Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.cpp @ 4872:aa3d708d67c4
7141200: log some interesting information in ring buffers for crashes
Reviewed-by: kvn, jrose, kevinw, brutisso, twisti, jmasa
author | never |
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date | Wed, 01 Feb 2012 07:59:01 -0800 |
parents | 94ec88ca68e2 |
children | 0382d2b469b2 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, 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" | |
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76 #include "trace/traceEventTypes.hpp" |
1972 | 77 #include "utilities/defaultStream.hpp" |
78 #include "utilities/dtrace.hpp" | |
79 #include "utilities/events.hpp" | |
80 #include "utilities/preserveException.hpp" | |
81 #ifdef TARGET_OS_FAMILY_linux | |
82 # include "os_linux.inline.hpp" | |
83 # include "thread_linux.inline.hpp" | |
84 #endif | |
85 #ifdef TARGET_OS_FAMILY_solaris | |
86 # include "os_solaris.inline.hpp" | |
87 # include "thread_solaris.inline.hpp" | |
88 #endif | |
89 #ifdef TARGET_OS_FAMILY_windows | |
90 # include "os_windows.inline.hpp" | |
91 # include "thread_windows.inline.hpp" | |
92 #endif | |
3960 | 93 #ifdef TARGET_OS_FAMILY_bsd |
94 # include "os_bsd.inline.hpp" | |
95 # include "thread_bsd.inline.hpp" | |
96 #endif | |
1972 | 97 #ifndef SERIALGC |
98 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
99 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
100 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
101 #endif | |
102 #ifdef COMPILER1 | |
103 #include "c1/c1_Compiler.hpp" | |
104 #endif | |
105 #ifdef COMPILER2 | |
106 #include "opto/c2compiler.hpp" | |
107 #include "opto/idealGraphPrinter.hpp" | |
108 #endif | |
0 | 109 |
110 #ifdef DTRACE_ENABLED | |
111 | |
112 // Only bother with this argument setup if dtrace is available | |
113 | |
4006 | 114 #ifndef USDT2 |
0 | 115 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); |
116 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
117 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
118 intptr_t, intptr_t, bool); | |
119 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
120 intptr_t, intptr_t, bool); | |
121 | |
122 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
123 { \ | |
124 ResourceMark rm(this); \ | |
125 int len = 0; \ | |
126 const char* name = (javathread)->get_thread_name(); \ | |
127 len = strlen(name); \ | |
128 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
129 name, len, \ | |
130 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
131 (javathread)->osthread()->thread_id(), \ | |
132 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
133 } | |
134 | |
4006 | 135 #else /* USDT2 */ |
136 | |
137 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_PROBE_START | |
138 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_PROBE_STOP | |
139 | |
140 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
141 { \ | |
142 ResourceMark rm(this); \ | |
143 int len = 0; \ | |
144 const char* name = (javathread)->get_thread_name(); \ | |
145 len = strlen(name); \ | |
146 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \ | |
147 (char *) name, len, \ | |
148 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
149 (uintptr_t) (javathread)->osthread()->thread_id(), \ | |
150 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
151 } | |
152 | |
153 #endif /* USDT2 */ | |
154 | |
0 | 155 #else // ndef DTRACE_ENABLED |
156 | |
157 #define DTRACE_THREAD_PROBE(probe, javathread) | |
158 | |
159 #endif // ndef DTRACE_ENABLED | |
160 | |
161 // Class hierarchy | |
162 // - Thread | |
163 // - VMThread | |
164 // - WatcherThread | |
165 // - ConcurrentMarkSweepThread | |
166 // - JavaThread | |
167 // - CompilerThread | |
168 | |
169 // ======= Thread ======== | |
170 | |
171 // Support for forcing alignment of thread objects for biased locking | |
172 void* Thread::operator new(size_t size) { | |
173 if (UseBiasedLocking) { | |
174 const int alignment = markOopDesc::biased_lock_alignment; | |
175 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
176 void* real_malloc_addr = CHeapObj::operator new(aligned_size); | |
177 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); | |
178 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
179 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
180 "JavaThread alignment code overflowed allocated storage"); | |
181 if (TraceBiasedLocking) { | |
182 if (aligned_addr != real_malloc_addr) | |
183 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
184 real_malloc_addr, aligned_addr); | |
185 } | |
186 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
187 return aligned_addr; | |
188 } else { | |
189 return CHeapObj::operator new(size); | |
190 } | |
191 } | |
192 | |
193 void Thread::operator delete(void* p) { | |
194 if (UseBiasedLocking) { | |
195 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
196 CHeapObj::operator delete(real_malloc_addr); | |
197 } else { | |
198 CHeapObj::operator delete(p); | |
199 } | |
200 } | |
201 | |
202 | |
203 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
204 // JavaThread | |
205 | |
206 | |
207 Thread::Thread() { | |
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208 // stack and get_thread |
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209 set_stack_base(NULL); |
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210 set_stack_size(0); |
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211 set_self_raw_id(0); |
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212 set_lgrp_id(-1); |
0 | 213 |
214 // allocated data structures | |
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215 set_osthread(NULL); |
0 | 216 set_resource_area(new ResourceArea()); |
217 set_handle_area(new HandleArea(NULL)); | |
218 set_active_handles(NULL); | |
219 set_free_handle_block(NULL); | |
220 set_last_handle_mark(NULL); | |
221 | |
222 // This initial value ==> never claimed. | |
223 _oops_do_parity = 0; | |
224 | |
225 // the handle mark links itself to last_handle_mark | |
226 new HandleMark(this); | |
227 | |
228 // plain initialization | |
229 debug_only(_owned_locks = NULL;) | |
230 debug_only(_allow_allocation_count = 0;) | |
231 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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232 NOT_PRODUCT(_skip_gcalot = false;) |
0 | 233 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
234 _jvmti_env_iteration_count = 0; | |
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235 set_allocated_bytes(0); |
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236 set_trace_buffer(NULL); |
0 | 237 _vm_operation_started_count = 0; |
238 _vm_operation_completed_count = 0; | |
239 _current_pending_monitor = NULL; | |
240 _current_pending_monitor_is_from_java = true; | |
241 _current_waiting_monitor = NULL; | |
242 _num_nested_signal = 0; | |
243 omFreeList = NULL ; | |
244 omFreeCount = 0 ; | |
245 omFreeProvision = 32 ; | |
1587 | 246 omInUseList = NULL ; |
247 omInUseCount = 0 ; | |
0 | 248 |
249 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); | |
250 _suspend_flags = 0; | |
251 | |
252 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
253 _hashStateX = os::random() ; | |
254 _hashStateY = 842502087 ; | |
255 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
256 _hashStateW = 273326509 ; | |
257 | |
258 _OnTrap = 0 ; | |
259 _schedctl = NULL ; | |
260 _Stalled = 0 ; | |
261 _TypeTag = 0x2BAD ; | |
262 | |
263 // Many of the following fields are effectively final - immutable | |
264 // Note that nascent threads can't use the Native Monitor-Mutex | |
265 // construct until the _MutexEvent is initialized ... | |
266 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
267 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
268 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
269 // and ::Release() | |
270 _ParkEvent = ParkEvent::Allocate (this) ; | |
271 _SleepEvent = ParkEvent::Allocate (this) ; | |
272 _MutexEvent = ParkEvent::Allocate (this) ; | |
273 _MuxEvent = ParkEvent::Allocate (this) ; | |
274 | |
275 #ifdef CHECK_UNHANDLED_OOPS | |
276 if (CheckUnhandledOops) { | |
277 _unhandled_oops = new UnhandledOops(this); | |
278 } | |
279 #endif // CHECK_UNHANDLED_OOPS | |
280 #ifdef ASSERT | |
281 if (UseBiasedLocking) { | |
282 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
283 assert(this == _real_malloc_address || | |
284 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
285 "bug in forced alignment of thread objects"); | |
286 } | |
287 #endif /* ASSERT */ | |
288 } | |
289 | |
290 void Thread::initialize_thread_local_storage() { | |
291 // Note: Make sure this method only calls | |
292 // non-blocking operations. Otherwise, it might not work | |
293 // with the thread-startup/safepoint interaction. | |
294 | |
295 // During Java thread startup, safepoint code should allow this | |
296 // method to complete because it may need to allocate memory to | |
297 // store information for the new thread. | |
298 | |
299 // initialize structure dependent on thread local storage | |
300 ThreadLocalStorage::set_thread(this); | |
301 | |
302 // set up any platform-specific state. | |
303 os::initialize_thread(); | |
304 | |
305 } | |
306 | |
307 void Thread::record_stack_base_and_size() { | |
308 set_stack_base(os::current_stack_base()); | |
309 set_stack_size(os::current_stack_size()); | |
310 } | |
311 | |
312 | |
313 Thread::~Thread() { | |
314 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
315 ObjectSynchronizer::omFlush (this) ; | |
316 | |
317 // deallocate data structures | |
318 delete resource_area(); | |
319 // since the handle marks are using the handle area, we have to deallocated the root | |
320 // handle mark before deallocating the thread's handle area, | |
321 assert(last_handle_mark() != NULL, "check we have an element"); | |
322 delete last_handle_mark(); | |
323 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
324 | |
325 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
326 // We NULL out the fields for good hygiene. | |
327 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
328 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
329 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
330 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
331 | |
332 delete handle_area(); | |
333 | |
334 // osthread() can be NULL, if creation of thread failed. | |
335 if (osthread() != NULL) os::free_thread(osthread()); | |
336 | |
337 delete _SR_lock; | |
338 | |
339 // clear thread local storage if the Thread is deleting itself | |
340 if (this == Thread::current()) { | |
341 ThreadLocalStorage::set_thread(NULL); | |
342 } else { | |
343 // In the case where we're not the current thread, invalidate all the | |
344 // caches in case some code tries to get the current thread or the | |
345 // thread that was destroyed, and gets stale information. | |
346 ThreadLocalStorage::invalidate_all(); | |
347 } | |
348 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
349 } | |
350 | |
351 // NOTE: dummy function for assertion purpose. | |
352 void Thread::run() { | |
353 ShouldNotReachHere(); | |
354 } | |
355 | |
356 #ifdef ASSERT | |
357 // Private method to check for dangling thread pointer | |
358 void check_for_dangling_thread_pointer(Thread *thread) { | |
359 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
360 "possibility of dangling Thread pointer"); | |
361 } | |
362 #endif | |
363 | |
364 | |
365 #ifndef PRODUCT | |
366 // Tracing method for basic thread operations | |
367 void Thread::trace(const char* msg, const Thread* const thread) { | |
368 if (!TraceThreadEvents) return; | |
369 ResourceMark rm; | |
370 ThreadCritical tc; | |
371 const char *name = "non-Java thread"; | |
372 int prio = -1; | |
373 if (thread->is_Java_thread() | |
374 && !thread->is_Compiler_thread()) { | |
375 // The Threads_lock must be held to get information about | |
376 // this thread but may not be in some situations when | |
377 // tracing thread events. | |
378 bool release_Threads_lock = false; | |
379 if (!Threads_lock->owned_by_self()) { | |
380 Threads_lock->lock(); | |
381 release_Threads_lock = true; | |
382 } | |
383 JavaThread* jt = (JavaThread *)thread; | |
384 name = (char *)jt->get_thread_name(); | |
385 oop thread_oop = jt->threadObj(); | |
386 if (thread_oop != NULL) { | |
387 prio = java_lang_Thread::priority(thread_oop); | |
388 } | |
389 if (release_Threads_lock) { | |
390 Threads_lock->unlock(); | |
391 } | |
392 } | |
393 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
394 } | |
395 #endif | |
396 | |
397 | |
398 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
399 trace("get priority", thread); | |
400 ThreadPriority priority; | |
401 // Can return an error! | |
402 (void)os::get_priority(thread, priority); | |
403 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
404 return priority; | |
405 } | |
406 | |
407 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
408 trace("set priority", thread); | |
409 debug_only(check_for_dangling_thread_pointer(thread);) | |
410 // Can return an error! | |
411 (void)os::set_priority(thread, priority); | |
412 } | |
413 | |
414 | |
415 void Thread::start(Thread* thread) { | |
416 trace("start", thread); | |
417 // Start is different from resume in that its safety is guaranteed by context or | |
418 // being called from a Java method synchronized on the Thread object. | |
419 if (!DisableStartThread) { | |
420 if (thread->is_Java_thread()) { | |
421 // Initialize the thread state to RUNNABLE before starting this thread. | |
422 // Can not set it after the thread started because we do not know the | |
423 // exact thread state at that time. It could be in MONITOR_WAIT or | |
424 // in SLEEPING or some other state. | |
425 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
426 java_lang_Thread::RUNNABLE); | |
427 } | |
428 os::start_thread(thread); | |
429 } | |
430 } | |
431 | |
432 // Enqueue a VM_Operation to do the job for us - sometime later | |
433 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
434 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
435 VMThread::execute(vm_stop); | |
436 } | |
437 | |
438 | |
439 // | |
440 // Check if an external suspend request has completed (or has been | |
441 // cancelled). Returns true if the thread is externally suspended and | |
442 // false otherwise. | |
443 // | |
444 // The bits parameter returns information about the code path through | |
445 // the routine. Useful for debugging: | |
446 // | |
447 // set in is_ext_suspend_completed(): | |
448 // 0x00000001 - routine was entered | |
449 // 0x00000010 - routine return false at end | |
450 // 0x00000100 - thread exited (return false) | |
451 // 0x00000200 - suspend request cancelled (return false) | |
452 // 0x00000400 - thread suspended (return true) | |
453 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
454 // 0x00002000 - thread is native and walkable (return true) | |
455 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
456 // | |
457 // set in wait_for_ext_suspend_completion(): | |
458 // 0x00010000 - routine was entered | |
459 // 0x00020000 - suspend request cancelled before loop (return false) | |
460 // 0x00040000 - thread suspended before loop (return true) | |
461 // 0x00080000 - suspend request cancelled in loop (return false) | |
462 // 0x00100000 - thread suspended in loop (return true) | |
463 // 0x00200000 - suspend not completed during retry loop (return false) | |
464 // | |
465 | |
466 // Helper class for tracing suspend wait debug bits. | |
467 // | |
468 // 0x00000100 indicates that the target thread exited before it could | |
469 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
470 // 0x00080000 each indicate a cancelled suspend request so they don't | |
471 // count as wait failures either. | |
472 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
473 | |
474 class TraceSuspendDebugBits : public StackObj { | |
475 private: | |
476 JavaThread * jt; | |
477 bool is_wait; | |
478 bool called_by_wait; // meaningful when !is_wait | |
479 uint32_t * bits; | |
480 | |
481 public: | |
482 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
483 uint32_t *_bits) { | |
484 jt = _jt; | |
485 is_wait = _is_wait; | |
486 called_by_wait = _called_by_wait; | |
487 bits = _bits; | |
488 } | |
489 | |
490 ~TraceSuspendDebugBits() { | |
491 if (!is_wait) { | |
492 #if 1 | |
493 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
494 // That trace is very chatty. | |
495 return; | |
496 #else | |
497 if (!called_by_wait) { | |
498 // If tracing for is_ext_suspend_completed() is enabled, then only | |
499 // trace calls to it from wait_for_ext_suspend_completion() | |
500 return; | |
501 } | |
502 #endif | |
503 } | |
504 | |
505 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
506 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
507 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
508 ResourceMark rm; | |
509 | |
510 tty->print_cr( | |
511 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
512 jt->get_thread_name(), *bits); | |
513 | |
514 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
515 } | |
516 } | |
517 } | |
518 }; | |
519 #undef DEBUG_FALSE_BITS | |
520 | |
521 | |
522 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
523 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
524 | |
525 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
526 bool do_trans_retry; // flag to force the retry | |
527 | |
528 *bits |= 0x00000001; | |
529 | |
530 do { | |
531 do_trans_retry = false; | |
532 | |
533 if (is_exiting()) { | |
534 // Thread is in the process of exiting. This is always checked | |
535 // first to reduce the risk of dereferencing a freed JavaThread. | |
536 *bits |= 0x00000100; | |
537 return false; | |
538 } | |
539 | |
540 if (!is_external_suspend()) { | |
541 // Suspend request is cancelled. This is always checked before | |
542 // is_ext_suspended() to reduce the risk of a rogue resume | |
543 // confusing the thread that made the suspend request. | |
544 *bits |= 0x00000200; | |
545 return false; | |
546 } | |
547 | |
548 if (is_ext_suspended()) { | |
549 // thread is suspended | |
550 *bits |= 0x00000400; | |
551 return true; | |
552 } | |
553 | |
554 // Now that we no longer do hard suspends of threads running | |
555 // native code, the target thread can be changing thread state | |
556 // while we are in this routine: | |
557 // | |
558 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
559 // | |
560 // We save a copy of the thread state as observed at this moment | |
561 // and make our decision about suspend completeness based on the | |
562 // copy. This closes the race where the thread state is seen as | |
563 // _thread_in_native_trans in the if-thread_blocked check, but is | |
564 // seen as _thread_blocked in if-thread_in_native_trans check. | |
565 JavaThreadState save_state = thread_state(); | |
566 | |
567 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
568 // If the thread's state is _thread_blocked and this blocking | |
569 // condition is known to be equivalent to a suspend, then we can | |
570 // consider the thread to be externally suspended. This means that | |
571 // the code that sets _thread_blocked has been modified to do | |
572 // self-suspension if the blocking condition releases. We also | |
573 // used to check for CONDVAR_WAIT here, but that is now covered by | |
574 // the _thread_blocked with self-suspension check. | |
575 // | |
576 // Return true since we wouldn't be here unless there was still an | |
577 // external suspend request. | |
578 *bits |= 0x00001000; | |
579 return true; | |
580 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
581 // Threads running native code will self-suspend on native==>VM/Java | |
582 // transitions. If its stack is walkable (should always be the case | |
583 // unless this function is called before the actual java_suspend() | |
584 // call), then the wait is done. | |
585 *bits |= 0x00002000; | |
586 return true; | |
587 } else if (!called_by_wait && !did_trans_retry && | |
588 save_state == _thread_in_native_trans && | |
589 frame_anchor()->walkable()) { | |
590 // The thread is transitioning from thread_in_native to another | |
591 // thread state. check_safepoint_and_suspend_for_native_trans() | |
592 // will force the thread to self-suspend. If it hasn't gotten | |
593 // there yet we may have caught the thread in-between the native | |
594 // code check above and the self-suspend. Lucky us. If we were | |
595 // called by wait_for_ext_suspend_completion(), then it | |
596 // will be doing the retries so we don't have to. | |
597 // | |
598 // Since we use the saved thread state in the if-statement above, | |
599 // there is a chance that the thread has already transitioned to | |
600 // _thread_blocked by the time we get here. In that case, we will | |
601 // make a single unnecessary pass through the logic below. This | |
602 // doesn't hurt anything since we still do the trans retry. | |
603 | |
604 *bits |= 0x00004000; | |
605 | |
606 // Once the thread leaves thread_in_native_trans for another | |
607 // thread state, we break out of this retry loop. We shouldn't | |
608 // need this flag to prevent us from getting back here, but | |
609 // sometimes paranoia is good. | |
610 did_trans_retry = true; | |
611 | |
612 // We wait for the thread to transition to a more usable state. | |
613 for (int i = 1; i <= SuspendRetryCount; i++) { | |
614 // We used to do an "os::yield_all(i)" call here with the intention | |
615 // that yielding would increase on each retry. However, the parameter | |
616 // is ignored on Linux which means the yield didn't scale up. Waiting | |
617 // on the SR_lock below provides a much more predictable scale up for | |
618 // the delay. It also provides a simple/direct point to check for any | |
619 // safepoint requests from the VMThread | |
620 | |
621 // temporarily drops SR_lock while doing wait with safepoint check | |
622 // (if we're a JavaThread - the WatcherThread can also call this) | |
623 // and increase delay with each retry | |
624 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
625 | |
626 // check the actual thread state instead of what we saved above | |
627 if (thread_state() != _thread_in_native_trans) { | |
628 // the thread has transitioned to another thread state so | |
629 // try all the checks (except this one) one more time. | |
630 do_trans_retry = true; | |
631 break; | |
632 } | |
633 } // end retry loop | |
634 | |
635 | |
636 } | |
637 } while (do_trans_retry); | |
638 | |
639 *bits |= 0x00000010; | |
640 return false; | |
641 } | |
642 | |
643 // | |
644 // Wait for an external suspend request to complete (or be cancelled). | |
645 // Returns true if the thread is externally suspended and false otherwise. | |
646 // | |
647 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
648 uint32_t *bits) { | |
649 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
650 false /* !called_by_wait */, bits); | |
651 | |
652 // local flag copies to minimize SR_lock hold time | |
653 bool is_suspended; | |
654 bool pending; | |
655 uint32_t reset_bits; | |
656 | |
657 // set a marker so is_ext_suspend_completed() knows we are the caller | |
658 *bits |= 0x00010000; | |
659 | |
660 // We use reset_bits to reinitialize the bits value at the top of | |
661 // each retry loop. This allows the caller to make use of any | |
662 // unused bits for their own marking purposes. | |
663 reset_bits = *bits; | |
664 | |
665 { | |
666 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
667 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
668 delay, bits); | |
669 pending = is_external_suspend(); | |
670 } | |
671 // must release SR_lock to allow suspension to complete | |
672 | |
673 if (!pending) { | |
674 // A cancelled suspend request is the only false return from | |
675 // is_ext_suspend_completed() that keeps us from entering the | |
676 // retry loop. | |
677 *bits |= 0x00020000; | |
678 return false; | |
679 } | |
680 | |
681 if (is_suspended) { | |
682 *bits |= 0x00040000; | |
683 return true; | |
684 } | |
685 | |
686 for (int i = 1; i <= retries; i++) { | |
687 *bits = reset_bits; // reinit to only track last retry | |
688 | |
689 // We used to do an "os::yield_all(i)" call here with the intention | |
690 // that yielding would increase on each retry. However, the parameter | |
691 // is ignored on Linux which means the yield didn't scale up. Waiting | |
692 // on the SR_lock below provides a much more predictable scale up for | |
693 // the delay. It also provides a simple/direct point to check for any | |
694 // safepoint requests from the VMThread | |
695 | |
696 { | |
697 MutexLocker ml(SR_lock()); | |
698 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
699 // can also call this) and increase delay with each retry | |
700 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
701 | |
702 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
703 delay, bits); | |
704 | |
705 // It is possible for the external suspend request to be cancelled | |
706 // (by a resume) before the actual suspend operation is completed. | |
707 // Refresh our local copy to see if we still need to wait. | |
708 pending = is_external_suspend(); | |
709 } | |
710 | |
711 if (!pending) { | |
712 // A cancelled suspend request is the only false return from | |
713 // is_ext_suspend_completed() that keeps us from staying in the | |
714 // retry loop. | |
715 *bits |= 0x00080000; | |
716 return false; | |
717 } | |
718 | |
719 if (is_suspended) { | |
720 *bits |= 0x00100000; | |
721 return true; | |
722 } | |
723 } // end retry loop | |
724 | |
725 // thread did not suspend after all our retries | |
726 *bits |= 0x00200000; | |
727 return false; | |
728 } | |
729 | |
730 #ifndef PRODUCT | |
731 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
732 | |
733 // This should not need to be atomic as the only way for simultaneous | |
734 // updates is via interrupts. Even then this should be rare or non-existant | |
735 // and we don't care that much anyway. | |
736 | |
737 int index = _jmp_ring_index; | |
738 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
739 _jmp_ring[index]._target = (intptr_t) target; | |
740 _jmp_ring[index]._instruction = (intptr_t) instr; | |
741 _jmp_ring[index]._file = file; | |
742 _jmp_ring[index]._line = line; | |
743 } | |
744 #endif /* PRODUCT */ | |
745 | |
746 // Called by flat profiler | |
747 // Callers have already called wait_for_ext_suspend_completion | |
748 // The assertion for that is currently too complex to put here: | |
749 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
750 bool gotframe = false; | |
751 // self suspension saves needed state. | |
752 if (has_last_Java_frame() && _anchor.walkable()) { | |
753 *_fr = pd_last_frame(); | |
754 gotframe = true; | |
755 } | |
756 return gotframe; | |
757 } | |
758 | |
759 void Thread::interrupt(Thread* thread) { | |
760 trace("interrupt", thread); | |
761 debug_only(check_for_dangling_thread_pointer(thread);) | |
762 os::interrupt(thread); | |
763 } | |
764 | |
765 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
766 trace("is_interrupted", thread); | |
767 debug_only(check_for_dangling_thread_pointer(thread);) | |
768 // Note: If clear_interrupted==false, this simply fetches and | |
769 // returns the value of the field osthread()->interrupted(). | |
770 return os::is_interrupted(thread, clear_interrupted); | |
771 } | |
772 | |
773 | |
774 // GC Support | |
775 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
776 jint thread_parity = _oops_do_parity; | |
777 if (thread_parity != strong_roots_parity) { | |
778 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
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779 if (res == thread_parity) { |
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780 return true; |
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781 } else { |
0 | 782 guarantee(res == strong_roots_parity, "Or else what?"); |
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783 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
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784 "Should only fail when parallel."); |
0 | 785 return false; |
786 } | |
787 } | |
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788 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
0 | 789 "Should only fail when parallel."); |
790 return false; | |
791 } | |
792 | |
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793 void Thread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 794 active_handles()->oops_do(f); |
795 // Do oop for ThreadShadow | |
796 f->do_oop((oop*)&_pending_exception); | |
797 handle_area()->oops_do(f); | |
798 } | |
799 | |
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800 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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801 // no nmethods in a generic thread... |
0 | 802 } |
803 | |
804 void Thread::print_on(outputStream* st) const { | |
805 // get_priority assumes osthread initialized | |
806 if (osthread() != NULL) { | |
807 st->print("prio=%d tid=" INTPTR_FORMAT " ", get_priority(this), this); | |
808 osthread()->print_on(st); | |
809 } | |
810 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
811 } | |
812 | |
813 // Thread::print_on_error() is called by fatal error handler. Don't use | |
814 // any lock or allocate memory. | |
815 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
816 if (is_VM_thread()) st->print("VMThread"); | |
817 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
818 else if (is_Java_thread()) st->print("JavaThread"); | |
819 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
820 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
821 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
822 else st->print("Thread"); | |
823 | |
824 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
825 _stack_base - _stack_size, _stack_base); | |
826 | |
827 if (osthread()) { | |
828 st->print(" [id=%d]", osthread()->thread_id()); | |
829 } | |
830 } | |
831 | |
832 #ifdef ASSERT | |
833 void Thread::print_owned_locks_on(outputStream* st) const { | |
834 Monitor *cur = _owned_locks; | |
835 if (cur == NULL) { | |
836 st->print(" (no locks) "); | |
837 } else { | |
838 st->print_cr(" Locks owned:"); | |
839 while(cur) { | |
840 cur->print_on(st); | |
841 cur = cur->next(); | |
842 } | |
843 } | |
844 } | |
845 | |
846 static int ref_use_count = 0; | |
847 | |
848 bool Thread::owns_locks_but_compiled_lock() const { | |
849 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
850 if (cur != Compile_lock) return true; | |
851 } | |
852 return false; | |
853 } | |
854 | |
855 | |
856 #endif | |
857 | |
858 #ifndef PRODUCT | |
859 | |
860 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
861 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
862 // no threads which allow_vm_block's are held | |
863 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
864 // Check if current thread is allowed to block at a safepoint | |
865 if (!(_allow_safepoint_count == 0)) | |
866 fatal("Possible safepoint reached by thread that does not allow it"); | |
867 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
868 fatal("LEAF method calling lock?"); | |
869 } | |
870 | |
871 #ifdef ASSERT | |
872 if (potential_vm_operation && is_Java_thread() | |
873 && !Universe::is_bootstrapping()) { | |
874 // Make sure we do not hold any locks that the VM thread also uses. | |
875 // This could potentially lead to deadlocks | |
876 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
877 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
878 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
879 // since it is used to transfer control between JavaThreads and the VMThread | |
880 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
881 if ( (cur->allow_vm_block() && | |
882 cur != Threads_lock && | |
883 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
884 cur != VMOperationRequest_lock && | |
885 cur != VMOperationQueue_lock) || | |
886 cur->rank() == Mutex::special) { | |
887 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
888 } | |
889 } | |
890 } | |
891 | |
892 if (GCALotAtAllSafepoints) { | |
893 // We could enter a safepoint here and thus have a gc | |
894 InterfaceSupport::check_gc_alot(); | |
895 } | |
896 #endif | |
897 } | |
898 #endif | |
899 | |
900 bool Thread::is_in_stack(address adr) const { | |
901 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
902 address end = os::current_stack_pointer(); | |
903 if (stack_base() >= adr && adr >= end) return true; | |
904 | |
905 return false; | |
906 } | |
907 | |
908 | |
909 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
910 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
911 // used for compilation in the future. If that change is made, the need for these methods | |
912 // should be revisited, and they should be removed if possible. | |
913 | |
914 bool Thread::is_lock_owned(address adr) const { | |
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915 return on_local_stack(adr); |
0 | 916 } |
917 | |
918 bool Thread::set_as_starting_thread() { | |
919 // NOTE: this must be called inside the main thread. | |
920 return os::create_main_thread((JavaThread*)this); | |
921 } | |
922 | |
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923 static void initialize_class(Symbol* class_name, TRAPS) { |
0 | 924 klassOop klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
925 instanceKlass::cast(klass)->initialize(CHECK); | |
926 } | |
927 | |
928 | |
929 // Creates the initial ThreadGroup | |
930 static Handle create_initial_thread_group(TRAPS) { | |
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931 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
0 | 932 instanceKlassHandle klass (THREAD, k); |
933 | |
934 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
935 { | |
936 JavaValue result(T_VOID); | |
937 JavaCalls::call_special(&result, | |
938 system_instance, | |
939 klass, | |
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940 vmSymbols::object_initializer_name(), |
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941 vmSymbols::void_method_signature(), |
0 | 942 CHECK_NH); |
943 } | |
944 Universe::set_system_thread_group(system_instance()); | |
945 | |
946 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
947 { | |
948 JavaValue result(T_VOID); | |
949 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
950 JavaCalls::call_special(&result, | |
951 main_instance, | |
952 klass, | |
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953 vmSymbols::object_initializer_name(), |
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954 vmSymbols::threadgroup_string_void_signature(), |
0 | 955 system_instance, |
956 string, | |
957 CHECK_NH); | |
958 } | |
959 return main_instance; | |
960 } | |
961 | |
962 // Creates the initial Thread | |
963 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
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964 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
0 | 965 instanceKlassHandle klass (THREAD, k); |
966 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
967 | |
968 java_lang_Thread::set_thread(thread_oop(), thread); | |
969 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
970 thread->set_threadObj(thread_oop()); | |
971 | |
972 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
973 | |
974 JavaValue result(T_VOID); | |
975 JavaCalls::call_special(&result, thread_oop, | |
976 klass, | |
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977 vmSymbols::object_initializer_name(), |
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978 vmSymbols::threadgroup_string_void_signature(), |
0 | 979 thread_group, |
980 string, | |
981 CHECK_NULL); | |
982 return thread_oop(); | |
983 } | |
984 | |
985 static void call_initializeSystemClass(TRAPS) { | |
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986 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 987 instanceKlassHandle klass (THREAD, k); |
988 | |
989 JavaValue result(T_VOID); | |
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990 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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991 vmSymbols::void_method_signature(), CHECK); |
0 | 992 } |
993 | |
2129
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994 // General purpose hook into Java code, run once when the VM is initialized. |
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995 // The Java library method itself may be changed independently from the VM. |
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996 static void call_postVMInitHook(TRAPS) { |
3938 | 997 klassOop k = SystemDictionary::PostVMInitHook_klass(); |
2129
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998 instanceKlassHandle klass (THREAD, k); |
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999 if (klass.not_null()) { |
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1000 JavaValue result(T_VOID); |
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1001 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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1002 vmSymbols::void_method_signature(), |
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1003 CHECK); |
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1004 } |
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1005 } |
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1006 |
0 | 1007 static void reset_vm_info_property(TRAPS) { |
1008 // the vm info string | |
1009 ResourceMark rm(THREAD); | |
1010 const char *vm_info = VM_Version::vm_info_string(); | |
1011 | |
1012 // java.lang.System class | |
2177
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1013 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 1014 instanceKlassHandle klass (THREAD, k); |
1015 | |
1016 // setProperty arguments | |
1017 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
1018 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
1019 | |
1020 // return value | |
1021 JavaValue r(T_OBJECT); | |
1022 | |
1023 // public static String setProperty(String key, String value); | |
1024 JavaCalls::call_static(&r, | |
1025 klass, | |
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1026 vmSymbols::setProperty_name(), |
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1027 vmSymbols::string_string_string_signature(), |
0 | 1028 key_str, |
1029 value_str, | |
1030 CHECK); | |
1031 } | |
1032 | |
1033 | |
1034 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
1035 assert(thread_group.not_null(), "thread group should be specified"); | |
1036 assert(threadObj() == NULL, "should only create Java thread object once"); | |
1037 | |
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1038 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
0 | 1039 instanceKlassHandle klass (THREAD, k); |
1040 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
1041 | |
1042 java_lang_Thread::set_thread(thread_oop(), this); | |
1043 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1044 set_threadObj(thread_oop()); | |
1045 | |
1046 JavaValue result(T_VOID); | |
1047 if (thread_name != NULL) { | |
1048 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
1049 // Thread gets assigned specified name and null target | |
1050 JavaCalls::call_special(&result, | |
1051 thread_oop, | |
1052 klass, | |
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1053 vmSymbols::object_initializer_name(), |
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1054 vmSymbols::threadgroup_string_void_signature(), |
0 | 1055 thread_group, // Argument 1 |
1056 name, // Argument 2 | |
1057 THREAD); | |
1058 } else { | |
1059 // Thread gets assigned name "Thread-nnn" and null target | |
1060 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
1061 JavaCalls::call_special(&result, | |
1062 thread_oop, | |
1063 klass, | |
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1064 vmSymbols::object_initializer_name(), |
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1065 vmSymbols::threadgroup_runnable_void_signature(), |
0 | 1066 thread_group, // Argument 1 |
1067 Handle(), // Argument 2 | |
1068 THREAD); | |
1069 } | |
1070 | |
1071 | |
1072 if (daemon) { | |
1073 java_lang_Thread::set_daemon(thread_oop()); | |
1074 } | |
1075 | |
1076 if (HAS_PENDING_EXCEPTION) { | |
1077 return; | |
1078 } | |
1079 | |
1142 | 1080 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
0 | 1081 Handle threadObj(this, this->threadObj()); |
1082 | |
1083 JavaCalls::call_special(&result, | |
1084 thread_group, | |
1085 group, | |
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1086 vmSymbols::add_method_name(), |
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1087 vmSymbols::thread_void_signature(), |
0 | 1088 threadObj, // Arg 1 |
1089 THREAD); | |
1090 | |
1091 | |
1092 } | |
1093 | |
1094 // NamedThread -- non-JavaThread subclasses with multiple | |
1095 // uniquely named instances should derive from this. | |
1096 NamedThread::NamedThread() : Thread() { | |
1097 _name = NULL; | |
1119
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1098 _processed_thread = NULL; |
0 | 1099 } |
1100 | |
1101 NamedThread::~NamedThread() { | |
1102 if (_name != NULL) { | |
1103 FREE_C_HEAP_ARRAY(char, _name); | |
1104 _name = NULL; | |
1105 } | |
1106 } | |
1107 | |
1108 void NamedThread::set_name(const char* format, ...) { | |
1109 guarantee(_name == NULL, "Only get to set name once."); | |
1110 _name = NEW_C_HEAP_ARRAY(char, max_name_len); | |
1111 guarantee(_name != NULL, "alloc failure"); | |
1112 va_list ap; | |
1113 va_start(ap, format); | |
1114 jio_vsnprintf(_name, max_name_len, format, ap); | |
1115 va_end(ap); | |
1116 } | |
1117 | |
1118 // ======= WatcherThread ======== | |
1119 | |
1120 // The watcher thread exists to simulate timer interrupts. It should | |
1121 // be replaced by an abstraction over whatever native support for | |
1122 // timer interrupts exists on the platform. | |
1123 | |
1124 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
1681
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1125 volatile bool WatcherThread::_should_terminate = false; |
0 | 1126 |
1127 WatcherThread::WatcherThread() : Thread() { | |
1128 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
1129 if (os::create_thread(this, os::watcher_thread)) { | |
1130 _watcher_thread = this; | |
1131 | |
1132 // Set the watcher thread to the highest OS priority which should not be | |
1133 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
1134 // is created. The only normal thread using this priority is the reference | |
1135 // handler thread, which runs for very short intervals only. | |
1136 // If the VMThread's priority is not lower than the WatcherThread profiling | |
1137 // will be inaccurate. | |
1138 os::set_priority(this, MaxPriority); | |
1139 if (!DisableStartThread) { | |
1140 os::start_thread(this); | |
1141 } | |
1142 } | |
1143 } | |
1144 | |
1145 void WatcherThread::run() { | |
1146 assert(this == watcher_thread(), "just checking"); | |
1147 | |
1148 this->record_stack_base_and_size(); | |
1149 this->initialize_thread_local_storage(); | |
1150 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1151 while(!_should_terminate) { | |
1152 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
1153 assert(watcher_thread() == this, "thread consistency check"); | |
1154 | |
1155 // Calculate how long it'll be until the next PeriodicTask work | |
1156 // should be done, and sleep that amount of time. | |
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1157 size_t time_to_wait = PeriodicTask::time_to_wait(); |
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1158 |
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1159 // we expect this to timeout - we only ever get unparked when |
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1160 // we should terminate |
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1161 { |
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1162 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1163 |
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1164 jlong prev_time = os::javaTimeNanos(); |
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1165 for (;;) { |
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1166 int res= _SleepEvent->park(time_to_wait); |
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1167 if (res == OS_TIMEOUT || _should_terminate) |
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1168 break; |
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1169 // spurious wakeup of some kind |
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1170 jlong now = os::javaTimeNanos(); |
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1171 time_to_wait -= (now - prev_time) / 1000000; |
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1172 if (time_to_wait <= 0) |
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1173 break; |
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1174 prev_time = now; |
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1175 } |
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1176 } |
0 | 1177 |
1178 if (is_error_reported()) { | |
1179 // A fatal error has happened, the error handler(VMError::report_and_die) | |
1180 // should abort JVM after creating an error log file. However in some | |
1181 // rare cases, the error handler itself might deadlock. Here we try to | |
1182 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
1183 // | |
1184 // This code is in WatcherThread because WatcherThread wakes up | |
1185 // periodically so the fatal error handler doesn't need to do anything; | |
1186 // also because the WatcherThread is less likely to crash than other | |
1187 // threads. | |
1188 | |
1189 for (;;) { | |
1190 if (!ShowMessageBoxOnError | |
1191 && (OnError == NULL || OnError[0] == '\0') | |
1192 && Arguments::abort_hook() == NULL) { | |
1193 os::sleep(this, 2 * 60 * 1000, false); | |
1194 fdStream err(defaultStream::output_fd()); | |
1195 err.print_raw_cr("# [ timer expired, abort... ]"); | |
1196 // skip atexit/vm_exit/vm_abort hooks | |
1197 os::die(); | |
1198 } | |
1199 | |
1200 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
1201 // ShowMessageBoxOnError when it is ready to abort. | |
1202 os::sleep(this, 5 * 1000, false); | |
1203 } | |
1204 } | |
1205 | |
1206 PeriodicTask::real_time_tick(time_to_wait); | |
1207 | |
1208 // If we have no more tasks left due to dynamic disenrollment, | |
1209 // shut down the thread since we don't currently support dynamic enrollment | |
1210 if (PeriodicTask::num_tasks() == 0) { | |
1211 _should_terminate = true; | |
1212 } | |
1213 } | |
1214 | |
1215 // Signal that it is terminated | |
1216 { | |
1217 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
1218 _watcher_thread = NULL; | |
1219 Terminator_lock->notify(); | |
1220 } | |
1221 | |
1222 // Thread destructor usually does this.. | |
1223 ThreadLocalStorage::set_thread(NULL); | |
1224 } | |
1225 | |
1226 void WatcherThread::start() { | |
1227 if (watcher_thread() == NULL) { | |
1228 _should_terminate = false; | |
1229 // Create the single instance of WatcherThread | |
1230 new WatcherThread(); | |
1231 } | |
1232 } | |
1233 | |
1234 void WatcherThread::stop() { | |
1235 // it is ok to take late safepoints here, if needed | |
1236 MutexLocker mu(Terminator_lock); | |
1237 _should_terminate = true; | |
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1238 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1239 |
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1240 Thread* watcher = watcher_thread(); |
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1241 if (watcher != NULL) |
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1242 watcher->_SleepEvent->unpark(); |
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1243 |
0 | 1244 while(watcher_thread() != NULL) { |
1245 // This wait should make safepoint checks, wait without a timeout, | |
1246 // and wait as a suspend-equivalent condition. | |
1247 // | |
1248 // Note: If the FlatProfiler is running, then this thread is waiting | |
1249 // for the WatcherThread to terminate and the WatcherThread, via the | |
1250 // FlatProfiler task, is waiting for the external suspend request on | |
1251 // this thread to complete. wait_for_ext_suspend_completion() will | |
1252 // eventually timeout, but that takes time. Making this wait a | |
1253 // suspend-equivalent condition solves that timeout problem. | |
1254 // | |
1255 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
1256 Mutex::_as_suspend_equivalent_flag); | |
1257 } | |
1258 } | |
1259 | |
1260 void WatcherThread::print_on(outputStream* st) const { | |
1261 st->print("\"%s\" ", name()); | |
1262 Thread::print_on(st); | |
1263 st->cr(); | |
1264 } | |
1265 | |
1266 // ======= JavaThread ======== | |
1267 | |
1268 // A JavaThread is a normal Java thread | |
1269 | |
1270 void JavaThread::initialize() { | |
1271 // Initialize fields | |
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1272 |
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1273 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1274 set_claimed_par_id(-1); |
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1275 |
0 | 1276 set_saved_exception_pc(NULL); |
1277 set_threadObj(NULL); | |
1278 _anchor.clear(); | |
1279 set_entry_point(NULL); | |
1280 set_jni_functions(jni_functions()); | |
1281 set_callee_target(NULL); | |
1282 set_vm_result(NULL); | |
1283 set_vm_result_2(NULL); | |
1284 set_vframe_array_head(NULL); | |
1285 set_vframe_array_last(NULL); | |
1286 set_deferred_locals(NULL); | |
1287 set_deopt_mark(NULL); | |
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1288 set_deopt_nmethod(NULL); |
0 | 1289 clear_must_deopt_id(); |
1290 set_monitor_chunks(NULL); | |
1291 set_next(NULL); | |
1292 set_thread_state(_thread_new); | |
1293 _terminated = _not_terminated; | |
1294 _privileged_stack_top = NULL; | |
1295 _array_for_gc = NULL; | |
1296 _suspend_equivalent = false; | |
1297 _in_deopt_handler = 0; | |
1298 _doing_unsafe_access = false; | |
1299 _stack_guard_state = stack_guard_unused; | |
1300 _exception_oop = NULL; | |
1301 _exception_pc = 0; | |
1302 _exception_handler_pc = 0; | |
1903 | 1303 _is_method_handle_return = 0; |
0 | 1304 _jvmti_thread_state= NULL; |
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1305 _should_post_on_exceptions_flag = JNI_FALSE; |
0 | 1306 _jvmti_get_loaded_classes_closure = NULL; |
1307 _interp_only_mode = 0; | |
1308 _special_runtime_exit_condition = _no_async_condition; | |
1309 _pending_async_exception = NULL; | |
1310 _is_compiling = false; | |
1311 _thread_stat = NULL; | |
1312 _thread_stat = new ThreadStatistics(); | |
1313 _blocked_on_compilation = false; | |
1314 _jni_active_critical = 0; | |
1315 _do_not_unlock_if_synchronized = false; | |
1316 _cached_monitor_info = NULL; | |
1317 _parker = Parker::Allocate(this) ; | |
1318 | |
1319 #ifndef PRODUCT | |
1320 _jmp_ring_index = 0; | |
1321 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
1322 record_jump(NULL, NULL, NULL, 0); | |
1323 } | |
1324 #endif /* PRODUCT */ | |
1325 | |
1326 set_thread_profiler(NULL); | |
1327 if (FlatProfiler::is_active()) { | |
1328 // This is where we would decide to either give each thread it's own profiler | |
1329 // or use one global one from FlatProfiler, | |
1330 // or up to some count of the number of profiled threads, etc. | |
1331 ThreadProfiler* pp = new ThreadProfiler(); | |
1332 pp->engage(); | |
1333 set_thread_profiler(pp); | |
1334 } | |
1335 | |
1336 // Setup safepoint state info for this thread | |
1337 ThreadSafepointState::create(this); | |
1338 | |
1339 debug_only(_java_call_counter = 0); | |
1340 | |
1341 // JVMTI PopFrame support | |
1342 _popframe_condition = popframe_inactive; | |
1343 _popframe_preserved_args = NULL; | |
1344 _popframe_preserved_args_size = 0; | |
1345 | |
1346 pd_initialize(); | |
1347 } | |
1348 | |
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1349 #ifndef SERIALGC |
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1350 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1351 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1352 #endif // !SERIALGC |
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1353 |
4006 | 1354 JavaThread::JavaThread(bool is_attaching_via_jni) : |
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1355 Thread() |
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1356 #ifndef SERIALGC |
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1357 , _satb_mark_queue(&_satb_mark_queue_set), |
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1358 _dirty_card_queue(&_dirty_card_queue_set) |
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1359 #endif // !SERIALGC |
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1360 { |
0 | 1361 initialize(); |
4006 | 1362 if (is_attaching_via_jni) { |
1363 _jni_attach_state = _attaching_via_jni; | |
1364 } else { | |
1365 _jni_attach_state = _not_attaching_via_jni; | |
1366 } | |
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1367 assert(_deferred_card_mark.is_empty(), "Default MemRegion ctor"); |
0 | 1368 } |
1369 | |
1370 bool JavaThread::reguard_stack(address cur_sp) { | |
1371 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
1372 return true; // Stack already guarded or guard pages not needed. | |
1373 } | |
1374 | |
1375 if (register_stack_overflow()) { | |
1376 // For those architectures which have separate register and | |
1377 // memory stacks, we must check the register stack to see if | |
1378 // it has overflowed. | |
1379 return false; | |
1380 } | |
1381 | |
1382 // Java code never executes within the yellow zone: the latter is only | |
1383 // there to provoke an exception during stack banging. If java code | |
1384 // is executing there, either StackShadowPages should be larger, or | |
1385 // some exception code in c1, c2 or the interpreter isn't unwinding | |
1386 // when it should. | |
1387 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
1388 | |
1389 enable_stack_yellow_zone(); | |
1390 return true; | |
1391 } | |
1392 | |
1393 bool JavaThread::reguard_stack(void) { | |
1394 return reguard_stack(os::current_stack_pointer()); | |
1395 } | |
1396 | |
1397 | |
1398 void JavaThread::block_if_vm_exited() { | |
1399 if (_terminated == _vm_exited) { | |
1400 // _vm_exited is set at safepoint, and Threads_lock is never released | |
1401 // we will block here forever | |
1402 Threads_lock->lock_without_safepoint_check(); | |
1403 ShouldNotReachHere(); | |
1404 } | |
1405 } | |
1406 | |
1407 | |
1408 // Remove this ifdef when C1 is ported to the compiler interface. | |
1409 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
1410 | |
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1411 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1412 Thread() |
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1413 #ifndef SERIALGC |
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1414 , _satb_mark_queue(&_satb_mark_queue_set), |
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1415 _dirty_card_queue(&_dirty_card_queue_set) |
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1416 #endif // !SERIALGC |
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1417 { |
0 | 1418 if (TraceThreadEvents) { |
1419 tty->print_cr("creating thread %p", this); | |
1420 } | |
1421 initialize(); | |
4006 | 1422 _jni_attach_state = _not_attaching_via_jni; |
0 | 1423 set_entry_point(entry_point); |
1424 // Create the native thread itself. | |
1425 // %note runtime_23 | |
1426 os::ThreadType thr_type = os::java_thread; | |
1427 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
1428 os::java_thread; | |
1429 os::create_thread(this, thr_type, stack_sz); | |
1430 | |
1431 // The _osthread may be NULL here because we ran out of memory (too many threads active). | |
1432 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
1433 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
1434 // the exception consists of creating the exception object & initializing it, initialization | |
1435 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
1436 // | |
1437 // The thread is still suspended when we reach here. Thread must be explicit started | |
1438 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
1439 // by calling Threads:add. The reason why this is not done here, is because the thread | |
1440 // object must be fully initialized (take a look at JVM_Start) | |
1441 } | |
1442 | |
1443 JavaThread::~JavaThread() { | |
1444 if (TraceThreadEvents) { | |
1445 tty->print_cr("terminate thread %p", this); | |
1446 } | |
1447 | |
1448 // JSR166 -- return the parker to the free list | |
1449 Parker::Release(_parker); | |
1450 _parker = NULL ; | |
1451 | |
1452 // Free any remaining previous UnrollBlock | |
1453 vframeArray* old_array = vframe_array_last(); | |
1454 | |
1455 if (old_array != NULL) { | |
1456 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
1457 old_array->set_unroll_block(NULL); | |
1458 delete old_info; | |
1459 delete old_array; | |
1460 } | |
1461 | |
1462 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
1463 if (deferred != NULL) { | |
1464 // This can only happen if thread is destroyed before deoptimization occurs. | |
1465 assert(deferred->length() != 0, "empty array!"); | |
1466 do { | |
1467 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
1468 deferred->remove_at(0); | |
1469 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
1470 delete dlv; | |
1471 } while (deferred->length() != 0); | |
1472 delete deferred; | |
1473 } | |
1474 | |
1475 // All Java related clean up happens in exit | |
1476 ThreadSafepointState::destroy(this); | |
1477 if (_thread_profiler != NULL) delete _thread_profiler; | |
1478 if (_thread_stat != NULL) delete _thread_stat; | |
1479 } | |
1480 | |
1481 | |
1482 // The first routine called by a new Java thread | |
1483 void JavaThread::run() { | |
1484 // initialize thread-local alloc buffer related fields | |
1485 this->initialize_tlab(); | |
1486 | |
1487 // used to test validitity of stack trace backs | |
1488 this->record_base_of_stack_pointer(); | |
1489 | |
1490 // Record real stack base and size. | |
1491 this->record_stack_base_and_size(); | |
1492 | |
1493 // Initialize thread local storage; set before calling MutexLocker | |
1494 this->initialize_thread_local_storage(); | |
1495 | |
1496 this->create_stack_guard_pages(); | |
1497 | |
1681
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1498 this->cache_global_variables(); |
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1499 |
0 | 1500 // Thread is now sufficient initialized to be handled by the safepoint code as being |
1501 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
1502 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
1503 | |
1504 assert(JavaThread::current() == this, "sanity check"); | |
1505 assert(!Thread::current()->owns_locks(), "sanity check"); | |
1506 | |
1507 DTRACE_THREAD_PROBE(start, this); | |
1508 | |
1509 // This operation might block. We call that after all safepoint checks for a new thread has | |
1510 // been completed. | |
1511 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1512 | |
1513 if (JvmtiExport::should_post_thread_life()) { | |
1514 JvmtiExport::post_thread_start(this); | |
1515 } | |
1516 | |
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1517 EVENT_BEGIN(TraceEventThreadStart, event); |
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1518 EVENT_COMMIT(event, |
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1519 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1520 |
0 | 1521 // We call another function to do the rest so we are sure that the stack addresses used |
1522 // from there will be lower than the stack base just computed | |
1523 thread_main_inner(); | |
1524 | |
1525 // Note, thread is no longer valid at this point! | |
1526 } | |
1527 | |
1528 | |
1529 void JavaThread::thread_main_inner() { | |
1530 assert(JavaThread::current() == this, "sanity check"); | |
1531 assert(this->threadObj() != NULL, "just checking"); | |
1532 | |
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1533 // Execute thread entry point unless this thread has a pending exception |
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1534 // or has been stopped before starting. |
0 | 1535 // Note: Due to JVM_StopThread we can have pending exceptions already! |
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1536 if (!this->has_pending_exception() && |
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1537 !java_lang_Thread::is_stillborn(this->threadObj())) { |
4006 | 1538 { |
1539 ResourceMark rm(this); | |
1540 this->set_native_thread_name(this->get_thread_name()); | |
1541 } | |
0 | 1542 HandleMark hm(this); |
1543 this->entry_point()(this, this); | |
1544 } | |
1545 | |
1546 DTRACE_THREAD_PROBE(stop, this); | |
1547 | |
1548 this->exit(false); | |
1549 delete this; | |
1550 } | |
1551 | |
1552 | |
1553 static void ensure_join(JavaThread* thread) { | |
1554 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
1555 Handle threadObj(thread, thread->threadObj()); | |
1556 assert(threadObj.not_null(), "java thread object must exist"); | |
1557 ObjectLocker lock(threadObj, thread); | |
1558 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1559 thread->clear_pending_exception(); | |
1560 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
1561 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
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1562 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1563 // to complete once we've done the notify_all below |
0 | 1564 java_lang_Thread::set_thread(threadObj(), NULL); |
1565 lock.notify_all(thread); | |
1566 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1567 thread->clear_pending_exception(); | |
1568 } | |
1569 | |
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1570 |
0 | 1571 // For any new cleanup additions, please check to see if they need to be applied to |
1572 // cleanup_failed_attach_current_thread as well. | |
1573 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
1574 assert(this == JavaThread::current(), "thread consistency check"); | |
1575 if (!InitializeJavaLangSystem) return; | |
1576 | |
1577 HandleMark hm(this); | |
1578 Handle uncaught_exception(this, this->pending_exception()); | |
1579 this->clear_pending_exception(); | |
1580 Handle threadObj(this, this->threadObj()); | |
1581 assert(threadObj.not_null(), "Java thread object should be created"); | |
1582 | |
1583 if (get_thread_profiler() != NULL) { | |
1584 get_thread_profiler()->disengage(); | |
1585 ResourceMark rm; | |
1586 get_thread_profiler()->print(get_thread_name()); | |
1587 } | |
1588 | |
1589 | |
1590 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
1591 { | |
1592 EXCEPTION_MARK; | |
1593 | |
1594 CLEAR_PENDING_EXCEPTION; | |
1595 } | |
1596 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
1597 // has to be fixed by a runtime query method | |
1598 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
1599 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
1600 // java.lang.Thread.dispatchUncaughtException | |
1601 if (uncaught_exception.not_null()) { | |
1602 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
1603 { | |
1604 EXCEPTION_MARK; | |
1605 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
1606 // call it. Otherwise we have an older library without the JSR-166 changes, | |
1607 // so call ThreadGroup.uncaughtException() | |
1608 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
1609 CallInfo callinfo; | |
1142 | 1610 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1611 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
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1612 vmSymbols::dispatchUncaughtException_name(), |
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1613 vmSymbols::throwable_void_signature(), |
0 | 1614 KlassHandle(), false, false, THREAD); |
1615 CLEAR_PENDING_EXCEPTION; | |
1616 methodHandle method = callinfo.selected_method(); | |
1617 if (method.not_null()) { | |
1618 JavaValue result(T_VOID); | |
1619 JavaCalls::call_virtual(&result, | |
1620 threadObj, thread_klass, | |
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1621 vmSymbols::dispatchUncaughtException_name(), |
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1622 vmSymbols::throwable_void_signature(), |
0 | 1623 uncaught_exception, |
1624 THREAD); | |
1625 } else { | |
1142 | 1626 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
0 | 1627 JavaValue result(T_VOID); |
1628 JavaCalls::call_virtual(&result, | |
1629 group, thread_group, | |
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1630 vmSymbols::uncaughtException_name(), |
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1631 vmSymbols::thread_throwable_void_signature(), |
0 | 1632 threadObj, // Arg 1 |
1633 uncaught_exception, // Arg 2 | |
1634 THREAD); | |
1635 } | |
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1636 if (HAS_PENDING_EXCEPTION) { |
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1637 ResourceMark rm(this); |
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1638 jio_fprintf(defaultStream::error_stream(), |
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1639 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1640 " in thread \"%s\"\n", |
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1641 Klass::cast(pending_exception()->klass())->external_name(), |
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1642 get_thread_name()); |
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1643 CLEAR_PENDING_EXCEPTION; |
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1644 } |
0 | 1645 } |
1646 } | |
1647 | |
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1648 // Called before the java thread exit since we want to read info |
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1649 // from java_lang_Thread object |
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1650 EVENT_BEGIN(TraceEventThreadEnd, event); |
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1651 EVENT_COMMIT(event, |
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1652 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1653 |
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1654 // Call after last event on thread |
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1655 EVENT_THREAD_EXIT(this); |
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1656 |
0 | 1657 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during |
1658 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
1659 // is deprecated anyhow. | |
1660 { int count = 3; | |
1661 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
1662 EXCEPTION_MARK; | |
1663 JavaValue result(T_VOID); | |
1142 | 1664 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1665 JavaCalls::call_virtual(&result, |
1666 threadObj, thread_klass, | |
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1667 vmSymbols::exit_method_name(), |
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1668 vmSymbols::void_method_signature(), |
0 | 1669 THREAD); |
1670 CLEAR_PENDING_EXCEPTION; | |
1671 } | |
1672 } | |
1673 | |
1674 // notify JVMTI | |
1675 if (JvmtiExport::should_post_thread_life()) { | |
1676 JvmtiExport::post_thread_end(this); | |
1677 } | |
1678 | |
1679 // We have notified the agents that we are exiting, before we go on, | |
1680 // we must check for a pending external suspend request and honor it | |
1681 // in order to not surprise the thread that made the suspend request. | |
1682 while (true) { | |
1683 { | |
1684 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1685 if (!is_external_suspend()) { | |
1686 set_terminated(_thread_exiting); | |
1687 ThreadService::current_thread_exiting(this); | |
1688 break; | |
1689 } | |
1690 // Implied else: | |
1691 // Things get a little tricky here. We have a pending external | |
1692 // suspend request, but we are holding the SR_lock so we | |
1693 // can't just self-suspend. So we temporarily drop the lock | |
1694 // and then self-suspend. | |
1695 } | |
1696 | |
1697 ThreadBlockInVM tbivm(this); | |
1698 java_suspend_self(); | |
1699 | |
1700 // We're done with this suspend request, but we have to loop around | |
1701 // and check again. Eventually we will get SR_lock without a pending | |
1702 // external suspend request and will be able to mark ourselves as | |
1703 // exiting. | |
1704 } | |
1705 // no more external suspends are allowed at this point | |
1706 } else { | |
1707 // before_exit() has already posted JVMTI THREAD_END events | |
1708 } | |
1709 | |
1710 // Notify waiters on thread object. This has to be done after exit() is called | |
1711 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
1712 // group should have the destroyed bit set before waiters are notified). | |
1713 ensure_join(this); | |
1714 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
1715 | |
1716 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
1717 // held by this thread must be released. A detach operation must only | |
1718 // get here if there are no Java frames on the stack. Therefore, any | |
1719 // owned monitors at this point MUST be JNI-acquired monitors which are | |
1720 // pre-inflated and in the monitor cache. | |
1721 // | |
1722 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
1723 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
1724 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
1725 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
1726 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
1727 } | |
1728 | |
1729 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
1730 // is in a consistent state, in case GC happens | |
1731 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
1732 | |
1733 if (active_handles() != NULL) { | |
1734 JNIHandleBlock* block = active_handles(); | |
1735 set_active_handles(NULL); | |
1736 JNIHandleBlock::release_block(block); | |
1737 } | |
1738 | |
1739 if (free_handle_block() != NULL) { | |
1740 JNIHandleBlock* block = free_handle_block(); | |
1741 set_free_handle_block(NULL); | |
1742 JNIHandleBlock::release_block(block); | |
1743 } | |
1744 | |
1745 // These have to be removed while this is still a valid thread. | |
1746 remove_stack_guard_pages(); | |
1747 | |
1748 if (UseTLAB) { | |
1749 tlab().make_parsable(true); // retire TLAB | |
1750 } | |
1751 | |
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1752 if (JvmtiEnv::environments_might_exist()) { |
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1753 JvmtiExport::cleanup_thread(this); |
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1754 } |
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1755 |
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1756 #ifndef SERIALGC |
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1757 // We must flush G1-related buffers before removing a thread from |
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1758 // the list of active threads. |
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1759 if (UseG1GC) { |
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1760 flush_barrier_queues(); |
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1761 } |
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1762 #endif |
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1763 |
0 | 1764 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
1765 Threads::remove(this); | |
1766 } | |
1767 | |
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1768 #ifndef SERIALGC |
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1769 // Flush G1-related queues. |
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1770 void JavaThread::flush_barrier_queues() { |
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1771 satb_mark_queue().flush(); |
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1772 dirty_card_queue().flush(); |
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1773 } |
1842
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1774 |
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1775 void JavaThread::initialize_queues() { |
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1776 assert(!SafepointSynchronize::is_at_safepoint(), |
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1777 "we should not be at a safepoint"); |
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1778 |
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1779 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1780 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1781 // The SATB queue should have been constructed with its active |
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1782 // field set to false. |
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1783 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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1784 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1785 // If we are creating the thread during a marking cycle, we should |
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1786 // set the active field of the SATB queue to true. |
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1787 if (satb_queue_set.is_active()) { |
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1788 satb_queue.set_active(true); |
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1789 } |
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1790 |
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1791 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1792 // The dirty card queue should have been constructed with its |
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1793 // active field set to true. |
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1794 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1795 } |
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1796 #endif // !SERIALGC |
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1797 |
0 | 1798 void JavaThread::cleanup_failed_attach_current_thread() { |
441
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1799 if (get_thread_profiler() != NULL) { |
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1800 get_thread_profiler()->disengage(); |
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1801 ResourceMark rm; |
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1802 get_thread_profiler()->print(get_thread_name()); |
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1803 } |
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1804 |
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1805 if (active_handles() != NULL) { |
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1806 JNIHandleBlock* block = active_handles(); |
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1807 set_active_handles(NULL); |
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1808 JNIHandleBlock::release_block(block); |
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1809 } |
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1810 |
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1811 if (free_handle_block() != NULL) { |
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1812 JNIHandleBlock* block = free_handle_block(); |
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1813 set_free_handle_block(NULL); |
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1814 JNIHandleBlock::release_block(block); |
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1815 } |
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1816 |
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1817 // These have to be removed while this is still a valid thread. |
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1818 remove_stack_guard_pages(); |
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1819 |
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1820 if (UseTLAB) { |
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1821 tlab().make_parsable(true); // retire TLAB, if any |
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1822 } |
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1823 |
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1824 #ifndef SERIALGC |
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1825 if (UseG1GC) { |
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1826 flush_barrier_queues(); |
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1827 } |
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1828 #endif |
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1829 |
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1830 Threads::remove(this); |
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1831 delete this; |
0 | 1832 } |
1833 | |
1834 | |
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1835 |
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1836 |
0 | 1837 JavaThread* JavaThread::active() { |
1838 Thread* thread = ThreadLocalStorage::thread(); | |
1839 assert(thread != NULL, "just checking"); | |
1840 if (thread->is_Java_thread()) { | |
1841 return (JavaThread*) thread; | |
1842 } else { | |
1843 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
1844 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
1845 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
1846 assert(ret->is_Java_thread(), "must be a Java thread"); | |
1847 return ret; | |
1848 } | |
1849 } | |
1850 | |
1851 bool JavaThread::is_lock_owned(address adr) const { | |
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1852 if (Thread::is_lock_owned(adr)) return true; |
0 | 1853 |
1854 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
1855 if (chunk->contains(adr)) return true; | |
1856 } | |
1857 | |
1858 return false; | |
1859 } | |
1860 | |
1861 | |
1862 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
1863 chunk->set_next(monitor_chunks()); | |
1864 set_monitor_chunks(chunk); | |
1865 } | |
1866 | |
1867 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
1868 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
1869 if (monitor_chunks() == chunk) { | |
1870 set_monitor_chunks(chunk->next()); | |
1871 } else { | |
1872 MonitorChunk* prev = monitor_chunks(); | |
1873 while (prev->next() != chunk) prev = prev->next(); | |
1874 prev->set_next(chunk->next()); | |
1875 } | |
1876 } | |
1877 | |
1878 // JVM support. | |
1879 | |
1880 // Note: this function shouldn't block if it's called in | |
1881 // _thread_in_native_trans state (such as from | |
1882 // check_special_condition_for_native_trans()). | |
1883 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
1884 | |
1885 if (has_last_Java_frame() && has_async_condition()) { | |
1886 // If we are at a polling page safepoint (not a poll return) | |
1887 // then we must defer async exception because live registers | |
1888 // will be clobbered by the exception path. Poll return is | |
1889 // ok because the call we a returning from already collides | |
1890 // with exception handling registers and so there is no issue. | |
1891 // (The exception handling path kills call result registers but | |
1892 // this is ok since the exception kills the result anyway). | |
1893 | |
1894 if (is_at_poll_safepoint()) { | |
1895 // if the code we are returning to has deoptimized we must defer | |
1896 // the exception otherwise live registers get clobbered on the | |
1897 // exception path before deoptimization is able to retrieve them. | |
1898 // | |
1899 RegisterMap map(this, false); | |
1900 frame caller_fr = last_frame().sender(&map); | |
1901 assert(caller_fr.is_compiled_frame(), "what?"); | |
1902 if (caller_fr.is_deoptimized_frame()) { | |
1903 if (TraceExceptions) { | |
1904 ResourceMark rm; | |
1905 tty->print_cr("deferred async exception at compiled safepoint"); | |
1906 } | |
1907 return; | |
1908 } | |
1909 } | |
1910 } | |
1911 | |
1912 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
1913 if (condition == _no_async_condition) { | |
1914 // Conditions have changed since has_special_runtime_exit_condition() | |
1915 // was called: | |
1916 // - if we were here only because of an external suspend request, | |
1917 // then that was taken care of above (or cancelled) so we are done | |
1918 // - if we were here because of another async request, then it has | |
1919 // been cleared between the has_special_runtime_exit_condition() | |
1920 // and now so again we are done | |
1921 return; | |
1922 } | |
1923 | |
1924 // Check for pending async. exception | |
1925 if (_pending_async_exception != NULL) { | |
1926 // Only overwrite an already pending exception, if it is not a threadDeath. | |
1142 | 1927 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 1928 |
1929 // We cannot call Exceptions::_throw(...) here because we cannot block | |
1930 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
1931 | |
1932 if (TraceExceptions) { | |
1933 ResourceMark rm; | |
1934 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
1935 if (has_last_Java_frame() ) { | |
1936 frame f = last_frame(); | |
1937 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
1938 } | |
1939 tty->print_cr(" of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
1940 } | |
1941 _pending_async_exception = NULL; | |
1942 clear_has_async_exception(); | |
1943 } | |
1944 } | |
1945 | |
1946 if (check_unsafe_error && | |
1947 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
1948 condition = _no_async_condition; // done | |
1949 switch (thread_state()) { | |
1950 case _thread_in_vm: | |
1951 { | |
1952 JavaThread* THREAD = this; | |
1953 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
1954 } | |
1955 case _thread_in_native: | |
1956 { | |
1957 ThreadInVMfromNative tiv(this); | |
1958 JavaThread* THREAD = this; | |
1959 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
1960 } | |
1961 case _thread_in_Java: | |
1962 { | |
1963 ThreadInVMfromJava tiv(this); | |
1964 JavaThread* THREAD = this; | |
1965 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
1966 } | |
1967 default: | |
1968 ShouldNotReachHere(); | |
1969 } | |
1970 } | |
1971 | |
1972 assert(condition == _no_async_condition || has_pending_exception() || | |
1973 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
1974 "must have handled the async condition, if no exception"); | |
1975 } | |
1976 | |
1977 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
1978 // | |
1979 // Check for pending external suspend. Internal suspend requests do | |
1980 // not use handle_special_runtime_exit_condition(). | |
1981 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
1982 // thread is not the current thread. In older versions of jdbx, jdbx | |
1983 // threads could call into the VM with another thread's JNIEnv so we | |
1984 // can be here operating on behalf of a suspended thread (4432884). | |
1985 bool do_self_suspend = is_external_suspend_with_lock(); | |
1986 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
1987 // | |
1988 // Because thread is external suspended the safepoint code will count | |
1989 // thread as at a safepoint. This can be odd because we can be here | |
1990 // as _thread_in_Java which would normally transition to _thread_blocked | |
1991 // at a safepoint. We would like to mark the thread as _thread_blocked | |
1992 // before calling java_suspend_self like all other callers of it but | |
1993 // we must then observe proper safepoint protocol. (We can't leave | |
1994 // _thread_blocked with a safepoint in progress). However we can be | |
1995 // here as _thread_in_native_trans so we can't use a normal transition | |
1996 // constructor/destructor pair because they assert on that type of | |
1997 // transition. We could do something like: | |
1998 // | |
1999 // JavaThreadState state = thread_state(); | |
2000 // set_thread_state(_thread_in_vm); | |
2001 // { | |
2002 // ThreadBlockInVM tbivm(this); | |
2003 // java_suspend_self() | |
2004 // } | |
2005 // set_thread_state(_thread_in_vm_trans); | |
2006 // if (safepoint) block; | |
2007 // set_thread_state(state); | |
2008 // | |
2009 // but that is pretty messy. Instead we just go with the way the | |
2010 // code has worked before and note that this is the only path to | |
2011 // java_suspend_self that doesn't put the thread in _thread_blocked | |
2012 // mode. | |
2013 | |
2014 frame_anchor()->make_walkable(this); | |
2015 java_suspend_self(); | |
2016 | |
2017 // We might be here for reasons in addition to the self-suspend request | |
2018 // so check for other async requests. | |
2019 } | |
2020 | |
2021 if (check_asyncs) { | |
2022 check_and_handle_async_exceptions(); | |
2023 } | |
2024 } | |
2025 | |
2026 void JavaThread::send_thread_stop(oop java_throwable) { | |
2027 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
2028 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
2029 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
2030 | |
2031 // Do not throw asynchronous exceptions against the compiler thread | |
2032 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
2033 if (is_Compiler_thread()) return; | |
2034 | |
2035 { | |
2036 // Actually throw the Throwable against the target Thread - however | |
2037 // only if there is no thread death exception installed already. | |
1142 | 2038 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 2039 // If the topmost frame is a runtime stub, then we are calling into |
2040 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
2041 // must deoptimize the caller before continuing, as the compiled exception handler table | |
2042 // may not be valid | |
2043 if (has_last_Java_frame()) { | |
2044 frame f = last_frame(); | |
2045 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
2046 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2047 RegisterMap reg_map(this, UseBiasedLocking); | |
2048 frame compiled_frame = f.sender(®_map); | |
2049 if (compiled_frame.can_be_deoptimized()) { | |
2050 Deoptimization::deoptimize(this, compiled_frame, ®_map); | |
2051 } | |
2052 } | |
2053 } | |
2054 | |
2055 // Set async. pending exception in thread. | |
2056 set_pending_async_exception(java_throwable); | |
2057 | |
2058 if (TraceExceptions) { | |
2059 ResourceMark rm; | |
2060 tty->print_cr("Pending Async. exception installed of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
2061 } | |
2062 // for AbortVMOnException flag | |
2063 NOT_PRODUCT(Exceptions::debug_check_abort(instanceKlass::cast(_pending_async_exception->klass())->external_name())); | |
2064 } | |
2065 } | |
2066 | |
2067 | |
2068 // Interrupt thread so it will wake up from a potential wait() | |
2069 Thread::interrupt(this); | |
2070 } | |
2071 | |
2072 // External suspension mechanism. | |
2073 // | |
2074 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
2075 // to any VM_locks and it is at a transition | |
2076 // Self-suspension will happen on the transition out of the vm. | |
2077 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
2078 // | |
2079 // Guarantees on return: | |
2080 // + Target thread will not execute any new bytecode (that's why we need to | |
2081 // force a safepoint) | |
2082 // + Target thread will not enter any new monitors | |
2083 // | |
2084 void JavaThread::java_suspend() { | |
2085 { MutexLocker mu(Threads_lock); | |
2086 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
2087 return; | |
2088 } | |
2089 } | |
2090 | |
2091 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2092 if (!is_external_suspend()) { | |
2093 // a racing resume has cancelled us; bail out now | |
2094 return; | |
2095 } | |
2096 | |
2097 // suspend is done | |
2098 uint32_t debug_bits = 0; | |
2099 // Warning: is_ext_suspend_completed() may temporarily drop the | |
2100 // SR_lock to allow the thread to reach a stable thread state if | |
2101 // it is currently in a transient thread state. | |
2102 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
2103 SuspendRetryDelay, &debug_bits) ) { | |
2104 return; | |
2105 } | |
2106 } | |
2107 | |
2108 VM_ForceSafepoint vm_suspend; | |
2109 VMThread::execute(&vm_suspend); | |
2110 } | |
2111 | |
2112 // Part II of external suspension. | |
2113 // A JavaThread self suspends when it detects a pending external suspend | |
2114 // request. This is usually on transitions. It is also done in places | |
2115 // where continuing to the next transition would surprise the caller, | |
2116 // e.g., monitor entry. | |
2117 // | |
2118 // Returns the number of times that the thread self-suspended. | |
2119 // | |
2120 // Note: DO NOT call java_suspend_self() when you just want to block current | |
2121 // thread. java_suspend_self() is the second stage of cooperative | |
2122 // suspension for external suspend requests and should only be used | |
2123 // to complete an external suspend request. | |
2124 // | |
2125 int JavaThread::java_suspend_self() { | |
2126 int ret = 0; | |
2127 | |
2128 // we are in the process of exiting so don't suspend | |
2129 if (is_exiting()) { | |
2130 clear_external_suspend(); | |
2131 return ret; | |
2132 } | |
2133 | |
2134 assert(_anchor.walkable() || | |
2135 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
2136 "must have walkable stack"); | |
2137 | |
2138 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2139 | |
979 | 2140 assert(!this->is_ext_suspended(), |
0 | 2141 "a thread trying to self-suspend should not already be suspended"); |
2142 | |
2143 if (this->is_suspend_equivalent()) { | |
2144 // If we are self-suspending as a result of the lifting of a | |
2145 // suspend equivalent condition, then the suspend_equivalent | |
2146 // flag is not cleared until we set the ext_suspended flag so | |
2147 // that wait_for_ext_suspend_completion() returns consistent | |
2148 // results. | |
2149 this->clear_suspend_equivalent(); | |
2150 } | |
2151 | |
2152 // A racing resume may have cancelled us before we grabbed SR_lock | |
2153 // above. Or another external suspend request could be waiting for us | |
2154 // by the time we return from SR_lock()->wait(). The thread | |
2155 // that requested the suspension may already be trying to walk our | |
2156 // stack and if we return now, we can change the stack out from under | |
2157 // it. This would be a "bad thing (TM)" and cause the stack walker | |
2158 // to crash. We stay self-suspended until there are no more pending | |
2159 // external suspend requests. | |
2160 while (is_external_suspend()) { | |
2161 ret++; | |
2162 this->set_ext_suspended(); | |
2163 | |
2164 // _ext_suspended flag is cleared by java_resume() | |
2165 while (is_ext_suspended()) { | |
2166 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
2167 } | |
2168 } | |
2169 | |
2170 return ret; | |
2171 } | |
2172 | |
2173 #ifdef ASSERT | |
2174 // verify the JavaThread has not yet been published in the Threads::list, and | |
2175 // hence doesn't need protection from concurrent access at this stage | |
2176 void JavaThread::verify_not_published() { | |
2177 if (!Threads_lock->owned_by_self()) { | |
2178 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
2179 assert( !Threads::includes(this), | |
2180 "java thread shouldn't have been published yet!"); | |
2181 } | |
2182 else { | |
2183 assert( !Threads::includes(this), | |
2184 "java thread shouldn't have been published yet!"); | |
2185 } | |
2186 } | |
2187 #endif | |
2188 | |
2189 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2190 // progress or when _suspend_flags is non-zero. | |
2191 // Current thread needs to self-suspend if there is a suspend request and/or | |
2192 // block if a safepoint is in progress. | |
2193 // Async exception ISN'T checked. | |
2194 // Note only the ThreadInVMfromNative transition can call this function | |
2195 // directly and when thread state is _thread_in_native_trans | |
2196 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
2197 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
2198 | |
2199 JavaThread *curJT = JavaThread::current(); | |
2200 bool do_self_suspend = thread->is_external_suspend(); | |
2201 | |
2202 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
2203 | |
2204 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2205 // thread is not the current thread. In older versions of jdbx, jdbx | |
2206 // threads could call into the VM with another thread's JNIEnv so we | |
2207 // can be here operating on behalf of a suspended thread (4432884). | |
2208 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
2209 JavaThreadState state = thread->thread_state(); | |
2210 | |
2211 // We mark this thread_blocked state as a suspend-equivalent so | |
2212 // that a caller to is_ext_suspend_completed() won't be confused. | |
2213 // The suspend-equivalent state is cleared by java_suspend_self(). | |
2214 thread->set_suspend_equivalent(); | |
2215 | |
2216 // If the safepoint code sees the _thread_in_native_trans state, it will | |
2217 // wait until the thread changes to other thread state. There is no | |
2218 // guarantee on how soon we can obtain the SR_lock and complete the | |
2219 // self-suspend request. It would be a bad idea to let safepoint wait for | |
2220 // too long. Temporarily change the state to _thread_blocked to | |
2221 // let the VM thread know that this thread is ready for GC. The problem | |
2222 // of changing thread state is that safepoint could happen just after | |
2223 // java_suspend_self() returns after being resumed, and VM thread will | |
2224 // see the _thread_blocked state. We must check for safepoint | |
2225 // after restoring the state and make sure we won't leave while a safepoint | |
2226 // is in progress. | |
2227 thread->set_thread_state(_thread_blocked); | |
2228 thread->java_suspend_self(); | |
2229 thread->set_thread_state(state); | |
2230 // Make sure new state is seen by VM thread | |
2231 if (os::is_MP()) { | |
2232 if (UseMembar) { | |
2233 // Force a fence between the write above and read below | |
2234 OrderAccess::fence(); | |
2235 } else { | |
2236 // Must use this rather than serialization page in particular on Windows | |
2237 InterfaceSupport::serialize_memory(thread); | |
2238 } | |
2239 } | |
2240 } | |
2241 | |
2242 if (SafepointSynchronize::do_call_back()) { | |
2243 // If we are safepointing, then block the caller which may not be | |
2244 // the same as the target thread (see above). | |
2245 SafepointSynchronize::block(curJT); | |
2246 } | |
2247 | |
2248 if (thread->is_deopt_suspend()) { | |
2249 thread->clear_deopt_suspend(); | |
2250 RegisterMap map(thread, false); | |
2251 frame f = thread->last_frame(); | |
2252 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
2253 f = f.sender(&map); | |
2254 } | |
2255 if (f.id() == thread->must_deopt_id()) { | |
2256 thread->clear_must_deopt_id(); | |
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2257 f.deoptimize(thread); |
0 | 2258 } else { |
2259 fatal("missed deoptimization!"); | |
2260 } | |
2261 } | |
2262 } | |
2263 | |
2264 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2265 // progress or when _suspend_flags is non-zero. | |
2266 // Current thread needs to self-suspend if there is a suspend request and/or | |
2267 // block if a safepoint is in progress. | |
2268 // Also check for pending async exception (not including unsafe access error). | |
2269 // Note only the native==>VM/Java barriers can call this function and when | |
2270 // thread state is _thread_in_native_trans. | |
2271 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
2272 check_safepoint_and_suspend_for_native_trans(thread); | |
2273 | |
2274 if (thread->has_async_exception()) { | |
2275 // We are in _thread_in_native_trans state, don't handle unsafe | |
2276 // access error since that may block. | |
2277 thread->check_and_handle_async_exceptions(false); | |
2278 } | |
2279 } | |
2280 | |
2281 // We need to guarantee the Threads_lock here, since resumes are not | |
2282 // allowed during safepoint synchronization | |
2283 // Can only resume from an external suspension | |
2284 void JavaThread::java_resume() { | |
2285 assert_locked_or_safepoint(Threads_lock); | |
2286 | |
2287 // Sanity check: thread is gone, has started exiting or the thread | |
2288 // was not externally suspended. | |
2289 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
2290 return; | |
2291 } | |
2292 | |
2293 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2294 | |
2295 clear_external_suspend(); | |
2296 | |
2297 if (is_ext_suspended()) { | |
2298 clear_ext_suspended(); | |
2299 SR_lock()->notify_all(); | |
2300 } | |
2301 } | |
2302 | |
2303 void JavaThread::create_stack_guard_pages() { | |
2304 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
2305 address low_addr = stack_base() - stack_size(); | |
2306 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2307 | |
2308 int allocate = os::allocate_stack_guard_pages(); | |
2309 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
2310 | |
1320
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2311 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
0 | 2312 warning("Attempt to allocate stack guard pages failed."); |
2313 return; | |
2314 } | |
2315 | |
2316 if (os::guard_memory((char *) low_addr, len)) { | |
2317 _stack_guard_state = stack_guard_enabled; | |
2318 } else { | |
2319 warning("Attempt to protect stack guard pages failed."); | |
2320 if (os::uncommit_memory((char *) low_addr, len)) { | |
2321 warning("Attempt to deallocate stack guard pages failed."); | |
2322 } | |
2323 } | |
2324 } | |
2325 | |
2326 void JavaThread::remove_stack_guard_pages() { | |
2327 if (_stack_guard_state == stack_guard_unused) return; | |
2328 address low_addr = stack_base() - stack_size(); | |
2329 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2330 | |
2331 if (os::allocate_stack_guard_pages()) { | |
1320
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2332 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
0 | 2333 _stack_guard_state = stack_guard_unused; |
2334 } else { | |
2335 warning("Attempt to deallocate stack guard pages failed."); | |
2336 } | |
2337 } else { | |
2338 if (_stack_guard_state == stack_guard_unused) return; | |
2339 if (os::unguard_memory((char *) low_addr, len)) { | |
2340 _stack_guard_state = stack_guard_unused; | |
2341 } else { | |
2342 warning("Attempt to unprotect stack guard pages failed."); | |
2343 } | |
2344 } | |
2345 } | |
2346 | |
2347 void JavaThread::enable_stack_yellow_zone() { | |
2348 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2349 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
2350 | |
2351 // The base notation is from the stacks point of view, growing downward. | |
2352 // We need to adjust it to work correctly with guard_memory() | |
2353 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2354 | |
2355 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
2356 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
2357 | |
2358 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
2359 _stack_guard_state = stack_guard_enabled; | |
2360 } else { | |
2361 warning("Attempt to guard stack yellow zone failed."); | |
2362 } | |
2363 enable_register_stack_guard(); | |
2364 } | |
2365 | |
2366 void JavaThread::disable_stack_yellow_zone() { | |
2367 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2368 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
2369 | |
2370 // Simply return if called for a thread that does not use guard pages. | |
2371 if (_stack_guard_state == stack_guard_unused) return; | |
2372 | |
2373 // The base notation is from the stacks point of view, growing downward. | |
2374 // We need to adjust it to work correctly with guard_memory() | |
2375 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2376 | |
2377 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
2378 _stack_guard_state = stack_guard_yellow_disabled; | |
2379 } else { | |
2380 warning("Attempt to unguard stack yellow zone failed."); | |
2381 } | |
2382 disable_register_stack_guard(); | |
2383 } | |
2384 | |
2385 void JavaThread::enable_stack_red_zone() { | |
2386 // The base notation is from the stacks point of view, growing downward. | |
2387 // We need to adjust it to work correctly with guard_memory() | |
2388 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2389 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2390 | |
2391 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
2392 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
2393 | |
2394 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
2395 warning("Attempt to guard stack red zone failed."); | |
2396 } | |
2397 } | |
2398 | |
2399 void JavaThread::disable_stack_red_zone() { | |
2400 // The base notation is from the stacks point of view, growing downward. | |
2401 // We need to adjust it to work correctly with guard_memory() | |
2402 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2403 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2404 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
2405 warning("Attempt to unguard stack red zone failed."); | |
2406 } | |
2407 } | |
2408 | |
2409 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
2410 // ignore is there is no stack | |
2411 if (!has_last_Java_frame()) return; | |
2412 // traverse the stack frames. Starts from top frame. | |
2413 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2414 frame* fr = fst.current(); | |
2415 f(fr, fst.register_map()); | |
2416 } | |
2417 } | |
2418 | |
2419 | |
2420 #ifndef PRODUCT | |
2421 // Deoptimization | |
2422 // Function for testing deoptimization | |
2423 void JavaThread::deoptimize() { | |
2424 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2425 StackFrameStream fst(this, UseBiasedLocking); | |
2426 bool deopt = false; // Dump stack only if a deopt actually happens. | |
2427 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
2428 // Iterate over all frames in the thread and deoptimize | |
2429 for(; !fst.is_done(); fst.next()) { | |
2430 if(fst.current()->can_be_deoptimized()) { | |
2431 | |
2432 if (only_at) { | |
2433 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
2434 // consists of comma or carriage return separated numbers so | |
2435 // search for the current bci in that string. | |
2436 address pc = fst.current()->pc(); | |
2437 nmethod* nm = (nmethod*) fst.current()->cb(); | |
2438 ScopeDesc* sd = nm->scope_desc_at( pc); | |
2439 char buffer[8]; | |
2440 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
2441 size_t len = strlen(buffer); | |
2442 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
2443 while (found != NULL) { | |
2444 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
2445 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
2446 // Check that the bci found is bracketed by terminators. | |
2447 break; | |
2448 } | |
2449 found = strstr(found + 1, buffer); | |
2450 } | |
2451 if (!found) { | |
2452 continue; | |
2453 } | |
2454 } | |
2455 | |
2456 if (DebugDeoptimization && !deopt) { | |
2457 deopt = true; // One-time only print before deopt | |
2458 tty->print_cr("[BEFORE Deoptimization]"); | |
2459 trace_frames(); | |
2460 trace_stack(); | |
2461 } | |
2462 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2463 } | |
2464 } | |
2465 | |
2466 if (DebugDeoptimization && deopt) { | |
2467 tty->print_cr("[AFTER Deoptimization]"); | |
2468 trace_frames(); | |
2469 } | |
2470 } | |
2471 | |
2472 | |
2473 // Make zombies | |
2474 void JavaThread::make_zombies() { | |
2475 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2476 if (fst.current()->can_be_deoptimized()) { | |
2477 // it is a Java nmethod | |
2478 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
2479 nm->make_not_entrant(); | |
2480 } | |
2481 } | |
2482 } | |
2483 #endif // PRODUCT | |
2484 | |
2485 | |
2486 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
2487 if (!has_last_Java_frame()) return; | |
2488 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2489 StackFrameStream fst(this, UseBiasedLocking); | |
2490 for(; !fst.is_done(); fst.next()) { | |
2491 if (fst.current()->should_be_deoptimized()) { | |
2492 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2493 } | |
2494 } | |
2495 } | |
2496 | |
2497 | |
2498 // GC support | |
2499 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
2500 | |
2501 void JavaThread::gc_epilogue() { | |
2502 frames_do(frame_gc_epilogue); | |
2503 } | |
2504 | |
2505 | |
2506 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
2507 | |
2508 void JavaThread::gc_prologue() { | |
2509 frames_do(frame_gc_prologue); | |
2510 } | |
2511 | |
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2512 // If the caller is a NamedThread, then remember, in the current scope, |
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2513 // the given JavaThread in its _processed_thread field. |
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2514 class RememberProcessedThread: public StackObj { |
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2515 NamedThread* _cur_thr; |
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2516 public: |
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2517 RememberProcessedThread(JavaThread* jthr) { |
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2518 Thread* thread = Thread::current(); |
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2519 if (thread->is_Named_thread()) { |
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2520 _cur_thr = (NamedThread *)thread; |
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2521 _cur_thr->set_processed_thread(jthr); |
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2522 } else { |
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2523 _cur_thr = NULL; |
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2524 } |
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2525 } |
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2526 |
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2527 ~RememberProcessedThread() { |
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2528 if (_cur_thr) { |
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2529 _cur_thr->set_processed_thread(NULL); |
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2530 } |
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2531 } |
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2532 }; |
0 | 2533 |
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2534 void JavaThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
1166 | 2535 // Verify that the deferred card marks have been flushed. |
2536 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
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2537 |
0 | 2538 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
2539 // since there may be more than one thread using each ThreadProfiler. | |
2540 | |
2541 // Traverse the GCHandles | |
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2542 Thread::oops_do(f, cf); |
0 | 2543 |
2544 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2545 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2546 | |
2547 if (has_last_Java_frame()) { | |
1119
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2548 // Record JavaThread to GC thread |
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2549 RememberProcessedThread rpt(this); |
0 | 2550 |
2551 // Traverse the privileged stack | |
2552 if (_privileged_stack_top != NULL) { | |
2553 _privileged_stack_top->oops_do(f); | |
2554 } | |
2555 | |
2556 // traverse the registered growable array | |
2557 if (_array_for_gc != NULL) { | |
2558 for (int index = 0; index < _array_for_gc->length(); index++) { | |
2559 f->do_oop(_array_for_gc->adr_at(index)); | |
2560 } | |
2561 } | |
2562 | |
2563 // Traverse the monitor chunks | |
2564 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
2565 chunk->oops_do(f); | |
2566 } | |
2567 | |
2568 // Traverse the execution stack | |
2569 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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2570 fst.current()->oops_do(f, cf, fst.register_map()); |
0 | 2571 } |
2572 } | |
2573 | |
2574 // callee_target is never live across a gc point so NULL it here should | |
2575 // it still contain a methdOop. | |
2576 | |
2577 set_callee_target(NULL); | |
2578 | |
2579 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
2580 // If we have deferred set_locals there might be oops waiting to be | |
2581 // written | |
2582 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
2583 if (list != NULL) { | |
2584 for (int i = 0; i < list->length(); i++) { | |
2585 list->at(i)->oops_do(f); | |
2586 } | |
2587 } | |
2588 | |
2589 // Traverse instance variables at the end since the GC may be moving things | |
2590 // around using this function | |
2591 f->do_oop((oop*) &_threadObj); | |
2592 f->do_oop((oop*) &_vm_result); | |
2593 f->do_oop((oop*) &_vm_result_2); | |
2594 f->do_oop((oop*) &_exception_oop); | |
2595 f->do_oop((oop*) &_pending_async_exception); | |
2596 | |
2597 if (jvmti_thread_state() != NULL) { | |
2598 jvmti_thread_state()->oops_do(f); | |
2599 } | |
2600 } | |
2601 | |
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2602 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
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2603 Thread::nmethods_do(cf); // (super method is a no-op) |
0 | 2604 |
2605 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2606 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2607 | |
2608 if (has_last_Java_frame()) { | |
2609 // Traverse the execution stack | |
2610 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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2611 fst.current()->nmethods_do(cf); |
0 | 2612 } |
2613 } | |
2614 } | |
2615 | |
2616 // Printing | |
2617 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
2618 switch (_thread_state) { | |
2619 case _thread_uninitialized: return "_thread_uninitialized"; | |
2620 case _thread_new: return "_thread_new"; | |
2621 case _thread_new_trans: return "_thread_new_trans"; | |
2622 case _thread_in_native: return "_thread_in_native"; | |
2623 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
2624 case _thread_in_vm: return "_thread_in_vm"; | |
2625 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
2626 case _thread_in_Java: return "_thread_in_Java"; | |
2627 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
2628 case _thread_blocked: return "_thread_blocked"; | |
2629 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
2630 default: return "unknown thread state"; | |
2631 } | |
2632 } | |
2633 | |
2634 #ifndef PRODUCT | |
2635 void JavaThread::print_thread_state_on(outputStream *st) const { | |
2636 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
2637 }; | |
2638 void JavaThread::print_thread_state() const { | |
2639 print_thread_state_on(tty); | |
2640 }; | |
2641 #endif // PRODUCT | |
2642 | |
2643 // Called by Threads::print() for VM_PrintThreads operation | |
2644 void JavaThread::print_on(outputStream *st) const { | |
2645 st->print("\"%s\" ", get_thread_name()); | |
2646 oop thread_oop = threadObj(); | |
2647 if (thread_oop != NULL && java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
2648 Thread::print_on(st); | |
2649 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
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2650 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
0 | 2651 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
2652 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
2653 } | |
2654 #ifndef PRODUCT | |
2655 print_thread_state_on(st); | |
2656 _safepoint_state->print_on(st); | |
2657 #endif // PRODUCT | |
2658 } | |
2659 | |
2660 // Called by fatal error handler. The difference between this and | |
2661 // JavaThread::print() is that we can't grab lock or allocate memory. | |
2662 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
2663 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
2664 oop thread_obj = threadObj(); | |
2665 if (thread_obj != NULL) { | |
2666 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
2667 } | |
2668 st->print(" ["); | |
2669 st->print("%s", _get_thread_state_name(_thread_state)); | |
2670 if (osthread()) { | |
2671 st->print(", id=%d", osthread()->thread_id()); | |
2672 } | |
2673 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
2674 _stack_base - _stack_size, _stack_base); | |
2675 st->print("]"); | |
2676 return; | |
2677 } | |
2678 | |
2679 // Verification | |
2680 | |
2681 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
2682 | |
2683 void JavaThread::verify() { | |
2684 // Verify oops in the thread. | |
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2685 oops_do(&VerifyOopClosure::verify_oop, NULL); |
0 | 2686 |
2687 // Verify the stack frames. | |
2688 frames_do(frame_verify); | |
2689 } | |
2690 | |
2691 // CR 6300358 (sub-CR 2137150) | |
2692 // Most callers of this method assume that it can't return NULL but a | |
2693 // thread may not have a name whilst it is in the process of attaching to | |
2694 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
2695 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
2696 // if vm exit occurs during initialization). These cases can all be accounted | |
2697 // for such that this method never returns NULL. | |
2698 const char* JavaThread::get_thread_name() const { | |
2699 #ifdef ASSERT | |
2700 // early safepoints can hit while current thread does not yet have TLS | |
2701 if (!SafepointSynchronize::is_at_safepoint()) { | |
2702 Thread *cur = Thread::current(); | |
2703 if (!(cur->is_Java_thread() && cur == this)) { | |
2704 // Current JavaThreads are allowed to get their own name without | |
2705 // the Threads_lock. | |
2706 assert_locked_or_safepoint(Threads_lock); | |
2707 } | |
2708 } | |
2709 #endif // ASSERT | |
2710 return get_thread_name_string(); | |
2711 } | |
2712 | |
2713 // Returns a non-NULL representation of this thread's name, or a suitable | |
2714 // descriptive string if there is no set name | |
2715 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
2716 const char* name_str; | |
2717 oop thread_obj = threadObj(); | |
2718 if (thread_obj != NULL) { | |
2719 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
2720 if (name != NULL) { | |
2721 if (buf == NULL) { | |
2722 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2723 } | |
2724 else { | |
2725 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
2726 } | |
2727 } | |
4006 | 2728 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 |
0 | 2729 name_str = "<no-name - thread is attaching>"; |
2730 } | |
2731 else { | |
2732 name_str = Thread::name(); | |
2733 } | |
2734 } | |
2735 else { | |
2736 name_str = Thread::name(); | |
2737 } | |
2738 assert(name_str != NULL, "unexpected NULL thread name"); | |
2739 return name_str; | |
2740 } | |
2741 | |
2742 | |
2743 const char* JavaThread::get_threadgroup_name() const { | |
2744 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2745 oop thread_obj = threadObj(); | |
2746 if (thread_obj != NULL) { | |
2747 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2748 if (thread_group != NULL) { | |
2749 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
2750 // ThreadGroup.name can be null | |
2751 if (name != NULL) { | |
2752 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2753 return str; | |
2754 } | |
2755 } | |
2756 } | |
2757 return NULL; | |
2758 } | |
2759 | |
2760 const char* JavaThread::get_parent_name() const { | |
2761 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2762 oop thread_obj = threadObj(); | |
2763 if (thread_obj != NULL) { | |
2764 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2765 if (thread_group != NULL) { | |
2766 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
2767 if (parent != NULL) { | |
2768 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
2769 // ThreadGroup.name can be null | |
2770 if (name != NULL) { | |
2771 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2772 return str; | |
2773 } | |
2774 } | |
2775 } | |
2776 } | |
2777 return NULL; | |
2778 } | |
2779 | |
2780 ThreadPriority JavaThread::java_priority() const { | |
2781 oop thr_oop = threadObj(); | |
2782 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
2783 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
2784 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
2785 return priority; | |
2786 } | |
2787 | |
2788 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
2789 | |
2790 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
2791 // Link Java Thread object <-> C++ Thread | |
2792 | |
2793 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
2794 // and put it into a new Handle. The Handle "thread_oop" can then | |
2795 // be used to pass the C++ thread object to other methods. | |
2796 | |
2797 // Set the Java level thread object (jthread) field of the | |
2798 // new thread (a JavaThread *) to C++ thread object using the | |
2799 // "thread_oop" handle. | |
2800 | |
2801 // Set the thread field (a JavaThread *) of the | |
2802 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
2803 | |
2804 Handle thread_oop(Thread::current(), | |
2805 JNIHandles::resolve_non_null(jni_thread)); | |
2806 assert(instanceKlass::cast(thread_oop->klass())->is_linked(), | |
2807 "must be initialized"); | |
2808 set_threadObj(thread_oop()); | |
2809 java_lang_Thread::set_thread(thread_oop(), this); | |
2810 | |
2811 if (prio == NoPriority) { | |
2812 prio = java_lang_Thread::priority(thread_oop()); | |
2813 assert(prio != NoPriority, "A valid priority should be present"); | |
2814 } | |
2815 | |
2816 // Push the Java priority down to the native thread; needs Threads_lock | |
2817 Thread::set_priority(this, prio); | |
2818 | |
2819 // Add the new thread to the Threads list and set it in motion. | |
2820 // We must have threads lock in order to call Threads::add. | |
2821 // It is crucial that we do not block before the thread is | |
2822 // added to the Threads list for if a GC happens, then the java_thread oop | |
2823 // will not be visited by GC. | |
2824 Threads::add(this); | |
2825 } | |
2826 | |
2827 oop JavaThread::current_park_blocker() { | |
2828 // Support for JSR-166 locks | |
2829 oop thread_oop = threadObj(); | |
242 | 2830 if (thread_oop != NULL && |
2831 JDK_Version::current().supports_thread_park_blocker()) { | |
0 | 2832 return java_lang_Thread::park_blocker(thread_oop); |
2833 } | |
2834 return NULL; | |
2835 } | |
2836 | |
2837 | |
2838 void JavaThread::print_stack_on(outputStream* st) { | |
2839 if (!has_last_Java_frame()) return; | |
2840 ResourceMark rm; | |
2841 HandleMark hm; | |
2842 | |
2843 RegisterMap reg_map(this); | |
2844 vframe* start_vf = last_java_vframe(®_map); | |
2845 int count = 0; | |
2846 for (vframe* f = start_vf; f; f = f->sender() ) { | |
2847 if (f->is_java_frame()) { | |
2848 javaVFrame* jvf = javaVFrame::cast(f); | |
2849 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
2850 | |
2851 // Print out lock information | |
2852 if (JavaMonitorsInStackTrace) { | |
2853 jvf->print_lock_info_on(st, count); | |
2854 } | |
2855 } else { | |
2856 // Ignore non-Java frames | |
2857 } | |
2858 | |
2859 // Bail-out case for too deep stacks | |
2860 count++; | |
2861 if (MaxJavaStackTraceDepth == count) return; | |
2862 } | |
2863 } | |
2864 | |
2865 | |
2866 // JVMTI PopFrame support | |
2867 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
2868 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
2869 if (in_bytes(size_in_bytes) != 0) { | |
2870 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes)); | |
2871 _popframe_preserved_args_size = in_bytes(size_in_bytes); | |
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2872 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
0 | 2873 } |
2874 } | |
2875 | |
2876 void* JavaThread::popframe_preserved_args() { | |
2877 return _popframe_preserved_args; | |
2878 } | |
2879 | |
2880 ByteSize JavaThread::popframe_preserved_args_size() { | |
2881 return in_ByteSize(_popframe_preserved_args_size); | |
2882 } | |
2883 | |
2884 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
2885 int sz = in_bytes(popframe_preserved_args_size()); | |
2886 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
2887 return in_WordSize(sz / wordSize); | |
2888 } | |
2889 | |
2890 void JavaThread::popframe_free_preserved_args() { | |
2891 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
2892 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args); | |
2893 _popframe_preserved_args = NULL; | |
2894 _popframe_preserved_args_size = 0; | |
2895 } | |
2896 | |
2897 #ifndef PRODUCT | |
2898 | |
2899 void JavaThread::trace_frames() { | |
2900 tty->print_cr("[Describe stack]"); | |
2901 int frame_no = 1; | |
2902 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2903 tty->print(" %d. ", frame_no++); | |
2904 fst.current()->print_value_on(tty,this); | |
2905 tty->cr(); | |
2906 } | |
2907 } | |
2908 | |
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2909 class PrintAndVerifyOopClosure: public OopClosure { |
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2910 protected: |
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|
2911 template <class T> inline void do_oop_work(T* p) { |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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diff
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|
2912 oop obj = oopDesc::load_decode_heap_oop(p); |
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3899
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|
2913 if (obj == NULL) return; |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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3899
diff
changeset
|
2914 tty->print(INTPTR_FORMAT ": ", p); |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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3899
diff
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|
2915 if (obj->is_oop_or_null()) { |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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diff
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|
2916 if (obj->is_objArray()) { |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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3899
diff
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|
2917 tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj); |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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diff
changeset
|
2918 } else { |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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3899
diff
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|
2919 obj->print(); |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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3899
diff
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|
2920 } |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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3899
diff
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|
2921 } else { |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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3899
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|
2922 tty->print_cr("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj); |
7588156f5cf9
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|
2923 } |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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3899
diff
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|
2924 tty->cr(); |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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3899
diff
changeset
|
2925 } |
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never
parents:
3899
diff
changeset
|
2926 public: |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
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diff
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|
2927 virtual void do_oop(oop* p) { do_oop_work(p); } |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2928 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3899
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|
2929 }; |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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changeset
|
2930 |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2931 |
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|
2932 static void oops_print(frame* f, const RegisterMap *map) { |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2933 PrintAndVerifyOopClosure print; |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2934 f->print_value(); |
7588156f5cf9
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|
2935 f->oops_do(&print, NULL, (RegisterMap*)map); |
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|
2936 } |
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diff
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|
2937 |
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|
2938 // Print our all the locations that contain oops and whether they are |
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never
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|
2939 // valid or not. This useful when trying to find the oldest frame |
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never
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diff
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|
2940 // where an oop has gone bad since the frame walk is from youngest to |
7588156f5cf9
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never
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diff
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|
2941 // oldest. |
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never
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|
2942 void JavaThread::trace_oops() { |
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diff
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|
2943 tty->print_cr("[Trace oops]"); |
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|
2944 frames_do(oops_print); |
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|
2945 } |
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|
2946 |
0 | 2947 |
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
2948 #ifdef ASSERT |
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2949 // Print or validate the layout of stack frames |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2950 void JavaThread::print_frame_layout(int depth, bool validate_only) { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2951 ResourceMark rm; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2952 PRESERVE_EXCEPTION_MARK; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2953 FrameValues values; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2954 int frame_no = 0; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2955 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) { |
2e038ad0c1d0
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never
parents:
2416
diff
changeset
|
2956 fst.current()->describe(values, ++frame_no); |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2957 if (depth == frame_no) break; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2958 } |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2959 if (validate_only) { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2960 values.validate(); |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2961 } else { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2962 tty->print_cr("[Describe stack layout]"); |
4042
b20d64f83668
7090904: JSR 292: JRuby junit test crashes in PSScavengeRootsClosure::do_oop
twisti
parents:
4007
diff
changeset
|
2963 values.print(this); |
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2964 } |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
2965 } |
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
2966 #endif |
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
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|
2967 |
0 | 2968 void JavaThread::trace_stack_from(vframe* start_vf) { |
2969 ResourceMark rm; | |
2970 int vframe_no = 1; | |
2971 for (vframe* f = start_vf; f; f = f->sender() ) { | |
2972 if (f->is_java_frame()) { | |
2973 javaVFrame::cast(f)->print_activation(vframe_no++); | |
2974 } else { | |
2975 f->print(); | |
2976 } | |
2977 if (vframe_no > StackPrintLimit) { | |
2978 tty->print_cr("...<more frames>..."); | |
2979 return; | |
2980 } | |
2981 } | |
2982 } | |
2983 | |
2984 | |
2985 void JavaThread::trace_stack() { | |
2986 if (!has_last_Java_frame()) return; | |
2987 ResourceMark rm; | |
2988 HandleMark hm; | |
2989 RegisterMap reg_map(this); | |
2990 trace_stack_from(last_java_vframe(®_map)); | |
2991 } | |
2992 | |
2993 | |
2994 #endif // PRODUCT | |
2995 | |
2996 | |
2997 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
2998 assert(reg_map != NULL, "a map must be given"); | |
2999 frame f = last_frame(); | |
3000 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
3001 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
3002 } | |
3003 return NULL; | |
3004 } | |
3005 | |
3006 | |
3007 klassOop JavaThread::security_get_caller_class(int depth) { | |
3008 vframeStream vfst(this); | |
3009 vfst.security_get_caller_frame(depth); | |
3010 if (!vfst.at_end()) { | |
3011 return vfst.method()->method_holder(); | |
3012 } | |
3013 return NULL; | |
3014 } | |
3015 | |
3016 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
3017 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
3018 CompileBroker::compiler_thread_loop(); | |
3019 } | |
3020 | |
3021 // Create a CompilerThread | |
3022 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
3023 : JavaThread(&compiler_thread_entry) { | |
3024 _env = NULL; | |
3025 _log = NULL; | |
3026 _task = NULL; | |
3027 _queue = queue; | |
3028 _counters = counters; | |
1584 | 3029 _buffer_blob = NULL; |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3030 _scanned_nmethod = NULL; |
0 | 3031 |
3032 #ifndef PRODUCT | |
3033 _ideal_graph_printer = NULL; | |
3034 #endif | |
3035 } | |
3036 | |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3037 void CompilerThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3038 JavaThread::oops_do(f, cf); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3039 if (_scanned_nmethod != NULL && cf != NULL) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3040 // Safepoints can occur when the sweeper is scanning an nmethod so |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3041 // process it here to make sure it isn't unloaded in the middle of |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3042 // a scan. |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3043 cf->do_code_blob(_scanned_nmethod); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3044 } |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3045 } |
0 | 3046 |
3047 // ======= Threads ======== | |
3048 | |
3049 // The Threads class links together all active threads, and provides | |
3050 // operations over all threads. It is protected by its own Mutex | |
3051 // lock, which is also used in other contexts to protect thread | |
3052 // operations from having the thread being operated on from exiting | |
3053 // and going away unexpectedly (e.g., safepoint synchronization) | |
3054 | |
3055 JavaThread* Threads::_thread_list = NULL; | |
3056 int Threads::_number_of_threads = 0; | |
3057 int Threads::_number_of_non_daemon_threads = 0; | |
3058 int Threads::_return_code = 0; | |
3059 size_t JavaThread::_stack_size_at_create = 0; | |
3060 | |
3061 // All JavaThreads | |
3062 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
3063 | |
3064 void os_stream(); | |
3065 | |
3066 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
3067 void Threads::threads_do(ThreadClosure* tc) { | |
3068 assert_locked_or_safepoint(Threads_lock); | |
3069 // ALL_JAVA_THREADS iterates through all JavaThreads | |
3070 ALL_JAVA_THREADS(p) { | |
3071 tc->do_thread(p); | |
3072 } | |
3073 // Someday we could have a table or list of all non-JavaThreads. | |
3074 // For now, just manually iterate through them. | |
3075 tc->do_thread(VMThread::vm_thread()); | |
3076 Universe::heap()->gc_threads_do(tc); | |
323
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3077 WatcherThread *wt = WatcherThread::watcher_thread(); |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3078 // Strictly speaking, the following NULL check isn't sufficient to make sure |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3079 // the data for WatcherThread is still valid upon being examined. However, |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3080 // considering that WatchThread terminates when the VM is on the way to |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3081 // exit at safepoint, the chance of the above is extremely small. The right |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3082 // way to prevent termination of WatcherThread would be to acquire |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3083 // Terminator_lock, but we can't do that without violating the lock rank |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3084 // checking in some cases. |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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286
diff
changeset
|
3085 if (wt != NULL) |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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286
diff
changeset
|
3086 tc->do_thread(wt); |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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286
diff
changeset
|
3087 |
0 | 3088 // If CompilerThreads ever become non-JavaThreads, add them here |
3089 } | |
3090 | |
3091 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
3092 | |
242 | 3093 extern void JDK_Version_init(); |
3094 | |
0 | 3095 // Check version |
3096 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
3097 | |
3098 // Initialize the output stream module | |
3099 ostream_init(); | |
3100 | |
3101 // Process java launcher properties. | |
3102 Arguments::process_sun_java_launcher_properties(args); | |
3103 | |
3104 // Initialize the os module before using TLS | |
3105 os::init(); | |
3106 | |
3107 // Initialize system properties. | |
3108 Arguments::init_system_properties(); | |
3109 | |
242 | 3110 // So that JDK version can be used as a discrimintor when parsing arguments |
3111 JDK_Version_init(); | |
3112 | |
1864
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3113 // Update/Initialize System properties after JDK version number is known |
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3114 Arguments::init_version_specific_system_properties(); |
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3115 |
0 | 3116 // Parse arguments |
3117 jint parse_result = Arguments::parse(args); | |
3118 if (parse_result != JNI_OK) return parse_result; | |
3119 | |
3120 if (PauseAtStartup) { | |
3121 os::pause(); | |
3122 } | |
3123 | |
4006 | 3124 #ifndef USDT2 |
0 | 3125 HS_DTRACE_PROBE(hotspot, vm__init__begin); |
4006 | 3126 #else /* USDT2 */ |
3127 HOTSPOT_VM_INIT_BEGIN(); | |
3128 #endif /* USDT2 */ | |
0 | 3129 |
3130 // Record VM creation timing statistics | |
3131 TraceVmCreationTime create_vm_timer; | |
3132 create_vm_timer.start(); | |
3133 | |
3134 // Timing (must come after argument parsing) | |
3135 TraceTime timer("Create VM", TraceStartupTime); | |
3136 | |
3137 // Initialize the os module after parsing the args | |
3138 jint os_init_2_result = os::init_2(); | |
3139 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
3140 | |
3141 // Initialize output stream logging | |
3142 ostream_init_log(); | |
3143 | |
3144 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
3145 // Must be before create_vm_init_agents() | |
3146 if (Arguments::init_libraries_at_startup()) { | |
3147 convert_vm_init_libraries_to_agents(); | |
3148 } | |
3149 | |
3150 // Launch -agentlib/-agentpath and converted -Xrun agents | |
3151 if (Arguments::init_agents_at_startup()) { | |
3152 create_vm_init_agents(); | |
3153 } | |
3154 | |
3155 // Initialize Threads state | |
3156 _thread_list = NULL; | |
3157 _number_of_threads = 0; | |
3158 _number_of_non_daemon_threads = 0; | |
3159 | |
3160 // Initialize TLS | |
3161 ThreadLocalStorage::init(); | |
3162 | |
3163 // Initialize global data structures and create system classes in heap | |
3164 vm_init_globals(); | |
3165 | |
3166 // Attach the main thread to this os thread | |
3167 JavaThread* main_thread = new JavaThread(); | |
3168 main_thread->set_thread_state(_thread_in_vm); | |
3169 // must do this before set_active_handles and initialize_thread_local_storage | |
3170 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
3171 // change the stack size recorded here to one based on the java thread | |
3172 // stacksize. This adjusted size is what is used to figure the placement | |
3173 // of the guard pages. | |
3174 main_thread->record_stack_base_and_size(); | |
3175 main_thread->initialize_thread_local_storage(); | |
3176 | |
3177 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
3178 | |
3179 if (!main_thread->set_as_starting_thread()) { | |
3180 vm_shutdown_during_initialization( | |
3181 "Failed necessary internal allocation. Out of swap space"); | |
3182 delete main_thread; | |
3183 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3184 return JNI_ENOMEM; | |
3185 } | |
3186 | |
3187 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
3188 // crash Linux VM, see notes in os_linux.cpp. | |
3189 main_thread->create_stack_guard_pages(); | |
3190 | |
1878 | 3191 // Initialize Java-Level synchronization subsystem |
3192 ObjectMonitor::Initialize() ; | |
0 | 3193 |
3194 // Initialize global modules | |
3195 jint status = init_globals(); | |
3196 if (status != JNI_OK) { | |
3197 delete main_thread; | |
3198 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3199 return status; | |
3200 } | |
3201 | |
4800
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|
3202 // Must be run after init_ft which initializes ft_enabled |
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|
3203 if (TRACE_INITIALIZE() != JNI_OK) { |
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|
3204 vm_exit_during_initialization("Failed to initialize tracing backend"); |
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|
3205 } |
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changeset
|
3206 |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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diff
changeset
|
3207 // Should be done after the heap is fully created |
126ea7725993
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changeset
|
3208 main_thread->cache_global_variables(); |
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|
3209 |
0 | 3210 HandleMark hm; |
3211 | |
3212 { MutexLocker mu(Threads_lock); | |
3213 Threads::add(main_thread); | |
3214 } | |
3215 | |
3216 // Any JVMTI raw monitors entered in onload will transition into | |
3217 // real raw monitor. VM is setup enough here for raw monitor enter. | |
3218 JvmtiExport::transition_pending_onload_raw_monitors(); | |
3219 | |
3220 if (VerifyBeforeGC && | |
3221 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
3222 Universe::heap()->prepare_for_verify(); | |
3223 Universe::verify(); // make sure we're starting with a clean slate | |
3224 } | |
3225 | |
3226 // Create the VMThread | |
3227 { TraceTime timer("Start VMThread", TraceStartupTime); | |
3228 VMThread::create(); | |
3229 Thread* vmthread = VMThread::vm_thread(); | |
3230 | |
3231 if (!os::create_thread(vmthread, os::vm_thread)) | |
3232 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
3233 | |
3234 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
3235 // Monitors can have spurious returns, must always check another state flag | |
3236 { | |
3237 MutexLocker ml(Notify_lock); | |
3238 os::start_thread(vmthread); | |
3239 while (vmthread->active_handles() == NULL) { | |
3240 Notify_lock->wait(); | |
3241 } | |
3242 } | |
3243 } | |
3244 | |
3245 assert (Universe::is_fully_initialized(), "not initialized"); | |
3246 EXCEPTION_MARK; | |
3247 | |
3248 // At this point, the Universe is initialized, but we have not executed | |
3249 // any byte code. Now is a good time (the only time) to dump out the | |
3250 // internal state of the JVM for sharing. | |
3251 | |
3252 if (DumpSharedSpaces) { | |
3253 Universe::heap()->preload_and_dump(CHECK_0); | |
3254 ShouldNotReachHere(); | |
3255 } | |
3256 | |
3257 // Always call even when there are not JVMTI environments yet, since environments | |
3258 // may be attached late and JVMTI must track phases of VM execution | |
3259 JvmtiExport::enter_start_phase(); | |
3260 | |
3261 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
3262 JvmtiExport::post_vm_start(); | |
3263 | |
3264 { | |
3265 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
3266 | |
3267 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3268 create_vm_init_libraries(); | |
3269 } | |
3270 | |
3271 if (InitializeJavaLangString) { | |
2177
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3272 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
0 | 3273 } else { |
3274 warning("java.lang.String not initialized"); | |
3275 } | |
3276 | |
18
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3277 if (AggressiveOpts) { |
192
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3278 { |
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|
3279 // Forcibly initialize java/util/HashMap and mutate the private |
6d13fcb3663f
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3280 // static final "frontCacheEnabled" field before we start creating instances |
18
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3281 #ifdef ASSERT |
2177
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3282 klassOop tmp_k = SystemDictionary::find(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
192
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3283 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
18
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|
3284 #endif |
2177
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3285 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
192
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3286 KlassHandle k = KlassHandle(THREAD, k_o); |
6d13fcb3663f
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|
3287 guarantee(k.not_null(), "Must find java/util/HashMap"); |
6d13fcb3663f
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3288 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
6d13fcb3663f
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kvn
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diff
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|
3289 ik->initialize(CHECK_0); |
6d13fcb3663f
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kvn
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diff
changeset
|
3290 fieldDescriptor fd; |
6d13fcb3663f
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diff
changeset
|
3291 // Possible we might not find this field; if so, don't break |
6d13fcb3663f
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diff
changeset
|
3292 if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
2376
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|
3293 k()->java_mirror()->bool_field_put(fd.offset(), true); |
192
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|
3294 } |
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kvn
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62
diff
changeset
|
3295 } |
6d13fcb3663f
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kvn
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diff
changeset
|
3296 |
6d13fcb3663f
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kvn
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diff
changeset
|
3297 if (UseStringCache) { |
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
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diff
changeset
|
3298 // Forcibly initialize java/lang/StringValue and mutate the private |
192
6d13fcb3663f
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|
3299 // static final "stringCacheEnabled" field before we start creating instances |
2177
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2162
diff
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|
3300 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbols::java_lang_StringValue(), Handle(), Handle(), CHECK_0); |
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3301 // 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
|
3302 if (k_o != NULL) { |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3303 KlassHandle k = KlassHandle(THREAD, k_o); |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
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441
diff
changeset
|
3304 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3305 ik->initialize(CHECK_0); |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3306 fieldDescriptor fd; |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3307 // Possible we might not find this field: if so, silently don't break |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3308 if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
2376
c7f3d0b4570f
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parents:
2302
diff
changeset
|
3309 k()->java_mirror()->bool_field_put(fd.offset(), true); |
669
eca19a8425b5
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phh
parents:
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diff
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|
3310 } |
192
6d13fcb3663f
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diff
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|
3311 } |
18
c7d713375c94
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0
diff
changeset
|
3312 } |
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phh
parents:
0
diff
changeset
|
3313 } |
c7d713375c94
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phh
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diff
changeset
|
3314 |
0 | 3315 // Initialize java_lang.System (needed before creating the thread) |
3316 if (InitializeJavaLangSystem) { | |
2177
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|
3317 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
|
3318 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); |
0 | 3319 Handle thread_group = create_initial_thread_group(CHECK_0); |
3320 Universe::set_main_thread_group(thread_group()); | |
2177
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diff
changeset
|
3321 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); |
0 | 3322 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); |
3323 main_thread->set_threadObj(thread_object); | |
3324 // Set thread status to running since main thread has | |
3325 // been started and running. | |
3326 java_lang_Thread::set_thread_status(thread_object, | |
3327 java_lang_Thread::RUNNABLE); | |
3328 | |
3329 // The VM preresolve methods to these classes. Make sure that get initialized | |
2177
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6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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diff
changeset
|
3330 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
|
3331 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); |
0 | 3332 // The VM creates & returns objects of this class. Make sure it's initialized. |
2177
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6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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diff
changeset
|
3333 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); |
0 | 3334 call_initializeSystemClass(CHECK_0); |
3335 } else { | |
3336 warning("java.lang.System not initialized"); | |
3337 } | |
3338 | |
3339 // an instance of OutOfMemory exception has been allocated earlier | |
3340 if (InitializeJavaLangExceptionsErrors) { | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3341 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3342 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3343 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3344 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3345 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3346 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3347 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); |
0 | 3348 } else { |
3349 warning("java.lang.OutOfMemoryError has not been initialized"); | |
3350 warning("java.lang.NullPointerException has not been initialized"); | |
3351 warning("java.lang.ClassCastException has not been initialized"); | |
3352 warning("java.lang.ArrayStoreException has not been initialized"); | |
3353 warning("java.lang.ArithmeticException has not been initialized"); | |
3354 warning("java.lang.StackOverflowError has not been initialized"); | |
3355 } | |
2416
38fea01eb669
6817525: turn on method handle functionality by default for JSR 292
twisti
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2376
diff
changeset
|
3356 } |
0 | 3357 |
3358 // See : bugid 4211085. | |
3359 // Background : the static initializer of java.lang.Compiler tries to read | |
3360 // property"java.compiler" and read & write property "java.vm.info". | |
3361 // When a security manager is installed through the command line | |
3362 // option "-Djava.security.manager", the above properties are not | |
3363 // readable and the static initializer for java.lang.Compiler fails | |
3364 // resulting in a NoClassDefFoundError. This can happen in any | |
3365 // user code which calls methods in java.lang.Compiler. | |
3366 // Hack : the hack is to pre-load and initialize this class, so that only | |
3367 // system domains are on the stack when the properties are read. | |
3368 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
3369 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
3370 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
3371 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
3372 // Once that is done, we should remove this hack. | |
2177
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diff
changeset
|
3373 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
0 | 3374 |
3375 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
3376 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
3377 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
3378 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
3379 // This should also be taken out as soon as 4211383 gets fixed. | |
3380 reset_vm_info_property(CHECK_0); | |
3381 | |
3382 quicken_jni_functions(); | |
3383 | |
3384 // Set flag that basic initialization has completed. Used by exceptions and various | |
3385 // debug stuff, that does not work until all basic classes have been initialized. | |
3386 set_init_completed(); | |
3387 | |
4006 | 3388 #ifndef USDT2 |
0 | 3389 HS_DTRACE_PROBE(hotspot, vm__init__end); |
4006 | 3390 #else /* USDT2 */ |
3391 HOTSPOT_VM_INIT_END(); | |
3392 #endif /* USDT2 */ | |
0 | 3393 |
3394 // record VM initialization completion time | |
3395 Management::record_vm_init_completed(); | |
3396 | |
3397 // Compute system loader. Note that this has to occur after set_init_completed, since | |
3398 // valid exceptions may be thrown in the process. | |
3399 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
3400 // set_init_completed has just been called, causing exceptions not to be shortcut | |
3401 // anymore. We call vm_exit_during_initialization directly instead. | |
3402 SystemDictionary::compute_java_system_loader(THREAD); | |
3403 if (HAS_PENDING_EXCEPTION) { | |
3404 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3405 } | |
3406 | |
3407 #ifndef SERIALGC | |
3408 // Support for ConcurrentMarkSweep. This should be cleaned up | |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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diff
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|
3409 // and better encapsulated. The ugly nested if test would go away |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
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62
diff
changeset
|
3410 // once things are properly refactored. XXX YSR |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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diff
changeset
|
3411 if (UseConcMarkSweepGC || UseG1GC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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62
diff
changeset
|
3412 if (UseConcMarkSweepGC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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62
diff
changeset
|
3413 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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62
diff
changeset
|
3414 } else { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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62
diff
changeset
|
3415 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
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6711316: Open source the Garbage-First garbage collector
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diff
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|
3416 } |
0 | 3417 if (HAS_PENDING_EXCEPTION) { |
3418 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3419 } | |
3420 } | |
3421 #endif // SERIALGC | |
3422 | |
3423 // Always call even when there are not JVMTI environments yet, since environments | |
3424 // may be attached late and JVMTI must track phases of VM execution | |
3425 JvmtiExport::enter_live_phase(); | |
3426 | |
3427 // Signal Dispatcher needs to be started before VMInit event is posted | |
3428 os::signal_init(); | |
3429 | |
3430 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
3431 if (!DisableAttachMechanism) { | |
3432 if (StartAttachListener || AttachListener::init_at_startup()) { | |
3433 AttachListener::init(); | |
3434 } | |
3435 } | |
3436 | |
3437 // Launch -Xrun agents | |
3438 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
3439 // back-end can launch with -Xdebug -Xrunjdwp. | |
3440 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3441 create_vm_init_libraries(); | |
3442 } | |
3443 | |
4800
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
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4095
diff
changeset
|
3444 if (!TRACE_START()) { |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
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4095
diff
changeset
|
3445 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
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4095
diff
changeset
|
3446 } |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
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4095
diff
changeset
|
3447 |
0 | 3448 // Notify JVMTI agents that VM initialization is complete - nop if no agents. |
3449 JvmtiExport::post_vm_initialized(); | |
3450 | |
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3451 if (CleanChunkPoolAsync) { |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3452 Chunk::start_chunk_pool_cleaner_task(); |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
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3769
diff
changeset
|
3453 } |
0 | 3454 |
3455 // initialize compiler(s) | |
3456 CompileBroker::compilation_init(); | |
3457 | |
3458 Management::initialize(THREAD); | |
3459 if (HAS_PENDING_EXCEPTION) { | |
3460 // management agent fails to start possibly due to | |
3461 // configuration problem and is responsible for printing | |
3462 // stack trace if appropriate. Simply exit VM. | |
3463 vm_exit(1); | |
3464 } | |
3465 | |
3466 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
3467 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
3468 if (MemProfiling) MemProfiler::engage(); | |
3469 StatSampler::engage(); | |
3470 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
3471 | |
3472 BiasedLocking::init(); | |
3473 | |
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
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2126
diff
changeset
|
3474 if (JDK_Version::current().post_vm_init_hook_enabled()) { |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
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2126
diff
changeset
|
3475 call_postVMInitHook(THREAD); |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
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2126
diff
changeset
|
3476 // 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
|
3477 // exceptions and provide means of diagnosis. |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
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2126
diff
changeset
|
3478 if (HAS_PENDING_EXCEPTION) { |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
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diff
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|
3479 CLEAR_PENDING_EXCEPTION; |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
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2126
diff
changeset
|
3480 } |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
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|
3481 } |
0 | 3482 |
3483 // Start up the WatcherThread if there are any periodic tasks | |
3484 // NOTE: All PeriodicTasks should be registered by now. If they | |
3485 // aren't, late joiners might appear to start slowly (we might | |
3486 // take a while to process their first tick). | |
3487 if (PeriodicTask::num_tasks() > 0) { | |
3488 WatcherThread::start(); | |
3489 } | |
3490 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3491 // Give os specific code one last chance to start |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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1608
diff
changeset
|
3492 os::init_3(); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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parents:
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diff
changeset
|
3493 |
0 | 3494 create_vm_timer.end(); |
3495 return JNI_OK; | |
3496 } | |
3497 | |
3498 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
3499 extern "C" { | |
3500 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
3501 } | |
3502 // Find a command line agent library and return its entry point for | |
3503 // -agentlib: -agentpath: -Xrun | |
3504 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
3505 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
3506 OnLoadEntry_t on_load_entry = NULL; | |
3507 void *library = agent->os_lib(); // check if we have looked it up before | |
3508 | |
3509 if (library == NULL) { | |
3510 char buffer[JVM_MAXPATHLEN]; | |
3511 char ebuf[1024]; | |
3512 const char *name = agent->name(); | |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
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diff
changeset
|
3513 const char *msg = "Could not find agent library "; |
0 | 3514 |
3515 if (agent->is_absolute_path()) { | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
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1972
diff
changeset
|
3516 library = os::dll_load(name, ebuf, sizeof ebuf); |
0 | 3517 if (library == NULL) { |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
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changeset
|
3518 const char *sub_msg = " in absolute path, with error: "; |
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
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changeset
|
3519 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.
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changeset
|
3520 char *buf = NEW_C_HEAP_ARRAY(char, len); |
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
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changeset
|
3521 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3522 // 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:
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diff
changeset
|
3523 vm_exit_during_initialization(buf, NULL); |
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3524 FREE_C_HEAP_ARRAY(char, buf); |
0 | 3525 } |
3526 } else { | |
3527 // Try to load the agent from the standard dll directory | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3528 os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), name); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3529 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3530 #ifdef KERNEL |
3531 // Download instrument dll | |
3532 if (library == NULL && strcmp(name, "instrument") == 0) { | |
3533 char *props = Arguments::get_kernel_properties(); | |
3534 char *home = Arguments::get_java_home(); | |
3535 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
3536 " sun.jkernel.DownloadManager -download client_jvm"; | |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
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diff
changeset
|
3537 size_t length = strlen(props) + strlen(home) + strlen(fmt) + 1; |
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3538 char *cmd = NEW_C_HEAP_ARRAY(char, length); |
0 | 3539 jio_snprintf(cmd, length, fmt, home, props); |
3540 int status = os::fork_and_exec(cmd); | |
3541 FreeHeap(props); | |
3542 if (status == -1) { | |
3543 warning(cmd); | |
3544 vm_exit_during_initialization("fork_and_exec failed: %s", | |
3545 strerror(errno)); | |
3546 } | |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3547 FREE_C_HEAP_ARRAY(char, cmd); |
0 | 3548 // when this comes back the instrument.dll should be where it belongs. |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3549 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3550 } |
3551 #endif // KERNEL | |
3552 if (library == NULL) { // Try the local directory | |
3553 char ns[1] = {0}; | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3554 os::dll_build_name(buffer, sizeof(buffer), ns, name); |
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3555 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3556 if (library == NULL) { |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3557 const char *sub_msg = " on the library path, with error: "; |
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3558 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
|
3559 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
|
3560 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3561 // 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
|
3562 vm_exit_during_initialization(buf, NULL); |
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3563 FREE_C_HEAP_ARRAY(char, buf); |
0 | 3564 } |
3565 } | |
3566 } | |
3567 agent->set_os_lib(library); | |
3568 } | |
3569 | |
3570 // Find the OnLoad function. | |
3571 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3572 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, os::dll_lookup(library, on_load_symbols[symbol_index])); |
0 | 3573 if (on_load_entry != NULL) break; |
3574 } | |
3575 return on_load_entry; | |
3576 } | |
3577 | |
3578 // Find the JVM_OnLoad entry point | |
3579 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
3580 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
3581 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3582 } | |
3583 | |
3584 // Find the Agent_OnLoad entry point | |
3585 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
3586 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
3587 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3588 } | |
3589 | |
3590 // For backwards compatibility with -Xrun | |
3591 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
3592 // treated like -agentpath: | |
3593 // Must be called before agent libraries are created | |
3594 void Threads::convert_vm_init_libraries_to_agents() { | |
3595 AgentLibrary* agent; | |
3596 AgentLibrary* next; | |
3597 | |
3598 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
3599 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
3600 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3601 | |
3602 // If there is an JVM_OnLoad function it will get called later, | |
3603 // otherwise see if there is an Agent_OnLoad | |
3604 if (on_load_entry == NULL) { | |
3605 on_load_entry = lookup_agent_on_load(agent); | |
3606 if (on_load_entry != NULL) { | |
3607 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
3608 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
3609 Arguments::convert_library_to_agent(agent); | |
3610 } else { | |
3611 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
3612 } | |
3613 } | |
3614 } | |
3615 } | |
3616 | |
3617 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
3618 // Invokes Agent_OnLoad | |
3619 // Called very early -- before JavaThreads exist | |
3620 void Threads::create_vm_init_agents() { | |
3621 extern struct JavaVM_ main_vm; | |
3622 AgentLibrary* agent; | |
3623 | |
3624 JvmtiExport::enter_onload_phase(); | |
3625 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3626 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
3627 | |
3628 if (on_load_entry != NULL) { | |
3629 // Invoke the Agent_OnLoad function | |
3630 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3631 if (err != JNI_OK) { | |
3632 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
3633 } | |
3634 } else { | |
3635 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
3636 } | |
3637 } | |
3638 JvmtiExport::enter_primordial_phase(); | |
3639 } | |
3640 | |
3641 extern "C" { | |
3642 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
3643 } | |
3644 | |
3645 void Threads::shutdown_vm_agents() { | |
3646 // Send any Agent_OnUnload notifications | |
3647 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
3648 extern struct JavaVM_ main_vm; | |
3649 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3650 | |
3651 // Find the Agent_OnUnload function. | |
3652 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
3653 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3654 os::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
0 | 3655 |
3656 // Invoke the Agent_OnUnload function | |
3657 if (unload_entry != NULL) { | |
3658 JavaThread* thread = JavaThread::current(); | |
3659 ThreadToNativeFromVM ttn(thread); | |
3660 HandleMark hm(thread); | |
3661 (*unload_entry)(&main_vm); | |
3662 break; | |
3663 } | |
3664 } | |
3665 } | |
3666 } | |
3667 | |
3668 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
3669 // Invokes JVM_OnLoad | |
3670 void Threads::create_vm_init_libraries() { | |
3671 extern struct JavaVM_ main_vm; | |
3672 AgentLibrary* agent; | |
3673 | |
3674 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
3675 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3676 | |
3677 if (on_load_entry != NULL) { | |
3678 // Invoke the JVM_OnLoad function | |
3679 JavaThread* thread = JavaThread::current(); | |
3680 ThreadToNativeFromVM ttn(thread); | |
3681 HandleMark hm(thread); | |
3682 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3683 if (err != JNI_OK) { | |
3684 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
3685 } | |
3686 } else { | |
3687 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
3688 } | |
3689 } | |
3690 } | |
3691 | |
3692 // Last thread running calls java.lang.Shutdown.shutdown() | |
3693 void JavaThread::invoke_shutdown_hooks() { | |
3694 HandleMark hm(this); | |
3695 | |
3696 // We could get here with a pending exception, if so clear it now. | |
3697 if (this->has_pending_exception()) { | |
3698 this->clear_pending_exception(); | |
3699 } | |
3700 | |
3701 EXCEPTION_MARK; | |
3702 klassOop k = | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3703 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
0 | 3704 THREAD); |
3705 if (k != NULL) { | |
3706 // SystemDictionary::resolve_or_null will return null if there was | |
3707 // an exception. If we cannot load the Shutdown class, just don't | |
3708 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
3709 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
3710 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
3711 // was called, the Shutdown class would have already been loaded | |
3712 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
3713 instanceKlassHandle shutdown_klass (THREAD, k); | |
3714 JavaValue result(T_VOID); | |
3715 JavaCalls::call_static(&result, | |
3716 shutdown_klass, | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3717 vmSymbols::shutdown_method_name(), |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3718 vmSymbols::void_method_signature(), |
0 | 3719 THREAD); |
3720 } | |
3721 CLEAR_PENDING_EXCEPTION; | |
3722 } | |
3723 | |
3724 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
3725 // the program falls off the end of main(). Another VM exit path is through | |
3726 // vm_exit() when the program calls System.exit() to return a value or when | |
3727 // there is a serious error in VM. The two shutdown paths are not exactly | |
3728 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
3729 // and VM_Exit op at VM level. | |
3730 // | |
3731 // Shutdown sequence: | |
3732 // + Wait until we are the last non-daemon thread to execute | |
3733 // <-- every thing is still working at this moment --> | |
3734 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
3735 // shutdown hooks, run finalizers if finalization-on-exit | |
3736 // + Call before_exit(), prepare for VM exit | |
3737 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
3738 // currently the only user of this mechanism is File.deleteOnExit()) | |
3739 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
3740 // post thread end and vm death events to JVMTI, | |
3741 // stop signal thread | |
3742 // + Call JavaThread::exit(), it will: | |
3743 // > release JNI handle blocks, remove stack guard pages | |
3744 // > remove this thread from Threads list | |
3745 // <-- no more Java code from this thread after this point --> | |
3746 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
3747 // the compiler threads at safepoint | |
3748 // <-- do not use anything that could get blocked by Safepoint --> | |
3749 // + Disable tracing at JNI/JVM barriers | |
3750 // + Set _vm_exited flag for threads that are still running native code | |
3751 // + Delete this thread | |
3752 // + Call exit_globals() | |
3753 // > deletes tty | |
3754 // > deletes PerfMemory resources | |
3755 // + Return to caller | |
3756 | |
3757 bool Threads::destroy_vm() { | |
3758 JavaThread* thread = JavaThread::current(); | |
3759 | |
3760 // Wait until we are the last non-daemon thread to execute | |
3761 { MutexLocker nu(Threads_lock); | |
3762 while (Threads::number_of_non_daemon_threads() > 1 ) | |
3763 // This wait should make safepoint checks, wait without a timeout, | |
3764 // and wait as a suspend-equivalent condition. | |
3765 // | |
3766 // Note: If the FlatProfiler is running and this thread is waiting | |
3767 // for another non-daemon thread to finish, then the FlatProfiler | |
3768 // is waiting for the external suspend request on this thread to | |
3769 // complete. wait_for_ext_suspend_completion() will eventually | |
3770 // timeout, but that takes time. Making this wait a suspend- | |
3771 // equivalent condition solves that timeout problem. | |
3772 // | |
3773 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
3774 Mutex::_as_suspend_equivalent_flag); | |
3775 } | |
3776 | |
3777 // Hang forever on exit if we are reporting an error. | |
3778 if (ShowMessageBoxOnError && is_error_reported()) { | |
3779 os::infinite_sleep(); | |
3780 } | |
2302
da091bb67459
7022037: Pause when exiting if debugger is attached on windows
sla
parents:
2203
diff
changeset
|
3781 os::wait_for_keypress_at_exit(); |
0 | 3782 |
3783 if (JDK_Version::is_jdk12x_version()) { | |
3784 // We are the last thread running, so check if finalizers should be run. | |
3785 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
3786 HandleMark rm(thread); | |
3787 Universe::run_finalizers_on_exit(); | |
3788 } else { | |
3789 // run Java level shutdown hooks | |
3790 thread->invoke_shutdown_hooks(); | |
3791 } | |
3792 | |
3793 before_exit(thread); | |
3794 | |
3795 thread->exit(true); | |
3796 | |
3797 // Stop VM thread. | |
3798 { | |
3799 // 4945125 The vm thread comes to a safepoint during exit. | |
3800 // GC vm_operations can get caught at the safepoint, and the | |
3801 // heap is unparseable if they are caught. Grab the Heap_lock | |
3802 // to prevent this. The GC vm_operations will not be able to | |
3803 // queue until after the vm thread is dead. | |
3769
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3804 // After this point, we'll never emerge out of the safepoint before |
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3805 // the VM exits, so concurrent GC threads do not need to be explicitly |
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3806 // stopped; they remain inactive until the process exits. |
ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
ysr
parents:
3388
diff
changeset
|
3807 // Note: some concurrent G1 threads may be running during a safepoint, |
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3808 // but these will not be accessing the heap, just some G1-specific side |
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3809 // data structures that are not accessed by any other threads but them |
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3810 // after this point in a terminal safepoint. |
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3811 |
0 | 3812 MutexLocker ml(Heap_lock); |
3813 | |
3814 VMThread::wait_for_vm_thread_exit(); | |
3815 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
3816 VMThread::destroy(); | |
3817 } | |
3818 | |
3819 // clean up ideal graph printers | |
3820 #if defined(COMPILER2) && !defined(PRODUCT) | |
3821 IdealGraphPrinter::clean_up(); | |
3822 #endif | |
3823 | |
3824 // Now, all Java threads are gone except daemon threads. Daemon threads | |
3825 // running Java code or in VM are stopped by the Safepoint. However, | |
3826 // daemon threads executing native code are still running. But they | |
3827 // will be stopped at native=>Java/VM barriers. Note that we can't | |
3828 // simply kill or suspend them, as it is inherently deadlock-prone. | |
3829 | |
3830 #ifndef PRODUCT | |
3831 // disable function tracing at JNI/JVM barriers | |
3832 TraceJNICalls = false; | |
3833 TraceJVMCalls = false; | |
3834 TraceRuntimeCalls = false; | |
3835 #endif | |
3836 | |
3837 VM_Exit::set_vm_exited(); | |
3838 | |
3839 notify_vm_shutdown(); | |
3840 | |
3841 delete thread; | |
3842 | |
3843 // exit_globals() will delete tty | |
3844 exit_globals(); | |
3845 | |
3846 return true; | |
3847 } | |
3848 | |
3849 | |
3850 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
3851 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
3852 return is_supported_jni_version(version); | |
3853 } | |
3854 | |
3855 | |
3856 jboolean Threads::is_supported_jni_version(jint version) { | |
3857 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
3858 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
3859 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
3860 return JNI_FALSE; | |
3861 } | |
3862 | |
3863 | |
3864 void Threads::add(JavaThread* p, bool force_daemon) { | |
3865 // The threads lock must be owned at this point | |
3866 assert_locked_or_safepoint(Threads_lock); | |
1842
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3867 |
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3868 // See the comment for this method in thread.hpp for its purpose and |
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3869 // why it is called here. |
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3870 p->initialize_queues(); |
0 | 3871 p->set_next(_thread_list); |
3872 _thread_list = p; | |
3873 _number_of_threads++; | |
3874 oop threadObj = p->threadObj(); | |
3875 bool daemon = true; | |
3876 // Bootstrapping problem: threadObj can be null for initial | |
3877 // JavaThread (or for threads attached via JNI) | |
3878 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
3879 _number_of_non_daemon_threads++; | |
3880 daemon = false; | |
3881 } | |
3882 | |
3883 ThreadService::add_thread(p, daemon); | |
3884 | |
3885 // Possible GC point. | |
4872
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3886 Events::log(p, "Thread added: " INTPTR_FORMAT, p); |
0 | 3887 } |
3888 | |
3889 void Threads::remove(JavaThread* p) { | |
3890 // Extra scope needed for Thread_lock, so we can check | |
3891 // that we do not remove thread without safepoint code notice | |
3892 { MutexLocker ml(Threads_lock); | |
3893 | |
3894 assert(includes(p), "p must be present"); | |
3895 | |
3896 JavaThread* current = _thread_list; | |
3897 JavaThread* prev = NULL; | |
3898 | |
3899 while (current != p) { | |
3900 prev = current; | |
3901 current = current->next(); | |
3902 } | |
3903 | |
3904 if (prev) { | |
3905 prev->set_next(current->next()); | |
3906 } else { | |
3907 _thread_list = p->next(); | |
3908 } | |
3909 _number_of_threads--; | |
3910 oop threadObj = p->threadObj(); | |
3911 bool daemon = true; | |
3912 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
3913 _number_of_non_daemon_threads--; | |
3914 daemon = false; | |
3915 | |
3916 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
3917 // on destroy_vm will wake up. | |
3918 if (number_of_non_daemon_threads() == 1) | |
3919 Threads_lock->notify_all(); | |
3920 } | |
3921 ThreadService::remove_thread(p, daemon); | |
3922 | |
3923 // Make sure that safepoint code disregard this thread. This is needed since | |
3924 // the thread might mess around with locks after this point. This can cause it | |
3925 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
3926 // of this thread since it is removed from the queue. | |
3927 p->set_terminated_value(); | |
3928 } // unlock Threads_lock | |
3929 | |
3930 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
4872
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3931 Events::log(p, "Thread exited: " INTPTR_FORMAT, p); |
0 | 3932 } |
3933 | |
3934 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
3935 bool Threads::includes(JavaThread* p) { | |
3936 assert(Threads_lock->is_locked(), "sanity check"); | |
3937 ALL_JAVA_THREADS(q) { | |
3938 if (q == p ) { | |
3939 return true; | |
3940 } | |
3941 } | |
3942 return false; | |
3943 } | |
3944 | |
3945 // Operations on the Threads list for GC. These are not explicitly locked, | |
3946 // but the garbage collector must provide a safe context for them to run. | |
3947 // In particular, these things should never be called when the Threads_lock | |
3948 // is held by some other thread. (Note: the Safepoint abstraction also | |
3949 // uses the Threads_lock to gurantee this property. It also makes sure that | |
3950 // all threads gets blocked when exiting or starting). | |
3951 | |
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3952 void Threads::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 3953 ALL_JAVA_THREADS(p) { |
989
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3954 p->oops_do(f, cf); |
0 | 3955 } |
989
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3956 VMThread::vm_thread()->oops_do(f, cf); |
0 | 3957 } |
3958 | |
989
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3959 void Threads::possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 3960 // Introduce a mechanism allowing parallel threads to claim threads as |
3961 // root groups. Overhead should be small enough to use all the time, | |
3962 // even in sequential code. | |
3963 SharedHeap* sh = SharedHeap::heap(); | |
4095
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3964 // Cannot yet substitute active_workers for n_par_threads |
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3965 // because of G1CollectedHeap::verify() use of |
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3966 // SharedHeap::process_strong_roots(). n_par_threads == 0 will |
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3967 // turn off parallelism in process_strong_roots while active_workers |
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3968 // is being used for parallelism elsewhere. |
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3969 bool is_par = sh->n_par_threads() > 0; |
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3970 assert(!is_par || |
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3971 (SharedHeap::heap()->n_par_threads() == |
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3972 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
0 | 3973 int cp = SharedHeap::heap()->strong_roots_parity(); |
3974 ALL_JAVA_THREADS(p) { | |
3975 if (p->claim_oops_do(is_par, cp)) { | |
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3976 p->oops_do(f, cf); |
0 | 3977 } |
3978 } | |
3979 VMThread* vmt = VMThread::vm_thread(); | |
3979
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6484982: G1: process references during evacuation pauses
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3980 if (vmt->claim_oops_do(is_par, cp)) { |
989
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3981 vmt->oops_do(f, cf); |
3979
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3982 } |
0 | 3983 } |
3984 | |
3985 #ifndef SERIALGC | |
3986 // Used by ParallelScavenge | |
3987 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
3988 ALL_JAVA_THREADS(p) { | |
3989 q->enqueue(new ThreadRootsTask(p)); | |
3990 } | |
3991 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
3992 } | |
3993 | |
3994 // Used by Parallel Old | |
3995 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
3996 ALL_JAVA_THREADS(p) { | |
3997 q->enqueue(new ThreadRootsMarkingTask(p)); | |
3998 } | |
3999 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
4000 } | |
4001 #endif // SERIALGC | |
4002 | |
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4003 void Threads::nmethods_do(CodeBlobClosure* cf) { |
0 | 4004 ALL_JAVA_THREADS(p) { |
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4005 p->nmethods_do(cf); |
0 | 4006 } |
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4007 VMThread::vm_thread()->nmethods_do(cf); |
0 | 4008 } |
4009 | |
4010 void Threads::gc_epilogue() { | |
4011 ALL_JAVA_THREADS(p) { | |
4012 p->gc_epilogue(); | |
4013 } | |
4014 } | |
4015 | |
4016 void Threads::gc_prologue() { | |
4017 ALL_JAVA_THREADS(p) { | |
4018 p->gc_prologue(); | |
4019 } | |
4020 } | |
4021 | |
4022 void Threads::deoptimized_wrt_marked_nmethods() { | |
4023 ALL_JAVA_THREADS(p) { | |
4024 p->deoptimized_wrt_marked_nmethods(); | |
4025 } | |
4026 } | |
4027 | |
4028 | |
4029 // Get count Java threads that are waiting to enter the specified monitor. | |
4030 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
4031 address monitor, bool doLock) { | |
4032 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
4033 "must grab Threads_lock or be at safepoint"); | |
4034 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
4035 | |
4036 int i = 0; | |
4037 { | |
4038 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4039 ALL_JAVA_THREADS(p) { | |
4040 if (p->is_Compiler_thread()) continue; | |
4041 | |
4042 address pending = (address)p->current_pending_monitor(); | |
4043 if (pending == monitor) { // found a match | |
4044 if (i < count) result->append(p); // save the first count matches | |
4045 i++; | |
4046 } | |
4047 } | |
4048 } | |
4049 return result; | |
4050 } | |
4051 | |
4052 | |
4053 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
4054 assert(doLock || | |
4055 Threads_lock->owned_by_self() || | |
4056 SafepointSynchronize::is_at_safepoint(), | |
4057 "must grab Threads_lock or be at safepoint"); | |
4058 | |
4059 // NULL owner means not locked so we can skip the search | |
4060 if (owner == NULL) return NULL; | |
4061 | |
4062 { | |
4063 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4064 ALL_JAVA_THREADS(p) { | |
4065 // first, see if owner is the address of a Java thread | |
4066 if (owner == (address)p) return p; | |
4067 } | |
4068 } | |
4069 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
4070 if (UseHeavyMonitors) return NULL; | |
4071 | |
4072 // | |
4073 // If we didn't find a matching Java thread and we didn't force use of | |
4074 // heavyweight monitors, then the owner is the stack address of the | |
4075 // Lock Word in the owning Java thread's stack. | |
4076 // | |
4077 JavaThread* the_owner = NULL; | |
4078 { | |
4079 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4080 ALL_JAVA_THREADS(q) { | |
702
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4081 if (q->is_lock_owned(owner)) { |
0 | 4082 the_owner = q; |
702
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4083 break; |
0 | 4084 } |
4085 } | |
4086 } | |
4087 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
4088 return the_owner; | |
4089 } | |
4090 | |
4091 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
4092 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
4093 char buf[32]; | |
4094 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
4095 | |
4096 st->print_cr("Full thread dump %s (%s %s):", | |
4097 Abstract_VM_Version::vm_name(), | |
4098 Abstract_VM_Version::vm_release(), | |
4099 Abstract_VM_Version::vm_info_string() | |
4100 ); | |
4101 st->cr(); | |
4102 | |
4103 #ifndef SERIALGC | |
4104 // Dump concurrent locks | |
4105 ConcurrentLocksDump concurrent_locks; | |
4106 if (print_concurrent_locks) { | |
4107 concurrent_locks.dump_at_safepoint(); | |
4108 } | |
4109 #endif // SERIALGC | |
4110 | |
4111 ALL_JAVA_THREADS(p) { | |
4112 ResourceMark rm; | |
4113 p->print_on(st); | |
4114 if (print_stacks) { | |
4115 if (internal_format) { | |
4116 p->trace_stack(); | |
4117 } else { | |
4118 p->print_stack_on(st); | |
4119 } | |
4120 } | |
4121 st->cr(); | |
4122 #ifndef SERIALGC | |
4123 if (print_concurrent_locks) { | |
4124 concurrent_locks.print_locks_on(p, st); | |
4125 } | |
4126 #endif // SERIALGC | |
4127 } | |
4128 | |
4129 VMThread::vm_thread()->print_on(st); | |
4130 st->cr(); | |
4131 Universe::heap()->print_gc_threads_on(st); | |
4132 WatcherThread* wt = WatcherThread::watcher_thread(); | |
4133 if (wt != NULL) wt->print_on(st); | |
4134 st->cr(); | |
4135 CompileBroker::print_compiler_threads_on(st); | |
4136 st->flush(); | |
4137 } | |
4138 | |
4139 // Threads::print_on_error() is called by fatal error handler. It's possible | |
4140 // that VM is not at safepoint and/or current thread is inside signal handler. | |
4141 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
4142 // memory (even in resource area), it might deadlock the error handler. | |
4143 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
4144 bool found_current = false; | |
4145 st->print_cr("Java Threads: ( => current thread )"); | |
4146 ALL_JAVA_THREADS(thread) { | |
4147 bool is_current = (current == thread); | |
4148 found_current = found_current || is_current; | |
4149 | |
4150 st->print("%s", is_current ? "=>" : " "); | |
4151 | |
4152 st->print(PTR_FORMAT, thread); | |
4153 st->print(" "); | |
4154 thread->print_on_error(st, buf, buflen); | |
4155 st->cr(); | |
4156 } | |
4157 st->cr(); | |
4158 | |
4159 st->print_cr("Other Threads:"); | |
4160 if (VMThread::vm_thread()) { | |
4161 bool is_current = (current == VMThread::vm_thread()); | |
4162 found_current = found_current || is_current; | |
4163 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
4164 | |
4165 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
4166 st->print(" "); | |
4167 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
4168 st->cr(); | |
4169 } | |
4170 WatcherThread* wt = WatcherThread::watcher_thread(); | |
4171 if (wt != NULL) { | |
4172 bool is_current = (current == wt); | |
4173 found_current = found_current || is_current; | |
4174 st->print("%s", is_current ? "=>" : " "); | |
4175 | |
4176 st->print(PTR_FORMAT, wt); | |
4177 st->print(" "); | |
4178 wt->print_on_error(st, buf, buflen); | |
4179 st->cr(); | |
4180 } | |
4181 if (!found_current) { | |
4182 st->cr(); | |
4183 st->print("=>" PTR_FORMAT " (exited) ", current); | |
4184 current->print_on_error(st, buf, buflen); | |
4185 st->cr(); | |
4186 } | |
4187 } | |
4188 | |
1878 | 4189 // Internal SpinLock and Mutex |
4190 // Based on ParkEvent | |
4191 | |
4192 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
0 | 4193 // |
1878 | 4194 // We employ SpinLocks _only for low-contention, fixed-length |
4195 // short-duration critical sections where we're concerned | |
4196 // about native mutex_t or HotSpot Mutex:: latency. | |
4197 // The mux construct provides a spin-then-block mutual exclusion | |
4198 // mechanism. | |
4199 // | |
4200 // Testing has shown that contention on the ListLock guarding gFreeList | |
4201 // is common. If we implement ListLock as a simple SpinLock it's common | |
4202 // for the JVM to devolve to yielding with little progress. This is true | |
4203 // despite the fact that the critical sections protected by ListLock are | |
4204 // extremely short. | |
0 | 4205 // |
1878 | 4206 // TODO-FIXME: ListLock should be of type SpinLock. |
4207 // We should make this a 1st-class type, integrated into the lock | |
4208 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
4209 // should have sufficient padding to avoid false-sharing and excessive | |
4210 // cache-coherency traffic. | |
4211 | |
4212 | |
4213 typedef volatile int SpinLockT ; | |
4214 | |
4215 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
4216 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
4217 return ; // normal fast-path return | |
4218 } | |
4219 | |
4220 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
4221 TEVENT (SpinAcquire - ctx) ; | |
4222 int ctr = 0 ; | |
4223 int Yields = 0 ; | |
0 | 4224 for (;;) { |
1878 | 4225 while (*adr != 0) { |
4226 ++ctr ; | |
4227 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
4228 if (Yields > 5) { | |
4229 // Consider using a simple NakedSleep() instead. | |
4230 // Then SpinAcquire could be called by non-JVM threads | |
4231 Thread::current()->_ParkEvent->park(1) ; | |
4232 } else { | |
4233 os::NakedYield() ; | |
4234 ++Yields ; | |
4235 } | |
4236 } else { | |
4237 SpinPause() ; | |
0 | 4238 } |
1878 | 4239 } |
4240 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
0 | 4241 } |
4242 } | |
4243 | |
1878 | 4244 void Thread::SpinRelease (volatile int * adr) { |
4245 assert (*adr != 0, "invariant") ; | |
4246 OrderAccess::fence() ; // guarantee at least release consistency. | |
4247 // Roach-motel semantics. | |
4248 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
4249 // but prior LDs and STs within the critical section can't be allowed | |
4250 // to reorder or float past the ST that releases the lock. | |
4251 *adr = 0 ; | |
0 | 4252 } |
4253 | |
1878 | 4254 // muxAcquire and muxRelease: |
4255 // | |
4256 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
4257 // The LSB of the word is set IFF the lock is held. | |
4258 // The remainder of the word points to the head of a singly-linked list | |
4259 // of threads blocked on the lock. | |
4260 // | |
4261 // * The current implementation of muxAcquire-muxRelease uses its own | |
4262 // dedicated Thread._MuxEvent instance. If we're interested in | |
4263 // minimizing the peak number of extant ParkEvent instances then | |
4264 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
4265 // as certain invariants were satisfied. Specifically, care would need | |
4266 // to be taken with regards to consuming unpark() "permits". | |
4267 // A safe rule of thumb is that a thread would never call muxAcquire() | |
4268 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
4269 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
4270 // consume an unpark() permit intended for monitorenter, for instance. | |
4271 // One way around this would be to widen the restricted-range semaphore | |
4272 // implemented in park(). Another alternative would be to provide | |
4273 // multiple instances of the PlatformEvent() for each thread. One | |
4274 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
4275 // | |
4276 // * Usage: | |
4277 // -- Only as leaf locks | |
4278 // -- for short-term locking only as muxAcquire does not perform | |
4279 // thread state transitions. | |
4280 // | |
4281 // Alternatives: | |
4282 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
4283 // but with parking or spin-then-park instead of pure spinning. | |
4284 // * Use Taura-Oyama-Yonenzawa locks. | |
4285 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
4286 // (List,LockByte). Acquire will CAS the full lockword while Release | |
4287 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
4288 // acquiring threads use timers (ParkTimed) to detect and recover from | |
4289 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
4290 // boundaries by using placement-new. | |
4291 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
4292 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
4293 // The validity of the backlinks must be ratified before we trust the value. | |
4294 // If the backlinks are invalid the exiting thread must back-track through the | |
4295 // the forward links, which are always trustworthy. | |
4296 // * Add a successor indication. The LockWord is currently encoded as | |
4297 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
4298 // to provide the usual futile-wakeup optimization. | |
4299 // See RTStt for details. | |
4300 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
4301 // | |
4302 | |
4303 | |
4304 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
4305 enum MuxBits { LOCKBIT = 1 } ; | |
4306 | |
4307 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
4308 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4309 if (w == 0) return ; | |
4310 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4311 return ; | |
4312 } | |
4313 | |
4314 TEVENT (muxAcquire - Contention) ; | |
4315 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
4316 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
0 | 4317 for (;;) { |
1878 | 4318 int its = (os::is_MP() ? 100 : 0) + 1 ; |
4319 | |
4320 // Optional spin phase: spin-then-park strategy | |
4321 while (--its >= 0) { | |
4322 w = *Lock ; | |
4323 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4324 return ; | |
4325 } | |
4326 } | |
4327 | |
4328 Self->reset() ; | |
4329 Self->OnList = intptr_t(Lock) ; | |
4330 // The following fence() isn't _strictly necessary as the subsequent | |
4331 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4332 OrderAccess::fence(); | |
4333 for (;;) { | |
4334 w = *Lock ; | |
4335 if ((w & LOCKBIT) == 0) { | |
4336 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4337 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
4338 return ; | |
4339 } | |
4340 continue ; // Interference -- *Lock changed -- Just retry | |
0 | 4341 } |
1878 | 4342 assert (w & LOCKBIT, "invariant") ; |
4343 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4344 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
4345 } | |
4346 | |
4347 while (Self->OnList != 0) { | |
4348 Self->park() ; | |
4349 } | |
0 | 4350 } |
4351 } | |
4352 | |
1878 | 4353 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
4354 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4355 if (w == 0) return ; | |
4356 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4357 return ; | |
4358 } | |
4359 | |
4360 TEVENT (muxAcquire - Contention) ; | |
4361 ParkEvent * ReleaseAfter = NULL ; | |
4362 if (ev == NULL) { | |
4363 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
4364 } | |
4365 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
4366 for (;;) { | |
4367 guarantee (ev->OnList == 0, "invariant") ; | |
4368 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
4369 | |
4370 // Optional spin phase: spin-then-park strategy | |
4371 while (--its >= 0) { | |
4372 w = *Lock ; | |
4373 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4374 if (ReleaseAfter != NULL) { | |
4375 ParkEvent::Release (ReleaseAfter) ; | |
4376 } | |
4377 return ; | |
4378 } | |
4379 } | |
4380 | |
4381 ev->reset() ; | |
4382 ev->OnList = intptr_t(Lock) ; | |
4383 // The following fence() isn't _strictly necessary as the subsequent | |
4384 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4385 OrderAccess::fence(); | |
4386 for (;;) { | |
4387 w = *Lock ; | |
4388 if ((w & LOCKBIT) == 0) { | |
4389 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4390 ev->OnList = 0 ; | |
4391 // We call ::Release while holding the outer lock, thus | |
4392 // artificially lengthening the critical section. | |
4393 // Consider deferring the ::Release() until the subsequent unlock(), | |
4394 // after we've dropped the outer lock. | |
4395 if (ReleaseAfter != NULL) { | |
4396 ParkEvent::Release (ReleaseAfter) ; | |
4397 } | |
4398 return ; | |
4399 } | |
4400 continue ; // Interference -- *Lock changed -- Just retry | |
4401 } | |
4402 assert (w & LOCKBIT, "invariant") ; | |
4403 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4404 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
4405 } | |
4406 | |
4407 while (ev->OnList != 0) { | |
4408 ev->park() ; | |
4409 } | |
4410 } | |
4411 } | |
4412 | |
4413 // Release() must extract a successor from the list and then wake that thread. | |
4414 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
4415 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
4416 // Release() would : | |
4417 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
4418 // (B) Extract a successor from the private list "in-hand" | |
4419 // (C) attempt to CAS() the residual back into *Lock over null. | |
4420 // If there were any newly arrived threads and the CAS() would fail. | |
4421 // In that case Release() would detach the RATs, re-merge the list in-hand | |
4422 // with the RATs and repeat as needed. Alternately, Release() might | |
4423 // detach and extract a successor, but then pass the residual list to the wakee. | |
4424 // The wakee would be responsible for reattaching and remerging before it | |
4425 // competed for the lock. | |
4426 // | |
4427 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
4428 // multiple concurrent pushers, but only one popper or detacher. | |
4429 // This implementation pops from the head of the list. This is unfair, | |
4430 // but tends to provide excellent throughput as hot threads remain hot. | |
4431 // (We wake recently run threads first). | |
4432 | |
4433 void Thread::muxRelease (volatile intptr_t * Lock) { | |
4434 for (;;) { | |
4435 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
4436 assert (w & LOCKBIT, "invariant") ; | |
4437 if (w == LOCKBIT) return ; | |
4438 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
4439 assert (List != NULL, "invariant") ; | |
4440 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
4441 ParkEvent * nxt = List->ListNext ; | |
4442 | |
4443 // The following CAS() releases the lock and pops the head element. | |
4444 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
4445 continue ; | |
4446 } | |
4447 List->OnList = 0 ; | |
4448 OrderAccess::fence() ; | |
4449 List->unpark () ; | |
4450 return ; | |
4451 } | |
4452 } | |
4453 | |
4454 | |
0 | 4455 void Threads::verify() { |
4456 ALL_JAVA_THREADS(p) { | |
4457 p->verify(); | |
4458 } | |
4459 VMThread* thread = VMThread::vm_thread(); | |
4460 if (thread != NULL) thread->verify(); | |
4461 } |