
2992 #endif | |
2993 } | |
2994 | |
3384
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6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
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|
2995 void CompilerThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
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6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
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|
2996 JavaThread::oops_do(f, cf); |
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6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
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|
2997 if (_scanned_nmethod != NULL && cf != NULL) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
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changeset
|
2998 // Safepoints can occur when the sweeper is scanning an nmethod so |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
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changeset
|
2999 // process it here to make sure it isn't unloaded in the middle of |
f52ed367b66d
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changeset
|
3000 // a scan. |
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parents:
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|
3001 cf->do_code_blob(_scanned_nmethod); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
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diff
changeset
|
3002 } |
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|
3003 } |
0 | 3004 |
3005 // ======= Threads ======== | |
3006 | |
3007 // The Threads class links together all active threads, and provides | |
3008 // operations over all threads. It is protected by its own Mutex | |
3009 // lock, which is also used in other contexts to protect thread | |
3010 // operations from having the thread being operated on from exiting | |
3011 // and going away unexpectedly (e.g., safepoint synchronization) | |
3012 | |
3013 JavaThread* Threads::_thread_list = NULL; | |
3014 int Threads::_number_of_threads = 0; | |
3015 int Threads::_number_of_non_daemon_threads = 0; | |
3016 int Threads::_return_code = 0; | |
3017 size_t JavaThread::_stack_size_at_create = 0; | |
3018 | |
3019 // All JavaThreads | |
3020 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
3021 | |
3022 void os_stream(); | |
3023 | |
3024 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
3025 void Threads::threads_do(ThreadClosure* tc) { | |
3026 assert_locked_or_safepoint(Threads_lock); | |
3027 // ALL_JAVA_THREADS iterates through all JavaThreads | |
3028 ALL_JAVA_THREADS(p) { | |
3029 tc->do_thread(p); | |
3030 } | |
3031 // Someday we could have a table or list of all non-JavaThreads. | |
3032 // For now, just manually iterate through them. | |
3033 tc->do_thread(VMThread::vm_thread()); | |
3034 Universe::heap()->gc_threads_do(tc); | |
323
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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|
3035 WatcherThread *wt = WatcherThread::watcher_thread(); |
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6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
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|
3036 // Strictly speaking, the following NULL check isn't sufficient to make sure |
b33eef719520
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|
3037 // the data for WatcherThread is still valid upon being examined. However, |
b33eef719520
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diff
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|
3038 // considering that WatchThread terminates when the VM is on the way to |
b33eef719520
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|
3039 // exit at safepoint, the chance of the above is extremely small. The right |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
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|
3040 // way to prevent termination of WatcherThread would be to acquire |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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diff
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|
3041 // Terminator_lock, but we can't do that without violating the lock rank |
b33eef719520
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|
3042 // checking in some cases. |
b33eef719520
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|
3043 if (wt != NULL) |
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|
3044 tc->do_thread(wt); |
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|
3045 |
0 | 3046 // If CompilerThreads ever become non-JavaThreads, add them here |
3047 } | |
3048 | |
3049 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
3050 | |
242 | 3051 extern void JDK_Version_init(); |
3052 | |
0 | 3053 // Check version |
3054 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
3055 | |
3056 // Initialize the output stream module | |
3057 ostream_init(); | |
3058 | |
3059 // Process java launcher properties. | |
3060 Arguments::process_sun_java_launcher_properties(args); | |
3061 | |
3062 // Initialize the os module before using TLS | |
3063 os::init(); | |
3064 | |
3065 // Initialize system properties. | |
3066 Arguments::init_system_properties(); | |
3067 | |
242 | 3068 // So that JDK version can be used as a discrimintor when parsing arguments |
3069 JDK_Version_init(); | |
3070 | |
1864
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3071 // Update/Initialize System properties after JDK version number is known |
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3072 Arguments::init_version_specific_system_properties(); |
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3073 |
0 | 3074 // Parse arguments |
3075 jint parse_result = Arguments::parse(args); | |
3076 if (parse_result != JNI_OK) return parse_result; | |
3077 | |
3078 if (PauseAtStartup) { | |
3079 os::pause(); | |
3080 } | |
3081 | |
3082 HS_DTRACE_PROBE(hotspot, vm__init__begin); | |
3083 | |
3084 // Record VM creation timing statistics | |
3085 TraceVmCreationTime create_vm_timer; | |
3086 create_vm_timer.start(); | |
3087 | |
3088 // Timing (must come after argument parsing) | |
3089 TraceTime timer("Create VM", TraceStartupTime); | |
3090 | |
3091 // Initialize the os module after parsing the args | |
3092 jint os_init_2_result = os::init_2(); | |
3093 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
3094 | |
3095 // Initialize output stream logging | |
3096 ostream_init_log(); | |
3097 | |
3098 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
3099 // Must be before create_vm_init_agents() | |
3100 if (Arguments::init_libraries_at_startup()) { | |
3101 convert_vm_init_libraries_to_agents(); | |
3102 } | |
3103 | |
3104 // Launch -agentlib/-agentpath and converted -Xrun agents | |
3105 if (Arguments::init_agents_at_startup()) { | |
3106 create_vm_init_agents(); | |
3107 } | |
3108 | |
3109 // Initialize Threads state | |
3110 _thread_list = NULL; | |
3111 _number_of_threads = 0; | |
3112 _number_of_non_daemon_threads = 0; | |
3113 | |
3114 // Initialize TLS | |
3115 ThreadLocalStorage::init(); | |
3116 | |
3117 // Initialize global data structures and create system classes in heap | |
3118 vm_init_globals(); | |
3119 | |
3120 // Attach the main thread to this os thread | |
3121 JavaThread* main_thread = new JavaThread(); | |
3122 main_thread->set_thread_state(_thread_in_vm); | |
3123 // must do this before set_active_handles and initialize_thread_local_storage | |
3124 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
3125 // change the stack size recorded here to one based on the java thread | |
3126 // stacksize. This adjusted size is what is used to figure the placement | |
3127 // of the guard pages. | |
3128 main_thread->record_stack_base_and_size(); | |
3129 main_thread->initialize_thread_local_storage(); | |
3130 | |
3131 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
3132 | |
3133 if (!main_thread->set_as_starting_thread()) { | |
3134 vm_shutdown_during_initialization( | |
3135 "Failed necessary internal allocation. Out of swap space"); | |
3136 delete main_thread; | |
3137 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3138 return JNI_ENOMEM; | |
3139 } | |
3140 | |
3141 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
3142 // crash Linux VM, see notes in os_linux.cpp. | |
3143 main_thread->create_stack_guard_pages(); | |
3144 | |
1878 | 3145 // Initialize Java-Level synchronization subsystem |
3146 ObjectMonitor::Initialize() ; | |
0 | 3147 |
3148 // Initialize global modules | |
3149 jint status = init_globals(); | |
3150 if (status != JNI_OK) { | |
3151 delete main_thread; | |
3152 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3153 return status; | |
3154 } | |
3155 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3156 // Should be done after the heap is fully created |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3157 main_thread->cache_global_variables(); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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1608
diff
changeset
|
3158 |
0 | 3159 HandleMark hm; |
3160 | |
3161 { MutexLocker mu(Threads_lock); | |
3162 Threads::add(main_thread); | |
3163 } | |
3164 | |
3165 // Any JVMTI raw monitors entered in onload will transition into | |
3166 // real raw monitor. VM is setup enough here for raw monitor enter. | |
3167 JvmtiExport::transition_pending_onload_raw_monitors(); | |
3168 | |
3169 if (VerifyBeforeGC && | |
3170 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
3171 Universe::heap()->prepare_for_verify(); | |
3172 Universe::verify(); // make sure we're starting with a clean slate | |
3173 } | |
3174 | |
3175 // Create the VMThread | |
3176 { TraceTime timer("Start VMThread", TraceStartupTime); | |
3177 VMThread::create(); | |
3178 Thread* vmthread = VMThread::vm_thread(); | |
3179 | |
3180 if (!os::create_thread(vmthread, os::vm_thread)) | |
3181 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
3182 | |
3183 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
3184 // Monitors can have spurious returns, must always check another state flag | |
3185 { | |
3186 MutexLocker ml(Notify_lock); | |
3187 os::start_thread(vmthread); | |
3188 while (vmthread->active_handles() == NULL) { | |
3189 Notify_lock->wait(); | |
3190 } | |
3191 } | |
3192 } | |
3193 | |
3194 assert (Universe::is_fully_initialized(), "not initialized"); | |
3195 EXCEPTION_MARK; | |
3196 | |
3197 // At this point, the Universe is initialized, but we have not executed | |
3198 // any byte code. Now is a good time (the only time) to dump out the | |
3199 // internal state of the JVM for sharing. | |
3200 | |
3201 if (DumpSharedSpaces) { | |
3202 Universe::heap()->preload_and_dump(CHECK_0); | |
3203 ShouldNotReachHere(); | |
3204 } | |
3205 | |
3206 // Always call even when there are not JVMTI environments yet, since environments | |
3207 // may be attached late and JVMTI must track phases of VM execution | |
3208 JvmtiExport::enter_start_phase(); | |
3209 | |
3210 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
3211 JvmtiExport::post_vm_start(); | |
3212 | |
3213 { | |
3214 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
3215 | |
3216 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3217 create_vm_init_libraries(); | |
3218 } | |
3219 | |
3220 if (InitializeJavaLangString) { | |
2177
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6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3221 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
0 | 3222 } else { |
3223 warning("java.lang.String not initialized"); | |
3224 } | |
3225 | |
18
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3226 if (AggressiveOpts) { |
192
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3227 { |
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diff
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|
3228 // Forcibly initialize java/util/HashMap and mutate the private |
6d13fcb3663f
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|
3229 // static final "frontCacheEnabled" field before we start creating instances |
18
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diff
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|
3230 #ifdef ASSERT |
2177
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|
3231 klassOop tmp_k = SystemDictionary::find(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
192
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3232 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
18
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diff
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|
3233 #endif |
2177
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|
3234 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
192
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3235 KlassHandle k = KlassHandle(THREAD, k_o); |
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|
3236 guarantee(k.not_null(), "Must find java/util/HashMap"); |
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|
3237 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
6d13fcb3663f
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kvn
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62
diff
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|
3238 ik->initialize(CHECK_0); |
6d13fcb3663f
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kvn
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diff
changeset
|
3239 fieldDescriptor fd; |
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diff
changeset
|
3240 // Possible we might not find this field; if so, don't break |
6d13fcb3663f
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|
3241 if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
2376
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|
3242 k()->java_mirror()->bool_field_put(fd.offset(), true); |
192
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|
3243 } |
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diff
changeset
|
3244 } |
6d13fcb3663f
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diff
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|
3245 |
6d13fcb3663f
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kvn
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diff
changeset
|
3246 if (UseStringCache) { |
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
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diff
changeset
|
3247 // Forcibly initialize java/lang/StringValue and mutate the private |
192
6d13fcb3663f
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changeset
|
3248 // static final "stringCacheEnabled" field before we start creating instances |
2177
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coleenp
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2162
diff
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|
3249 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbols::java_lang_StringValue(), Handle(), Handle(), CHECK_0); |
669
eca19a8425b5
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parents:
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diff
changeset
|
3250 // 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
parents:
441
diff
changeset
|
3251 if (k_o != NULL) { |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
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441
diff
changeset
|
3252 KlassHandle k = KlassHandle(THREAD, k_o); |
eca19a8425b5
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diff
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|
3253 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
eca19a8425b5
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diff
changeset
|
3254 ik->initialize(CHECK_0); |
eca19a8425b5
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phh
parents:
441
diff
changeset
|
3255 fieldDescriptor fd; |
eca19a8425b5
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phh
parents:
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diff
changeset
|
3256 // Possible we might not find this field: if so, silently don't break |
eca19a8425b5
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441
diff
changeset
|
3257 if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
2376
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diff
changeset
|
3258 k()->java_mirror()->bool_field_put(fd.offset(), true); |
669
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diff
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|
3259 } |
192
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diff
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|
3260 } |
18
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
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parents:
0
diff
changeset
|
3261 } |
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phh
parents:
0
diff
changeset
|
3262 } |
c7d713375c94
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phh
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0
diff
changeset
|
3263 |
0 | 3264 // Initialize java_lang.System (needed before creating the thread) |
3265 if (InitializeJavaLangSystem) { | |
2177
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|
3266 initialize_class(vmSymbols::java_lang_System(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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diff
changeset
|
3267 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); |
0 | 3268 Handle thread_group = create_initial_thread_group(CHECK_0); |
3269 Universe::set_main_thread_group(thread_group()); | |
2177
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diff
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|
3270 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); |
0 | 3271 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); |
3272 main_thread->set_threadObj(thread_object); | |
3273 // Set thread status to running since main thread has | |
3274 // been started and running. | |
3275 java_lang_Thread::set_thread_status(thread_object, | |
3276 java_lang_Thread::RUNNABLE); | |
3277 | |
3278 // The VM preresolve methods to these classes. Make sure that get initialized | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3279 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3280 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); |
0 | 3281 // The VM creates & returns objects of this class. Make sure it's initialized. |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
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diff
changeset
|
3282 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); |
0 | 3283 call_initializeSystemClass(CHECK_0); |
3284 } else { | |
3285 warning("java.lang.System not initialized"); | |
3286 } | |
3287 | |
3288 // an instance of OutOfMemory exception has been allocated earlier | |
3289 if (InitializeJavaLangExceptionsErrors) { | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3290 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3291 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3292 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3293 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3294 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3295 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3296 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); |
0 | 3297 } else { |
3298 warning("java.lang.OutOfMemoryError has not been initialized"); | |
3299 warning("java.lang.NullPointerException has not been initialized"); | |
3300 warning("java.lang.ClassCastException has not been initialized"); | |
3301 warning("java.lang.ArrayStoreException has not been initialized"); | |
3302 warning("java.lang.ArithmeticException has not been initialized"); | |
3303 warning("java.lang.StackOverflowError has not been initialized"); | |
3304 } | |
2416
38fea01eb669
6817525: turn on method handle functionality by default for JSR 292
twisti
parents:
2376
diff
changeset
|
3305 } |
0 | 3306 |
3307 // See : bugid 4211085. | |
3308 // Background : the static initializer of java.lang.Compiler tries to read | |
3309 // property"java.compiler" and read & write property "java.vm.info". | |
3310 // When a security manager is installed through the command line | |
3311 // option "-Djava.security.manager", the above properties are not | |
3312 // readable and the static initializer for java.lang.Compiler fails | |
3313 // resulting in a NoClassDefFoundError. This can happen in any | |
3314 // user code which calls methods in java.lang.Compiler. | |
3315 // Hack : the hack is to pre-load and initialize this class, so that only | |
3316 // system domains are on the stack when the properties are read. | |
3317 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
3318 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
3319 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
3320 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
3321 // Once that is done, we should remove this hack. | |
2177
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coleenp
parents:
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diff
changeset
|
3322 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
0 | 3323 |
3324 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
3325 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
3326 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
3327 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
3328 // This should also be taken out as soon as 4211383 gets fixed. | |
3329 reset_vm_info_property(CHECK_0); | |
3330 | |
3331 quicken_jni_functions(); | |
3332 | |
3333 // Set flag that basic initialization has completed. Used by exceptions and various | |
3334 // debug stuff, that does not work until all basic classes have been initialized. | |
3335 set_init_completed(); | |
3336 | |
3337 HS_DTRACE_PROBE(hotspot, vm__init__end); | |
3338 | |
3339 // record VM initialization completion time | |
3340 Management::record_vm_init_completed(); | |
3341 | |
3342 // Compute system loader. Note that this has to occur after set_init_completed, since | |
3343 // valid exceptions may be thrown in the process. | |
3344 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
3345 // set_init_completed has just been called, causing exceptions not to be shortcut | |
3346 // anymore. We call vm_exit_during_initialization directly instead. | |
3347 SystemDictionary::compute_java_system_loader(THREAD); | |
3348 if (HAS_PENDING_EXCEPTION) { | |
3349 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3350 } | |
3351 | |
3352 #ifndef SERIALGC | |
3353 // Support for ConcurrentMarkSweep. This should be cleaned up | |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3354 // and better encapsulated. The ugly nested if test would go away |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3355 // once things are properly refactored. XXX YSR |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3356 if (UseConcMarkSweepGC || UseG1GC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3357 if (UseConcMarkSweepGC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3358 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3359 } else { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3360 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
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62
diff
changeset
|
3361 } |
0 | 3362 if (HAS_PENDING_EXCEPTION) { |
3363 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3364 } | |
3365 } | |
3366 #endif // SERIALGC | |
3367 | |
3368 // Always call even when there are not JVMTI environments yet, since environments | |
3369 // may be attached late and JVMTI must track phases of VM execution | |
3370 JvmtiExport::enter_live_phase(); | |
3371 | |
3372 // Signal Dispatcher needs to be started before VMInit event is posted | |
3373 os::signal_init(); | |
3374 | |
3375 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
3376 if (!DisableAttachMechanism) { | |
3377 if (StartAttachListener || AttachListener::init_at_startup()) { | |
3378 AttachListener::init(); | |
3379 } | |
3380 } | |
3381 | |
3382 // Launch -Xrun agents | |
3383 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
3384 // back-end can launch with -Xdebug -Xrunjdwp. | |
3385 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3386 create_vm_init_libraries(); | |
3387 } | |
3388 | |
3389 // Notify JVMTI agents that VM initialization is complete - nop if no agents. | |
3390 JvmtiExport::post_vm_initialized(); | |
3391 | |
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3392 if (CleanChunkPoolAsync) { |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3393 Chunk::start_chunk_pool_cleaner_task(); |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3394 } |
0 | 3395 |
3396 // initialize compiler(s) | |
3397 CompileBroker::compilation_init(); | |
3398 | |
3399 Management::initialize(THREAD); | |
3400 if (HAS_PENDING_EXCEPTION) { | |
3401 // management agent fails to start possibly due to | |
3402 // configuration problem and is responsible for printing | |
3403 // stack trace if appropriate. Simply exit VM. | |
3404 vm_exit(1); | |
3405 } | |
3406 | |
3407 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
3408 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
3409 if (MemProfiling) MemProfiler::engage(); | |
3410 StatSampler::engage(); | |
3411 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
3412 | |
3413 BiasedLocking::init(); | |
3414 | |
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
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2126
diff
changeset
|
3415 if (JDK_Version::current().post_vm_init_hook_enabled()) { |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3416 call_postVMInitHook(THREAD); |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3417 // The Java side of PostVMInitHook.run must deal with all |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3418 // exceptions and provide means of diagnosis. |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3419 if (HAS_PENDING_EXCEPTION) { |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
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2126
diff
changeset
|
3420 CLEAR_PENDING_EXCEPTION; |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3421 } |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
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2126
diff
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|
3422 } |
0 | 3423 |
3424 // Start up the WatcherThread if there are any periodic tasks | |
3425 // NOTE: All PeriodicTasks should be registered by now. If they | |
3426 // aren't, late joiners might appear to start slowly (we might | |
3427 // take a while to process their first tick). | |
3428 if (PeriodicTask::num_tasks() > 0) { | |
3429 WatcherThread::start(); | |
3430 } | |
3431 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3432 // Give os specific code one last chance to start |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3433 os::init_3(); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3434 |
0 | 3435 create_vm_timer.end(); |
3436 return JNI_OK; | |
3437 } | |
3438 | |
3439 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
3440 extern "C" { | |
3441 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
3442 } | |
3443 // Find a command line agent library and return its entry point for | |
3444 // -agentlib: -agentpath: -Xrun | |
3445 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
3446 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
3447 OnLoadEntry_t on_load_entry = NULL; | |
3448 void *library = agent->os_lib(); // check if we have looked it up before | |
3449 | |
3450 if (library == NULL) { | |
3451 char buffer[JVM_MAXPATHLEN]; | |
3452 char ebuf[1024]; | |
3453 const char *name = agent->name(); | |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3454 const char *msg = "Could not find agent library "; |
0 | 3455 |
3456 if (agent->is_absolute_path()) { | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3457 library = os::dll_load(name, ebuf, sizeof ebuf); |
0 | 3458 if (library == NULL) { |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3459 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
parents:
1681
diff
changeset
|
3460 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
parents:
1681
diff
changeset
|
3461 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
|
3462 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3463 // 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
|
3464 vm_exit_during_initialization(buf, NULL); |
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6378314: Bad warning message when agent library not found. local directory is not searched.
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3465 FREE_C_HEAP_ARRAY(char, buf); |
0 | 3466 } |
3467 } else { | |
3468 // Try to load the agent from the standard dll directory | |
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|
3469 os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), name); |
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|
3470 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3471 #ifdef KERNEL |
3472 // Download instrument dll | |
3473 if (library == NULL && strcmp(name, "instrument") == 0) { | |
3474 char *props = Arguments::get_kernel_properties(); | |
3475 char *home = Arguments::get_java_home(); | |
3476 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
3477 " sun.jkernel.DownloadManager -download client_jvm"; | |
1694
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|
3478 size_t length = strlen(props) + strlen(home) + strlen(fmt) + 1; |
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3479 char *cmd = NEW_C_HEAP_ARRAY(char, length); |
0 | 3480 jio_snprintf(cmd, length, fmt, home, props); |
3481 int status = os::fork_and_exec(cmd); | |
3482 FreeHeap(props); | |
3483 if (status == -1) { | |
3484 warning(cmd); | |
3485 vm_exit_during_initialization("fork_and_exec failed: %s", | |
3486 strerror(errno)); | |
3487 } | |
1694
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|
3488 FREE_C_HEAP_ARRAY(char, cmd); |
0 | 3489 // when this comes back the instrument.dll should be where it belongs. |
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3490 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3491 } |
3492 #endif // KERNEL | |
3493 if (library == NULL) { // Try the local directory | |
3494 char ns[1] = {0}; | |
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|
3495 os::dll_build_name(buffer, sizeof(buffer), ns, name); |
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|
3496 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3497 if (library == NULL) { |
1694
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|
3498 const char *sub_msg = " on the library path, with error: "; |
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|
3499 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
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|
3500 char *buf = NEW_C_HEAP_ARRAY(char, len); |
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|
3501 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3502 // If we can't find the agent, exit. |
1694
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|
3503 vm_exit_during_initialization(buf, NULL); |
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3504 FREE_C_HEAP_ARRAY(char, buf); |
0 | 3505 } |
3506 } | |
3507 } | |
3508 agent->set_os_lib(library); | |
3509 } | |
3510 | |
3511 // Find the OnLoad function. | |
3512 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
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3513 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, os::dll_lookup(library, on_load_symbols[symbol_index])); |
0 | 3514 if (on_load_entry != NULL) break; |
3515 } | |
3516 return on_load_entry; | |
3517 } | |
3518 | |
3519 // Find the JVM_OnLoad entry point | |
3520 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
3521 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
3522 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3523 } | |
3524 | |
3525 // Find the Agent_OnLoad entry point | |
3526 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
3527 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
3528 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3529 } | |
3530 | |
3531 // For backwards compatibility with -Xrun | |
3532 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
3533 // treated like -agentpath: | |
3534 // Must be called before agent libraries are created | |
3535 void Threads::convert_vm_init_libraries_to_agents() { | |
3536 AgentLibrary* agent; | |
3537 AgentLibrary* next; | |
3538 | |
3539 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
3540 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
3541 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3542 | |
3543 // If there is an JVM_OnLoad function it will get called later, | |
3544 // otherwise see if there is an Agent_OnLoad | |
3545 if (on_load_entry == NULL) { | |
3546 on_load_entry = lookup_agent_on_load(agent); | |
3547 if (on_load_entry != NULL) { | |
3548 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
3549 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
3550 Arguments::convert_library_to_agent(agent); | |
3551 } else { | |
3552 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
3553 } | |
3554 } | |
3555 } | |
3556 } | |
3557 | |
3558 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
3559 // Invokes Agent_OnLoad | |
3560 // Called very early -- before JavaThreads exist | |
3561 void Threads::create_vm_init_agents() { | |
3562 extern struct JavaVM_ main_vm; | |
3563 AgentLibrary* agent; | |
3564 | |
3565 JvmtiExport::enter_onload_phase(); | |
3566 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3567 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
3568 | |
3569 if (on_load_entry != NULL) { | |
3570 // Invoke the Agent_OnLoad function | |
3571 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3572 if (err != JNI_OK) { | |
3573 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
3574 } | |
3575 } else { | |
3576 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
3577 } | |
3578 } | |
3579 JvmtiExport::enter_primordial_phase(); | |
3580 } | |
3581 | |
3582 extern "C" { | |
3583 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
3584 } | |
3585 | |
3586 void Threads::shutdown_vm_agents() { | |
3587 // Send any Agent_OnUnload notifications | |
3588 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
3589 extern struct JavaVM_ main_vm; | |
3590 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3591 | |
3592 // Find the Agent_OnUnload function. | |
3593 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
3594 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
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diff
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|
3595 os::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
0 | 3596 |
3597 // Invoke the Agent_OnUnload function | |
3598 if (unload_entry != NULL) { | |
3599 JavaThread* thread = JavaThread::current(); | |
3600 ThreadToNativeFromVM ttn(thread); | |
3601 HandleMark hm(thread); | |
3602 (*unload_entry)(&main_vm); | |
3603 break; | |
3604 } | |
3605 } | |
3606 } | |
3607 } | |
3608 | |
3609 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
3610 // Invokes JVM_OnLoad | |
3611 void Threads::create_vm_init_libraries() { | |
3612 extern struct JavaVM_ main_vm; | |
3613 AgentLibrary* agent; | |
3614 | |
3615 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
3616 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3617 | |
3618 if (on_load_entry != NULL) { | |
3619 // Invoke the JVM_OnLoad function | |
3620 JavaThread* thread = JavaThread::current(); | |
3621 ThreadToNativeFromVM ttn(thread); | |
3622 HandleMark hm(thread); | |
3623 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3624 if (err != JNI_OK) { | |
3625 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
3626 } | |
3627 } else { | |
3628 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
3629 } | |
3630 } | |
3631 } | |
3632 | |
3633 // Last thread running calls java.lang.Shutdown.shutdown() | |
3634 void JavaThread::invoke_shutdown_hooks() { | |
3635 HandleMark hm(this); | |
3636 | |
3637 // We could get here with a pending exception, if so clear it now. | |
3638 if (this->has_pending_exception()) { | |
3639 this->clear_pending_exception(); | |
3640 } | |
3641 | |
3642 EXCEPTION_MARK; | |
3643 klassOop k = | |
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3644 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
0 | 3645 THREAD); |
3646 if (k != NULL) { | |
3647 // SystemDictionary::resolve_or_null will return null if there was | |
3648 // an exception. If we cannot load the Shutdown class, just don't | |
3649 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
3650 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
3651 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
3652 // was called, the Shutdown class would have already been loaded | |
3653 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
3654 instanceKlassHandle shutdown_klass (THREAD, k); | |
3655 JavaValue result(T_VOID); | |
3656 JavaCalls::call_static(&result, | |
3657 shutdown_klass, | |
2177
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3658 vmSymbols::shutdown_method_name(), |
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|
3659 vmSymbols::void_method_signature(), |
0 | 3660 THREAD); |
3661 } | |
3662 CLEAR_PENDING_EXCEPTION; | |
3663 } | |
3664 | |
3665 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
3666 // the program falls off the end of main(). Another VM exit path is through | |
3667 // vm_exit() when the program calls System.exit() to return a value or when | |
3668 // there is a serious error in VM. The two shutdown paths are not exactly | |
3669 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
3670 // and VM_Exit op at VM level. | |
3671 // | |
3672 // Shutdown sequence: | |
3673 // + Wait until we are the last non-daemon thread to execute | |
3674 // <-- every thing is still working at this moment --> | |
3675 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
3676 // shutdown hooks, run finalizers if finalization-on-exit | |
3677 // + Call before_exit(), prepare for VM exit | |
3678 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
3679 // currently the only user of this mechanism is File.deleteOnExit()) | |
3680 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
3681 // post thread end and vm death events to JVMTI, | |
3682 // stop signal thread | |
3683 // + Call JavaThread::exit(), it will: | |
3684 // > release JNI handle blocks, remove stack guard pages | |
3685 // > remove this thread from Threads list | |
3686 // <-- no more Java code from this thread after this point --> | |
3687 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
3688 // the compiler threads at safepoint | |
3689 // <-- do not use anything that could get blocked by Safepoint --> | |
3690 // + Disable tracing at JNI/JVM barriers | |
3691 // + Set _vm_exited flag for threads that are still running native code | |
3692 // + Delete this thread | |
3693 // + Call exit_globals() | |
3694 // > deletes tty | |
3695 // > deletes PerfMemory resources | |
3696 // + Return to caller | |
3697 | |
3698 bool Threads::destroy_vm() { | |
3699 JavaThread* thread = JavaThread::current(); | |
3700 | |
3701 // Wait until we are the last non-daemon thread to execute | |
3702 { MutexLocker nu(Threads_lock); | |
3703 while (Threads::number_of_non_daemon_threads() > 1 ) | |
3704 // This wait should make safepoint checks, wait without a timeout, | |
3705 // and wait as a suspend-equivalent condition. | |
3706 // | |
3707 // Note: If the FlatProfiler is running and this thread is waiting | |
3708 // for another non-daemon thread to finish, then the FlatProfiler | |
3709 // is waiting for the external suspend request on this thread to | |
3710 // complete. wait_for_ext_suspend_completion() will eventually | |
3711 // timeout, but that takes time. Making this wait a suspend- | |
3712 // equivalent condition solves that timeout problem. | |
3713 // | |
3714 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
3715 Mutex::_as_suspend_equivalent_flag); | |
3716 } | |
3717 | |
3718 // Hang forever on exit if we are reporting an error. | |
3719 if (ShowMessageBoxOnError && is_error_reported()) { | |
3720 os::infinite_sleep(); | |
3721 } | |
2302
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3722 os::wait_for_keypress_at_exit(); |
0 | 3723 |
3724 if (JDK_Version::is_jdk12x_version()) { | |
3725 // We are the last thread running, so check if finalizers should be run. | |
3726 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
3727 HandleMark rm(thread); | |
3728 Universe::run_finalizers_on_exit(); | |
3729 } else { | |
3730 // run Java level shutdown hooks | |
3731 thread->invoke_shutdown_hooks(); | |
3732 } | |
3733 | |
3734 before_exit(thread); | |
3735 | |
3736 thread->exit(true); | |
3737 | |
3738 // Stop VM thread. | |
3739 { | |
3740 // 4945125 The vm thread comes to a safepoint during exit. | |
3741 // GC vm_operations can get caught at the safepoint, and the | |
3742 // heap is unparseable if they are caught. Grab the Heap_lock | |
3743 // to prevent this. The GC vm_operations will not be able to | |
3744 // queue until after the vm thread is dead. | |
3769
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3745 // After this point, we'll never emerge out of the safepoint before |
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3746 // the VM exits, so concurrent GC threads do not need to be explicitly |
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3747 // stopped; they remain inactive until the process exits. |
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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3748 // Note: some concurrent G1 threads may be running during a safepoint, |
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7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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|
3749 // but these will not be accessing the heap, just some G1-specific side |
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|
3750 // data structures that are not accessed by any other threads but them |
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3751 // after this point in a terminal safepoint. |
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|
3752 |
0 | 3753 MutexLocker ml(Heap_lock); |
3754 | |
3755 VMThread::wait_for_vm_thread_exit(); | |
3756 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
3757 VMThread::destroy(); | |
3758 } | |
3759 | |
3760 // clean up ideal graph printers | |
3761 #if defined(COMPILER2) && !defined(PRODUCT) | |
3762 IdealGraphPrinter::clean_up(); | |
3763 #endif | |
3764 | |
3765 // Now, all Java threads are gone except daemon threads. Daemon threads | |
3766 // running Java code or in VM are stopped by the Safepoint. However, | |
3767 // daemon threads executing native code are still running. But they | |
3768 // will be stopped at native=>Java/VM barriers. Note that we can't | |
3769 // simply kill or suspend them, as it is inherently deadlock-prone. | |
3770 | |
3771 #ifndef PRODUCT | |
3772 // disable function tracing at JNI/JVM barriers | |
3773 TraceJNICalls = false; | |
3774 TraceJVMCalls = false; | |
3775 TraceRuntimeCalls = false; | |
3776 #endif | |
3777 | |
3778 VM_Exit::set_vm_exited(); | |
3779 | |
3780 notify_vm_shutdown(); | |
3781 | |
3782 delete thread; | |
3783 | |
3784 // exit_globals() will delete tty | |
3785 exit_globals(); | |
3786 | |
3787 return true; | |
3788 } | |
3789 | |
3790 | |
3791 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
3792 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
3793 return is_supported_jni_version(version); | |
3794 } | |
3795 | |
3796 | |
3797 jboolean Threads::is_supported_jni_version(jint version) { | |
3798 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
3799 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
3800 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
3801 return JNI_FALSE; | |
3802 } | |
3803 | |
3804 | |
3805 void Threads::add(JavaThread* p, bool force_daemon) { | |
3806 // The threads lock must be owned at this point | |
3807 assert_locked_or_safepoint(Threads_lock); | |
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3808 |
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3809 // See the comment for this method in thread.hpp for its purpose and |
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3810 // why it is called here. |
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|
3811 p->initialize_queues(); |
0 | 3812 p->set_next(_thread_list); |
3813 _thread_list = p; | |
3814 _number_of_threads++; | |
3815 oop threadObj = p->threadObj(); | |
3816 bool daemon = true; | |
3817 // Bootstrapping problem: threadObj can be null for initial | |
3818 // JavaThread (or for threads attached via JNI) | |
3819 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
3820 _number_of_non_daemon_threads++; | |
3821 daemon = false; | |
3822 } | |
3823 | |
3824 ThreadService::add_thread(p, daemon); | |
3825 | |
3826 // Possible GC point. | |
3827 Events::log("Thread added: " INTPTR_FORMAT, p); | |
3828 } | |
3829 | |
3830 void Threads::remove(JavaThread* p) { | |
3831 // Extra scope needed for Thread_lock, so we can check | |
3832 // that we do not remove thread without safepoint code notice | |
3833 { MutexLocker ml(Threads_lock); | |
3834 | |
3835 assert(includes(p), "p must be present"); | |
3836 | |
3837 JavaThread* current = _thread_list; | |
3838 JavaThread* prev = NULL; | |
3839 | |
3840 while (current != p) { | |
3841 prev = current; | |
3842 current = current->next(); | |
3843 } | |
3844 | |
3845 if (prev) { | |
3846 prev->set_next(current->next()); | |
3847 } else { | |
3848 _thread_list = p->next(); | |
3849 } | |
3850 _number_of_threads--; | |
3851 oop threadObj = p->threadObj(); | |
3852 bool daemon = true; | |
3853 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
3854 _number_of_non_daemon_threads--; | |
3855 daemon = false; | |
3856 | |
3857 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
3858 // on destroy_vm will wake up. | |
3859 if (number_of_non_daemon_threads() == 1) | |
3860 Threads_lock->notify_all(); | |
3861 } | |
3862 ThreadService::remove_thread(p, daemon); | |
3863 | |
3864 // Make sure that safepoint code disregard this thread. This is needed since | |
3865 // the thread might mess around with locks after this point. This can cause it | |
3866 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
3867 // of this thread since it is removed from the queue. | |
3868 p->set_terminated_value(); | |
3869 } // unlock Threads_lock | |
3870 | |
3871 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
3872 Events::log("Thread exited: " INTPTR_FORMAT, p); | |
3873 } | |
3874 | |
3875 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
3876 bool Threads::includes(JavaThread* p) { | |
3877 assert(Threads_lock->is_locked(), "sanity check"); | |
3878 ALL_JAVA_THREADS(q) { | |
3879 if (q == p ) { | |
3880 return true; | |
3881 } | |
3882 } | |
3883 return false; | |
3884 } | |
3885 | |
3886 // Operations on the Threads list for GC. These are not explicitly locked, | |
3887 // but the garbage collector must provide a safe context for them to run. | |
3888 // In particular, these things should never be called when the Threads_lock | |
3889 // is held by some other thread. (Note: the Safepoint abstraction also | |
3890 // uses the Threads_lock to gurantee this property. It also makes sure that | |
3891 // all threads gets blocked when exiting or starting). | |
3892 | |
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3893 void Threads::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 3894 ALL_JAVA_THREADS(p) { |
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3895 p->oops_do(f, cf); |
0 | 3896 } |
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3897 VMThread::vm_thread()->oops_do(f, cf); |
0 | 3898 } |
3899 | |
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3900 void Threads::possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 3901 // Introduce a mechanism allowing parallel threads to claim threads as |
3902 // root groups. Overhead should be small enough to use all the time, | |
3903 // even in sequential code. | |
3904 SharedHeap* sh = SharedHeap::heap(); | |
3905 bool is_par = (sh->n_par_threads() > 0); | |
3906 int cp = SharedHeap::heap()->strong_roots_parity(); | |
3907 ALL_JAVA_THREADS(p) { | |
3908 if (p->claim_oops_do(is_par, cp)) { | |
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3909 p->oops_do(f, cf); |
0 | 3910 } |
3911 } | |
3912 VMThread* vmt = VMThread::vm_thread(); | |
3979
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3913 if (vmt->claim_oops_do(is_par, cp)) { |
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3914 vmt->oops_do(f, cf); |
3979
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3915 } |
0 | 3916 } |
3917 | |
3918 #ifndef SERIALGC | |
3919 // Used by ParallelScavenge | |
3920 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
3921 ALL_JAVA_THREADS(p) { | |
3922 q->enqueue(new ThreadRootsTask(p)); | |
3923 } | |
3924 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
3925 } | |
3926 | |
3927 // Used by Parallel Old | |
3928 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
3929 ALL_JAVA_THREADS(p) { | |
3930 q->enqueue(new ThreadRootsMarkingTask(p)); | |
3931 } | |
3932 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
3933 } | |
3934 #endif // SERIALGC | |
3935 | |
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3936 void Threads::nmethods_do(CodeBlobClosure* cf) { |
0 | 3937 ALL_JAVA_THREADS(p) { |
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3938 p->nmethods_do(cf); |
0 | 3939 } |
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3940 VMThread::vm_thread()->nmethods_do(cf); |
0 | 3941 } |
3942 | |
3943 void Threads::gc_epilogue() { | |
3944 ALL_JAVA_THREADS(p) { | |
3945 p->gc_epilogue(); | |
3946 } | |
3947 } | |
3948 | |
3949 void Threads::gc_prologue() { | |
3950 ALL_JAVA_THREADS(p) { | |
3951 p->gc_prologue(); | |
3952 } | |
3953 } | |
3954 | |
3955 void Threads::deoptimized_wrt_marked_nmethods() { | |
3956 ALL_JAVA_THREADS(p) { | |
3957 p->deoptimized_wrt_marked_nmethods(); | |
3958 } | |
3959 } | |
3960 | |
3961 | |
3962 // Get count Java threads that are waiting to enter the specified monitor. | |
3963 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
3964 address monitor, bool doLock) { | |
3965 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
3966 "must grab Threads_lock or be at safepoint"); | |
3967 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
3968 | |
3969 int i = 0; | |
3970 { | |
3971 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
3972 ALL_JAVA_THREADS(p) { | |
3973 if (p->is_Compiler_thread()) continue; | |
3974 | |
3975 address pending = (address)p->current_pending_monitor(); | |
3976 if (pending == monitor) { // found a match | |
3977 if (i < count) result->append(p); // save the first count matches | |
3978 i++; | |
3979 } | |
3980 } | |
3981 } | |
3982 return result; | |
3983 } | |
3984 | |
3985 | |
3986 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
3987 assert(doLock || | |
3988 Threads_lock->owned_by_self() || | |
3989 SafepointSynchronize::is_at_safepoint(), | |
3990 "must grab Threads_lock or be at safepoint"); | |
3991 | |
3992 // NULL owner means not locked so we can skip the search | |
3993 if (owner == NULL) return NULL; | |
3994 | |
3995 { | |
3996 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
3997 ALL_JAVA_THREADS(p) { | |
3998 // first, see if owner is the address of a Java thread | |
3999 if (owner == (address)p) return p; | |
4000 } | |
4001 } | |
4002 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
4003 if (UseHeavyMonitors) return NULL; | |
4004 | |
4005 // | |
4006 // If we didn't find a matching Java thread and we didn't force use of | |
4007 // heavyweight monitors, then the owner is the stack address of the | |
4008 // Lock Word in the owning Java thread's stack. | |
4009 // | |
4010 JavaThread* the_owner = NULL; | |
4011 { | |
4012 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4013 ALL_JAVA_THREADS(q) { | |
702
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4014 if (q->is_lock_owned(owner)) { |
0 | 4015 the_owner = q; |
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4016 break; |
0 | 4017 } |
4018 } | |
4019 } | |
4020 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
4021 return the_owner; | |
4022 } | |
4023 | |
4024 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
4025 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
4026 char buf[32]; | |
4027 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
4028 | |
4029 st->print_cr("Full thread dump %s (%s %s):", | |
4030 Abstract_VM_Version::vm_name(), | |
4031 Abstract_VM_Version::vm_release(), | |
4032 Abstract_VM_Version::vm_info_string() | |
4033 ); | |
4034 st->cr(); | |
4035 | |
4036 #ifndef SERIALGC | |
4037 // Dump concurrent locks | |
4038 ConcurrentLocksDump concurrent_locks; | |
4039 if (print_concurrent_locks) { | |
4040 concurrent_locks.dump_at_safepoint(); | |
4041 } | |
4042 #endif // SERIALGC | |
4043 | |
4044 ALL_JAVA_THREADS(p) { | |
4045 ResourceMark rm; | |
4046 p->print_on(st); | |
4047 if (print_stacks) { | |
4048 if (internal_format) { | |
4049 p->trace_stack(); | |
4050 } else { | |
4051 p->print_stack_on(st); | |
4052 } | |
4053 } | |
4054 st->cr(); | |
4055 #ifndef SERIALGC | |
4056 if (print_concurrent_locks) { | |
4057 concurrent_locks.print_locks_on(p, st); | |
4058 } | |
4059 #endif // SERIALGC | |
4060 } | |
4061 | |
4062 VMThread::vm_thread()->print_on(st); | |
4063 st->cr(); | |
4064 Universe::heap()->print_gc_threads_on(st); | |
4065 WatcherThread* wt = WatcherThread::watcher_thread(); | |
4066 if (wt != NULL) wt->print_on(st); | |
4067 st->cr(); | |
4068 CompileBroker::print_compiler_threads_on(st); | |
4069 st->flush(); | |
4070 } | |
4071 | |
4072 // Threads::print_on_error() is called by fatal error handler. It's possible | |
4073 // that VM is not at safepoint and/or current thread is inside signal handler. | |
4074 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
4075 // memory (even in resource area), it might deadlock the error handler. | |
4076 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
4077 bool found_current = false; | |
4078 st->print_cr("Java Threads: ( => current thread )"); | |
4079 ALL_JAVA_THREADS(thread) { | |
4080 bool is_current = (current == thread); | |
4081 found_current = found_current || is_current; | |
4082 | |
4083 st->print("%s", is_current ? "=>" : " "); | |
4084 | |
4085 st->print(PTR_FORMAT, thread); | |
4086 st->print(" "); | |
4087 thread->print_on_error(st, buf, buflen); | |
4088 st->cr(); | |
4089 } | |
4090 st->cr(); | |
4091 | |
4092 st->print_cr("Other Threads:"); | |
4093 if (VMThread::vm_thread()) { | |
4094 bool is_current = (current == VMThread::vm_thread()); | |
4095 found_current = found_current || is_current; | |
4096 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
4097 | |
4098 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
4099 st->print(" "); | |
4100 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
4101 st->cr(); | |
4102 } | |
4103 WatcherThread* wt = WatcherThread::watcher_thread(); | |
4104 if (wt != NULL) { | |
4105 bool is_current = (current == wt); | |
4106 found_current = found_current || is_current; | |
4107 st->print("%s", is_current ? "=>" : " "); | |
4108 | |
4109 st->print(PTR_FORMAT, wt); | |
4110 st->print(" "); | |
4111 wt->print_on_error(st, buf, buflen); | |
4112 st->cr(); | |
4113 } | |
4114 if (!found_current) { | |
4115 st->cr(); | |
4116 st->print("=>" PTR_FORMAT " (exited) ", current); | |
4117 current->print_on_error(st, buf, buflen); | |
4118 st->cr(); | |
4119 } | |
4120 } | |
4121 | |
1878 | 4122 // Internal SpinLock and Mutex |
4123 // Based on ParkEvent | |
4124 | |
4125 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
0 | 4126 // |
1878 | 4127 // We employ SpinLocks _only for low-contention, fixed-length |
4128 // short-duration critical sections where we're concerned | |
4129 // about native mutex_t or HotSpot Mutex:: latency. | |
4130 // The mux construct provides a spin-then-block mutual exclusion | |
4131 // mechanism. | |
4132 // | |
4133 // Testing has shown that contention on the ListLock guarding gFreeList | |
4134 // is common. If we implement ListLock as a simple SpinLock it's common | |
4135 // for the JVM to devolve to yielding with little progress. This is true | |
4136 // despite the fact that the critical sections protected by ListLock are | |
4137 // extremely short. | |
0 | 4138 // |
1878 | 4139 // TODO-FIXME: ListLock should be of type SpinLock. |
4140 // We should make this a 1st-class type, integrated into the lock | |
4141 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
4142 // should have sufficient padding to avoid false-sharing and excessive | |
4143 // cache-coherency traffic. | |
4144 | |
4145 | |
4146 typedef volatile int SpinLockT ; | |
4147 | |
4148 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
4149 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
4150 return ; // normal fast-path return | |
4151 } | |
4152 | |
4153 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
4154 TEVENT (SpinAcquire - ctx) ; | |
4155 int ctr = 0 ; | |
4156 int Yields = 0 ; | |
0 | 4157 for (;;) { |
1878 | 4158 while (*adr != 0) { |
4159 ++ctr ; | |
4160 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
4161 if (Yields > 5) { | |
4162 // Consider using a simple NakedSleep() instead. | |
4163 // Then SpinAcquire could be called by non-JVM threads | |
4164 Thread::current()->_ParkEvent->park(1) ; | |
4165 } else { | |
4166 os::NakedYield() ; | |
4167 ++Yields ; | |
4168 } | |
4169 } else { | |
4170 SpinPause() ; | |
0 | 4171 } |
1878 | 4172 } |
4173 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
0 | 4174 } |
4175 } | |
4176 | |
1878 | 4177 void Thread::SpinRelease (volatile int * adr) { |
4178 assert (*adr != 0, "invariant") ; | |
4179 OrderAccess::fence() ; // guarantee at least release consistency. | |
4180 // Roach-motel semantics. | |
4181 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
4182 // but prior LDs and STs within the critical section can't be allowed | |
4183 // to reorder or float past the ST that releases the lock. | |
4184 *adr = 0 ; | |
0 | 4185 } |
4186 | |
1878 | 4187 // muxAcquire and muxRelease: |
4188 // | |
4189 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
4190 // The LSB of the word is set IFF the lock is held. | |
4191 // The remainder of the word points to the head of a singly-linked list | |
4192 // of threads blocked on the lock. | |
4193 // | |
4194 // * The current implementation of muxAcquire-muxRelease uses its own | |
4195 // dedicated Thread._MuxEvent instance. If we're interested in | |
4196 // minimizing the peak number of extant ParkEvent instances then | |
4197 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
4198 // as certain invariants were satisfied. Specifically, care would need | |
4199 // to be taken with regards to consuming unpark() "permits". | |
4200 // A safe rule of thumb is that a thread would never call muxAcquire() | |
4201 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
4202 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
4203 // consume an unpark() permit intended for monitorenter, for instance. | |
4204 // One way around this would be to widen the restricted-range semaphore | |
4205 // implemented in park(). Another alternative would be to provide | |
4206 // multiple instances of the PlatformEvent() for each thread. One | |
4207 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
4208 // | |
4209 // * Usage: | |
4210 // -- Only as leaf locks | |
4211 // -- for short-term locking only as muxAcquire does not perform | |
4212 // thread state transitions. | |
4213 // | |
4214 // Alternatives: | |
4215 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
4216 // but with parking or spin-then-park instead of pure spinning. | |
4217 // * Use Taura-Oyama-Yonenzawa locks. | |
4218 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
4219 // (List,LockByte). Acquire will CAS the full lockword while Release | |
4220 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
4221 // acquiring threads use timers (ParkTimed) to detect and recover from | |
4222 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
4223 // boundaries by using placement-new. | |
4224 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
4225 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
4226 // The validity of the backlinks must be ratified before we trust the value. | |
4227 // If the backlinks are invalid the exiting thread must back-track through the | |
4228 // the forward links, which are always trustworthy. | |
4229 // * Add a successor indication. The LockWord is currently encoded as | |
4230 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
4231 // to provide the usual futile-wakeup optimization. | |
4232 // See RTStt for details. | |
4233 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
4234 // | |
4235 | |
4236 | |
4237 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
4238 enum MuxBits { LOCKBIT = 1 } ; | |
4239 | |
4240 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
4241 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4242 if (w == 0) return ; | |
4243 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4244 return ; | |
4245 } | |
4246 | |
4247 TEVENT (muxAcquire - Contention) ; | |
4248 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
4249 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
0 | 4250 for (;;) { |
1878 | 4251 int its = (os::is_MP() ? 100 : 0) + 1 ; |
4252 | |
4253 // Optional spin phase: spin-then-park strategy | |
4254 while (--its >= 0) { | |
4255 w = *Lock ; | |
4256 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4257 return ; | |
4258 } | |
4259 } | |
4260 | |
4261 Self->reset() ; | |
4262 Self->OnList = intptr_t(Lock) ; | |
4263 // The following fence() isn't _strictly necessary as the subsequent | |
4264 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4265 OrderAccess::fence(); | |
4266 for (;;) { | |
4267 w = *Lock ; | |
4268 if ((w & LOCKBIT) == 0) { | |
4269 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4270 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
4271 return ; | |
4272 } | |
4273 continue ; // Interference -- *Lock changed -- Just retry | |
0 | 4274 } |
1878 | 4275 assert (w & LOCKBIT, "invariant") ; |
4276 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4277 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
4278 } | |
4279 | |
4280 while (Self->OnList != 0) { | |
4281 Self->park() ; | |
4282 } | |
0 | 4283 } |
4284 } | |
4285 | |
1878 | 4286 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
4287 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4288 if (w == 0) return ; | |
4289 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4290 return ; | |
4291 } | |
4292 | |
4293 TEVENT (muxAcquire - Contention) ; | |
4294 ParkEvent * ReleaseAfter = NULL ; | |
4295 if (ev == NULL) { | |
4296 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
4297 } | |
4298 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
4299 for (;;) { | |
4300 guarantee (ev->OnList == 0, "invariant") ; | |
4301 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
4302 | |
4303 // Optional spin phase: spin-then-park strategy | |
4304 while (--its >= 0) { | |
4305 w = *Lock ; | |
4306 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4307 if (ReleaseAfter != NULL) { | |
4308 ParkEvent::Release (ReleaseAfter) ; | |
4309 } | |
4310 return ; | |
4311 } | |
4312 } | |
4313 | |
4314 ev->reset() ; | |
4315 ev->OnList = intptr_t(Lock) ; | |
4316 // The following fence() isn't _strictly necessary as the subsequent | |
4317 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4318 OrderAccess::fence(); | |
4319 for (;;) { | |
4320 w = *Lock ; | |
4321 if ((w & LOCKBIT) == 0) { | |
4322 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4323 ev->OnList = 0 ; | |
4324 // We call ::Release while holding the outer lock, thus | |
4325 // artificially lengthening the critical section. | |
4326 // Consider deferring the ::Release() until the subsequent unlock(), | |
4327 // after we've dropped the outer lock. | |
4328 if (ReleaseAfter != NULL) { | |
4329 ParkEvent::Release (ReleaseAfter) ; | |
4330 } | |
4331 return ; | |
4332 } | |
4333 continue ; // Interference -- *Lock changed -- Just retry | |
4334 } | |
4335 assert (w & LOCKBIT, "invariant") ; | |
4336 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4337 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
4338 } | |
4339 | |
4340 while (ev->OnList != 0) { | |
4341 ev->park() ; | |
4342 } | |
4343 } | |
4344 } | |
4345 | |
4346 // Release() must extract a successor from the list and then wake that thread. | |
4347 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
4348 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
4349 // Release() would : | |
4350 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
4351 // (B) Extract a successor from the private list "in-hand" | |
4352 // (C) attempt to CAS() the residual back into *Lock over null. | |
4353 // If there were any newly arrived threads and the CAS() would fail. | |
4354 // In that case Release() would detach the RATs, re-merge the list in-hand | |
4355 // with the RATs and repeat as needed. Alternately, Release() might | |
4356 // detach and extract a successor, but then pass the residual list to the wakee. | |
4357 // The wakee would be responsible for reattaching and remerging before it | |
4358 // competed for the lock. | |
4359 // | |
4360 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
4361 // multiple concurrent pushers, but only one popper or detacher. | |
4362 // This implementation pops from the head of the list. This is unfair, | |
4363 // but tends to provide excellent throughput as hot threads remain hot. | |
4364 // (We wake recently run threads first). | |
4365 | |
4366 void Thread::muxRelease (volatile intptr_t * Lock) { | |
4367 for (;;) { | |
4368 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
4369 assert (w & LOCKBIT, "invariant") ; | |
4370 if (w == LOCKBIT) return ; | |
4371 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
4372 assert (List != NULL, "invariant") ; | |
4373 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
4374 ParkEvent * nxt = List->ListNext ; | |
4375 | |
4376 // The following CAS() releases the lock and pops the head element. | |
4377 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
4378 continue ; | |
4379 } | |
4380 List->OnList = 0 ; | |
4381 OrderAccess::fence() ; | |
4382 List->unpark () ; | |
4383 return ; | |
4384 } | |
4385 } | |
4386 | |
4387 | |
0 | 4388 void Threads::verify() { |
4389 ALL_JAVA_THREADS(p) { | |
4390 p->verify(); | |
4391 } | |
4392 VMThread* thread = VMThread::vm_thread(); | |
4393 if (thread != NULL) thread->verify(); | |
4394 } |