Mercurial > hg > graal-jvmci-8
annotate src/share/vm/runtime/thread.cpp @ 6766:a7509aff1b06
7194254: jstack reports wrong thread priorities
Reviewed-by: dholmes, sla, fparain
Contributed-by: Dmytro Sheyko <dmytro_sheyko@hotmail.com>
author | dholmes |
---|---|
date | Mon, 17 Sep 2012 07:36:31 -0400 |
parents | 6dfc6a541338 |
children | c088e2e95e69 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/classLoader.hpp" | |
27 #include "classfile/javaClasses.hpp" | |
28 #include "classfile/systemDictionary.hpp" | |
29 #include "classfile/vmSymbols.hpp" | |
30 #include "code/scopeDesc.hpp" | |
31 #include "compiler/compileBroker.hpp" | |
32 #include "interpreter/interpreter.hpp" | |
33 #include "interpreter/linkResolver.hpp" | |
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34 #include "interpreter/oopMapCache.hpp" |
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35 #include "jvmtifiles/jvmtiEnv.hpp" |
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36 #include "memory/gcLocker.inline.hpp" |
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37 #include "memory/metaspaceShared.hpp" |
1972 | 38 #include "memory/oopFactory.hpp" |
39 #include "memory/universe.inline.hpp" | |
40 #include "oops/instanceKlass.hpp" | |
41 #include "oops/objArrayOop.hpp" | |
42 #include "oops/oop.inline.hpp" | |
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43 #include "oops/symbol.hpp" |
1972 | 44 #include "prims/jvm_misc.hpp" |
45 #include "prims/jvmtiExport.hpp" | |
46 #include "prims/jvmtiThreadState.hpp" | |
47 #include "prims/privilegedStack.hpp" | |
48 #include "runtime/aprofiler.hpp" | |
49 #include "runtime/arguments.hpp" | |
50 #include "runtime/biasedLocking.hpp" | |
51 #include "runtime/deoptimization.hpp" | |
52 #include "runtime/fprofiler.hpp" | |
53 #include "runtime/frame.inline.hpp" | |
54 #include "runtime/init.hpp" | |
55 #include "runtime/interfaceSupport.hpp" | |
56 #include "runtime/java.hpp" | |
57 #include "runtime/javaCalls.hpp" | |
58 #include "runtime/jniPeriodicChecker.hpp" | |
59 #include "runtime/memprofiler.hpp" | |
60 #include "runtime/mutexLocker.hpp" | |
61 #include "runtime/objectMonitor.hpp" | |
62 #include "runtime/osThread.hpp" | |
63 #include "runtime/safepoint.hpp" | |
64 #include "runtime/sharedRuntime.hpp" | |
65 #include "runtime/statSampler.hpp" | |
66 #include "runtime/stubRoutines.hpp" | |
67 #include "runtime/task.hpp" | |
68 #include "runtime/threadCritical.hpp" | |
69 #include "runtime/threadLocalStorage.hpp" | |
70 #include "runtime/vframe.hpp" | |
71 #include "runtime/vframeArray.hpp" | |
72 #include "runtime/vframe_hp.hpp" | |
73 #include "runtime/vmThread.hpp" | |
74 #include "runtime/vm_operations.hpp" | |
75 #include "services/attachListener.hpp" | |
76 #include "services/management.hpp" | |
6197 | 77 #include "services/memTracker.hpp" |
1972 | 78 #include "services/threadService.hpp" |
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79 #include "trace/traceEventTypes.hpp" |
1972 | 80 #include "utilities/defaultStream.hpp" |
81 #include "utilities/dtrace.hpp" | |
82 #include "utilities/events.hpp" | |
83 #include "utilities/preserveException.hpp" | |
84 #ifdef TARGET_OS_FAMILY_linux | |
85 # include "os_linux.inline.hpp" | |
86 # include "thread_linux.inline.hpp" | |
87 #endif | |
88 #ifdef TARGET_OS_FAMILY_solaris | |
89 # include "os_solaris.inline.hpp" | |
90 # include "thread_solaris.inline.hpp" | |
91 #endif | |
92 #ifdef TARGET_OS_FAMILY_windows | |
93 # include "os_windows.inline.hpp" | |
94 # include "thread_windows.inline.hpp" | |
95 #endif | |
3960 | 96 #ifdef TARGET_OS_FAMILY_bsd |
97 # include "os_bsd.inline.hpp" | |
98 # include "thread_bsd.inline.hpp" | |
99 #endif | |
1972 | 100 #ifndef SERIALGC |
101 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
102 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
103 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
104 #endif | |
105 #ifdef COMPILER1 | |
106 #include "c1/c1_Compiler.hpp" | |
107 #endif | |
108 #ifdef COMPILER2 | |
109 #include "opto/c2compiler.hpp" | |
110 #include "opto/idealGraphPrinter.hpp" | |
111 #endif | |
0 | 112 |
113 #ifdef DTRACE_ENABLED | |
114 | |
115 // Only bother with this argument setup if dtrace is available | |
116 | |
4006 | 117 #ifndef USDT2 |
0 | 118 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); |
119 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
120 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
121 intptr_t, intptr_t, bool); | |
122 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
123 intptr_t, intptr_t, bool); | |
124 | |
125 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
126 { \ | |
127 ResourceMark rm(this); \ | |
128 int len = 0; \ | |
129 const char* name = (javathread)->get_thread_name(); \ | |
130 len = strlen(name); \ | |
131 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
132 name, len, \ | |
133 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
134 (javathread)->osthread()->thread_id(), \ | |
135 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
136 } | |
137 | |
4006 | 138 #else /* USDT2 */ |
139 | |
140 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_PROBE_START | |
141 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_PROBE_STOP | |
142 | |
143 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
144 { \ | |
145 ResourceMark rm(this); \ | |
146 int len = 0; \ | |
147 const char* name = (javathread)->get_thread_name(); \ | |
148 len = strlen(name); \ | |
149 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \ | |
150 (char *) name, len, \ | |
151 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
152 (uintptr_t) (javathread)->osthread()->thread_id(), \ | |
153 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
154 } | |
155 | |
156 #endif /* USDT2 */ | |
157 | |
0 | 158 #else // ndef DTRACE_ENABLED |
159 | |
160 #define DTRACE_THREAD_PROBE(probe, javathread) | |
161 | |
162 #endif // ndef DTRACE_ENABLED | |
163 | |
6197 | 164 |
0 | 165 // Class hierarchy |
166 // - Thread | |
167 // - VMThread | |
168 // - WatcherThread | |
169 // - ConcurrentMarkSweepThread | |
170 // - JavaThread | |
171 // - CompilerThread | |
172 | |
173 // ======= Thread ======== | |
174 // Support for forcing alignment of thread objects for biased locking | |
6197 | 175 void* Thread::allocate(size_t size, bool throw_excpt, MEMFLAGS flags) { |
0 | 176 if (UseBiasedLocking) { |
177 const int alignment = markOopDesc::biased_lock_alignment; | |
178 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
6197 | 179 void* real_malloc_addr = throw_excpt? AllocateHeap(aligned_size, flags, CURRENT_PC) |
180 : os::malloc(aligned_size, flags, CURRENT_PC); | |
0 | 181 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); |
182 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
183 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
184 "JavaThread alignment code overflowed allocated storage"); | |
185 if (TraceBiasedLocking) { | |
186 if (aligned_addr != real_malloc_addr) | |
187 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
188 real_malloc_addr, aligned_addr); | |
189 } | |
190 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
191 return aligned_addr; | |
192 } else { | |
6197 | 193 return throw_excpt? AllocateHeap(size, flags, CURRENT_PC) |
194 : os::malloc(size, flags, CURRENT_PC); | |
0 | 195 } |
196 } | |
197 | |
198 void Thread::operator delete(void* p) { | |
199 if (UseBiasedLocking) { | |
200 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
6197 | 201 FreeHeap(real_malloc_addr, mtThread); |
0 | 202 } else { |
6197 | 203 FreeHeap(p, mtThread); |
0 | 204 } |
205 } | |
206 | |
207 | |
208 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
209 // JavaThread | |
210 | |
211 | |
212 Thread::Thread() { | |
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213 // stack and get_thread |
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214 set_stack_base(NULL); |
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215 set_stack_size(0); |
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216 set_self_raw_id(0); |
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217 set_lgrp_id(-1); |
0 | 218 |
219 // allocated data structures | |
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220 set_osthread(NULL); |
6197 | 221 set_resource_area(new (mtThread)ResourceArea()); |
222 set_handle_area(new (mtThread) HandleArea(NULL)); | |
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223 set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(300, true)); |
0 | 224 set_active_handles(NULL); |
225 set_free_handle_block(NULL); | |
226 set_last_handle_mark(NULL); | |
227 | |
228 // This initial value ==> never claimed. | |
229 _oops_do_parity = 0; | |
230 | |
231 // the handle mark links itself to last_handle_mark | |
232 new HandleMark(this); | |
233 | |
234 // plain initialization | |
235 debug_only(_owned_locks = NULL;) | |
236 debug_only(_allow_allocation_count = 0;) | |
237 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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238 NOT_PRODUCT(_skip_gcalot = false;) |
0 | 239 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
240 _jvmti_env_iteration_count = 0; | |
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241 set_allocated_bytes(0); |
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242 set_trace_buffer(NULL); |
0 | 243 _vm_operation_started_count = 0; |
244 _vm_operation_completed_count = 0; | |
245 _current_pending_monitor = NULL; | |
246 _current_pending_monitor_is_from_java = true; | |
247 _current_waiting_monitor = NULL; | |
248 _num_nested_signal = 0; | |
249 omFreeList = NULL ; | |
250 omFreeCount = 0 ; | |
251 omFreeProvision = 32 ; | |
1587 | 252 omInUseList = NULL ; |
253 omInUseCount = 0 ; | |
0 | 254 |
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255 #ifdef ASSERT |
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256 _visited_for_critical_count = false; |
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257 #endif |
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258 |
0 | 259 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); |
260 _suspend_flags = 0; | |
261 | |
262 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
263 _hashStateX = os::random() ; | |
264 _hashStateY = 842502087 ; | |
265 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
266 _hashStateW = 273326509 ; | |
267 | |
268 _OnTrap = 0 ; | |
269 _schedctl = NULL ; | |
270 _Stalled = 0 ; | |
271 _TypeTag = 0x2BAD ; | |
272 | |
273 // Many of the following fields are effectively final - immutable | |
274 // Note that nascent threads can't use the Native Monitor-Mutex | |
275 // construct until the _MutexEvent is initialized ... | |
276 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
277 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
278 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
279 // and ::Release() | |
280 _ParkEvent = ParkEvent::Allocate (this) ; | |
281 _SleepEvent = ParkEvent::Allocate (this) ; | |
282 _MutexEvent = ParkEvent::Allocate (this) ; | |
283 _MuxEvent = ParkEvent::Allocate (this) ; | |
284 | |
285 #ifdef CHECK_UNHANDLED_OOPS | |
286 if (CheckUnhandledOops) { | |
287 _unhandled_oops = new UnhandledOops(this); | |
288 } | |
289 #endif // CHECK_UNHANDLED_OOPS | |
290 #ifdef ASSERT | |
291 if (UseBiasedLocking) { | |
292 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
293 assert(this == _real_malloc_address || | |
294 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
295 "bug in forced alignment of thread objects"); | |
296 } | |
297 #endif /* ASSERT */ | |
298 } | |
299 | |
300 void Thread::initialize_thread_local_storage() { | |
301 // Note: Make sure this method only calls | |
302 // non-blocking operations. Otherwise, it might not work | |
303 // with the thread-startup/safepoint interaction. | |
304 | |
305 // During Java thread startup, safepoint code should allow this | |
306 // method to complete because it may need to allocate memory to | |
307 // store information for the new thread. | |
308 | |
309 // initialize structure dependent on thread local storage | |
310 ThreadLocalStorage::set_thread(this); | |
311 | |
312 // set up any platform-specific state. | |
313 os::initialize_thread(); | |
314 } | |
315 | |
316 void Thread::record_stack_base_and_size() { | |
317 set_stack_base(os::current_stack_base()); | |
318 set_stack_size(os::current_stack_size()); | |
6197 | 319 |
320 // record thread's native stack, stack grows downward | |
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321 address low_stack_addr = stack_base() - stack_size(); |
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322 MemTracker::record_thread_stack(low_stack_addr, stack_size(), this, |
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323 CURRENT_PC); |
0 | 324 } |
325 | |
326 | |
327 Thread::~Thread() { | |
328 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
329 ObjectSynchronizer::omFlush (this) ; | |
330 | |
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331 // stack_base can be NULL if the thread is never started or exited before |
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332 // record_stack_base_and_size called. Although, we would like to ensure |
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333 // that all started threads do call record_stack_base_and_size(), there is |
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334 // not proper way to enforce that. |
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335 if (_stack_base != NULL) { |
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336 address low_stack_addr = stack_base() - stack_size(); |
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337 MemTracker::release_thread_stack(low_stack_addr, stack_size(), this); |
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338 } |
6197 | 339 |
0 | 340 // deallocate data structures |
341 delete resource_area(); | |
342 // since the handle marks are using the handle area, we have to deallocated the root | |
343 // handle mark before deallocating the thread's handle area, | |
344 assert(last_handle_mark() != NULL, "check we have an element"); | |
345 delete last_handle_mark(); | |
346 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
347 | |
348 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
349 // We NULL out the fields for good hygiene. | |
350 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
351 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
352 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
353 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
354 | |
355 delete handle_area(); | |
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356 delete metadata_handles(); |
0 | 357 |
358 // osthread() can be NULL, if creation of thread failed. | |
359 if (osthread() != NULL) os::free_thread(osthread()); | |
360 | |
361 delete _SR_lock; | |
362 | |
363 // clear thread local storage if the Thread is deleting itself | |
364 if (this == Thread::current()) { | |
365 ThreadLocalStorage::set_thread(NULL); | |
366 } else { | |
367 // In the case where we're not the current thread, invalidate all the | |
368 // caches in case some code tries to get the current thread or the | |
369 // thread that was destroyed, and gets stale information. | |
370 ThreadLocalStorage::invalidate_all(); | |
371 } | |
372 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
373 } | |
374 | |
375 // NOTE: dummy function for assertion purpose. | |
376 void Thread::run() { | |
377 ShouldNotReachHere(); | |
378 } | |
379 | |
380 #ifdef ASSERT | |
381 // Private method to check for dangling thread pointer | |
382 void check_for_dangling_thread_pointer(Thread *thread) { | |
383 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
384 "possibility of dangling Thread pointer"); | |
385 } | |
386 #endif | |
387 | |
388 | |
389 #ifndef PRODUCT | |
390 // Tracing method for basic thread operations | |
391 void Thread::trace(const char* msg, const Thread* const thread) { | |
392 if (!TraceThreadEvents) return; | |
393 ResourceMark rm; | |
394 ThreadCritical tc; | |
395 const char *name = "non-Java thread"; | |
396 int prio = -1; | |
397 if (thread->is_Java_thread() | |
398 && !thread->is_Compiler_thread()) { | |
399 // The Threads_lock must be held to get information about | |
400 // this thread but may not be in some situations when | |
401 // tracing thread events. | |
402 bool release_Threads_lock = false; | |
403 if (!Threads_lock->owned_by_self()) { | |
404 Threads_lock->lock(); | |
405 release_Threads_lock = true; | |
406 } | |
407 JavaThread* jt = (JavaThread *)thread; | |
408 name = (char *)jt->get_thread_name(); | |
409 oop thread_oop = jt->threadObj(); | |
410 if (thread_oop != NULL) { | |
411 prio = java_lang_Thread::priority(thread_oop); | |
412 } | |
413 if (release_Threads_lock) { | |
414 Threads_lock->unlock(); | |
415 } | |
416 } | |
417 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
418 } | |
419 #endif | |
420 | |
421 | |
422 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
423 trace("get priority", thread); | |
424 ThreadPriority priority; | |
425 // Can return an error! | |
426 (void)os::get_priority(thread, priority); | |
427 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
428 return priority; | |
429 } | |
430 | |
431 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
432 trace("set priority", thread); | |
433 debug_only(check_for_dangling_thread_pointer(thread);) | |
434 // Can return an error! | |
435 (void)os::set_priority(thread, priority); | |
436 } | |
437 | |
438 | |
439 void Thread::start(Thread* thread) { | |
440 trace("start", thread); | |
441 // Start is different from resume in that its safety is guaranteed by context or | |
442 // being called from a Java method synchronized on the Thread object. | |
443 if (!DisableStartThread) { | |
444 if (thread->is_Java_thread()) { | |
445 // Initialize the thread state to RUNNABLE before starting this thread. | |
446 // Can not set it after the thread started because we do not know the | |
447 // exact thread state at that time. It could be in MONITOR_WAIT or | |
448 // in SLEEPING or some other state. | |
449 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
450 java_lang_Thread::RUNNABLE); | |
451 } | |
452 os::start_thread(thread); | |
453 } | |
454 } | |
455 | |
456 // Enqueue a VM_Operation to do the job for us - sometime later | |
457 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
458 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
459 VMThread::execute(vm_stop); | |
460 } | |
461 | |
462 | |
463 // | |
464 // Check if an external suspend request has completed (or has been | |
465 // cancelled). Returns true if the thread is externally suspended and | |
466 // false otherwise. | |
467 // | |
468 // The bits parameter returns information about the code path through | |
469 // the routine. Useful for debugging: | |
470 // | |
471 // set in is_ext_suspend_completed(): | |
472 // 0x00000001 - routine was entered | |
473 // 0x00000010 - routine return false at end | |
474 // 0x00000100 - thread exited (return false) | |
475 // 0x00000200 - suspend request cancelled (return false) | |
476 // 0x00000400 - thread suspended (return true) | |
477 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
478 // 0x00002000 - thread is native and walkable (return true) | |
479 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
480 // | |
481 // set in wait_for_ext_suspend_completion(): | |
482 // 0x00010000 - routine was entered | |
483 // 0x00020000 - suspend request cancelled before loop (return false) | |
484 // 0x00040000 - thread suspended before loop (return true) | |
485 // 0x00080000 - suspend request cancelled in loop (return false) | |
486 // 0x00100000 - thread suspended in loop (return true) | |
487 // 0x00200000 - suspend not completed during retry loop (return false) | |
488 // | |
489 | |
490 // Helper class for tracing suspend wait debug bits. | |
491 // | |
492 // 0x00000100 indicates that the target thread exited before it could | |
493 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
494 // 0x00080000 each indicate a cancelled suspend request so they don't | |
495 // count as wait failures either. | |
496 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
497 | |
498 class TraceSuspendDebugBits : public StackObj { | |
499 private: | |
500 JavaThread * jt; | |
501 bool is_wait; | |
502 bool called_by_wait; // meaningful when !is_wait | |
503 uint32_t * bits; | |
504 | |
505 public: | |
506 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
507 uint32_t *_bits) { | |
508 jt = _jt; | |
509 is_wait = _is_wait; | |
510 called_by_wait = _called_by_wait; | |
511 bits = _bits; | |
512 } | |
513 | |
514 ~TraceSuspendDebugBits() { | |
515 if (!is_wait) { | |
516 #if 1 | |
517 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
518 // That trace is very chatty. | |
519 return; | |
520 #else | |
521 if (!called_by_wait) { | |
522 // If tracing for is_ext_suspend_completed() is enabled, then only | |
523 // trace calls to it from wait_for_ext_suspend_completion() | |
524 return; | |
525 } | |
526 #endif | |
527 } | |
528 | |
529 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
530 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
531 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
532 ResourceMark rm; | |
533 | |
534 tty->print_cr( | |
535 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
536 jt->get_thread_name(), *bits); | |
537 | |
538 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
539 } | |
540 } | |
541 } | |
542 }; | |
543 #undef DEBUG_FALSE_BITS | |
544 | |
545 | |
546 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
547 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
548 | |
549 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
550 bool do_trans_retry; // flag to force the retry | |
551 | |
552 *bits |= 0x00000001; | |
553 | |
554 do { | |
555 do_trans_retry = false; | |
556 | |
557 if (is_exiting()) { | |
558 // Thread is in the process of exiting. This is always checked | |
559 // first to reduce the risk of dereferencing a freed JavaThread. | |
560 *bits |= 0x00000100; | |
561 return false; | |
562 } | |
563 | |
564 if (!is_external_suspend()) { | |
565 // Suspend request is cancelled. This is always checked before | |
566 // is_ext_suspended() to reduce the risk of a rogue resume | |
567 // confusing the thread that made the suspend request. | |
568 *bits |= 0x00000200; | |
569 return false; | |
570 } | |
571 | |
572 if (is_ext_suspended()) { | |
573 // thread is suspended | |
574 *bits |= 0x00000400; | |
575 return true; | |
576 } | |
577 | |
578 // Now that we no longer do hard suspends of threads running | |
579 // native code, the target thread can be changing thread state | |
580 // while we are in this routine: | |
581 // | |
582 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
583 // | |
584 // We save a copy of the thread state as observed at this moment | |
585 // and make our decision about suspend completeness based on the | |
586 // copy. This closes the race where the thread state is seen as | |
587 // _thread_in_native_trans in the if-thread_blocked check, but is | |
588 // seen as _thread_blocked in if-thread_in_native_trans check. | |
589 JavaThreadState save_state = thread_state(); | |
590 | |
591 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
592 // If the thread's state is _thread_blocked and this blocking | |
593 // condition is known to be equivalent to a suspend, then we can | |
594 // consider the thread to be externally suspended. This means that | |
595 // the code that sets _thread_blocked has been modified to do | |
596 // self-suspension if the blocking condition releases. We also | |
597 // used to check for CONDVAR_WAIT here, but that is now covered by | |
598 // the _thread_blocked with self-suspension check. | |
599 // | |
600 // Return true since we wouldn't be here unless there was still an | |
601 // external suspend request. | |
602 *bits |= 0x00001000; | |
603 return true; | |
604 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
605 // Threads running native code will self-suspend on native==>VM/Java | |
606 // transitions. If its stack is walkable (should always be the case | |
607 // unless this function is called before the actual java_suspend() | |
608 // call), then the wait is done. | |
609 *bits |= 0x00002000; | |
610 return true; | |
611 } else if (!called_by_wait && !did_trans_retry && | |
612 save_state == _thread_in_native_trans && | |
613 frame_anchor()->walkable()) { | |
614 // The thread is transitioning from thread_in_native to another | |
615 // thread state. check_safepoint_and_suspend_for_native_trans() | |
616 // will force the thread to self-suspend. If it hasn't gotten | |
617 // there yet we may have caught the thread in-between the native | |
618 // code check above and the self-suspend. Lucky us. If we were | |
619 // called by wait_for_ext_suspend_completion(), then it | |
620 // will be doing the retries so we don't have to. | |
621 // | |
622 // Since we use the saved thread state in the if-statement above, | |
623 // there is a chance that the thread has already transitioned to | |
624 // _thread_blocked by the time we get here. In that case, we will | |
625 // make a single unnecessary pass through the logic below. This | |
626 // doesn't hurt anything since we still do the trans retry. | |
627 | |
628 *bits |= 0x00004000; | |
629 | |
630 // Once the thread leaves thread_in_native_trans for another | |
631 // thread state, we break out of this retry loop. We shouldn't | |
632 // need this flag to prevent us from getting back here, but | |
633 // sometimes paranoia is good. | |
634 did_trans_retry = true; | |
635 | |
636 // We wait for the thread to transition to a more usable state. | |
637 for (int i = 1; i <= SuspendRetryCount; i++) { | |
638 // We used to do an "os::yield_all(i)" call here with the intention | |
639 // that yielding would increase on each retry. However, the parameter | |
640 // is ignored on Linux which means the yield didn't scale up. Waiting | |
641 // on the SR_lock below provides a much more predictable scale up for | |
642 // the delay. It also provides a simple/direct point to check for any | |
643 // safepoint requests from the VMThread | |
644 | |
645 // temporarily drops SR_lock while doing wait with safepoint check | |
646 // (if we're a JavaThread - the WatcherThread can also call this) | |
647 // and increase delay with each retry | |
648 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
649 | |
650 // check the actual thread state instead of what we saved above | |
651 if (thread_state() != _thread_in_native_trans) { | |
652 // the thread has transitioned to another thread state so | |
653 // try all the checks (except this one) one more time. | |
654 do_trans_retry = true; | |
655 break; | |
656 } | |
657 } // end retry loop | |
658 | |
659 | |
660 } | |
661 } while (do_trans_retry); | |
662 | |
663 *bits |= 0x00000010; | |
664 return false; | |
665 } | |
666 | |
667 // | |
668 // Wait for an external suspend request to complete (or be cancelled). | |
669 // Returns true if the thread is externally suspended and false otherwise. | |
670 // | |
671 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
672 uint32_t *bits) { | |
673 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
674 false /* !called_by_wait */, bits); | |
675 | |
676 // local flag copies to minimize SR_lock hold time | |
677 bool is_suspended; | |
678 bool pending; | |
679 uint32_t reset_bits; | |
680 | |
681 // set a marker so is_ext_suspend_completed() knows we are the caller | |
682 *bits |= 0x00010000; | |
683 | |
684 // We use reset_bits to reinitialize the bits value at the top of | |
685 // each retry loop. This allows the caller to make use of any | |
686 // unused bits for their own marking purposes. | |
687 reset_bits = *bits; | |
688 | |
689 { | |
690 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
691 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
692 delay, bits); | |
693 pending = is_external_suspend(); | |
694 } | |
695 // must release SR_lock to allow suspension to complete | |
696 | |
697 if (!pending) { | |
698 // A cancelled suspend request is the only false return from | |
699 // is_ext_suspend_completed() that keeps us from entering the | |
700 // retry loop. | |
701 *bits |= 0x00020000; | |
702 return false; | |
703 } | |
704 | |
705 if (is_suspended) { | |
706 *bits |= 0x00040000; | |
707 return true; | |
708 } | |
709 | |
710 for (int i = 1; i <= retries; i++) { | |
711 *bits = reset_bits; // reinit to only track last retry | |
712 | |
713 // We used to do an "os::yield_all(i)" call here with the intention | |
714 // that yielding would increase on each retry. However, the parameter | |
715 // is ignored on Linux which means the yield didn't scale up. Waiting | |
716 // on the SR_lock below provides a much more predictable scale up for | |
717 // the delay. It also provides a simple/direct point to check for any | |
718 // safepoint requests from the VMThread | |
719 | |
720 { | |
721 MutexLocker ml(SR_lock()); | |
722 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
723 // can also call this) and increase delay with each retry | |
724 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
725 | |
726 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
727 delay, bits); | |
728 | |
729 // It is possible for the external suspend request to be cancelled | |
730 // (by a resume) before the actual suspend operation is completed. | |
731 // Refresh our local copy to see if we still need to wait. | |
732 pending = is_external_suspend(); | |
733 } | |
734 | |
735 if (!pending) { | |
736 // A cancelled suspend request is the only false return from | |
737 // is_ext_suspend_completed() that keeps us from staying in the | |
738 // retry loop. | |
739 *bits |= 0x00080000; | |
740 return false; | |
741 } | |
742 | |
743 if (is_suspended) { | |
744 *bits |= 0x00100000; | |
745 return true; | |
746 } | |
747 } // end retry loop | |
748 | |
749 // thread did not suspend after all our retries | |
750 *bits |= 0x00200000; | |
751 return false; | |
752 } | |
753 | |
754 #ifndef PRODUCT | |
755 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
756 | |
757 // This should not need to be atomic as the only way for simultaneous | |
758 // updates is via interrupts. Even then this should be rare or non-existant | |
759 // and we don't care that much anyway. | |
760 | |
761 int index = _jmp_ring_index; | |
762 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
763 _jmp_ring[index]._target = (intptr_t) target; | |
764 _jmp_ring[index]._instruction = (intptr_t) instr; | |
765 _jmp_ring[index]._file = file; | |
766 _jmp_ring[index]._line = line; | |
767 } | |
768 #endif /* PRODUCT */ | |
769 | |
770 // Called by flat profiler | |
771 // Callers have already called wait_for_ext_suspend_completion | |
772 // The assertion for that is currently too complex to put here: | |
773 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
774 bool gotframe = false; | |
775 // self suspension saves needed state. | |
776 if (has_last_Java_frame() && _anchor.walkable()) { | |
777 *_fr = pd_last_frame(); | |
778 gotframe = true; | |
779 } | |
780 return gotframe; | |
781 } | |
782 | |
783 void Thread::interrupt(Thread* thread) { | |
784 trace("interrupt", thread); | |
785 debug_only(check_for_dangling_thread_pointer(thread);) | |
786 os::interrupt(thread); | |
787 } | |
788 | |
789 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
790 trace("is_interrupted", thread); | |
791 debug_only(check_for_dangling_thread_pointer(thread);) | |
792 // Note: If clear_interrupted==false, this simply fetches and | |
793 // returns the value of the field osthread()->interrupted(). | |
794 return os::is_interrupted(thread, clear_interrupted); | |
795 } | |
796 | |
797 | |
798 // GC Support | |
799 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
800 jint thread_parity = _oops_do_parity; | |
801 if (thread_parity != strong_roots_parity) { | |
802 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
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803 if (res == thread_parity) { |
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804 return true; |
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805 } else { |
0 | 806 guarantee(res == strong_roots_parity, "Or else what?"); |
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807 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
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808 "Should only fail when parallel."); |
0 | 809 return false; |
810 } | |
811 } | |
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812 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
0 | 813 "Should only fail when parallel."); |
814 return false; | |
815 } | |
816 | |
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817 void Thread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 818 active_handles()->oops_do(f); |
819 // Do oop for ThreadShadow | |
820 f->do_oop((oop*)&_pending_exception); | |
821 handle_area()->oops_do(f); | |
822 } | |
823 | |
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824 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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825 // no nmethods in a generic thread... |
0 | 826 } |
827 | |
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828 void Thread::metadata_do(void f(Metadata*)) { |
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829 if (metadata_handles() != NULL) { |
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830 for (int i = 0; i< metadata_handles()->length(); i++) { |
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831 f(metadata_handles()->at(i)); |
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832 } |
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833 } |
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834 } |
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835 |
0 | 836 void Thread::print_on(outputStream* st) const { |
837 // get_priority assumes osthread initialized | |
838 if (osthread() != NULL) { | |
6766 | 839 int os_prio; |
840 if (os::get_native_priority(this, &os_prio) == OS_OK) { | |
841 st->print("os_prio=%d ", os_prio); | |
842 } | |
843 st->print("tid=" INTPTR_FORMAT " ", this); | |
0 | 844 osthread()->print_on(st); |
845 } | |
846 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
847 } | |
848 | |
849 // Thread::print_on_error() is called by fatal error handler. Don't use | |
850 // any lock or allocate memory. | |
851 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
852 if (is_VM_thread()) st->print("VMThread"); | |
853 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
854 else if (is_Java_thread()) st->print("JavaThread"); | |
855 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
856 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
857 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
858 else st->print("Thread"); | |
859 | |
860 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
861 _stack_base - _stack_size, _stack_base); | |
862 | |
863 if (osthread()) { | |
864 st->print(" [id=%d]", osthread()->thread_id()); | |
865 } | |
866 } | |
867 | |
868 #ifdef ASSERT | |
869 void Thread::print_owned_locks_on(outputStream* st) const { | |
870 Monitor *cur = _owned_locks; | |
871 if (cur == NULL) { | |
872 st->print(" (no locks) "); | |
873 } else { | |
874 st->print_cr(" Locks owned:"); | |
875 while(cur) { | |
876 cur->print_on(st); | |
877 cur = cur->next(); | |
878 } | |
879 } | |
880 } | |
881 | |
882 static int ref_use_count = 0; | |
883 | |
884 bool Thread::owns_locks_but_compiled_lock() const { | |
885 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
886 if (cur != Compile_lock) return true; | |
887 } | |
888 return false; | |
889 } | |
890 | |
891 | |
892 #endif | |
893 | |
894 #ifndef PRODUCT | |
895 | |
896 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
897 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
898 // no threads which allow_vm_block's are held | |
899 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
900 // Check if current thread is allowed to block at a safepoint | |
901 if (!(_allow_safepoint_count == 0)) | |
902 fatal("Possible safepoint reached by thread that does not allow it"); | |
903 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
904 fatal("LEAF method calling lock?"); | |
905 } | |
906 | |
907 #ifdef ASSERT | |
908 if (potential_vm_operation && is_Java_thread() | |
909 && !Universe::is_bootstrapping()) { | |
910 // Make sure we do not hold any locks that the VM thread also uses. | |
911 // This could potentially lead to deadlocks | |
912 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
913 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
914 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
915 // since it is used to transfer control between JavaThreads and the VMThread | |
916 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
917 if ( (cur->allow_vm_block() && | |
918 cur != Threads_lock && | |
919 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
920 cur != VMOperationRequest_lock && | |
921 cur != VMOperationQueue_lock) || | |
922 cur->rank() == Mutex::special) { | |
923 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
924 } | |
925 } | |
926 } | |
927 | |
928 if (GCALotAtAllSafepoints) { | |
929 // We could enter a safepoint here and thus have a gc | |
930 InterfaceSupport::check_gc_alot(); | |
931 } | |
932 #endif | |
933 } | |
934 #endif | |
935 | |
936 bool Thread::is_in_stack(address adr) const { | |
937 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
938 address end = os::current_stack_pointer(); | |
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939 // Allow non Java threads to call this without stack_base |
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940 if (_stack_base == NULL) return true; |
0 | 941 if (stack_base() >= adr && adr >= end) return true; |
942 | |
943 return false; | |
944 } | |
945 | |
946 | |
947 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
948 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
949 // used for compilation in the future. If that change is made, the need for these methods | |
950 // should be revisited, and they should be removed if possible. | |
951 | |
952 bool Thread::is_lock_owned(address adr) const { | |
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953 return on_local_stack(adr); |
0 | 954 } |
955 | |
956 bool Thread::set_as_starting_thread() { | |
957 // NOTE: this must be called inside the main thread. | |
958 return os::create_main_thread((JavaThread*)this); | |
959 } | |
960 | |
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961 static void initialize_class(Symbol* class_name, TRAPS) { |
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962 Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
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963 InstanceKlass::cast(klass)->initialize(CHECK); |
0 | 964 } |
965 | |
966 | |
967 // Creates the initial ThreadGroup | |
968 static Handle create_initial_thread_group(TRAPS) { | |
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969 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
0 | 970 instanceKlassHandle klass (THREAD, k); |
971 | |
972 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
973 { | |
974 JavaValue result(T_VOID); | |
975 JavaCalls::call_special(&result, | |
976 system_instance, | |
977 klass, | |
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978 vmSymbols::object_initializer_name(), |
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979 vmSymbols::void_method_signature(), |
0 | 980 CHECK_NH); |
981 } | |
982 Universe::set_system_thread_group(system_instance()); | |
983 | |
984 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
985 { | |
986 JavaValue result(T_VOID); | |
987 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
988 JavaCalls::call_special(&result, | |
989 main_instance, | |
990 klass, | |
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991 vmSymbols::object_initializer_name(), |
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992 vmSymbols::threadgroup_string_void_signature(), |
0 | 993 system_instance, |
994 string, | |
995 CHECK_NH); | |
996 } | |
997 return main_instance; | |
998 } | |
999 | |
1000 // Creates the initial Thread | |
1001 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
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1002 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
0 | 1003 instanceKlassHandle klass (THREAD, k); |
1004 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
1005 | |
1006 java_lang_Thread::set_thread(thread_oop(), thread); | |
1007 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1008 thread->set_threadObj(thread_oop()); | |
1009 | |
1010 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
1011 | |
1012 JavaValue result(T_VOID); | |
1013 JavaCalls::call_special(&result, thread_oop, | |
1014 klass, | |
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1015 vmSymbols::object_initializer_name(), |
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1016 vmSymbols::threadgroup_string_void_signature(), |
0 | 1017 thread_group, |
1018 string, | |
1019 CHECK_NULL); | |
1020 return thread_oop(); | |
1021 } | |
1022 | |
1023 static void call_initializeSystemClass(TRAPS) { | |
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1024 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 1025 instanceKlassHandle klass (THREAD, k); |
1026 | |
1027 JavaValue result(T_VOID); | |
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1028 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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1029 vmSymbols::void_method_signature(), CHECK); |
0 | 1030 } |
1031 | |
6181 | 1032 char java_runtime_name[128] = ""; |
1033 | |
1034 // extract the JRE name from sun.misc.Version.java_runtime_name | |
1035 static const char* get_java_runtime_name(TRAPS) { | |
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1036 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
6181 | 1037 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
1038 fieldDescriptor fd; | |
1039 bool found = k != NULL && | |
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1040 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_name_name(), |
6181 | 1041 vmSymbols::string_signature(), &fd); |
1042 if (found) { | |
1043 oop name_oop = k->java_mirror()->obj_field(fd.offset()); | |
1044 if (name_oop == NULL) | |
1045 return NULL; | |
1046 const char* name = java_lang_String::as_utf8_string(name_oop, | |
1047 java_runtime_name, | |
1048 sizeof(java_runtime_name)); | |
1049 return name; | |
1050 } else { | |
1051 return NULL; | |
1052 } | |
1053 } | |
1054 | |
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1055 // General purpose hook into Java code, run once when the VM is initialized. |
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1056 // The Java library method itself may be changed independently from the VM. |
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1057 static void call_postVMInitHook(TRAPS) { |
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1058 Klass* k = SystemDictionary::PostVMInitHook_klass(); |
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1059 instanceKlassHandle klass (THREAD, k); |
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1060 if (klass.not_null()) { |
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1061 JavaValue result(T_VOID); |
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1062 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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1063 vmSymbols::void_method_signature(), |
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1064 CHECK); |
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1065 } |
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1066 } |
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1067 |
0 | 1068 static void reset_vm_info_property(TRAPS) { |
1069 // the vm info string | |
1070 ResourceMark rm(THREAD); | |
1071 const char *vm_info = VM_Version::vm_info_string(); | |
1072 | |
1073 // java.lang.System class | |
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1074 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 1075 instanceKlassHandle klass (THREAD, k); |
1076 | |
1077 // setProperty arguments | |
1078 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
1079 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
1080 | |
1081 // return value | |
1082 JavaValue r(T_OBJECT); | |
1083 | |
1084 // public static String setProperty(String key, String value); | |
1085 JavaCalls::call_static(&r, | |
1086 klass, | |
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1087 vmSymbols::setProperty_name(), |
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1088 vmSymbols::string_string_string_signature(), |
0 | 1089 key_str, |
1090 value_str, | |
1091 CHECK); | |
1092 } | |
1093 | |
1094 | |
1095 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
1096 assert(thread_group.not_null(), "thread group should be specified"); | |
1097 assert(threadObj() == NULL, "should only create Java thread object once"); | |
1098 | |
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1099 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
0 | 1100 instanceKlassHandle klass (THREAD, k); |
1101 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
1102 | |
1103 java_lang_Thread::set_thread(thread_oop(), this); | |
1104 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1105 set_threadObj(thread_oop()); | |
1106 | |
1107 JavaValue result(T_VOID); | |
1108 if (thread_name != NULL) { | |
1109 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
1110 // Thread gets assigned specified name and null target | |
1111 JavaCalls::call_special(&result, | |
1112 thread_oop, | |
1113 klass, | |
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1114 vmSymbols::object_initializer_name(), |
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1115 vmSymbols::threadgroup_string_void_signature(), |
0 | 1116 thread_group, // Argument 1 |
1117 name, // Argument 2 | |
1118 THREAD); | |
1119 } else { | |
1120 // Thread gets assigned name "Thread-nnn" and null target | |
1121 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
1122 JavaCalls::call_special(&result, | |
1123 thread_oop, | |
1124 klass, | |
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1125 vmSymbols::object_initializer_name(), |
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1126 vmSymbols::threadgroup_runnable_void_signature(), |
0 | 1127 thread_group, // Argument 1 |
1128 Handle(), // Argument 2 | |
1129 THREAD); | |
1130 } | |
1131 | |
1132 | |
1133 if (daemon) { | |
1134 java_lang_Thread::set_daemon(thread_oop()); | |
1135 } | |
1136 | |
1137 if (HAS_PENDING_EXCEPTION) { | |
1138 return; | |
1139 } | |
1140 | |
1142 | 1141 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
0 | 1142 Handle threadObj(this, this->threadObj()); |
1143 | |
1144 JavaCalls::call_special(&result, | |
1145 thread_group, | |
1146 group, | |
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1147 vmSymbols::add_method_name(), |
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1148 vmSymbols::thread_void_signature(), |
0 | 1149 threadObj, // Arg 1 |
1150 THREAD); | |
1151 | |
1152 | |
1153 } | |
1154 | |
1155 // NamedThread -- non-JavaThread subclasses with multiple | |
1156 // uniquely named instances should derive from this. | |
1157 NamedThread::NamedThread() : Thread() { | |
1158 _name = NULL; | |
1119
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1159 _processed_thread = NULL; |
0 | 1160 } |
1161 | |
1162 NamedThread::~NamedThread() { | |
1163 if (_name != NULL) { | |
6197 | 1164 FREE_C_HEAP_ARRAY(char, _name, mtThread); |
0 | 1165 _name = NULL; |
1166 } | |
1167 } | |
1168 | |
1169 void NamedThread::set_name(const char* format, ...) { | |
1170 guarantee(_name == NULL, "Only get to set name once."); | |
6197 | 1171 _name = NEW_C_HEAP_ARRAY(char, max_name_len, mtThread); |
0 | 1172 guarantee(_name != NULL, "alloc failure"); |
1173 va_list ap; | |
1174 va_start(ap, format); | |
1175 jio_vsnprintf(_name, max_name_len, format, ap); | |
1176 va_end(ap); | |
1177 } | |
1178 | |
1179 // ======= WatcherThread ======== | |
1180 | |
1181 // The watcher thread exists to simulate timer interrupts. It should | |
1182 // be replaced by an abstraction over whatever native support for | |
1183 // timer interrupts exists on the platform. | |
1184 | |
1185 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
1681
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1186 volatile bool WatcherThread::_should_terminate = false; |
0 | 1187 |
1188 WatcherThread::WatcherThread() : Thread() { | |
1189 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
1190 if (os::create_thread(this, os::watcher_thread)) { | |
1191 _watcher_thread = this; | |
1192 | |
1193 // Set the watcher thread to the highest OS priority which should not be | |
1194 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
1195 // is created. The only normal thread using this priority is the reference | |
1196 // handler thread, which runs for very short intervals only. | |
1197 // If the VMThread's priority is not lower than the WatcherThread profiling | |
1198 // will be inaccurate. | |
1199 os::set_priority(this, MaxPriority); | |
1200 if (!DisableStartThread) { | |
1201 os::start_thread(this); | |
1202 } | |
1203 } | |
1204 } | |
1205 | |
1206 void WatcherThread::run() { | |
1207 assert(this == watcher_thread(), "just checking"); | |
1208 | |
1209 this->record_stack_base_and_size(); | |
1210 this->initialize_thread_local_storage(); | |
1211 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1212 while(!_should_terminate) { | |
1213 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
1214 assert(watcher_thread() == this, "thread consistency check"); | |
1215 | |
1216 // Calculate how long it'll be until the next PeriodicTask work | |
1217 // should be done, and sleep that amount of time. | |
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1218 size_t time_to_wait = PeriodicTask::time_to_wait(); |
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1219 |
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1220 // we expect this to timeout - we only ever get unparked when |
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1221 // we should terminate |
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1222 { |
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1223 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1224 |
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1225 jlong prev_time = os::javaTimeNanos(); |
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1226 for (;;) { |
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1227 int res= _SleepEvent->park(time_to_wait); |
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1228 if (res == OS_TIMEOUT || _should_terminate) |
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1229 break; |
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1230 // spurious wakeup of some kind |
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1231 jlong now = os::javaTimeNanos(); |
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1232 time_to_wait -= (now - prev_time) / 1000000; |
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1233 if (time_to_wait <= 0) |
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1234 break; |
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1235 prev_time = now; |
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1236 } |
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1237 } |
0 | 1238 |
1239 if (is_error_reported()) { | |
1240 // A fatal error has happened, the error handler(VMError::report_and_die) | |
1241 // should abort JVM after creating an error log file. However in some | |
1242 // rare cases, the error handler itself might deadlock. Here we try to | |
1243 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
1244 // | |
1245 // This code is in WatcherThread because WatcherThread wakes up | |
1246 // periodically so the fatal error handler doesn't need to do anything; | |
1247 // also because the WatcherThread is less likely to crash than other | |
1248 // threads. | |
1249 | |
1250 for (;;) { | |
1251 if (!ShowMessageBoxOnError | |
1252 && (OnError == NULL || OnError[0] == '\0') | |
1253 && Arguments::abort_hook() == NULL) { | |
1254 os::sleep(this, 2 * 60 * 1000, false); | |
1255 fdStream err(defaultStream::output_fd()); | |
1256 err.print_raw_cr("# [ timer expired, abort... ]"); | |
1257 // skip atexit/vm_exit/vm_abort hooks | |
1258 os::die(); | |
1259 } | |
1260 | |
1261 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
1262 // ShowMessageBoxOnError when it is ready to abort. | |
1263 os::sleep(this, 5 * 1000, false); | |
1264 } | |
1265 } | |
1266 | |
1267 PeriodicTask::real_time_tick(time_to_wait); | |
1268 | |
1269 // If we have no more tasks left due to dynamic disenrollment, | |
1270 // shut down the thread since we don't currently support dynamic enrollment | |
1271 if (PeriodicTask::num_tasks() == 0) { | |
1272 _should_terminate = true; | |
1273 } | |
1274 } | |
1275 | |
1276 // Signal that it is terminated | |
1277 { | |
1278 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
1279 _watcher_thread = NULL; | |
1280 Terminator_lock->notify(); | |
1281 } | |
1282 | |
1283 // Thread destructor usually does this.. | |
1284 ThreadLocalStorage::set_thread(NULL); | |
1285 } | |
1286 | |
1287 void WatcherThread::start() { | |
1288 if (watcher_thread() == NULL) { | |
1289 _should_terminate = false; | |
1290 // Create the single instance of WatcherThread | |
1291 new WatcherThread(); | |
1292 } | |
1293 } | |
1294 | |
1295 void WatcherThread::stop() { | |
1296 // it is ok to take late safepoints here, if needed | |
1297 MutexLocker mu(Terminator_lock); | |
1298 _should_terminate = true; | |
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1299 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1300 |
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1301 Thread* watcher = watcher_thread(); |
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1302 if (watcher != NULL) |
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1303 watcher->_SleepEvent->unpark(); |
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1304 |
0 | 1305 while(watcher_thread() != NULL) { |
1306 // This wait should make safepoint checks, wait without a timeout, | |
1307 // and wait as a suspend-equivalent condition. | |
1308 // | |
1309 // Note: If the FlatProfiler is running, then this thread is waiting | |
1310 // for the WatcherThread to terminate and the WatcherThread, via the | |
1311 // FlatProfiler task, is waiting for the external suspend request on | |
1312 // this thread to complete. wait_for_ext_suspend_completion() will | |
1313 // eventually timeout, but that takes time. Making this wait a | |
1314 // suspend-equivalent condition solves that timeout problem. | |
1315 // | |
1316 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
1317 Mutex::_as_suspend_equivalent_flag); | |
1318 } | |
1319 } | |
1320 | |
1321 void WatcherThread::print_on(outputStream* st) const { | |
1322 st->print("\"%s\" ", name()); | |
1323 Thread::print_on(st); | |
1324 st->cr(); | |
1325 } | |
1326 | |
1327 // ======= JavaThread ======== | |
1328 | |
1329 // A JavaThread is a normal Java thread | |
1330 | |
1331 void JavaThread::initialize() { | |
1332 // Initialize fields | |
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1333 |
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1334 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1335 set_claimed_par_id(-1); |
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1336 |
0 | 1337 set_saved_exception_pc(NULL); |
1338 set_threadObj(NULL); | |
1339 _anchor.clear(); | |
1340 set_entry_point(NULL); | |
1341 set_jni_functions(jni_functions()); | |
1342 set_callee_target(NULL); | |
1343 set_vm_result(NULL); | |
1344 set_vm_result_2(NULL); | |
1345 set_vframe_array_head(NULL); | |
1346 set_vframe_array_last(NULL); | |
1347 set_deferred_locals(NULL); | |
1348 set_deopt_mark(NULL); | |
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1349 set_deopt_nmethod(NULL); |
0 | 1350 clear_must_deopt_id(); |
1351 set_monitor_chunks(NULL); | |
1352 set_next(NULL); | |
1353 set_thread_state(_thread_new); | |
6197 | 1354 set_recorder(NULL); |
0 | 1355 _terminated = _not_terminated; |
1356 _privileged_stack_top = NULL; | |
1357 _array_for_gc = NULL; | |
1358 _suspend_equivalent = false; | |
1359 _in_deopt_handler = 0; | |
1360 _doing_unsafe_access = false; | |
1361 _stack_guard_state = stack_guard_unused; | |
1362 _exception_oop = NULL; | |
1363 _exception_pc = 0; | |
1364 _exception_handler_pc = 0; | |
1903 | 1365 _is_method_handle_return = 0; |
0 | 1366 _jvmti_thread_state= NULL; |
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1367 _should_post_on_exceptions_flag = JNI_FALSE; |
0 | 1368 _jvmti_get_loaded_classes_closure = NULL; |
1369 _interp_only_mode = 0; | |
1370 _special_runtime_exit_condition = _no_async_condition; | |
1371 _pending_async_exception = NULL; | |
1372 _is_compiling = false; | |
1373 _thread_stat = NULL; | |
1374 _thread_stat = new ThreadStatistics(); | |
1375 _blocked_on_compilation = false; | |
1376 _jni_active_critical = 0; | |
1377 _do_not_unlock_if_synchronized = false; | |
1378 _cached_monitor_info = NULL; | |
1379 _parker = Parker::Allocate(this) ; | |
1380 | |
1381 #ifndef PRODUCT | |
1382 _jmp_ring_index = 0; | |
1383 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
1384 record_jump(NULL, NULL, NULL, 0); | |
1385 } | |
1386 #endif /* PRODUCT */ | |
1387 | |
1388 set_thread_profiler(NULL); | |
1389 if (FlatProfiler::is_active()) { | |
1390 // This is where we would decide to either give each thread it's own profiler | |
1391 // or use one global one from FlatProfiler, | |
1392 // or up to some count of the number of profiled threads, etc. | |
1393 ThreadProfiler* pp = new ThreadProfiler(); | |
1394 pp->engage(); | |
1395 set_thread_profiler(pp); | |
1396 } | |
1397 | |
1398 // Setup safepoint state info for this thread | |
1399 ThreadSafepointState::create(this); | |
1400 | |
1401 debug_only(_java_call_counter = 0); | |
1402 | |
1403 // JVMTI PopFrame support | |
1404 _popframe_condition = popframe_inactive; | |
1405 _popframe_preserved_args = NULL; | |
1406 _popframe_preserved_args_size = 0; | |
1407 | |
1408 pd_initialize(); | |
1409 } | |
1410 | |
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1411 #ifndef SERIALGC |
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1412 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1413 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1414 #endif // !SERIALGC |
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1415 |
4006 | 1416 JavaThread::JavaThread(bool is_attaching_via_jni) : |
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1417 Thread() |
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1418 #ifndef SERIALGC |
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1419 , _satb_mark_queue(&_satb_mark_queue_set), |
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1420 _dirty_card_queue(&_dirty_card_queue_set) |
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1421 #endif // !SERIALGC |
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1422 { |
0 | 1423 initialize(); |
4006 | 1424 if (is_attaching_via_jni) { |
1425 _jni_attach_state = _attaching_via_jni; | |
1426 } else { | |
1427 _jni_attach_state = _not_attaching_via_jni; | |
1428 } | |
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1429 assert(_deferred_card_mark.is_empty(), "Default MemRegion ctor"); |
6197 | 1430 _safepoint_visible = false; |
0 | 1431 } |
1432 | |
1433 bool JavaThread::reguard_stack(address cur_sp) { | |
1434 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
1435 return true; // Stack already guarded or guard pages not needed. | |
1436 } | |
1437 | |
1438 if (register_stack_overflow()) { | |
1439 // For those architectures which have separate register and | |
1440 // memory stacks, we must check the register stack to see if | |
1441 // it has overflowed. | |
1442 return false; | |
1443 } | |
1444 | |
1445 // Java code never executes within the yellow zone: the latter is only | |
1446 // there to provoke an exception during stack banging. If java code | |
1447 // is executing there, either StackShadowPages should be larger, or | |
1448 // some exception code in c1, c2 or the interpreter isn't unwinding | |
1449 // when it should. | |
1450 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
1451 | |
1452 enable_stack_yellow_zone(); | |
1453 return true; | |
1454 } | |
1455 | |
1456 bool JavaThread::reguard_stack(void) { | |
1457 return reguard_stack(os::current_stack_pointer()); | |
1458 } | |
1459 | |
1460 | |
1461 void JavaThread::block_if_vm_exited() { | |
1462 if (_terminated == _vm_exited) { | |
1463 // _vm_exited is set at safepoint, and Threads_lock is never released | |
1464 // we will block here forever | |
1465 Threads_lock->lock_without_safepoint_check(); | |
1466 ShouldNotReachHere(); | |
1467 } | |
1468 } | |
1469 | |
1470 | |
1471 // Remove this ifdef when C1 is ported to the compiler interface. | |
1472 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
1473 | |
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1474 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1475 Thread() |
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1476 #ifndef SERIALGC |
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1477 , _satb_mark_queue(&_satb_mark_queue_set), |
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1478 _dirty_card_queue(&_dirty_card_queue_set) |
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1479 #endif // !SERIALGC |
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1480 { |
0 | 1481 if (TraceThreadEvents) { |
1482 tty->print_cr("creating thread %p", this); | |
1483 } | |
1484 initialize(); | |
4006 | 1485 _jni_attach_state = _not_attaching_via_jni; |
0 | 1486 set_entry_point(entry_point); |
1487 // Create the native thread itself. | |
1488 // %note runtime_23 | |
1489 os::ThreadType thr_type = os::java_thread; | |
1490 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
1491 os::java_thread; | |
1492 os::create_thread(this, thr_type, stack_sz); | |
6197 | 1493 _safepoint_visible = false; |
0 | 1494 // The _osthread may be NULL here because we ran out of memory (too many threads active). |
1495 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
1496 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
1497 // the exception consists of creating the exception object & initializing it, initialization | |
1498 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
1499 // | |
1500 // The thread is still suspended when we reach here. Thread must be explicit started | |
1501 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
1502 // by calling Threads:add. The reason why this is not done here, is because the thread | |
1503 // object must be fully initialized (take a look at JVM_Start) | |
1504 } | |
1505 | |
1506 JavaThread::~JavaThread() { | |
1507 if (TraceThreadEvents) { | |
1508 tty->print_cr("terminate thread %p", this); | |
1509 } | |
1510 | |
6197 | 1511 // Info NMT that this JavaThread is exiting, its memory |
1512 // recorder should be collected | |
1513 assert(!is_safepoint_visible(), "wrong state"); | |
1514 MemTracker::thread_exiting(this); | |
1515 | |
0 | 1516 // JSR166 -- return the parker to the free list |
1517 Parker::Release(_parker); | |
1518 _parker = NULL ; | |
1519 | |
1520 // Free any remaining previous UnrollBlock | |
1521 vframeArray* old_array = vframe_array_last(); | |
1522 | |
1523 if (old_array != NULL) { | |
1524 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
1525 old_array->set_unroll_block(NULL); | |
1526 delete old_info; | |
1527 delete old_array; | |
1528 } | |
1529 | |
1530 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
1531 if (deferred != NULL) { | |
1532 // This can only happen if thread is destroyed before deoptimization occurs. | |
1533 assert(deferred->length() != 0, "empty array!"); | |
1534 do { | |
1535 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
1536 deferred->remove_at(0); | |
1537 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
1538 delete dlv; | |
1539 } while (deferred->length() != 0); | |
1540 delete deferred; | |
1541 } | |
1542 | |
1543 // All Java related clean up happens in exit | |
1544 ThreadSafepointState::destroy(this); | |
1545 if (_thread_profiler != NULL) delete _thread_profiler; | |
1546 if (_thread_stat != NULL) delete _thread_stat; | |
1547 } | |
1548 | |
1549 | |
1550 // The first routine called by a new Java thread | |
1551 void JavaThread::run() { | |
1552 // initialize thread-local alloc buffer related fields | |
1553 this->initialize_tlab(); | |
1554 | |
1555 // used to test validitity of stack trace backs | |
1556 this->record_base_of_stack_pointer(); | |
1557 | |
1558 // Record real stack base and size. | |
1559 this->record_stack_base_and_size(); | |
1560 | |
1561 // Initialize thread local storage; set before calling MutexLocker | |
1562 this->initialize_thread_local_storage(); | |
1563 | |
1564 this->create_stack_guard_pages(); | |
1565 | |
1681
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1566 this->cache_global_variables(); |
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1567 |
0 | 1568 // Thread is now sufficient initialized to be handled by the safepoint code as being |
1569 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
1570 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
1571 | |
1572 assert(JavaThread::current() == this, "sanity check"); | |
1573 assert(!Thread::current()->owns_locks(), "sanity check"); | |
1574 | |
1575 DTRACE_THREAD_PROBE(start, this); | |
1576 | |
1577 // This operation might block. We call that after all safepoint checks for a new thread has | |
1578 // been completed. | |
1579 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1580 | |
1581 if (JvmtiExport::should_post_thread_life()) { | |
1582 JvmtiExport::post_thread_start(this); | |
1583 } | |
1584 | |
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1585 EVENT_BEGIN(TraceEventThreadStart, event); |
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1586 EVENT_COMMIT(event, |
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1587 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1588 |
0 | 1589 // We call another function to do the rest so we are sure that the stack addresses used |
1590 // from there will be lower than the stack base just computed | |
1591 thread_main_inner(); | |
1592 | |
1593 // Note, thread is no longer valid at this point! | |
1594 } | |
1595 | |
1596 | |
1597 void JavaThread::thread_main_inner() { | |
1598 assert(JavaThread::current() == this, "sanity check"); | |
1599 assert(this->threadObj() != NULL, "just checking"); | |
1600 | |
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1601 // Execute thread entry point unless this thread has a pending exception |
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1602 // or has been stopped before starting. |
0 | 1603 // Note: Due to JVM_StopThread we can have pending exceptions already! |
2162
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1604 if (!this->has_pending_exception() && |
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1605 !java_lang_Thread::is_stillborn(this->threadObj())) { |
4006 | 1606 { |
1607 ResourceMark rm(this); | |
1608 this->set_native_thread_name(this->get_thread_name()); | |
1609 } | |
0 | 1610 HandleMark hm(this); |
1611 this->entry_point()(this, this); | |
1612 } | |
1613 | |
1614 DTRACE_THREAD_PROBE(stop, this); | |
1615 | |
1616 this->exit(false); | |
1617 delete this; | |
1618 } | |
1619 | |
1620 | |
1621 static void ensure_join(JavaThread* thread) { | |
1622 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
1623 Handle threadObj(thread, thread->threadObj()); | |
1624 assert(threadObj.not_null(), "java thread object must exist"); | |
1625 ObjectLocker lock(threadObj, thread); | |
1626 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1627 thread->clear_pending_exception(); | |
1628 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
1629 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
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1630 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1631 // to complete once we've done the notify_all below |
0 | 1632 java_lang_Thread::set_thread(threadObj(), NULL); |
1633 lock.notify_all(thread); | |
1634 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1635 thread->clear_pending_exception(); | |
1636 } | |
1637 | |
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1638 |
0 | 1639 // For any new cleanup additions, please check to see if they need to be applied to |
1640 // cleanup_failed_attach_current_thread as well. | |
1641 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
1642 assert(this == JavaThread::current(), "thread consistency check"); | |
1643 if (!InitializeJavaLangSystem) return; | |
1644 | |
1645 HandleMark hm(this); | |
1646 Handle uncaught_exception(this, this->pending_exception()); | |
1647 this->clear_pending_exception(); | |
1648 Handle threadObj(this, this->threadObj()); | |
1649 assert(threadObj.not_null(), "Java thread object should be created"); | |
1650 | |
1651 if (get_thread_profiler() != NULL) { | |
1652 get_thread_profiler()->disengage(); | |
1653 ResourceMark rm; | |
1654 get_thread_profiler()->print(get_thread_name()); | |
1655 } | |
1656 | |
1657 | |
1658 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
1659 { | |
1660 EXCEPTION_MARK; | |
1661 | |
1662 CLEAR_PENDING_EXCEPTION; | |
1663 } | |
1664 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
1665 // has to be fixed by a runtime query method | |
1666 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
1667 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
1668 // java.lang.Thread.dispatchUncaughtException | |
1669 if (uncaught_exception.not_null()) { | |
1670 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
1671 { | |
1672 EXCEPTION_MARK; | |
1673 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
1674 // call it. Otherwise we have an older library without the JSR-166 changes, | |
1675 // so call ThreadGroup.uncaughtException() | |
1676 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
1677 CallInfo callinfo; | |
1142 | 1678 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1679 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
2177
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1680 vmSymbols::dispatchUncaughtException_name(), |
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1681 vmSymbols::throwable_void_signature(), |
0 | 1682 KlassHandle(), false, false, THREAD); |
1683 CLEAR_PENDING_EXCEPTION; | |
1684 methodHandle method = callinfo.selected_method(); | |
1685 if (method.not_null()) { | |
1686 JavaValue result(T_VOID); | |
1687 JavaCalls::call_virtual(&result, | |
1688 threadObj, thread_klass, | |
2177
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1689 vmSymbols::dispatchUncaughtException_name(), |
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1690 vmSymbols::throwable_void_signature(), |
0 | 1691 uncaught_exception, |
1692 THREAD); | |
1693 } else { | |
1142 | 1694 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
0 | 1695 JavaValue result(T_VOID); |
1696 JavaCalls::call_virtual(&result, | |
1697 group, thread_group, | |
2177
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1698 vmSymbols::uncaughtException_name(), |
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1699 vmSymbols::thread_throwable_void_signature(), |
0 | 1700 threadObj, // Arg 1 |
1701 uncaught_exception, // Arg 2 | |
1702 THREAD); | |
1703 } | |
2200
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1704 if (HAS_PENDING_EXCEPTION) { |
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1705 ResourceMark rm(this); |
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1706 jio_fprintf(defaultStream::error_stream(), |
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1707 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1708 " in thread \"%s\"\n", |
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1709 Klass::cast(pending_exception()->klass())->external_name(), |
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1710 get_thread_name()); |
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1711 CLEAR_PENDING_EXCEPTION; |
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1712 } |
0 | 1713 } |
1714 } | |
1715 | |
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1716 // Called before the java thread exit since we want to read info |
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1717 // from java_lang_Thread object |
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1718 EVENT_BEGIN(TraceEventThreadEnd, event); |
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1719 EVENT_COMMIT(event, |
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1720 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1721 |
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1722 // Call after last event on thread |
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1723 EVENT_THREAD_EXIT(this); |
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1724 |
0 | 1725 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during |
1726 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
1727 // is deprecated anyhow. | |
1728 { int count = 3; | |
1729 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
1730 EXCEPTION_MARK; | |
1731 JavaValue result(T_VOID); | |
1142 | 1732 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1733 JavaCalls::call_virtual(&result, |
1734 threadObj, thread_klass, | |
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1735 vmSymbols::exit_method_name(), |
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1736 vmSymbols::void_method_signature(), |
0 | 1737 THREAD); |
1738 CLEAR_PENDING_EXCEPTION; | |
1739 } | |
1740 } | |
1741 | |
1742 // notify JVMTI | |
1743 if (JvmtiExport::should_post_thread_life()) { | |
1744 JvmtiExport::post_thread_end(this); | |
1745 } | |
1746 | |
1747 // We have notified the agents that we are exiting, before we go on, | |
1748 // we must check for a pending external suspend request and honor it | |
1749 // in order to not surprise the thread that made the suspend request. | |
1750 while (true) { | |
1751 { | |
1752 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1753 if (!is_external_suspend()) { | |
1754 set_terminated(_thread_exiting); | |
1755 ThreadService::current_thread_exiting(this); | |
1756 break; | |
1757 } | |
1758 // Implied else: | |
1759 // Things get a little tricky here. We have a pending external | |
1760 // suspend request, but we are holding the SR_lock so we | |
1761 // can't just self-suspend. So we temporarily drop the lock | |
1762 // and then self-suspend. | |
1763 } | |
1764 | |
1765 ThreadBlockInVM tbivm(this); | |
1766 java_suspend_self(); | |
1767 | |
1768 // We're done with this suspend request, but we have to loop around | |
1769 // and check again. Eventually we will get SR_lock without a pending | |
1770 // external suspend request and will be able to mark ourselves as | |
1771 // exiting. | |
1772 } | |
1773 // no more external suspends are allowed at this point | |
1774 } else { | |
1775 // before_exit() has already posted JVMTI THREAD_END events | |
1776 } | |
1777 | |
1778 // Notify waiters on thread object. This has to be done after exit() is called | |
1779 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
1780 // group should have the destroyed bit set before waiters are notified). | |
1781 ensure_join(this); | |
1782 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
1783 | |
1784 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
1785 // held by this thread must be released. A detach operation must only | |
1786 // get here if there are no Java frames on the stack. Therefore, any | |
1787 // owned monitors at this point MUST be JNI-acquired monitors which are | |
1788 // pre-inflated and in the monitor cache. | |
1789 // | |
1790 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
1791 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
1792 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
1793 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
1794 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
1795 } | |
1796 | |
1797 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
1798 // is in a consistent state, in case GC happens | |
1799 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
1800 | |
1801 if (active_handles() != NULL) { | |
1802 JNIHandleBlock* block = active_handles(); | |
1803 set_active_handles(NULL); | |
1804 JNIHandleBlock::release_block(block); | |
1805 } | |
1806 | |
1807 if (free_handle_block() != NULL) { | |
1808 JNIHandleBlock* block = free_handle_block(); | |
1809 set_free_handle_block(NULL); | |
1810 JNIHandleBlock::release_block(block); | |
1811 } | |
1812 | |
1813 // These have to be removed while this is still a valid thread. | |
1814 remove_stack_guard_pages(); | |
1815 | |
1816 if (UseTLAB) { | |
1817 tlab().make_parsable(true); // retire TLAB | |
1818 } | |
1819 | |
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1820 if (JvmtiEnv::environments_might_exist()) { |
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1821 JvmtiExport::cleanup_thread(this); |
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1822 } |
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1823 |
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1824 #ifndef SERIALGC |
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1825 // We must flush G1-related buffers before removing a thread from |
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1826 // the list of active threads. |
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1827 if (UseG1GC) { |
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1828 flush_barrier_queues(); |
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1829 } |
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1830 #endif |
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1831 |
0 | 1832 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
1833 Threads::remove(this); | |
1834 } | |
1835 | |
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1836 #ifndef SERIALGC |
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1837 // Flush G1-related queues. |
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1838 void JavaThread::flush_barrier_queues() { |
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1839 satb_mark_queue().flush(); |
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1840 dirty_card_queue().flush(); |
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1841 } |
1842
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1842 |
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1843 void JavaThread::initialize_queues() { |
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1844 assert(!SafepointSynchronize::is_at_safepoint(), |
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1845 "we should not be at a safepoint"); |
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1846 |
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1847 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1848 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1849 // The SATB queue should have been constructed with its active |
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1850 // field set to false. |
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1851 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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1852 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1853 // If we are creating the thread during a marking cycle, we should |
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1854 // set the active field of the SATB queue to true. |
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1855 if (satb_queue_set.is_active()) { |
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1856 satb_queue.set_active(true); |
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1857 } |
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1858 |
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1859 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1860 // The dirty card queue should have been constructed with its |
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1861 // active field set to true. |
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1862 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1863 } |
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1864 #endif // !SERIALGC |
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1865 |
0 | 1866 void JavaThread::cleanup_failed_attach_current_thread() { |
441
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1867 if (get_thread_profiler() != NULL) { |
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1868 get_thread_profiler()->disengage(); |
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1869 ResourceMark rm; |
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1870 get_thread_profiler()->print(get_thread_name()); |
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1871 } |
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1872 |
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1873 if (active_handles() != NULL) { |
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1874 JNIHandleBlock* block = active_handles(); |
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1875 set_active_handles(NULL); |
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1876 JNIHandleBlock::release_block(block); |
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1877 } |
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1878 |
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1879 if (free_handle_block() != NULL) { |
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1880 JNIHandleBlock* block = free_handle_block(); |
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1881 set_free_handle_block(NULL); |
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1882 JNIHandleBlock::release_block(block); |
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1883 } |
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1884 |
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1885 // These have to be removed while this is still a valid thread. |
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1886 remove_stack_guard_pages(); |
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1887 |
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1888 if (UseTLAB) { |
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1889 tlab().make_parsable(true); // retire TLAB, if any |
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1890 } |
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1891 |
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1892 #ifndef SERIALGC |
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1893 if (UseG1GC) { |
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1894 flush_barrier_queues(); |
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1895 } |
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1896 #endif |
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1897 |
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1898 Threads::remove(this); |
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1899 delete this; |
0 | 1900 } |
1901 | |
1902 | |
441
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1903 |
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1904 |
0 | 1905 JavaThread* JavaThread::active() { |
1906 Thread* thread = ThreadLocalStorage::thread(); | |
1907 assert(thread != NULL, "just checking"); | |
1908 if (thread->is_Java_thread()) { | |
1909 return (JavaThread*) thread; | |
1910 } else { | |
1911 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
1912 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
1913 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
1914 assert(ret->is_Java_thread(), "must be a Java thread"); | |
1915 return ret; | |
1916 } | |
1917 } | |
1918 | |
1919 bool JavaThread::is_lock_owned(address adr) const { | |
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1920 if (Thread::is_lock_owned(adr)) return true; |
0 | 1921 |
1922 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
1923 if (chunk->contains(adr)) return true; | |
1924 } | |
1925 | |
1926 return false; | |
1927 } | |
1928 | |
1929 | |
1930 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
1931 chunk->set_next(monitor_chunks()); | |
1932 set_monitor_chunks(chunk); | |
1933 } | |
1934 | |
1935 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
1936 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
1937 if (monitor_chunks() == chunk) { | |
1938 set_monitor_chunks(chunk->next()); | |
1939 } else { | |
1940 MonitorChunk* prev = monitor_chunks(); | |
1941 while (prev->next() != chunk) prev = prev->next(); | |
1942 prev->set_next(chunk->next()); | |
1943 } | |
1944 } | |
1945 | |
1946 // JVM support. | |
1947 | |
1948 // Note: this function shouldn't block if it's called in | |
1949 // _thread_in_native_trans state (such as from | |
1950 // check_special_condition_for_native_trans()). | |
1951 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
1952 | |
1953 if (has_last_Java_frame() && has_async_condition()) { | |
1954 // If we are at a polling page safepoint (not a poll return) | |
1955 // then we must defer async exception because live registers | |
1956 // will be clobbered by the exception path. Poll return is | |
1957 // ok because the call we a returning from already collides | |
1958 // with exception handling registers and so there is no issue. | |
1959 // (The exception handling path kills call result registers but | |
1960 // this is ok since the exception kills the result anyway). | |
1961 | |
1962 if (is_at_poll_safepoint()) { | |
1963 // if the code we are returning to has deoptimized we must defer | |
1964 // the exception otherwise live registers get clobbered on the | |
1965 // exception path before deoptimization is able to retrieve them. | |
1966 // | |
1967 RegisterMap map(this, false); | |
1968 frame caller_fr = last_frame().sender(&map); | |
1969 assert(caller_fr.is_compiled_frame(), "what?"); | |
1970 if (caller_fr.is_deoptimized_frame()) { | |
1971 if (TraceExceptions) { | |
1972 ResourceMark rm; | |
1973 tty->print_cr("deferred async exception at compiled safepoint"); | |
1974 } | |
1975 return; | |
1976 } | |
1977 } | |
1978 } | |
1979 | |
1980 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
1981 if (condition == _no_async_condition) { | |
1982 // Conditions have changed since has_special_runtime_exit_condition() | |
1983 // was called: | |
1984 // - if we were here only because of an external suspend request, | |
1985 // then that was taken care of above (or cancelled) so we are done | |
1986 // - if we were here because of another async request, then it has | |
1987 // been cleared between the has_special_runtime_exit_condition() | |
1988 // and now so again we are done | |
1989 return; | |
1990 } | |
1991 | |
1992 // Check for pending async. exception | |
1993 if (_pending_async_exception != NULL) { | |
1994 // Only overwrite an already pending exception, if it is not a threadDeath. | |
1142 | 1995 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 1996 |
1997 // We cannot call Exceptions::_throw(...) here because we cannot block | |
1998 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
1999 | |
2000 if (TraceExceptions) { | |
2001 ResourceMark rm; | |
2002 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
2003 if (has_last_Java_frame() ) { | |
2004 frame f = last_frame(); | |
2005 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
2006 } | |
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2007 tty->print_cr(" of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
0 | 2008 } |
2009 _pending_async_exception = NULL; | |
2010 clear_has_async_exception(); | |
2011 } | |
2012 } | |
2013 | |
2014 if (check_unsafe_error && | |
2015 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
2016 condition = _no_async_condition; // done | |
2017 switch (thread_state()) { | |
2018 case _thread_in_vm: | |
2019 { | |
2020 JavaThread* THREAD = this; | |
2021 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
2022 } | |
2023 case _thread_in_native: | |
2024 { | |
2025 ThreadInVMfromNative tiv(this); | |
2026 JavaThread* THREAD = this; | |
2027 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
2028 } | |
2029 case _thread_in_Java: | |
2030 { | |
2031 ThreadInVMfromJava tiv(this); | |
2032 JavaThread* THREAD = this; | |
2033 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
2034 } | |
2035 default: | |
2036 ShouldNotReachHere(); | |
2037 } | |
2038 } | |
2039 | |
2040 assert(condition == _no_async_condition || has_pending_exception() || | |
2041 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
2042 "must have handled the async condition, if no exception"); | |
2043 } | |
2044 | |
2045 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
2046 // | |
2047 // Check for pending external suspend. Internal suspend requests do | |
2048 // not use handle_special_runtime_exit_condition(). | |
2049 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2050 // thread is not the current thread. In older versions of jdbx, jdbx | |
2051 // threads could call into the VM with another thread's JNIEnv so we | |
2052 // can be here operating on behalf of a suspended thread (4432884). | |
2053 bool do_self_suspend = is_external_suspend_with_lock(); | |
2054 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
2055 // | |
2056 // Because thread is external suspended the safepoint code will count | |
2057 // thread as at a safepoint. This can be odd because we can be here | |
2058 // as _thread_in_Java which would normally transition to _thread_blocked | |
2059 // at a safepoint. We would like to mark the thread as _thread_blocked | |
2060 // before calling java_suspend_self like all other callers of it but | |
2061 // we must then observe proper safepoint protocol. (We can't leave | |
2062 // _thread_blocked with a safepoint in progress). However we can be | |
2063 // here as _thread_in_native_trans so we can't use a normal transition | |
2064 // constructor/destructor pair because they assert on that type of | |
2065 // transition. We could do something like: | |
2066 // | |
2067 // JavaThreadState state = thread_state(); | |
2068 // set_thread_state(_thread_in_vm); | |
2069 // { | |
2070 // ThreadBlockInVM tbivm(this); | |
2071 // java_suspend_self() | |
2072 // } | |
2073 // set_thread_state(_thread_in_vm_trans); | |
2074 // if (safepoint) block; | |
2075 // set_thread_state(state); | |
2076 // | |
2077 // but that is pretty messy. Instead we just go with the way the | |
2078 // code has worked before and note that this is the only path to | |
2079 // java_suspend_self that doesn't put the thread in _thread_blocked | |
2080 // mode. | |
2081 | |
2082 frame_anchor()->make_walkable(this); | |
2083 java_suspend_self(); | |
2084 | |
2085 // We might be here for reasons in addition to the self-suspend request | |
2086 // so check for other async requests. | |
2087 } | |
2088 | |
2089 if (check_asyncs) { | |
2090 check_and_handle_async_exceptions(); | |
2091 } | |
2092 } | |
2093 | |
2094 void JavaThread::send_thread_stop(oop java_throwable) { | |
2095 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
2096 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
2097 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
2098 | |
2099 // Do not throw asynchronous exceptions against the compiler thread | |
2100 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
2101 if (is_Compiler_thread()) return; | |
2102 | |
2103 { | |
2104 // Actually throw the Throwable against the target Thread - however | |
2105 // only if there is no thread death exception installed already. | |
1142 | 2106 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 2107 // If the topmost frame is a runtime stub, then we are calling into |
2108 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
2109 // must deoptimize the caller before continuing, as the compiled exception handler table | |
2110 // may not be valid | |
2111 if (has_last_Java_frame()) { | |
2112 frame f = last_frame(); | |
2113 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
2114 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2115 RegisterMap reg_map(this, UseBiasedLocking); | |
2116 frame compiled_frame = f.sender(®_map); | |
2117 if (compiled_frame.can_be_deoptimized()) { | |
2118 Deoptimization::deoptimize(this, compiled_frame, ®_map); | |
2119 } | |
2120 } | |
2121 } | |
2122 | |
2123 // Set async. pending exception in thread. | |
2124 set_pending_async_exception(java_throwable); | |
2125 | |
2126 if (TraceExceptions) { | |
2127 ResourceMark rm; | |
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2128 tty->print_cr("Pending Async. exception installed of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
0 | 2129 } |
2130 // for AbortVMOnException flag | |
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2131 NOT_PRODUCT(Exceptions::debug_check_abort(InstanceKlass::cast(_pending_async_exception->klass())->external_name())); |
0 | 2132 } |
2133 } | |
2134 | |
2135 | |
2136 // Interrupt thread so it will wake up from a potential wait() | |
2137 Thread::interrupt(this); | |
2138 } | |
2139 | |
2140 // External suspension mechanism. | |
2141 // | |
2142 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
2143 // to any VM_locks and it is at a transition | |
2144 // Self-suspension will happen on the transition out of the vm. | |
2145 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
2146 // | |
2147 // Guarantees on return: | |
2148 // + Target thread will not execute any new bytecode (that's why we need to | |
2149 // force a safepoint) | |
2150 // + Target thread will not enter any new monitors | |
2151 // | |
2152 void JavaThread::java_suspend() { | |
2153 { MutexLocker mu(Threads_lock); | |
2154 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
2155 return; | |
2156 } | |
2157 } | |
2158 | |
2159 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2160 if (!is_external_suspend()) { | |
2161 // a racing resume has cancelled us; bail out now | |
2162 return; | |
2163 } | |
2164 | |
2165 // suspend is done | |
2166 uint32_t debug_bits = 0; | |
2167 // Warning: is_ext_suspend_completed() may temporarily drop the | |
2168 // SR_lock to allow the thread to reach a stable thread state if | |
2169 // it is currently in a transient thread state. | |
2170 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
2171 SuspendRetryDelay, &debug_bits) ) { | |
2172 return; | |
2173 } | |
2174 } | |
2175 | |
2176 VM_ForceSafepoint vm_suspend; | |
2177 VMThread::execute(&vm_suspend); | |
2178 } | |
2179 | |
2180 // Part II of external suspension. | |
2181 // A JavaThread self suspends when it detects a pending external suspend | |
2182 // request. This is usually on transitions. It is also done in places | |
2183 // where continuing to the next transition would surprise the caller, | |
2184 // e.g., monitor entry. | |
2185 // | |
2186 // Returns the number of times that the thread self-suspended. | |
2187 // | |
2188 // Note: DO NOT call java_suspend_self() when you just want to block current | |
2189 // thread. java_suspend_self() is the second stage of cooperative | |
2190 // suspension for external suspend requests and should only be used | |
2191 // to complete an external suspend request. | |
2192 // | |
2193 int JavaThread::java_suspend_self() { | |
2194 int ret = 0; | |
2195 | |
2196 // we are in the process of exiting so don't suspend | |
2197 if (is_exiting()) { | |
2198 clear_external_suspend(); | |
2199 return ret; | |
2200 } | |
2201 | |
2202 assert(_anchor.walkable() || | |
2203 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
2204 "must have walkable stack"); | |
2205 | |
2206 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2207 | |
979 | 2208 assert(!this->is_ext_suspended(), |
0 | 2209 "a thread trying to self-suspend should not already be suspended"); |
2210 | |
2211 if (this->is_suspend_equivalent()) { | |
2212 // If we are self-suspending as a result of the lifting of a | |
2213 // suspend equivalent condition, then the suspend_equivalent | |
2214 // flag is not cleared until we set the ext_suspended flag so | |
2215 // that wait_for_ext_suspend_completion() returns consistent | |
2216 // results. | |
2217 this->clear_suspend_equivalent(); | |
2218 } | |
2219 | |
2220 // A racing resume may have cancelled us before we grabbed SR_lock | |
2221 // above. Or another external suspend request could be waiting for us | |
2222 // by the time we return from SR_lock()->wait(). The thread | |
2223 // that requested the suspension may already be trying to walk our | |
2224 // stack and if we return now, we can change the stack out from under | |
2225 // it. This would be a "bad thing (TM)" and cause the stack walker | |
2226 // to crash. We stay self-suspended until there are no more pending | |
2227 // external suspend requests. | |
2228 while (is_external_suspend()) { | |
2229 ret++; | |
2230 this->set_ext_suspended(); | |
2231 | |
2232 // _ext_suspended flag is cleared by java_resume() | |
2233 while (is_ext_suspended()) { | |
2234 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
2235 } | |
2236 } | |
2237 | |
2238 return ret; | |
2239 } | |
2240 | |
2241 #ifdef ASSERT | |
2242 // verify the JavaThread has not yet been published in the Threads::list, and | |
2243 // hence doesn't need protection from concurrent access at this stage | |
2244 void JavaThread::verify_not_published() { | |
2245 if (!Threads_lock->owned_by_self()) { | |
2246 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
2247 assert( !Threads::includes(this), | |
2248 "java thread shouldn't have been published yet!"); | |
2249 } | |
2250 else { | |
2251 assert( !Threads::includes(this), | |
2252 "java thread shouldn't have been published yet!"); | |
2253 } | |
2254 } | |
2255 #endif | |
2256 | |
2257 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2258 // progress or when _suspend_flags is non-zero. | |
2259 // Current thread needs to self-suspend if there is a suspend request and/or | |
2260 // block if a safepoint is in progress. | |
2261 // Async exception ISN'T checked. | |
2262 // Note only the ThreadInVMfromNative transition can call this function | |
2263 // directly and when thread state is _thread_in_native_trans | |
2264 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
2265 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
2266 | |
2267 JavaThread *curJT = JavaThread::current(); | |
2268 bool do_self_suspend = thread->is_external_suspend(); | |
2269 | |
2270 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
2271 | |
2272 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2273 // thread is not the current thread. In older versions of jdbx, jdbx | |
2274 // threads could call into the VM with another thread's JNIEnv so we | |
2275 // can be here operating on behalf of a suspended thread (4432884). | |
2276 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
2277 JavaThreadState state = thread->thread_state(); | |
2278 | |
2279 // We mark this thread_blocked state as a suspend-equivalent so | |
2280 // that a caller to is_ext_suspend_completed() won't be confused. | |
2281 // The suspend-equivalent state is cleared by java_suspend_self(). | |
2282 thread->set_suspend_equivalent(); | |
2283 | |
2284 // If the safepoint code sees the _thread_in_native_trans state, it will | |
2285 // wait until the thread changes to other thread state. There is no | |
2286 // guarantee on how soon we can obtain the SR_lock and complete the | |
2287 // self-suspend request. It would be a bad idea to let safepoint wait for | |
2288 // too long. Temporarily change the state to _thread_blocked to | |
2289 // let the VM thread know that this thread is ready for GC. The problem | |
2290 // of changing thread state is that safepoint could happen just after | |
2291 // java_suspend_self() returns after being resumed, and VM thread will | |
2292 // see the _thread_blocked state. We must check for safepoint | |
2293 // after restoring the state and make sure we won't leave while a safepoint | |
2294 // is in progress. | |
2295 thread->set_thread_state(_thread_blocked); | |
2296 thread->java_suspend_self(); | |
2297 thread->set_thread_state(state); | |
2298 // Make sure new state is seen by VM thread | |
2299 if (os::is_MP()) { | |
2300 if (UseMembar) { | |
2301 // Force a fence between the write above and read below | |
2302 OrderAccess::fence(); | |
2303 } else { | |
2304 // Must use this rather than serialization page in particular on Windows | |
2305 InterfaceSupport::serialize_memory(thread); | |
2306 } | |
2307 } | |
2308 } | |
2309 | |
2310 if (SafepointSynchronize::do_call_back()) { | |
2311 // If we are safepointing, then block the caller which may not be | |
2312 // the same as the target thread (see above). | |
2313 SafepointSynchronize::block(curJT); | |
2314 } | |
2315 | |
2316 if (thread->is_deopt_suspend()) { | |
2317 thread->clear_deopt_suspend(); | |
2318 RegisterMap map(thread, false); | |
2319 frame f = thread->last_frame(); | |
2320 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
2321 f = f.sender(&map); | |
2322 } | |
2323 if (f.id() == thread->must_deopt_id()) { | |
2324 thread->clear_must_deopt_id(); | |
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2325 f.deoptimize(thread); |
0 | 2326 } else { |
2327 fatal("missed deoptimization!"); | |
2328 } | |
2329 } | |
2330 } | |
2331 | |
2332 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2333 // progress or when _suspend_flags is non-zero. | |
2334 // Current thread needs to self-suspend if there is a suspend request and/or | |
2335 // block if a safepoint is in progress. | |
2336 // Also check for pending async exception (not including unsafe access error). | |
2337 // Note only the native==>VM/Java barriers can call this function and when | |
2338 // thread state is _thread_in_native_trans. | |
2339 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
2340 check_safepoint_and_suspend_for_native_trans(thread); | |
2341 | |
2342 if (thread->has_async_exception()) { | |
2343 // We are in _thread_in_native_trans state, don't handle unsafe | |
2344 // access error since that may block. | |
2345 thread->check_and_handle_async_exceptions(false); | |
2346 } | |
2347 } | |
2348 | |
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2349 // This is a variant of the normal |
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2350 // check_special_condition_for_native_trans with slightly different |
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2351 // semantics for use by critical native wrappers. It does all the |
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2352 // normal checks but also performs the transition back into |
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2353 // thread_in_Java state. This is required so that critical natives |
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2354 // can potentially block and perform a GC if they are the last thread |
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|
2355 // exiting the GC_locker. |
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|
2356 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) { |
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2357 check_special_condition_for_native_trans(thread); |
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|
2358 |
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2359 // Finish the transition |
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2360 thread->set_thread_state(_thread_in_Java); |
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2361 |
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2362 if (thread->do_critical_native_unlock()) { |
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2363 ThreadInVMfromJavaNoAsyncException tiv(thread); |
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2364 GC_locker::unlock_critical(thread); |
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2365 thread->clear_critical_native_unlock(); |
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2366 } |
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2367 } |
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|
2368 |
0 | 2369 // We need to guarantee the Threads_lock here, since resumes are not |
2370 // allowed during safepoint synchronization | |
2371 // Can only resume from an external suspension | |
2372 void JavaThread::java_resume() { | |
2373 assert_locked_or_safepoint(Threads_lock); | |
2374 | |
2375 // Sanity check: thread is gone, has started exiting or the thread | |
2376 // was not externally suspended. | |
2377 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
2378 return; | |
2379 } | |
2380 | |
2381 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2382 | |
2383 clear_external_suspend(); | |
2384 | |
2385 if (is_ext_suspended()) { | |
2386 clear_ext_suspended(); | |
2387 SR_lock()->notify_all(); | |
2388 } | |
2389 } | |
2390 | |
2391 void JavaThread::create_stack_guard_pages() { | |
2392 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
2393 address low_addr = stack_base() - stack_size(); | |
2394 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2395 | |
2396 int allocate = os::allocate_stack_guard_pages(); | |
2397 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
2398 | |
1320
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2399 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
0 | 2400 warning("Attempt to allocate stack guard pages failed."); |
2401 return; | |
2402 } | |
2403 | |
2404 if (os::guard_memory((char *) low_addr, len)) { | |
2405 _stack_guard_state = stack_guard_enabled; | |
2406 } else { | |
2407 warning("Attempt to protect stack guard pages failed."); | |
2408 if (os::uncommit_memory((char *) low_addr, len)) { | |
2409 warning("Attempt to deallocate stack guard pages failed."); | |
2410 } | |
2411 } | |
2412 } | |
2413 | |
2414 void JavaThread::remove_stack_guard_pages() { | |
2415 if (_stack_guard_state == stack_guard_unused) return; | |
2416 address low_addr = stack_base() - stack_size(); | |
2417 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2418 | |
2419 if (os::allocate_stack_guard_pages()) { | |
1320
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2420 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
0 | 2421 _stack_guard_state = stack_guard_unused; |
2422 } else { | |
2423 warning("Attempt to deallocate stack guard pages failed."); | |
2424 } | |
2425 } else { | |
2426 if (_stack_guard_state == stack_guard_unused) return; | |
2427 if (os::unguard_memory((char *) low_addr, len)) { | |
2428 _stack_guard_state = stack_guard_unused; | |
2429 } else { | |
2430 warning("Attempt to unprotect stack guard pages failed."); | |
2431 } | |
2432 } | |
2433 } | |
2434 | |
2435 void JavaThread::enable_stack_yellow_zone() { | |
2436 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2437 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
2438 | |
2439 // The base notation is from the stacks point of view, growing downward. | |
2440 // We need to adjust it to work correctly with guard_memory() | |
2441 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2442 | |
2443 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
2444 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
2445 | |
2446 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
2447 _stack_guard_state = stack_guard_enabled; | |
2448 } else { | |
2449 warning("Attempt to guard stack yellow zone failed."); | |
2450 } | |
2451 enable_register_stack_guard(); | |
2452 } | |
2453 | |
2454 void JavaThread::disable_stack_yellow_zone() { | |
2455 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2456 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
2457 | |
2458 // Simply return if called for a thread that does not use guard pages. | |
2459 if (_stack_guard_state == stack_guard_unused) return; | |
2460 | |
2461 // The base notation is from the stacks point of view, growing downward. | |
2462 // We need to adjust it to work correctly with guard_memory() | |
2463 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2464 | |
2465 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
2466 _stack_guard_state = stack_guard_yellow_disabled; | |
2467 } else { | |
2468 warning("Attempt to unguard stack yellow zone failed."); | |
2469 } | |
2470 disable_register_stack_guard(); | |
2471 } | |
2472 | |
2473 void JavaThread::enable_stack_red_zone() { | |
2474 // The base notation is from the stacks point of view, growing downward. | |
2475 // We need to adjust it to work correctly with guard_memory() | |
2476 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2477 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2478 | |
2479 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
2480 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
2481 | |
2482 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
2483 warning("Attempt to guard stack red zone failed."); | |
2484 } | |
2485 } | |
2486 | |
2487 void JavaThread::disable_stack_red_zone() { | |
2488 // The base notation is from the stacks point of view, growing downward. | |
2489 // We need to adjust it to work correctly with guard_memory() | |
2490 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2491 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2492 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
2493 warning("Attempt to unguard stack red zone failed."); | |
2494 } | |
2495 } | |
2496 | |
2497 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
2498 // ignore is there is no stack | |
2499 if (!has_last_Java_frame()) return; | |
2500 // traverse the stack frames. Starts from top frame. | |
2501 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2502 frame* fr = fst.current(); | |
2503 f(fr, fst.register_map()); | |
2504 } | |
2505 } | |
2506 | |
2507 | |
2508 #ifndef PRODUCT | |
2509 // Deoptimization | |
2510 // Function for testing deoptimization | |
2511 void JavaThread::deoptimize() { | |
2512 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2513 StackFrameStream fst(this, UseBiasedLocking); | |
2514 bool deopt = false; // Dump stack only if a deopt actually happens. | |
2515 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
2516 // Iterate over all frames in the thread and deoptimize | |
2517 for(; !fst.is_done(); fst.next()) { | |
2518 if(fst.current()->can_be_deoptimized()) { | |
2519 | |
2520 if (only_at) { | |
2521 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
2522 // consists of comma or carriage return separated numbers so | |
2523 // search for the current bci in that string. | |
2524 address pc = fst.current()->pc(); | |
2525 nmethod* nm = (nmethod*) fst.current()->cb(); | |
2526 ScopeDesc* sd = nm->scope_desc_at( pc); | |
2527 char buffer[8]; | |
2528 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
2529 size_t len = strlen(buffer); | |
2530 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
2531 while (found != NULL) { | |
2532 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
2533 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
2534 // Check that the bci found is bracketed by terminators. | |
2535 break; | |
2536 } | |
2537 found = strstr(found + 1, buffer); | |
2538 } | |
2539 if (!found) { | |
2540 continue; | |
2541 } | |
2542 } | |
2543 | |
2544 if (DebugDeoptimization && !deopt) { | |
2545 deopt = true; // One-time only print before deopt | |
2546 tty->print_cr("[BEFORE Deoptimization]"); | |
2547 trace_frames(); | |
2548 trace_stack(); | |
2549 } | |
2550 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2551 } | |
2552 } | |
2553 | |
2554 if (DebugDeoptimization && deopt) { | |
2555 tty->print_cr("[AFTER Deoptimization]"); | |
2556 trace_frames(); | |
2557 } | |
2558 } | |
2559 | |
2560 | |
2561 // Make zombies | |
2562 void JavaThread::make_zombies() { | |
2563 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2564 if (fst.current()->can_be_deoptimized()) { | |
2565 // it is a Java nmethod | |
2566 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
2567 nm->make_not_entrant(); | |
2568 } | |
2569 } | |
2570 } | |
2571 #endif // PRODUCT | |
2572 | |
2573 | |
2574 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
2575 if (!has_last_Java_frame()) return; | |
2576 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2577 StackFrameStream fst(this, UseBiasedLocking); | |
2578 for(; !fst.is_done(); fst.next()) { | |
2579 if (fst.current()->should_be_deoptimized()) { | |
2580 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2581 } | |
2582 } | |
2583 } | |
2584 | |
2585 | |
2586 // GC support | |
2587 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
2588 | |
2589 void JavaThread::gc_epilogue() { | |
2590 frames_do(frame_gc_epilogue); | |
2591 } | |
2592 | |
2593 | |
2594 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
2595 | |
2596 void JavaThread::gc_prologue() { | |
2597 frames_do(frame_gc_prologue); | |
2598 } | |
2599 | |
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2600 // If the caller is a NamedThread, then remember, in the current scope, |
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2601 // the given JavaThread in its _processed_thread field. |
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|
2602 class RememberProcessedThread: public StackObj { |
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|
2603 NamedThread* _cur_thr; |
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|
2604 public: |
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2605 RememberProcessedThread(JavaThread* jthr) { |
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2606 Thread* thread = Thread::current(); |
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2607 if (thread->is_Named_thread()) { |
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2608 _cur_thr = (NamedThread *)thread; |
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2609 _cur_thr->set_processed_thread(jthr); |
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|
2610 } else { |
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2611 _cur_thr = NULL; |
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|
2612 } |
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|
2613 } |
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|
2614 |
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2615 ~RememberProcessedThread() { |
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2616 if (_cur_thr) { |
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2617 _cur_thr->set_processed_thread(NULL); |
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|
2618 } |
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|
2619 } |
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2620 }; |
0 | 2621 |
989
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2622 void JavaThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
1166 | 2623 // Verify that the deferred card marks have been flushed. |
2624 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
1027
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2625 |
0 | 2626 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
2627 // since there may be more than one thread using each ThreadProfiler. | |
2628 | |
2629 // Traverse the GCHandles | |
989
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|
2630 Thread::oops_do(f, cf); |
0 | 2631 |
2632 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2633 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2634 | |
2635 if (has_last_Java_frame()) { | |
1119
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2636 // Record JavaThread to GC thread |
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|
2637 RememberProcessedThread rpt(this); |
0 | 2638 |
2639 // Traverse the privileged stack | |
2640 if (_privileged_stack_top != NULL) { | |
2641 _privileged_stack_top->oops_do(f); | |
2642 } | |
2643 | |
2644 // traverse the registered growable array | |
2645 if (_array_for_gc != NULL) { | |
2646 for (int index = 0; index < _array_for_gc->length(); index++) { | |
2647 f->do_oop(_array_for_gc->adr_at(index)); | |
2648 } | |
2649 } | |
2650 | |
2651 // Traverse the monitor chunks | |
2652 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
2653 chunk->oops_do(f); | |
2654 } | |
2655 | |
2656 // Traverse the execution stack | |
2657 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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2658 fst.current()->oops_do(f, cf, fst.register_map()); |
0 | 2659 } |
2660 } | |
2661 | |
2662 // callee_target is never live across a gc point so NULL it here should | |
2663 // it still contain a methdOop. | |
2664 | |
2665 set_callee_target(NULL); | |
2666 | |
2667 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
2668 // If we have deferred set_locals there might be oops waiting to be | |
2669 // written | |
2670 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
2671 if (list != NULL) { | |
2672 for (int i = 0; i < list->length(); i++) { | |
2673 list->at(i)->oops_do(f); | |
2674 } | |
2675 } | |
2676 | |
2677 // Traverse instance variables at the end since the GC may be moving things | |
2678 // around using this function | |
2679 f->do_oop((oop*) &_threadObj); | |
2680 f->do_oop((oop*) &_vm_result); | |
2681 f->do_oop((oop*) &_exception_oop); | |
2682 f->do_oop((oop*) &_pending_async_exception); | |
2683 | |
2684 if (jvmti_thread_state() != NULL) { | |
2685 jvmti_thread_state()->oops_do(f); | |
2686 } | |
2687 } | |
2688 | |
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|
2689 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
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|
2690 Thread::nmethods_do(cf); // (super method is a no-op) |
0 | 2691 |
2692 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2693 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2694 | |
2695 if (has_last_Java_frame()) { | |
2696 // Traverse the execution stack | |
2697 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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|
2698 fst.current()->nmethods_do(cf); |
0 | 2699 } |
2700 } | |
2701 } | |
2702 | |
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2703 void JavaThread::metadata_do(void f(Metadata*)) { |
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|
2704 Thread::metadata_do(f); |
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|
2705 if (has_last_Java_frame()) { |
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|
2706 // Traverse the execution stack to call f() on the methods in the stack |
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|
2707 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { |
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|
2708 fst.current()->metadata_do(f); |
da91efe96a93
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|
2709 } |
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|
2710 } else if (is_Compiler_thread()) { |
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|
2711 // need to walk ciMetadata in current compile tasks to keep alive. |
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2712 CompilerThread* ct = (CompilerThread*)this; |
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2713 if (ct->env() != NULL) { |
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2714 ct->env()->metadata_do(f); |
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2715 } |
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2716 } |
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2717 } |
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2718 |
0 | 2719 // Printing |
2720 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
2721 switch (_thread_state) { | |
2722 case _thread_uninitialized: return "_thread_uninitialized"; | |
2723 case _thread_new: return "_thread_new"; | |
2724 case _thread_new_trans: return "_thread_new_trans"; | |
2725 case _thread_in_native: return "_thread_in_native"; | |
2726 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
2727 case _thread_in_vm: return "_thread_in_vm"; | |
2728 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
2729 case _thread_in_Java: return "_thread_in_Java"; | |
2730 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
2731 case _thread_blocked: return "_thread_blocked"; | |
2732 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
2733 default: return "unknown thread state"; | |
2734 } | |
2735 } | |
2736 | |
2737 #ifndef PRODUCT | |
2738 void JavaThread::print_thread_state_on(outputStream *st) const { | |
2739 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
2740 }; | |
2741 void JavaThread::print_thread_state() const { | |
2742 print_thread_state_on(tty); | |
2743 }; | |
2744 #endif // PRODUCT | |
2745 | |
2746 // Called by Threads::print() for VM_PrintThreads operation | |
2747 void JavaThread::print_on(outputStream *st) const { | |
2748 st->print("\"%s\" ", get_thread_name()); | |
2749 oop thread_oop = threadObj(); | |
6766 | 2750 if (thread_oop != NULL) { |
2751 st->print("#" INT64_FORMAT " ", java_lang_Thread::thread_id(thread_oop)); | |
2752 if (java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
2753 st->print("prio=%d ", java_lang_Thread::priority(thread_oop)); | |
2754 } | |
0 | 2755 Thread::print_on(st); |
2756 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
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2757 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
0 | 2758 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
2759 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
2760 } | |
2761 #ifndef PRODUCT | |
2762 print_thread_state_on(st); | |
2763 _safepoint_state->print_on(st); | |
2764 #endif // PRODUCT | |
2765 } | |
2766 | |
2767 // Called by fatal error handler. The difference between this and | |
2768 // JavaThread::print() is that we can't grab lock or allocate memory. | |
2769 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
2770 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
2771 oop thread_obj = threadObj(); | |
2772 if (thread_obj != NULL) { | |
2773 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
2774 } | |
2775 st->print(" ["); | |
2776 st->print("%s", _get_thread_state_name(_thread_state)); | |
2777 if (osthread()) { | |
2778 st->print(", id=%d", osthread()->thread_id()); | |
2779 } | |
2780 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
2781 _stack_base - _stack_size, _stack_base); | |
2782 st->print("]"); | |
2783 return; | |
2784 } | |
2785 | |
2786 // Verification | |
2787 | |
2788 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
2789 | |
2790 void JavaThread::verify() { | |
2791 // Verify oops in the thread. | |
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2792 oops_do(&VerifyOopClosure::verify_oop, NULL); |
0 | 2793 |
2794 // Verify the stack frames. | |
2795 frames_do(frame_verify); | |
2796 } | |
2797 | |
2798 // CR 6300358 (sub-CR 2137150) | |
2799 // Most callers of this method assume that it can't return NULL but a | |
2800 // thread may not have a name whilst it is in the process of attaching to | |
2801 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
2802 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
2803 // if vm exit occurs during initialization). These cases can all be accounted | |
2804 // for such that this method never returns NULL. | |
2805 const char* JavaThread::get_thread_name() const { | |
2806 #ifdef ASSERT | |
2807 // early safepoints can hit while current thread does not yet have TLS | |
2808 if (!SafepointSynchronize::is_at_safepoint()) { | |
2809 Thread *cur = Thread::current(); | |
2810 if (!(cur->is_Java_thread() && cur == this)) { | |
2811 // Current JavaThreads are allowed to get their own name without | |
2812 // the Threads_lock. | |
2813 assert_locked_or_safepoint(Threads_lock); | |
2814 } | |
2815 } | |
2816 #endif // ASSERT | |
2817 return get_thread_name_string(); | |
2818 } | |
2819 | |
2820 // Returns a non-NULL representation of this thread's name, or a suitable | |
2821 // descriptive string if there is no set name | |
2822 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
2823 const char* name_str; | |
2824 oop thread_obj = threadObj(); | |
2825 if (thread_obj != NULL) { | |
2826 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
2827 if (name != NULL) { | |
2828 if (buf == NULL) { | |
2829 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2830 } | |
2831 else { | |
2832 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
2833 } | |
2834 } | |
4006 | 2835 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 |
0 | 2836 name_str = "<no-name - thread is attaching>"; |
2837 } | |
2838 else { | |
2839 name_str = Thread::name(); | |
2840 } | |
2841 } | |
2842 else { | |
2843 name_str = Thread::name(); | |
2844 } | |
2845 assert(name_str != NULL, "unexpected NULL thread name"); | |
2846 return name_str; | |
2847 } | |
2848 | |
2849 | |
2850 const char* JavaThread::get_threadgroup_name() const { | |
2851 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2852 oop thread_obj = threadObj(); | |
2853 if (thread_obj != NULL) { | |
2854 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2855 if (thread_group != NULL) { | |
2856 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
2857 // ThreadGroup.name can be null | |
2858 if (name != NULL) { | |
2859 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2860 return str; | |
2861 } | |
2862 } | |
2863 } | |
2864 return NULL; | |
2865 } | |
2866 | |
2867 const char* JavaThread::get_parent_name() const { | |
2868 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2869 oop thread_obj = threadObj(); | |
2870 if (thread_obj != NULL) { | |
2871 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2872 if (thread_group != NULL) { | |
2873 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
2874 if (parent != NULL) { | |
2875 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
2876 // ThreadGroup.name can be null | |
2877 if (name != NULL) { | |
2878 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2879 return str; | |
2880 } | |
2881 } | |
2882 } | |
2883 } | |
2884 return NULL; | |
2885 } | |
2886 | |
2887 ThreadPriority JavaThread::java_priority() const { | |
2888 oop thr_oop = threadObj(); | |
2889 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
2890 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
2891 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
2892 return priority; | |
2893 } | |
2894 | |
2895 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
2896 | |
2897 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
2898 // Link Java Thread object <-> C++ Thread | |
2899 | |
2900 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
2901 // and put it into a new Handle. The Handle "thread_oop" can then | |
2902 // be used to pass the C++ thread object to other methods. | |
2903 | |
2904 // Set the Java level thread object (jthread) field of the | |
2905 // new thread (a JavaThread *) to C++ thread object using the | |
2906 // "thread_oop" handle. | |
2907 | |
2908 // Set the thread field (a JavaThread *) of the | |
2909 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
2910 | |
2911 Handle thread_oop(Thread::current(), | |
2912 JNIHandles::resolve_non_null(jni_thread)); | |
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2913 assert(InstanceKlass::cast(thread_oop->klass())->is_linked(), |
0 | 2914 "must be initialized"); |
2915 set_threadObj(thread_oop()); | |
2916 java_lang_Thread::set_thread(thread_oop(), this); | |
2917 | |
2918 if (prio == NoPriority) { | |
2919 prio = java_lang_Thread::priority(thread_oop()); | |
2920 assert(prio != NoPriority, "A valid priority should be present"); | |
2921 } | |
2922 | |
2923 // Push the Java priority down to the native thread; needs Threads_lock | |
2924 Thread::set_priority(this, prio); | |
2925 | |
2926 // Add the new thread to the Threads list and set it in motion. | |
2927 // We must have threads lock in order to call Threads::add. | |
2928 // It is crucial that we do not block before the thread is | |
2929 // added to the Threads list for if a GC happens, then the java_thread oop | |
2930 // will not be visited by GC. | |
2931 Threads::add(this); | |
2932 } | |
2933 | |
2934 oop JavaThread::current_park_blocker() { | |
2935 // Support for JSR-166 locks | |
2936 oop thread_oop = threadObj(); | |
242 | 2937 if (thread_oop != NULL && |
2938 JDK_Version::current().supports_thread_park_blocker()) { | |
0 | 2939 return java_lang_Thread::park_blocker(thread_oop); |
2940 } | |
2941 return NULL; | |
2942 } | |
2943 | |
2944 | |
2945 void JavaThread::print_stack_on(outputStream* st) { | |
2946 if (!has_last_Java_frame()) return; | |
2947 ResourceMark rm; | |
2948 HandleMark hm; | |
2949 | |
2950 RegisterMap reg_map(this); | |
2951 vframe* start_vf = last_java_vframe(®_map); | |
2952 int count = 0; | |
2953 for (vframe* f = start_vf; f; f = f->sender() ) { | |
2954 if (f->is_java_frame()) { | |
2955 javaVFrame* jvf = javaVFrame::cast(f); | |
2956 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
2957 | |
2958 // Print out lock information | |
2959 if (JavaMonitorsInStackTrace) { | |
2960 jvf->print_lock_info_on(st, count); | |
2961 } | |
2962 } else { | |
2963 // Ignore non-Java frames | |
2964 } | |
2965 | |
2966 // Bail-out case for too deep stacks | |
2967 count++; | |
2968 if (MaxJavaStackTraceDepth == count) return; | |
2969 } | |
2970 } | |
2971 | |
2972 | |
2973 // JVMTI PopFrame support | |
2974 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
2975 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
2976 if (in_bytes(size_in_bytes) != 0) { | |
6197 | 2977 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes), mtThread); |
0 | 2978 _popframe_preserved_args_size = in_bytes(size_in_bytes); |
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2979 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
0 | 2980 } |
2981 } | |
2982 | |
2983 void* JavaThread::popframe_preserved_args() { | |
2984 return _popframe_preserved_args; | |
2985 } | |
2986 | |
2987 ByteSize JavaThread::popframe_preserved_args_size() { | |
2988 return in_ByteSize(_popframe_preserved_args_size); | |
2989 } | |
2990 | |
2991 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
2992 int sz = in_bytes(popframe_preserved_args_size()); | |
2993 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
2994 return in_WordSize(sz / wordSize); | |
2995 } | |
2996 | |
2997 void JavaThread::popframe_free_preserved_args() { | |
2998 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
6197 | 2999 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args, mtThread); |
0 | 3000 _popframe_preserved_args = NULL; |
3001 _popframe_preserved_args_size = 0; | |
3002 } | |
3003 | |
3004 #ifndef PRODUCT | |
3005 | |
3006 void JavaThread::trace_frames() { | |
3007 tty->print_cr("[Describe stack]"); | |
3008 int frame_no = 1; | |
3009 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
3010 tty->print(" %d. ", frame_no++); | |
3011 fst.current()->print_value_on(tty,this); | |
3012 tty->cr(); | |
3013 } | |
3014 } | |
3015 | |
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3016 class PrintAndVerifyOopClosure: public OopClosure { |
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3017 protected: |
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3018 template <class T> inline void do_oop_work(T* p) { |
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3019 oop obj = oopDesc::load_decode_heap_oop(p); |
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3020 if (obj == NULL) return; |
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3021 tty->print(INTPTR_FORMAT ": ", p); |
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3022 if (obj->is_oop_or_null()) { |
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3023 if (obj->is_objArray()) { |
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3024 tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj); |
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3025 } else { |
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3026 obj->print(); |
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3027 } |
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3028 } else { |
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3029 tty->print_cr("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj); |
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|
3030 } |
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3031 tty->cr(); |
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|
3032 } |
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|
3033 public: |
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|
3034 virtual void do_oop(oop* p) { do_oop_work(p); } |
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3035 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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|
3036 }; |
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3037 |
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3038 |
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3039 static void oops_print(frame* f, const RegisterMap *map) { |
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3040 PrintAndVerifyOopClosure print; |
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3041 f->print_value(); |
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3042 f->oops_do(&print, NULL, (RegisterMap*)map); |
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|
3043 } |
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3044 |
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3045 // Print our all the locations that contain oops and whether they are |
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3046 // valid or not. This useful when trying to find the oldest frame |
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3047 // where an oop has gone bad since the frame walk is from youngest to |
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|
3048 // oldest. |
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3049 void JavaThread::trace_oops() { |
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|
3050 tty->print_cr("[Trace oops]"); |
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|
3051 frames_do(oops_print); |
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|
3052 } |
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3053 |
0 | 3054 |
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3055 #ifdef ASSERT |
3336
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3056 // Print or validate the layout of stack frames |
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3057 void JavaThread::print_frame_layout(int depth, bool validate_only) { |
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3058 ResourceMark rm; |
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3059 PRESERVE_EXCEPTION_MARK; |
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3060 FrameValues values; |
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3061 int frame_no = 0; |
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3062 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) { |
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3063 fst.current()->describe(values, ++frame_no); |
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3064 if (depth == frame_no) break; |
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3065 } |
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3066 if (validate_only) { |
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3067 values.validate(); |
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3068 } else { |
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3069 tty->print_cr("[Describe stack layout]"); |
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3070 values.print(this); |
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3071 } |
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3072 } |
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3073 #endif |
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3074 |
0 | 3075 void JavaThread::trace_stack_from(vframe* start_vf) { |
3076 ResourceMark rm; | |
3077 int vframe_no = 1; | |
3078 for (vframe* f = start_vf; f; f = f->sender() ) { | |
3079 if (f->is_java_frame()) { | |
3080 javaVFrame::cast(f)->print_activation(vframe_no++); | |
3081 } else { | |
3082 f->print(); | |
3083 } | |
3084 if (vframe_no > StackPrintLimit) { | |
3085 tty->print_cr("...<more frames>..."); | |
3086 return; | |
3087 } | |
3088 } | |
3089 } | |
3090 | |
3091 | |
3092 void JavaThread::trace_stack() { | |
3093 if (!has_last_Java_frame()) return; | |
3094 ResourceMark rm; | |
3095 HandleMark hm; | |
3096 RegisterMap reg_map(this); | |
3097 trace_stack_from(last_java_vframe(®_map)); | |
3098 } | |
3099 | |
3100 | |
3101 #endif // PRODUCT | |
3102 | |
3103 | |
3104 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
3105 assert(reg_map != NULL, "a map must be given"); | |
3106 frame f = last_frame(); | |
3107 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
3108 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
3109 } | |
3110 return NULL; | |
3111 } | |
3112 | |
3113 | |
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3114 Klass* JavaThread::security_get_caller_class(int depth) { |
0 | 3115 vframeStream vfst(this); |
3116 vfst.security_get_caller_frame(depth); | |
3117 if (!vfst.at_end()) { | |
3118 return vfst.method()->method_holder(); | |
3119 } | |
3120 return NULL; | |
3121 } | |
3122 | |
3123 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
3124 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
3125 CompileBroker::compiler_thread_loop(); | |
3126 } | |
3127 | |
3128 // Create a CompilerThread | |
3129 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
3130 : JavaThread(&compiler_thread_entry) { | |
3131 _env = NULL; | |
3132 _log = NULL; | |
3133 _task = NULL; | |
3134 _queue = queue; | |
3135 _counters = counters; | |
1584 | 3136 _buffer_blob = NULL; |
3384
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3137 _scanned_nmethod = NULL; |
0 | 3138 |
3139 #ifndef PRODUCT | |
3140 _ideal_graph_printer = NULL; | |
3141 #endif | |
3142 } | |
3143 | |
3384
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3144 void CompilerThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
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3145 JavaThread::oops_do(f, cf); |
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|
3146 if (_scanned_nmethod != NULL && cf != NULL) { |
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|
3147 // Safepoints can occur when the sweeper is scanning an nmethod so |
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|
3148 // process it here to make sure it isn't unloaded in the middle of |
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|
3149 // a scan. |
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|
3150 cf->do_code_blob(_scanned_nmethod); |
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|
3151 } |
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|
3152 } |
0 | 3153 |
3154 // ======= Threads ======== | |
3155 | |
3156 // The Threads class links together all active threads, and provides | |
3157 // operations over all threads. It is protected by its own Mutex | |
3158 // lock, which is also used in other contexts to protect thread | |
3159 // operations from having the thread being operated on from exiting | |
3160 // and going away unexpectedly (e.g., safepoint synchronization) | |
3161 | |
3162 JavaThread* Threads::_thread_list = NULL; | |
3163 int Threads::_number_of_threads = 0; | |
3164 int Threads::_number_of_non_daemon_threads = 0; | |
3165 int Threads::_return_code = 0; | |
3166 size_t JavaThread::_stack_size_at_create = 0; | |
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3167 #ifdef ASSERT |
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3168 bool Threads::_vm_complete = false; |
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3169 #endif |
0 | 3170 |
3171 // All JavaThreads | |
3172 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
3173 | |
3174 void os_stream(); | |
3175 | |
3176 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
3177 void Threads::threads_do(ThreadClosure* tc) { | |
3178 assert_locked_or_safepoint(Threads_lock); | |
3179 // ALL_JAVA_THREADS iterates through all JavaThreads | |
3180 ALL_JAVA_THREADS(p) { | |
3181 tc->do_thread(p); | |
3182 } | |
3183 // Someday we could have a table or list of all non-JavaThreads. | |
3184 // For now, just manually iterate through them. | |
3185 tc->do_thread(VMThread::vm_thread()); | |
3186 Universe::heap()->gc_threads_do(tc); | |
323
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3187 WatcherThread *wt = WatcherThread::watcher_thread(); |
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3188 // Strictly speaking, the following NULL check isn't sufficient to make sure |
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3189 // the data for WatcherThread is still valid upon being examined. However, |
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3190 // considering that WatchThread terminates when the VM is on the way to |
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3191 // exit at safepoint, the chance of the above is extremely small. The right |
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|
3192 // way to prevent termination of WatcherThread would be to acquire |
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|
3193 // Terminator_lock, but we can't do that without violating the lock rank |
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3194 // checking in some cases. |
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3195 if (wt != NULL) |
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3196 tc->do_thread(wt); |
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|
3197 |
0 | 3198 // If CompilerThreads ever become non-JavaThreads, add them here |
3199 } | |
3200 | |
3201 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
3202 | |
242 | 3203 extern void JDK_Version_init(); |
3204 | |
0 | 3205 // Check version |
3206 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
3207 | |
3208 // Initialize the output stream module | |
3209 ostream_init(); | |
3210 | |
3211 // Process java launcher properties. | |
3212 Arguments::process_sun_java_launcher_properties(args); | |
3213 | |
3214 // Initialize the os module before using TLS | |
3215 os::init(); | |
3216 | |
3217 // Initialize system properties. | |
3218 Arguments::init_system_properties(); | |
3219 | |
242 | 3220 // So that JDK version can be used as a discrimintor when parsing arguments |
3221 JDK_Version_init(); | |
3222 | |
1864
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6988363: Rebrand vm vendor property settings (jdk7 only)
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|
3223 // Update/Initialize System properties after JDK version number is known |
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6988363: Rebrand vm vendor property settings (jdk7 only)
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|
3224 Arguments::init_version_specific_system_properties(); |
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|
3225 |
0 | 3226 // Parse arguments |
3227 jint parse_result = Arguments::parse(args); | |
3228 if (parse_result != JNI_OK) return parse_result; | |
3229 | |
3230 if (PauseAtStartup) { | |
3231 os::pause(); | |
3232 } | |
3233 | |
4006 | 3234 #ifndef USDT2 |
0 | 3235 HS_DTRACE_PROBE(hotspot, vm__init__begin); |
4006 | 3236 #else /* USDT2 */ |
3237 HOTSPOT_VM_INIT_BEGIN(); | |
3238 #endif /* USDT2 */ | |
0 | 3239 |
3240 // Record VM creation timing statistics | |
3241 TraceVmCreationTime create_vm_timer; | |
3242 create_vm_timer.start(); | |
3243 | |
3244 // Timing (must come after argument parsing) | |
3245 TraceTime timer("Create VM", TraceStartupTime); | |
3246 | |
3247 // Initialize the os module after parsing the args | |
3248 jint os_init_2_result = os::init_2(); | |
3249 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
3250 | |
6197 | 3251 // intialize TLS |
3252 ThreadLocalStorage::init(); | |
3253 | |
3254 // Bootstrap native memory tracking, so it can start recording memory | |
3255 // activities before worker thread is started. This is the first phase | |
3256 // of bootstrapping, VM is currently running in single-thread mode. | |
3257 MemTracker::bootstrap_single_thread(); | |
3258 | |
0 | 3259 // Initialize output stream logging |
3260 ostream_init_log(); | |
3261 | |
3262 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
3263 // Must be before create_vm_init_agents() | |
3264 if (Arguments::init_libraries_at_startup()) { | |
3265 convert_vm_init_libraries_to_agents(); | |
3266 } | |
3267 | |
3268 // Launch -agentlib/-agentpath and converted -Xrun agents | |
3269 if (Arguments::init_agents_at_startup()) { | |
3270 create_vm_init_agents(); | |
3271 } | |
3272 | |
3273 // Initialize Threads state | |
3274 _thread_list = NULL; | |
3275 _number_of_threads = 0; | |
3276 _number_of_non_daemon_threads = 0; | |
3277 | |
3278 // Initialize global data structures and create system classes in heap | |
3279 vm_init_globals(); | |
3280 | |
3281 // Attach the main thread to this os thread | |
3282 JavaThread* main_thread = new JavaThread(); | |
3283 main_thread->set_thread_state(_thread_in_vm); | |
3284 // must do this before set_active_handles and initialize_thread_local_storage | |
3285 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
3286 // change the stack size recorded here to one based on the java thread | |
3287 // stacksize. This adjusted size is what is used to figure the placement | |
3288 // of the guard pages. | |
3289 main_thread->record_stack_base_and_size(); | |
3290 main_thread->initialize_thread_local_storage(); | |
3291 | |
3292 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
3293 | |
3294 if (!main_thread->set_as_starting_thread()) { | |
3295 vm_shutdown_during_initialization( | |
3296 "Failed necessary internal allocation. Out of swap space"); | |
3297 delete main_thread; | |
3298 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3299 return JNI_ENOMEM; | |
3300 } | |
3301 | |
3302 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
3303 // crash Linux VM, see notes in os_linux.cpp. | |
3304 main_thread->create_stack_guard_pages(); | |
3305 | |
1878 | 3306 // Initialize Java-Level synchronization subsystem |
3307 ObjectMonitor::Initialize() ; | |
0 | 3308 |
6197 | 3309 // Second phase of bootstrapping, VM is about entering multi-thread mode |
3310 MemTracker::bootstrap_multi_thread(); | |
3311 | |
0 | 3312 // Initialize global modules |
3313 jint status = init_globals(); | |
3314 if (status != JNI_OK) { | |
3315 delete main_thread; | |
3316 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3317 return status; | |
3318 } | |
3319 | |
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|
3320 // Should be done after the heap is fully created |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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|
3321 main_thread->cache_global_variables(); |
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|
3322 |
0 | 3323 HandleMark hm; |
3324 | |
3325 { MutexLocker mu(Threads_lock); | |
3326 Threads::add(main_thread); | |
3327 } | |
3328 | |
3329 // Any JVMTI raw monitors entered in onload will transition into | |
3330 // real raw monitor. VM is setup enough here for raw monitor enter. | |
3331 JvmtiExport::transition_pending_onload_raw_monitors(); | |
3332 | |
3333 if (VerifyBeforeGC && | |
3334 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
3335 Universe::heap()->prepare_for_verify(); | |
3336 Universe::verify(); // make sure we're starting with a clean slate | |
3337 } | |
3338 | |
6197 | 3339 // Fully start NMT |
3340 MemTracker::start(); | |
3341 | |
0 | 3342 // Create the VMThread |
3343 { TraceTime timer("Start VMThread", TraceStartupTime); | |
3344 VMThread::create(); | |
3345 Thread* vmthread = VMThread::vm_thread(); | |
3346 | |
3347 if (!os::create_thread(vmthread, os::vm_thread)) | |
3348 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
3349 | |
3350 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
3351 // Monitors can have spurious returns, must always check another state flag | |
3352 { | |
3353 MutexLocker ml(Notify_lock); | |
3354 os::start_thread(vmthread); | |
3355 while (vmthread->active_handles() == NULL) { | |
3356 Notify_lock->wait(); | |
3357 } | |
3358 } | |
3359 } | |
3360 | |
3361 assert (Universe::is_fully_initialized(), "not initialized"); | |
3362 EXCEPTION_MARK; | |
3363 | |
3364 // At this point, the Universe is initialized, but we have not executed | |
3365 // any byte code. Now is a good time (the only time) to dump out the | |
3366 // internal state of the JVM for sharing. | |
3367 if (DumpSharedSpaces) { | |
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3368 MetaspaceShared::preload_and_dump(CHECK_0); |
0 | 3369 ShouldNotReachHere(); |
3370 } | |
3371 | |
3372 // Always call even when there are not JVMTI environments yet, since environments | |
3373 // may be attached late and JVMTI must track phases of VM execution | |
3374 JvmtiExport::enter_start_phase(); | |
3375 | |
3376 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
3377 JvmtiExport::post_vm_start(); | |
3378 | |
3379 { | |
3380 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
3381 | |
3382 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3383 create_vm_init_libraries(); | |
3384 } | |
3385 | |
3386 if (InitializeJavaLangString) { | |
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2162
diff
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|
3387 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
0 | 3388 } else { |
3389 warning("java.lang.String not initialized"); | |
3390 } | |
3391 | |
18
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|
3392 if (AggressiveOpts) { |
192
6d13fcb3663f
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|
3393 { |
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3394 // Forcibly initialize java/util/HashMap and mutate the private |
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6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
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diff
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|
3395 // static final "frontCacheEnabled" field before we start creating instances |
18
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|
3396 #ifdef ASSERT |
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|
3397 Klass* tmp_k = SystemDictionary::find(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
192
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3398 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
18
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|
3399 #endif |
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changeset
|
3400 Klass* k_o = SystemDictionary::resolve_or_null(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
192
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|
3401 KlassHandle k = KlassHandle(THREAD, k_o); |
6d13fcb3663f
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diff
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|
3402 guarantee(k.not_null(), "Must find java/util/HashMap"); |
6d13fcb3663f
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kvn
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diff
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|
3403 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
6d13fcb3663f
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kvn
parents:
62
diff
changeset
|
3404 ik->initialize(CHECK_0); |
6d13fcb3663f
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kvn
parents:
62
diff
changeset
|
3405 fieldDescriptor fd; |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3406 // Possible we might not find this field; if so, don't break |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
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62
diff
changeset
|
3407 if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
2376
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
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diff
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|
3408 k()->java_mirror()->bool_field_put(fd.offset(), true); |
192
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diff
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|
3409 } |
6d13fcb3663f
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kvn
parents:
62
diff
changeset
|
3410 } |
6d13fcb3663f
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kvn
parents:
62
diff
changeset
|
3411 |
6d13fcb3663f
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kvn
parents:
62
diff
changeset
|
3412 if (UseStringCache) { |
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
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441
diff
changeset
|
3413 // Forcibly initialize java/lang/StringValue and mutate the private |
192
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
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diff
changeset
|
3414 // static final "stringCacheEnabled" field before we start creating instances |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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6198
diff
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|
3415 Klass* k_o = SystemDictionary::resolve_or_null(vmSymbols::java_lang_StringValue(), Handle(), Handle(), CHECK_0); |
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3416 // Possible that StringValue isn't present: if so, silently don't break |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3417 if (k_o != NULL) { |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
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441
diff
changeset
|
3418 KlassHandle k = KlassHandle(THREAD, k_o); |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
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441
diff
changeset
|
3419 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3420 ik->initialize(CHECK_0); |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3421 fieldDescriptor fd; |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3422 // Possible we might not find this field: if so, silently don't break |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3423 if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
2376
c7f3d0b4570f
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parents:
2302
diff
changeset
|
3424 k()->java_mirror()->bool_field_put(fd.offset(), true); |
669
eca19a8425b5
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diff
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|
3425 } |
192
6d13fcb3663f
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diff
changeset
|
3426 } |
18
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3427 } |
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3428 } |
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3429 |
0 | 3430 // Initialize java_lang.System (needed before creating the thread) |
3431 if (InitializeJavaLangSystem) { | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3432 initialize_class(vmSymbols::java_lang_System(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3433 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); |
0 | 3434 Handle thread_group = create_initial_thread_group(CHECK_0); |
3435 Universe::set_main_thread_group(thread_group()); | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3436 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); |
0 | 3437 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); |
3438 main_thread->set_threadObj(thread_object); | |
3439 // Set thread status to running since main thread has | |
3440 // been started and running. | |
3441 java_lang_Thread::set_thread_status(thread_object, | |
3442 java_lang_Thread::RUNNABLE); | |
3443 | |
3444 // The VM preresolve methods to these classes. Make sure that get initialized | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3445 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3446 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); |
0 | 3447 // The VM creates & returns objects of this class. Make sure it's initialized. |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3448 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); |
0 | 3449 call_initializeSystemClass(CHECK_0); |
6181 | 3450 |
3451 // get the Java runtime name after java.lang.System is initialized | |
3452 JDK_Version::set_runtime_name(get_java_runtime_name(THREAD)); | |
0 | 3453 } else { |
3454 warning("java.lang.System not initialized"); | |
3455 } | |
3456 | |
3457 // an instance of OutOfMemory exception has been allocated earlier | |
3458 if (InitializeJavaLangExceptionsErrors) { | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3459 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3460 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3461 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3462 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3463 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3464 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3465 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); |
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3466 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK_0); |
0 | 3467 } else { |
3468 warning("java.lang.OutOfMemoryError has not been initialized"); | |
3469 warning("java.lang.NullPointerException has not been initialized"); | |
3470 warning("java.lang.ClassCastException has not been initialized"); | |
3471 warning("java.lang.ArrayStoreException has not been initialized"); | |
3472 warning("java.lang.ArithmeticException has not been initialized"); | |
3473 warning("java.lang.StackOverflowError has not been initialized"); | |
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3474 warning("java.lang.IllegalArgumentException has not been initialized"); |
0 | 3475 } |
2416
38fea01eb669
6817525: turn on method handle functionality by default for JSR 292
twisti
parents:
2376
diff
changeset
|
3476 } |
0 | 3477 |
3478 // See : bugid 4211085. | |
3479 // Background : the static initializer of java.lang.Compiler tries to read | |
3480 // property"java.compiler" and read & write property "java.vm.info". | |
3481 // When a security manager is installed through the command line | |
3482 // option "-Djava.security.manager", the above properties are not | |
3483 // readable and the static initializer for java.lang.Compiler fails | |
3484 // resulting in a NoClassDefFoundError. This can happen in any | |
3485 // user code which calls methods in java.lang.Compiler. | |
3486 // Hack : the hack is to pre-load and initialize this class, so that only | |
3487 // system domains are on the stack when the properties are read. | |
3488 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
3489 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
3490 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
3491 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
3492 // Once that is done, we should remove this hack. | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3493 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
0 | 3494 |
3495 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
3496 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
3497 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
3498 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
3499 // This should also be taken out as soon as 4211383 gets fixed. | |
3500 reset_vm_info_property(CHECK_0); | |
3501 | |
3502 quicken_jni_functions(); | |
3503 | |
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3504 // Must be run after init_ft which initializes ft_enabled |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3505 if (TRACE_INITIALIZE() != JNI_OK) { |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3506 vm_exit_during_initialization("Failed to initialize tracing backend"); |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3507 } |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3508 |
0 | 3509 // Set flag that basic initialization has completed. Used by exceptions and various |
3510 // debug stuff, that does not work until all basic classes have been initialized. | |
3511 set_init_completed(); | |
3512 | |
4006 | 3513 #ifndef USDT2 |
0 | 3514 HS_DTRACE_PROBE(hotspot, vm__init__end); |
4006 | 3515 #else /* USDT2 */ |
3516 HOTSPOT_VM_INIT_END(); | |
3517 #endif /* USDT2 */ | |
0 | 3518 |
3519 // record VM initialization completion time | |
3520 Management::record_vm_init_completed(); | |
3521 | |
3522 // Compute system loader. Note that this has to occur after set_init_completed, since | |
3523 // valid exceptions may be thrown in the process. | |
3524 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
3525 // set_init_completed has just been called, causing exceptions not to be shortcut | |
3526 // anymore. We call vm_exit_during_initialization directly instead. | |
3527 SystemDictionary::compute_java_system_loader(THREAD); | |
3528 if (HAS_PENDING_EXCEPTION) { | |
3529 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3530 } | |
3531 | |
3532 #ifndef SERIALGC | |
3533 // Support for ConcurrentMarkSweep. This should be cleaned up | |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3534 // and better encapsulated. The ugly nested if test would go away |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3535 // once things are properly refactored. XXX YSR |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3536 if (UseConcMarkSweepGC || UseG1GC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3537 if (UseConcMarkSweepGC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3538 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3539 } else { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3540 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3541 } |
0 | 3542 if (HAS_PENDING_EXCEPTION) { |
3543 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3544 } | |
3545 } | |
3546 #endif // SERIALGC | |
3547 | |
3548 // Always call even when there are not JVMTI environments yet, since environments | |
3549 // may be attached late and JVMTI must track phases of VM execution | |
3550 JvmtiExport::enter_live_phase(); | |
3551 | |
3552 // Signal Dispatcher needs to be started before VMInit event is posted | |
3553 os::signal_init(); | |
3554 | |
3555 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
3556 if (!DisableAttachMechanism) { | |
3557 if (StartAttachListener || AttachListener::init_at_startup()) { | |
3558 AttachListener::init(); | |
3559 } | |
3560 } | |
3561 | |
3562 // Launch -Xrun agents | |
3563 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
3564 // back-end can launch with -Xdebug -Xrunjdwp. | |
3565 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3566 create_vm_init_libraries(); | |
3567 } | |
3568 | |
6002
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3569 // Notify JVMTI agents that VM initialization is complete - nop if no agents. |
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3570 JvmtiExport::post_vm_initialized(); |
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3571 |
4800
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3572 if (!TRACE_START()) { |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3573 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3574 } |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3575 |
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3576 if (CleanChunkPoolAsync) { |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3577 Chunk::start_chunk_pool_cleaner_task(); |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3578 } |
0 | 3579 |
3580 // initialize compiler(s) | |
3581 CompileBroker::compilation_init(); | |
3582 | |
3583 Management::initialize(THREAD); | |
3584 if (HAS_PENDING_EXCEPTION) { | |
3585 // management agent fails to start possibly due to | |
3586 // configuration problem and is responsible for printing | |
3587 // stack trace if appropriate. Simply exit VM. | |
3588 vm_exit(1); | |
3589 } | |
3590 | |
3591 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
3592 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
3593 if (MemProfiling) MemProfiler::engage(); | |
3594 StatSampler::engage(); | |
3595 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
3596 | |
3597 BiasedLocking::init(); | |
3598 | |
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3599 if (JDK_Version::current().post_vm_init_hook_enabled()) { |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3600 call_postVMInitHook(THREAD); |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3601 // The Java side of PostVMInitHook.run must deal with all |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3602 // exceptions and provide means of diagnosis. |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3603 if (HAS_PENDING_EXCEPTION) { |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3604 CLEAR_PENDING_EXCEPTION; |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3605 } |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3606 } |
0 | 3607 |
3608 // Start up the WatcherThread if there are any periodic tasks | |
3609 // NOTE: All PeriodicTasks should be registered by now. If they | |
3610 // aren't, late joiners might appear to start slowly (we might | |
3611 // take a while to process their first tick). | |
3612 if (PeriodicTask::num_tasks() > 0) { | |
3613 WatcherThread::start(); | |
3614 } | |
3615 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3616 // Give os specific code one last chance to start |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3617 os::init_3(); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3618 |
0 | 3619 create_vm_timer.end(); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3620 #ifdef ASSERT |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3621 _vm_complete = true; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3622 #endif |
0 | 3623 return JNI_OK; |
3624 } | |
3625 | |
3626 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
3627 extern "C" { | |
3628 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
3629 } | |
3630 // Find a command line agent library and return its entry point for | |
3631 // -agentlib: -agentpath: -Xrun | |
3632 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
3633 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
3634 OnLoadEntry_t on_load_entry = NULL; | |
3635 void *library = agent->os_lib(); // check if we have looked it up before | |
3636 | |
3637 if (library == NULL) { | |
3638 char buffer[JVM_MAXPATHLEN]; | |
3639 char ebuf[1024]; | |
3640 const char *name = agent->name(); | |
1694
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3641 const char *msg = "Could not find agent library "; |
0 | 3642 |
3643 if (agent->is_absolute_path()) { | |
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3644 library = os::dll_load(name, ebuf, sizeof ebuf); |
0 | 3645 if (library == NULL) { |
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3646 const char *sub_msg = " in absolute path, with error: "; |
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3647 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
6197 | 3648 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
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3649 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3650 // If we can't find the agent, exit. |
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3651 vm_exit_during_initialization(buf, NULL); |
6197 | 3652 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
0 | 3653 } |
3654 } else { | |
3655 // Try to load the agent from the standard dll directory | |
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3656 os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), name); |
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3657 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3658 #ifdef KERNEL |
3659 // Download instrument dll | |
3660 if (library == NULL && strcmp(name, "instrument") == 0) { | |
3661 char *props = Arguments::get_kernel_properties(); | |
3662 char *home = Arguments::get_java_home(); | |
3663 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
3664 " sun.jkernel.DownloadManager -download client_jvm"; | |
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3665 size_t length = strlen(props) + strlen(home) + strlen(fmt) + 1; |
6197 | 3666 char *cmd = NEW_C_HEAP_ARRAY(char, length, mtThread); |
0 | 3667 jio_snprintf(cmd, length, fmt, home, props); |
3668 int status = os::fork_and_exec(cmd); | |
3669 FreeHeap(props); | |
3670 if (status == -1) { | |
3671 warning(cmd); | |
3672 vm_exit_during_initialization("fork_and_exec failed: %s", | |
3673 strerror(errno)); | |
3674 } | |
6197 | 3675 FREE_C_HEAP_ARRAY(char, cmd, mtThread); |
0 | 3676 // when this comes back the instrument.dll should be where it belongs. |
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3677 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3678 } |
3679 #endif // KERNEL | |
3680 if (library == NULL) { // Try the local directory | |
3681 char ns[1] = {0}; | |
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3682 os::dll_build_name(buffer, sizeof(buffer), ns, name); |
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3683 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3684 if (library == NULL) { |
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3685 const char *sub_msg = " on the library path, with error: "; |
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3686 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
6197 | 3687 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
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3688 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3689 // If we can't find the agent, exit. |
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3690 vm_exit_during_initialization(buf, NULL); |
6197 | 3691 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
0 | 3692 } |
3693 } | |
3694 } | |
3695 agent->set_os_lib(library); | |
3696 } | |
3697 | |
3698 // Find the OnLoad function. | |
3699 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
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3700 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, os::dll_lookup(library, on_load_symbols[symbol_index])); |
0 | 3701 if (on_load_entry != NULL) break; |
3702 } | |
3703 return on_load_entry; | |
3704 } | |
3705 | |
3706 // Find the JVM_OnLoad entry point | |
3707 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
3708 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
3709 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3710 } | |
3711 | |
3712 // Find the Agent_OnLoad entry point | |
3713 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
3714 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
3715 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3716 } | |
3717 | |
3718 // For backwards compatibility with -Xrun | |
3719 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
3720 // treated like -agentpath: | |
3721 // Must be called before agent libraries are created | |
3722 void Threads::convert_vm_init_libraries_to_agents() { | |
3723 AgentLibrary* agent; | |
3724 AgentLibrary* next; | |
3725 | |
3726 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
3727 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
3728 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3729 | |
3730 // If there is an JVM_OnLoad function it will get called later, | |
3731 // otherwise see if there is an Agent_OnLoad | |
3732 if (on_load_entry == NULL) { | |
3733 on_load_entry = lookup_agent_on_load(agent); | |
3734 if (on_load_entry != NULL) { | |
3735 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
3736 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
3737 Arguments::convert_library_to_agent(agent); | |
3738 } else { | |
3739 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
3740 } | |
3741 } | |
3742 } | |
3743 } | |
3744 | |
3745 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
3746 // Invokes Agent_OnLoad | |
3747 // Called very early -- before JavaThreads exist | |
3748 void Threads::create_vm_init_agents() { | |
3749 extern struct JavaVM_ main_vm; | |
3750 AgentLibrary* agent; | |
3751 | |
3752 JvmtiExport::enter_onload_phase(); | |
3753 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3754 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
3755 | |
3756 if (on_load_entry != NULL) { | |
3757 // Invoke the Agent_OnLoad function | |
3758 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3759 if (err != JNI_OK) { | |
3760 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
3761 } | |
3762 } else { | |
3763 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
3764 } | |
3765 } | |
3766 JvmtiExport::enter_primordial_phase(); | |
3767 } | |
3768 | |
3769 extern "C" { | |
3770 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
3771 } | |
3772 | |
3773 void Threads::shutdown_vm_agents() { | |
3774 // Send any Agent_OnUnload notifications | |
3775 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
3776 extern struct JavaVM_ main_vm; | |
3777 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3778 | |
3779 // Find the Agent_OnUnload function. | |
3780 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
3781 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
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3782 os::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
0 | 3783 |
3784 // Invoke the Agent_OnUnload function | |
3785 if (unload_entry != NULL) { | |
3786 JavaThread* thread = JavaThread::current(); | |
3787 ThreadToNativeFromVM ttn(thread); | |
3788 HandleMark hm(thread); | |
3789 (*unload_entry)(&main_vm); | |
3790 break; | |
3791 } | |
3792 } | |
3793 } | |
3794 } | |
3795 | |
3796 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
3797 // Invokes JVM_OnLoad | |
3798 void Threads::create_vm_init_libraries() { | |
3799 extern struct JavaVM_ main_vm; | |
3800 AgentLibrary* agent; | |
3801 | |
3802 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
3803 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3804 | |
3805 if (on_load_entry != NULL) { | |
3806 // Invoke the JVM_OnLoad function | |
3807 JavaThread* thread = JavaThread::current(); | |
3808 ThreadToNativeFromVM ttn(thread); | |
3809 HandleMark hm(thread); | |
3810 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3811 if (err != JNI_OK) { | |
3812 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
3813 } | |
3814 } else { | |
3815 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
3816 } | |
3817 } | |
3818 } | |
3819 | |
3820 // Last thread running calls java.lang.Shutdown.shutdown() | |
3821 void JavaThread::invoke_shutdown_hooks() { | |
3822 HandleMark hm(this); | |
3823 | |
3824 // We could get here with a pending exception, if so clear it now. | |
3825 if (this->has_pending_exception()) { | |
3826 this->clear_pending_exception(); | |
3827 } | |
3828 | |
3829 EXCEPTION_MARK; | |
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3830 Klass* k = |
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3831 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
0 | 3832 THREAD); |
3833 if (k != NULL) { | |
3834 // SystemDictionary::resolve_or_null will return null if there was | |
3835 // an exception. If we cannot load the Shutdown class, just don't | |
3836 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
3837 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
3838 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
3839 // was called, the Shutdown class would have already been loaded | |
3840 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
3841 instanceKlassHandle shutdown_klass (THREAD, k); | |
3842 JavaValue result(T_VOID); | |
3843 JavaCalls::call_static(&result, | |
3844 shutdown_klass, | |
2177
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3845 vmSymbols::shutdown_method_name(), |
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|
3846 vmSymbols::void_method_signature(), |
0 | 3847 THREAD); |
3848 } | |
3849 CLEAR_PENDING_EXCEPTION; | |
3850 } | |
3851 | |
3852 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
3853 // the program falls off the end of main(). Another VM exit path is through | |
3854 // vm_exit() when the program calls System.exit() to return a value or when | |
3855 // there is a serious error in VM. The two shutdown paths are not exactly | |
3856 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
3857 // and VM_Exit op at VM level. | |
3858 // | |
3859 // Shutdown sequence: | |
6197 | 3860 // + Shutdown native memory tracking if it is on |
0 | 3861 // + Wait until we are the last non-daemon thread to execute |
3862 // <-- every thing is still working at this moment --> | |
3863 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
3864 // shutdown hooks, run finalizers if finalization-on-exit | |
3865 // + Call before_exit(), prepare for VM exit | |
3866 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
3867 // currently the only user of this mechanism is File.deleteOnExit()) | |
3868 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
3869 // post thread end and vm death events to JVMTI, | |
3870 // stop signal thread | |
3871 // + Call JavaThread::exit(), it will: | |
3872 // > release JNI handle blocks, remove stack guard pages | |
3873 // > remove this thread from Threads list | |
3874 // <-- no more Java code from this thread after this point --> | |
3875 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
3876 // the compiler threads at safepoint | |
3877 // <-- do not use anything that could get blocked by Safepoint --> | |
3878 // + Disable tracing at JNI/JVM barriers | |
3879 // + Set _vm_exited flag for threads that are still running native code | |
3880 // + Delete this thread | |
3881 // + Call exit_globals() | |
3882 // > deletes tty | |
3883 // > deletes PerfMemory resources | |
3884 // + Return to caller | |
3885 | |
3886 bool Threads::destroy_vm() { | |
3887 JavaThread* thread = JavaThread::current(); | |
3888 | |
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3889 #ifdef ASSERT |
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3890 _vm_complete = false; |
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3891 #endif |
0 | 3892 // Wait until we are the last non-daemon thread to execute |
3893 { MutexLocker nu(Threads_lock); | |
3894 while (Threads::number_of_non_daemon_threads() > 1 ) | |
3895 // This wait should make safepoint checks, wait without a timeout, | |
3896 // and wait as a suspend-equivalent condition. | |
3897 // | |
3898 // Note: If the FlatProfiler is running and this thread is waiting | |
3899 // for another non-daemon thread to finish, then the FlatProfiler | |
3900 // is waiting for the external suspend request on this thread to | |
3901 // complete. wait_for_ext_suspend_completion() will eventually | |
3902 // timeout, but that takes time. Making this wait a suspend- | |
3903 // equivalent condition solves that timeout problem. | |
3904 // | |
3905 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
3906 Mutex::_as_suspend_equivalent_flag); | |
3907 } | |
3908 | |
6197 | 3909 // Shutdown NMT before exit. Otherwise, |
3910 // it will run into trouble when system destroys static variables. | |
3911 MemTracker::shutdown(MemTracker::NMT_normal); | |
3912 | |
0 | 3913 // Hang forever on exit if we are reporting an error. |
3914 if (ShowMessageBoxOnError && is_error_reported()) { | |
3915 os::infinite_sleep(); | |
3916 } | |
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3917 os::wait_for_keypress_at_exit(); |
0 | 3918 |
3919 if (JDK_Version::is_jdk12x_version()) { | |
3920 // We are the last thread running, so check if finalizers should be run. | |
3921 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
3922 HandleMark rm(thread); | |
3923 Universe::run_finalizers_on_exit(); | |
3924 } else { | |
3925 // run Java level shutdown hooks | |
3926 thread->invoke_shutdown_hooks(); | |
3927 } | |
3928 | |
3929 before_exit(thread); | |
3930 | |
3931 thread->exit(true); | |
3932 | |
3933 // Stop VM thread. | |
3934 { | |
3935 // 4945125 The vm thread comes to a safepoint during exit. | |
3936 // GC vm_operations can get caught at the safepoint, and the | |
3937 // heap is unparseable if they are caught. Grab the Heap_lock | |
3938 // to prevent this. The GC vm_operations will not be able to | |
3939 // queue until after the vm thread is dead. | |
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3940 // After this point, we'll never emerge out of the safepoint before |
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3941 // the VM exits, so concurrent GC threads do not need to be explicitly |
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3942 // stopped; they remain inactive until the process exits. |
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7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
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3943 // Note: some concurrent G1 threads may be running during a safepoint, |
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3944 // but these will not be accessing the heap, just some G1-specific side |
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3945 // data structures that are not accessed by any other threads but them |
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3946 // after this point in a terminal safepoint. |
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3947 |
0 | 3948 MutexLocker ml(Heap_lock); |
3949 | |
3950 VMThread::wait_for_vm_thread_exit(); | |
3951 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
3952 VMThread::destroy(); | |
3953 } | |
3954 | |
3955 // clean up ideal graph printers | |
3956 #if defined(COMPILER2) && !defined(PRODUCT) | |
3957 IdealGraphPrinter::clean_up(); | |
3958 #endif | |
3959 | |
3960 // Now, all Java threads are gone except daemon threads. Daemon threads | |
3961 // running Java code or in VM are stopped by the Safepoint. However, | |
3962 // daemon threads executing native code are still running. But they | |
3963 // will be stopped at native=>Java/VM barriers. Note that we can't | |
3964 // simply kill or suspend them, as it is inherently deadlock-prone. | |
3965 | |
3966 #ifndef PRODUCT | |
3967 // disable function tracing at JNI/JVM barriers | |
3968 TraceJNICalls = false; | |
3969 TraceJVMCalls = false; | |
3970 TraceRuntimeCalls = false; | |
3971 #endif | |
3972 | |
3973 VM_Exit::set_vm_exited(); | |
3974 | |
3975 notify_vm_shutdown(); | |
3976 | |
3977 delete thread; | |
3978 | |
3979 // exit_globals() will delete tty | |
3980 exit_globals(); | |
3981 | |
3982 return true; | |
3983 } | |
3984 | |
3985 | |
3986 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
3987 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
3988 return is_supported_jni_version(version); | |
3989 } | |
3990 | |
3991 | |
3992 jboolean Threads::is_supported_jni_version(jint version) { | |
3993 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
3994 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
3995 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
3996 return JNI_FALSE; | |
3997 } | |
3998 | |
3999 | |
4000 void Threads::add(JavaThread* p, bool force_daemon) { | |
4001 // The threads lock must be owned at this point | |
4002 assert_locked_or_safepoint(Threads_lock); | |
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4003 |
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4004 // See the comment for this method in thread.hpp for its purpose and |
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4005 // why it is called here. |
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4006 p->initialize_queues(); |
0 | 4007 p->set_next(_thread_list); |
4008 _thread_list = p; | |
4009 _number_of_threads++; | |
4010 oop threadObj = p->threadObj(); | |
4011 bool daemon = true; | |
4012 // Bootstrapping problem: threadObj can be null for initial | |
4013 // JavaThread (or for threads attached via JNI) | |
4014 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
4015 _number_of_non_daemon_threads++; | |
4016 daemon = false; | |
4017 } | |
4018 | |
6197 | 4019 p->set_safepoint_visible(true); |
4020 | |
0 | 4021 ThreadService::add_thread(p, daemon); |
4022 | |
4023 // Possible GC point. | |
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4024 Events::log(p, "Thread added: " INTPTR_FORMAT, p); |
0 | 4025 } |
4026 | |
4027 void Threads::remove(JavaThread* p) { | |
4028 // Extra scope needed for Thread_lock, so we can check | |
4029 // that we do not remove thread without safepoint code notice | |
4030 { MutexLocker ml(Threads_lock); | |
4031 | |
4032 assert(includes(p), "p must be present"); | |
4033 | |
4034 JavaThread* current = _thread_list; | |
4035 JavaThread* prev = NULL; | |
4036 | |
4037 while (current != p) { | |
4038 prev = current; | |
4039 current = current->next(); | |
4040 } | |
4041 | |
4042 if (prev) { | |
4043 prev->set_next(current->next()); | |
4044 } else { | |
4045 _thread_list = p->next(); | |
4046 } | |
4047 _number_of_threads--; | |
4048 oop threadObj = p->threadObj(); | |
4049 bool daemon = true; | |
4050 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
4051 _number_of_non_daemon_threads--; | |
4052 daemon = false; | |
4053 | |
4054 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
4055 // on destroy_vm will wake up. | |
4056 if (number_of_non_daemon_threads() == 1) | |
4057 Threads_lock->notify_all(); | |
4058 } | |
4059 ThreadService::remove_thread(p, daemon); | |
4060 | |
4061 // Make sure that safepoint code disregard this thread. This is needed since | |
4062 // the thread might mess around with locks after this point. This can cause it | |
4063 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
4064 // of this thread since it is removed from the queue. | |
4065 p->set_terminated_value(); | |
6197 | 4066 |
4067 // Now, this thread is not visible to safepoint | |
4068 p->set_safepoint_visible(false); | |
4069 | |
0 | 4070 } // unlock Threads_lock |
4071 | |
4072 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
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4073 Events::log(p, "Thread exited: " INTPTR_FORMAT, p); |
0 | 4074 } |
4075 | |
4076 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
4077 bool Threads::includes(JavaThread* p) { | |
4078 assert(Threads_lock->is_locked(), "sanity check"); | |
4079 ALL_JAVA_THREADS(q) { | |
4080 if (q == p ) { | |
4081 return true; | |
4082 } | |
4083 } | |
4084 return false; | |
4085 } | |
4086 | |
4087 // Operations on the Threads list for GC. These are not explicitly locked, | |
4088 // but the garbage collector must provide a safe context for them to run. | |
4089 // In particular, these things should never be called when the Threads_lock | |
4090 // is held by some other thread. (Note: the Safepoint abstraction also | |
4091 // uses the Threads_lock to gurantee this property. It also makes sure that | |
4092 // all threads gets blocked when exiting or starting). | |
4093 | |
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4094 void Threads::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 4095 ALL_JAVA_THREADS(p) { |
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4096 p->oops_do(f, cf); |
0 | 4097 } |
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4098 VMThread::vm_thread()->oops_do(f, cf); |
0 | 4099 } |
4100 | |
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4101 void Threads::possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 4102 // Introduce a mechanism allowing parallel threads to claim threads as |
4103 // root groups. Overhead should be small enough to use all the time, | |
4104 // even in sequential code. | |
4105 SharedHeap* sh = SharedHeap::heap(); | |
4095
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4106 // Cannot yet substitute active_workers for n_par_threads |
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4107 // because of G1CollectedHeap::verify() use of |
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4108 // SharedHeap::process_strong_roots(). n_par_threads == 0 will |
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4109 // turn off parallelism in process_strong_roots while active_workers |
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4110 // is being used for parallelism elsewhere. |
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4111 bool is_par = sh->n_par_threads() > 0; |
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4112 assert(!is_par || |
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4113 (SharedHeap::heap()->n_par_threads() == |
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4114 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
0 | 4115 int cp = SharedHeap::heap()->strong_roots_parity(); |
4116 ALL_JAVA_THREADS(p) { | |
4117 if (p->claim_oops_do(is_par, cp)) { | |
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4118 p->oops_do(f, cf); |
0 | 4119 } |
4120 } | |
4121 VMThread* vmt = VMThread::vm_thread(); | |
3979
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4122 if (vmt->claim_oops_do(is_par, cp)) { |
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4123 vmt->oops_do(f, cf); |
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4124 } |
0 | 4125 } |
4126 | |
4127 #ifndef SERIALGC | |
4128 // Used by ParallelScavenge | |
4129 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
4130 ALL_JAVA_THREADS(p) { | |
4131 q->enqueue(new ThreadRootsTask(p)); | |
4132 } | |
4133 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
4134 } | |
4135 | |
4136 // Used by Parallel Old | |
4137 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
4138 ALL_JAVA_THREADS(p) { | |
4139 q->enqueue(new ThreadRootsMarkingTask(p)); | |
4140 } | |
4141 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
4142 } | |
4143 #endif // SERIALGC | |
4144 | |
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4145 void Threads::nmethods_do(CodeBlobClosure* cf) { |
0 | 4146 ALL_JAVA_THREADS(p) { |
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4147 p->nmethods_do(cf); |
0 | 4148 } |
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4149 VMThread::vm_thread()->nmethods_do(cf); |
0 | 4150 } |
4151 | |
6725
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4152 void Threads::metadata_do(void f(Metadata*)) { |
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4153 ALL_JAVA_THREADS(p) { |
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4154 p->metadata_do(f); |
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4155 } |
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|
4156 } |
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|
4157 |
0 | 4158 void Threads::gc_epilogue() { |
4159 ALL_JAVA_THREADS(p) { | |
4160 p->gc_epilogue(); | |
4161 } | |
4162 } | |
4163 | |
4164 void Threads::gc_prologue() { | |
4165 ALL_JAVA_THREADS(p) { | |
4166 p->gc_prologue(); | |
4167 } | |
4168 } | |
4169 | |
4170 void Threads::deoptimized_wrt_marked_nmethods() { | |
4171 ALL_JAVA_THREADS(p) { | |
4172 p->deoptimized_wrt_marked_nmethods(); | |
4173 } | |
4174 } | |
4175 | |
4176 | |
4177 // Get count Java threads that are waiting to enter the specified monitor. | |
4178 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
4179 address monitor, bool doLock) { | |
4180 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
4181 "must grab Threads_lock or be at safepoint"); | |
4182 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
4183 | |
4184 int i = 0; | |
4185 { | |
4186 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4187 ALL_JAVA_THREADS(p) { | |
4188 if (p->is_Compiler_thread()) continue; | |
4189 | |
4190 address pending = (address)p->current_pending_monitor(); | |
4191 if (pending == monitor) { // found a match | |
4192 if (i < count) result->append(p); // save the first count matches | |
4193 i++; | |
4194 } | |
4195 } | |
4196 } | |
4197 return result; | |
4198 } | |
4199 | |
4200 | |
4201 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
4202 assert(doLock || | |
4203 Threads_lock->owned_by_self() || | |
4204 SafepointSynchronize::is_at_safepoint(), | |
4205 "must grab Threads_lock or be at safepoint"); | |
4206 | |
4207 // NULL owner means not locked so we can skip the search | |
4208 if (owner == NULL) return NULL; | |
4209 | |
4210 { | |
4211 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4212 ALL_JAVA_THREADS(p) { | |
4213 // first, see if owner is the address of a Java thread | |
4214 if (owner == (address)p) return p; | |
4215 } | |
4216 } | |
4217 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
4218 if (UseHeavyMonitors) return NULL; | |
4219 | |
4220 // | |
4221 // If we didn't find a matching Java thread and we didn't force use of | |
4222 // heavyweight monitors, then the owner is the stack address of the | |
4223 // Lock Word in the owning Java thread's stack. | |
4224 // | |
4225 JavaThread* the_owner = NULL; | |
4226 { | |
4227 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4228 ALL_JAVA_THREADS(q) { | |
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|
4229 if (q->is_lock_owned(owner)) { |
0 | 4230 the_owner = q; |
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|
4231 break; |
0 | 4232 } |
4233 } | |
4234 } | |
4235 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
4236 return the_owner; | |
4237 } | |
4238 | |
4239 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
4240 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
4241 char buf[32]; | |
4242 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
4243 | |
4244 st->print_cr("Full thread dump %s (%s %s):", | |
4245 Abstract_VM_Version::vm_name(), | |
4246 Abstract_VM_Version::vm_release(), | |
4247 Abstract_VM_Version::vm_info_string() | |
4248 ); | |
4249 st->cr(); | |
4250 | |
4251 #ifndef SERIALGC | |
4252 // Dump concurrent locks | |
4253 ConcurrentLocksDump concurrent_locks; | |
4254 if (print_concurrent_locks) { | |
4255 concurrent_locks.dump_at_safepoint(); | |
4256 } | |
4257 #endif // SERIALGC | |
4258 | |
4259 ALL_JAVA_THREADS(p) { | |
4260 ResourceMark rm; | |
4261 p->print_on(st); | |
4262 if (print_stacks) { | |
4263 if (internal_format) { | |
4264 p->trace_stack(); | |
4265 } else { | |
4266 p->print_stack_on(st); | |
4267 } | |
4268 } | |
4269 st->cr(); | |
4270 #ifndef SERIALGC | |
4271 if (print_concurrent_locks) { | |
4272 concurrent_locks.print_locks_on(p, st); | |
4273 } | |
4274 #endif // SERIALGC | |
4275 } | |
4276 | |
4277 VMThread::vm_thread()->print_on(st); | |
4278 st->cr(); | |
4279 Universe::heap()->print_gc_threads_on(st); | |
4280 WatcherThread* wt = WatcherThread::watcher_thread(); | |
6766 | 4281 if (wt != NULL) { |
4282 wt->print_on(st); | |
4283 st->cr(); | |
4284 } | |
0 | 4285 CompileBroker::print_compiler_threads_on(st); |
4286 st->flush(); | |
4287 } | |
4288 | |
4289 // Threads::print_on_error() is called by fatal error handler. It's possible | |
4290 // that VM is not at safepoint and/or current thread is inside signal handler. | |
4291 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
4292 // memory (even in resource area), it might deadlock the error handler. | |
4293 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
4294 bool found_current = false; | |
4295 st->print_cr("Java Threads: ( => current thread )"); | |
4296 ALL_JAVA_THREADS(thread) { | |
4297 bool is_current = (current == thread); | |
4298 found_current = found_current || is_current; | |
4299 | |
4300 st->print("%s", is_current ? "=>" : " "); | |
4301 | |
4302 st->print(PTR_FORMAT, thread); | |
4303 st->print(" "); | |
4304 thread->print_on_error(st, buf, buflen); | |
4305 st->cr(); | |
4306 } | |
4307 st->cr(); | |
4308 | |
4309 st->print_cr("Other Threads:"); | |
4310 if (VMThread::vm_thread()) { | |
4311 bool is_current = (current == VMThread::vm_thread()); | |
4312 found_current = found_current || is_current; | |
4313 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
4314 | |
4315 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
4316 st->print(" "); | |
4317 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
4318 st->cr(); | |
4319 } | |
4320 WatcherThread* wt = WatcherThread::watcher_thread(); | |
4321 if (wt != NULL) { | |
4322 bool is_current = (current == wt); | |
4323 found_current = found_current || is_current; | |
4324 st->print("%s", is_current ? "=>" : " "); | |
4325 | |
4326 st->print(PTR_FORMAT, wt); | |
4327 st->print(" "); | |
4328 wt->print_on_error(st, buf, buflen); | |
4329 st->cr(); | |
4330 } | |
4331 if (!found_current) { | |
4332 st->cr(); | |
4333 st->print("=>" PTR_FORMAT " (exited) ", current); | |
4334 current->print_on_error(st, buf, buflen); | |
4335 st->cr(); | |
4336 } | |
4337 } | |
4338 | |
1878 | 4339 // Internal SpinLock and Mutex |
4340 // Based on ParkEvent | |
4341 | |
4342 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
0 | 4343 // |
1878 | 4344 // We employ SpinLocks _only for low-contention, fixed-length |
4345 // short-duration critical sections where we're concerned | |
4346 // about native mutex_t or HotSpot Mutex:: latency. | |
4347 // The mux construct provides a spin-then-block mutual exclusion | |
4348 // mechanism. | |
4349 // | |
4350 // Testing has shown that contention on the ListLock guarding gFreeList | |
4351 // is common. If we implement ListLock as a simple SpinLock it's common | |
4352 // for the JVM to devolve to yielding with little progress. This is true | |
4353 // despite the fact that the critical sections protected by ListLock are | |
4354 // extremely short. | |
0 | 4355 // |
1878 | 4356 // TODO-FIXME: ListLock should be of type SpinLock. |
4357 // We should make this a 1st-class type, integrated into the lock | |
4358 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
4359 // should have sufficient padding to avoid false-sharing and excessive | |
4360 // cache-coherency traffic. | |
4361 | |
4362 | |
4363 typedef volatile int SpinLockT ; | |
4364 | |
4365 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
4366 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
4367 return ; // normal fast-path return | |
4368 } | |
4369 | |
4370 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
4371 TEVENT (SpinAcquire - ctx) ; | |
4372 int ctr = 0 ; | |
4373 int Yields = 0 ; | |
0 | 4374 for (;;) { |
1878 | 4375 while (*adr != 0) { |
4376 ++ctr ; | |
4377 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
4378 if (Yields > 5) { | |
4379 // Consider using a simple NakedSleep() instead. | |
4380 // Then SpinAcquire could be called by non-JVM threads | |
4381 Thread::current()->_ParkEvent->park(1) ; | |
4382 } else { | |
4383 os::NakedYield() ; | |
4384 ++Yields ; | |
4385 } | |
4386 } else { | |
4387 SpinPause() ; | |
0 | 4388 } |
1878 | 4389 } |
4390 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
0 | 4391 } |
4392 } | |
4393 | |
1878 | 4394 void Thread::SpinRelease (volatile int * adr) { |
4395 assert (*adr != 0, "invariant") ; | |
4396 OrderAccess::fence() ; // guarantee at least release consistency. | |
4397 // Roach-motel semantics. | |
4398 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
4399 // but prior LDs and STs within the critical section can't be allowed | |
4400 // to reorder or float past the ST that releases the lock. | |
4401 *adr = 0 ; | |
0 | 4402 } |
4403 | |
1878 | 4404 // muxAcquire and muxRelease: |
4405 // | |
4406 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
4407 // The LSB of the word is set IFF the lock is held. | |
4408 // The remainder of the word points to the head of a singly-linked list | |
4409 // of threads blocked on the lock. | |
4410 // | |
4411 // * The current implementation of muxAcquire-muxRelease uses its own | |
4412 // dedicated Thread._MuxEvent instance. If we're interested in | |
4413 // minimizing the peak number of extant ParkEvent instances then | |
4414 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
4415 // as certain invariants were satisfied. Specifically, care would need | |
4416 // to be taken with regards to consuming unpark() "permits". | |
4417 // A safe rule of thumb is that a thread would never call muxAcquire() | |
4418 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
4419 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
4420 // consume an unpark() permit intended for monitorenter, for instance. | |
4421 // One way around this would be to widen the restricted-range semaphore | |
4422 // implemented in park(). Another alternative would be to provide | |
4423 // multiple instances of the PlatformEvent() for each thread. One | |
4424 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
4425 // | |
4426 // * Usage: | |
4427 // -- Only as leaf locks | |
4428 // -- for short-term locking only as muxAcquire does not perform | |
4429 // thread state transitions. | |
4430 // | |
4431 // Alternatives: | |
4432 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
4433 // but with parking or spin-then-park instead of pure spinning. | |
4434 // * Use Taura-Oyama-Yonenzawa locks. | |
4435 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
4436 // (List,LockByte). Acquire will CAS the full lockword while Release | |
4437 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
4438 // acquiring threads use timers (ParkTimed) to detect and recover from | |
4439 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
4440 // boundaries by using placement-new. | |
4441 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
4442 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
4443 // The validity of the backlinks must be ratified before we trust the value. | |
4444 // If the backlinks are invalid the exiting thread must back-track through the | |
4445 // the forward links, which are always trustworthy. | |
4446 // * Add a successor indication. The LockWord is currently encoded as | |
4447 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
4448 // to provide the usual futile-wakeup optimization. | |
4449 // See RTStt for details. | |
4450 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
4451 // | |
4452 | |
4453 | |
4454 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
4455 enum MuxBits { LOCKBIT = 1 } ; | |
4456 | |
4457 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
4458 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4459 if (w == 0) return ; | |
4460 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4461 return ; | |
4462 } | |
4463 | |
4464 TEVENT (muxAcquire - Contention) ; | |
4465 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
4466 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
0 | 4467 for (;;) { |
1878 | 4468 int its = (os::is_MP() ? 100 : 0) + 1 ; |
4469 | |
4470 // Optional spin phase: spin-then-park strategy | |
4471 while (--its >= 0) { | |
4472 w = *Lock ; | |
4473 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4474 return ; | |
4475 } | |
4476 } | |
4477 | |
4478 Self->reset() ; | |
4479 Self->OnList = intptr_t(Lock) ; | |
4480 // The following fence() isn't _strictly necessary as the subsequent | |
4481 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4482 OrderAccess::fence(); | |
4483 for (;;) { | |
4484 w = *Lock ; | |
4485 if ((w & LOCKBIT) == 0) { | |
4486 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4487 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
4488 return ; | |
4489 } | |
4490 continue ; // Interference -- *Lock changed -- Just retry | |
0 | 4491 } |
1878 | 4492 assert (w & LOCKBIT, "invariant") ; |
4493 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4494 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
4495 } | |
4496 | |
4497 while (Self->OnList != 0) { | |
4498 Self->park() ; | |
4499 } | |
0 | 4500 } |
4501 } | |
4502 | |
1878 | 4503 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
4504 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4505 if (w == 0) return ; | |
4506 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4507 return ; | |
4508 } | |
4509 | |
4510 TEVENT (muxAcquire - Contention) ; | |
4511 ParkEvent * ReleaseAfter = NULL ; | |
4512 if (ev == NULL) { | |
4513 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
4514 } | |
4515 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
4516 for (;;) { | |
4517 guarantee (ev->OnList == 0, "invariant") ; | |
4518 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
4519 | |
4520 // Optional spin phase: spin-then-park strategy | |
4521 while (--its >= 0) { | |
4522 w = *Lock ; | |
4523 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4524 if (ReleaseAfter != NULL) { | |
4525 ParkEvent::Release (ReleaseAfter) ; | |
4526 } | |
4527 return ; | |
4528 } | |
4529 } | |
4530 | |
4531 ev->reset() ; | |
4532 ev->OnList = intptr_t(Lock) ; | |
4533 // The following fence() isn't _strictly necessary as the subsequent | |
4534 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4535 OrderAccess::fence(); | |
4536 for (;;) { | |
4537 w = *Lock ; | |
4538 if ((w & LOCKBIT) == 0) { | |
4539 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4540 ev->OnList = 0 ; | |
4541 // We call ::Release while holding the outer lock, thus | |
4542 // artificially lengthening the critical section. | |
4543 // Consider deferring the ::Release() until the subsequent unlock(), | |
4544 // after we've dropped the outer lock. | |
4545 if (ReleaseAfter != NULL) { | |
4546 ParkEvent::Release (ReleaseAfter) ; | |
4547 } | |
4548 return ; | |
4549 } | |
4550 continue ; // Interference -- *Lock changed -- Just retry | |
4551 } | |
4552 assert (w & LOCKBIT, "invariant") ; | |
4553 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4554 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
4555 } | |
4556 | |
4557 while (ev->OnList != 0) { | |
4558 ev->park() ; | |
4559 } | |
4560 } | |
4561 } | |
4562 | |
4563 // Release() must extract a successor from the list and then wake that thread. | |
4564 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
4565 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
4566 // Release() would : | |
4567 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
4568 // (B) Extract a successor from the private list "in-hand" | |
4569 // (C) attempt to CAS() the residual back into *Lock over null. | |
4570 // If there were any newly arrived threads and the CAS() would fail. | |
4571 // In that case Release() would detach the RATs, re-merge the list in-hand | |
4572 // with the RATs and repeat as needed. Alternately, Release() might | |
4573 // detach and extract a successor, but then pass the residual list to the wakee. | |
4574 // The wakee would be responsible for reattaching and remerging before it | |
4575 // competed for the lock. | |
4576 // | |
4577 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
4578 // multiple concurrent pushers, but only one popper or detacher. | |
4579 // This implementation pops from the head of the list. This is unfair, | |
4580 // but tends to provide excellent throughput as hot threads remain hot. | |
4581 // (We wake recently run threads first). | |
4582 | |
4583 void Thread::muxRelease (volatile intptr_t * Lock) { | |
4584 for (;;) { | |
4585 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
4586 assert (w & LOCKBIT, "invariant") ; | |
4587 if (w == LOCKBIT) return ; | |
4588 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
4589 assert (List != NULL, "invariant") ; | |
4590 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
4591 ParkEvent * nxt = List->ListNext ; | |
4592 | |
4593 // The following CAS() releases the lock and pops the head element. | |
4594 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
4595 continue ; | |
4596 } | |
4597 List->OnList = 0 ; | |
4598 OrderAccess::fence() ; | |
4599 List->unpark () ; | |
4600 return ; | |
4601 } | |
4602 } | |
4603 | |
4604 | |
0 | 4605 void Threads::verify() { |
4606 ALL_JAVA_THREADS(p) { | |
4607 p->verify(); | |
4608 } | |
4609 VMThread* thread = VMThread::vm_thread(); | |
4610 if (thread != NULL) thread->verify(); | |
4611 } |