Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/thread.cpp @ 4712:e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
Summary: Replaces calls to os::javaTimeMillis(), which does not (and cannot) guarantee monotonicity, in GC code to an equivalent expression that uses os::javaTimeNanos(). os::javaTimeNanos is guaranteed monotonically non-decreasing if the underlying platform provides a monotonic time source. Changes in OS files are to make use of the newly defined constants in globalDefinitions.hpp.
Reviewed-by: dholmes, ysr
author | johnc |
---|---|
date | Mon, 19 Dec 2011 10:02:05 -0800 |
parents | bca17e38de00 |
children | 04b9a2566eec 94ec88ca68e2 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/classLoader.hpp" | |
27 #include "classfile/javaClasses.hpp" | |
28 #include "classfile/systemDictionary.hpp" | |
29 #include "classfile/vmSymbols.hpp" | |
30 #include "code/scopeDesc.hpp" | |
31 #include "compiler/compileBroker.hpp" | |
32 #include "interpreter/interpreter.hpp" | |
33 #include "interpreter/linkResolver.hpp" | |
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34 #include "interpreter/oopMapCache.hpp" |
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35 #include "jvmtifiles/jvmtiEnv.hpp" |
1972 | 36 #include "memory/oopFactory.hpp" |
37 #include "memory/universe.inline.hpp" | |
38 #include "oops/instanceKlass.hpp" | |
39 #include "oops/objArrayOop.hpp" | |
40 #include "oops/oop.inline.hpp" | |
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41 #include "oops/symbol.hpp" |
1972 | 42 #include "prims/jvm_misc.hpp" |
43 #include "prims/jvmtiExport.hpp" | |
44 #include "prims/jvmtiThreadState.hpp" | |
45 #include "prims/privilegedStack.hpp" | |
46 #include "runtime/aprofiler.hpp" | |
47 #include "runtime/arguments.hpp" | |
48 #include "runtime/biasedLocking.hpp" | |
49 #include "runtime/deoptimization.hpp" | |
50 #include "runtime/fprofiler.hpp" | |
51 #include "runtime/frame.inline.hpp" | |
52 #include "runtime/init.hpp" | |
53 #include "runtime/interfaceSupport.hpp" | |
54 #include "runtime/java.hpp" | |
55 #include "runtime/javaCalls.hpp" | |
56 #include "runtime/jniPeriodicChecker.hpp" | |
57 #include "runtime/memprofiler.hpp" | |
58 #include "runtime/mutexLocker.hpp" | |
59 #include "runtime/objectMonitor.hpp" | |
60 #include "runtime/osThread.hpp" | |
61 #include "runtime/safepoint.hpp" | |
62 #include "runtime/sharedRuntime.hpp" | |
63 #include "runtime/statSampler.hpp" | |
64 #include "runtime/stubRoutines.hpp" | |
65 #include "runtime/task.hpp" | |
66 #include "runtime/threadCritical.hpp" | |
67 #include "runtime/threadLocalStorage.hpp" | |
68 #include "runtime/vframe.hpp" | |
69 #include "runtime/vframeArray.hpp" | |
70 #include "runtime/vframe_hp.hpp" | |
71 #include "runtime/vmThread.hpp" | |
72 #include "runtime/vm_operations.hpp" | |
73 #include "services/attachListener.hpp" | |
74 #include "services/management.hpp" | |
75 #include "services/threadService.hpp" | |
76 #include "utilities/defaultStream.hpp" | |
77 #include "utilities/dtrace.hpp" | |
78 #include "utilities/events.hpp" | |
79 #include "utilities/preserveException.hpp" | |
80 #ifdef TARGET_OS_FAMILY_linux | |
81 # include "os_linux.inline.hpp" | |
82 # include "thread_linux.inline.hpp" | |
83 #endif | |
84 #ifdef TARGET_OS_FAMILY_solaris | |
85 # include "os_solaris.inline.hpp" | |
86 # include "thread_solaris.inline.hpp" | |
87 #endif | |
88 #ifdef TARGET_OS_FAMILY_windows | |
89 # include "os_windows.inline.hpp" | |
90 # include "thread_windows.inline.hpp" | |
91 #endif | |
3960 | 92 #ifdef TARGET_OS_FAMILY_bsd |
93 # include "os_bsd.inline.hpp" | |
94 # include "thread_bsd.inline.hpp" | |
95 #endif | |
1972 | 96 #ifndef SERIALGC |
97 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
98 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
99 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
100 #endif | |
101 #ifdef COMPILER1 | |
102 #include "c1/c1_Compiler.hpp" | |
103 #endif | |
104 #ifdef COMPILER2 | |
105 #include "opto/c2compiler.hpp" | |
106 #include "opto/idealGraphPrinter.hpp" | |
107 #endif | |
0 | 108 |
109 #ifdef DTRACE_ENABLED | |
110 | |
111 // Only bother with this argument setup if dtrace is available | |
112 | |
4006 | 113 #ifndef USDT2 |
0 | 114 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); |
115 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
116 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
117 intptr_t, intptr_t, bool); | |
118 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
119 intptr_t, intptr_t, bool); | |
120 | |
121 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
122 { \ | |
123 ResourceMark rm(this); \ | |
124 int len = 0; \ | |
125 const char* name = (javathread)->get_thread_name(); \ | |
126 len = strlen(name); \ | |
127 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
128 name, len, \ | |
129 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
130 (javathread)->osthread()->thread_id(), \ | |
131 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
132 } | |
133 | |
4006 | 134 #else /* USDT2 */ |
135 | |
136 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_PROBE_START | |
137 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_PROBE_STOP | |
138 | |
139 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
140 { \ | |
141 ResourceMark rm(this); \ | |
142 int len = 0; \ | |
143 const char* name = (javathread)->get_thread_name(); \ | |
144 len = strlen(name); \ | |
145 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \ | |
146 (char *) name, len, \ | |
147 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
148 (uintptr_t) (javathread)->osthread()->thread_id(), \ | |
149 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
150 } | |
151 | |
152 #endif /* USDT2 */ | |
153 | |
0 | 154 #else // ndef DTRACE_ENABLED |
155 | |
156 #define DTRACE_THREAD_PROBE(probe, javathread) | |
157 | |
158 #endif // ndef DTRACE_ENABLED | |
159 | |
160 // Class hierarchy | |
161 // - Thread | |
162 // - VMThread | |
163 // - WatcherThread | |
164 // - ConcurrentMarkSweepThread | |
165 // - JavaThread | |
166 // - CompilerThread | |
167 | |
168 // ======= Thread ======== | |
169 | |
170 // Support for forcing alignment of thread objects for biased locking | |
171 void* Thread::operator new(size_t size) { | |
172 if (UseBiasedLocking) { | |
173 const int alignment = markOopDesc::biased_lock_alignment; | |
174 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
175 void* real_malloc_addr = CHeapObj::operator new(aligned_size); | |
176 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); | |
177 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
178 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
179 "JavaThread alignment code overflowed allocated storage"); | |
180 if (TraceBiasedLocking) { | |
181 if (aligned_addr != real_malloc_addr) | |
182 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
183 real_malloc_addr, aligned_addr); | |
184 } | |
185 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
186 return aligned_addr; | |
187 } else { | |
188 return CHeapObj::operator new(size); | |
189 } | |
190 } | |
191 | |
192 void Thread::operator delete(void* p) { | |
193 if (UseBiasedLocking) { | |
194 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
195 CHeapObj::operator delete(real_malloc_addr); | |
196 } else { | |
197 CHeapObj::operator delete(p); | |
198 } | |
199 } | |
200 | |
201 | |
202 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
203 // JavaThread | |
204 | |
205 | |
206 Thread::Thread() { | |
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207 // stack and get_thread |
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208 set_stack_base(NULL); |
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209 set_stack_size(0); |
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210 set_self_raw_id(0); |
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211 set_lgrp_id(-1); |
0 | 212 |
213 // allocated data structures | |
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214 set_osthread(NULL); |
0 | 215 set_resource_area(new ResourceArea()); |
216 set_handle_area(new HandleArea(NULL)); | |
217 set_active_handles(NULL); | |
218 set_free_handle_block(NULL); | |
219 set_last_handle_mark(NULL); | |
220 | |
221 // This initial value ==> never claimed. | |
222 _oops_do_parity = 0; | |
223 | |
224 // the handle mark links itself to last_handle_mark | |
225 new HandleMark(this); | |
226 | |
227 // plain initialization | |
228 debug_only(_owned_locks = NULL;) | |
229 debug_only(_allow_allocation_count = 0;) | |
230 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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231 NOT_PRODUCT(_skip_gcalot = false;) |
0 | 232 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
233 _jvmti_env_iteration_count = 0; | |
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234 set_allocated_bytes(0); |
0 | 235 _vm_operation_started_count = 0; |
236 _vm_operation_completed_count = 0; | |
237 _current_pending_monitor = NULL; | |
238 _current_pending_monitor_is_from_java = true; | |
239 _current_waiting_monitor = NULL; | |
240 _num_nested_signal = 0; | |
241 omFreeList = NULL ; | |
242 omFreeCount = 0 ; | |
243 omFreeProvision = 32 ; | |
1587 | 244 omInUseList = NULL ; |
245 omInUseCount = 0 ; | |
0 | 246 |
247 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); | |
248 _suspend_flags = 0; | |
249 | |
250 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
251 _hashStateX = os::random() ; | |
252 _hashStateY = 842502087 ; | |
253 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
254 _hashStateW = 273326509 ; | |
255 | |
256 _OnTrap = 0 ; | |
257 _schedctl = NULL ; | |
258 _Stalled = 0 ; | |
259 _TypeTag = 0x2BAD ; | |
260 | |
261 // Many of the following fields are effectively final - immutable | |
262 // Note that nascent threads can't use the Native Monitor-Mutex | |
263 // construct until the _MutexEvent is initialized ... | |
264 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
265 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
266 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
267 // and ::Release() | |
268 _ParkEvent = ParkEvent::Allocate (this) ; | |
269 _SleepEvent = ParkEvent::Allocate (this) ; | |
270 _MutexEvent = ParkEvent::Allocate (this) ; | |
271 _MuxEvent = ParkEvent::Allocate (this) ; | |
272 | |
273 #ifdef CHECK_UNHANDLED_OOPS | |
274 if (CheckUnhandledOops) { | |
275 _unhandled_oops = new UnhandledOops(this); | |
276 } | |
277 #endif // CHECK_UNHANDLED_OOPS | |
278 #ifdef ASSERT | |
279 if (UseBiasedLocking) { | |
280 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
281 assert(this == _real_malloc_address || | |
282 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
283 "bug in forced alignment of thread objects"); | |
284 } | |
285 #endif /* ASSERT */ | |
286 } | |
287 | |
288 void Thread::initialize_thread_local_storage() { | |
289 // Note: Make sure this method only calls | |
290 // non-blocking operations. Otherwise, it might not work | |
291 // with the thread-startup/safepoint interaction. | |
292 | |
293 // During Java thread startup, safepoint code should allow this | |
294 // method to complete because it may need to allocate memory to | |
295 // store information for the new thread. | |
296 | |
297 // initialize structure dependent on thread local storage | |
298 ThreadLocalStorage::set_thread(this); | |
299 | |
300 // set up any platform-specific state. | |
301 os::initialize_thread(); | |
302 | |
303 } | |
304 | |
305 void Thread::record_stack_base_and_size() { | |
306 set_stack_base(os::current_stack_base()); | |
307 set_stack_size(os::current_stack_size()); | |
308 } | |
309 | |
310 | |
311 Thread::~Thread() { | |
312 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
313 ObjectSynchronizer::omFlush (this) ; | |
314 | |
315 // deallocate data structures | |
316 delete resource_area(); | |
317 // since the handle marks are using the handle area, we have to deallocated the root | |
318 // handle mark before deallocating the thread's handle area, | |
319 assert(last_handle_mark() != NULL, "check we have an element"); | |
320 delete last_handle_mark(); | |
321 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
322 | |
323 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
324 // We NULL out the fields for good hygiene. | |
325 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
326 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
327 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
328 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
329 | |
330 delete handle_area(); | |
331 | |
332 // osthread() can be NULL, if creation of thread failed. | |
333 if (osthread() != NULL) os::free_thread(osthread()); | |
334 | |
335 delete _SR_lock; | |
336 | |
337 // clear thread local storage if the Thread is deleting itself | |
338 if (this == Thread::current()) { | |
339 ThreadLocalStorage::set_thread(NULL); | |
340 } else { | |
341 // In the case where we're not the current thread, invalidate all the | |
342 // caches in case some code tries to get the current thread or the | |
343 // thread that was destroyed, and gets stale information. | |
344 ThreadLocalStorage::invalidate_all(); | |
345 } | |
346 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
347 } | |
348 | |
349 // NOTE: dummy function for assertion purpose. | |
350 void Thread::run() { | |
351 ShouldNotReachHere(); | |
352 } | |
353 | |
354 #ifdef ASSERT | |
355 // Private method to check for dangling thread pointer | |
356 void check_for_dangling_thread_pointer(Thread *thread) { | |
357 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
358 "possibility of dangling Thread pointer"); | |
359 } | |
360 #endif | |
361 | |
362 | |
363 #ifndef PRODUCT | |
364 // Tracing method for basic thread operations | |
365 void Thread::trace(const char* msg, const Thread* const thread) { | |
366 if (!TraceThreadEvents) return; | |
367 ResourceMark rm; | |
368 ThreadCritical tc; | |
369 const char *name = "non-Java thread"; | |
370 int prio = -1; | |
371 if (thread->is_Java_thread() | |
372 && !thread->is_Compiler_thread()) { | |
373 // The Threads_lock must be held to get information about | |
374 // this thread but may not be in some situations when | |
375 // tracing thread events. | |
376 bool release_Threads_lock = false; | |
377 if (!Threads_lock->owned_by_self()) { | |
378 Threads_lock->lock(); | |
379 release_Threads_lock = true; | |
380 } | |
381 JavaThread* jt = (JavaThread *)thread; | |
382 name = (char *)jt->get_thread_name(); | |
383 oop thread_oop = jt->threadObj(); | |
384 if (thread_oop != NULL) { | |
385 prio = java_lang_Thread::priority(thread_oop); | |
386 } | |
387 if (release_Threads_lock) { | |
388 Threads_lock->unlock(); | |
389 } | |
390 } | |
391 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
392 } | |
393 #endif | |
394 | |
395 | |
396 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
397 trace("get priority", thread); | |
398 ThreadPriority priority; | |
399 // Can return an error! | |
400 (void)os::get_priority(thread, priority); | |
401 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
402 return priority; | |
403 } | |
404 | |
405 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
406 trace("set priority", thread); | |
407 debug_only(check_for_dangling_thread_pointer(thread);) | |
408 // Can return an error! | |
409 (void)os::set_priority(thread, priority); | |
410 } | |
411 | |
412 | |
413 void Thread::start(Thread* thread) { | |
414 trace("start", thread); | |
415 // Start is different from resume in that its safety is guaranteed by context or | |
416 // being called from a Java method synchronized on the Thread object. | |
417 if (!DisableStartThread) { | |
418 if (thread->is_Java_thread()) { | |
419 // Initialize the thread state to RUNNABLE before starting this thread. | |
420 // Can not set it after the thread started because we do not know the | |
421 // exact thread state at that time. It could be in MONITOR_WAIT or | |
422 // in SLEEPING or some other state. | |
423 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
424 java_lang_Thread::RUNNABLE); | |
425 } | |
426 os::start_thread(thread); | |
427 } | |
428 } | |
429 | |
430 // Enqueue a VM_Operation to do the job for us - sometime later | |
431 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
432 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
433 VMThread::execute(vm_stop); | |
434 } | |
435 | |
436 | |
437 // | |
438 // Check if an external suspend request has completed (or has been | |
439 // cancelled). Returns true if the thread is externally suspended and | |
440 // false otherwise. | |
441 // | |
442 // The bits parameter returns information about the code path through | |
443 // the routine. Useful for debugging: | |
444 // | |
445 // set in is_ext_suspend_completed(): | |
446 // 0x00000001 - routine was entered | |
447 // 0x00000010 - routine return false at end | |
448 // 0x00000100 - thread exited (return false) | |
449 // 0x00000200 - suspend request cancelled (return false) | |
450 // 0x00000400 - thread suspended (return true) | |
451 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
452 // 0x00002000 - thread is native and walkable (return true) | |
453 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
454 // | |
455 // set in wait_for_ext_suspend_completion(): | |
456 // 0x00010000 - routine was entered | |
457 // 0x00020000 - suspend request cancelled before loop (return false) | |
458 // 0x00040000 - thread suspended before loop (return true) | |
459 // 0x00080000 - suspend request cancelled in loop (return false) | |
460 // 0x00100000 - thread suspended in loop (return true) | |
461 // 0x00200000 - suspend not completed during retry loop (return false) | |
462 // | |
463 | |
464 // Helper class for tracing suspend wait debug bits. | |
465 // | |
466 // 0x00000100 indicates that the target thread exited before it could | |
467 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
468 // 0x00080000 each indicate a cancelled suspend request so they don't | |
469 // count as wait failures either. | |
470 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
471 | |
472 class TraceSuspendDebugBits : public StackObj { | |
473 private: | |
474 JavaThread * jt; | |
475 bool is_wait; | |
476 bool called_by_wait; // meaningful when !is_wait | |
477 uint32_t * bits; | |
478 | |
479 public: | |
480 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
481 uint32_t *_bits) { | |
482 jt = _jt; | |
483 is_wait = _is_wait; | |
484 called_by_wait = _called_by_wait; | |
485 bits = _bits; | |
486 } | |
487 | |
488 ~TraceSuspendDebugBits() { | |
489 if (!is_wait) { | |
490 #if 1 | |
491 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
492 // That trace is very chatty. | |
493 return; | |
494 #else | |
495 if (!called_by_wait) { | |
496 // If tracing for is_ext_suspend_completed() is enabled, then only | |
497 // trace calls to it from wait_for_ext_suspend_completion() | |
498 return; | |
499 } | |
500 #endif | |
501 } | |
502 | |
503 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
504 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
505 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
506 ResourceMark rm; | |
507 | |
508 tty->print_cr( | |
509 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
510 jt->get_thread_name(), *bits); | |
511 | |
512 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
513 } | |
514 } | |
515 } | |
516 }; | |
517 #undef DEBUG_FALSE_BITS | |
518 | |
519 | |
520 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
521 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
522 | |
523 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
524 bool do_trans_retry; // flag to force the retry | |
525 | |
526 *bits |= 0x00000001; | |
527 | |
528 do { | |
529 do_trans_retry = false; | |
530 | |
531 if (is_exiting()) { | |
532 // Thread is in the process of exiting. This is always checked | |
533 // first to reduce the risk of dereferencing a freed JavaThread. | |
534 *bits |= 0x00000100; | |
535 return false; | |
536 } | |
537 | |
538 if (!is_external_suspend()) { | |
539 // Suspend request is cancelled. This is always checked before | |
540 // is_ext_suspended() to reduce the risk of a rogue resume | |
541 // confusing the thread that made the suspend request. | |
542 *bits |= 0x00000200; | |
543 return false; | |
544 } | |
545 | |
546 if (is_ext_suspended()) { | |
547 // thread is suspended | |
548 *bits |= 0x00000400; | |
549 return true; | |
550 } | |
551 | |
552 // Now that we no longer do hard suspends of threads running | |
553 // native code, the target thread can be changing thread state | |
554 // while we are in this routine: | |
555 // | |
556 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
557 // | |
558 // We save a copy of the thread state as observed at this moment | |
559 // and make our decision about suspend completeness based on the | |
560 // copy. This closes the race where the thread state is seen as | |
561 // _thread_in_native_trans in the if-thread_blocked check, but is | |
562 // seen as _thread_blocked in if-thread_in_native_trans check. | |
563 JavaThreadState save_state = thread_state(); | |
564 | |
565 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
566 // If the thread's state is _thread_blocked and this blocking | |
567 // condition is known to be equivalent to a suspend, then we can | |
568 // consider the thread to be externally suspended. This means that | |
569 // the code that sets _thread_blocked has been modified to do | |
570 // self-suspension if the blocking condition releases. We also | |
571 // used to check for CONDVAR_WAIT here, but that is now covered by | |
572 // the _thread_blocked with self-suspension check. | |
573 // | |
574 // Return true since we wouldn't be here unless there was still an | |
575 // external suspend request. | |
576 *bits |= 0x00001000; | |
577 return true; | |
578 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
579 // Threads running native code will self-suspend on native==>VM/Java | |
580 // transitions. If its stack is walkable (should always be the case | |
581 // unless this function is called before the actual java_suspend() | |
582 // call), then the wait is done. | |
583 *bits |= 0x00002000; | |
584 return true; | |
585 } else if (!called_by_wait && !did_trans_retry && | |
586 save_state == _thread_in_native_trans && | |
587 frame_anchor()->walkable()) { | |
588 // The thread is transitioning from thread_in_native to another | |
589 // thread state. check_safepoint_and_suspend_for_native_trans() | |
590 // will force the thread to self-suspend. If it hasn't gotten | |
591 // there yet we may have caught the thread in-between the native | |
592 // code check above and the self-suspend. Lucky us. If we were | |
593 // called by wait_for_ext_suspend_completion(), then it | |
594 // will be doing the retries so we don't have to. | |
595 // | |
596 // Since we use the saved thread state in the if-statement above, | |
597 // there is a chance that the thread has already transitioned to | |
598 // _thread_blocked by the time we get here. In that case, we will | |
599 // make a single unnecessary pass through the logic below. This | |
600 // doesn't hurt anything since we still do the trans retry. | |
601 | |
602 *bits |= 0x00004000; | |
603 | |
604 // Once the thread leaves thread_in_native_trans for another | |
605 // thread state, we break out of this retry loop. We shouldn't | |
606 // need this flag to prevent us from getting back here, but | |
607 // sometimes paranoia is good. | |
608 did_trans_retry = true; | |
609 | |
610 // We wait for the thread to transition to a more usable state. | |
611 for (int i = 1; i <= SuspendRetryCount; i++) { | |
612 // We used to do an "os::yield_all(i)" call here with the intention | |
613 // that yielding would increase on each retry. However, the parameter | |
614 // is ignored on Linux which means the yield didn't scale up. Waiting | |
615 // on the SR_lock below provides a much more predictable scale up for | |
616 // the delay. It also provides a simple/direct point to check for any | |
617 // safepoint requests from the VMThread | |
618 | |
619 // temporarily drops SR_lock while doing wait with safepoint check | |
620 // (if we're a JavaThread - the WatcherThread can also call this) | |
621 // and increase delay with each retry | |
622 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
623 | |
624 // check the actual thread state instead of what we saved above | |
625 if (thread_state() != _thread_in_native_trans) { | |
626 // the thread has transitioned to another thread state so | |
627 // try all the checks (except this one) one more time. | |
628 do_trans_retry = true; | |
629 break; | |
630 } | |
631 } // end retry loop | |
632 | |
633 | |
634 } | |
635 } while (do_trans_retry); | |
636 | |
637 *bits |= 0x00000010; | |
638 return false; | |
639 } | |
640 | |
641 // | |
642 // Wait for an external suspend request to complete (or be cancelled). | |
643 // Returns true if the thread is externally suspended and false otherwise. | |
644 // | |
645 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
646 uint32_t *bits) { | |
647 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
648 false /* !called_by_wait */, bits); | |
649 | |
650 // local flag copies to minimize SR_lock hold time | |
651 bool is_suspended; | |
652 bool pending; | |
653 uint32_t reset_bits; | |
654 | |
655 // set a marker so is_ext_suspend_completed() knows we are the caller | |
656 *bits |= 0x00010000; | |
657 | |
658 // We use reset_bits to reinitialize the bits value at the top of | |
659 // each retry loop. This allows the caller to make use of any | |
660 // unused bits for their own marking purposes. | |
661 reset_bits = *bits; | |
662 | |
663 { | |
664 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
665 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
666 delay, bits); | |
667 pending = is_external_suspend(); | |
668 } | |
669 // must release SR_lock to allow suspension to complete | |
670 | |
671 if (!pending) { | |
672 // A cancelled suspend request is the only false return from | |
673 // is_ext_suspend_completed() that keeps us from entering the | |
674 // retry loop. | |
675 *bits |= 0x00020000; | |
676 return false; | |
677 } | |
678 | |
679 if (is_suspended) { | |
680 *bits |= 0x00040000; | |
681 return true; | |
682 } | |
683 | |
684 for (int i = 1; i <= retries; i++) { | |
685 *bits = reset_bits; // reinit to only track last retry | |
686 | |
687 // We used to do an "os::yield_all(i)" call here with the intention | |
688 // that yielding would increase on each retry. However, the parameter | |
689 // is ignored on Linux which means the yield didn't scale up. Waiting | |
690 // on the SR_lock below provides a much more predictable scale up for | |
691 // the delay. It also provides a simple/direct point to check for any | |
692 // safepoint requests from the VMThread | |
693 | |
694 { | |
695 MutexLocker ml(SR_lock()); | |
696 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
697 // can also call this) and increase delay with each retry | |
698 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
699 | |
700 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
701 delay, bits); | |
702 | |
703 // It is possible for the external suspend request to be cancelled | |
704 // (by a resume) before the actual suspend operation is completed. | |
705 // Refresh our local copy to see if we still need to wait. | |
706 pending = is_external_suspend(); | |
707 } | |
708 | |
709 if (!pending) { | |
710 // A cancelled suspend request is the only false return from | |
711 // is_ext_suspend_completed() that keeps us from staying in the | |
712 // retry loop. | |
713 *bits |= 0x00080000; | |
714 return false; | |
715 } | |
716 | |
717 if (is_suspended) { | |
718 *bits |= 0x00100000; | |
719 return true; | |
720 } | |
721 } // end retry loop | |
722 | |
723 // thread did not suspend after all our retries | |
724 *bits |= 0x00200000; | |
725 return false; | |
726 } | |
727 | |
728 #ifndef PRODUCT | |
729 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
730 | |
731 // This should not need to be atomic as the only way for simultaneous | |
732 // updates is via interrupts. Even then this should be rare or non-existant | |
733 // and we don't care that much anyway. | |
734 | |
735 int index = _jmp_ring_index; | |
736 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
737 _jmp_ring[index]._target = (intptr_t) target; | |
738 _jmp_ring[index]._instruction = (intptr_t) instr; | |
739 _jmp_ring[index]._file = file; | |
740 _jmp_ring[index]._line = line; | |
741 } | |
742 #endif /* PRODUCT */ | |
743 | |
744 // Called by flat profiler | |
745 // Callers have already called wait_for_ext_suspend_completion | |
746 // The assertion for that is currently too complex to put here: | |
747 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
748 bool gotframe = false; | |
749 // self suspension saves needed state. | |
750 if (has_last_Java_frame() && _anchor.walkable()) { | |
751 *_fr = pd_last_frame(); | |
752 gotframe = true; | |
753 } | |
754 return gotframe; | |
755 } | |
756 | |
757 void Thread::interrupt(Thread* thread) { | |
758 trace("interrupt", thread); | |
759 debug_only(check_for_dangling_thread_pointer(thread);) | |
760 os::interrupt(thread); | |
761 } | |
762 | |
763 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
764 trace("is_interrupted", thread); | |
765 debug_only(check_for_dangling_thread_pointer(thread);) | |
766 // Note: If clear_interrupted==false, this simply fetches and | |
767 // returns the value of the field osthread()->interrupted(). | |
768 return os::is_interrupted(thread, clear_interrupted); | |
769 } | |
770 | |
771 | |
772 // GC Support | |
773 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
774 jint thread_parity = _oops_do_parity; | |
775 if (thread_parity != strong_roots_parity) { | |
776 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
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777 if (res == thread_parity) { |
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778 return true; |
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779 } else { |
0 | 780 guarantee(res == strong_roots_parity, "Or else what?"); |
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781 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
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782 "Should only fail when parallel."); |
0 | 783 return false; |
784 } | |
785 } | |
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786 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
0 | 787 "Should only fail when parallel."); |
788 return false; | |
789 } | |
790 | |
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791 void Thread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 792 active_handles()->oops_do(f); |
793 // Do oop for ThreadShadow | |
794 f->do_oop((oop*)&_pending_exception); | |
795 handle_area()->oops_do(f); | |
796 } | |
797 | |
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798 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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799 // no nmethods in a generic thread... |
0 | 800 } |
801 | |
802 void Thread::print_on(outputStream* st) const { | |
803 // get_priority assumes osthread initialized | |
804 if (osthread() != NULL) { | |
805 st->print("prio=%d tid=" INTPTR_FORMAT " ", get_priority(this), this); | |
806 osthread()->print_on(st); | |
807 } | |
808 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
809 } | |
810 | |
811 // Thread::print_on_error() is called by fatal error handler. Don't use | |
812 // any lock or allocate memory. | |
813 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
814 if (is_VM_thread()) st->print("VMThread"); | |
815 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
816 else if (is_Java_thread()) st->print("JavaThread"); | |
817 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
818 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
819 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
820 else st->print("Thread"); | |
821 | |
822 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
823 _stack_base - _stack_size, _stack_base); | |
824 | |
825 if (osthread()) { | |
826 st->print(" [id=%d]", osthread()->thread_id()); | |
827 } | |
828 } | |
829 | |
830 #ifdef ASSERT | |
831 void Thread::print_owned_locks_on(outputStream* st) const { | |
832 Monitor *cur = _owned_locks; | |
833 if (cur == NULL) { | |
834 st->print(" (no locks) "); | |
835 } else { | |
836 st->print_cr(" Locks owned:"); | |
837 while(cur) { | |
838 cur->print_on(st); | |
839 cur = cur->next(); | |
840 } | |
841 } | |
842 } | |
843 | |
844 static int ref_use_count = 0; | |
845 | |
846 bool Thread::owns_locks_but_compiled_lock() const { | |
847 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
848 if (cur != Compile_lock) return true; | |
849 } | |
850 return false; | |
851 } | |
852 | |
853 | |
854 #endif | |
855 | |
856 #ifndef PRODUCT | |
857 | |
858 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
859 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
860 // no threads which allow_vm_block's are held | |
861 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
862 // Check if current thread is allowed to block at a safepoint | |
863 if (!(_allow_safepoint_count == 0)) | |
864 fatal("Possible safepoint reached by thread that does not allow it"); | |
865 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
866 fatal("LEAF method calling lock?"); | |
867 } | |
868 | |
869 #ifdef ASSERT | |
870 if (potential_vm_operation && is_Java_thread() | |
871 && !Universe::is_bootstrapping()) { | |
872 // Make sure we do not hold any locks that the VM thread also uses. | |
873 // This could potentially lead to deadlocks | |
874 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
875 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
876 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
877 // since it is used to transfer control between JavaThreads and the VMThread | |
878 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
879 if ( (cur->allow_vm_block() && | |
880 cur != Threads_lock && | |
881 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
882 cur != VMOperationRequest_lock && | |
883 cur != VMOperationQueue_lock) || | |
884 cur->rank() == Mutex::special) { | |
885 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
886 } | |
887 } | |
888 } | |
889 | |
890 if (GCALotAtAllSafepoints) { | |
891 // We could enter a safepoint here and thus have a gc | |
892 InterfaceSupport::check_gc_alot(); | |
893 } | |
894 #endif | |
895 } | |
896 #endif | |
897 | |
898 bool Thread::is_in_stack(address adr) const { | |
899 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
900 address end = os::current_stack_pointer(); | |
901 if (stack_base() >= adr && adr >= end) return true; | |
902 | |
903 return false; | |
904 } | |
905 | |
906 | |
907 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
908 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
909 // used for compilation in the future. If that change is made, the need for these methods | |
910 // should be revisited, and they should be removed if possible. | |
911 | |
912 bool Thread::is_lock_owned(address adr) const { | |
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913 return on_local_stack(adr); |
0 | 914 } |
915 | |
916 bool Thread::set_as_starting_thread() { | |
917 // NOTE: this must be called inside the main thread. | |
918 return os::create_main_thread((JavaThread*)this); | |
919 } | |
920 | |
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921 static void initialize_class(Symbol* class_name, TRAPS) { |
0 | 922 klassOop klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
923 instanceKlass::cast(klass)->initialize(CHECK); | |
924 } | |
925 | |
926 | |
927 // Creates the initial ThreadGroup | |
928 static Handle create_initial_thread_group(TRAPS) { | |
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929 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
0 | 930 instanceKlassHandle klass (THREAD, k); |
931 | |
932 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
933 { | |
934 JavaValue result(T_VOID); | |
935 JavaCalls::call_special(&result, | |
936 system_instance, | |
937 klass, | |
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938 vmSymbols::object_initializer_name(), |
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939 vmSymbols::void_method_signature(), |
0 | 940 CHECK_NH); |
941 } | |
942 Universe::set_system_thread_group(system_instance()); | |
943 | |
944 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
945 { | |
946 JavaValue result(T_VOID); | |
947 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
948 JavaCalls::call_special(&result, | |
949 main_instance, | |
950 klass, | |
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951 vmSymbols::object_initializer_name(), |
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952 vmSymbols::threadgroup_string_void_signature(), |
0 | 953 system_instance, |
954 string, | |
955 CHECK_NH); | |
956 } | |
957 return main_instance; | |
958 } | |
959 | |
960 // Creates the initial Thread | |
961 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
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962 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
0 | 963 instanceKlassHandle klass (THREAD, k); |
964 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
965 | |
966 java_lang_Thread::set_thread(thread_oop(), thread); | |
967 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
968 thread->set_threadObj(thread_oop()); | |
969 | |
970 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
971 | |
972 JavaValue result(T_VOID); | |
973 JavaCalls::call_special(&result, thread_oop, | |
974 klass, | |
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975 vmSymbols::object_initializer_name(), |
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976 vmSymbols::threadgroup_string_void_signature(), |
0 | 977 thread_group, |
978 string, | |
979 CHECK_NULL); | |
980 return thread_oop(); | |
981 } | |
982 | |
983 static void call_initializeSystemClass(TRAPS) { | |
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984 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 985 instanceKlassHandle klass (THREAD, k); |
986 | |
987 JavaValue result(T_VOID); | |
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988 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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989 vmSymbols::void_method_signature(), CHECK); |
0 | 990 } |
991 | |
2129
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992 // General purpose hook into Java code, run once when the VM is initialized. |
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993 // The Java library method itself may be changed independently from the VM. |
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994 static void call_postVMInitHook(TRAPS) { |
3938 | 995 klassOop k = SystemDictionary::PostVMInitHook_klass(); |
2129
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996 instanceKlassHandle klass (THREAD, k); |
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997 if (klass.not_null()) { |
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998 JavaValue result(T_VOID); |
2177
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999 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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1000 vmSymbols::void_method_signature(), |
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1001 CHECK); |
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1002 } |
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1003 } |
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1004 |
0 | 1005 static void reset_vm_info_property(TRAPS) { |
1006 // the vm info string | |
1007 ResourceMark rm(THREAD); | |
1008 const char *vm_info = VM_Version::vm_info_string(); | |
1009 | |
1010 // java.lang.System class | |
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1011 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 1012 instanceKlassHandle klass (THREAD, k); |
1013 | |
1014 // setProperty arguments | |
1015 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
1016 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
1017 | |
1018 // return value | |
1019 JavaValue r(T_OBJECT); | |
1020 | |
1021 // public static String setProperty(String key, String value); | |
1022 JavaCalls::call_static(&r, | |
1023 klass, | |
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1024 vmSymbols::setProperty_name(), |
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1025 vmSymbols::string_string_string_signature(), |
0 | 1026 key_str, |
1027 value_str, | |
1028 CHECK); | |
1029 } | |
1030 | |
1031 | |
1032 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
1033 assert(thread_group.not_null(), "thread group should be specified"); | |
1034 assert(threadObj() == NULL, "should only create Java thread object once"); | |
1035 | |
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1036 klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
0 | 1037 instanceKlassHandle klass (THREAD, k); |
1038 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
1039 | |
1040 java_lang_Thread::set_thread(thread_oop(), this); | |
1041 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1042 set_threadObj(thread_oop()); | |
1043 | |
1044 JavaValue result(T_VOID); | |
1045 if (thread_name != NULL) { | |
1046 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
1047 // Thread gets assigned specified name and null target | |
1048 JavaCalls::call_special(&result, | |
1049 thread_oop, | |
1050 klass, | |
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1051 vmSymbols::object_initializer_name(), |
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1052 vmSymbols::threadgroup_string_void_signature(), |
0 | 1053 thread_group, // Argument 1 |
1054 name, // Argument 2 | |
1055 THREAD); | |
1056 } else { | |
1057 // Thread gets assigned name "Thread-nnn" and null target | |
1058 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
1059 JavaCalls::call_special(&result, | |
1060 thread_oop, | |
1061 klass, | |
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1062 vmSymbols::object_initializer_name(), |
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1063 vmSymbols::threadgroup_runnable_void_signature(), |
0 | 1064 thread_group, // Argument 1 |
1065 Handle(), // Argument 2 | |
1066 THREAD); | |
1067 } | |
1068 | |
1069 | |
1070 if (daemon) { | |
1071 java_lang_Thread::set_daemon(thread_oop()); | |
1072 } | |
1073 | |
1074 if (HAS_PENDING_EXCEPTION) { | |
1075 return; | |
1076 } | |
1077 | |
1142 | 1078 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
0 | 1079 Handle threadObj(this, this->threadObj()); |
1080 | |
1081 JavaCalls::call_special(&result, | |
1082 thread_group, | |
1083 group, | |
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1084 vmSymbols::add_method_name(), |
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1085 vmSymbols::thread_void_signature(), |
0 | 1086 threadObj, // Arg 1 |
1087 THREAD); | |
1088 | |
1089 | |
1090 } | |
1091 | |
1092 // NamedThread -- non-JavaThread subclasses with multiple | |
1093 // uniquely named instances should derive from this. | |
1094 NamedThread::NamedThread() : Thread() { | |
1095 _name = NULL; | |
1119
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1096 _processed_thread = NULL; |
0 | 1097 } |
1098 | |
1099 NamedThread::~NamedThread() { | |
1100 if (_name != NULL) { | |
1101 FREE_C_HEAP_ARRAY(char, _name); | |
1102 _name = NULL; | |
1103 } | |
1104 } | |
1105 | |
1106 void NamedThread::set_name(const char* format, ...) { | |
1107 guarantee(_name == NULL, "Only get to set name once."); | |
1108 _name = NEW_C_HEAP_ARRAY(char, max_name_len); | |
1109 guarantee(_name != NULL, "alloc failure"); | |
1110 va_list ap; | |
1111 va_start(ap, format); | |
1112 jio_vsnprintf(_name, max_name_len, format, ap); | |
1113 va_end(ap); | |
1114 } | |
1115 | |
1116 // ======= WatcherThread ======== | |
1117 | |
1118 // The watcher thread exists to simulate timer interrupts. It should | |
1119 // be replaced by an abstraction over whatever native support for | |
1120 // timer interrupts exists on the platform. | |
1121 | |
1122 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
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1123 volatile bool WatcherThread::_should_terminate = false; |
0 | 1124 |
1125 WatcherThread::WatcherThread() : Thread() { | |
1126 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
1127 if (os::create_thread(this, os::watcher_thread)) { | |
1128 _watcher_thread = this; | |
1129 | |
1130 // Set the watcher thread to the highest OS priority which should not be | |
1131 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
1132 // is created. The only normal thread using this priority is the reference | |
1133 // handler thread, which runs for very short intervals only. | |
1134 // If the VMThread's priority is not lower than the WatcherThread profiling | |
1135 // will be inaccurate. | |
1136 os::set_priority(this, MaxPriority); | |
1137 if (!DisableStartThread) { | |
1138 os::start_thread(this); | |
1139 } | |
1140 } | |
1141 } | |
1142 | |
1143 void WatcherThread::run() { | |
1144 assert(this == watcher_thread(), "just checking"); | |
1145 | |
1146 this->record_stack_base_and_size(); | |
1147 this->initialize_thread_local_storage(); | |
1148 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1149 while(!_should_terminate) { | |
1150 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
1151 assert(watcher_thread() == this, "thread consistency check"); | |
1152 | |
1153 // Calculate how long it'll be until the next PeriodicTask work | |
1154 // should be done, and sleep that amount of time. | |
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1155 size_t time_to_wait = PeriodicTask::time_to_wait(); |
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1156 |
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1157 // we expect this to timeout - we only ever get unparked when |
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1158 // we should terminate |
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1159 { |
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1160 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1161 |
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1162 jlong prev_time = os::javaTimeNanos(); |
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1163 for (;;) { |
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1164 int res= _SleepEvent->park(time_to_wait); |
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1165 if (res == OS_TIMEOUT || _should_terminate) |
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1166 break; |
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1167 // spurious wakeup of some kind |
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1168 jlong now = os::javaTimeNanos(); |
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1169 time_to_wait -= (now - prev_time) / 1000000; |
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1170 if (time_to_wait <= 0) |
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1171 break; |
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1172 prev_time = now; |
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1173 } |
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1174 } |
0 | 1175 |
1176 if (is_error_reported()) { | |
1177 // A fatal error has happened, the error handler(VMError::report_and_die) | |
1178 // should abort JVM after creating an error log file. However in some | |
1179 // rare cases, the error handler itself might deadlock. Here we try to | |
1180 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
1181 // | |
1182 // This code is in WatcherThread because WatcherThread wakes up | |
1183 // periodically so the fatal error handler doesn't need to do anything; | |
1184 // also because the WatcherThread is less likely to crash than other | |
1185 // threads. | |
1186 | |
1187 for (;;) { | |
1188 if (!ShowMessageBoxOnError | |
1189 && (OnError == NULL || OnError[0] == '\0') | |
1190 && Arguments::abort_hook() == NULL) { | |
1191 os::sleep(this, 2 * 60 * 1000, false); | |
1192 fdStream err(defaultStream::output_fd()); | |
1193 err.print_raw_cr("# [ timer expired, abort... ]"); | |
1194 // skip atexit/vm_exit/vm_abort hooks | |
1195 os::die(); | |
1196 } | |
1197 | |
1198 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
1199 // ShowMessageBoxOnError when it is ready to abort. | |
1200 os::sleep(this, 5 * 1000, false); | |
1201 } | |
1202 } | |
1203 | |
1204 PeriodicTask::real_time_tick(time_to_wait); | |
1205 | |
1206 // If we have no more tasks left due to dynamic disenrollment, | |
1207 // shut down the thread since we don't currently support dynamic enrollment | |
1208 if (PeriodicTask::num_tasks() == 0) { | |
1209 _should_terminate = true; | |
1210 } | |
1211 } | |
1212 | |
1213 // Signal that it is terminated | |
1214 { | |
1215 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
1216 _watcher_thread = NULL; | |
1217 Terminator_lock->notify(); | |
1218 } | |
1219 | |
1220 // Thread destructor usually does this.. | |
1221 ThreadLocalStorage::set_thread(NULL); | |
1222 } | |
1223 | |
1224 void WatcherThread::start() { | |
1225 if (watcher_thread() == NULL) { | |
1226 _should_terminate = false; | |
1227 // Create the single instance of WatcherThread | |
1228 new WatcherThread(); | |
1229 } | |
1230 } | |
1231 | |
1232 void WatcherThread::stop() { | |
1233 // it is ok to take late safepoints here, if needed | |
1234 MutexLocker mu(Terminator_lock); | |
1235 _should_terminate = true; | |
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1236 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1237 |
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1238 Thread* watcher = watcher_thread(); |
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1239 if (watcher != NULL) |
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1240 watcher->_SleepEvent->unpark(); |
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1241 |
0 | 1242 while(watcher_thread() != NULL) { |
1243 // This wait should make safepoint checks, wait without a timeout, | |
1244 // and wait as a suspend-equivalent condition. | |
1245 // | |
1246 // Note: If the FlatProfiler is running, then this thread is waiting | |
1247 // for the WatcherThread to terminate and the WatcherThread, via the | |
1248 // FlatProfiler task, is waiting for the external suspend request on | |
1249 // this thread to complete. wait_for_ext_suspend_completion() will | |
1250 // eventually timeout, but that takes time. Making this wait a | |
1251 // suspend-equivalent condition solves that timeout problem. | |
1252 // | |
1253 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
1254 Mutex::_as_suspend_equivalent_flag); | |
1255 } | |
1256 } | |
1257 | |
1258 void WatcherThread::print_on(outputStream* st) const { | |
1259 st->print("\"%s\" ", name()); | |
1260 Thread::print_on(st); | |
1261 st->cr(); | |
1262 } | |
1263 | |
1264 // ======= JavaThread ======== | |
1265 | |
1266 // A JavaThread is a normal Java thread | |
1267 | |
1268 void JavaThread::initialize() { | |
1269 // Initialize fields | |
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1270 |
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1271 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1272 set_claimed_par_id(-1); |
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1273 |
0 | 1274 set_saved_exception_pc(NULL); |
1275 set_threadObj(NULL); | |
1276 _anchor.clear(); | |
1277 set_entry_point(NULL); | |
1278 set_jni_functions(jni_functions()); | |
1279 set_callee_target(NULL); | |
1280 set_vm_result(NULL); | |
1281 set_vm_result_2(NULL); | |
1282 set_vframe_array_head(NULL); | |
1283 set_vframe_array_last(NULL); | |
1284 set_deferred_locals(NULL); | |
1285 set_deopt_mark(NULL); | |
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1286 set_deopt_nmethod(NULL); |
0 | 1287 clear_must_deopt_id(); |
1288 set_monitor_chunks(NULL); | |
1289 set_next(NULL); | |
1290 set_thread_state(_thread_new); | |
1291 _terminated = _not_terminated; | |
1292 _privileged_stack_top = NULL; | |
1293 _array_for_gc = NULL; | |
1294 _suspend_equivalent = false; | |
1295 _in_deopt_handler = 0; | |
1296 _doing_unsafe_access = false; | |
1297 _stack_guard_state = stack_guard_unused; | |
1298 _exception_oop = NULL; | |
1299 _exception_pc = 0; | |
1300 _exception_handler_pc = 0; | |
1903 | 1301 _is_method_handle_return = 0; |
0 | 1302 _jvmti_thread_state= NULL; |
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1303 _should_post_on_exceptions_flag = JNI_FALSE; |
0 | 1304 _jvmti_get_loaded_classes_closure = NULL; |
1305 _interp_only_mode = 0; | |
1306 _special_runtime_exit_condition = _no_async_condition; | |
1307 _pending_async_exception = NULL; | |
1308 _is_compiling = false; | |
1309 _thread_stat = NULL; | |
1310 _thread_stat = new ThreadStatistics(); | |
1311 _blocked_on_compilation = false; | |
1312 _jni_active_critical = 0; | |
1313 _do_not_unlock_if_synchronized = false; | |
1314 _cached_monitor_info = NULL; | |
1315 _parker = Parker::Allocate(this) ; | |
1316 | |
1317 #ifndef PRODUCT | |
1318 _jmp_ring_index = 0; | |
1319 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
1320 record_jump(NULL, NULL, NULL, 0); | |
1321 } | |
1322 #endif /* PRODUCT */ | |
1323 | |
1324 set_thread_profiler(NULL); | |
1325 if (FlatProfiler::is_active()) { | |
1326 // This is where we would decide to either give each thread it's own profiler | |
1327 // or use one global one from FlatProfiler, | |
1328 // or up to some count of the number of profiled threads, etc. | |
1329 ThreadProfiler* pp = new ThreadProfiler(); | |
1330 pp->engage(); | |
1331 set_thread_profiler(pp); | |
1332 } | |
1333 | |
1334 // Setup safepoint state info for this thread | |
1335 ThreadSafepointState::create(this); | |
1336 | |
1337 debug_only(_java_call_counter = 0); | |
1338 | |
1339 // JVMTI PopFrame support | |
1340 _popframe_condition = popframe_inactive; | |
1341 _popframe_preserved_args = NULL; | |
1342 _popframe_preserved_args_size = 0; | |
1343 | |
1344 pd_initialize(); | |
1345 } | |
1346 | |
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1347 #ifndef SERIALGC |
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1348 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1349 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1350 #endif // !SERIALGC |
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1351 |
4006 | 1352 JavaThread::JavaThread(bool is_attaching_via_jni) : |
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1353 Thread() |
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1354 #ifndef SERIALGC |
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1355 , _satb_mark_queue(&_satb_mark_queue_set), |
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1356 _dirty_card_queue(&_dirty_card_queue_set) |
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1357 #endif // !SERIALGC |
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1358 { |
0 | 1359 initialize(); |
4006 | 1360 if (is_attaching_via_jni) { |
1361 _jni_attach_state = _attaching_via_jni; | |
1362 } else { | |
1363 _jni_attach_state = _not_attaching_via_jni; | |
1364 } | |
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1365 assert(_deferred_card_mark.is_empty(), "Default MemRegion ctor"); |
0 | 1366 } |
1367 | |
1368 bool JavaThread::reguard_stack(address cur_sp) { | |
1369 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
1370 return true; // Stack already guarded or guard pages not needed. | |
1371 } | |
1372 | |
1373 if (register_stack_overflow()) { | |
1374 // For those architectures which have separate register and | |
1375 // memory stacks, we must check the register stack to see if | |
1376 // it has overflowed. | |
1377 return false; | |
1378 } | |
1379 | |
1380 // Java code never executes within the yellow zone: the latter is only | |
1381 // there to provoke an exception during stack banging. If java code | |
1382 // is executing there, either StackShadowPages should be larger, or | |
1383 // some exception code in c1, c2 or the interpreter isn't unwinding | |
1384 // when it should. | |
1385 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
1386 | |
1387 enable_stack_yellow_zone(); | |
1388 return true; | |
1389 } | |
1390 | |
1391 bool JavaThread::reguard_stack(void) { | |
1392 return reguard_stack(os::current_stack_pointer()); | |
1393 } | |
1394 | |
1395 | |
1396 void JavaThread::block_if_vm_exited() { | |
1397 if (_terminated == _vm_exited) { | |
1398 // _vm_exited is set at safepoint, and Threads_lock is never released | |
1399 // we will block here forever | |
1400 Threads_lock->lock_without_safepoint_check(); | |
1401 ShouldNotReachHere(); | |
1402 } | |
1403 } | |
1404 | |
1405 | |
1406 // Remove this ifdef when C1 is ported to the compiler interface. | |
1407 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
1408 | |
342
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1409 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1410 Thread() |
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1411 #ifndef SERIALGC |
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1412 , _satb_mark_queue(&_satb_mark_queue_set), |
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1413 _dirty_card_queue(&_dirty_card_queue_set) |
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1414 #endif // !SERIALGC |
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1415 { |
0 | 1416 if (TraceThreadEvents) { |
1417 tty->print_cr("creating thread %p", this); | |
1418 } | |
1419 initialize(); | |
4006 | 1420 _jni_attach_state = _not_attaching_via_jni; |
0 | 1421 set_entry_point(entry_point); |
1422 // Create the native thread itself. | |
1423 // %note runtime_23 | |
1424 os::ThreadType thr_type = os::java_thread; | |
1425 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
1426 os::java_thread; | |
1427 os::create_thread(this, thr_type, stack_sz); | |
1428 | |
1429 // The _osthread may be NULL here because we ran out of memory (too many threads active). | |
1430 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
1431 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
1432 // the exception consists of creating the exception object & initializing it, initialization | |
1433 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
1434 // | |
1435 // The thread is still suspended when we reach here. Thread must be explicit started | |
1436 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
1437 // by calling Threads:add. The reason why this is not done here, is because the thread | |
1438 // object must be fully initialized (take a look at JVM_Start) | |
1439 } | |
1440 | |
1441 JavaThread::~JavaThread() { | |
1442 if (TraceThreadEvents) { | |
1443 tty->print_cr("terminate thread %p", this); | |
1444 } | |
1445 | |
1446 // JSR166 -- return the parker to the free list | |
1447 Parker::Release(_parker); | |
1448 _parker = NULL ; | |
1449 | |
1450 // Free any remaining previous UnrollBlock | |
1451 vframeArray* old_array = vframe_array_last(); | |
1452 | |
1453 if (old_array != NULL) { | |
1454 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
1455 old_array->set_unroll_block(NULL); | |
1456 delete old_info; | |
1457 delete old_array; | |
1458 } | |
1459 | |
1460 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
1461 if (deferred != NULL) { | |
1462 // This can only happen if thread is destroyed before deoptimization occurs. | |
1463 assert(deferred->length() != 0, "empty array!"); | |
1464 do { | |
1465 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
1466 deferred->remove_at(0); | |
1467 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
1468 delete dlv; | |
1469 } while (deferred->length() != 0); | |
1470 delete deferred; | |
1471 } | |
1472 | |
1473 // All Java related clean up happens in exit | |
1474 ThreadSafepointState::destroy(this); | |
1475 if (_thread_profiler != NULL) delete _thread_profiler; | |
1476 if (_thread_stat != NULL) delete _thread_stat; | |
1477 } | |
1478 | |
1479 | |
1480 // The first routine called by a new Java thread | |
1481 void JavaThread::run() { | |
1482 // initialize thread-local alloc buffer related fields | |
1483 this->initialize_tlab(); | |
1484 | |
1485 // used to test validitity of stack trace backs | |
1486 this->record_base_of_stack_pointer(); | |
1487 | |
1488 // Record real stack base and size. | |
1489 this->record_stack_base_and_size(); | |
1490 | |
1491 // Initialize thread local storage; set before calling MutexLocker | |
1492 this->initialize_thread_local_storage(); | |
1493 | |
1494 this->create_stack_guard_pages(); | |
1495 | |
1681
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1496 this->cache_global_variables(); |
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1497 |
0 | 1498 // Thread is now sufficient initialized to be handled by the safepoint code as being |
1499 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
1500 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
1501 | |
1502 assert(JavaThread::current() == this, "sanity check"); | |
1503 assert(!Thread::current()->owns_locks(), "sanity check"); | |
1504 | |
1505 DTRACE_THREAD_PROBE(start, this); | |
1506 | |
1507 // This operation might block. We call that after all safepoint checks for a new thread has | |
1508 // been completed. | |
1509 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1510 | |
1511 if (JvmtiExport::should_post_thread_life()) { | |
1512 JvmtiExport::post_thread_start(this); | |
1513 } | |
1514 | |
1515 // We call another function to do the rest so we are sure that the stack addresses used | |
1516 // from there will be lower than the stack base just computed | |
1517 thread_main_inner(); | |
1518 | |
1519 // Note, thread is no longer valid at this point! | |
1520 } | |
1521 | |
1522 | |
1523 void JavaThread::thread_main_inner() { | |
1524 assert(JavaThread::current() == this, "sanity check"); | |
1525 assert(this->threadObj() != NULL, "just checking"); | |
1526 | |
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1527 // Execute thread entry point unless this thread has a pending exception |
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1528 // or has been stopped before starting. |
0 | 1529 // Note: Due to JVM_StopThread we can have pending exceptions already! |
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1530 if (!this->has_pending_exception() && |
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1531 !java_lang_Thread::is_stillborn(this->threadObj())) { |
4006 | 1532 { |
1533 ResourceMark rm(this); | |
1534 this->set_native_thread_name(this->get_thread_name()); | |
1535 } | |
0 | 1536 HandleMark hm(this); |
1537 this->entry_point()(this, this); | |
1538 } | |
1539 | |
1540 DTRACE_THREAD_PROBE(stop, this); | |
1541 | |
1542 this->exit(false); | |
1543 delete this; | |
1544 } | |
1545 | |
1546 | |
1547 static void ensure_join(JavaThread* thread) { | |
1548 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
1549 Handle threadObj(thread, thread->threadObj()); | |
1550 assert(threadObj.not_null(), "java thread object must exist"); | |
1551 ObjectLocker lock(threadObj, thread); | |
1552 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1553 thread->clear_pending_exception(); | |
1554 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
1555 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
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1556 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1557 // to complete once we've done the notify_all below |
0 | 1558 java_lang_Thread::set_thread(threadObj(), NULL); |
1559 lock.notify_all(thread); | |
1560 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1561 thread->clear_pending_exception(); | |
1562 } | |
1563 | |
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1564 |
0 | 1565 // For any new cleanup additions, please check to see if they need to be applied to |
1566 // cleanup_failed_attach_current_thread as well. | |
1567 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
1568 assert(this == JavaThread::current(), "thread consistency check"); | |
1569 if (!InitializeJavaLangSystem) return; | |
1570 | |
1571 HandleMark hm(this); | |
1572 Handle uncaught_exception(this, this->pending_exception()); | |
1573 this->clear_pending_exception(); | |
1574 Handle threadObj(this, this->threadObj()); | |
1575 assert(threadObj.not_null(), "Java thread object should be created"); | |
1576 | |
1577 if (get_thread_profiler() != NULL) { | |
1578 get_thread_profiler()->disengage(); | |
1579 ResourceMark rm; | |
1580 get_thread_profiler()->print(get_thread_name()); | |
1581 } | |
1582 | |
1583 | |
1584 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
1585 { | |
1586 EXCEPTION_MARK; | |
1587 | |
1588 CLEAR_PENDING_EXCEPTION; | |
1589 } | |
1590 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
1591 // has to be fixed by a runtime query method | |
1592 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
1593 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
1594 // java.lang.Thread.dispatchUncaughtException | |
1595 if (uncaught_exception.not_null()) { | |
1596 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
1597 Events::log("uncaught exception INTPTR_FORMAT " " INTPTR_FORMAT " " INTPTR_FORMAT", | |
1598 (address)uncaught_exception(), (address)threadObj(), (address)group()); | |
1599 { | |
1600 EXCEPTION_MARK; | |
1601 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
1602 // call it. Otherwise we have an older library without the JSR-166 changes, | |
1603 // so call ThreadGroup.uncaughtException() | |
1604 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
1605 CallInfo callinfo; | |
1142 | 1606 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1607 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
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1608 vmSymbols::dispatchUncaughtException_name(), |
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1609 vmSymbols::throwable_void_signature(), |
0 | 1610 KlassHandle(), false, false, THREAD); |
1611 CLEAR_PENDING_EXCEPTION; | |
1612 methodHandle method = callinfo.selected_method(); | |
1613 if (method.not_null()) { | |
1614 JavaValue result(T_VOID); | |
1615 JavaCalls::call_virtual(&result, | |
1616 threadObj, thread_klass, | |
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1617 vmSymbols::dispatchUncaughtException_name(), |
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1618 vmSymbols::throwable_void_signature(), |
0 | 1619 uncaught_exception, |
1620 THREAD); | |
1621 } else { | |
1142 | 1622 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
0 | 1623 JavaValue result(T_VOID); |
1624 JavaCalls::call_virtual(&result, | |
1625 group, thread_group, | |
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1626 vmSymbols::uncaughtException_name(), |
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1627 vmSymbols::thread_throwable_void_signature(), |
0 | 1628 threadObj, // Arg 1 |
1629 uncaught_exception, // Arg 2 | |
1630 THREAD); | |
1631 } | |
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1632 if (HAS_PENDING_EXCEPTION) { |
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1633 ResourceMark rm(this); |
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1634 jio_fprintf(defaultStream::error_stream(), |
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1635 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1636 " in thread \"%s\"\n", |
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1637 Klass::cast(pending_exception()->klass())->external_name(), |
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1638 get_thread_name()); |
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1639 CLEAR_PENDING_EXCEPTION; |
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1640 } |
0 | 1641 } |
1642 } | |
1643 | |
1644 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during | |
1645 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
1646 // is deprecated anyhow. | |
1647 { int count = 3; | |
1648 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
1649 EXCEPTION_MARK; | |
1650 JavaValue result(T_VOID); | |
1142 | 1651 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1652 JavaCalls::call_virtual(&result, |
1653 threadObj, thread_klass, | |
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1654 vmSymbols::exit_method_name(), |
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1655 vmSymbols::void_method_signature(), |
0 | 1656 THREAD); |
1657 CLEAR_PENDING_EXCEPTION; | |
1658 } | |
1659 } | |
1660 | |
1661 // notify JVMTI | |
1662 if (JvmtiExport::should_post_thread_life()) { | |
1663 JvmtiExport::post_thread_end(this); | |
1664 } | |
1665 | |
1666 // We have notified the agents that we are exiting, before we go on, | |
1667 // we must check for a pending external suspend request and honor it | |
1668 // in order to not surprise the thread that made the suspend request. | |
1669 while (true) { | |
1670 { | |
1671 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1672 if (!is_external_suspend()) { | |
1673 set_terminated(_thread_exiting); | |
1674 ThreadService::current_thread_exiting(this); | |
1675 break; | |
1676 } | |
1677 // Implied else: | |
1678 // Things get a little tricky here. We have a pending external | |
1679 // suspend request, but we are holding the SR_lock so we | |
1680 // can't just self-suspend. So we temporarily drop the lock | |
1681 // and then self-suspend. | |
1682 } | |
1683 | |
1684 ThreadBlockInVM tbivm(this); | |
1685 java_suspend_self(); | |
1686 | |
1687 // We're done with this suspend request, but we have to loop around | |
1688 // and check again. Eventually we will get SR_lock without a pending | |
1689 // external suspend request and will be able to mark ourselves as | |
1690 // exiting. | |
1691 } | |
1692 // no more external suspends are allowed at this point | |
1693 } else { | |
1694 // before_exit() has already posted JVMTI THREAD_END events | |
1695 } | |
1696 | |
1697 // Notify waiters on thread object. This has to be done after exit() is called | |
1698 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
1699 // group should have the destroyed bit set before waiters are notified). | |
1700 ensure_join(this); | |
1701 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
1702 | |
1703 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
1704 // held by this thread must be released. A detach operation must only | |
1705 // get here if there are no Java frames on the stack. Therefore, any | |
1706 // owned monitors at this point MUST be JNI-acquired monitors which are | |
1707 // pre-inflated and in the monitor cache. | |
1708 // | |
1709 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
1710 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
1711 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
1712 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
1713 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
1714 } | |
1715 | |
1716 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
1717 // is in a consistent state, in case GC happens | |
1718 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
1719 | |
1720 if (active_handles() != NULL) { | |
1721 JNIHandleBlock* block = active_handles(); | |
1722 set_active_handles(NULL); | |
1723 JNIHandleBlock::release_block(block); | |
1724 } | |
1725 | |
1726 if (free_handle_block() != NULL) { | |
1727 JNIHandleBlock* block = free_handle_block(); | |
1728 set_free_handle_block(NULL); | |
1729 JNIHandleBlock::release_block(block); | |
1730 } | |
1731 | |
1732 // These have to be removed while this is still a valid thread. | |
1733 remove_stack_guard_pages(); | |
1734 | |
1735 if (UseTLAB) { | |
1736 tlab().make_parsable(true); // retire TLAB | |
1737 } | |
1738 | |
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1739 if (JvmtiEnv::environments_might_exist()) { |
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1740 JvmtiExport::cleanup_thread(this); |
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1741 } |
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1742 |
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1743 #ifndef SERIALGC |
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1744 // We must flush G1-related buffers before removing a thread from |
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1745 // the list of active threads. |
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1746 if (UseG1GC) { |
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1747 flush_barrier_queues(); |
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1748 } |
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1749 #endif |
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1750 |
0 | 1751 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
1752 Threads::remove(this); | |
1753 } | |
1754 | |
441
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1755 #ifndef SERIALGC |
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1756 // Flush G1-related queues. |
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1757 void JavaThread::flush_barrier_queues() { |
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1758 satb_mark_queue().flush(); |
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1759 dirty_card_queue().flush(); |
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1760 } |
1842
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1761 |
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1762 void JavaThread::initialize_queues() { |
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1763 assert(!SafepointSynchronize::is_at_safepoint(), |
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1764 "we should not be at a safepoint"); |
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1765 |
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1766 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1767 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1768 // The SATB queue should have been constructed with its active |
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1769 // field set to false. |
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1770 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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1771 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1772 // If we are creating the thread during a marking cycle, we should |
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1773 // set the active field of the SATB queue to true. |
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1774 if (satb_queue_set.is_active()) { |
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1775 satb_queue.set_active(true); |
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1776 } |
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1777 |
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1778 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1779 // The dirty card queue should have been constructed with its |
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1780 // active field set to true. |
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1781 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1782 } |
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1783 #endif // !SERIALGC |
441
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1784 |
0 | 1785 void JavaThread::cleanup_failed_attach_current_thread() { |
441
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1786 if (get_thread_profiler() != NULL) { |
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1787 get_thread_profiler()->disengage(); |
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1788 ResourceMark rm; |
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1789 get_thread_profiler()->print(get_thread_name()); |
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1790 } |
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1791 |
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1792 if (active_handles() != NULL) { |
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1793 JNIHandleBlock* block = active_handles(); |
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1794 set_active_handles(NULL); |
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1795 JNIHandleBlock::release_block(block); |
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1796 } |
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1797 |
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1798 if (free_handle_block() != NULL) { |
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1799 JNIHandleBlock* block = free_handle_block(); |
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1800 set_free_handle_block(NULL); |
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1801 JNIHandleBlock::release_block(block); |
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1802 } |
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1803 |
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1804 // These have to be removed while this is still a valid thread. |
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1805 remove_stack_guard_pages(); |
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1806 |
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1807 if (UseTLAB) { |
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1808 tlab().make_parsable(true); // retire TLAB, if any |
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1809 } |
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1810 |
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1811 #ifndef SERIALGC |
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1812 if (UseG1GC) { |
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1813 flush_barrier_queues(); |
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1814 } |
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1815 #endif |
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1816 |
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1817 Threads::remove(this); |
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1818 delete this; |
0 | 1819 } |
1820 | |
1821 | |
441
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1822 |
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1823 |
0 | 1824 JavaThread* JavaThread::active() { |
1825 Thread* thread = ThreadLocalStorage::thread(); | |
1826 assert(thread != NULL, "just checking"); | |
1827 if (thread->is_Java_thread()) { | |
1828 return (JavaThread*) thread; | |
1829 } else { | |
1830 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
1831 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
1832 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
1833 assert(ret->is_Java_thread(), "must be a Java thread"); | |
1834 return ret; | |
1835 } | |
1836 } | |
1837 | |
1838 bool JavaThread::is_lock_owned(address adr) const { | |
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1839 if (Thread::is_lock_owned(adr)) return true; |
0 | 1840 |
1841 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
1842 if (chunk->contains(adr)) return true; | |
1843 } | |
1844 | |
1845 return false; | |
1846 } | |
1847 | |
1848 | |
1849 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
1850 chunk->set_next(monitor_chunks()); | |
1851 set_monitor_chunks(chunk); | |
1852 } | |
1853 | |
1854 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
1855 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
1856 if (monitor_chunks() == chunk) { | |
1857 set_monitor_chunks(chunk->next()); | |
1858 } else { | |
1859 MonitorChunk* prev = monitor_chunks(); | |
1860 while (prev->next() != chunk) prev = prev->next(); | |
1861 prev->set_next(chunk->next()); | |
1862 } | |
1863 } | |
1864 | |
1865 // JVM support. | |
1866 | |
1867 // Note: this function shouldn't block if it's called in | |
1868 // _thread_in_native_trans state (such as from | |
1869 // check_special_condition_for_native_trans()). | |
1870 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
1871 | |
1872 if (has_last_Java_frame() && has_async_condition()) { | |
1873 // If we are at a polling page safepoint (not a poll return) | |
1874 // then we must defer async exception because live registers | |
1875 // will be clobbered by the exception path. Poll return is | |
1876 // ok because the call we a returning from already collides | |
1877 // with exception handling registers and so there is no issue. | |
1878 // (The exception handling path kills call result registers but | |
1879 // this is ok since the exception kills the result anyway). | |
1880 | |
1881 if (is_at_poll_safepoint()) { | |
1882 // if the code we are returning to has deoptimized we must defer | |
1883 // the exception otherwise live registers get clobbered on the | |
1884 // exception path before deoptimization is able to retrieve them. | |
1885 // | |
1886 RegisterMap map(this, false); | |
1887 frame caller_fr = last_frame().sender(&map); | |
1888 assert(caller_fr.is_compiled_frame(), "what?"); | |
1889 if (caller_fr.is_deoptimized_frame()) { | |
1890 if (TraceExceptions) { | |
1891 ResourceMark rm; | |
1892 tty->print_cr("deferred async exception at compiled safepoint"); | |
1893 } | |
1894 return; | |
1895 } | |
1896 } | |
1897 } | |
1898 | |
1899 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
1900 if (condition == _no_async_condition) { | |
1901 // Conditions have changed since has_special_runtime_exit_condition() | |
1902 // was called: | |
1903 // - if we were here only because of an external suspend request, | |
1904 // then that was taken care of above (or cancelled) so we are done | |
1905 // - if we were here because of another async request, then it has | |
1906 // been cleared between the has_special_runtime_exit_condition() | |
1907 // and now so again we are done | |
1908 return; | |
1909 } | |
1910 | |
1911 // Check for pending async. exception | |
1912 if (_pending_async_exception != NULL) { | |
1913 // Only overwrite an already pending exception, if it is not a threadDeath. | |
1142 | 1914 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 1915 |
1916 // We cannot call Exceptions::_throw(...) here because we cannot block | |
1917 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
1918 | |
1919 if (TraceExceptions) { | |
1920 ResourceMark rm; | |
1921 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
1922 if (has_last_Java_frame() ) { | |
1923 frame f = last_frame(); | |
1924 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
1925 } | |
1926 tty->print_cr(" of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
1927 } | |
1928 _pending_async_exception = NULL; | |
1929 clear_has_async_exception(); | |
1930 } | |
1931 } | |
1932 | |
1933 if (check_unsafe_error && | |
1934 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
1935 condition = _no_async_condition; // done | |
1936 switch (thread_state()) { | |
1937 case _thread_in_vm: | |
1938 { | |
1939 JavaThread* THREAD = this; | |
1940 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
1941 } | |
1942 case _thread_in_native: | |
1943 { | |
1944 ThreadInVMfromNative tiv(this); | |
1945 JavaThread* THREAD = this; | |
1946 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
1947 } | |
1948 case _thread_in_Java: | |
1949 { | |
1950 ThreadInVMfromJava tiv(this); | |
1951 JavaThread* THREAD = this; | |
1952 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
1953 } | |
1954 default: | |
1955 ShouldNotReachHere(); | |
1956 } | |
1957 } | |
1958 | |
1959 assert(condition == _no_async_condition || has_pending_exception() || | |
1960 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
1961 "must have handled the async condition, if no exception"); | |
1962 } | |
1963 | |
1964 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
1965 // | |
1966 // Check for pending external suspend. Internal suspend requests do | |
1967 // not use handle_special_runtime_exit_condition(). | |
1968 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
1969 // thread is not the current thread. In older versions of jdbx, jdbx | |
1970 // threads could call into the VM with another thread's JNIEnv so we | |
1971 // can be here operating on behalf of a suspended thread (4432884). | |
1972 bool do_self_suspend = is_external_suspend_with_lock(); | |
1973 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
1974 // | |
1975 // Because thread is external suspended the safepoint code will count | |
1976 // thread as at a safepoint. This can be odd because we can be here | |
1977 // as _thread_in_Java which would normally transition to _thread_blocked | |
1978 // at a safepoint. We would like to mark the thread as _thread_blocked | |
1979 // before calling java_suspend_self like all other callers of it but | |
1980 // we must then observe proper safepoint protocol. (We can't leave | |
1981 // _thread_blocked with a safepoint in progress). However we can be | |
1982 // here as _thread_in_native_trans so we can't use a normal transition | |
1983 // constructor/destructor pair because they assert on that type of | |
1984 // transition. We could do something like: | |
1985 // | |
1986 // JavaThreadState state = thread_state(); | |
1987 // set_thread_state(_thread_in_vm); | |
1988 // { | |
1989 // ThreadBlockInVM tbivm(this); | |
1990 // java_suspend_self() | |
1991 // } | |
1992 // set_thread_state(_thread_in_vm_trans); | |
1993 // if (safepoint) block; | |
1994 // set_thread_state(state); | |
1995 // | |
1996 // but that is pretty messy. Instead we just go with the way the | |
1997 // code has worked before and note that this is the only path to | |
1998 // java_suspend_self that doesn't put the thread in _thread_blocked | |
1999 // mode. | |
2000 | |
2001 frame_anchor()->make_walkable(this); | |
2002 java_suspend_self(); | |
2003 | |
2004 // We might be here for reasons in addition to the self-suspend request | |
2005 // so check for other async requests. | |
2006 } | |
2007 | |
2008 if (check_asyncs) { | |
2009 check_and_handle_async_exceptions(); | |
2010 } | |
2011 } | |
2012 | |
2013 void JavaThread::send_thread_stop(oop java_throwable) { | |
2014 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
2015 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
2016 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
2017 | |
2018 // Do not throw asynchronous exceptions against the compiler thread | |
2019 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
2020 if (is_Compiler_thread()) return; | |
2021 | |
2022 { | |
2023 // Actually throw the Throwable against the target Thread - however | |
2024 // only if there is no thread death exception installed already. | |
1142 | 2025 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 2026 // If the topmost frame is a runtime stub, then we are calling into |
2027 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
2028 // must deoptimize the caller before continuing, as the compiled exception handler table | |
2029 // may not be valid | |
2030 if (has_last_Java_frame()) { | |
2031 frame f = last_frame(); | |
2032 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
2033 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2034 RegisterMap reg_map(this, UseBiasedLocking); | |
2035 frame compiled_frame = f.sender(®_map); | |
2036 if (compiled_frame.can_be_deoptimized()) { | |
2037 Deoptimization::deoptimize(this, compiled_frame, ®_map); | |
2038 } | |
2039 } | |
2040 } | |
2041 | |
2042 // Set async. pending exception in thread. | |
2043 set_pending_async_exception(java_throwable); | |
2044 | |
2045 if (TraceExceptions) { | |
2046 ResourceMark rm; | |
2047 tty->print_cr("Pending Async. exception installed of type: %s", instanceKlass::cast(_pending_async_exception->klass())->external_name()); | |
2048 } | |
2049 // for AbortVMOnException flag | |
2050 NOT_PRODUCT(Exceptions::debug_check_abort(instanceKlass::cast(_pending_async_exception->klass())->external_name())); | |
2051 } | |
2052 } | |
2053 | |
2054 | |
2055 // Interrupt thread so it will wake up from a potential wait() | |
2056 Thread::interrupt(this); | |
2057 } | |
2058 | |
2059 // External suspension mechanism. | |
2060 // | |
2061 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
2062 // to any VM_locks and it is at a transition | |
2063 // Self-suspension will happen on the transition out of the vm. | |
2064 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
2065 // | |
2066 // Guarantees on return: | |
2067 // + Target thread will not execute any new bytecode (that's why we need to | |
2068 // force a safepoint) | |
2069 // + Target thread will not enter any new monitors | |
2070 // | |
2071 void JavaThread::java_suspend() { | |
2072 { MutexLocker mu(Threads_lock); | |
2073 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
2074 return; | |
2075 } | |
2076 } | |
2077 | |
2078 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2079 if (!is_external_suspend()) { | |
2080 // a racing resume has cancelled us; bail out now | |
2081 return; | |
2082 } | |
2083 | |
2084 // suspend is done | |
2085 uint32_t debug_bits = 0; | |
2086 // Warning: is_ext_suspend_completed() may temporarily drop the | |
2087 // SR_lock to allow the thread to reach a stable thread state if | |
2088 // it is currently in a transient thread state. | |
2089 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
2090 SuspendRetryDelay, &debug_bits) ) { | |
2091 return; | |
2092 } | |
2093 } | |
2094 | |
2095 VM_ForceSafepoint vm_suspend; | |
2096 VMThread::execute(&vm_suspend); | |
2097 } | |
2098 | |
2099 // Part II of external suspension. | |
2100 // A JavaThread self suspends when it detects a pending external suspend | |
2101 // request. This is usually on transitions. It is also done in places | |
2102 // where continuing to the next transition would surprise the caller, | |
2103 // e.g., monitor entry. | |
2104 // | |
2105 // Returns the number of times that the thread self-suspended. | |
2106 // | |
2107 // Note: DO NOT call java_suspend_self() when you just want to block current | |
2108 // thread. java_suspend_self() is the second stage of cooperative | |
2109 // suspension for external suspend requests and should only be used | |
2110 // to complete an external suspend request. | |
2111 // | |
2112 int JavaThread::java_suspend_self() { | |
2113 int ret = 0; | |
2114 | |
2115 // we are in the process of exiting so don't suspend | |
2116 if (is_exiting()) { | |
2117 clear_external_suspend(); | |
2118 return ret; | |
2119 } | |
2120 | |
2121 assert(_anchor.walkable() || | |
2122 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
2123 "must have walkable stack"); | |
2124 | |
2125 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2126 | |
979 | 2127 assert(!this->is_ext_suspended(), |
0 | 2128 "a thread trying to self-suspend should not already be suspended"); |
2129 | |
2130 if (this->is_suspend_equivalent()) { | |
2131 // If we are self-suspending as a result of the lifting of a | |
2132 // suspend equivalent condition, then the suspend_equivalent | |
2133 // flag is not cleared until we set the ext_suspended flag so | |
2134 // that wait_for_ext_suspend_completion() returns consistent | |
2135 // results. | |
2136 this->clear_suspend_equivalent(); | |
2137 } | |
2138 | |
2139 // A racing resume may have cancelled us before we grabbed SR_lock | |
2140 // above. Or another external suspend request could be waiting for us | |
2141 // by the time we return from SR_lock()->wait(). The thread | |
2142 // that requested the suspension may already be trying to walk our | |
2143 // stack and if we return now, we can change the stack out from under | |
2144 // it. This would be a "bad thing (TM)" and cause the stack walker | |
2145 // to crash. We stay self-suspended until there are no more pending | |
2146 // external suspend requests. | |
2147 while (is_external_suspend()) { | |
2148 ret++; | |
2149 this->set_ext_suspended(); | |
2150 | |
2151 // _ext_suspended flag is cleared by java_resume() | |
2152 while (is_ext_suspended()) { | |
2153 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
2154 } | |
2155 } | |
2156 | |
2157 return ret; | |
2158 } | |
2159 | |
2160 #ifdef ASSERT | |
2161 // verify the JavaThread has not yet been published in the Threads::list, and | |
2162 // hence doesn't need protection from concurrent access at this stage | |
2163 void JavaThread::verify_not_published() { | |
2164 if (!Threads_lock->owned_by_self()) { | |
2165 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
2166 assert( !Threads::includes(this), | |
2167 "java thread shouldn't have been published yet!"); | |
2168 } | |
2169 else { | |
2170 assert( !Threads::includes(this), | |
2171 "java thread shouldn't have been published yet!"); | |
2172 } | |
2173 } | |
2174 #endif | |
2175 | |
2176 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2177 // progress or when _suspend_flags is non-zero. | |
2178 // Current thread needs to self-suspend if there is a suspend request and/or | |
2179 // block if a safepoint is in progress. | |
2180 // Async exception ISN'T checked. | |
2181 // Note only the ThreadInVMfromNative transition can call this function | |
2182 // directly and when thread state is _thread_in_native_trans | |
2183 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
2184 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
2185 | |
2186 JavaThread *curJT = JavaThread::current(); | |
2187 bool do_self_suspend = thread->is_external_suspend(); | |
2188 | |
2189 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
2190 | |
2191 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2192 // thread is not the current thread. In older versions of jdbx, jdbx | |
2193 // threads could call into the VM with another thread's JNIEnv so we | |
2194 // can be here operating on behalf of a suspended thread (4432884). | |
2195 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
2196 JavaThreadState state = thread->thread_state(); | |
2197 | |
2198 // We mark this thread_blocked state as a suspend-equivalent so | |
2199 // that a caller to is_ext_suspend_completed() won't be confused. | |
2200 // The suspend-equivalent state is cleared by java_suspend_self(). | |
2201 thread->set_suspend_equivalent(); | |
2202 | |
2203 // If the safepoint code sees the _thread_in_native_trans state, it will | |
2204 // wait until the thread changes to other thread state. There is no | |
2205 // guarantee on how soon we can obtain the SR_lock and complete the | |
2206 // self-suspend request. It would be a bad idea to let safepoint wait for | |
2207 // too long. Temporarily change the state to _thread_blocked to | |
2208 // let the VM thread know that this thread is ready for GC. The problem | |
2209 // of changing thread state is that safepoint could happen just after | |
2210 // java_suspend_self() returns after being resumed, and VM thread will | |
2211 // see the _thread_blocked state. We must check for safepoint | |
2212 // after restoring the state and make sure we won't leave while a safepoint | |
2213 // is in progress. | |
2214 thread->set_thread_state(_thread_blocked); | |
2215 thread->java_suspend_self(); | |
2216 thread->set_thread_state(state); | |
2217 // Make sure new state is seen by VM thread | |
2218 if (os::is_MP()) { | |
2219 if (UseMembar) { | |
2220 // Force a fence between the write above and read below | |
2221 OrderAccess::fence(); | |
2222 } else { | |
2223 // Must use this rather than serialization page in particular on Windows | |
2224 InterfaceSupport::serialize_memory(thread); | |
2225 } | |
2226 } | |
2227 } | |
2228 | |
2229 if (SafepointSynchronize::do_call_back()) { | |
2230 // If we are safepointing, then block the caller which may not be | |
2231 // the same as the target thread (see above). | |
2232 SafepointSynchronize::block(curJT); | |
2233 } | |
2234 | |
2235 if (thread->is_deopt_suspend()) { | |
2236 thread->clear_deopt_suspend(); | |
2237 RegisterMap map(thread, false); | |
2238 frame f = thread->last_frame(); | |
2239 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
2240 f = f.sender(&map); | |
2241 } | |
2242 if (f.id() == thread->must_deopt_id()) { | |
2243 thread->clear_must_deopt_id(); | |
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2244 f.deoptimize(thread); |
0 | 2245 } else { |
2246 fatal("missed deoptimization!"); | |
2247 } | |
2248 } | |
2249 } | |
2250 | |
2251 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2252 // progress or when _suspend_flags is non-zero. | |
2253 // Current thread needs to self-suspend if there is a suspend request and/or | |
2254 // block if a safepoint is in progress. | |
2255 // Also check for pending async exception (not including unsafe access error). | |
2256 // Note only the native==>VM/Java barriers can call this function and when | |
2257 // thread state is _thread_in_native_trans. | |
2258 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
2259 check_safepoint_and_suspend_for_native_trans(thread); | |
2260 | |
2261 if (thread->has_async_exception()) { | |
2262 // We are in _thread_in_native_trans state, don't handle unsafe | |
2263 // access error since that may block. | |
2264 thread->check_and_handle_async_exceptions(false); | |
2265 } | |
2266 } | |
2267 | |
2268 // We need to guarantee the Threads_lock here, since resumes are not | |
2269 // allowed during safepoint synchronization | |
2270 // Can only resume from an external suspension | |
2271 void JavaThread::java_resume() { | |
2272 assert_locked_or_safepoint(Threads_lock); | |
2273 | |
2274 // Sanity check: thread is gone, has started exiting or the thread | |
2275 // was not externally suspended. | |
2276 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
2277 return; | |
2278 } | |
2279 | |
2280 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2281 | |
2282 clear_external_suspend(); | |
2283 | |
2284 if (is_ext_suspended()) { | |
2285 clear_ext_suspended(); | |
2286 SR_lock()->notify_all(); | |
2287 } | |
2288 } | |
2289 | |
2290 void JavaThread::create_stack_guard_pages() { | |
2291 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
2292 address low_addr = stack_base() - stack_size(); | |
2293 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2294 | |
2295 int allocate = os::allocate_stack_guard_pages(); | |
2296 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
2297 | |
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2298 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
0 | 2299 warning("Attempt to allocate stack guard pages failed."); |
2300 return; | |
2301 } | |
2302 | |
2303 if (os::guard_memory((char *) low_addr, len)) { | |
2304 _stack_guard_state = stack_guard_enabled; | |
2305 } else { | |
2306 warning("Attempt to protect stack guard pages failed."); | |
2307 if (os::uncommit_memory((char *) low_addr, len)) { | |
2308 warning("Attempt to deallocate stack guard pages failed."); | |
2309 } | |
2310 } | |
2311 } | |
2312 | |
2313 void JavaThread::remove_stack_guard_pages() { | |
2314 if (_stack_guard_state == stack_guard_unused) return; | |
2315 address low_addr = stack_base() - stack_size(); | |
2316 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2317 | |
2318 if (os::allocate_stack_guard_pages()) { | |
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2319 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
0 | 2320 _stack_guard_state = stack_guard_unused; |
2321 } else { | |
2322 warning("Attempt to deallocate stack guard pages failed."); | |
2323 } | |
2324 } else { | |
2325 if (_stack_guard_state == stack_guard_unused) return; | |
2326 if (os::unguard_memory((char *) low_addr, len)) { | |
2327 _stack_guard_state = stack_guard_unused; | |
2328 } else { | |
2329 warning("Attempt to unprotect stack guard pages failed."); | |
2330 } | |
2331 } | |
2332 } | |
2333 | |
2334 void JavaThread::enable_stack_yellow_zone() { | |
2335 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2336 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
2337 | |
2338 // The base notation is from the stacks point of view, growing downward. | |
2339 // We need to adjust it to work correctly with guard_memory() | |
2340 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2341 | |
2342 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
2343 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
2344 | |
2345 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
2346 _stack_guard_state = stack_guard_enabled; | |
2347 } else { | |
2348 warning("Attempt to guard stack yellow zone failed."); | |
2349 } | |
2350 enable_register_stack_guard(); | |
2351 } | |
2352 | |
2353 void JavaThread::disable_stack_yellow_zone() { | |
2354 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2355 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
2356 | |
2357 // Simply return if called for a thread that does not use guard pages. | |
2358 if (_stack_guard_state == stack_guard_unused) return; | |
2359 | |
2360 // The base notation is from the stacks point of view, growing downward. | |
2361 // We need to adjust it to work correctly with guard_memory() | |
2362 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2363 | |
2364 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
2365 _stack_guard_state = stack_guard_yellow_disabled; | |
2366 } else { | |
2367 warning("Attempt to unguard stack yellow zone failed."); | |
2368 } | |
2369 disable_register_stack_guard(); | |
2370 } | |
2371 | |
2372 void JavaThread::enable_stack_red_zone() { | |
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 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2376 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2377 | |
2378 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
2379 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
2380 | |
2381 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
2382 warning("Attempt to guard stack red zone failed."); | |
2383 } | |
2384 } | |
2385 | |
2386 void JavaThread::disable_stack_red_zone() { | |
2387 // The base notation is from the stacks point of view, growing downward. | |
2388 // We need to adjust it to work correctly with guard_memory() | |
2389 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2390 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2391 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
2392 warning("Attempt to unguard stack red zone failed."); | |
2393 } | |
2394 } | |
2395 | |
2396 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
2397 // ignore is there is no stack | |
2398 if (!has_last_Java_frame()) return; | |
2399 // traverse the stack frames. Starts from top frame. | |
2400 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2401 frame* fr = fst.current(); | |
2402 f(fr, fst.register_map()); | |
2403 } | |
2404 } | |
2405 | |
2406 | |
2407 #ifndef PRODUCT | |
2408 // Deoptimization | |
2409 // Function for testing deoptimization | |
2410 void JavaThread::deoptimize() { | |
2411 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2412 StackFrameStream fst(this, UseBiasedLocking); | |
2413 bool deopt = false; // Dump stack only if a deopt actually happens. | |
2414 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
2415 // Iterate over all frames in the thread and deoptimize | |
2416 for(; !fst.is_done(); fst.next()) { | |
2417 if(fst.current()->can_be_deoptimized()) { | |
2418 | |
2419 if (only_at) { | |
2420 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
2421 // consists of comma or carriage return separated numbers so | |
2422 // search for the current bci in that string. | |
2423 address pc = fst.current()->pc(); | |
2424 nmethod* nm = (nmethod*) fst.current()->cb(); | |
2425 ScopeDesc* sd = nm->scope_desc_at( pc); | |
2426 char buffer[8]; | |
2427 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
2428 size_t len = strlen(buffer); | |
2429 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
2430 while (found != NULL) { | |
2431 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
2432 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
2433 // Check that the bci found is bracketed by terminators. | |
2434 break; | |
2435 } | |
2436 found = strstr(found + 1, buffer); | |
2437 } | |
2438 if (!found) { | |
2439 continue; | |
2440 } | |
2441 } | |
2442 | |
2443 if (DebugDeoptimization && !deopt) { | |
2444 deopt = true; // One-time only print before deopt | |
2445 tty->print_cr("[BEFORE Deoptimization]"); | |
2446 trace_frames(); | |
2447 trace_stack(); | |
2448 } | |
2449 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2450 } | |
2451 } | |
2452 | |
2453 if (DebugDeoptimization && deopt) { | |
2454 tty->print_cr("[AFTER Deoptimization]"); | |
2455 trace_frames(); | |
2456 } | |
2457 } | |
2458 | |
2459 | |
2460 // Make zombies | |
2461 void JavaThread::make_zombies() { | |
2462 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2463 if (fst.current()->can_be_deoptimized()) { | |
2464 // it is a Java nmethod | |
2465 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
2466 nm->make_not_entrant(); | |
2467 } | |
2468 } | |
2469 } | |
2470 #endif // PRODUCT | |
2471 | |
2472 | |
2473 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
2474 if (!has_last_Java_frame()) return; | |
2475 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2476 StackFrameStream fst(this, UseBiasedLocking); | |
2477 for(; !fst.is_done(); fst.next()) { | |
2478 if (fst.current()->should_be_deoptimized()) { | |
2479 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2480 } | |
2481 } | |
2482 } | |
2483 | |
2484 | |
2485 // GC support | |
2486 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
2487 | |
2488 void JavaThread::gc_epilogue() { | |
2489 frames_do(frame_gc_epilogue); | |
2490 } | |
2491 | |
2492 | |
2493 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
2494 | |
2495 void JavaThread::gc_prologue() { | |
2496 frames_do(frame_gc_prologue); | |
2497 } | |
2498 | |
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2499 // If the caller is a NamedThread, then remember, in the current scope, |
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2500 // the given JavaThread in its _processed_thread field. |
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2501 class RememberProcessedThread: public StackObj { |
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2502 NamedThread* _cur_thr; |
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2503 public: |
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2504 RememberProcessedThread(JavaThread* jthr) { |
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2505 Thread* thread = Thread::current(); |
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2506 if (thread->is_Named_thread()) { |
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2507 _cur_thr = (NamedThread *)thread; |
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2508 _cur_thr->set_processed_thread(jthr); |
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2509 } else { |
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2510 _cur_thr = NULL; |
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2511 } |
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|
2512 } |
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2513 |
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2514 ~RememberProcessedThread() { |
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2515 if (_cur_thr) { |
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2516 _cur_thr->set_processed_thread(NULL); |
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2517 } |
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|
2518 } |
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2519 }; |
0 | 2520 |
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2521 void JavaThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
1166 | 2522 // Verify that the deferred card marks have been flushed. |
2523 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
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2524 |
0 | 2525 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
2526 // since there may be more than one thread using each ThreadProfiler. | |
2527 | |
2528 // Traverse the GCHandles | |
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2529 Thread::oops_do(f, cf); |
0 | 2530 |
2531 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2532 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2533 | |
2534 if (has_last_Java_frame()) { | |
1119
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2535 // Record JavaThread to GC thread |
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|
2536 RememberProcessedThread rpt(this); |
0 | 2537 |
2538 // Traverse the privileged stack | |
2539 if (_privileged_stack_top != NULL) { | |
2540 _privileged_stack_top->oops_do(f); | |
2541 } | |
2542 | |
2543 // traverse the registered growable array | |
2544 if (_array_for_gc != NULL) { | |
2545 for (int index = 0; index < _array_for_gc->length(); index++) { | |
2546 f->do_oop(_array_for_gc->adr_at(index)); | |
2547 } | |
2548 } | |
2549 | |
2550 // Traverse the monitor chunks | |
2551 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
2552 chunk->oops_do(f); | |
2553 } | |
2554 | |
2555 // Traverse the execution stack | |
2556 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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2557 fst.current()->oops_do(f, cf, fst.register_map()); |
0 | 2558 } |
2559 } | |
2560 | |
2561 // callee_target is never live across a gc point so NULL it here should | |
2562 // it still contain a methdOop. | |
2563 | |
2564 set_callee_target(NULL); | |
2565 | |
2566 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
2567 // If we have deferred set_locals there might be oops waiting to be | |
2568 // written | |
2569 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
2570 if (list != NULL) { | |
2571 for (int i = 0; i < list->length(); i++) { | |
2572 list->at(i)->oops_do(f); | |
2573 } | |
2574 } | |
2575 | |
2576 // Traverse instance variables at the end since the GC may be moving things | |
2577 // around using this function | |
2578 f->do_oop((oop*) &_threadObj); | |
2579 f->do_oop((oop*) &_vm_result); | |
2580 f->do_oop((oop*) &_vm_result_2); | |
2581 f->do_oop((oop*) &_exception_oop); | |
2582 f->do_oop((oop*) &_pending_async_exception); | |
2583 | |
2584 if (jvmti_thread_state() != NULL) { | |
2585 jvmti_thread_state()->oops_do(f); | |
2586 } | |
2587 } | |
2588 | |
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2589 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
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2590 Thread::nmethods_do(cf); // (super method is a no-op) |
0 | 2591 |
2592 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2593 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2594 | |
2595 if (has_last_Java_frame()) { | |
2596 // Traverse the execution stack | |
2597 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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|
2598 fst.current()->nmethods_do(cf); |
0 | 2599 } |
2600 } | |
2601 } | |
2602 | |
2603 // Printing | |
2604 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
2605 switch (_thread_state) { | |
2606 case _thread_uninitialized: return "_thread_uninitialized"; | |
2607 case _thread_new: return "_thread_new"; | |
2608 case _thread_new_trans: return "_thread_new_trans"; | |
2609 case _thread_in_native: return "_thread_in_native"; | |
2610 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
2611 case _thread_in_vm: return "_thread_in_vm"; | |
2612 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
2613 case _thread_in_Java: return "_thread_in_Java"; | |
2614 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
2615 case _thread_blocked: return "_thread_blocked"; | |
2616 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
2617 default: return "unknown thread state"; | |
2618 } | |
2619 } | |
2620 | |
2621 #ifndef PRODUCT | |
2622 void JavaThread::print_thread_state_on(outputStream *st) const { | |
2623 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
2624 }; | |
2625 void JavaThread::print_thread_state() const { | |
2626 print_thread_state_on(tty); | |
2627 }; | |
2628 #endif // PRODUCT | |
2629 | |
2630 // Called by Threads::print() for VM_PrintThreads operation | |
2631 void JavaThread::print_on(outputStream *st) const { | |
2632 st->print("\"%s\" ", get_thread_name()); | |
2633 oop thread_oop = threadObj(); | |
2634 if (thread_oop != NULL && java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
2635 Thread::print_on(st); | |
2636 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
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|
2637 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
0 | 2638 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
2639 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
2640 } | |
2641 #ifndef PRODUCT | |
2642 print_thread_state_on(st); | |
2643 _safepoint_state->print_on(st); | |
2644 #endif // PRODUCT | |
2645 } | |
2646 | |
2647 // Called by fatal error handler. The difference between this and | |
2648 // JavaThread::print() is that we can't grab lock or allocate memory. | |
2649 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
2650 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
2651 oop thread_obj = threadObj(); | |
2652 if (thread_obj != NULL) { | |
2653 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
2654 } | |
2655 st->print(" ["); | |
2656 st->print("%s", _get_thread_state_name(_thread_state)); | |
2657 if (osthread()) { | |
2658 st->print(", id=%d", osthread()->thread_id()); | |
2659 } | |
2660 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
2661 _stack_base - _stack_size, _stack_base); | |
2662 st->print("]"); | |
2663 return; | |
2664 } | |
2665 | |
2666 // Verification | |
2667 | |
2668 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
2669 | |
2670 void JavaThread::verify() { | |
2671 // Verify oops in the thread. | |
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|
2672 oops_do(&VerifyOopClosure::verify_oop, NULL); |
0 | 2673 |
2674 // Verify the stack frames. | |
2675 frames_do(frame_verify); | |
2676 } | |
2677 | |
2678 // CR 6300358 (sub-CR 2137150) | |
2679 // Most callers of this method assume that it can't return NULL but a | |
2680 // thread may not have a name whilst it is in the process of attaching to | |
2681 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
2682 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
2683 // if vm exit occurs during initialization). These cases can all be accounted | |
2684 // for such that this method never returns NULL. | |
2685 const char* JavaThread::get_thread_name() const { | |
2686 #ifdef ASSERT | |
2687 // early safepoints can hit while current thread does not yet have TLS | |
2688 if (!SafepointSynchronize::is_at_safepoint()) { | |
2689 Thread *cur = Thread::current(); | |
2690 if (!(cur->is_Java_thread() && cur == this)) { | |
2691 // Current JavaThreads are allowed to get their own name without | |
2692 // the Threads_lock. | |
2693 assert_locked_or_safepoint(Threads_lock); | |
2694 } | |
2695 } | |
2696 #endif // ASSERT | |
2697 return get_thread_name_string(); | |
2698 } | |
2699 | |
2700 // Returns a non-NULL representation of this thread's name, or a suitable | |
2701 // descriptive string if there is no set name | |
2702 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
2703 const char* name_str; | |
2704 oop thread_obj = threadObj(); | |
2705 if (thread_obj != NULL) { | |
2706 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
2707 if (name != NULL) { | |
2708 if (buf == NULL) { | |
2709 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2710 } | |
2711 else { | |
2712 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
2713 } | |
2714 } | |
4006 | 2715 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 |
0 | 2716 name_str = "<no-name - thread is attaching>"; |
2717 } | |
2718 else { | |
2719 name_str = Thread::name(); | |
2720 } | |
2721 } | |
2722 else { | |
2723 name_str = Thread::name(); | |
2724 } | |
2725 assert(name_str != NULL, "unexpected NULL thread name"); | |
2726 return name_str; | |
2727 } | |
2728 | |
2729 | |
2730 const char* JavaThread::get_threadgroup_name() const { | |
2731 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2732 oop thread_obj = threadObj(); | |
2733 if (thread_obj != NULL) { | |
2734 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2735 if (thread_group != NULL) { | |
2736 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
2737 // ThreadGroup.name can be null | |
2738 if (name != NULL) { | |
2739 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2740 return str; | |
2741 } | |
2742 } | |
2743 } | |
2744 return NULL; | |
2745 } | |
2746 | |
2747 const char* JavaThread::get_parent_name() const { | |
2748 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2749 oop thread_obj = threadObj(); | |
2750 if (thread_obj != NULL) { | |
2751 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2752 if (thread_group != NULL) { | |
2753 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
2754 if (parent != NULL) { | |
2755 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
2756 // ThreadGroup.name can be null | |
2757 if (name != NULL) { | |
2758 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2759 return str; | |
2760 } | |
2761 } | |
2762 } | |
2763 } | |
2764 return NULL; | |
2765 } | |
2766 | |
2767 ThreadPriority JavaThread::java_priority() const { | |
2768 oop thr_oop = threadObj(); | |
2769 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
2770 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
2771 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
2772 return priority; | |
2773 } | |
2774 | |
2775 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
2776 | |
2777 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
2778 // Link Java Thread object <-> C++ Thread | |
2779 | |
2780 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
2781 // and put it into a new Handle. The Handle "thread_oop" can then | |
2782 // be used to pass the C++ thread object to other methods. | |
2783 | |
2784 // Set the Java level thread object (jthread) field of the | |
2785 // new thread (a JavaThread *) to C++ thread object using the | |
2786 // "thread_oop" handle. | |
2787 | |
2788 // Set the thread field (a JavaThread *) of the | |
2789 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
2790 | |
2791 Handle thread_oop(Thread::current(), | |
2792 JNIHandles::resolve_non_null(jni_thread)); | |
2793 assert(instanceKlass::cast(thread_oop->klass())->is_linked(), | |
2794 "must be initialized"); | |
2795 set_threadObj(thread_oop()); | |
2796 java_lang_Thread::set_thread(thread_oop(), this); | |
2797 | |
2798 if (prio == NoPriority) { | |
2799 prio = java_lang_Thread::priority(thread_oop()); | |
2800 assert(prio != NoPriority, "A valid priority should be present"); | |
2801 } | |
2802 | |
2803 // Push the Java priority down to the native thread; needs Threads_lock | |
2804 Thread::set_priority(this, prio); | |
2805 | |
2806 // Add the new thread to the Threads list and set it in motion. | |
2807 // We must have threads lock in order to call Threads::add. | |
2808 // It is crucial that we do not block before the thread is | |
2809 // added to the Threads list for if a GC happens, then the java_thread oop | |
2810 // will not be visited by GC. | |
2811 Threads::add(this); | |
2812 } | |
2813 | |
2814 oop JavaThread::current_park_blocker() { | |
2815 // Support for JSR-166 locks | |
2816 oop thread_oop = threadObj(); | |
242 | 2817 if (thread_oop != NULL && |
2818 JDK_Version::current().supports_thread_park_blocker()) { | |
0 | 2819 return java_lang_Thread::park_blocker(thread_oop); |
2820 } | |
2821 return NULL; | |
2822 } | |
2823 | |
2824 | |
2825 void JavaThread::print_stack_on(outputStream* st) { | |
2826 if (!has_last_Java_frame()) return; | |
2827 ResourceMark rm; | |
2828 HandleMark hm; | |
2829 | |
2830 RegisterMap reg_map(this); | |
2831 vframe* start_vf = last_java_vframe(®_map); | |
2832 int count = 0; | |
2833 for (vframe* f = start_vf; f; f = f->sender() ) { | |
2834 if (f->is_java_frame()) { | |
2835 javaVFrame* jvf = javaVFrame::cast(f); | |
2836 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
2837 | |
2838 // Print out lock information | |
2839 if (JavaMonitorsInStackTrace) { | |
2840 jvf->print_lock_info_on(st, count); | |
2841 } | |
2842 } else { | |
2843 // Ignore non-Java frames | |
2844 } | |
2845 | |
2846 // Bail-out case for too deep stacks | |
2847 count++; | |
2848 if (MaxJavaStackTraceDepth == count) return; | |
2849 } | |
2850 } | |
2851 | |
2852 | |
2853 // JVMTI PopFrame support | |
2854 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
2855 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
2856 if (in_bytes(size_in_bytes) != 0) { | |
2857 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes)); | |
2858 _popframe_preserved_args_size = in_bytes(size_in_bytes); | |
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2859 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
0 | 2860 } |
2861 } | |
2862 | |
2863 void* JavaThread::popframe_preserved_args() { | |
2864 return _popframe_preserved_args; | |
2865 } | |
2866 | |
2867 ByteSize JavaThread::popframe_preserved_args_size() { | |
2868 return in_ByteSize(_popframe_preserved_args_size); | |
2869 } | |
2870 | |
2871 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
2872 int sz = in_bytes(popframe_preserved_args_size()); | |
2873 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
2874 return in_WordSize(sz / wordSize); | |
2875 } | |
2876 | |
2877 void JavaThread::popframe_free_preserved_args() { | |
2878 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
2879 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args); | |
2880 _popframe_preserved_args = NULL; | |
2881 _popframe_preserved_args_size = 0; | |
2882 } | |
2883 | |
2884 #ifndef PRODUCT | |
2885 | |
2886 void JavaThread::trace_frames() { | |
2887 tty->print_cr("[Describe stack]"); | |
2888 int frame_no = 1; | |
2889 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2890 tty->print(" %d. ", frame_no++); | |
2891 fst.current()->print_value_on(tty,this); | |
2892 tty->cr(); | |
2893 } | |
2894 } | |
2895 | |
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diff
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2896 class PrintAndVerifyOopClosure: public OopClosure { |
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diff
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|
2897 protected: |
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diff
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|
2898 template <class T> inline void do_oop_work(T* p) { |
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|
2899 oop obj = oopDesc::load_decode_heap_oop(p); |
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2900 if (obj == NULL) return; |
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diff
changeset
|
2901 tty->print(INTPTR_FORMAT ": ", p); |
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diff
changeset
|
2902 if (obj->is_oop_or_null()) { |
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diff
changeset
|
2903 if (obj->is_objArray()) { |
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diff
changeset
|
2904 tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj); |
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diff
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|
2905 } else { |
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diff
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|
2906 obj->print(); |
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|
2907 } |
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|
2908 } else { |
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changeset
|
2909 tty->print_cr("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj); |
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|
2910 } |
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|
2911 tty->cr(); |
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diff
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|
2912 } |
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3899
diff
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|
2913 public: |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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|
2914 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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|
2915 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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changeset
|
2916 }; |
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|
2917 |
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|
2918 |
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|
2919 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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|
2920 PrintAndVerifyOopClosure print; |
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|
2921 f->print_value(); |
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|
2922 f->oops_do(&print, NULL, (RegisterMap*)map); |
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|
2923 } |
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|
2924 |
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|
2925 // Print our all the locations that contain oops and whether they are |
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|
2926 // valid or not. This useful when trying to find the oldest frame |
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|
2927 // where an oop has gone bad since the frame walk is from youngest to |
7588156f5cf9
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|
2928 // oldest. |
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|
2929 void JavaThread::trace_oops() { |
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|
2930 tty->print_cr("[Trace oops]"); |
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|
2931 frames_do(oops_print); |
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|
2932 } |
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|
2933 |
0 | 2934 |
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
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3384
diff
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|
2935 #ifdef ASSERT |
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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diff
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|
2936 // Print or validate the layout of stack frames |
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diff
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|
2937 void JavaThread::print_frame_layout(int depth, bool validate_only) { |
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parents:
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diff
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|
2938 ResourceMark rm; |
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parents:
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diff
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|
2939 PRESERVE_EXCEPTION_MARK; |
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
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diff
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|
2940 FrameValues values; |
2e038ad0c1d0
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parents:
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diff
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|
2941 int frame_no = 0; |
2e038ad0c1d0
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diff
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|
2942 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) { |
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diff
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|
2943 fst.current()->describe(values, ++frame_no); |
2e038ad0c1d0
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diff
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|
2944 if (depth == frame_no) break; |
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diff
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|
2945 } |
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diff
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|
2946 if (validate_only) { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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diff
changeset
|
2947 values.validate(); |
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diff
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|
2948 } else { |
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diff
changeset
|
2949 tty->print_cr("[Describe stack layout]"); |
4042
b20d64f83668
7090904: JSR 292: JRuby junit test crashes in PSScavengeRootsClosure::do_oop
twisti
parents:
4007
diff
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|
2950 values.print(this); |
3336
2e038ad0c1d0
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diff
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|
2951 } |
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diff
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|
2952 } |
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
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|
2953 #endif |
3336
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|
2954 |
0 | 2955 void JavaThread::trace_stack_from(vframe* start_vf) { |
2956 ResourceMark rm; | |
2957 int vframe_no = 1; | |
2958 for (vframe* f = start_vf; f; f = f->sender() ) { | |
2959 if (f->is_java_frame()) { | |
2960 javaVFrame::cast(f)->print_activation(vframe_no++); | |
2961 } else { | |
2962 f->print(); | |
2963 } | |
2964 if (vframe_no > StackPrintLimit) { | |
2965 tty->print_cr("...<more frames>..."); | |
2966 return; | |
2967 } | |
2968 } | |
2969 } | |
2970 | |
2971 | |
2972 void JavaThread::trace_stack() { | |
2973 if (!has_last_Java_frame()) return; | |
2974 ResourceMark rm; | |
2975 HandleMark hm; | |
2976 RegisterMap reg_map(this); | |
2977 trace_stack_from(last_java_vframe(®_map)); | |
2978 } | |
2979 | |
2980 | |
2981 #endif // PRODUCT | |
2982 | |
2983 | |
2984 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
2985 assert(reg_map != NULL, "a map must be given"); | |
2986 frame f = last_frame(); | |
2987 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
2988 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
2989 } | |
2990 return NULL; | |
2991 } | |
2992 | |
2993 | |
2994 klassOop JavaThread::security_get_caller_class(int depth) { | |
2995 vframeStream vfst(this); | |
2996 vfst.security_get_caller_frame(depth); | |
2997 if (!vfst.at_end()) { | |
2998 return vfst.method()->method_holder(); | |
2999 } | |
3000 return NULL; | |
3001 } | |
3002 | |
3003 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
3004 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
3005 CompileBroker::compiler_thread_loop(); | |
3006 } | |
3007 | |
3008 // Create a CompilerThread | |
3009 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
3010 : JavaThread(&compiler_thread_entry) { | |
3011 _env = NULL; | |
3012 _log = NULL; | |
3013 _task = NULL; | |
3014 _queue = queue; | |
3015 _counters = counters; | |
1584 | 3016 _buffer_blob = NULL; |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
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3336
diff
changeset
|
3017 _scanned_nmethod = NULL; |
0 | 3018 |
3019 #ifndef PRODUCT | |
3020 _ideal_graph_printer = NULL; | |
3021 #endif | |
3022 } | |
3023 | |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3024 void CompilerThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3025 JavaThread::oops_do(f, cf); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3026 if (_scanned_nmethod != NULL && cf != NULL) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3027 // 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
|
3028 // 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
|
3029 // a scan. |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3030 cf->do_code_blob(_scanned_nmethod); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3031 } |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
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3336
diff
changeset
|
3032 } |
0 | 3033 |
3034 // ======= Threads ======== | |
3035 | |
3036 // The Threads class links together all active threads, and provides | |
3037 // operations over all threads. It is protected by its own Mutex | |
3038 // lock, which is also used in other contexts to protect thread | |
3039 // operations from having the thread being operated on from exiting | |
3040 // and going away unexpectedly (e.g., safepoint synchronization) | |
3041 | |
3042 JavaThread* Threads::_thread_list = NULL; | |
3043 int Threads::_number_of_threads = 0; | |
3044 int Threads::_number_of_non_daemon_threads = 0; | |
3045 int Threads::_return_code = 0; | |
3046 size_t JavaThread::_stack_size_at_create = 0; | |
3047 | |
3048 // All JavaThreads | |
3049 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
3050 | |
3051 void os_stream(); | |
3052 | |
3053 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
3054 void Threads::threads_do(ThreadClosure* tc) { | |
3055 assert_locked_or_safepoint(Threads_lock); | |
3056 // ALL_JAVA_THREADS iterates through all JavaThreads | |
3057 ALL_JAVA_THREADS(p) { | |
3058 tc->do_thread(p); | |
3059 } | |
3060 // Someday we could have a table or list of all non-JavaThreads. | |
3061 // For now, just manually iterate through them. | |
3062 tc->do_thread(VMThread::vm_thread()); | |
3063 Universe::heap()->gc_threads_do(tc); | |
323
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3064 WatcherThread *wt = WatcherThread::watcher_thread(); |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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286
diff
changeset
|
3065 // 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
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|
3066 // the data for WatcherThread is still valid upon being examined. However, |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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286
diff
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|
3067 // considering that WatchThread terminates when the VM is on the way to |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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286
diff
changeset
|
3068 // 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
|
3069 // way to prevent termination of WatcherThread would be to acquire |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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286
diff
changeset
|
3070 // Terminator_lock, but we can't do that without violating the lock rank |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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286
diff
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|
3071 // checking in some cases. |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
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|
3072 if (wt != NULL) |
b33eef719520
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|
3073 tc->do_thread(wt); |
b33eef719520
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|
3074 |
0 | 3075 // If CompilerThreads ever become non-JavaThreads, add them here |
3076 } | |
3077 | |
3078 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
3079 | |
242 | 3080 extern void JDK_Version_init(); |
3081 | |
0 | 3082 // Check version |
3083 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
3084 | |
3085 // Initialize the output stream module | |
3086 ostream_init(); | |
3087 | |
3088 // Process java launcher properties. | |
3089 Arguments::process_sun_java_launcher_properties(args); | |
3090 | |
3091 // Initialize the os module before using TLS | |
3092 os::init(); | |
3093 | |
3094 // Initialize system properties. | |
3095 Arguments::init_system_properties(); | |
3096 | |
242 | 3097 // So that JDK version can be used as a discrimintor when parsing arguments |
3098 JDK_Version_init(); | |
3099 | |
1864
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3100 // Update/Initialize System properties after JDK version number is known |
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3101 Arguments::init_version_specific_system_properties(); |
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
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1731
diff
changeset
|
3102 |
0 | 3103 // Parse arguments |
3104 jint parse_result = Arguments::parse(args); | |
3105 if (parse_result != JNI_OK) return parse_result; | |
3106 | |
3107 if (PauseAtStartup) { | |
3108 os::pause(); | |
3109 } | |
3110 | |
4006 | 3111 #ifndef USDT2 |
0 | 3112 HS_DTRACE_PROBE(hotspot, vm__init__begin); |
4006 | 3113 #else /* USDT2 */ |
3114 HOTSPOT_VM_INIT_BEGIN(); | |
3115 #endif /* USDT2 */ | |
0 | 3116 |
3117 // Record VM creation timing statistics | |
3118 TraceVmCreationTime create_vm_timer; | |
3119 create_vm_timer.start(); | |
3120 | |
3121 // Timing (must come after argument parsing) | |
3122 TraceTime timer("Create VM", TraceStartupTime); | |
3123 | |
3124 // Initialize the os module after parsing the args | |
3125 jint os_init_2_result = os::init_2(); | |
3126 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
3127 | |
3128 // Initialize output stream logging | |
3129 ostream_init_log(); | |
3130 | |
3131 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
3132 // Must be before create_vm_init_agents() | |
3133 if (Arguments::init_libraries_at_startup()) { | |
3134 convert_vm_init_libraries_to_agents(); | |
3135 } | |
3136 | |
3137 // Launch -agentlib/-agentpath and converted -Xrun agents | |
3138 if (Arguments::init_agents_at_startup()) { | |
3139 create_vm_init_agents(); | |
3140 } | |
3141 | |
3142 // Initialize Threads state | |
3143 _thread_list = NULL; | |
3144 _number_of_threads = 0; | |
3145 _number_of_non_daemon_threads = 0; | |
3146 | |
3147 // Initialize TLS | |
3148 ThreadLocalStorage::init(); | |
3149 | |
3150 // Initialize global data structures and create system classes in heap | |
3151 vm_init_globals(); | |
3152 | |
3153 // Attach the main thread to this os thread | |
3154 JavaThread* main_thread = new JavaThread(); | |
3155 main_thread->set_thread_state(_thread_in_vm); | |
3156 // must do this before set_active_handles and initialize_thread_local_storage | |
3157 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
3158 // change the stack size recorded here to one based on the java thread | |
3159 // stacksize. This adjusted size is what is used to figure the placement | |
3160 // of the guard pages. | |
3161 main_thread->record_stack_base_and_size(); | |
3162 main_thread->initialize_thread_local_storage(); | |
3163 | |
3164 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
3165 | |
3166 if (!main_thread->set_as_starting_thread()) { | |
3167 vm_shutdown_during_initialization( | |
3168 "Failed necessary internal allocation. Out of swap space"); | |
3169 delete main_thread; | |
3170 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3171 return JNI_ENOMEM; | |
3172 } | |
3173 | |
3174 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
3175 // crash Linux VM, see notes in os_linux.cpp. | |
3176 main_thread->create_stack_guard_pages(); | |
3177 | |
1878 | 3178 // Initialize Java-Level synchronization subsystem |
3179 ObjectMonitor::Initialize() ; | |
0 | 3180 |
3181 // Initialize global modules | |
3182 jint status = init_globals(); | |
3183 if (status != JNI_OK) { | |
3184 delete main_thread; | |
3185 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3186 return status; | |
3187 } | |
3188 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3189 // Should be done after the heap is fully created |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3190 main_thread->cache_global_variables(); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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1608
diff
changeset
|
3191 |
0 | 3192 HandleMark hm; |
3193 | |
3194 { MutexLocker mu(Threads_lock); | |
3195 Threads::add(main_thread); | |
3196 } | |
3197 | |
3198 // Any JVMTI raw monitors entered in onload will transition into | |
3199 // real raw monitor. VM is setup enough here for raw monitor enter. | |
3200 JvmtiExport::transition_pending_onload_raw_monitors(); | |
3201 | |
3202 if (VerifyBeforeGC && | |
3203 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
3204 Universe::heap()->prepare_for_verify(); | |
3205 Universe::verify(); // make sure we're starting with a clean slate | |
3206 } | |
3207 | |
3208 // Create the VMThread | |
3209 { TraceTime timer("Start VMThread", TraceStartupTime); | |
3210 VMThread::create(); | |
3211 Thread* vmthread = VMThread::vm_thread(); | |
3212 | |
3213 if (!os::create_thread(vmthread, os::vm_thread)) | |
3214 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
3215 | |
3216 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
3217 // Monitors can have spurious returns, must always check another state flag | |
3218 { | |
3219 MutexLocker ml(Notify_lock); | |
3220 os::start_thread(vmthread); | |
3221 while (vmthread->active_handles() == NULL) { | |
3222 Notify_lock->wait(); | |
3223 } | |
3224 } | |
3225 } | |
3226 | |
3227 assert (Universe::is_fully_initialized(), "not initialized"); | |
3228 EXCEPTION_MARK; | |
3229 | |
3230 // At this point, the Universe is initialized, but we have not executed | |
3231 // any byte code. Now is a good time (the only time) to dump out the | |
3232 // internal state of the JVM for sharing. | |
3233 | |
3234 if (DumpSharedSpaces) { | |
3235 Universe::heap()->preload_and_dump(CHECK_0); | |
3236 ShouldNotReachHere(); | |
3237 } | |
3238 | |
3239 // Always call even when there are not JVMTI environments yet, since environments | |
3240 // may be attached late and JVMTI must track phases of VM execution | |
3241 JvmtiExport::enter_start_phase(); | |
3242 | |
3243 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
3244 JvmtiExport::post_vm_start(); | |
3245 | |
3246 { | |
3247 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
3248 | |
3249 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3250 create_vm_init_libraries(); | |
3251 } | |
3252 | |
3253 if (InitializeJavaLangString) { | |
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3254 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
0 | 3255 } else { |
3256 warning("java.lang.String not initialized"); | |
3257 } | |
3258 | |
18
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3259 if (AggressiveOpts) { |
192
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|
3260 { |
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3261 // Forcibly initialize java/util/HashMap and mutate the private |
6d13fcb3663f
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|
3262 // static final "frontCacheEnabled" field before we start creating instances |
18
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3263 #ifdef ASSERT |
2177
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3264 klassOop tmp_k = SystemDictionary::find(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
192
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3265 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
18
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|
3266 #endif |
2177
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3267 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
192
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3268 KlassHandle k = KlassHandle(THREAD, k_o); |
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3269 guarantee(k.not_null(), "Must find java/util/HashMap"); |
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3270 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
6d13fcb3663f
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3271 ik->initialize(CHECK_0); |
6d13fcb3663f
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|
3272 fieldDescriptor fd; |
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|
3273 // Possible we might not find this field; if so, don't break |
6d13fcb3663f
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3274 if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
2376
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3275 k()->java_mirror()->bool_field_put(fd.offset(), true); |
192
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3276 } |
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diff
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|
3277 } |
6d13fcb3663f
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diff
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|
3278 |
6d13fcb3663f
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changeset
|
3279 if (UseStringCache) { |
669
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changeset
|
3280 // Forcibly initialize java/lang/StringValue and mutate the private |
192
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|
3281 // static final "stringCacheEnabled" field before we start creating instances |
2177
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|
3282 klassOop k_o = SystemDictionary::resolve_or_null(vmSymbols::java_lang_StringValue(), Handle(), Handle(), CHECK_0); |
669
eca19a8425b5
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diff
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|
3283 // 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
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441
diff
changeset
|
3284 if (k_o != NULL) { |
eca19a8425b5
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441
diff
changeset
|
3285 KlassHandle k = KlassHandle(THREAD, k_o); |
eca19a8425b5
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diff
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|
3286 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
eca19a8425b5
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phh
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441
diff
changeset
|
3287 ik->initialize(CHECK_0); |
eca19a8425b5
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parents:
441
diff
changeset
|
3288 fieldDescriptor fd; |
eca19a8425b5
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parents:
441
diff
changeset
|
3289 // Possible we might not find this field: if so, silently don't break |
eca19a8425b5
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parents:
441
diff
changeset
|
3290 if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
2376
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2302
diff
changeset
|
3291 k()->java_mirror()->bool_field_put(fd.offset(), true); |
669
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|
3292 } |
192
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|
3293 } |
18
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diff
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|
3294 } |
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0
diff
changeset
|
3295 } |
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|
3296 |
0 | 3297 // Initialize java_lang.System (needed before creating the thread) |
3298 if (InitializeJavaLangSystem) { | |
2177
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|
3299 initialize_class(vmSymbols::java_lang_System(), CHECK_0); |
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coleenp
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diff
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|
3300 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); |
0 | 3301 Handle thread_group = create_initial_thread_group(CHECK_0); |
3302 Universe::set_main_thread_group(thread_group()); | |
2177
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|
3303 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); |
0 | 3304 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); |
3305 main_thread->set_threadObj(thread_object); | |
3306 // Set thread status to running since main thread has | |
3307 // been started and running. | |
3308 java_lang_Thread::set_thread_status(thread_object, | |
3309 java_lang_Thread::RUNNABLE); | |
3310 | |
3311 // The VM preresolve methods to these classes. Make sure that get initialized | |
2177
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|
3312 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0); |
3582bf76420e
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coleenp
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|
3313 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); |
0 | 3314 // The VM creates & returns objects of this class. Make sure it's initialized. |
2177
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|
3315 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); |
0 | 3316 call_initializeSystemClass(CHECK_0); |
3317 } else { | |
3318 warning("java.lang.System not initialized"); | |
3319 } | |
3320 | |
3321 // an instance of OutOfMemory exception has been allocated earlier | |
3322 if (InitializeJavaLangExceptionsErrors) { | |
2177
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6990754: Use native memory and reference counting to implement SymbolTable
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diff
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|
3323 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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diff
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|
3324 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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diff
changeset
|
3325 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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diff
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|
3326 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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diff
changeset
|
3327 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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diff
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|
3328 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3329 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); |
0 | 3330 } else { |
3331 warning("java.lang.OutOfMemoryError has not been initialized"); | |
3332 warning("java.lang.NullPointerException has not been initialized"); | |
3333 warning("java.lang.ClassCastException has not been initialized"); | |
3334 warning("java.lang.ArrayStoreException has not been initialized"); | |
3335 warning("java.lang.ArithmeticException has not been initialized"); | |
3336 warning("java.lang.StackOverflowError has not been initialized"); | |
3337 } | |
2416
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6817525: turn on method handle functionality by default for JSR 292
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diff
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|
3338 } |
0 | 3339 |
3340 // See : bugid 4211085. | |
3341 // Background : the static initializer of java.lang.Compiler tries to read | |
3342 // property"java.compiler" and read & write property "java.vm.info". | |
3343 // When a security manager is installed through the command line | |
3344 // option "-Djava.security.manager", the above properties are not | |
3345 // readable and the static initializer for java.lang.Compiler fails | |
3346 // resulting in a NoClassDefFoundError. This can happen in any | |
3347 // user code which calls methods in java.lang.Compiler. | |
3348 // Hack : the hack is to pre-load and initialize this class, so that only | |
3349 // system domains are on the stack when the properties are read. | |
3350 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
3351 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
3352 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
3353 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
3354 // Once that is done, we should remove this hack. | |
2177
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coleenp
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|
3355 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
0 | 3356 |
3357 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
3358 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
3359 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
3360 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
3361 // This should also be taken out as soon as 4211383 gets fixed. | |
3362 reset_vm_info_property(CHECK_0); | |
3363 | |
3364 quicken_jni_functions(); | |
3365 | |
3366 // Set flag that basic initialization has completed. Used by exceptions and various | |
3367 // debug stuff, that does not work until all basic classes have been initialized. | |
3368 set_init_completed(); | |
3369 | |
4006 | 3370 #ifndef USDT2 |
0 | 3371 HS_DTRACE_PROBE(hotspot, vm__init__end); |
4006 | 3372 #else /* USDT2 */ |
3373 HOTSPOT_VM_INIT_END(); | |
3374 #endif /* USDT2 */ | |
0 | 3375 |
3376 // record VM initialization completion time | |
3377 Management::record_vm_init_completed(); | |
3378 | |
3379 // Compute system loader. Note that this has to occur after set_init_completed, since | |
3380 // valid exceptions may be thrown in the process. | |
3381 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
3382 // set_init_completed has just been called, causing exceptions not to be shortcut | |
3383 // anymore. We call vm_exit_during_initialization directly instead. | |
3384 SystemDictionary::compute_java_system_loader(THREAD); | |
3385 if (HAS_PENDING_EXCEPTION) { | |
3386 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3387 } | |
3388 | |
3389 #ifndef SERIALGC | |
3390 // 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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|
3391 // and better encapsulated. The ugly nested if test would go away |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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diff
changeset
|
3392 // once things are properly refactored. XXX YSR |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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diff
changeset
|
3393 if (UseConcMarkSweepGC || UseG1GC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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diff
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|
3394 if (UseConcMarkSweepGC) { |
37f87013dfd8
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diff
changeset
|
3395 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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diff
changeset
|
3396 } else { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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diff
changeset
|
3397 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
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|
3398 } |
0 | 3399 if (HAS_PENDING_EXCEPTION) { |
3400 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3401 } | |
3402 } | |
3403 #endif // SERIALGC | |
3404 | |
3405 // Always call even when there are not JVMTI environments yet, since environments | |
3406 // may be attached late and JVMTI must track phases of VM execution | |
3407 JvmtiExport::enter_live_phase(); | |
3408 | |
3409 // Signal Dispatcher needs to be started before VMInit event is posted | |
3410 os::signal_init(); | |
3411 | |
3412 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
3413 if (!DisableAttachMechanism) { | |
3414 if (StartAttachListener || AttachListener::init_at_startup()) { | |
3415 AttachListener::init(); | |
3416 } | |
3417 } | |
3418 | |
3419 // Launch -Xrun agents | |
3420 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
3421 // back-end can launch with -Xdebug -Xrunjdwp. | |
3422 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3423 create_vm_init_libraries(); | |
3424 } | |
3425 | |
3426 // Notify JVMTI agents that VM initialization is complete - nop if no agents. | |
3427 JvmtiExport::post_vm_initialized(); | |
3428 | |
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
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3769
diff
changeset
|
3429 if (CleanChunkPoolAsync) { |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
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3769
diff
changeset
|
3430 Chunk::start_chunk_pool_cleaner_task(); |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
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diff
changeset
|
3431 } |
0 | 3432 |
3433 // initialize compiler(s) | |
3434 CompileBroker::compilation_init(); | |
3435 | |
3436 Management::initialize(THREAD); | |
3437 if (HAS_PENDING_EXCEPTION) { | |
3438 // management agent fails to start possibly due to | |
3439 // configuration problem and is responsible for printing | |
3440 // stack trace if appropriate. Simply exit VM. | |
3441 vm_exit(1); | |
3442 } | |
3443 | |
3444 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
3445 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
3446 if (MemProfiling) MemProfiler::engage(); | |
3447 StatSampler::engage(); | |
3448 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
3449 | |
3450 BiasedLocking::init(); | |
3451 | |
2129
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6994753: Implement optional hook to a Java method at VM startup.
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2126
diff
changeset
|
3452 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
|
3453 call_postVMInitHook(THREAD); |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
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diff
changeset
|
3454 // The Java side of PostVMInitHook.run must deal with all |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
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diff
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|
3455 // exceptions and provide means of diagnosis. |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
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diff
changeset
|
3456 if (HAS_PENDING_EXCEPTION) { |
8f8dfba37802
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diff
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|
3457 CLEAR_PENDING_EXCEPTION; |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
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diff
changeset
|
3458 } |
8f8dfba37802
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|
3459 } |
0 | 3460 |
3461 // Start up the WatcherThread if there are any periodic tasks | |
3462 // NOTE: All PeriodicTasks should be registered by now. If they | |
3463 // aren't, late joiners might appear to start slowly (we might | |
3464 // take a while to process their first tick). | |
3465 if (PeriodicTask::num_tasks() > 0) { | |
3466 WatcherThread::start(); | |
3467 } | |
3468 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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1608
diff
changeset
|
3469 // 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
|
3470 os::init_3(); |
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6953477: Increase portability and flexibility of building Hotspot
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diff
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|
3471 |
0 | 3472 create_vm_timer.end(); |
3473 return JNI_OK; | |
3474 } | |
3475 | |
3476 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
3477 extern "C" { | |
3478 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
3479 } | |
3480 // Find a command line agent library and return its entry point for | |
3481 // -agentlib: -agentpath: -Xrun | |
3482 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
3483 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
3484 OnLoadEntry_t on_load_entry = NULL; | |
3485 void *library = agent->os_lib(); // check if we have looked it up before | |
3486 | |
3487 if (library == NULL) { | |
3488 char buffer[JVM_MAXPATHLEN]; | |
3489 char ebuf[1024]; | |
3490 const char *name = agent->name(); | |
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3491 const char *msg = "Could not find agent library "; |
0 | 3492 |
3493 if (agent->is_absolute_path()) { | |
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3494 library = os::dll_load(name, ebuf, sizeof ebuf); |
0 | 3495 if (library == NULL) { |
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3496 const char *sub_msg = " in absolute path, with error: "; |
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3497 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
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3498 char *buf = NEW_C_HEAP_ARRAY(char, len); |
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3499 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3500 // If we can't find the agent, exit. |
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3501 vm_exit_during_initialization(buf, NULL); |
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3502 FREE_C_HEAP_ARRAY(char, buf); |
0 | 3503 } |
3504 } else { | |
3505 // Try to load the agent from the standard dll directory | |
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3506 os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), name); |
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3507 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3508 #ifdef KERNEL |
3509 // Download instrument dll | |
3510 if (library == NULL && strcmp(name, "instrument") == 0) { | |
3511 char *props = Arguments::get_kernel_properties(); | |
3512 char *home = Arguments::get_java_home(); | |
3513 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
3514 " sun.jkernel.DownloadManager -download client_jvm"; | |
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3515 size_t length = strlen(props) + strlen(home) + strlen(fmt) + 1; |
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3516 char *cmd = NEW_C_HEAP_ARRAY(char, length); |
0 | 3517 jio_snprintf(cmd, length, fmt, home, props); |
3518 int status = os::fork_and_exec(cmd); | |
3519 FreeHeap(props); | |
3520 if (status == -1) { | |
3521 warning(cmd); | |
3522 vm_exit_during_initialization("fork_and_exec failed: %s", | |
3523 strerror(errno)); | |
3524 } | |
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3525 FREE_C_HEAP_ARRAY(char, cmd); |
0 | 3526 // when this comes back the instrument.dll should be where it belongs. |
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3527 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3528 } |
3529 #endif // KERNEL | |
3530 if (library == NULL) { // Try the local directory | |
3531 char ns[1] = {0}; | |
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3532 os::dll_build_name(buffer, sizeof(buffer), ns, name); |
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3533 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3534 if (library == NULL) { |
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3535 const char *sub_msg = " on the library path, with error: "; |
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3536 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
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3537 char *buf = NEW_C_HEAP_ARRAY(char, len); |
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3538 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3539 // If we can't find the agent, exit. |
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3540 vm_exit_during_initialization(buf, NULL); |
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3541 FREE_C_HEAP_ARRAY(char, buf); |
0 | 3542 } |
3543 } | |
3544 } | |
3545 agent->set_os_lib(library); | |
3546 } | |
3547 | |
3548 // Find the OnLoad function. | |
3549 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
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3550 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, os::dll_lookup(library, on_load_symbols[symbol_index])); |
0 | 3551 if (on_load_entry != NULL) break; |
3552 } | |
3553 return on_load_entry; | |
3554 } | |
3555 | |
3556 // Find the JVM_OnLoad entry point | |
3557 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
3558 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
3559 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3560 } | |
3561 | |
3562 // Find the Agent_OnLoad entry point | |
3563 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
3564 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
3565 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3566 } | |
3567 | |
3568 // For backwards compatibility with -Xrun | |
3569 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
3570 // treated like -agentpath: | |
3571 // Must be called before agent libraries are created | |
3572 void Threads::convert_vm_init_libraries_to_agents() { | |
3573 AgentLibrary* agent; | |
3574 AgentLibrary* next; | |
3575 | |
3576 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
3577 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
3578 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3579 | |
3580 // If there is an JVM_OnLoad function it will get called later, | |
3581 // otherwise see if there is an Agent_OnLoad | |
3582 if (on_load_entry == NULL) { | |
3583 on_load_entry = lookup_agent_on_load(agent); | |
3584 if (on_load_entry != NULL) { | |
3585 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
3586 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
3587 Arguments::convert_library_to_agent(agent); | |
3588 } else { | |
3589 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
3590 } | |
3591 } | |
3592 } | |
3593 } | |
3594 | |
3595 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
3596 // Invokes Agent_OnLoad | |
3597 // Called very early -- before JavaThreads exist | |
3598 void Threads::create_vm_init_agents() { | |
3599 extern struct JavaVM_ main_vm; | |
3600 AgentLibrary* agent; | |
3601 | |
3602 JvmtiExport::enter_onload_phase(); | |
3603 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3604 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
3605 | |
3606 if (on_load_entry != NULL) { | |
3607 // Invoke the Agent_OnLoad function | |
3608 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3609 if (err != JNI_OK) { | |
3610 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
3611 } | |
3612 } else { | |
3613 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
3614 } | |
3615 } | |
3616 JvmtiExport::enter_primordial_phase(); | |
3617 } | |
3618 | |
3619 extern "C" { | |
3620 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
3621 } | |
3622 | |
3623 void Threads::shutdown_vm_agents() { | |
3624 // Send any Agent_OnUnload notifications | |
3625 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
3626 extern struct JavaVM_ main_vm; | |
3627 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3628 | |
3629 // Find the Agent_OnUnload function. | |
3630 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
3631 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
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3632 os::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
0 | 3633 |
3634 // Invoke the Agent_OnUnload function | |
3635 if (unload_entry != NULL) { | |
3636 JavaThread* thread = JavaThread::current(); | |
3637 ThreadToNativeFromVM ttn(thread); | |
3638 HandleMark hm(thread); | |
3639 (*unload_entry)(&main_vm); | |
3640 break; | |
3641 } | |
3642 } | |
3643 } | |
3644 } | |
3645 | |
3646 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
3647 // Invokes JVM_OnLoad | |
3648 void Threads::create_vm_init_libraries() { | |
3649 extern struct JavaVM_ main_vm; | |
3650 AgentLibrary* agent; | |
3651 | |
3652 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
3653 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3654 | |
3655 if (on_load_entry != NULL) { | |
3656 // Invoke the JVM_OnLoad function | |
3657 JavaThread* thread = JavaThread::current(); | |
3658 ThreadToNativeFromVM ttn(thread); | |
3659 HandleMark hm(thread); | |
3660 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3661 if (err != JNI_OK) { | |
3662 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
3663 } | |
3664 } else { | |
3665 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
3666 } | |
3667 } | |
3668 } | |
3669 | |
3670 // Last thread running calls java.lang.Shutdown.shutdown() | |
3671 void JavaThread::invoke_shutdown_hooks() { | |
3672 HandleMark hm(this); | |
3673 | |
3674 // We could get here with a pending exception, if so clear it now. | |
3675 if (this->has_pending_exception()) { | |
3676 this->clear_pending_exception(); | |
3677 } | |
3678 | |
3679 EXCEPTION_MARK; | |
3680 klassOop k = | |
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3681 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
0 | 3682 THREAD); |
3683 if (k != NULL) { | |
3684 // SystemDictionary::resolve_or_null will return null if there was | |
3685 // an exception. If we cannot load the Shutdown class, just don't | |
3686 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
3687 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
3688 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
3689 // was called, the Shutdown class would have already been loaded | |
3690 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
3691 instanceKlassHandle shutdown_klass (THREAD, k); | |
3692 JavaValue result(T_VOID); | |
3693 JavaCalls::call_static(&result, | |
3694 shutdown_klass, | |
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3695 vmSymbols::shutdown_method_name(), |
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3696 vmSymbols::void_method_signature(), |
0 | 3697 THREAD); |
3698 } | |
3699 CLEAR_PENDING_EXCEPTION; | |
3700 } | |
3701 | |
3702 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
3703 // the program falls off the end of main(). Another VM exit path is through | |
3704 // vm_exit() when the program calls System.exit() to return a value or when | |
3705 // there is a serious error in VM. The two shutdown paths are not exactly | |
3706 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
3707 // and VM_Exit op at VM level. | |
3708 // | |
3709 // Shutdown sequence: | |
3710 // + Wait until we are the last non-daemon thread to execute | |
3711 // <-- every thing is still working at this moment --> | |
3712 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
3713 // shutdown hooks, run finalizers if finalization-on-exit | |
3714 // + Call before_exit(), prepare for VM exit | |
3715 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
3716 // currently the only user of this mechanism is File.deleteOnExit()) | |
3717 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
3718 // post thread end and vm death events to JVMTI, | |
3719 // stop signal thread | |
3720 // + Call JavaThread::exit(), it will: | |
3721 // > release JNI handle blocks, remove stack guard pages | |
3722 // > remove this thread from Threads list | |
3723 // <-- no more Java code from this thread after this point --> | |
3724 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
3725 // the compiler threads at safepoint | |
3726 // <-- do not use anything that could get blocked by Safepoint --> | |
3727 // + Disable tracing at JNI/JVM barriers | |
3728 // + Set _vm_exited flag for threads that are still running native code | |
3729 // + Delete this thread | |
3730 // + Call exit_globals() | |
3731 // > deletes tty | |
3732 // > deletes PerfMemory resources | |
3733 // + Return to caller | |
3734 | |
3735 bool Threads::destroy_vm() { | |
3736 JavaThread* thread = JavaThread::current(); | |
3737 | |
3738 // Wait until we are the last non-daemon thread to execute | |
3739 { MutexLocker nu(Threads_lock); | |
3740 while (Threads::number_of_non_daemon_threads() > 1 ) | |
3741 // This wait should make safepoint checks, wait without a timeout, | |
3742 // and wait as a suspend-equivalent condition. | |
3743 // | |
3744 // Note: If the FlatProfiler is running and this thread is waiting | |
3745 // for another non-daemon thread to finish, then the FlatProfiler | |
3746 // is waiting for the external suspend request on this thread to | |
3747 // complete. wait_for_ext_suspend_completion() will eventually | |
3748 // timeout, but that takes time. Making this wait a suspend- | |
3749 // equivalent condition solves that timeout problem. | |
3750 // | |
3751 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
3752 Mutex::_as_suspend_equivalent_flag); | |
3753 } | |
3754 | |
3755 // Hang forever on exit if we are reporting an error. | |
3756 if (ShowMessageBoxOnError && is_error_reported()) { | |
3757 os::infinite_sleep(); | |
3758 } | |
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3759 os::wait_for_keypress_at_exit(); |
0 | 3760 |
3761 if (JDK_Version::is_jdk12x_version()) { | |
3762 // We are the last thread running, so check if finalizers should be run. | |
3763 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
3764 HandleMark rm(thread); | |
3765 Universe::run_finalizers_on_exit(); | |
3766 } else { | |
3767 // run Java level shutdown hooks | |
3768 thread->invoke_shutdown_hooks(); | |
3769 } | |
3770 | |
3771 before_exit(thread); | |
3772 | |
3773 thread->exit(true); | |
3774 | |
3775 // Stop VM thread. | |
3776 { | |
3777 // 4945125 The vm thread comes to a safepoint during exit. | |
3778 // GC vm_operations can get caught at the safepoint, and the | |
3779 // heap is unparseable if they are caught. Grab the Heap_lock | |
3780 // to prevent this. The GC vm_operations will not be able to | |
3781 // queue until after the vm thread is dead. | |
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3782 // After this point, we'll never emerge out of the safepoint before |
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3783 // the VM exits, so concurrent GC threads do not need to be explicitly |
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7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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3784 // stopped; they remain inactive until the process exits. |
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3785 // Note: some concurrent G1 threads may be running during a safepoint, |
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7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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3786 // but these will not be accessing the heap, just some G1-specific side |
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3787 // data structures that are not accessed by any other threads but them |
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3788 // after this point in a terminal safepoint. |
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|
3789 |
0 | 3790 MutexLocker ml(Heap_lock); |
3791 | |
3792 VMThread::wait_for_vm_thread_exit(); | |
3793 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
3794 VMThread::destroy(); | |
3795 } | |
3796 | |
3797 // clean up ideal graph printers | |
3798 #if defined(COMPILER2) && !defined(PRODUCT) | |
3799 IdealGraphPrinter::clean_up(); | |
3800 #endif | |
3801 | |
3802 // Now, all Java threads are gone except daemon threads. Daemon threads | |
3803 // running Java code or in VM are stopped by the Safepoint. However, | |
3804 // daemon threads executing native code are still running. But they | |
3805 // will be stopped at native=>Java/VM barriers. Note that we can't | |
3806 // simply kill or suspend them, as it is inherently deadlock-prone. | |
3807 | |
3808 #ifndef PRODUCT | |
3809 // disable function tracing at JNI/JVM barriers | |
3810 TraceJNICalls = false; | |
3811 TraceJVMCalls = false; | |
3812 TraceRuntimeCalls = false; | |
3813 #endif | |
3814 | |
3815 VM_Exit::set_vm_exited(); | |
3816 | |
3817 notify_vm_shutdown(); | |
3818 | |
3819 delete thread; | |
3820 | |
3821 // exit_globals() will delete tty | |
3822 exit_globals(); | |
3823 | |
3824 return true; | |
3825 } | |
3826 | |
3827 | |
3828 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
3829 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
3830 return is_supported_jni_version(version); | |
3831 } | |
3832 | |
3833 | |
3834 jboolean Threads::is_supported_jni_version(jint version) { | |
3835 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
3836 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
3837 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
3838 return JNI_FALSE; | |
3839 } | |
3840 | |
3841 | |
3842 void Threads::add(JavaThread* p, bool force_daemon) { | |
3843 // The threads lock must be owned at this point | |
3844 assert_locked_or_safepoint(Threads_lock); | |
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3845 |
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3846 // See the comment for this method in thread.hpp for its purpose and |
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|
3847 // why it is called here. |
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|
3848 p->initialize_queues(); |
0 | 3849 p->set_next(_thread_list); |
3850 _thread_list = p; | |
3851 _number_of_threads++; | |
3852 oop threadObj = p->threadObj(); | |
3853 bool daemon = true; | |
3854 // Bootstrapping problem: threadObj can be null for initial | |
3855 // JavaThread (or for threads attached via JNI) | |
3856 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
3857 _number_of_non_daemon_threads++; | |
3858 daemon = false; | |
3859 } | |
3860 | |
3861 ThreadService::add_thread(p, daemon); | |
3862 | |
3863 // Possible GC point. | |
3864 Events::log("Thread added: " INTPTR_FORMAT, p); | |
3865 } | |
3866 | |
3867 void Threads::remove(JavaThread* p) { | |
3868 // Extra scope needed for Thread_lock, so we can check | |
3869 // that we do not remove thread without safepoint code notice | |
3870 { MutexLocker ml(Threads_lock); | |
3871 | |
3872 assert(includes(p), "p must be present"); | |
3873 | |
3874 JavaThread* current = _thread_list; | |
3875 JavaThread* prev = NULL; | |
3876 | |
3877 while (current != p) { | |
3878 prev = current; | |
3879 current = current->next(); | |
3880 } | |
3881 | |
3882 if (prev) { | |
3883 prev->set_next(current->next()); | |
3884 } else { | |
3885 _thread_list = p->next(); | |
3886 } | |
3887 _number_of_threads--; | |
3888 oop threadObj = p->threadObj(); | |
3889 bool daemon = true; | |
3890 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
3891 _number_of_non_daemon_threads--; | |
3892 daemon = false; | |
3893 | |
3894 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
3895 // on destroy_vm will wake up. | |
3896 if (number_of_non_daemon_threads() == 1) | |
3897 Threads_lock->notify_all(); | |
3898 } | |
3899 ThreadService::remove_thread(p, daemon); | |
3900 | |
3901 // Make sure that safepoint code disregard this thread. This is needed since | |
3902 // the thread might mess around with locks after this point. This can cause it | |
3903 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
3904 // of this thread since it is removed from the queue. | |
3905 p->set_terminated_value(); | |
3906 } // unlock Threads_lock | |
3907 | |
3908 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
3909 Events::log("Thread exited: " INTPTR_FORMAT, p); | |
3910 } | |
3911 | |
3912 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
3913 bool Threads::includes(JavaThread* p) { | |
3914 assert(Threads_lock->is_locked(), "sanity check"); | |
3915 ALL_JAVA_THREADS(q) { | |
3916 if (q == p ) { | |
3917 return true; | |
3918 } | |
3919 } | |
3920 return false; | |
3921 } | |
3922 | |
3923 // Operations on the Threads list for GC. These are not explicitly locked, | |
3924 // but the garbage collector must provide a safe context for them to run. | |
3925 // In particular, these things should never be called when the Threads_lock | |
3926 // is held by some other thread. (Note: the Safepoint abstraction also | |
3927 // uses the Threads_lock to gurantee this property. It also makes sure that | |
3928 // all threads gets blocked when exiting or starting). | |
3929 | |
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|
3930 void Threads::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 3931 ALL_JAVA_THREADS(p) { |
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3932 p->oops_do(f, cf); |
0 | 3933 } |
989
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3934 VMThread::vm_thread()->oops_do(f, cf); |
0 | 3935 } |
3936 | |
989
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3937 void Threads::possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 3938 // Introduce a mechanism allowing parallel threads to claim threads as |
3939 // root groups. Overhead should be small enough to use all the time, | |
3940 // even in sequential code. | |
3941 SharedHeap* sh = SharedHeap::heap(); | |
4095
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3942 // Cannot yet substitute active_workers for n_par_threads |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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3943 // because of G1CollectedHeap::verify() use of |
bca17e38de00
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jmasa
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|
3944 // SharedHeap::process_strong_roots(). n_par_threads == 0 will |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
changeset
|
3945 // turn off parallelism in process_strong_roots while active_workers |
bca17e38de00
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diff
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|
3946 // is being used for parallelism elsewhere. |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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|
3947 bool is_par = sh->n_par_threads() > 0; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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diff
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|
3948 assert(!is_par || |
bca17e38de00
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|
3949 (SharedHeap::heap()->n_par_threads() == |
bca17e38de00
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|
3950 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
0 | 3951 int cp = SharedHeap::heap()->strong_roots_parity(); |
3952 ALL_JAVA_THREADS(p) { | |
3953 if (p->claim_oops_do(is_par, cp)) { | |
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|
3954 p->oops_do(f, cf); |
0 | 3955 } |
3956 } | |
3957 VMThread* vmt = VMThread::vm_thread(); | |
3979
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6484982: G1: process references during evacuation pauses
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diff
changeset
|
3958 if (vmt->claim_oops_do(is_par, cp)) { |
989
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3959 vmt->oops_do(f, cf); |
3979
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diff
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|
3960 } |
0 | 3961 } |
3962 | |
3963 #ifndef SERIALGC | |
3964 // Used by ParallelScavenge | |
3965 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
3966 ALL_JAVA_THREADS(p) { | |
3967 q->enqueue(new ThreadRootsTask(p)); | |
3968 } | |
3969 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
3970 } | |
3971 | |
3972 // Used by Parallel Old | |
3973 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
3974 ALL_JAVA_THREADS(p) { | |
3975 q->enqueue(new ThreadRootsMarkingTask(p)); | |
3976 } | |
3977 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
3978 } | |
3979 #endif // SERIALGC | |
3980 | |
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|
3981 void Threads::nmethods_do(CodeBlobClosure* cf) { |
0 | 3982 ALL_JAVA_THREADS(p) { |
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diff
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|
3983 p->nmethods_do(cf); |
0 | 3984 } |
989
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diff
changeset
|
3985 VMThread::vm_thread()->nmethods_do(cf); |
0 | 3986 } |
3987 | |
3988 void Threads::gc_epilogue() { | |
3989 ALL_JAVA_THREADS(p) { | |
3990 p->gc_epilogue(); | |
3991 } | |
3992 } | |
3993 | |
3994 void Threads::gc_prologue() { | |
3995 ALL_JAVA_THREADS(p) { | |
3996 p->gc_prologue(); | |
3997 } | |
3998 } | |
3999 | |
4000 void Threads::deoptimized_wrt_marked_nmethods() { | |
4001 ALL_JAVA_THREADS(p) { | |
4002 p->deoptimized_wrt_marked_nmethods(); | |
4003 } | |
4004 } | |
4005 | |
4006 | |
4007 // Get count Java threads that are waiting to enter the specified monitor. | |
4008 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
4009 address monitor, bool doLock) { | |
4010 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
4011 "must grab Threads_lock or be at safepoint"); | |
4012 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
4013 | |
4014 int i = 0; | |
4015 { | |
4016 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4017 ALL_JAVA_THREADS(p) { | |
4018 if (p->is_Compiler_thread()) continue; | |
4019 | |
4020 address pending = (address)p->current_pending_monitor(); | |
4021 if (pending == monitor) { // found a match | |
4022 if (i < count) result->append(p); // save the first count matches | |
4023 i++; | |
4024 } | |
4025 } | |
4026 } | |
4027 return result; | |
4028 } | |
4029 | |
4030 | |
4031 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
4032 assert(doLock || | |
4033 Threads_lock->owned_by_self() || | |
4034 SafepointSynchronize::is_at_safepoint(), | |
4035 "must grab Threads_lock or be at safepoint"); | |
4036 | |
4037 // NULL owner means not locked so we can skip the search | |
4038 if (owner == NULL) return NULL; | |
4039 | |
4040 { | |
4041 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4042 ALL_JAVA_THREADS(p) { | |
4043 // first, see if owner is the address of a Java thread | |
4044 if (owner == (address)p) return p; | |
4045 } | |
4046 } | |
4047 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
4048 if (UseHeavyMonitors) return NULL; | |
4049 | |
4050 // | |
4051 // If we didn't find a matching Java thread and we didn't force use of | |
4052 // heavyweight monitors, then the owner is the stack address of the | |
4053 // Lock Word in the owning Java thread's stack. | |
4054 // | |
4055 JavaThread* the_owner = NULL; | |
4056 { | |
4057 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4058 ALL_JAVA_THREADS(q) { | |
702
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6699669: Hotspot server leaves synchronized block with monitor in bad state
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diff
changeset
|
4059 if (q->is_lock_owned(owner)) { |
0 | 4060 the_owner = q; |
702
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|
4061 break; |
0 | 4062 } |
4063 } | |
4064 } | |
4065 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
4066 return the_owner; | |
4067 } | |
4068 | |
4069 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
4070 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
4071 char buf[32]; | |
4072 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
4073 | |
4074 st->print_cr("Full thread dump %s (%s %s):", | |
4075 Abstract_VM_Version::vm_name(), | |
4076 Abstract_VM_Version::vm_release(), | |
4077 Abstract_VM_Version::vm_info_string() | |
4078 ); | |
4079 st->cr(); | |
4080 | |
4081 #ifndef SERIALGC | |
4082 // Dump concurrent locks | |
4083 ConcurrentLocksDump concurrent_locks; | |
4084 if (print_concurrent_locks) { | |
4085 concurrent_locks.dump_at_safepoint(); | |
4086 } | |
4087 #endif // SERIALGC | |
4088 | |
4089 ALL_JAVA_THREADS(p) { | |
4090 ResourceMark rm; | |
4091 p->print_on(st); | |
4092 if (print_stacks) { | |
4093 if (internal_format) { | |
4094 p->trace_stack(); | |
4095 } else { | |
4096 p->print_stack_on(st); | |
4097 } | |
4098 } | |
4099 st->cr(); | |
4100 #ifndef SERIALGC | |
4101 if (print_concurrent_locks) { | |
4102 concurrent_locks.print_locks_on(p, st); | |
4103 } | |
4104 #endif // SERIALGC | |
4105 } | |
4106 | |
4107 VMThread::vm_thread()->print_on(st); | |
4108 st->cr(); | |
4109 Universe::heap()->print_gc_threads_on(st); | |
4110 WatcherThread* wt = WatcherThread::watcher_thread(); | |
4111 if (wt != NULL) wt->print_on(st); | |
4112 st->cr(); | |
4113 CompileBroker::print_compiler_threads_on(st); | |
4114 st->flush(); | |
4115 } | |
4116 | |
4117 // Threads::print_on_error() is called by fatal error handler. It's possible | |
4118 // that VM is not at safepoint and/or current thread is inside signal handler. | |
4119 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
4120 // memory (even in resource area), it might deadlock the error handler. | |
4121 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
4122 bool found_current = false; | |
4123 st->print_cr("Java Threads: ( => current thread )"); | |
4124 ALL_JAVA_THREADS(thread) { | |
4125 bool is_current = (current == thread); | |
4126 found_current = found_current || is_current; | |
4127 | |
4128 st->print("%s", is_current ? "=>" : " "); | |
4129 | |
4130 st->print(PTR_FORMAT, thread); | |
4131 st->print(" "); | |
4132 thread->print_on_error(st, buf, buflen); | |
4133 st->cr(); | |
4134 } | |
4135 st->cr(); | |
4136 | |
4137 st->print_cr("Other Threads:"); | |
4138 if (VMThread::vm_thread()) { | |
4139 bool is_current = (current == VMThread::vm_thread()); | |
4140 found_current = found_current || is_current; | |
4141 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
4142 | |
4143 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
4144 st->print(" "); | |
4145 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
4146 st->cr(); | |
4147 } | |
4148 WatcherThread* wt = WatcherThread::watcher_thread(); | |
4149 if (wt != NULL) { | |
4150 bool is_current = (current == wt); | |
4151 found_current = found_current || is_current; | |
4152 st->print("%s", is_current ? "=>" : " "); | |
4153 | |
4154 st->print(PTR_FORMAT, wt); | |
4155 st->print(" "); | |
4156 wt->print_on_error(st, buf, buflen); | |
4157 st->cr(); | |
4158 } | |
4159 if (!found_current) { | |
4160 st->cr(); | |
4161 st->print("=>" PTR_FORMAT " (exited) ", current); | |
4162 current->print_on_error(st, buf, buflen); | |
4163 st->cr(); | |
4164 } | |
4165 } | |
4166 | |
1878 | 4167 // Internal SpinLock and Mutex |
4168 // Based on ParkEvent | |
4169 | |
4170 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
0 | 4171 // |
1878 | 4172 // We employ SpinLocks _only for low-contention, fixed-length |
4173 // short-duration critical sections where we're concerned | |
4174 // about native mutex_t or HotSpot Mutex:: latency. | |
4175 // The mux construct provides a spin-then-block mutual exclusion | |
4176 // mechanism. | |
4177 // | |
4178 // Testing has shown that contention on the ListLock guarding gFreeList | |
4179 // is common. If we implement ListLock as a simple SpinLock it's common | |
4180 // for the JVM to devolve to yielding with little progress. This is true | |
4181 // despite the fact that the critical sections protected by ListLock are | |
4182 // extremely short. | |
0 | 4183 // |
1878 | 4184 // TODO-FIXME: ListLock should be of type SpinLock. |
4185 // We should make this a 1st-class type, integrated into the lock | |
4186 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
4187 // should have sufficient padding to avoid false-sharing and excessive | |
4188 // cache-coherency traffic. | |
4189 | |
4190 | |
4191 typedef volatile int SpinLockT ; | |
4192 | |
4193 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
4194 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
4195 return ; // normal fast-path return | |
4196 } | |
4197 | |
4198 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
4199 TEVENT (SpinAcquire - ctx) ; | |
4200 int ctr = 0 ; | |
4201 int Yields = 0 ; | |
0 | 4202 for (;;) { |
1878 | 4203 while (*adr != 0) { |
4204 ++ctr ; | |
4205 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
4206 if (Yields > 5) { | |
4207 // Consider using a simple NakedSleep() instead. | |
4208 // Then SpinAcquire could be called by non-JVM threads | |
4209 Thread::current()->_ParkEvent->park(1) ; | |
4210 } else { | |
4211 os::NakedYield() ; | |
4212 ++Yields ; | |
4213 } | |
4214 } else { | |
4215 SpinPause() ; | |
0 | 4216 } |
1878 | 4217 } |
4218 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
0 | 4219 } |
4220 } | |
4221 | |
1878 | 4222 void Thread::SpinRelease (volatile int * adr) { |
4223 assert (*adr != 0, "invariant") ; | |
4224 OrderAccess::fence() ; // guarantee at least release consistency. | |
4225 // Roach-motel semantics. | |
4226 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
4227 // but prior LDs and STs within the critical section can't be allowed | |
4228 // to reorder or float past the ST that releases the lock. | |
4229 *adr = 0 ; | |
0 | 4230 } |
4231 | |
1878 | 4232 // muxAcquire and muxRelease: |
4233 // | |
4234 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
4235 // The LSB of the word is set IFF the lock is held. | |
4236 // The remainder of the word points to the head of a singly-linked list | |
4237 // of threads blocked on the lock. | |
4238 // | |
4239 // * The current implementation of muxAcquire-muxRelease uses its own | |
4240 // dedicated Thread._MuxEvent instance. If we're interested in | |
4241 // minimizing the peak number of extant ParkEvent instances then | |
4242 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
4243 // as certain invariants were satisfied. Specifically, care would need | |
4244 // to be taken with regards to consuming unpark() "permits". | |
4245 // A safe rule of thumb is that a thread would never call muxAcquire() | |
4246 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
4247 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
4248 // consume an unpark() permit intended for monitorenter, for instance. | |
4249 // One way around this would be to widen the restricted-range semaphore | |
4250 // implemented in park(). Another alternative would be to provide | |
4251 // multiple instances of the PlatformEvent() for each thread. One | |
4252 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
4253 // | |
4254 // * Usage: | |
4255 // -- Only as leaf locks | |
4256 // -- for short-term locking only as muxAcquire does not perform | |
4257 // thread state transitions. | |
4258 // | |
4259 // Alternatives: | |
4260 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
4261 // but with parking or spin-then-park instead of pure spinning. | |
4262 // * Use Taura-Oyama-Yonenzawa locks. | |
4263 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
4264 // (List,LockByte). Acquire will CAS the full lockword while Release | |
4265 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
4266 // acquiring threads use timers (ParkTimed) to detect and recover from | |
4267 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
4268 // boundaries by using placement-new. | |
4269 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
4270 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
4271 // The validity of the backlinks must be ratified before we trust the value. | |
4272 // If the backlinks are invalid the exiting thread must back-track through the | |
4273 // the forward links, which are always trustworthy. | |
4274 // * Add a successor indication. The LockWord is currently encoded as | |
4275 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
4276 // to provide the usual futile-wakeup optimization. | |
4277 // See RTStt for details. | |
4278 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
4279 // | |
4280 | |
4281 | |
4282 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
4283 enum MuxBits { LOCKBIT = 1 } ; | |
4284 | |
4285 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
4286 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4287 if (w == 0) return ; | |
4288 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4289 return ; | |
4290 } | |
4291 | |
4292 TEVENT (muxAcquire - Contention) ; | |
4293 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
4294 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
0 | 4295 for (;;) { |
1878 | 4296 int its = (os::is_MP() ? 100 : 0) + 1 ; |
4297 | |
4298 // Optional spin phase: spin-then-park strategy | |
4299 while (--its >= 0) { | |
4300 w = *Lock ; | |
4301 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4302 return ; | |
4303 } | |
4304 } | |
4305 | |
4306 Self->reset() ; | |
4307 Self->OnList = intptr_t(Lock) ; | |
4308 // The following fence() isn't _strictly necessary as the subsequent | |
4309 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4310 OrderAccess::fence(); | |
4311 for (;;) { | |
4312 w = *Lock ; | |
4313 if ((w & LOCKBIT) == 0) { | |
4314 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4315 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
4316 return ; | |
4317 } | |
4318 continue ; // Interference -- *Lock changed -- Just retry | |
0 | 4319 } |
1878 | 4320 assert (w & LOCKBIT, "invariant") ; |
4321 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4322 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
4323 } | |
4324 | |
4325 while (Self->OnList != 0) { | |
4326 Self->park() ; | |
4327 } | |
0 | 4328 } |
4329 } | |
4330 | |
1878 | 4331 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
4332 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4333 if (w == 0) return ; | |
4334 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4335 return ; | |
4336 } | |
4337 | |
4338 TEVENT (muxAcquire - Contention) ; | |
4339 ParkEvent * ReleaseAfter = NULL ; | |
4340 if (ev == NULL) { | |
4341 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
4342 } | |
4343 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
4344 for (;;) { | |
4345 guarantee (ev->OnList == 0, "invariant") ; | |
4346 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
4347 | |
4348 // Optional spin phase: spin-then-park strategy | |
4349 while (--its >= 0) { | |
4350 w = *Lock ; | |
4351 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4352 if (ReleaseAfter != NULL) { | |
4353 ParkEvent::Release (ReleaseAfter) ; | |
4354 } | |
4355 return ; | |
4356 } | |
4357 } | |
4358 | |
4359 ev->reset() ; | |
4360 ev->OnList = intptr_t(Lock) ; | |
4361 // The following fence() isn't _strictly necessary as the subsequent | |
4362 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4363 OrderAccess::fence(); | |
4364 for (;;) { | |
4365 w = *Lock ; | |
4366 if ((w & LOCKBIT) == 0) { | |
4367 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4368 ev->OnList = 0 ; | |
4369 // We call ::Release while holding the outer lock, thus | |
4370 // artificially lengthening the critical section. | |
4371 // Consider deferring the ::Release() until the subsequent unlock(), | |
4372 // after we've dropped the outer lock. | |
4373 if (ReleaseAfter != NULL) { | |
4374 ParkEvent::Release (ReleaseAfter) ; | |
4375 } | |
4376 return ; | |
4377 } | |
4378 continue ; // Interference -- *Lock changed -- Just retry | |
4379 } | |
4380 assert (w & LOCKBIT, "invariant") ; | |
4381 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4382 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
4383 } | |
4384 | |
4385 while (ev->OnList != 0) { | |
4386 ev->park() ; | |
4387 } | |
4388 } | |
4389 } | |
4390 | |
4391 // Release() must extract a successor from the list and then wake that thread. | |
4392 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
4393 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
4394 // Release() would : | |
4395 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
4396 // (B) Extract a successor from the private list "in-hand" | |
4397 // (C) attempt to CAS() the residual back into *Lock over null. | |
4398 // If there were any newly arrived threads and the CAS() would fail. | |
4399 // In that case Release() would detach the RATs, re-merge the list in-hand | |
4400 // with the RATs and repeat as needed. Alternately, Release() might | |
4401 // detach and extract a successor, but then pass the residual list to the wakee. | |
4402 // The wakee would be responsible for reattaching and remerging before it | |
4403 // competed for the lock. | |
4404 // | |
4405 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
4406 // multiple concurrent pushers, but only one popper or detacher. | |
4407 // This implementation pops from the head of the list. This is unfair, | |
4408 // but tends to provide excellent throughput as hot threads remain hot. | |
4409 // (We wake recently run threads first). | |
4410 | |
4411 void Thread::muxRelease (volatile intptr_t * Lock) { | |
4412 for (;;) { | |
4413 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
4414 assert (w & LOCKBIT, "invariant") ; | |
4415 if (w == LOCKBIT) return ; | |
4416 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
4417 assert (List != NULL, "invariant") ; | |
4418 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
4419 ParkEvent * nxt = List->ListNext ; | |
4420 | |
4421 // The following CAS() releases the lock and pops the head element. | |
4422 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
4423 continue ; | |
4424 } | |
4425 List->OnList = 0 ; | |
4426 OrderAccess::fence() ; | |
4427 List->unpark () ; | |
4428 return ; | |
4429 } | |
4430 } | |
4431 | |
4432 | |
0 | 4433 void Threads::verify() { |
4434 ALL_JAVA_THREADS(p) { | |
4435 p->verify(); | |
4436 } | |
4437 VMThread* thread = VMThread::vm_thread(); | |
4438 if (thread != NULL) thread->verify(); | |
4439 } |