Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/thread.cpp @ 8124:5fc51c1ecdeb
Merge.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Tue, 05 Mar 2013 23:44:54 +0100 |
parents | c6c72de0537e b8d5d7a6c94c |
children | b8f261ba79c6 |
rev | line source |
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0 | 1 /* |
7951 | 2 * Copyright (c) 1997, 2013, 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" | |
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32 #ifdef GRAAL |
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33 #include "graal/graalCompiler.hpp" |
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34 #endif |
1972 | 35 #include "interpreter/interpreter.hpp" |
36 #include "interpreter/linkResolver.hpp" | |
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37 #include "interpreter/oopMapCache.hpp" |
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38 #include "jvmtifiles/jvmtiEnv.hpp" |
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39 #include "memory/gcLocker.inline.hpp" |
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40 #include "memory/metaspaceShared.hpp" |
1972 | 41 #include "memory/oopFactory.hpp" |
42 #include "memory/universe.inline.hpp" | |
43 #include "oops/instanceKlass.hpp" | |
44 #include "oops/objArrayOop.hpp" | |
45 #include "oops/oop.inline.hpp" | |
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46 #include "oops/symbol.hpp" |
1972 | 47 #include "prims/jvm_misc.hpp" |
48 #include "prims/jvmtiExport.hpp" | |
49 #include "prims/jvmtiThreadState.hpp" | |
50 #include "prims/privilegedStack.hpp" | |
51 #include "runtime/aprofiler.hpp" | |
52 #include "runtime/arguments.hpp" | |
53 #include "runtime/biasedLocking.hpp" | |
54 #include "runtime/deoptimization.hpp" | |
55 #include "runtime/fprofiler.hpp" | |
56 #include "runtime/frame.inline.hpp" | |
57 #include "runtime/init.hpp" | |
58 #include "runtime/interfaceSupport.hpp" | |
59 #include "runtime/java.hpp" | |
60 #include "runtime/javaCalls.hpp" | |
61 #include "runtime/jniPeriodicChecker.hpp" | |
62 #include "runtime/memprofiler.hpp" | |
63 #include "runtime/mutexLocker.hpp" | |
64 #include "runtime/objectMonitor.hpp" | |
65 #include "runtime/osThread.hpp" | |
66 #include "runtime/safepoint.hpp" | |
67 #include "runtime/sharedRuntime.hpp" | |
68 #include "runtime/statSampler.hpp" | |
69 #include "runtime/stubRoutines.hpp" | |
70 #include "runtime/task.hpp" | |
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71 #include "runtime/thread.inline.hpp" |
1972 | 72 #include "runtime/threadCritical.hpp" |
73 #include "runtime/threadLocalStorage.hpp" | |
74 #include "runtime/vframe.hpp" | |
75 #include "runtime/vframeArray.hpp" | |
76 #include "runtime/vframe_hp.hpp" | |
77 #include "runtime/vmThread.hpp" | |
78 #include "runtime/vm_operations.hpp" | |
79 #include "services/attachListener.hpp" | |
80 #include "services/management.hpp" | |
6197 | 81 #include "services/memTracker.hpp" |
1972 | 82 #include "services/threadService.hpp" |
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83 #include "trace/traceEventTypes.hpp" |
1972 | 84 #include "utilities/defaultStream.hpp" |
85 #include "utilities/dtrace.hpp" | |
86 #include "utilities/events.hpp" | |
87 #include "utilities/preserveException.hpp" | |
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88 #include "utilities/macros.hpp" |
1972 | 89 #ifdef TARGET_OS_FAMILY_linux |
90 # include "os_linux.inline.hpp" | |
91 #endif | |
92 #ifdef TARGET_OS_FAMILY_solaris | |
93 # include "os_solaris.inline.hpp" | |
94 #endif | |
95 #ifdef TARGET_OS_FAMILY_windows | |
96 # include "os_windows.inline.hpp" | |
97 #endif | |
3960 | 98 #ifdef TARGET_OS_FAMILY_bsd |
99 # include "os_bsd.inline.hpp" | |
100 #endif | |
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101 #if INCLUDE_ALL_GCS |
1972 | 102 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" |
103 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
104 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
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105 #endif // INCLUDE_ALL_GCS |
1972 | 106 #ifdef COMPILER1 |
107 #include "c1/c1_Compiler.hpp" | |
108 #endif | |
109 #ifdef COMPILER2 | |
110 #include "opto/c2compiler.hpp" | |
111 #include "opto/idealGraphPrinter.hpp" | |
112 #endif | |
0 | 113 |
114 #ifdef DTRACE_ENABLED | |
115 | |
116 // Only bother with this argument setup if dtrace is available | |
117 | |
4006 | 118 #ifndef USDT2 |
0 | 119 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); |
120 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
121 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
122 intptr_t, intptr_t, bool); | |
123 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
124 intptr_t, intptr_t, bool); | |
125 | |
126 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
127 { \ | |
128 ResourceMark rm(this); \ | |
129 int len = 0; \ | |
130 const char* name = (javathread)->get_thread_name(); \ | |
131 len = strlen(name); \ | |
132 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
133 name, len, \ | |
134 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
135 (javathread)->osthread()->thread_id(), \ | |
136 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
137 } | |
138 | |
4006 | 139 #else /* USDT2 */ |
140 | |
141 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_PROBE_START | |
142 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_PROBE_STOP | |
143 | |
144 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
145 { \ | |
146 ResourceMark rm(this); \ | |
147 int len = 0; \ | |
148 const char* name = (javathread)->get_thread_name(); \ | |
149 len = strlen(name); \ | |
150 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \ | |
151 (char *) name, len, \ | |
152 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
153 (uintptr_t) (javathread)->osthread()->thread_id(), \ | |
154 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
155 } | |
156 | |
157 #endif /* USDT2 */ | |
158 | |
0 | 159 #else // ndef DTRACE_ENABLED |
160 | |
161 #define DTRACE_THREAD_PROBE(probe, javathread) | |
162 | |
163 #endif // ndef DTRACE_ENABLED | |
164 | |
6197 | 165 |
0 | 166 // Class hierarchy |
167 // - Thread | |
168 // - VMThread | |
169 // - WatcherThread | |
170 // - ConcurrentMarkSweepThread | |
171 // - JavaThread | |
172 // - CompilerThread | |
173 | |
174 // ======= Thread ======== | |
175 // Support for forcing alignment of thread objects for biased locking | |
6197 | 176 void* Thread::allocate(size_t size, bool throw_excpt, MEMFLAGS flags) { |
0 | 177 if (UseBiasedLocking) { |
178 const int alignment = markOopDesc::biased_lock_alignment; | |
179 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
6197 | 180 void* real_malloc_addr = throw_excpt? AllocateHeap(aligned_size, flags, CURRENT_PC) |
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181 : AllocateHeap(aligned_size, flags, CURRENT_PC, |
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182 AllocFailStrategy::RETURN_NULL); |
0 | 183 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); |
184 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
185 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
186 "JavaThread alignment code overflowed allocated storage"); | |
187 if (TraceBiasedLocking) { | |
188 if (aligned_addr != real_malloc_addr) | |
189 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
190 real_malloc_addr, aligned_addr); | |
191 } | |
192 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
193 return aligned_addr; | |
194 } else { | |
6197 | 195 return throw_excpt? AllocateHeap(size, flags, CURRENT_PC) |
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196 : AllocateHeap(size, flags, CURRENT_PC, AllocFailStrategy::RETURN_NULL); |
0 | 197 } |
198 } | |
199 | |
200 void Thread::operator delete(void* p) { | |
201 if (UseBiasedLocking) { | |
202 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
6197 | 203 FreeHeap(real_malloc_addr, mtThread); |
0 | 204 } else { |
6197 | 205 FreeHeap(p, mtThread); |
0 | 206 } |
207 } | |
208 | |
209 | |
210 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
211 // JavaThread | |
212 | |
213 | |
214 Thread::Thread() { | |
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215 // stack and get_thread |
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216 set_stack_base(NULL); |
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217 set_stack_size(0); |
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218 set_self_raw_id(0); |
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219 set_lgrp_id(-1); |
0 | 220 |
221 // allocated data structures | |
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222 set_osthread(NULL); |
6197 | 223 set_resource_area(new (mtThread)ResourceArea()); |
224 set_handle_area(new (mtThread) HandleArea(NULL)); | |
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225 set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(300, true)); |
0 | 226 set_active_handles(NULL); |
227 set_free_handle_block(NULL); | |
228 set_last_handle_mark(NULL); | |
229 | |
230 // This initial value ==> never claimed. | |
231 _oops_do_parity = 0; | |
232 | |
233 // the handle mark links itself to last_handle_mark | |
234 new HandleMark(this); | |
235 | |
236 // plain initialization | |
237 debug_only(_owned_locks = NULL;) | |
238 debug_only(_allow_allocation_count = 0;) | |
239 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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240 NOT_PRODUCT(_skip_gcalot = false;) |
0 | 241 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
242 _jvmti_env_iteration_count = 0; | |
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243 set_allocated_bytes(0); |
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244 set_trace_buffer(NULL); |
0 | 245 _vm_operation_started_count = 0; |
246 _vm_operation_completed_count = 0; | |
247 _current_pending_monitor = NULL; | |
248 _current_pending_monitor_is_from_java = true; | |
249 _current_waiting_monitor = NULL; | |
250 _num_nested_signal = 0; | |
251 omFreeList = NULL ; | |
252 omFreeCount = 0 ; | |
253 omFreeProvision = 32 ; | |
1587 | 254 omInUseList = NULL ; |
255 omInUseCount = 0 ; | |
0 | 256 |
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257 #ifdef ASSERT |
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258 _visited_for_critical_count = false; |
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259 #endif |
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260 |
0 | 261 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); |
262 _suspend_flags = 0; | |
263 | |
264 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
265 _hashStateX = os::random() ; | |
266 _hashStateY = 842502087 ; | |
267 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
268 _hashStateW = 273326509 ; | |
269 | |
270 _OnTrap = 0 ; | |
271 _schedctl = NULL ; | |
272 _Stalled = 0 ; | |
273 _TypeTag = 0x2BAD ; | |
274 | |
275 // Many of the following fields are effectively final - immutable | |
276 // Note that nascent threads can't use the Native Monitor-Mutex | |
277 // construct until the _MutexEvent is initialized ... | |
278 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
279 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
280 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
281 // and ::Release() | |
282 _ParkEvent = ParkEvent::Allocate (this) ; | |
283 _SleepEvent = ParkEvent::Allocate (this) ; | |
284 _MutexEvent = ParkEvent::Allocate (this) ; | |
285 _MuxEvent = ParkEvent::Allocate (this) ; | |
286 | |
287 #ifdef CHECK_UNHANDLED_OOPS | |
288 if (CheckUnhandledOops) { | |
289 _unhandled_oops = new UnhandledOops(this); | |
290 } | |
291 #endif // CHECK_UNHANDLED_OOPS | |
292 #ifdef ASSERT | |
293 if (UseBiasedLocking) { | |
294 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
295 assert(this == _real_malloc_address || | |
296 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
297 "bug in forced alignment of thread objects"); | |
298 } | |
299 #endif /* ASSERT */ | |
300 } | |
301 | |
302 void Thread::initialize_thread_local_storage() { | |
303 // Note: Make sure this method only calls | |
304 // non-blocking operations. Otherwise, it might not work | |
305 // with the thread-startup/safepoint interaction. | |
306 | |
307 // During Java thread startup, safepoint code should allow this | |
308 // method to complete because it may need to allocate memory to | |
309 // store information for the new thread. | |
310 | |
311 // initialize structure dependent on thread local storage | |
312 ThreadLocalStorage::set_thread(this); | |
313 } | |
314 | |
315 void Thread::record_stack_base_and_size() { | |
316 set_stack_base(os::current_stack_base()); | |
317 set_stack_size(os::current_stack_size()); | |
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318 // CR 7190089: on Solaris, primordial thread's stack is adjusted |
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319 // in initialize_thread(). Without the adjustment, stack size is |
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320 // incorrect if stack is set to unlimited (ulimit -s unlimited). |
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321 // So far, only Solaris has real implementation of initialize_thread(). |
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322 // |
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323 // set up any platform-specific state. |
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324 os::initialize_thread(this); |
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325 |
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326 #if INCLUDE_NMT |
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327 // record thread's native stack, stack grows downward |
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328 address stack_low_addr = stack_base() - stack_size(); |
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329 MemTracker::record_thread_stack(stack_low_addr, stack_size(), this, |
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330 CURRENT_PC); |
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331 #endif // INCLUDE_NMT |
0 | 332 } |
333 | |
334 | |
335 Thread::~Thread() { | |
336 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
337 ObjectSynchronizer::omFlush (this) ; | |
338 | |
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339 // stack_base can be NULL if the thread is never started or exited before |
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340 // record_stack_base_and_size called. Although, we would like to ensure |
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341 // that all started threads do call record_stack_base_and_size(), there is |
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342 // not proper way to enforce that. |
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343 #if INCLUDE_NMT |
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344 if (_stack_base != NULL) { |
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345 address low_stack_addr = stack_base() - stack_size(); |
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346 MemTracker::release_thread_stack(low_stack_addr, stack_size(), this); |
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347 #ifdef ASSERT |
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348 set_stack_base(NULL); |
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349 #endif |
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350 } |
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351 #endif // INCLUDE_NMT |
6197 | 352 |
0 | 353 // deallocate data structures |
354 delete resource_area(); | |
355 // since the handle marks are using the handle area, we have to deallocated the root | |
356 // handle mark before deallocating the thread's handle area, | |
357 assert(last_handle_mark() != NULL, "check we have an element"); | |
358 delete last_handle_mark(); | |
359 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
360 | |
361 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
362 // We NULL out the fields for good hygiene. | |
363 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
364 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
365 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
366 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
367 | |
368 delete handle_area(); | |
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369 delete metadata_handles(); |
0 | 370 |
371 // osthread() can be NULL, if creation of thread failed. | |
372 if (osthread() != NULL) os::free_thread(osthread()); | |
373 | |
374 delete _SR_lock; | |
375 | |
376 // clear thread local storage if the Thread is deleting itself | |
377 if (this == Thread::current()) { | |
378 ThreadLocalStorage::set_thread(NULL); | |
379 } else { | |
380 // In the case where we're not the current thread, invalidate all the | |
381 // caches in case some code tries to get the current thread or the | |
382 // thread that was destroyed, and gets stale information. | |
383 ThreadLocalStorage::invalidate_all(); | |
384 } | |
385 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
386 } | |
387 | |
388 // NOTE: dummy function for assertion purpose. | |
389 void Thread::run() { | |
390 ShouldNotReachHere(); | |
391 } | |
392 | |
393 #ifdef ASSERT | |
394 // Private method to check for dangling thread pointer | |
395 void check_for_dangling_thread_pointer(Thread *thread) { | |
396 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
397 "possibility of dangling Thread pointer"); | |
398 } | |
399 #endif | |
400 | |
401 | |
402 #ifndef PRODUCT | |
403 // Tracing method for basic thread operations | |
404 void Thread::trace(const char* msg, const Thread* const thread) { | |
405 if (!TraceThreadEvents) return; | |
406 ResourceMark rm; | |
407 ThreadCritical tc; | |
408 const char *name = "non-Java thread"; | |
409 int prio = -1; | |
410 if (thread->is_Java_thread() | |
411 && !thread->is_Compiler_thread()) { | |
412 // The Threads_lock must be held to get information about | |
413 // this thread but may not be in some situations when | |
414 // tracing thread events. | |
415 bool release_Threads_lock = false; | |
416 if (!Threads_lock->owned_by_self()) { | |
417 Threads_lock->lock(); | |
418 release_Threads_lock = true; | |
419 } | |
420 JavaThread* jt = (JavaThread *)thread; | |
421 name = (char *)jt->get_thread_name(); | |
422 oop thread_oop = jt->threadObj(); | |
423 if (thread_oop != NULL) { | |
424 prio = java_lang_Thread::priority(thread_oop); | |
425 } | |
426 if (release_Threads_lock) { | |
427 Threads_lock->unlock(); | |
428 } | |
429 } | |
430 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
431 } | |
432 #endif | |
433 | |
434 | |
435 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
436 trace("get priority", thread); | |
437 ThreadPriority priority; | |
438 // Can return an error! | |
439 (void)os::get_priority(thread, priority); | |
440 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
441 return priority; | |
442 } | |
443 | |
444 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
445 trace("set priority", thread); | |
446 debug_only(check_for_dangling_thread_pointer(thread);) | |
447 // Can return an error! | |
448 (void)os::set_priority(thread, priority); | |
449 } | |
450 | |
451 | |
452 void Thread::start(Thread* thread) { | |
453 trace("start", thread); | |
454 // Start is different from resume in that its safety is guaranteed by context or | |
455 // being called from a Java method synchronized on the Thread object. | |
456 if (!DisableStartThread) { | |
457 if (thread->is_Java_thread()) { | |
458 // Initialize the thread state to RUNNABLE before starting this thread. | |
459 // Can not set it after the thread started because we do not know the | |
460 // exact thread state at that time. It could be in MONITOR_WAIT or | |
461 // in SLEEPING or some other state. | |
462 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
463 java_lang_Thread::RUNNABLE); | |
464 } | |
465 os::start_thread(thread); | |
466 } | |
467 } | |
468 | |
469 // Enqueue a VM_Operation to do the job for us - sometime later | |
470 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
471 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
472 VMThread::execute(vm_stop); | |
473 } | |
474 | |
475 | |
476 // | |
477 // Check if an external suspend request has completed (or has been | |
478 // cancelled). Returns true if the thread is externally suspended and | |
479 // false otherwise. | |
480 // | |
481 // The bits parameter returns information about the code path through | |
482 // the routine. Useful for debugging: | |
483 // | |
484 // set in is_ext_suspend_completed(): | |
485 // 0x00000001 - routine was entered | |
486 // 0x00000010 - routine return false at end | |
487 // 0x00000100 - thread exited (return false) | |
488 // 0x00000200 - suspend request cancelled (return false) | |
489 // 0x00000400 - thread suspended (return true) | |
490 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
491 // 0x00002000 - thread is native and walkable (return true) | |
492 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
493 // | |
494 // set in wait_for_ext_suspend_completion(): | |
495 // 0x00010000 - routine was entered | |
496 // 0x00020000 - suspend request cancelled before loop (return false) | |
497 // 0x00040000 - thread suspended before loop (return true) | |
498 // 0x00080000 - suspend request cancelled in loop (return false) | |
499 // 0x00100000 - thread suspended in loop (return true) | |
500 // 0x00200000 - suspend not completed during retry loop (return false) | |
501 // | |
502 | |
503 // Helper class for tracing suspend wait debug bits. | |
504 // | |
505 // 0x00000100 indicates that the target thread exited before it could | |
506 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
507 // 0x00080000 each indicate a cancelled suspend request so they don't | |
508 // count as wait failures either. | |
509 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
510 | |
511 class TraceSuspendDebugBits : public StackObj { | |
512 private: | |
513 JavaThread * jt; | |
514 bool is_wait; | |
515 bool called_by_wait; // meaningful when !is_wait | |
516 uint32_t * bits; | |
517 | |
518 public: | |
519 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
520 uint32_t *_bits) { | |
521 jt = _jt; | |
522 is_wait = _is_wait; | |
523 called_by_wait = _called_by_wait; | |
524 bits = _bits; | |
525 } | |
526 | |
527 ~TraceSuspendDebugBits() { | |
528 if (!is_wait) { | |
529 #if 1 | |
530 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
531 // That trace is very chatty. | |
532 return; | |
533 #else | |
534 if (!called_by_wait) { | |
535 // If tracing for is_ext_suspend_completed() is enabled, then only | |
536 // trace calls to it from wait_for_ext_suspend_completion() | |
537 return; | |
538 } | |
539 #endif | |
540 } | |
541 | |
542 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
543 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
544 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
545 ResourceMark rm; | |
546 | |
547 tty->print_cr( | |
548 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
549 jt->get_thread_name(), *bits); | |
550 | |
551 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
552 } | |
553 } | |
554 } | |
555 }; | |
556 #undef DEBUG_FALSE_BITS | |
557 | |
558 | |
559 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
560 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
561 | |
562 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
563 bool do_trans_retry; // flag to force the retry | |
564 | |
565 *bits |= 0x00000001; | |
566 | |
567 do { | |
568 do_trans_retry = false; | |
569 | |
570 if (is_exiting()) { | |
571 // Thread is in the process of exiting. This is always checked | |
572 // first to reduce the risk of dereferencing a freed JavaThread. | |
573 *bits |= 0x00000100; | |
574 return false; | |
575 } | |
576 | |
577 if (!is_external_suspend()) { | |
578 // Suspend request is cancelled. This is always checked before | |
579 // is_ext_suspended() to reduce the risk of a rogue resume | |
580 // confusing the thread that made the suspend request. | |
581 *bits |= 0x00000200; | |
582 return false; | |
583 } | |
584 | |
585 if (is_ext_suspended()) { | |
586 // thread is suspended | |
587 *bits |= 0x00000400; | |
588 return true; | |
589 } | |
590 | |
591 // Now that we no longer do hard suspends of threads running | |
592 // native code, the target thread can be changing thread state | |
593 // while we are in this routine: | |
594 // | |
595 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
596 // | |
597 // We save a copy of the thread state as observed at this moment | |
598 // and make our decision about suspend completeness based on the | |
599 // copy. This closes the race where the thread state is seen as | |
600 // _thread_in_native_trans in the if-thread_blocked check, but is | |
601 // seen as _thread_blocked in if-thread_in_native_trans check. | |
602 JavaThreadState save_state = thread_state(); | |
603 | |
604 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
605 // If the thread's state is _thread_blocked and this blocking | |
606 // condition is known to be equivalent to a suspend, then we can | |
607 // consider the thread to be externally suspended. This means that | |
608 // the code that sets _thread_blocked has been modified to do | |
609 // self-suspension if the blocking condition releases. We also | |
610 // used to check for CONDVAR_WAIT here, but that is now covered by | |
611 // the _thread_blocked with self-suspension check. | |
612 // | |
613 // Return true since we wouldn't be here unless there was still an | |
614 // external suspend request. | |
615 *bits |= 0x00001000; | |
616 return true; | |
617 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
618 // Threads running native code will self-suspend on native==>VM/Java | |
619 // transitions. If its stack is walkable (should always be the case | |
620 // unless this function is called before the actual java_suspend() | |
621 // call), then the wait is done. | |
622 *bits |= 0x00002000; | |
623 return true; | |
624 } else if (!called_by_wait && !did_trans_retry && | |
625 save_state == _thread_in_native_trans && | |
626 frame_anchor()->walkable()) { | |
627 // The thread is transitioning from thread_in_native to another | |
628 // thread state. check_safepoint_and_suspend_for_native_trans() | |
629 // will force the thread to self-suspend. If it hasn't gotten | |
630 // there yet we may have caught the thread in-between the native | |
631 // code check above and the self-suspend. Lucky us. If we were | |
632 // called by wait_for_ext_suspend_completion(), then it | |
633 // will be doing the retries so we don't have to. | |
634 // | |
635 // Since we use the saved thread state in the if-statement above, | |
636 // there is a chance that the thread has already transitioned to | |
637 // _thread_blocked by the time we get here. In that case, we will | |
638 // make a single unnecessary pass through the logic below. This | |
639 // doesn't hurt anything since we still do the trans retry. | |
640 | |
641 *bits |= 0x00004000; | |
642 | |
643 // Once the thread leaves thread_in_native_trans for another | |
644 // thread state, we break out of this retry loop. We shouldn't | |
645 // need this flag to prevent us from getting back here, but | |
646 // sometimes paranoia is good. | |
647 did_trans_retry = true; | |
648 | |
649 // We wait for the thread to transition to a more usable state. | |
650 for (int i = 1; i <= SuspendRetryCount; i++) { | |
651 // We used to do an "os::yield_all(i)" call here with the intention | |
652 // that yielding would increase on each retry. However, the parameter | |
653 // is ignored on Linux which means the yield didn't scale up. Waiting | |
654 // on the SR_lock below provides a much more predictable scale up for | |
655 // the delay. It also provides a simple/direct point to check for any | |
656 // safepoint requests from the VMThread | |
657 | |
658 // temporarily drops SR_lock while doing wait with safepoint check | |
659 // (if we're a JavaThread - the WatcherThread can also call this) | |
660 // and increase delay with each retry | |
661 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
662 | |
663 // check the actual thread state instead of what we saved above | |
664 if (thread_state() != _thread_in_native_trans) { | |
665 // the thread has transitioned to another thread state so | |
666 // try all the checks (except this one) one more time. | |
667 do_trans_retry = true; | |
668 break; | |
669 } | |
670 } // end retry loop | |
671 | |
672 | |
673 } | |
674 } while (do_trans_retry); | |
675 | |
676 *bits |= 0x00000010; | |
677 return false; | |
678 } | |
679 | |
680 // | |
681 // Wait for an external suspend request to complete (or be cancelled). | |
682 // Returns true if the thread is externally suspended and false otherwise. | |
683 // | |
684 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
685 uint32_t *bits) { | |
686 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
687 false /* !called_by_wait */, bits); | |
688 | |
689 // local flag copies to minimize SR_lock hold time | |
690 bool is_suspended; | |
691 bool pending; | |
692 uint32_t reset_bits; | |
693 | |
694 // set a marker so is_ext_suspend_completed() knows we are the caller | |
695 *bits |= 0x00010000; | |
696 | |
697 // We use reset_bits to reinitialize the bits value at the top of | |
698 // each retry loop. This allows the caller to make use of any | |
699 // unused bits for their own marking purposes. | |
700 reset_bits = *bits; | |
701 | |
702 { | |
703 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
704 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
705 delay, bits); | |
706 pending = is_external_suspend(); | |
707 } | |
708 // must release SR_lock to allow suspension to complete | |
709 | |
710 if (!pending) { | |
711 // A cancelled suspend request is the only false return from | |
712 // is_ext_suspend_completed() that keeps us from entering the | |
713 // retry loop. | |
714 *bits |= 0x00020000; | |
715 return false; | |
716 } | |
717 | |
718 if (is_suspended) { | |
719 *bits |= 0x00040000; | |
720 return true; | |
721 } | |
722 | |
723 for (int i = 1; i <= retries; i++) { | |
724 *bits = reset_bits; // reinit to only track last retry | |
725 | |
726 // We used to do an "os::yield_all(i)" call here with the intention | |
727 // that yielding would increase on each retry. However, the parameter | |
728 // is ignored on Linux which means the yield didn't scale up. Waiting | |
729 // on the SR_lock below provides a much more predictable scale up for | |
730 // the delay. It also provides a simple/direct point to check for any | |
731 // safepoint requests from the VMThread | |
732 | |
733 { | |
734 MutexLocker ml(SR_lock()); | |
735 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
736 // can also call this) and increase delay with each retry | |
737 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
738 | |
739 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
740 delay, bits); | |
741 | |
742 // It is possible for the external suspend request to be cancelled | |
743 // (by a resume) before the actual suspend operation is completed. | |
744 // Refresh our local copy to see if we still need to wait. | |
745 pending = is_external_suspend(); | |
746 } | |
747 | |
748 if (!pending) { | |
749 // A cancelled suspend request is the only false return from | |
750 // is_ext_suspend_completed() that keeps us from staying in the | |
751 // retry loop. | |
752 *bits |= 0x00080000; | |
753 return false; | |
754 } | |
755 | |
756 if (is_suspended) { | |
757 *bits |= 0x00100000; | |
758 return true; | |
759 } | |
760 } // end retry loop | |
761 | |
762 // thread did not suspend after all our retries | |
763 *bits |= 0x00200000; | |
764 return false; | |
765 } | |
766 | |
767 #ifndef PRODUCT | |
768 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
769 | |
770 // This should not need to be atomic as the only way for simultaneous | |
771 // updates is via interrupts. Even then this should be rare or non-existant | |
772 // and we don't care that much anyway. | |
773 | |
774 int index = _jmp_ring_index; | |
775 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
776 _jmp_ring[index]._target = (intptr_t) target; | |
777 _jmp_ring[index]._instruction = (intptr_t) instr; | |
778 _jmp_ring[index]._file = file; | |
779 _jmp_ring[index]._line = line; | |
780 } | |
781 #endif /* PRODUCT */ | |
782 | |
783 // Called by flat profiler | |
784 // Callers have already called wait_for_ext_suspend_completion | |
785 // The assertion for that is currently too complex to put here: | |
786 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
787 bool gotframe = false; | |
788 // self suspension saves needed state. | |
789 if (has_last_Java_frame() && _anchor.walkable()) { | |
790 *_fr = pd_last_frame(); | |
791 gotframe = true; | |
792 } | |
793 return gotframe; | |
794 } | |
795 | |
796 void Thread::interrupt(Thread* thread) { | |
797 trace("interrupt", thread); | |
798 debug_only(check_for_dangling_thread_pointer(thread);) | |
799 os::interrupt(thread); | |
800 } | |
801 | |
802 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
803 trace("is_interrupted", thread); | |
804 debug_only(check_for_dangling_thread_pointer(thread);) | |
805 // Note: If clear_interrupted==false, this simply fetches and | |
806 // returns the value of the field osthread()->interrupted(). | |
807 return os::is_interrupted(thread, clear_interrupted); | |
808 } | |
809 | |
810 | |
811 // GC Support | |
812 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
813 jint thread_parity = _oops_do_parity; | |
814 if (thread_parity != strong_roots_parity) { | |
815 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
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816 if (res == thread_parity) { |
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817 return true; |
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818 } else { |
0 | 819 guarantee(res == strong_roots_parity, "Or else what?"); |
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820 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
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821 "Should only fail when parallel."); |
0 | 822 return false; |
823 } | |
824 } | |
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825 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
0 | 826 "Should only fail when parallel."); |
827 return false; | |
828 } | |
829 | |
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830 void Thread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
0 | 831 active_handles()->oops_do(f); |
832 // Do oop for ThreadShadow | |
833 f->do_oop((oop*)&_pending_exception); | |
834 handle_area()->oops_do(f); | |
835 } | |
836 | |
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837 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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838 // no nmethods in a generic thread... |
0 | 839 } |
840 | |
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841 void Thread::metadata_do(void f(Metadata*)) { |
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842 if (metadata_handles() != NULL) { |
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843 for (int i = 0; i< metadata_handles()->length(); i++) { |
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844 f(metadata_handles()->at(i)); |
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845 } |
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846 } |
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847 } |
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848 |
0 | 849 void Thread::print_on(outputStream* st) const { |
850 // get_priority assumes osthread initialized | |
851 if (osthread() != NULL) { | |
6766 | 852 int os_prio; |
853 if (os::get_native_priority(this, &os_prio) == OS_OK) { | |
854 st->print("os_prio=%d ", os_prio); | |
855 } | |
856 st->print("tid=" INTPTR_FORMAT " ", this); | |
0 | 857 osthread()->print_on(st); |
858 } | |
859 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
860 } | |
861 | |
862 // Thread::print_on_error() is called by fatal error handler. Don't use | |
863 // any lock or allocate memory. | |
864 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
865 if (is_VM_thread()) st->print("VMThread"); | |
866 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
867 else if (is_Java_thread()) st->print("JavaThread"); | |
868 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
869 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
870 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
871 else st->print("Thread"); | |
872 | |
873 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
874 _stack_base - _stack_size, _stack_base); | |
875 | |
876 if (osthread()) { | |
877 st->print(" [id=%d]", osthread()->thread_id()); | |
878 } | |
879 } | |
880 | |
881 #ifdef ASSERT | |
882 void Thread::print_owned_locks_on(outputStream* st) const { | |
883 Monitor *cur = _owned_locks; | |
884 if (cur == NULL) { | |
885 st->print(" (no locks) "); | |
886 } else { | |
887 st->print_cr(" Locks owned:"); | |
888 while(cur) { | |
889 cur->print_on(st); | |
890 cur = cur->next(); | |
891 } | |
892 } | |
893 } | |
894 | |
895 static int ref_use_count = 0; | |
896 | |
897 bool Thread::owns_locks_but_compiled_lock() const { | |
898 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
899 if (cur != Compile_lock) return true; | |
900 } | |
901 return false; | |
902 } | |
903 | |
904 | |
905 #endif | |
906 | |
907 #ifndef PRODUCT | |
908 | |
909 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
910 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
911 // no threads which allow_vm_block's are held | |
912 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
913 // Check if current thread is allowed to block at a safepoint | |
914 if (!(_allow_safepoint_count == 0)) | |
915 fatal("Possible safepoint reached by thread that does not allow it"); | |
916 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
917 fatal("LEAF method calling lock?"); | |
918 } | |
919 | |
920 #ifdef ASSERT | |
921 if (potential_vm_operation && is_Java_thread() | |
922 && !Universe::is_bootstrapping()) { | |
923 // Make sure we do not hold any locks that the VM thread also uses. | |
924 // This could potentially lead to deadlocks | |
925 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
926 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
927 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
928 // since it is used to transfer control between JavaThreads and the VMThread | |
929 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
930 if ( (cur->allow_vm_block() && | |
931 cur != Threads_lock && | |
932 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
933 cur != VMOperationRequest_lock && | |
934 cur != VMOperationQueue_lock) || | |
935 cur->rank() == Mutex::special) { | |
936 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
937 } | |
938 } | |
939 } | |
940 | |
941 if (GCALotAtAllSafepoints) { | |
942 // We could enter a safepoint here and thus have a gc | |
943 InterfaceSupport::check_gc_alot(); | |
944 } | |
945 #endif | |
946 } | |
947 #endif | |
948 | |
949 bool Thread::is_in_stack(address adr) const { | |
950 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
951 address end = os::current_stack_pointer(); | |
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952 // Allow non Java threads to call this without stack_base |
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953 if (_stack_base == NULL) return true; |
0 | 954 if (stack_base() >= adr && adr >= end) return true; |
955 | |
956 return false; | |
957 } | |
958 | |
959 | |
960 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
961 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
962 // used for compilation in the future. If that change is made, the need for these methods | |
963 // should be revisited, and they should be removed if possible. | |
964 | |
965 bool Thread::is_lock_owned(address adr) const { | |
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966 return on_local_stack(adr); |
0 | 967 } |
968 | |
969 bool Thread::set_as_starting_thread() { | |
970 // NOTE: this must be called inside the main thread. | |
971 return os::create_main_thread((JavaThread*)this); | |
972 } | |
973 | |
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974 static void initialize_class(Symbol* class_name, TRAPS) { |
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975 Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
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976 InstanceKlass::cast(klass)->initialize(CHECK); |
0 | 977 } |
978 | |
979 | |
980 // Creates the initial ThreadGroup | |
981 static Handle create_initial_thread_group(TRAPS) { | |
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982 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
0 | 983 instanceKlassHandle klass (THREAD, k); |
984 | |
985 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
986 { | |
987 JavaValue result(T_VOID); | |
988 JavaCalls::call_special(&result, | |
989 system_instance, | |
990 klass, | |
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991 vmSymbols::object_initializer_name(), |
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992 vmSymbols::void_method_signature(), |
0 | 993 CHECK_NH); |
994 } | |
995 Universe::set_system_thread_group(system_instance()); | |
996 | |
997 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
998 { | |
999 JavaValue result(T_VOID); | |
1000 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
1001 JavaCalls::call_special(&result, | |
1002 main_instance, | |
1003 klass, | |
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1004 vmSymbols::object_initializer_name(), |
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1005 vmSymbols::threadgroup_string_void_signature(), |
0 | 1006 system_instance, |
1007 string, | |
1008 CHECK_NH); | |
1009 } | |
1010 return main_instance; | |
1011 } | |
1012 | |
1013 // Creates the initial Thread | |
1014 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
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1015 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
0 | 1016 instanceKlassHandle klass (THREAD, k); |
1017 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
1018 | |
1019 java_lang_Thread::set_thread(thread_oop(), thread); | |
1020 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1021 thread->set_threadObj(thread_oop()); | |
1022 | |
1023 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
1024 | |
1025 JavaValue result(T_VOID); | |
1026 JavaCalls::call_special(&result, thread_oop, | |
1027 klass, | |
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1028 vmSymbols::object_initializer_name(), |
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1029 vmSymbols::threadgroup_string_void_signature(), |
0 | 1030 thread_group, |
1031 string, | |
1032 CHECK_NULL); | |
1033 return thread_oop(); | |
1034 } | |
1035 | |
1036 static void call_initializeSystemClass(TRAPS) { | |
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1037 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 1038 instanceKlassHandle klass (THREAD, k); |
1039 | |
1040 JavaValue result(T_VOID); | |
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1041 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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1042 vmSymbols::void_method_signature(), CHECK); |
0 | 1043 } |
1044 | |
6181 | 1045 char java_runtime_name[128] = ""; |
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1046 char java_runtime_version[128] = ""; |
6181 | 1047 |
1048 // extract the JRE name from sun.misc.Version.java_runtime_name | |
1049 static const char* get_java_runtime_name(TRAPS) { | |
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1050 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
6181 | 1051 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
1052 fieldDescriptor fd; | |
1053 bool found = k != NULL && | |
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1054 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_name_name(), |
6181 | 1055 vmSymbols::string_signature(), &fd); |
1056 if (found) { | |
1057 oop name_oop = k->java_mirror()->obj_field(fd.offset()); | |
1058 if (name_oop == NULL) | |
1059 return NULL; | |
1060 const char* name = java_lang_String::as_utf8_string(name_oop, | |
1061 java_runtime_name, | |
1062 sizeof(java_runtime_name)); | |
1063 return name; | |
1064 } else { | |
1065 return NULL; | |
1066 } | |
1067 } | |
1068 | |
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1069 // extract the JRE version from sun.misc.Version.java_runtime_version |
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1070 static const char* get_java_runtime_version(TRAPS) { |
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1071 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
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1072 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
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1073 fieldDescriptor fd; |
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1074 bool found = k != NULL && |
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1075 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_version_name(), |
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1076 vmSymbols::string_signature(), &fd); |
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1077 if (found) { |
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1078 oop name_oop = k->java_mirror()->obj_field(fd.offset()); |
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1079 if (name_oop == NULL) |
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1080 return NULL; |
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1081 const char* name = java_lang_String::as_utf8_string(name_oop, |
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1082 java_runtime_version, |
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1083 sizeof(java_runtime_version)); |
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1084 return name; |
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1085 } else { |
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1086 return NULL; |
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1087 } |
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1088 } |
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1089 |
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1090 // General purpose hook into Java code, run once when the VM is initialized. |
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1091 // The Java library method itself may be changed independently from the VM. |
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1092 static void call_postVMInitHook(TRAPS) { |
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1093 Klass* k = SystemDictionary::PostVMInitHook_klass(); |
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1094 instanceKlassHandle klass (THREAD, k); |
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1095 if (klass.not_null()) { |
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1096 JavaValue result(T_VOID); |
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1097 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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1098 vmSymbols::void_method_signature(), |
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1099 CHECK); |
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1100 } |
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1101 } |
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1102 |
0 | 1103 static void reset_vm_info_property(TRAPS) { |
1104 // the vm info string | |
1105 ResourceMark rm(THREAD); | |
1106 const char *vm_info = VM_Version::vm_info_string(); | |
1107 | |
1108 // java.lang.System class | |
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1109 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 1110 instanceKlassHandle klass (THREAD, k); |
1111 | |
1112 // setProperty arguments | |
1113 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
1114 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
1115 | |
1116 // return value | |
1117 JavaValue r(T_OBJECT); | |
1118 | |
1119 // public static String setProperty(String key, String value); | |
1120 JavaCalls::call_static(&r, | |
1121 klass, | |
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1122 vmSymbols::setProperty_name(), |
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1123 vmSymbols::string_string_string_signature(), |
0 | 1124 key_str, |
1125 value_str, | |
1126 CHECK); | |
1127 } | |
1128 | |
1129 | |
1130 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
1131 assert(thread_group.not_null(), "thread group should be specified"); | |
1132 assert(threadObj() == NULL, "should only create Java thread object once"); | |
1133 | |
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1134 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
0 | 1135 instanceKlassHandle klass (THREAD, k); |
1136 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
1137 | |
1138 java_lang_Thread::set_thread(thread_oop(), this); | |
1139 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1140 set_threadObj(thread_oop()); | |
1141 | |
1142 JavaValue result(T_VOID); | |
1143 if (thread_name != NULL) { | |
1144 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
1145 // Thread gets assigned specified name and null target | |
1146 JavaCalls::call_special(&result, | |
1147 thread_oop, | |
1148 klass, | |
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1149 vmSymbols::object_initializer_name(), |
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1150 vmSymbols::threadgroup_string_void_signature(), |
0 | 1151 thread_group, // Argument 1 |
1152 name, // Argument 2 | |
1153 THREAD); | |
1154 } else { | |
1155 // Thread gets assigned name "Thread-nnn" and null target | |
1156 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
1157 JavaCalls::call_special(&result, | |
1158 thread_oop, | |
1159 klass, | |
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1160 vmSymbols::object_initializer_name(), |
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1161 vmSymbols::threadgroup_runnable_void_signature(), |
0 | 1162 thread_group, // Argument 1 |
1163 Handle(), // Argument 2 | |
1164 THREAD); | |
1165 } | |
1166 | |
1167 | |
1168 if (daemon) { | |
1169 java_lang_Thread::set_daemon(thread_oop()); | |
1170 } | |
1171 | |
1172 if (HAS_PENDING_EXCEPTION) { | |
1173 return; | |
1174 } | |
1175 | |
1142 | 1176 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
0 | 1177 Handle threadObj(this, this->threadObj()); |
1178 | |
1179 JavaCalls::call_special(&result, | |
1180 thread_group, | |
1181 group, | |
2177
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1182 vmSymbols::add_method_name(), |
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1183 vmSymbols::thread_void_signature(), |
0 | 1184 threadObj, // Arg 1 |
1185 THREAD); | |
1186 | |
1187 | |
1188 } | |
1189 | |
1190 // NamedThread -- non-JavaThread subclasses with multiple | |
1191 // uniquely named instances should derive from this. | |
1192 NamedThread::NamedThread() : Thread() { | |
1193 _name = NULL; | |
1119
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1194 _processed_thread = NULL; |
0 | 1195 } |
1196 | |
1197 NamedThread::~NamedThread() { | |
1198 if (_name != NULL) { | |
6197 | 1199 FREE_C_HEAP_ARRAY(char, _name, mtThread); |
0 | 1200 _name = NULL; |
1201 } | |
1202 } | |
1203 | |
1204 void NamedThread::set_name(const char* format, ...) { | |
1205 guarantee(_name == NULL, "Only get to set name once."); | |
6197 | 1206 _name = NEW_C_HEAP_ARRAY(char, max_name_len, mtThread); |
0 | 1207 guarantee(_name != NULL, "alloc failure"); |
1208 va_list ap; | |
1209 va_start(ap, format); | |
1210 jio_vsnprintf(_name, max_name_len, format, ap); | |
1211 va_end(ap); | |
1212 } | |
1213 | |
1214 // ======= WatcherThread ======== | |
1215 | |
1216 // The watcher thread exists to simulate timer interrupts. It should | |
1217 // be replaced by an abstraction over whatever native support for | |
1218 // timer interrupts exists on the platform. | |
1219 | |
1220 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
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1221 bool WatcherThread::_startable = false; |
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1222 volatile bool WatcherThread::_should_terminate = false; |
0 | 1223 |
1224 WatcherThread::WatcherThread() : Thread() { | |
1225 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
1226 if (os::create_thread(this, os::watcher_thread)) { | |
1227 _watcher_thread = this; | |
1228 | |
1229 // Set the watcher thread to the highest OS priority which should not be | |
1230 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
1231 // is created. The only normal thread using this priority is the reference | |
1232 // handler thread, which runs for very short intervals only. | |
1233 // If the VMThread's priority is not lower than the WatcherThread profiling | |
1234 // will be inaccurate. | |
1235 os::set_priority(this, MaxPriority); | |
1236 if (!DisableStartThread) { | |
1237 os::start_thread(this); | |
1238 } | |
1239 } | |
1240 } | |
1241 | |
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1242 int WatcherThread::sleep() const { |
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1243 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1244 |
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1245 // remaining will be zero if there are no tasks, |
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1246 // causing the WatcherThread to sleep until a task is |
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1247 // enrolled |
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1248 int remaining = PeriodicTask::time_to_wait(); |
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1249 int time_slept = 0; |
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1250 |
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1251 // we expect this to timeout - we only ever get unparked when |
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1252 // we should terminate or when a new task has been enrolled |
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1253 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1254 |
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1255 jlong time_before_loop = os::javaTimeNanos(); |
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1256 |
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1257 for (;;) { |
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1258 bool timedout = PeriodicTask_lock->wait(Mutex::_no_safepoint_check_flag, remaining); |
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1259 jlong now = os::javaTimeNanos(); |
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1260 |
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1261 if (remaining == 0) { |
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1262 // if we didn't have any tasks we could have waited for a long time |
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1263 // consider the time_slept zero and reset time_before_loop |
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1264 time_slept = 0; |
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1265 time_before_loop = now; |
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1266 } else { |
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1267 // need to recalulate since we might have new tasks in _tasks |
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1268 time_slept = (int) ((now - time_before_loop) / 1000000); |
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1269 } |
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1270 |
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1271 // Change to task list or spurious wakeup of some kind |
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1272 if (timedout || _should_terminate) { |
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1273 break; |
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1274 } |
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1275 |
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1276 remaining = PeriodicTask::time_to_wait(); |
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1277 if (remaining == 0) { |
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1278 // Last task was just disenrolled so loop around and wait until |
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1279 // another task gets enrolled |
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1280 continue; |
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1281 } |
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1282 |
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1283 remaining -= time_slept; |
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1284 if (remaining <= 0) |
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1285 break; |
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1286 } |
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1287 |
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1288 return time_slept; |
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1289 } |
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1290 |
0 | 1291 void WatcherThread::run() { |
1292 assert(this == watcher_thread(), "just checking"); | |
1293 | |
1294 this->record_stack_base_and_size(); | |
1295 this->initialize_thread_local_storage(); | |
1296 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1297 while(!_should_terminate) { | |
1298 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
1299 assert(watcher_thread() == this, "thread consistency check"); | |
1300 | |
1301 // Calculate how long it'll be until the next PeriodicTask work | |
1302 // should be done, and sleep that amount of time. | |
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1303 int time_waited = sleep(); |
0 | 1304 |
1305 if (is_error_reported()) { | |
1306 // A fatal error has happened, the error handler(VMError::report_and_die) | |
1307 // should abort JVM after creating an error log file. However in some | |
1308 // rare cases, the error handler itself might deadlock. Here we try to | |
1309 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
1310 // | |
1311 // This code is in WatcherThread because WatcherThread wakes up | |
1312 // periodically so the fatal error handler doesn't need to do anything; | |
1313 // also because the WatcherThread is less likely to crash than other | |
1314 // threads. | |
1315 | |
1316 for (;;) { | |
1317 if (!ShowMessageBoxOnError | |
1318 && (OnError == NULL || OnError[0] == '\0') | |
1319 && Arguments::abort_hook() == NULL) { | |
1320 os::sleep(this, 2 * 60 * 1000, false); | |
1321 fdStream err(defaultStream::output_fd()); | |
1322 err.print_raw_cr("# [ timer expired, abort... ]"); | |
1323 // skip atexit/vm_exit/vm_abort hooks | |
1324 os::die(); | |
1325 } | |
1326 | |
1327 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
1328 // ShowMessageBoxOnError when it is ready to abort. | |
1329 os::sleep(this, 5 * 1000, false); | |
1330 } | |
1331 } | |
1332 | |
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1333 PeriodicTask::real_time_tick(time_waited); |
0 | 1334 } |
1335 | |
1336 // Signal that it is terminated | |
1337 { | |
1338 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
1339 _watcher_thread = NULL; | |
1340 Terminator_lock->notify(); | |
1341 } | |
1342 | |
1343 // Thread destructor usually does this.. | |
1344 ThreadLocalStorage::set_thread(NULL); | |
1345 } | |
1346 | |
1347 void WatcherThread::start() { | |
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1348 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); |
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1349 |
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1350 if (watcher_thread() == NULL && _startable) { |
0 | 1351 _should_terminate = false; |
1352 // Create the single instance of WatcherThread | |
1353 new WatcherThread(); | |
1354 } | |
1355 } | |
1356 | |
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1357 void WatcherThread::make_startable() { |
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1358 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); |
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1359 _startable = true; |
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1360 } |
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1361 |
0 | 1362 void WatcherThread::stop() { |
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1363 { |
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1364 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1365 _should_terminate = true; |
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1366 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1367 |
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1368 WatcherThread* watcher = watcher_thread(); |
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1369 if (watcher != NULL) |
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1370 watcher->unpark(); |
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1371 } |
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1372 |
0 | 1373 // it is ok to take late safepoints here, if needed |
1374 MutexLocker mu(Terminator_lock); | |
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1375 |
0 | 1376 while(watcher_thread() != NULL) { |
1377 // This wait should make safepoint checks, wait without a timeout, | |
1378 // and wait as a suspend-equivalent condition. | |
1379 // | |
1380 // Note: If the FlatProfiler is running, then this thread is waiting | |
1381 // for the WatcherThread to terminate and the WatcherThread, via the | |
1382 // FlatProfiler task, is waiting for the external suspend request on | |
1383 // this thread to complete. wait_for_ext_suspend_completion() will | |
1384 // eventually timeout, but that takes time. Making this wait a | |
1385 // suspend-equivalent condition solves that timeout problem. | |
1386 // | |
1387 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
1388 Mutex::_as_suspend_equivalent_flag); | |
1389 } | |
1390 } | |
1391 | |
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1392 void WatcherThread::unpark() { |
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1393 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ? NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1394 PeriodicTask_lock->notify(); |
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1395 } |
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1396 |
0 | 1397 void WatcherThread::print_on(outputStream* st) const { |
1398 st->print("\"%s\" ", name()); | |
1399 Thread::print_on(st); | |
1400 st->cr(); | |
1401 } | |
1402 | |
1403 // ======= JavaThread ======== | |
1404 | |
1405 // A JavaThread is a normal Java thread | |
1406 | |
1407 void JavaThread::initialize() { | |
1408 // Initialize fields | |
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1409 |
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1410 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1411 set_claimed_par_id(-1); |
3555
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1412 |
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1413 _env = NULL; |
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1414 _buffer_blob = NULL; |
0 | 1415 set_saved_exception_pc(NULL); |
1416 set_threadObj(NULL); | |
1417 _anchor.clear(); | |
1418 set_entry_point(NULL); | |
1419 set_jni_functions(jni_functions()); | |
1420 set_callee_target(NULL); | |
1421 set_vm_result(NULL); | |
1422 set_vm_result_2(NULL); | |
1423 set_vframe_array_head(NULL); | |
1424 set_vframe_array_last(NULL); | |
1425 set_deferred_locals(NULL); | |
1426 set_deopt_mark(NULL); | |
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1427 set_deopt_nmethod(NULL); |
0 | 1428 clear_must_deopt_id(); |
1429 set_monitor_chunks(NULL); | |
1430 set_next(NULL); | |
1431 set_thread_state(_thread_new); | |
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1432 #if INCLUDE_NMT |
6197 | 1433 set_recorder(NULL); |
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|
1434 #endif |
0 | 1435 _terminated = _not_terminated; |
1436 _privileged_stack_top = NULL; | |
1437 _array_for_gc = NULL; | |
1438 _suspend_equivalent = false; | |
1439 _in_deopt_handler = 0; | |
1440 _doing_unsafe_access = false; | |
1441 _stack_guard_state = stack_guard_unused; | |
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1442 #ifdef GRAAL |
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|
1443 _graal_alternate_call_target = NULL; |
6999
679e6584c177
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Doug Simon <doug.simon@oracle.com>
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|
1444 _debug_scope = NULL; |
5747
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diff
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|
1445 #endif |
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parents:
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|
1446 #ifdef HIGH_LEVEL_INTERPRETER |
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|
1447 _high_level_interpreter_in_vm = false; |
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Christian Haeubl <haeubl@ssw.jku.at>
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|
1448 #endif |
0 | 1449 _exception_oop = NULL; |
1450 _exception_pc = 0; | |
1451 _exception_handler_pc = 0; | |
1903 | 1452 _is_method_handle_return = 0; |
0 | 1453 _jvmti_thread_state= NULL; |
1213
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diff
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|
1454 _should_post_on_exceptions_flag = JNI_FALSE; |
0 | 1455 _jvmti_get_loaded_classes_closure = NULL; |
1456 _interp_only_mode = 0; | |
1457 _special_runtime_exit_condition = _no_async_condition; | |
1458 _pending_async_exception = NULL; | |
1459 _is_compiling = false; | |
1460 _thread_stat = NULL; | |
1461 _thread_stat = new ThreadStatistics(); | |
1462 _blocked_on_compilation = false; | |
1463 _jni_active_critical = 0; | |
1464 _do_not_unlock_if_synchronized = false; | |
1465 _cached_monitor_info = NULL; | |
1466 _parker = Parker::Allocate(this) ; | |
3696
dc7902820c9b
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Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
1467 _scanned_nmethod = NULL; |
0 | 1468 |
1469 #ifndef PRODUCT | |
1470 _jmp_ring_index = 0; | |
1471 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
1472 record_jump(NULL, NULL, NULL, 0); | |
1473 } | |
1474 #endif /* PRODUCT */ | |
1475 | |
1476 set_thread_profiler(NULL); | |
1477 if (FlatProfiler::is_active()) { | |
1478 // This is where we would decide to either give each thread it's own profiler | |
1479 // or use one global one from FlatProfiler, | |
1480 // or up to some count of the number of profiled threads, etc. | |
1481 ThreadProfiler* pp = new ThreadProfiler(); | |
1482 pp->engage(); | |
1483 set_thread_profiler(pp); | |
1484 } | |
1485 | |
1486 // Setup safepoint state info for this thread | |
1487 ThreadSafepointState::create(this); | |
1488 | |
1489 debug_only(_java_call_counter = 0); | |
1490 | |
1491 // JVMTI PopFrame support | |
1492 _popframe_condition = popframe_inactive; | |
1493 _popframe_preserved_args = NULL; | |
1494 _popframe_preserved_args_size = 0; | |
1495 | |
1496 pd_initialize(); | |
1497 } | |
1498 | |
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|
1499 #if INCLUDE_ALL_GCS |
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|
1500 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
37f87013dfd8
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diff
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|
1501 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
8001
db9981fd3124
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|
1502 #endif // INCLUDE_ALL_GCS |
342
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|
1503 |
4006 | 1504 JavaThread::JavaThread(bool is_attaching_via_jni) : |
342
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diff
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|
1505 Thread() |
8001
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|
1506 #if INCLUDE_ALL_GCS |
342
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|
1507 , _satb_mark_queue(&_satb_mark_queue_set), |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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parents:
62
diff
changeset
|
1508 _dirty_card_queue(&_dirty_card_queue_set) |
8001
db9981fd3124
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|
1509 #endif // INCLUDE_ALL_GCS |
342
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|
1510 { |
0 | 1511 initialize(); |
4006 | 1512 if (is_attaching_via_jni) { |
1513 _jni_attach_state = _attaching_via_jni; | |
1514 } else { | |
1515 _jni_attach_state = _not_attaching_via_jni; | |
1516 } | |
8011
06fd03af6ce4
8001384: G1: assert(!is_null(v)) failed: narrow oop value can never be zero
johnc
parents:
7615
diff
changeset
|
1517 assert(deferred_card_mark().is_empty(), "Default MemRegion ctor"); |
6197 | 1518 _safepoint_visible = false; |
0 | 1519 } |
1520 | |
1521 bool JavaThread::reguard_stack(address cur_sp) { | |
1522 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
1523 return true; // Stack already guarded or guard pages not needed. | |
1524 } | |
1525 | |
1526 if (register_stack_overflow()) { | |
1527 // For those architectures which have separate register and | |
1528 // memory stacks, we must check the register stack to see if | |
1529 // it has overflowed. | |
1530 return false; | |
1531 } | |
1532 | |
1533 // Java code never executes within the yellow zone: the latter is only | |
1534 // there to provoke an exception during stack banging. If java code | |
1535 // is executing there, either StackShadowPages should be larger, or | |
1536 // some exception code in c1, c2 or the interpreter isn't unwinding | |
1537 // when it should. | |
1538 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
1539 | |
1540 enable_stack_yellow_zone(); | |
1541 return true; | |
1542 } | |
1543 | |
1544 bool JavaThread::reguard_stack(void) { | |
1545 return reguard_stack(os::current_stack_pointer()); | |
1546 } | |
1547 | |
1548 | |
1549 void JavaThread::block_if_vm_exited() { | |
1550 if (_terminated == _vm_exited) { | |
1551 // _vm_exited is set at safepoint, and Threads_lock is never released | |
1552 // we will block here forever | |
1553 Threads_lock->lock_without_safepoint_check(); | |
1554 ShouldNotReachHere(); | |
1555 } | |
1556 } | |
1557 | |
1558 | |
1559 // Remove this ifdef when C1 is ported to the compiler interface. | |
1560 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
1561 | |
342
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|
1562 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
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62
diff
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|
1563 Thread() |
8001
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|
1564 #if INCLUDE_ALL_GCS |
342
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|
1565 , _satb_mark_queue(&_satb_mark_queue_set), |
37f87013dfd8
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diff
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|
1566 _dirty_card_queue(&_dirty_card_queue_set) |
8001
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|
1567 #endif // INCLUDE_ALL_GCS |
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|
1568 { |
0 | 1569 if (TraceThreadEvents) { |
1570 tty->print_cr("creating thread %p", this); | |
1571 } | |
1572 initialize(); | |
4006 | 1573 _jni_attach_state = _not_attaching_via_jni; |
0 | 1574 set_entry_point(entry_point); |
1575 // Create the native thread itself. | |
1576 // %note runtime_23 | |
1577 os::ThreadType thr_type = os::java_thread; | |
1578 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
1579 os::java_thread; | |
1580 os::create_thread(this, thr_type, stack_sz); | |
6197 | 1581 _safepoint_visible = false; |
0 | 1582 // The _osthread may be NULL here because we ran out of memory (too many threads active). |
1583 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
1584 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
1585 // the exception consists of creating the exception object & initializing it, initialization | |
1586 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
1587 // | |
1588 // The thread is still suspended when we reach here. Thread must be explicit started | |
1589 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
1590 // by calling Threads:add. The reason why this is not done here, is because the thread | |
1591 // object must be fully initialized (take a look at JVM_Start) | |
1592 } | |
1593 | |
1594 JavaThread::~JavaThread() { | |
1595 if (TraceThreadEvents) { | |
1596 tty->print_cr("terminate thread %p", this); | |
1597 } | |
1598 | |
6882
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6872
diff
changeset
|
1599 // By now, this thread should already be invisible to safepoint, |
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
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diff
changeset
|
1600 // and its per-thread recorder also collected. |
6197 | 1601 assert(!is_safepoint_visible(), "wrong state"); |
6882
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6872
diff
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|
1602 #if INCLUDE_NMT |
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6872
diff
changeset
|
1603 assert(get_recorder() == NULL, "Already collected"); |
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6872
diff
changeset
|
1604 #endif // INCLUDE_NMT |
6197 | 1605 |
0 | 1606 // JSR166 -- return the parker to the free list |
1607 Parker::Release(_parker); | |
1608 _parker = NULL ; | |
1609 | |
1610 // Free any remaining previous UnrollBlock | |
1611 vframeArray* old_array = vframe_array_last(); | |
1612 | |
1613 if (old_array != NULL) { | |
1614 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
1615 old_array->set_unroll_block(NULL); | |
1616 delete old_info; | |
1617 delete old_array; | |
1618 } | |
1619 | |
1620 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
1621 if (deferred != NULL) { | |
1622 // This can only happen if thread is destroyed before deoptimization occurs. | |
1623 assert(deferred->length() != 0, "empty array!"); | |
1624 do { | |
1625 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
1626 deferred->remove_at(0); | |
1627 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
1628 delete dlv; | |
1629 } while (deferred->length() != 0); | |
1630 delete deferred; | |
1631 } | |
1632 | |
1633 // All Java related clean up happens in exit | |
1634 ThreadSafepointState::destroy(this); | |
1635 if (_thread_profiler != NULL) delete _thread_profiler; | |
1636 if (_thread_stat != NULL) delete _thread_stat; | |
1637 } | |
1638 | |
1639 | |
1640 // The first routine called by a new Java thread | |
1641 void JavaThread::run() { | |
1642 // initialize thread-local alloc buffer related fields | |
1643 this->initialize_tlab(); | |
1644 | |
1645 // used to test validitity of stack trace backs | |
1646 this->record_base_of_stack_pointer(); | |
1647 | |
1648 // Record real stack base and size. | |
1649 this->record_stack_base_and_size(); | |
1650 | |
1651 // Initialize thread local storage; set before calling MutexLocker | |
1652 this->initialize_thread_local_storage(); | |
1653 | |
1654 this->create_stack_guard_pages(); | |
1655 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
1656 this->cache_global_variables(); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
1657 |
0 | 1658 // Thread is now sufficient initialized to be handled by the safepoint code as being |
1659 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
1660 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
1661 | |
1662 assert(JavaThread::current() == this, "sanity check"); | |
1663 assert(!Thread::current()->owns_locks(), "sanity check"); | |
1664 | |
1665 DTRACE_THREAD_PROBE(start, this); | |
1666 | |
1667 // This operation might block. We call that after all safepoint checks for a new thread has | |
1668 // been completed. | |
1669 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1670 | |
1671 if (JvmtiExport::should_post_thread_life()) { | |
1672 JvmtiExport::post_thread_start(this); | |
1673 } | |
1674 | |
4800
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
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parents:
4095
diff
changeset
|
1675 EVENT_BEGIN(TraceEventThreadStart, event); |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
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parents:
4095
diff
changeset
|
1676 EVENT_COMMIT(event, |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
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4095
diff
changeset
|
1677 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
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4095
diff
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|
1678 |
0 | 1679 // We call another function to do the rest so we are sure that the stack addresses used |
1680 // from there will be lower than the stack base just computed | |
1681 thread_main_inner(); | |
1682 | |
1683 // Note, thread is no longer valid at this point! | |
1684 } | |
1685 | |
1686 | |
1687 void JavaThread::thread_main_inner() { | |
1688 assert(JavaThread::current() == this, "sanity check"); | |
1689 assert(this->threadObj() != NULL, "just checking"); | |
1690 | |
2162
ccfcb502af3f
6566340: Restore use of stillborn flag to signify a thread that was stopped before it started
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diff
changeset
|
1691 // Execute thread entry point unless this thread has a pending exception |
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6566340: Restore use of stillborn flag to signify a thread that was stopped before it started
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diff
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|
1692 // or has been stopped before starting. |
0 | 1693 // Note: Due to JVM_StopThread we can have pending exceptions already! |
2162
ccfcb502af3f
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diff
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|
1694 if (!this->has_pending_exception() && |
ccfcb502af3f
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dholmes
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2129
diff
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|
1695 !java_lang_Thread::is_stillborn(this->threadObj())) { |
4006 | 1696 { |
1697 ResourceMark rm(this); | |
1698 this->set_native_thread_name(this->get_thread_name()); | |
1699 } | |
0 | 1700 HandleMark hm(this); |
1701 this->entry_point()(this, this); | |
1702 } | |
1703 | |
1704 DTRACE_THREAD_PROBE(stop, this); | |
1705 | |
1706 this->exit(false); | |
1707 delete this; | |
1708 } | |
1709 | |
1710 | |
1711 static void ensure_join(JavaThread* thread) { | |
1712 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
1713 Handle threadObj(thread, thread->threadObj()); | |
1714 assert(threadObj.not_null(), "java thread object must exist"); | |
1715 ObjectLocker lock(threadObj, thread); | |
1716 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1717 thread->clear_pending_exception(); | |
1718 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
1719 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
2162
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|
1720 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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|
1721 // to complete once we've done the notify_all below |
0 | 1722 java_lang_Thread::set_thread(threadObj(), NULL); |
1723 lock.notify_all(thread); | |
1724 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1725 thread->clear_pending_exception(); | |
1726 } | |
1727 | |
441
da9cb4e97a5f
6770608: G1: Mutator thread can flush barrier and satb queues during safepoint
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383
diff
changeset
|
1728 |
0 | 1729 // For any new cleanup additions, please check to see if they need to be applied to |
1730 // cleanup_failed_attach_current_thread as well. | |
1731 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
1732 assert(this == JavaThread::current(), "thread consistency check"); | |
1733 | |
1734 HandleMark hm(this); | |
1735 Handle uncaught_exception(this, this->pending_exception()); | |
1736 this->clear_pending_exception(); | |
1737 Handle threadObj(this, this->threadObj()); | |
1738 assert(threadObj.not_null(), "Java thread object should be created"); | |
1739 | |
1740 if (get_thread_profiler() != NULL) { | |
1741 get_thread_profiler()->disengage(); | |
1742 ResourceMark rm; | |
1743 get_thread_profiler()->print(get_thread_name()); | |
1744 } | |
1745 | |
1746 | |
1747 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
1748 { | |
1749 EXCEPTION_MARK; | |
1750 | |
1751 CLEAR_PENDING_EXCEPTION; | |
1752 } | |
1753 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
1754 // has to be fixed by a runtime query method | |
1755 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
1756 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
1757 // java.lang.Thread.dispatchUncaughtException | |
1758 if (uncaught_exception.not_null()) { | |
1759 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
1760 { | |
1761 EXCEPTION_MARK; | |
1762 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
1763 // call it. Otherwise we have an older library without the JSR-166 changes, | |
1764 // so call ThreadGroup.uncaughtException() | |
1765 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
1766 CallInfo callinfo; | |
1142 | 1767 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1768 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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2162
diff
changeset
|
1769 vmSymbols::dispatchUncaughtException_name(), |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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2162
diff
changeset
|
1770 vmSymbols::throwable_void_signature(), |
0 | 1771 KlassHandle(), false, false, THREAD); |
1772 CLEAR_PENDING_EXCEPTION; | |
1773 methodHandle method = callinfo.selected_method(); | |
1774 if (method.not_null()) { | |
1775 JavaValue result(T_VOID); | |
1776 JavaCalls::call_virtual(&result, | |
1777 threadObj, thread_klass, | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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diff
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|
1778 vmSymbols::dispatchUncaughtException_name(), |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
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2162
diff
changeset
|
1779 vmSymbols::throwable_void_signature(), |
0 | 1780 uncaught_exception, |
1781 THREAD); | |
1782 } else { | |
1142 | 1783 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
0 | 1784 JavaValue result(T_VOID); |
1785 JavaCalls::call_virtual(&result, | |
1786 group, thread_group, | |
2177
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diff
changeset
|
1787 vmSymbols::uncaughtException_name(), |
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coleenp
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diff
changeset
|
1788 vmSymbols::thread_throwable_void_signature(), |
0 | 1789 threadObj, // Arg 1 |
1790 uncaught_exception, // Arg 2 | |
1791 THREAD); | |
1792 } | |
2200
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1793 if (HAS_PENDING_EXCEPTION) { |
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1794 ResourceMark rm(this); |
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1795 jio_fprintf(defaultStream::error_stream(), |
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1796 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1797 " in thread \"%s\"\n", |
6983 | 1798 pending_exception()->klass()->external_name(), |
2200
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1799 get_thread_name()); |
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1800 CLEAR_PENDING_EXCEPTION; |
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1801 } |
0 | 1802 } |
1803 } | |
1804 | |
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1805 // Called before the java thread exit since we want to read info |
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1806 // from java_lang_Thread object |
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1807 EVENT_BEGIN(TraceEventThreadEnd, event); |
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1808 EVENT_COMMIT(event, |
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1809 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1810 |
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1811 // Call after last event on thread |
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1812 EVENT_THREAD_EXIT(this); |
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1813 |
0 | 1814 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during |
1815 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
1816 // is deprecated anyhow. | |
1817 { int count = 3; | |
1818 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
1819 EXCEPTION_MARK; | |
1820 JavaValue result(T_VOID); | |
1142 | 1821 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1822 JavaCalls::call_virtual(&result, |
1823 threadObj, thread_klass, | |
2177
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1824 vmSymbols::exit_method_name(), |
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1825 vmSymbols::void_method_signature(), |
0 | 1826 THREAD); |
1827 CLEAR_PENDING_EXCEPTION; | |
1828 } | |
1829 } | |
1830 | |
1831 // notify JVMTI | |
1832 if (JvmtiExport::should_post_thread_life()) { | |
1833 JvmtiExport::post_thread_end(this); | |
1834 } | |
1835 | |
1836 // We have notified the agents that we are exiting, before we go on, | |
1837 // we must check for a pending external suspend request and honor it | |
1838 // in order to not surprise the thread that made the suspend request. | |
1839 while (true) { | |
1840 { | |
1841 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1842 if (!is_external_suspend()) { | |
1843 set_terminated(_thread_exiting); | |
1844 ThreadService::current_thread_exiting(this); | |
1845 break; | |
1846 } | |
1847 // Implied else: | |
1848 // Things get a little tricky here. We have a pending external | |
1849 // suspend request, but we are holding the SR_lock so we | |
1850 // can't just self-suspend. So we temporarily drop the lock | |
1851 // and then self-suspend. | |
1852 } | |
1853 | |
1854 ThreadBlockInVM tbivm(this); | |
1855 java_suspend_self(); | |
1856 | |
1857 // We're done with this suspend request, but we have to loop around | |
1858 // and check again. Eventually we will get SR_lock without a pending | |
1859 // external suspend request and will be able to mark ourselves as | |
1860 // exiting. | |
1861 } | |
1862 // no more external suspends are allowed at this point | |
1863 } else { | |
1864 // before_exit() has already posted JVMTI THREAD_END events | |
1865 } | |
1866 | |
1867 // Notify waiters on thread object. This has to be done after exit() is called | |
1868 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
1869 // group should have the destroyed bit set before waiters are notified). | |
1870 ensure_join(this); | |
1871 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
1872 | |
1873 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
1874 // held by this thread must be released. A detach operation must only | |
1875 // get here if there are no Java frames on the stack. Therefore, any | |
1876 // owned monitors at this point MUST be JNI-acquired monitors which are | |
1877 // pre-inflated and in the monitor cache. | |
1878 // | |
1879 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
1880 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
1881 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
1882 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
1883 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
1884 } | |
1885 | |
1886 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
1887 // is in a consistent state, in case GC happens | |
1888 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
1889 | |
1890 if (active_handles() != NULL) { | |
1891 JNIHandleBlock* block = active_handles(); | |
1892 set_active_handles(NULL); | |
1893 JNIHandleBlock::release_block(block); | |
1894 } | |
1895 | |
1896 if (free_handle_block() != NULL) { | |
1897 JNIHandleBlock* block = free_handle_block(); | |
1898 set_free_handle_block(NULL); | |
1899 JNIHandleBlock::release_block(block); | |
1900 } | |
1901 | |
1902 // These have to be removed while this is still a valid thread. | |
1903 remove_stack_guard_pages(); | |
1904 | |
1905 if (UseTLAB) { | |
1906 tlab().make_parsable(true); // retire TLAB | |
1907 } | |
1908 | |
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1909 if (JvmtiEnv::environments_might_exist()) { |
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1910 JvmtiExport::cleanup_thread(this); |
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1911 } |
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1912 |
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1913 // We must flush any deferred card marks before removing a thread from |
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1914 // the list of active threads. |
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1915 Universe::heap()->flush_deferred_store_barrier(this); |
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1916 assert(deferred_card_mark().is_empty(), "Should have been flushed"); |
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1917 |
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1918 #if INCLUDE_ALL_GCS |
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1919 // We must flush the G1-related buffers before removing a thread |
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1920 // from the list of active threads. We must do this after any deferred |
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1921 // card marks have been flushed (above) so that any entries that are |
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1922 // added to the thread's dirty card queue as a result are not lost. |
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1923 if (UseG1GC) { |
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1924 flush_barrier_queues(); |
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1925 } |
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1926 #endif // INCLUDE_ALL_GCS |
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1927 |
0 | 1928 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
1929 Threads::remove(this); | |
1930 } | |
1931 | |
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1932 #if INCLUDE_ALL_GCS |
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1933 // Flush G1-related queues. |
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1934 void JavaThread::flush_barrier_queues() { |
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1935 satb_mark_queue().flush(); |
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1936 dirty_card_queue().flush(); |
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1937 } |
1842
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1938 |
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1939 void JavaThread::initialize_queues() { |
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1940 assert(!SafepointSynchronize::is_at_safepoint(), |
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1941 "we should not be at a safepoint"); |
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1942 |
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1943 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1944 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1945 // The SATB queue should have been constructed with its active |
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1946 // field set to false. |
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1947 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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1948 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1949 // If we are creating the thread during a marking cycle, we should |
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1950 // set the active field of the SATB queue to true. |
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1951 if (satb_queue_set.is_active()) { |
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1952 satb_queue.set_active(true); |
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1953 } |
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1954 |
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1955 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1956 // The dirty card queue should have been constructed with its |
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1957 // active field set to true. |
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1958 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1959 } |
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1960 #endif // INCLUDE_ALL_GCS |
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1961 |
0 | 1962 void JavaThread::cleanup_failed_attach_current_thread() { |
441
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1963 if (get_thread_profiler() != NULL) { |
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1964 get_thread_profiler()->disengage(); |
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1965 ResourceMark rm; |
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1966 get_thread_profiler()->print(get_thread_name()); |
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1967 } |
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1968 |
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1969 if (active_handles() != NULL) { |
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1970 JNIHandleBlock* block = active_handles(); |
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1971 set_active_handles(NULL); |
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1972 JNIHandleBlock::release_block(block); |
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1973 } |
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1974 |
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1975 if (free_handle_block() != NULL) { |
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1976 JNIHandleBlock* block = free_handle_block(); |
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1977 set_free_handle_block(NULL); |
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1978 JNIHandleBlock::release_block(block); |
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1979 } |
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1980 |
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1981 // These have to be removed while this is still a valid thread. |
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1982 remove_stack_guard_pages(); |
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1983 |
441
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1984 if (UseTLAB) { |
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1985 tlab().make_parsable(true); // retire TLAB, if any |
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1986 } |
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1987 |
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1988 #if INCLUDE_ALL_GCS |
441
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1989 if (UseG1GC) { |
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1990 flush_barrier_queues(); |
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|
1991 } |
8001
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|
1992 #endif // INCLUDE_ALL_GCS |
441
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|
1993 |
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|
1994 Threads::remove(this); |
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|
1995 delete this; |
0 | 1996 } |
1997 | |
1998 | |
441
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|
1999 |
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|
2000 |
0 | 2001 JavaThread* JavaThread::active() { |
2002 Thread* thread = ThreadLocalStorage::thread(); | |
2003 assert(thread != NULL, "just checking"); | |
2004 if (thread->is_Java_thread()) { | |
2005 return (JavaThread*) thread; | |
2006 } else { | |
2007 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
2008 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
2009 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
2010 assert(ret->is_Java_thread(), "must be a Java thread"); | |
2011 return ret; | |
2012 } | |
2013 } | |
2014 | |
2015 bool JavaThread::is_lock_owned(address adr) const { | |
702
b9fba36710f2
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669
diff
changeset
|
2016 if (Thread::is_lock_owned(adr)) return true; |
0 | 2017 |
2018 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
2019 if (chunk->contains(adr)) return true; | |
2020 } | |
2021 | |
2022 return false; | |
2023 } | |
2024 | |
2025 | |
2026 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
2027 chunk->set_next(monitor_chunks()); | |
2028 set_monitor_chunks(chunk); | |
2029 } | |
2030 | |
2031 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
2032 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
2033 if (monitor_chunks() == chunk) { | |
2034 set_monitor_chunks(chunk->next()); | |
2035 } else { | |
2036 MonitorChunk* prev = monitor_chunks(); | |
2037 while (prev->next() != chunk) prev = prev->next(); | |
2038 prev->set_next(chunk->next()); | |
2039 } | |
2040 } | |
2041 | |
2042 // JVM support. | |
2043 | |
2044 // Note: this function shouldn't block if it's called in | |
2045 // _thread_in_native_trans state (such as from | |
2046 // check_special_condition_for_native_trans()). | |
2047 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
2048 | |
2049 if (has_last_Java_frame() && has_async_condition()) { | |
2050 // If we are at a polling page safepoint (not a poll return) | |
2051 // then we must defer async exception because live registers | |
2052 // will be clobbered by the exception path. Poll return is | |
2053 // ok because the call we a returning from already collides | |
2054 // with exception handling registers and so there is no issue. | |
2055 // (The exception handling path kills call result registers but | |
2056 // this is ok since the exception kills the result anyway). | |
2057 | |
2058 if (is_at_poll_safepoint()) { | |
2059 // if the code we are returning to has deoptimized we must defer | |
2060 // the exception otherwise live registers get clobbered on the | |
2061 // exception path before deoptimization is able to retrieve them. | |
2062 // | |
2063 RegisterMap map(this, false); | |
2064 frame caller_fr = last_frame().sender(&map); | |
2065 assert(caller_fr.is_compiled_frame(), "what?"); | |
2066 if (caller_fr.is_deoptimized_frame()) { | |
2067 if (TraceExceptions) { | |
2068 ResourceMark rm; | |
2069 tty->print_cr("deferred async exception at compiled safepoint"); | |
2070 } | |
2071 return; | |
2072 } | |
2073 } | |
2074 } | |
2075 | |
2076 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
2077 if (condition == _no_async_condition) { | |
2078 // Conditions have changed since has_special_runtime_exit_condition() | |
2079 // was called: | |
2080 // - if we were here only because of an external suspend request, | |
2081 // then that was taken care of above (or cancelled) so we are done | |
2082 // - if we were here because of another async request, then it has | |
2083 // been cleared between the has_special_runtime_exit_condition() | |
2084 // and now so again we are done | |
2085 return; | |
2086 } | |
2087 | |
2088 // Check for pending async. exception | |
2089 if (_pending_async_exception != NULL) { | |
2090 // Only overwrite an already pending exception, if it is not a threadDeath. | |
1142 | 2091 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 2092 |
2093 // We cannot call Exceptions::_throw(...) here because we cannot block | |
2094 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
2095 | |
2096 if (TraceExceptions) { | |
2097 ResourceMark rm; | |
2098 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
2099 if (has_last_Java_frame() ) { | |
2100 frame f = last_frame(); | |
2101 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
2102 } | |
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|
2103 tty->print_cr(" of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
0 | 2104 } |
2105 _pending_async_exception = NULL; | |
2106 clear_has_async_exception(); | |
2107 } | |
2108 } | |
2109 | |
2110 if (check_unsafe_error && | |
2111 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
2112 condition = _no_async_condition; // done | |
2113 switch (thread_state()) { | |
2114 case _thread_in_vm: | |
2115 { | |
2116 JavaThread* THREAD = this; | |
2117 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
2118 } | |
2119 case _thread_in_native: | |
2120 { | |
2121 ThreadInVMfromNative tiv(this); | |
2122 JavaThread* THREAD = this; | |
2123 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
2124 } | |
2125 case _thread_in_Java: | |
2126 { | |
2127 ThreadInVMfromJava tiv(this); | |
2128 JavaThread* THREAD = this; | |
2129 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
2130 } | |
2131 default: | |
2132 ShouldNotReachHere(); | |
2133 } | |
2134 } | |
2135 | |
2136 assert(condition == _no_async_condition || has_pending_exception() || | |
2137 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
2138 "must have handled the async condition, if no exception"); | |
2139 } | |
2140 | |
2141 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
2142 // | |
2143 // Check for pending external suspend. Internal suspend requests do | |
2144 // not use handle_special_runtime_exit_condition(). | |
2145 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2146 // thread is not the current thread. In older versions of jdbx, jdbx | |
2147 // threads could call into the VM with another thread's JNIEnv so we | |
2148 // can be here operating on behalf of a suspended thread (4432884). | |
2149 bool do_self_suspend = is_external_suspend_with_lock(); | |
2150 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
2151 // | |
2152 // Because thread is external suspended the safepoint code will count | |
2153 // thread as at a safepoint. This can be odd because we can be here | |
2154 // as _thread_in_Java which would normally transition to _thread_blocked | |
2155 // at a safepoint. We would like to mark the thread as _thread_blocked | |
2156 // before calling java_suspend_self like all other callers of it but | |
2157 // we must then observe proper safepoint protocol. (We can't leave | |
2158 // _thread_blocked with a safepoint in progress). However we can be | |
2159 // here as _thread_in_native_trans so we can't use a normal transition | |
2160 // constructor/destructor pair because they assert on that type of | |
2161 // transition. We could do something like: | |
2162 // | |
2163 // JavaThreadState state = thread_state(); | |
2164 // set_thread_state(_thread_in_vm); | |
2165 // { | |
2166 // ThreadBlockInVM tbivm(this); | |
2167 // java_suspend_self() | |
2168 // } | |
2169 // set_thread_state(_thread_in_vm_trans); | |
2170 // if (safepoint) block; | |
2171 // set_thread_state(state); | |
2172 // | |
2173 // but that is pretty messy. Instead we just go with the way the | |
2174 // code has worked before and note that this is the only path to | |
2175 // java_suspend_self that doesn't put the thread in _thread_blocked | |
2176 // mode. | |
2177 | |
2178 frame_anchor()->make_walkable(this); | |
2179 java_suspend_self(); | |
2180 | |
2181 // We might be here for reasons in addition to the self-suspend request | |
2182 // so check for other async requests. | |
2183 } | |
2184 | |
2185 if (check_asyncs) { | |
2186 check_and_handle_async_exceptions(); | |
2187 } | |
2188 } | |
2189 | |
2190 void JavaThread::send_thread_stop(oop java_throwable) { | |
2191 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
2192 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
2193 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
2194 | |
2195 // Do not throw asynchronous exceptions against the compiler thread | |
2196 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
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Thomas Wuerthinger <thomas.wuerthinger@gmail.com>
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1320
diff
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|
2197 |
5056
2f2c6347fce4
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Gilles Duboscq <duboscq@ssw.jku.at>
parents:
4993
diff
changeset
|
2198 // (thomaswue) May we do this? |
1410
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parents:
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diff
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|
2199 //if (is_Compiler_thread()) return; |
0 | 2200 |
2201 { | |
2202 // Actually throw the Throwable against the target Thread - however | |
2203 // only if there is no thread death exception installed already. | |
1142 | 2204 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 2205 // If the topmost frame is a runtime stub, then we are calling into |
2206 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
2207 // must deoptimize the caller before continuing, as the compiled exception handler table | |
2208 // may not be valid | |
2209 if (has_last_Java_frame()) { | |
2210 frame f = last_frame(); | |
2211 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
2212 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2213 RegisterMap reg_map(this, UseBiasedLocking); | |
2214 frame compiled_frame = f.sender(®_map); | |
7428
2d6c433b1f38
8004741: Missing compiled exception handle table entry for multidimensional array allocation
kvn
parents:
7206
diff
changeset
|
2215 if (!StressCompiledExceptionHandlers && compiled_frame.can_be_deoptimized()) { |
7483
729a79037bd5
Fixes after merge with hs25-b15.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
7482
diff
changeset
|
2216 Deoptimization::deoptimize(this, compiled_frame, ®_map, Deoptimization::Reason_constraint); |
0 | 2217 } |
2218 } | |
2219 } | |
2220 | |
2221 // Set async. pending exception in thread. | |
2222 set_pending_async_exception(java_throwable); | |
2223 | |
2224 if (TraceExceptions) { | |
2225 ResourceMark rm; | |
6725
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coleenp
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6198
diff
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|
2226 tty->print_cr("Pending Async. exception installed of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
0 | 2227 } |
2228 // for AbortVMOnException flag | |
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diff
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|
2229 NOT_PRODUCT(Exceptions::debug_check_abort(InstanceKlass::cast(_pending_async_exception->klass())->external_name())); |
0 | 2230 } |
2231 } | |
2232 | |
2233 | |
2234 // Interrupt thread so it will wake up from a potential wait() | |
2235 Thread::interrupt(this); | |
2236 } | |
2237 | |
2238 // External suspension mechanism. | |
2239 // | |
2240 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
2241 // to any VM_locks and it is at a transition | |
2242 // Self-suspension will happen on the transition out of the vm. | |
2243 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
2244 // | |
2245 // Guarantees on return: | |
2246 // + Target thread will not execute any new bytecode (that's why we need to | |
2247 // force a safepoint) | |
2248 // + Target thread will not enter any new monitors | |
2249 // | |
2250 void JavaThread::java_suspend() { | |
2251 { MutexLocker mu(Threads_lock); | |
2252 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
2253 return; | |
2254 } | |
2255 } | |
2256 | |
2257 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2258 if (!is_external_suspend()) { | |
2259 // a racing resume has cancelled us; bail out now | |
2260 return; | |
2261 } | |
2262 | |
2263 // suspend is done | |
2264 uint32_t debug_bits = 0; | |
2265 // Warning: is_ext_suspend_completed() may temporarily drop the | |
2266 // SR_lock to allow the thread to reach a stable thread state if | |
2267 // it is currently in a transient thread state. | |
2268 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
2269 SuspendRetryDelay, &debug_bits) ) { | |
2270 return; | |
2271 } | |
2272 } | |
2273 | |
2274 VM_ForceSafepoint vm_suspend; | |
2275 VMThread::execute(&vm_suspend); | |
2276 } | |
2277 | |
2278 // Part II of external suspension. | |
2279 // A JavaThread self suspends when it detects a pending external suspend | |
2280 // request. This is usually on transitions. It is also done in places | |
2281 // where continuing to the next transition would surprise the caller, | |
2282 // e.g., monitor entry. | |
2283 // | |
2284 // Returns the number of times that the thread self-suspended. | |
2285 // | |
2286 // Note: DO NOT call java_suspend_self() when you just want to block current | |
2287 // thread. java_suspend_self() is the second stage of cooperative | |
2288 // suspension for external suspend requests and should only be used | |
2289 // to complete an external suspend request. | |
2290 // | |
2291 int JavaThread::java_suspend_self() { | |
2292 int ret = 0; | |
2293 | |
2294 // we are in the process of exiting so don't suspend | |
2295 if (is_exiting()) { | |
2296 clear_external_suspend(); | |
2297 return ret; | |
2298 } | |
2299 | |
2300 assert(_anchor.walkable() || | |
2301 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
2302 "must have walkable stack"); | |
2303 | |
2304 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2305 | |
979 | 2306 assert(!this->is_ext_suspended(), |
0 | 2307 "a thread trying to self-suspend should not already be suspended"); |
2308 | |
2309 if (this->is_suspend_equivalent()) { | |
2310 // If we are self-suspending as a result of the lifting of a | |
2311 // suspend equivalent condition, then the suspend_equivalent | |
2312 // flag is not cleared until we set the ext_suspended flag so | |
2313 // that wait_for_ext_suspend_completion() returns consistent | |
2314 // results. | |
2315 this->clear_suspend_equivalent(); | |
2316 } | |
2317 | |
2318 // A racing resume may have cancelled us before we grabbed SR_lock | |
2319 // above. Or another external suspend request could be waiting for us | |
2320 // by the time we return from SR_lock()->wait(). The thread | |
2321 // that requested the suspension may already be trying to walk our | |
2322 // stack and if we return now, we can change the stack out from under | |
2323 // it. This would be a "bad thing (TM)" and cause the stack walker | |
2324 // to crash. We stay self-suspended until there are no more pending | |
2325 // external suspend requests. | |
2326 while (is_external_suspend()) { | |
2327 ret++; | |
2328 this->set_ext_suspended(); | |
2329 | |
2330 // _ext_suspended flag is cleared by java_resume() | |
2331 while (is_ext_suspended()) { | |
2332 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
2333 } | |
2334 } | |
2335 | |
2336 return ret; | |
2337 } | |
2338 | |
2339 #ifdef ASSERT | |
2340 // verify the JavaThread has not yet been published in the Threads::list, and | |
2341 // hence doesn't need protection from concurrent access at this stage | |
2342 void JavaThread::verify_not_published() { | |
2343 if (!Threads_lock->owned_by_self()) { | |
2344 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
2345 assert( !Threads::includes(this), | |
2346 "java thread shouldn't have been published yet!"); | |
2347 } | |
2348 else { | |
2349 assert( !Threads::includes(this), | |
2350 "java thread shouldn't have been published yet!"); | |
2351 } | |
2352 } | |
2353 #endif | |
2354 | |
2355 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2356 // progress or when _suspend_flags is non-zero. | |
2357 // Current thread needs to self-suspend if there is a suspend request and/or | |
2358 // block if a safepoint is in progress. | |
2359 // Async exception ISN'T checked. | |
2360 // Note only the ThreadInVMfromNative transition can call this function | |
2361 // directly and when thread state is _thread_in_native_trans | |
2362 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
2363 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
2364 | |
2365 JavaThread *curJT = JavaThread::current(); | |
2366 bool do_self_suspend = thread->is_external_suspend(); | |
2367 | |
2368 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
2369 | |
2370 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2371 // thread is not the current thread. In older versions of jdbx, jdbx | |
2372 // threads could call into the VM with another thread's JNIEnv so we | |
2373 // can be here operating on behalf of a suspended thread (4432884). | |
2374 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
2375 JavaThreadState state = thread->thread_state(); | |
2376 | |
2377 // We mark this thread_blocked state as a suspend-equivalent so | |
2378 // that a caller to is_ext_suspend_completed() won't be confused. | |
2379 // The suspend-equivalent state is cleared by java_suspend_self(). | |
2380 thread->set_suspend_equivalent(); | |
2381 | |
2382 // If the safepoint code sees the _thread_in_native_trans state, it will | |
2383 // wait until the thread changes to other thread state. There is no | |
2384 // guarantee on how soon we can obtain the SR_lock and complete the | |
2385 // self-suspend request. It would be a bad idea to let safepoint wait for | |
2386 // too long. Temporarily change the state to _thread_blocked to | |
2387 // let the VM thread know that this thread is ready for GC. The problem | |
2388 // of changing thread state is that safepoint could happen just after | |
2389 // java_suspend_self() returns after being resumed, and VM thread will | |
2390 // see the _thread_blocked state. We must check for safepoint | |
2391 // after restoring the state and make sure we won't leave while a safepoint | |
2392 // is in progress. | |
2393 thread->set_thread_state(_thread_blocked); | |
2394 thread->java_suspend_self(); | |
2395 thread->set_thread_state(state); | |
2396 // Make sure new state is seen by VM thread | |
2397 if (os::is_MP()) { | |
2398 if (UseMembar) { | |
2399 // Force a fence between the write above and read below | |
2400 OrderAccess::fence(); | |
2401 } else { | |
2402 // Must use this rather than serialization page in particular on Windows | |
2403 InterfaceSupport::serialize_memory(thread); | |
2404 } | |
2405 } | |
2406 } | |
2407 | |
2408 if (SafepointSynchronize::do_call_back()) { | |
2409 // If we are safepointing, then block the caller which may not be | |
2410 // the same as the target thread (see above). | |
2411 SafepointSynchronize::block(curJT); | |
2412 } | |
2413 | |
2414 if (thread->is_deopt_suspend()) { | |
2415 thread->clear_deopt_suspend(); | |
2416 RegisterMap map(thread, false); | |
2417 frame f = thread->last_frame(); | |
2418 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
2419 f = f.sender(&map); | |
2420 } | |
2421 if (f.id() == thread->must_deopt_id()) { | |
2422 thread->clear_must_deopt_id(); | |
1727
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1689
diff
changeset
|
2423 f.deoptimize(thread); |
0 | 2424 } else { |
2425 fatal("missed deoptimization!"); | |
2426 } | |
2427 } | |
2428 } | |
2429 | |
2430 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2431 // progress or when _suspend_flags is non-zero. | |
2432 // Current thread needs to self-suspend if there is a suspend request and/or | |
2433 // block if a safepoint is in progress. | |
2434 // Also check for pending async exception (not including unsafe access error). | |
2435 // Note only the native==>VM/Java barriers can call this function and when | |
2436 // thread state is _thread_in_native_trans. | |
2437 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
2438 check_safepoint_and_suspend_for_native_trans(thread); | |
2439 | |
2440 if (thread->has_async_exception()) { | |
2441 // We are in _thread_in_native_trans state, don't handle unsafe | |
2442 // access error since that may block. | |
2443 thread->check_and_handle_async_exceptions(false); | |
2444 } | |
2445 } | |
2446 | |
4873
0382d2b469b2
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parents:
4872
diff
changeset
|
2447 // This is a variant of the normal |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
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parents:
4872
diff
changeset
|
2448 // check_special_condition_for_native_trans with slightly different |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2449 // semantics for use by critical native wrappers. It does all the |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2450 // normal checks but also performs the transition back into |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2451 // thread_in_Java state. This is required so that critical natives |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2452 // can potentially block and perform a GC if they are the last thread |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2453 // exiting the GC_locker. |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2454 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) { |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2455 check_special_condition_for_native_trans(thread); |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2456 |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2457 // Finish the transition |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2458 thread->set_thread_state(_thread_in_Java); |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2459 |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2460 if (thread->do_critical_native_unlock()) { |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2461 ThreadInVMfromJavaNoAsyncException tiv(thread); |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2462 GC_locker::unlock_critical(thread); |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2463 thread->clear_critical_native_unlock(); |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2464 } |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2465 } |
0382d2b469b2
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never
parents:
4872
diff
changeset
|
2466 |
0 | 2467 // We need to guarantee the Threads_lock here, since resumes are not |
2468 // allowed during safepoint synchronization | |
2469 // Can only resume from an external suspension | |
2470 void JavaThread::java_resume() { | |
2471 assert_locked_or_safepoint(Threads_lock); | |
2472 | |
2473 // Sanity check: thread is gone, has started exiting or the thread | |
2474 // was not externally suspended. | |
2475 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
2476 return; | |
2477 } | |
2478 | |
2479 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2480 | |
2481 clear_external_suspend(); | |
2482 | |
2483 if (is_ext_suspended()) { | |
2484 clear_ext_suspended(); | |
2485 SR_lock()->notify_all(); | |
2486 } | |
2487 } | |
2488 | |
2489 void JavaThread::create_stack_guard_pages() { | |
2490 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
2491 address low_addr = stack_base() - stack_size(); | |
2492 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2493 | |
2494 int allocate = os::allocate_stack_guard_pages(); | |
2495 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
2496 | |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1290
diff
changeset
|
2497 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
0 | 2498 warning("Attempt to allocate stack guard pages failed."); |
2499 return; | |
2500 } | |
2501 | |
2502 if (os::guard_memory((char *) low_addr, len)) { | |
2503 _stack_guard_state = stack_guard_enabled; | |
2504 } else { | |
2505 warning("Attempt to protect stack guard pages failed."); | |
2506 if (os::uncommit_memory((char *) low_addr, len)) { | |
2507 warning("Attempt to deallocate stack guard pages failed."); | |
2508 } | |
2509 } | |
2510 } | |
2511 | |
2512 void JavaThread::remove_stack_guard_pages() { | |
6882
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6872
diff
changeset
|
2513 assert(Thread::current() == this, "from different thread"); |
0 | 2514 if (_stack_guard_state == stack_guard_unused) return; |
2515 address low_addr = stack_base() - stack_size(); | |
2516 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2517 | |
2518 if (os::allocate_stack_guard_pages()) { | |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1290
diff
changeset
|
2519 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
0 | 2520 _stack_guard_state = stack_guard_unused; |
2521 } else { | |
2522 warning("Attempt to deallocate stack guard pages failed."); | |
2523 } | |
2524 } else { | |
2525 if (_stack_guard_state == stack_guard_unused) return; | |
2526 if (os::unguard_memory((char *) low_addr, len)) { | |
2527 _stack_guard_state = stack_guard_unused; | |
2528 } else { | |
2529 warning("Attempt to unprotect stack guard pages failed."); | |
2530 } | |
2531 } | |
2532 } | |
2533 | |
2534 void JavaThread::enable_stack_yellow_zone() { | |
2535 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2536 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
2537 | |
2538 // The base notation is from the stacks point of view, growing downward. | |
2539 // We need to adjust it to work correctly with guard_memory() | |
2540 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2541 | |
2542 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
2543 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
2544 | |
2545 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
2546 _stack_guard_state = stack_guard_enabled; | |
2547 } else { | |
2548 warning("Attempt to guard stack yellow zone failed."); | |
2549 } | |
2550 enable_register_stack_guard(); | |
2551 } | |
2552 | |
2553 void JavaThread::disable_stack_yellow_zone() { | |
2554 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2555 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
2556 | |
2557 // Simply return if called for a thread that does not use guard pages. | |
2558 if (_stack_guard_state == stack_guard_unused) return; | |
2559 | |
2560 // The base notation is from the stacks point of view, growing downward. | |
2561 // We need to adjust it to work correctly with guard_memory() | |
2562 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2563 | |
2564 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
2565 _stack_guard_state = stack_guard_yellow_disabled; | |
2566 } else { | |
2567 warning("Attempt to unguard stack yellow zone failed."); | |
2568 } | |
2569 disable_register_stack_guard(); | |
2570 } | |
2571 | |
2572 void JavaThread::enable_stack_red_zone() { | |
2573 // The base notation is from the stacks point of view, growing downward. | |
2574 // We need to adjust it to work correctly with guard_memory() | |
2575 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2576 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2577 | |
2578 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
2579 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
2580 | |
2581 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
2582 warning("Attempt to guard stack red zone failed."); | |
2583 } | |
2584 } | |
2585 | |
2586 void JavaThread::disable_stack_red_zone() { | |
2587 // The base notation is from the stacks point of view, growing downward. | |
2588 // We need to adjust it to work correctly with guard_memory() | |
2589 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2590 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2591 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
2592 warning("Attempt to unguard stack red zone failed."); | |
2593 } | |
2594 } | |
2595 | |
2596 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
2597 // ignore is there is no stack | |
2598 if (!has_last_Java_frame()) return; | |
2599 // traverse the stack frames. Starts from top frame. | |
2600 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2601 frame* fr = fst.current(); | |
2602 f(fr, fst.register_map()); | |
2603 } | |
2604 } | |
2605 | |
2606 | |
2607 #ifndef PRODUCT | |
2608 // Deoptimization | |
2609 // Function for testing deoptimization | |
2610 void JavaThread::deoptimize() { | |
2611 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2612 StackFrameStream fst(this, UseBiasedLocking); | |
2613 bool deopt = false; // Dump stack only if a deopt actually happens. | |
2614 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
2615 // Iterate over all frames in the thread and deoptimize | |
2616 for(; !fst.is_done(); fst.next()) { | |
2617 if(fst.current()->can_be_deoptimized()) { | |
2618 | |
2619 if (only_at) { | |
2620 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
2621 // consists of comma or carriage return separated numbers so | |
2622 // search for the current bci in that string. | |
2623 address pc = fst.current()->pc(); | |
2624 nmethod* nm = (nmethod*) fst.current()->cb(); | |
2625 ScopeDesc* sd = nm->scope_desc_at( pc); | |
2626 char buffer[8]; | |
2627 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
2628 size_t len = strlen(buffer); | |
2629 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
2630 while (found != NULL) { | |
2631 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
2632 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
2633 // Check that the bci found is bracketed by terminators. | |
2634 break; | |
2635 } | |
2636 found = strstr(found + 1, buffer); | |
2637 } | |
2638 if (!found) { | |
2639 continue; | |
2640 } | |
2641 } | |
2642 | |
2643 if (DebugDeoptimization && !deopt) { | |
2644 deopt = true; // One-time only print before deopt | |
2645 tty->print_cr("[BEFORE Deoptimization]"); | |
2646 trace_frames(); | |
2647 trace_stack(); | |
2648 } | |
5111
422c979ff392
fixed two cases where DeoptAction was invalid
Christian Haeubl <christian.haeubl@oracle.com>
parents:
5110
diff
changeset
|
2649 Deoptimization::deoptimize(this, *fst.current(), fst.register_map(), Deoptimization::Reason_constraint); |
0 | 2650 } |
2651 } | |
2652 | |
2653 if (DebugDeoptimization && deopt) { | |
2654 tty->print_cr("[AFTER Deoptimization]"); | |
2655 trace_frames(); | |
2656 } | |
2657 } | |
2658 | |
2659 | |
2660 // Make zombies | |
2661 void JavaThread::make_zombies() { | |
2662 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2663 if (fst.current()->can_be_deoptimized()) { | |
2664 // it is a Java nmethod | |
2665 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
2666 nm->make_not_entrant(); | |
2667 } | |
2668 } | |
2669 } | |
2670 #endif // PRODUCT | |
2671 | |
2672 | |
2673 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
2674 if (!has_last_Java_frame()) return; | |
2675 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2676 StackFrameStream fst(this, UseBiasedLocking); | |
2677 for(; !fst.is_done(); fst.next()) { | |
2678 if (fst.current()->should_be_deoptimized()) { | |
6843 | 2679 if (LogCompilation && xtty != NULL) { |
2680 nmethod* nm = fst.current()->cb()->as_nmethod_or_null(); | |
2681 xtty->elem("deoptimized thread='" UINTX_FORMAT "' compile_id='%d'", | |
2682 this->name(), nm != NULL ? nm->compile_id() : -1); | |
2683 } | |
2684 | |
5110
0ebca2e35ca5
more preparations for disabling runtime feedback selectively based on deoptimization history
Christian Haeubl <christian.haeubl@oracle.com>
parents:
5056
diff
changeset
|
2685 Deoptimization::deoptimize(this, *fst.current(), fst.register_map(), Deoptimization::Reason_constraint); |
0 | 2686 } |
2687 } | |
2688 } | |
2689 | |
2690 | |
2691 // GC support | |
2692 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
2693 | |
2694 void JavaThread::gc_epilogue() { | |
2695 frames_do(frame_gc_epilogue); | |
2696 } | |
2697 | |
2698 | |
2699 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
2700 | |
2701 void JavaThread::gc_prologue() { | |
2702 frames_do(frame_gc_prologue); | |
2703 } | |
2704 | |
1119
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2705 // If the caller is a NamedThread, then remember, in the current scope, |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2706 // the given JavaThread in its _processed_thread field. |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2707 class RememberProcessedThread: public StackObj { |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2708 NamedThread* _cur_thr; |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2709 public: |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2710 RememberProcessedThread(JavaThread* jthr) { |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2711 Thread* thread = Thread::current(); |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2712 if (thread->is_Named_thread()) { |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2713 _cur_thr = (NamedThread *)thread; |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2714 _cur_thr->set_processed_thread(jthr); |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2715 } else { |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2716 _cur_thr = NULL; |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2717 } |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2718 } |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2719 |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2720 ~RememberProcessedThread() { |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2721 if (_cur_thr) { |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2722 _cur_thr->set_processed_thread(NULL); |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2723 } |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2724 } |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2725 }; |
0 | 2726 |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
2727 void JavaThread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
1166 | 2728 // Verify that the deferred card marks have been flushed. |
2729 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
1027
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
997
diff
changeset
|
2730 |
0 | 2731 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
2732 // since there may be more than one thread using each ThreadProfiler. | |
2733 | |
2734 // Traverse the GCHandles | |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
2735 Thread::oops_do(f, cld_f, cf); |
0 | 2736 |
2737 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2738 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2739 | |
2740 if (has_last_Java_frame()) { | |
1119
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2741 // Record JavaThread to GC thread |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2742 RememberProcessedThread rpt(this); |
0 | 2743 |
2744 // Traverse the privileged stack | |
2745 if (_privileged_stack_top != NULL) { | |
2746 _privileged_stack_top->oops_do(f); | |
2747 } | |
2748 | |
2749 // traverse the registered growable array | |
2750 if (_array_for_gc != NULL) { | |
2751 for (int index = 0; index < _array_for_gc->length(); index++) { | |
2752 f->do_oop(_array_for_gc->adr_at(index)); | |
2753 } | |
2754 } | |
2755 | |
2756 // Traverse the monitor chunks | |
2757 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
2758 chunk->oops_do(f); | |
2759 } | |
2760 | |
2761 // Traverse the execution stack | |
2762 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
2763 fst.current()->oops_do(f, cld_f, cf, fst.register_map()); |
0 | 2764 } |
2765 } | |
2766 | |
2767 // callee_target is never live across a gc point so NULL it here should | |
2768 // it still contain a methdOop. | |
2769 | |
2770 set_callee_target(NULL); | |
2771 | |
2772 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
2773 // If we have deferred set_locals there might be oops waiting to be | |
2774 // written | |
2775 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
2776 if (list != NULL) { | |
2777 for (int i = 0; i < list->length(); i++) { | |
2778 list->at(i)->oops_do(f); | |
2779 } | |
2780 } | |
2781 | |
2782 // Traverse instance variables at the end since the GC may be moving things | |
2783 // around using this function | |
2784 f->do_oop((oop*) &_threadObj); | |
2785 f->do_oop((oop*) &_vm_result); | |
2786 f->do_oop((oop*) &_exception_oop); | |
2787 f->do_oop((oop*) &_pending_async_exception); | |
2788 | |
2789 if (jvmti_thread_state() != NULL) { | |
2790 jvmti_thread_state()->oops_do(f); | |
2791 } | |
3696
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2792 |
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2793 if (_scanned_nmethod != NULL && cf != NULL) { |
7212
291ffc492eb6
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
Doug Simon <doug.simon@oracle.com>
diff
changeset
|
2794 // Safepoints can occur when the sweeper is scanning an nmethod so |
291ffc492eb6
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
Doug Simon <doug.simon@oracle.com>
diff
changeset
|
2795 // process it here to make sure it isn't unloaded in the middle of |
291ffc492eb6
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
Doug Simon <doug.simon@oracle.com>
diff
changeset
|
2796 // a scan. |
291ffc492eb6
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
Doug Simon <doug.simon@oracle.com>
diff
changeset
|
2797 cf->do_code_blob(_scanned_nmethod); |
291ffc492eb6
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
Doug Simon <doug.simon@oracle.com>
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2798 } |
0 | 2799 } |
2800 | |
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2801 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
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2802 Thread::nmethods_do(cf); // (super method is a no-op) |
0 | 2803 |
2804 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2805 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2806 | |
2807 if (has_last_Java_frame()) { | |
2808 // Traverse the execution stack | |
2809 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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2810 fst.current()->nmethods_do(cf); |
0 | 2811 } |
2812 } | |
2813 } | |
2814 | |
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2815 void JavaThread::metadata_do(void f(Metadata*)) { |
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2816 Thread::metadata_do(f); |
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2817 if (has_last_Java_frame()) { |
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2818 // Traverse the execution stack to call f() on the methods in the stack |
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2819 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { |
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2820 fst.current()->metadata_do(f); |
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2821 } |
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2822 } else if (is_Compiler_thread()) { |
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2823 // need to walk ciMetadata in current compile tasks to keep alive. |
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2824 CompilerThread* ct = (CompilerThread*)this; |
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2825 if (ct->env() != NULL) { |
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2826 ct->env()->metadata_do(f); |
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2827 } |
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2828 } |
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2829 } |
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2830 |
0 | 2831 // Printing |
2832 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
2833 switch (_thread_state) { | |
2834 case _thread_uninitialized: return "_thread_uninitialized"; | |
2835 case _thread_new: return "_thread_new"; | |
2836 case _thread_new_trans: return "_thread_new_trans"; | |
2837 case _thread_in_native: return "_thread_in_native"; | |
2838 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
2839 case _thread_in_vm: return "_thread_in_vm"; | |
2840 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
2841 case _thread_in_Java: return "_thread_in_Java"; | |
2842 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
2843 case _thread_blocked: return "_thread_blocked"; | |
2844 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
2845 default: return "unknown thread state"; | |
2846 } | |
2847 } | |
2848 | |
2849 #ifndef PRODUCT | |
2850 void JavaThread::print_thread_state_on(outputStream *st) const { | |
2851 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
2852 }; | |
2853 void JavaThread::print_thread_state() const { | |
2854 print_thread_state_on(tty); | |
2855 }; | |
2856 #endif // PRODUCT | |
2857 | |
2858 // Called by Threads::print() for VM_PrintThreads operation | |
2859 void JavaThread::print_on(outputStream *st) const { | |
2860 st->print("\"%s\" ", get_thread_name()); | |
2861 oop thread_oop = threadObj(); | |
6766 | 2862 if (thread_oop != NULL) { |
2863 st->print("#" INT64_FORMAT " ", java_lang_Thread::thread_id(thread_oop)); | |
2864 if (java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
2865 st->print("prio=%d ", java_lang_Thread::priority(thread_oop)); | |
2866 } | |
0 | 2867 Thread::print_on(st); |
2868 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
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2869 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
0 | 2870 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
2871 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
2872 } | |
2873 #ifndef PRODUCT | |
2874 print_thread_state_on(st); | |
2875 _safepoint_state->print_on(st); | |
2876 #endif // PRODUCT | |
2877 } | |
2878 | |
2879 // Called by fatal error handler. The difference between this and | |
2880 // JavaThread::print() is that we can't grab lock or allocate memory. | |
2881 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
2882 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
2883 oop thread_obj = threadObj(); | |
2884 if (thread_obj != NULL) { | |
2885 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
2886 } | |
2887 st->print(" ["); | |
2888 st->print("%s", _get_thread_state_name(_thread_state)); | |
2889 if (osthread()) { | |
2890 st->print(", id=%d", osthread()->thread_id()); | |
2891 } | |
2892 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
2893 _stack_base - _stack_size, _stack_base); | |
2894 st->print("]"); | |
2895 return; | |
2896 } | |
2897 | |
2898 // Verification | |
2899 | |
2900 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
2901 | |
2902 void JavaThread::verify() { | |
2903 // Verify oops in the thread. | |
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2904 oops_do(&VerifyOopClosure::verify_oop, NULL, NULL); |
0 | 2905 |
2906 // Verify the stack frames. | |
2907 frames_do(frame_verify); | |
2908 } | |
2909 | |
2910 // CR 6300358 (sub-CR 2137150) | |
2911 // Most callers of this method assume that it can't return NULL but a | |
2912 // thread may not have a name whilst it is in the process of attaching to | |
2913 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
2914 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
2915 // if vm exit occurs during initialization). These cases can all be accounted | |
2916 // for such that this method never returns NULL. | |
2917 const char* JavaThread::get_thread_name() const { | |
2918 #ifdef ASSERT | |
2919 // early safepoints can hit while current thread does not yet have TLS | |
2920 if (!SafepointSynchronize::is_at_safepoint()) { | |
2921 Thread *cur = Thread::current(); | |
2922 if (!(cur->is_Java_thread() && cur == this)) { | |
2923 // Current JavaThreads are allowed to get their own name without | |
2924 // the Threads_lock. | |
2925 assert_locked_or_safepoint(Threads_lock); | |
2926 } | |
2927 } | |
2928 #endif // ASSERT | |
2929 return get_thread_name_string(); | |
2930 } | |
2931 | |
2932 // Returns a non-NULL representation of this thread's name, or a suitable | |
2933 // descriptive string if there is no set name | |
2934 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
2935 const char* name_str; | |
2936 oop thread_obj = threadObj(); | |
2937 if (thread_obj != NULL) { | |
2938 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
2939 if (name != NULL) { | |
2940 if (buf == NULL) { | |
2941 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2942 } | |
2943 else { | |
2944 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
2945 } | |
2946 } | |
4006 | 2947 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 |
0 | 2948 name_str = "<no-name - thread is attaching>"; |
2949 } | |
2950 else { | |
2951 name_str = Thread::name(); | |
2952 } | |
2953 } | |
2954 else { | |
2955 name_str = Thread::name(); | |
2956 } | |
2957 assert(name_str != NULL, "unexpected NULL thread name"); | |
2958 return name_str; | |
2959 } | |
2960 | |
2961 | |
2962 const char* JavaThread::get_threadgroup_name() const { | |
2963 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2964 oop thread_obj = threadObj(); | |
2965 if (thread_obj != NULL) { | |
2966 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2967 if (thread_group != NULL) { | |
2968 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
2969 // ThreadGroup.name can be null | |
2970 if (name != NULL) { | |
2971 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2972 return str; | |
2973 } | |
2974 } | |
2975 } | |
2976 return NULL; | |
2977 } | |
2978 | |
2979 const char* JavaThread::get_parent_name() const { | |
2980 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2981 oop thread_obj = threadObj(); | |
2982 if (thread_obj != NULL) { | |
2983 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2984 if (thread_group != NULL) { | |
2985 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
2986 if (parent != NULL) { | |
2987 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
2988 // ThreadGroup.name can be null | |
2989 if (name != NULL) { | |
2990 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2991 return str; | |
2992 } | |
2993 } | |
2994 } | |
2995 } | |
2996 return NULL; | |
2997 } | |
2998 | |
2999 ThreadPriority JavaThread::java_priority() const { | |
3000 oop thr_oop = threadObj(); | |
3001 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
3002 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
3003 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
3004 return priority; | |
3005 } | |
3006 | |
3007 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
3008 | |
3009 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
3010 // Link Java Thread object <-> C++ Thread | |
3011 | |
3012 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
3013 // and put it into a new Handle. The Handle "thread_oop" can then | |
3014 // be used to pass the C++ thread object to other methods. | |
3015 | |
3016 // Set the Java level thread object (jthread) field of the | |
3017 // new thread (a JavaThread *) to C++ thread object using the | |
3018 // "thread_oop" handle. | |
3019 | |
3020 // Set the thread field (a JavaThread *) of the | |
3021 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
3022 | |
3023 Handle thread_oop(Thread::current(), | |
3024 JNIHandles::resolve_non_null(jni_thread)); | |
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3025 assert(InstanceKlass::cast(thread_oop->klass())->is_linked(), |
0 | 3026 "must be initialized"); |
3027 set_threadObj(thread_oop()); | |
3028 java_lang_Thread::set_thread(thread_oop(), this); | |
3029 | |
3030 if (prio == NoPriority) { | |
3031 prio = java_lang_Thread::priority(thread_oop()); | |
3032 assert(prio != NoPriority, "A valid priority should be present"); | |
3033 } | |
3034 | |
3035 // Push the Java priority down to the native thread; needs Threads_lock | |
3036 Thread::set_priority(this, prio); | |
3037 | |
3038 // Add the new thread to the Threads list and set it in motion. | |
3039 // We must have threads lock in order to call Threads::add. | |
3040 // It is crucial that we do not block before the thread is | |
3041 // added to the Threads list for if a GC happens, then the java_thread oop | |
3042 // will not be visited by GC. | |
3043 Threads::add(this); | |
3044 } | |
3045 | |
3046 oop JavaThread::current_park_blocker() { | |
3047 // Support for JSR-166 locks | |
3048 oop thread_oop = threadObj(); | |
242 | 3049 if (thread_oop != NULL && |
3050 JDK_Version::current().supports_thread_park_blocker()) { | |
0 | 3051 return java_lang_Thread::park_blocker(thread_oop); |
3052 } | |
3053 return NULL; | |
3054 } | |
3055 | |
3056 | |
3057 void JavaThread::print_stack_on(outputStream* st) { | |
3058 if (!has_last_Java_frame()) return; | |
3059 ResourceMark rm; | |
3060 HandleMark hm; | |
3061 | |
3062 RegisterMap reg_map(this); | |
3063 vframe* start_vf = last_java_vframe(®_map); | |
3064 int count = 0; | |
3065 for (vframe* f = start_vf; f; f = f->sender() ) { | |
3066 if (f->is_java_frame()) { | |
3067 javaVFrame* jvf = javaVFrame::cast(f); | |
3068 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
3069 | |
3070 // Print out lock information | |
3071 if (JavaMonitorsInStackTrace) { | |
3072 jvf->print_lock_info_on(st, count); | |
3073 } | |
3074 } else { | |
3075 // Ignore non-Java frames | |
3076 } | |
3077 | |
3078 // Bail-out case for too deep stacks | |
3079 count++; | |
3080 if (MaxJavaStackTraceDepth == count) return; | |
3081 } | |
3082 } | |
3083 | |
3084 | |
3085 // JVMTI PopFrame support | |
3086 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
3087 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
3088 if (in_bytes(size_in_bytes) != 0) { | |
6197 | 3089 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes), mtThread); |
0 | 3090 _popframe_preserved_args_size = in_bytes(size_in_bytes); |
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3091 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
0 | 3092 } |
3093 } | |
3094 | |
3095 void* JavaThread::popframe_preserved_args() { | |
3096 return _popframe_preserved_args; | |
3097 } | |
3098 | |
3099 ByteSize JavaThread::popframe_preserved_args_size() { | |
3100 return in_ByteSize(_popframe_preserved_args_size); | |
3101 } | |
3102 | |
3103 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
3104 int sz = in_bytes(popframe_preserved_args_size()); | |
3105 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
3106 return in_WordSize(sz / wordSize); | |
3107 } | |
3108 | |
3109 void JavaThread::popframe_free_preserved_args() { | |
3110 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
6197 | 3111 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args, mtThread); |
0 | 3112 _popframe_preserved_args = NULL; |
3113 _popframe_preserved_args_size = 0; | |
3114 } | |
3115 | |
3116 #ifndef PRODUCT | |
3117 | |
3118 void JavaThread::trace_frames() { | |
3119 tty->print_cr("[Describe stack]"); | |
3120 int frame_no = 1; | |
3121 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
3122 tty->print(" %d. ", frame_no++); | |
3123 fst.current()->print_value_on(tty,this); | |
3124 tty->cr(); | |
3125 } | |
3126 } | |
3127 | |
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3128 class PrintAndVerifyOopClosure: public OopClosure { |
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3129 protected: |
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3130 template <class T> inline void do_oop_work(T* p) { |
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3131 oop obj = oopDesc::load_decode_heap_oop(p); |
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3132 if (obj == NULL) return; |
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3133 tty->print(INTPTR_FORMAT ": ", p); |
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3134 if (obj->is_oop_or_null()) { |
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3135 if (obj->is_objArray()) { |
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3136 tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj); |
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3137 } else { |
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3138 obj->print(); |
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3139 } |
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3140 } else { |
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3141 tty->print_cr("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj); |
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3142 } |
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3143 tty->cr(); |
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3144 } |
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3145 public: |
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3146 virtual void do_oop(oop* p) { do_oop_work(p); } |
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3147 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3148 }; |
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3149 |
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3150 |
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3151 static void oops_print(frame* f, const RegisterMap *map) { |
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never
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diff
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|
3152 PrintAndVerifyOopClosure print; |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3153 f->print_value(); |
7179
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8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
3154 f->oops_do(&print, NULL, NULL, (RegisterMap*)map); |
3908
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3155 } |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3156 |
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never
parents:
3899
diff
changeset
|
3157 // Print our all the locations that contain oops and whether they are |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3158 // valid or not. This useful when trying to find the oldest frame |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3159 // where an oop has gone bad since the frame walk is from youngest to |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3160 // oldest. |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3161 void JavaThread::trace_oops() { |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3162 tty->print_cr("[Trace oops]"); |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3163 frames_do(oops_print); |
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never
parents:
3899
diff
changeset
|
3164 } |
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never
parents:
3899
diff
changeset
|
3165 |
0 | 3166 |
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
3167 #ifdef ASSERT |
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3168 // Print or validate the layout of stack frames |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3169 void JavaThread::print_frame_layout(int depth, bool validate_only) { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3170 ResourceMark rm; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3171 PRESERVE_EXCEPTION_MARK; |
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3172 FrameValues values; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3173 int frame_no = 0; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
2416
diff
changeset
|
3174 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
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|
3175 fst.current()->describe(values, ++frame_no); |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3176 if (depth == frame_no) break; |
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3177 } |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3178 if (validate_only) { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3179 values.validate(); |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3180 } else { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3181 tty->print_cr("[Describe stack layout]"); |
4042
b20d64f83668
7090904: JSR 292: JRuby junit test crashes in PSScavengeRootsClosure::do_oop
twisti
parents:
4007
diff
changeset
|
3182 values.print(this); |
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3183 } |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3184 } |
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
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parents:
3384
diff
changeset
|
3185 #endif |
3336
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diff
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|
3186 |
0 | 3187 void JavaThread::trace_stack_from(vframe* start_vf) { |
3188 ResourceMark rm; | |
3189 int vframe_no = 1; | |
3190 for (vframe* f = start_vf; f; f = f->sender() ) { | |
3191 if (f->is_java_frame()) { | |
3192 javaVFrame::cast(f)->print_activation(vframe_no++); | |
3193 } else { | |
3194 f->print(); | |
3195 } | |
3196 if (vframe_no > StackPrintLimit) { | |
3197 tty->print_cr("...<more frames>..."); | |
3198 return; | |
3199 } | |
3200 } | |
3201 } | |
3202 | |
3203 | |
3204 void JavaThread::trace_stack() { | |
3205 if (!has_last_Java_frame()) return; | |
3206 ResourceMark rm; | |
3207 HandleMark hm; | |
3208 RegisterMap reg_map(this); | |
3209 trace_stack_from(last_java_vframe(®_map)); | |
3210 } | |
3211 | |
3212 | |
3213 #endif // PRODUCT | |
3214 | |
3215 | |
3216 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
3217 assert(reg_map != NULL, "a map must be given"); | |
3218 frame f = last_frame(); | |
3219 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
3220 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
3221 } | |
3222 return NULL; | |
3223 } | |
3224 | |
3225 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3226 Klass* JavaThread::security_get_caller_class(int depth) { |
0 | 3227 vframeStream vfst(this); |
3228 vfst.security_get_caller_frame(depth); | |
3229 if (!vfst.at_end()) { | |
3230 return vfst.method()->method_holder(); | |
3231 } | |
3232 return NULL; | |
3233 } | |
3234 | |
3235 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
3236 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
3237 CompileBroker::compiler_thread_loop(); | |
3238 } | |
3239 | |
3240 // Create a CompilerThread | |
3241 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
3242 : JavaThread(&compiler_thread_entry) { | |
3243 _log = NULL; | |
3244 _task = NULL; | |
3245 _queue = queue; | |
3246 _counters = counters; | |
3247 | |
3248 #ifndef PRODUCT | |
3249 _ideal_graph_printer = NULL; | |
3250 #endif | |
3251 } | |
3252 | |
3253 // ======= Threads ======== | |
3254 | |
3255 // The Threads class links together all active threads, and provides | |
3256 // operations over all threads. It is protected by its own Mutex | |
3257 // lock, which is also used in other contexts to protect thread | |
3258 // operations from having the thread being operated on from exiting | |
3259 // and going away unexpectedly (e.g., safepoint synchronization) | |
3260 | |
3261 JavaThread* Threads::_thread_list = NULL; | |
3262 int Threads::_number_of_threads = 0; | |
3263 int Threads::_number_of_non_daemon_threads = 0; | |
3264 int Threads::_return_code = 0; | |
3265 size_t JavaThread::_stack_size_at_create = 0; | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
3266 #ifdef ASSERT |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3267 bool Threads::_vm_complete = false; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
3268 #endif |
0 | 3269 |
3270 // All JavaThreads | |
3271 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
3272 | |
3273 void os_stream(); | |
3274 | |
3275 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
3276 void Threads::threads_do(ThreadClosure* tc) { | |
3277 assert_locked_or_safepoint(Threads_lock); | |
3278 // ALL_JAVA_THREADS iterates through all JavaThreads | |
3279 ALL_JAVA_THREADS(p) { | |
3280 tc->do_thread(p); | |
3281 } | |
3282 // Someday we could have a table or list of all non-JavaThreads. | |
3283 // For now, just manually iterate through them. | |
3284 tc->do_thread(VMThread::vm_thread()); | |
3285 Universe::heap()->gc_threads_do(tc); | |
323
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3286 WatcherThread *wt = WatcherThread::watcher_thread(); |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3287 // Strictly speaking, the following NULL check isn't sufficient to make sure |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3288 // the data for WatcherThread is still valid upon being examined. However, |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3289 // considering that WatchThread terminates when the VM is on the way to |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3290 // exit at safepoint, the chance of the above is extremely small. The right |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3291 // way to prevent termination of WatcherThread would be to acquire |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3292 // Terminator_lock, but we can't do that without violating the lock rank |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3293 // checking in some cases. |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3294 if (wt != NULL) |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3295 tc->do_thread(wt); |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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286
diff
changeset
|
3296 |
0 | 3297 // If CompilerThreads ever become non-JavaThreads, add them here |
3298 } | |
3299 | |
3300 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
3301 | |
242 | 3302 extern void JDK_Version_init(); |
3303 | |
0 | 3304 // Check version |
3305 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
3306 | |
3307 // Initialize the output stream module | |
3308 ostream_init(); | |
3309 | |
3310 // Process java launcher properties. | |
3311 Arguments::process_sun_java_launcher_properties(args); | |
3312 | |
3313 // Initialize the os module before using TLS | |
3314 os::init(); | |
3315 | |
3316 // Initialize system properties. | |
3317 Arguments::init_system_properties(); | |
3318 | |
242 | 3319 // So that JDK version can be used as a discrimintor when parsing arguments |
3320 JDK_Version_init(); | |
3321 | |
1864
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3322 // Update/Initialize System properties after JDK version number is known |
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3323 Arguments::init_version_specific_system_properties(); |
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3324 |
0 | 3325 // Parse arguments |
3326 jint parse_result = Arguments::parse(args); | |
3327 if (parse_result != JNI_OK) return parse_result; | |
3328 | |
3329 if (PauseAtStartup) { | |
3330 os::pause(); | |
3331 } | |
3332 | |
4006 | 3333 #ifndef USDT2 |
0 | 3334 HS_DTRACE_PROBE(hotspot, vm__init__begin); |
4006 | 3335 #else /* USDT2 */ |
3336 HOTSPOT_VM_INIT_BEGIN(); | |
3337 #endif /* USDT2 */ | |
0 | 3338 |
3339 // Record VM creation timing statistics | |
3340 TraceVmCreationTime create_vm_timer; | |
3341 create_vm_timer.start(); | |
3342 | |
3343 // Timing (must come after argument parsing) | |
3344 TraceTime timer("Create VM", TraceStartupTime); | |
3345 | |
3346 // Initialize the os module after parsing the args | |
3347 jint os_init_2_result = os::init_2(); | |
3348 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
3349 | |
7177
53715fb1597d
7198334: UseNUMA modifies system parameters on non-NUMA system
brutisso
parents:
6985
diff
changeset
|
3350 jint adjust_after_os_result = Arguments::adjust_after_os(); |
53715fb1597d
7198334: UseNUMA modifies system parameters on non-NUMA system
brutisso
parents:
6985
diff
changeset
|
3351 if (adjust_after_os_result != JNI_OK) return adjust_after_os_result; |
53715fb1597d
7198334: UseNUMA modifies system parameters on non-NUMA system
brutisso
parents:
6985
diff
changeset
|
3352 |
6197 | 3353 // intialize TLS |
3354 ThreadLocalStorage::init(); | |
3355 | |
3356 // Bootstrap native memory tracking, so it can start recording memory | |
3357 // activities before worker thread is started. This is the first phase | |
3358 // of bootstrapping, VM is currently running in single-thread mode. | |
3359 MemTracker::bootstrap_single_thread(); | |
3360 | |
0 | 3361 // Initialize output stream logging |
3362 ostream_init_log(); | |
3363 | |
3364 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
3365 // Must be before create_vm_init_agents() | |
3366 if (Arguments::init_libraries_at_startup()) { | |
3367 convert_vm_init_libraries_to_agents(); | |
3368 } | |
3369 | |
3370 // Launch -agentlib/-agentpath and converted -Xrun agents | |
3371 if (Arguments::init_agents_at_startup()) { | |
3372 create_vm_init_agents(); | |
3373 } | |
3374 | |
3375 // Initialize Threads state | |
3376 _thread_list = NULL; | |
3377 _number_of_threads = 0; | |
3378 _number_of_non_daemon_threads = 0; | |
3379 | |
3380 // Initialize global data structures and create system classes in heap | |
3381 vm_init_globals(); | |
3382 | |
3383 // Attach the main thread to this os thread | |
3384 JavaThread* main_thread = new JavaThread(); | |
3385 main_thread->set_thread_state(_thread_in_vm); | |
3386 // must do this before set_active_handles and initialize_thread_local_storage | |
3387 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
3388 // change the stack size recorded here to one based on the java thread | |
3389 // stacksize. This adjusted size is what is used to figure the placement | |
3390 // of the guard pages. | |
3391 main_thread->record_stack_base_and_size(); | |
3392 main_thread->initialize_thread_local_storage(); | |
3393 | |
3394 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
3395 | |
3396 if (!main_thread->set_as_starting_thread()) { | |
3397 vm_shutdown_during_initialization( | |
3398 "Failed necessary internal allocation. Out of swap space"); | |
3399 delete main_thread; | |
3400 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3401 return JNI_ENOMEM; | |
3402 } | |
3403 | |
3404 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
3405 // crash Linux VM, see notes in os_linux.cpp. | |
3406 main_thread->create_stack_guard_pages(); | |
3407 | |
1878 | 3408 // Initialize Java-Level synchronization subsystem |
3409 ObjectMonitor::Initialize() ; | |
0 | 3410 |
6197 | 3411 // Second phase of bootstrapping, VM is about entering multi-thread mode |
3412 MemTracker::bootstrap_multi_thread(); | |
3413 | |
0 | 3414 // Initialize global modules |
3415 jint status = init_globals(); | |
3416 if (status != JNI_OK) { | |
3417 delete main_thread; | |
3418 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3419 return status; | |
3420 } | |
3421 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3422 // Should be done after the heap is fully created |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3423 main_thread->cache_global_variables(); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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1608
diff
changeset
|
3424 |
0 | 3425 HandleMark hm; |
3426 | |
3427 { MutexLocker mu(Threads_lock); | |
3428 Threads::add(main_thread); | |
3429 } | |
3430 | |
3431 // Any JVMTI raw monitors entered in onload will transition into | |
3432 // real raw monitor. VM is setup enough here for raw monitor enter. | |
3433 JvmtiExport::transition_pending_onload_raw_monitors(); | |
3434 | |
3435 if (VerifyBeforeGC && | |
3436 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
3437 Universe::heap()->prepare_for_verify(); | |
3438 Universe::verify(); // make sure we're starting with a clean slate | |
3439 } | |
3440 | |
6197 | 3441 // Fully start NMT |
3442 MemTracker::start(); | |
3443 | |
0 | 3444 // Create the VMThread |
3445 { TraceTime timer("Start VMThread", TraceStartupTime); | |
3446 VMThread::create(); | |
3447 Thread* vmthread = VMThread::vm_thread(); | |
3448 | |
3449 if (!os::create_thread(vmthread, os::vm_thread)) | |
3450 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
3451 | |
3452 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
3453 // Monitors can have spurious returns, must always check another state flag | |
3454 { | |
3455 MutexLocker ml(Notify_lock); | |
3456 os::start_thread(vmthread); | |
3457 while (vmthread->active_handles() == NULL) { | |
3458 Notify_lock->wait(); | |
3459 } | |
3460 } | |
3461 } | |
3462 | |
3463 assert (Universe::is_fully_initialized(), "not initialized"); | |
3464 EXCEPTION_MARK; | |
3465 | |
3466 // At this point, the Universe is initialized, but we have not executed | |
3467 // any byte code. Now is a good time (the only time) to dump out the | |
3468 // internal state of the JVM for sharing. | |
3469 if (DumpSharedSpaces) { | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3470 MetaspaceShared::preload_and_dump(CHECK_0); |
0 | 3471 ShouldNotReachHere(); |
3472 } | |
3473 | |
3474 // Always call even when there are not JVMTI environments yet, since environments | |
3475 // may be attached late and JVMTI must track phases of VM execution | |
3476 JvmtiExport::enter_start_phase(); | |
3477 | |
3478 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
3479 JvmtiExport::post_vm_start(); | |
3480 | |
3481 { | |
3482 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
3483 | |
3484 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3485 create_vm_init_libraries(); | |
3486 } | |
3487 | |
7608 | 3488 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
0 | 3489 |
18
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3490 if (AggressiveOpts) { |
192
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
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62
diff
changeset
|
3491 { |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
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62
diff
changeset
|
3492 // Forcibly initialize java/util/HashMap and mutate the private |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3493 // static final "frontCacheEnabled" field before we start creating instances |
18
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3494 #ifdef ASSERT |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3495 Klass* tmp_k = SystemDictionary::find(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
192
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3496 assert(tmp_k == NULL, "java/util/HashMap should not be loaded yet"); |
18
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3497 #endif |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3498 Klass* k_o = SystemDictionary::resolve_or_null(vmSymbols::java_util_HashMap(), Handle(), Handle(), CHECK_0); |
192
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3499 KlassHandle k = KlassHandle(THREAD, k_o); |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3500 guarantee(k.not_null(), "Must find java/util/HashMap"); |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3501 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3502 ik->initialize(CHECK_0); |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3503 fieldDescriptor fd; |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3504 // Possible we might not find this field; if so, don't break |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3505 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
never
parents:
2302
diff
changeset
|
3506 k()->java_mirror()->bool_field_put(fd.offset(), true); |
192
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3507 } |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3508 } |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3509 |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3510 if (UseStringCache) { |
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3511 // Forcibly initialize java/lang/StringValue and mutate the private |
192
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3512 // static final "stringCacheEnabled" field before we start creating instances |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3513 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
|
3514 // 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
|
3515 if (k_o != NULL) { |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3516 KlassHandle k = KlassHandle(THREAD, k_o); |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3517 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3518 ik->initialize(CHECK_0); |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3519 fieldDescriptor fd; |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3520 // 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
|
3521 if (ik->find_local_field(vmSymbols::stringCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
2376
c7f3d0b4570f
7017732: move static fields into Class to prepare for perm gen removal
never
parents:
2302
diff
changeset
|
3522 k()->java_mirror()->bool_field_put(fd.offset(), true); |
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3523 } |
192
6d13fcb3663f
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kvn
parents:
62
diff
changeset
|
3524 } |
18
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3525 } |
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3526 } |
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3527 |
0 | 3528 // Initialize java_lang.System (needed before creating the thread) |
7608 | 3529 initialize_class(vmSymbols::java_lang_System(), CHECK_0); |
3530 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); | |
3531 Handle thread_group = create_initial_thread_group(CHECK_0); | |
3532 Universe::set_main_thread_group(thread_group()); | |
3533 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); | |
3534 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); | |
3535 main_thread->set_threadObj(thread_object); | |
3536 // Set thread status to running since main thread has | |
3537 // been started and running. | |
3538 java_lang_Thread::set_thread_status(thread_object, | |
3539 java_lang_Thread::RUNNABLE); | |
3540 | |
3541 // The VM creates & returns objects of this class. Make sure it's initialized. | |
3542 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); | |
3543 | |
3544 // The VM preresolves methods to these classes. Make sure that they get initialized | |
3545 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0); | |
3546 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); | |
3547 call_initializeSystemClass(CHECK_0); | |
3548 | |
3549 // get the Java runtime name after java.lang.System is initialized | |
3550 JDK_Version::set_runtime_name(get_java_runtime_name(THREAD)); | |
3551 JDK_Version::set_runtime_version(get_java_runtime_version(THREAD)); | |
0 | 3552 |
3553 // an instance of OutOfMemory exception has been allocated earlier | |
7608 | 3554 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
3555 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); | |
3556 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); | |
3557 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); | |
3558 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); | |
3559 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); | |
3560 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); | |
3561 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK_0); | |
2416
38fea01eb669
6817525: turn on method handle functionality by default for JSR 292
twisti
parents:
2376
diff
changeset
|
3562 } |
0 | 3563 |
3564 // See : bugid 4211085. | |
3565 // Background : the static initializer of java.lang.Compiler tries to read | |
3566 // property"java.compiler" and read & write property "java.vm.info". | |
3567 // When a security manager is installed through the command line | |
3568 // option "-Djava.security.manager", the above properties are not | |
3569 // readable and the static initializer for java.lang.Compiler fails | |
3570 // resulting in a NoClassDefFoundError. This can happen in any | |
3571 // user code which calls methods in java.lang.Compiler. | |
3572 // Hack : the hack is to pre-load and initialize this class, so that only | |
3573 // system domains are on the stack when the properties are read. | |
3574 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
3575 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
3576 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
3577 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
3578 // 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
|
3579 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
0 | 3580 |
3581 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
3582 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
3583 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
3584 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
3585 // This should also be taken out as soon as 4211383 gets fixed. | |
3586 reset_vm_info_property(CHECK_0); | |
3587 | |
3588 quicken_jni_functions(); | |
3589 | |
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3590 // Must be run after init_ft which initializes ft_enabled |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3591 if (TRACE_INITIALIZE() != JNI_OK) { |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3592 vm_exit_during_initialization("Failed to initialize tracing backend"); |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3593 } |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3594 |
0 | 3595 // Set flag that basic initialization has completed. Used by exceptions and various |
3596 // debug stuff, that does not work until all basic classes have been initialized. | |
3597 set_init_completed(); | |
3598 | |
4006 | 3599 #ifndef USDT2 |
0 | 3600 HS_DTRACE_PROBE(hotspot, vm__init__end); |
4006 | 3601 #else /* USDT2 */ |
3602 HOTSPOT_VM_INIT_END(); | |
3603 #endif /* USDT2 */ | |
0 | 3604 |
3605 // record VM initialization completion time | |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3606 #if INCLUDE_MANAGEMENT |
0 | 3607 Management::record_vm_init_completed(); |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3608 #endif // INCLUDE_MANAGEMENT |
0 | 3609 |
3610 // Compute system loader. Note that this has to occur after set_init_completed, since | |
3611 // valid exceptions may be thrown in the process. | |
3612 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
3613 // set_init_completed has just been called, causing exceptions not to be shortcut | |
3614 // anymore. We call vm_exit_during_initialization directly instead. | |
3615 SystemDictionary::compute_java_system_loader(THREAD); | |
3616 if (HAS_PENDING_EXCEPTION) { | |
3617 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3618 } | |
3619 | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
3620 #if INCLUDE_ALL_GCS |
0 | 3621 // Support for ConcurrentMarkSweep. This should be cleaned up |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3622 // 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
|
3623 // once things are properly refactored. XXX YSR |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3624 if (UseConcMarkSweepGC || UseG1GC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3625 if (UseConcMarkSweepGC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3626 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3627 } else { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3628 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3629 } |
0 | 3630 if (HAS_PENDING_EXCEPTION) { |
3631 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3632 } | |
3633 } | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
3634 #endif // INCLUDE_ALL_GCS |
0 | 3635 |
3636 // Always call even when there are not JVMTI environments yet, since environments | |
3637 // may be attached late and JVMTI must track phases of VM execution | |
3638 JvmtiExport::enter_live_phase(); | |
3639 | |
3640 // Signal Dispatcher needs to be started before VMInit event is posted | |
3641 os::signal_init(); | |
3642 | |
3643 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
3644 if (!DisableAttachMechanism) { | |
3645 if (StartAttachListener || AttachListener::init_at_startup()) { | |
3646 AttachListener::init(); | |
3647 } | |
3648 } | |
3649 | |
3650 // Launch -Xrun agents | |
3651 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
3652 // back-end can launch with -Xdebug -Xrunjdwp. | |
3653 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3654 create_vm_init_libraries(); | |
3655 } | |
3656 | |
6002
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3657 // 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
|
3658 JvmtiExport::post_vm_initialized(); |
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3659 |
4800
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3660 if (!TRACE_START()) { |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3661 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3662 } |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3663 |
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3664 if (CleanChunkPoolAsync) { |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3665 Chunk::start_chunk_pool_cleaner_task(); |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3666 } |
0 | 3667 |
3668 // initialize compiler(s) | |
7212
291ffc492eb6
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
Doug Simon <doug.simon@oracle.com>
diff
changeset
|
3669 #if defined(COMPILER1) || defined(COMPILER2) || defined(SHARK) || defined(GRAALVM) |
0 | 3670 CompileBroker::compilation_init(); |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3671 #endif |
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3672 |
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3673 #if INCLUDE_MANAGEMENT |
0 | 3674 Management::initialize(THREAD); |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3675 #endif // INCLUDE_MANAGEMENT |
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3676 |
0 | 3677 if (HAS_PENDING_EXCEPTION) { |
3678 // management agent fails to start possibly due to | |
3679 // configuration problem and is responsible for printing | |
3680 // stack trace if appropriate. Simply exit VM. | |
3681 vm_exit(1); | |
3682 } | |
3683 | |
3684 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
3685 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
3686 if (MemProfiling) MemProfiler::engage(); | |
3687 StatSampler::engage(); | |
3688 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
3689 | |
3690 BiasedLocking::init(); | |
3691 | |
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3692 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
|
3693 call_postVMInitHook(THREAD); |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3694 // 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
|
3695 // exceptions and provide means of diagnosis. |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3696 if (HAS_PENDING_EXCEPTION) { |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3697 CLEAR_PENDING_EXCEPTION; |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3698 } |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3699 } |
0 | 3700 |
6939
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3701 { |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3702 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3703 // Make sure the watcher thread can be started by WatcherThread::start() |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3704 // or by dynamic enrollment. |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3705 WatcherThread::make_startable(); |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3706 // Start up the WatcherThread if there are any periodic tasks |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3707 // NOTE: All PeriodicTasks should be registered by now. If they |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3708 // aren't, late joiners might appear to start slowly (we might |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3709 // take a while to process their first tick). |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3710 if (PeriodicTask::num_tasks() > 0) { |
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3711 WatcherThread::start(); |
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3712 } |
0 | 3713 } |
3714 | |
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3715 // Give os specific code one last chance to start |
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3716 os::init_3(); |
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3717 |
0 | 3718 create_vm_timer.end(); |
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3719 #ifdef ASSERT |
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3720 _vm_complete = true; |
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3721 #endif |
0 | 3722 return JNI_OK; |
3723 } | |
3724 | |
3725 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
3726 extern "C" { | |
3727 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
3728 } | |
3729 // Find a command line agent library and return its entry point for | |
3730 // -agentlib: -agentpath: -Xrun | |
3731 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
3732 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
3733 OnLoadEntry_t on_load_entry = NULL; | |
3734 void *library = agent->os_lib(); // check if we have looked it up before | |
3735 | |
3736 if (library == NULL) { | |
3737 char buffer[JVM_MAXPATHLEN]; | |
3738 char ebuf[1024]; | |
3739 const char *name = agent->name(); | |
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3740 const char *msg = "Could not find agent library "; |
0 | 3741 |
3742 if (agent->is_absolute_path()) { | |
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3743 library = os::dll_load(name, ebuf, sizeof ebuf); |
0 | 3744 if (library == NULL) { |
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3745 const char *sub_msg = " in absolute path, with error: "; |
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3746 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
6197 | 3747 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
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3748 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3749 // If we can't find the agent, exit. |
1694
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3750 vm_exit_during_initialization(buf, NULL); |
6197 | 3751 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
0 | 3752 } |
3753 } else { | |
3754 // Try to load the agent from the standard dll directory | |
6966
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3755 if (os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), |
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3756 name)) { |
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3757 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
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3758 } |
0 | 3759 if (library == NULL) { // Try the local directory |
3760 char ns[1] = {0}; | |
6966
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3761 if (os::dll_build_name(buffer, sizeof(buffer), ns, name)) { |
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3762 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
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3763 } |
0 | 3764 if (library == NULL) { |
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3765 const char *sub_msg = " on the library path, with error: "; |
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3766 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
6197 | 3767 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
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3768 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3769 // If we can't find the agent, exit. |
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3770 vm_exit_during_initialization(buf, NULL); |
6197 | 3771 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
0 | 3772 } |
3773 } | |
3774 } | |
3775 agent->set_os_lib(library); | |
3776 } | |
3777 | |
3778 // Find the OnLoad function. | |
3779 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
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3780 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, os::dll_lookup(library, on_load_symbols[symbol_index])); |
0 | 3781 if (on_load_entry != NULL) break; |
3782 } | |
3783 return on_load_entry; | |
3784 } | |
3785 | |
3786 // Find the JVM_OnLoad entry point | |
3787 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
3788 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
3789 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3790 } | |
3791 | |
3792 // Find the Agent_OnLoad entry point | |
3793 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
3794 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
3795 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3796 } | |
3797 | |
3798 // For backwards compatibility with -Xrun | |
3799 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
3800 // treated like -agentpath: | |
3801 // Must be called before agent libraries are created | |
3802 void Threads::convert_vm_init_libraries_to_agents() { | |
3803 AgentLibrary* agent; | |
3804 AgentLibrary* next; | |
3805 | |
3806 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
3807 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
3808 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3809 | |
3810 // If there is an JVM_OnLoad function it will get called later, | |
3811 // otherwise see if there is an Agent_OnLoad | |
3812 if (on_load_entry == NULL) { | |
3813 on_load_entry = lookup_agent_on_load(agent); | |
3814 if (on_load_entry != NULL) { | |
3815 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
3816 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
3817 Arguments::convert_library_to_agent(agent); | |
3818 } else { | |
3819 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
3820 } | |
3821 } | |
3822 } | |
3823 } | |
3824 | |
3825 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
3826 // Invokes Agent_OnLoad | |
3827 // Called very early -- before JavaThreads exist | |
3828 void Threads::create_vm_init_agents() { | |
3829 extern struct JavaVM_ main_vm; | |
3830 AgentLibrary* agent; | |
3831 | |
3832 JvmtiExport::enter_onload_phase(); | |
6854
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3833 |
0 | 3834 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { |
3835 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
3836 | |
3837 if (on_load_entry != NULL) { | |
3838 // Invoke the Agent_OnLoad function | |
3839 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3840 if (err != JNI_OK) { | |
3841 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
3842 } | |
3843 } else { | |
3844 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
3845 } | |
3846 } | |
3847 JvmtiExport::enter_primordial_phase(); | |
3848 } | |
3849 | |
3850 extern "C" { | |
3851 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
3852 } | |
3853 | |
3854 void Threads::shutdown_vm_agents() { | |
3855 // Send any Agent_OnUnload notifications | |
3856 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
3857 extern struct JavaVM_ main_vm; | |
3858 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3859 | |
3860 // Find the Agent_OnUnload function. | |
3861 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
3862 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
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|
3863 os::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
0 | 3864 |
3865 // Invoke the Agent_OnUnload function | |
3866 if (unload_entry != NULL) { | |
3867 JavaThread* thread = JavaThread::current(); | |
3868 ThreadToNativeFromVM ttn(thread); | |
3869 HandleMark hm(thread); | |
3870 (*unload_entry)(&main_vm); | |
3871 break; | |
3872 } | |
3873 } | |
3874 } | |
3875 } | |
3876 | |
3877 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
3878 // Invokes JVM_OnLoad | |
3879 void Threads::create_vm_init_libraries() { | |
3880 extern struct JavaVM_ main_vm; | |
3881 AgentLibrary* agent; | |
3882 | |
3883 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
3884 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3885 | |
3886 if (on_load_entry != NULL) { | |
3887 // Invoke the JVM_OnLoad function | |
3888 JavaThread* thread = JavaThread::current(); | |
3889 ThreadToNativeFromVM ttn(thread); | |
3890 HandleMark hm(thread); | |
3891 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3892 if (err != JNI_OK) { | |
3893 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
3894 } | |
3895 } else { | |
3896 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
3897 } | |
3898 } | |
3899 } | |
3900 | |
3901 // Last thread running calls java.lang.Shutdown.shutdown() | |
3902 void JavaThread::invoke_shutdown_hooks() { | |
3903 HandleMark hm(this); | |
3904 | |
3905 // We could get here with a pending exception, if so clear it now. | |
3906 if (this->has_pending_exception()) { | |
3907 this->clear_pending_exception(); | |
3908 } | |
3909 | |
3910 EXCEPTION_MARK; | |
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3911 Klass* k = |
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3912 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
0 | 3913 THREAD); |
3914 if (k != NULL) { | |
3915 // SystemDictionary::resolve_or_null will return null if there was | |
3916 // an exception. If we cannot load the Shutdown class, just don't | |
3917 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
3918 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
3919 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
3920 // was called, the Shutdown class would have already been loaded | |
3921 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
3922 instanceKlassHandle shutdown_klass (THREAD, k); | |
3923 JavaValue result(T_VOID); | |
3924 JavaCalls::call_static(&result, | |
3925 shutdown_klass, | |
2177
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3926 vmSymbols::shutdown_method_name(), |
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3927 vmSymbols::void_method_signature(), |
0 | 3928 THREAD); |
3929 } | |
3930 CLEAR_PENDING_EXCEPTION; | |
3931 } | |
3932 | |
3933 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
3934 // the program falls off the end of main(). Another VM exit path is through | |
3935 // vm_exit() when the program calls System.exit() to return a value or when | |
3936 // there is a serious error in VM. The two shutdown paths are not exactly | |
3937 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
3938 // and VM_Exit op at VM level. | |
3939 // | |
3940 // Shutdown sequence: | |
6197 | 3941 // + Shutdown native memory tracking if it is on |
0 | 3942 // + Wait until we are the last non-daemon thread to execute |
3943 // <-- every thing is still working at this moment --> | |
3944 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
3945 // shutdown hooks, run finalizers if finalization-on-exit | |
3946 // + Call before_exit(), prepare for VM exit | |
3947 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
3948 // currently the only user of this mechanism is File.deleteOnExit()) | |
3949 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
3950 // post thread end and vm death events to JVMTI, | |
3951 // stop signal thread | |
3952 // + Call JavaThread::exit(), it will: | |
3953 // > release JNI handle blocks, remove stack guard pages | |
3954 // > remove this thread from Threads list | |
3955 // <-- no more Java code from this thread after this point --> | |
3956 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
3957 // the compiler threads at safepoint | |
3958 // <-- do not use anything that could get blocked by Safepoint --> | |
3959 // + Disable tracing at JNI/JVM barriers | |
3960 // + Set _vm_exited flag for threads that are still running native code | |
3961 // + Delete this thread | |
3962 // + Call exit_globals() | |
3963 // > deletes tty | |
3964 // > deletes PerfMemory resources | |
3965 // + Return to caller | |
3966 | |
3967 bool Threads::destroy_vm() { | |
3968 JavaThread* thread = JavaThread::current(); | |
3969 | |
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3970 #ifdef ASSERT |
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3971 _vm_complete = false; |
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3972 #endif |
0 | 3973 // Wait until we are the last non-daemon thread to execute |
3974 { MutexLocker nu(Threads_lock); | |
3975 while (Threads::number_of_non_daemon_threads() > 1 ) | |
3976 // This wait should make safepoint checks, wait without a timeout, | |
3977 // and wait as a suspend-equivalent condition. | |
3978 // | |
3979 // Note: If the FlatProfiler is running and this thread is waiting | |
3980 // for another non-daemon thread to finish, then the FlatProfiler | |
3981 // is waiting for the external suspend request on this thread to | |
3982 // complete. wait_for_ext_suspend_completion() will eventually | |
3983 // timeout, but that takes time. Making this wait a suspend- | |
3984 // equivalent condition solves that timeout problem. | |
3985 // | |
3986 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
3987 Mutex::_as_suspend_equivalent_flag); | |
3988 } | |
3989 | |
3990 // Hang forever on exit if we are reporting an error. | |
3991 if (ShowMessageBoxOnError && is_error_reported()) { | |
3992 os::infinite_sleep(); | |
3993 } | |
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3994 os::wait_for_keypress_at_exit(); |
0 | 3995 |
3996 if (JDK_Version::is_jdk12x_version()) { | |
3997 // We are the last thread running, so check if finalizers should be run. | |
3998 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
3999 HandleMark rm(thread); | |
4000 Universe::run_finalizers_on_exit(); | |
4001 } else { | |
4002 // run Java level shutdown hooks | |
4003 thread->invoke_shutdown_hooks(); | |
4004 } | |
4005 | |
4006 before_exit(thread); | |
4007 | |
4008 thread->exit(true); | |
4009 | |
4010 // Stop VM thread. | |
4011 { | |
4012 // 4945125 The vm thread comes to a safepoint during exit. | |
4013 // GC vm_operations can get caught at the safepoint, and the | |
4014 // heap is unparseable if they are caught. Grab the Heap_lock | |
4015 // to prevent this. The GC vm_operations will not be able to | |
4016 // queue until after the vm thread is dead. | |
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4017 // After this point, we'll never emerge out of the safepoint before |
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4018 // the VM exits, so concurrent GC threads do not need to be explicitly |
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4019 // stopped; they remain inactive until the process exits. |
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4020 // Note: some concurrent G1 threads may be running during a safepoint, |
ef2d1b8f2dd4
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4021 // but these will not be accessing the heap, just some G1-specific side |
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4022 // data structures that are not accessed by any other threads but them |
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4023 // after this point in a terminal safepoint. |
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|
4024 |
0 | 4025 MutexLocker ml(Heap_lock); |
4026 | |
4027 VMThread::wait_for_vm_thread_exit(); | |
4028 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
4029 VMThread::destroy(); | |
4030 } | |
4031 | |
4032 // clean up ideal graph printers | |
4033 #if defined(COMPILER2) && !defined(PRODUCT) | |
4034 IdealGraphPrinter::clean_up(); | |
4035 #endif | |
4036 | |
4037 // Now, all Java threads are gone except daemon threads. Daemon threads | |
4038 // running Java code or in VM are stopped by the Safepoint. However, | |
4039 // daemon threads executing native code are still running. But they | |
4040 // will be stopped at native=>Java/VM barriers. Note that we can't | |
4041 // simply kill or suspend them, as it is inherently deadlock-prone. | |
4042 | |
4043 #ifndef PRODUCT | |
4044 // disable function tracing at JNI/JVM barriers | |
4045 TraceJNICalls = false; | |
4046 TraceJVMCalls = false; | |
4047 TraceRuntimeCalls = false; | |
4048 #endif | |
4049 | |
4050 VM_Exit::set_vm_exited(); | |
4051 | |
4052 notify_vm_shutdown(); | |
4053 | |
4054 delete thread; | |
4055 | |
4056 // exit_globals() will delete tty | |
4057 exit_globals(); | |
4058 | |
4059 return true; | |
4060 } | |
4061 | |
4062 | |
4063 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
4064 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
4065 return is_supported_jni_version(version); | |
4066 } | |
4067 | |
4068 | |
4069 jboolean Threads::is_supported_jni_version(jint version) { | |
4070 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
4071 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
4072 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
4073 return JNI_FALSE; | |
4074 } | |
4075 | |
4076 | |
4077 void Threads::add(JavaThread* p, bool force_daemon) { | |
4078 // The threads lock must be owned at this point | |
4079 assert_locked_or_safepoint(Threads_lock); | |
1842
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4080 |
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4081 // See the comment for this method in thread.hpp for its purpose and |
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4082 // why it is called here. |
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4083 p->initialize_queues(); |
0 | 4084 p->set_next(_thread_list); |
4085 _thread_list = p; | |
4086 _number_of_threads++; | |
4087 oop threadObj = p->threadObj(); | |
4088 bool daemon = true; | |
4089 // Bootstrapping problem: threadObj can be null for initial | |
4090 // JavaThread (or for threads attached via JNI) | |
4091 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
4092 _number_of_non_daemon_threads++; | |
4093 daemon = false; | |
4094 } | |
4095 | |
6197 | 4096 p->set_safepoint_visible(true); |
4097 | |
0 | 4098 ThreadService::add_thread(p, daemon); |
4099 | |
4100 // Possible GC point. | |
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4101 Events::log(p, "Thread added: " INTPTR_FORMAT, p); |
0 | 4102 } |
4103 | |
4104 void Threads::remove(JavaThread* p) { | |
4105 // Extra scope needed for Thread_lock, so we can check | |
4106 // that we do not remove thread without safepoint code notice | |
4107 { MutexLocker ml(Threads_lock); | |
4108 | |
4109 assert(includes(p), "p must be present"); | |
4110 | |
4111 JavaThread* current = _thread_list; | |
4112 JavaThread* prev = NULL; | |
4113 | |
4114 while (current != p) { | |
4115 prev = current; | |
4116 current = current->next(); | |
4117 } | |
4118 | |
4119 if (prev) { | |
4120 prev->set_next(current->next()); | |
4121 } else { | |
4122 _thread_list = p->next(); | |
4123 } | |
4124 _number_of_threads--; | |
4125 oop threadObj = p->threadObj(); | |
4126 bool daemon = true; | |
4127 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
4128 _number_of_non_daemon_threads--; | |
4129 daemon = false; | |
4130 | |
4131 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
4132 // on destroy_vm will wake up. | |
4133 if (number_of_non_daemon_threads() == 1) | |
4134 Threads_lock->notify_all(); | |
4135 } | |
4136 ThreadService::remove_thread(p, daemon); | |
4137 | |
4138 // Make sure that safepoint code disregard this thread. This is needed since | |
4139 // the thread might mess around with locks after this point. This can cause it | |
4140 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
4141 // of this thread since it is removed from the queue. | |
4142 p->set_terminated_value(); | |
6197 | 4143 |
4144 // Now, this thread is not visible to safepoint | |
4145 p->set_safepoint_visible(false); | |
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4146 // once the thread becomes safepoint invisible, we can not use its per-thread |
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4147 // recorder. And Threads::do_threads() no longer walks this thread, so we have |
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4148 // to release its per-thread recorder here. |
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4149 MemTracker::thread_exiting(p); |
0 | 4150 } // unlock Threads_lock |
4151 | |
4152 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
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4153 Events::log(p, "Thread exited: " INTPTR_FORMAT, p); |
0 | 4154 } |
4155 | |
4156 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
4157 bool Threads::includes(JavaThread* p) { | |
4158 assert(Threads_lock->is_locked(), "sanity check"); | |
4159 ALL_JAVA_THREADS(q) { | |
4160 if (q == p ) { | |
4161 return true; | |
4162 } | |
4163 } | |
4164 return false; | |
4165 } | |
4166 | |
4167 // Operations on the Threads list for GC. These are not explicitly locked, | |
4168 // but the garbage collector must provide a safe context for them to run. | |
4169 // In particular, these things should never be called when the Threads_lock | |
4170 // is held by some other thread. (Note: the Safepoint abstraction also | |
4171 // uses the Threads_lock to gurantee this property. It also makes sure that | |
4172 // all threads gets blocked when exiting or starting). | |
4173 | |
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4174 void Threads::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
0 | 4175 ALL_JAVA_THREADS(p) { |
7179
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4176 p->oops_do(f, cld_f, cf); |
0 | 4177 } |
7179
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4178 VMThread::vm_thread()->oops_do(f, cld_f, cf); |
0 | 4179 } |
4180 | |
7179
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4181 void Threads::possibly_parallel_oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
0 | 4182 // Introduce a mechanism allowing parallel threads to claim threads as |
4183 // root groups. Overhead should be small enough to use all the time, | |
4184 // even in sequential code. | |
4185 SharedHeap* sh = SharedHeap::heap(); | |
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4186 // Cannot yet substitute active_workers for n_par_threads |
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4187 // because of G1CollectedHeap::verify() use of |
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4188 // SharedHeap::process_strong_roots(). n_par_threads == 0 will |
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4189 // turn off parallelism in process_strong_roots while active_workers |
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4190 // is being used for parallelism elsewhere. |
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4191 bool is_par = sh->n_par_threads() > 0; |
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4192 assert(!is_par || |
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4193 (SharedHeap::heap()->n_par_threads() == |
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4194 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
0 | 4195 int cp = SharedHeap::heap()->strong_roots_parity(); |
4196 ALL_JAVA_THREADS(p) { | |
4197 if (p->claim_oops_do(is_par, cp)) { | |
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4198 p->oops_do(f, cld_f, cf); |
0 | 4199 } |
4200 } | |
4201 VMThread* vmt = VMThread::vm_thread(); | |
3979
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4202 if (vmt->claim_oops_do(is_par, cp)) { |
7179
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4203 vmt->oops_do(f, cld_f, cf); |
3979
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4204 } |
0 | 4205 } |
4206 | |
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4207 #if INCLUDE_ALL_GCS |
0 | 4208 // Used by ParallelScavenge |
4209 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
4210 ALL_JAVA_THREADS(p) { | |
4211 q->enqueue(new ThreadRootsTask(p)); | |
4212 } | |
4213 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
4214 } | |
4215 | |
4216 // Used by Parallel Old | |
4217 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
4218 ALL_JAVA_THREADS(p) { | |
4219 q->enqueue(new ThreadRootsMarkingTask(p)); | |
4220 } | |
4221 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
4222 } | |
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4223 #endif // INCLUDE_ALL_GCS |
0 | 4224 |
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4225 void Threads::nmethods_do(CodeBlobClosure* cf) { |
0 | 4226 ALL_JAVA_THREADS(p) { |
989
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4227 p->nmethods_do(cf); |
0 | 4228 } |
989
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4229 VMThread::vm_thread()->nmethods_do(cf); |
0 | 4230 } |
4231 | |
6725
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4232 void Threads::metadata_do(void f(Metadata*)) { |
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6964458: Reimplement class meta-data storage to use native memory
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4233 ALL_JAVA_THREADS(p) { |
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6964458: Reimplement class meta-data storage to use native memory
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4234 p->metadata_do(f); |
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4235 } |
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4236 } |
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4237 |
0 | 4238 void Threads::gc_epilogue() { |
4239 ALL_JAVA_THREADS(p) { | |
4240 p->gc_epilogue(); | |
4241 } | |
4242 } | |
4243 | |
4244 void Threads::gc_prologue() { | |
4245 ALL_JAVA_THREADS(p) { | |
4246 p->gc_prologue(); | |
4247 } | |
4248 } | |
4249 | |
4250 void Threads::deoptimized_wrt_marked_nmethods() { | |
4251 ALL_JAVA_THREADS(p) { | |
4252 p->deoptimized_wrt_marked_nmethods(); | |
4253 } | |
4254 } | |
4255 | |
4256 | |
4257 // Get count Java threads that are waiting to enter the specified monitor. | |
4258 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
4259 address monitor, bool doLock) { | |
4260 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
4261 "must grab Threads_lock or be at safepoint"); | |
4262 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
4263 | |
4264 int i = 0; | |
4265 { | |
4266 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4267 ALL_JAVA_THREADS(p) { | |
4268 if (p->is_Compiler_thread()) continue; | |
4269 | |
4270 address pending = (address)p->current_pending_monitor(); | |
4271 if (pending == monitor) { // found a match | |
4272 if (i < count) result->append(p); // save the first count matches | |
4273 i++; | |
4274 } | |
4275 } | |
4276 } | |
4277 return result; | |
4278 } | |
4279 | |
4280 | |
4281 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
4282 assert(doLock || | |
4283 Threads_lock->owned_by_self() || | |
4284 SafepointSynchronize::is_at_safepoint(), | |
4285 "must grab Threads_lock or be at safepoint"); | |
4286 | |
4287 // NULL owner means not locked so we can skip the search | |
4288 if (owner == NULL) return NULL; | |
4289 | |
4290 { | |
4291 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4292 ALL_JAVA_THREADS(p) { | |
4293 // first, see if owner is the address of a Java thread | |
4294 if (owner == (address)p) return p; | |
4295 } | |
4296 } | |
4297 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
4298 if (UseHeavyMonitors) return NULL; | |
4299 | |
4300 // | |
4301 // If we didn't find a matching Java thread and we didn't force use of | |
4302 // heavyweight monitors, then the owner is the stack address of the | |
4303 // Lock Word in the owning Java thread's stack. | |
4304 // | |
4305 JavaThread* the_owner = NULL; | |
4306 { | |
4307 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4308 ALL_JAVA_THREADS(q) { | |
702
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6699669: Hotspot server leaves synchronized block with monitor in bad state
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|
4309 if (q->is_lock_owned(owner)) { |
0 | 4310 the_owner = q; |
702
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|
4311 break; |
0 | 4312 } |
4313 } | |
4314 } | |
4315 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
4316 return the_owner; | |
4317 } | |
4318 | |
4319 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
4320 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
4321 char buf[32]; | |
4322 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
4323 | |
4324 st->print_cr("Full thread dump %s (%s %s):", | |
4325 Abstract_VM_Version::vm_name(), | |
4326 Abstract_VM_Version::vm_release(), | |
4327 Abstract_VM_Version::vm_info_string() | |
4328 ); | |
4329 st->cr(); | |
4330 | |
8001
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|
4331 #if INCLUDE_ALL_GCS |
0 | 4332 // Dump concurrent locks |
4333 ConcurrentLocksDump concurrent_locks; | |
4334 if (print_concurrent_locks) { | |
4335 concurrent_locks.dump_at_safepoint(); | |
4336 } | |
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|
4337 #endif // INCLUDE_ALL_GCS |
0 | 4338 |
4339 ALL_JAVA_THREADS(p) { | |
4340 ResourceMark rm; | |
4341 p->print_on(st); | |
4342 if (print_stacks) { | |
4343 if (internal_format) { | |
4344 p->trace_stack(); | |
4345 } else { | |
4346 p->print_stack_on(st); | |
4347 } | |
4348 } | |
4349 st->cr(); | |
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|
4350 #if INCLUDE_ALL_GCS |
0 | 4351 if (print_concurrent_locks) { |
4352 concurrent_locks.print_locks_on(p, st); | |
4353 } | |
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|
4354 #endif // INCLUDE_ALL_GCS |
0 | 4355 } |
4356 | |
4357 VMThread::vm_thread()->print_on(st); | |
4358 st->cr(); | |
4359 Universe::heap()->print_gc_threads_on(st); | |
4360 WatcherThread* wt = WatcherThread::watcher_thread(); | |
6766 | 4361 if (wt != NULL) { |
4362 wt->print_on(st); | |
4363 st->cr(); | |
4364 } | |
0 | 4365 CompileBroker::print_compiler_threads_on(st); |
4366 st->flush(); | |
4367 } | |
4368 | |
4369 // Threads::print_on_error() is called by fatal error handler. It's possible | |
4370 // that VM is not at safepoint and/or current thread is inside signal handler. | |
4371 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
4372 // memory (even in resource area), it might deadlock the error handler. | |
4373 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
4374 bool found_current = false; | |
4375 st->print_cr("Java Threads: ( => current thread )"); | |
4376 ALL_JAVA_THREADS(thread) { | |
4377 bool is_current = (current == thread); | |
4378 found_current = found_current || is_current; | |
4379 | |
4380 st->print("%s", is_current ? "=>" : " "); | |
4381 | |
4382 st->print(PTR_FORMAT, thread); | |
4383 st->print(" "); | |
4384 thread->print_on_error(st, buf, buflen); | |
4385 st->cr(); | |
4386 } | |
4387 st->cr(); | |
4388 | |
4389 st->print_cr("Other Threads:"); | |
4390 if (VMThread::vm_thread()) { | |
4391 bool is_current = (current == VMThread::vm_thread()); | |
4392 found_current = found_current || is_current; | |
4393 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
4394 | |
4395 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
4396 st->print(" "); | |
4397 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
4398 st->cr(); | |
4399 } | |
4400 WatcherThread* wt = WatcherThread::watcher_thread(); | |
4401 if (wt != NULL) { | |
4402 bool is_current = (current == wt); | |
4403 found_current = found_current || is_current; | |
4404 st->print("%s", is_current ? "=>" : " "); | |
4405 | |
4406 st->print(PTR_FORMAT, wt); | |
4407 st->print(" "); | |
4408 wt->print_on_error(st, buf, buflen); | |
4409 st->cr(); | |
4410 } | |
4411 if (!found_current) { | |
4412 st->cr(); | |
4413 st->print("=>" PTR_FORMAT " (exited) ", current); | |
4414 current->print_on_error(st, buf, buflen); | |
4415 st->cr(); | |
4416 } | |
4417 } | |
4418 | |
1878 | 4419 // Internal SpinLock and Mutex |
4420 // Based on ParkEvent | |
4421 | |
4422 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
0 | 4423 // |
1878 | 4424 // We employ SpinLocks _only for low-contention, fixed-length |
4425 // short-duration critical sections where we're concerned | |
4426 // about native mutex_t or HotSpot Mutex:: latency. | |
4427 // The mux construct provides a spin-then-block mutual exclusion | |
4428 // mechanism. | |
4429 // | |
4430 // Testing has shown that contention on the ListLock guarding gFreeList | |
4431 // is common. If we implement ListLock as a simple SpinLock it's common | |
4432 // for the JVM to devolve to yielding with little progress. This is true | |
4433 // despite the fact that the critical sections protected by ListLock are | |
4434 // extremely short. | |
0 | 4435 // |
1878 | 4436 // TODO-FIXME: ListLock should be of type SpinLock. |
4437 // We should make this a 1st-class type, integrated into the lock | |
4438 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
4439 // should have sufficient padding to avoid false-sharing and excessive | |
4440 // cache-coherency traffic. | |
4441 | |
4442 | |
4443 typedef volatile int SpinLockT ; | |
4444 | |
4445 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
4446 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
4447 return ; // normal fast-path return | |
4448 } | |
4449 | |
4450 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
4451 TEVENT (SpinAcquire - ctx) ; | |
4452 int ctr = 0 ; | |
4453 int Yields = 0 ; | |
0 | 4454 for (;;) { |
1878 | 4455 while (*adr != 0) { |
4456 ++ctr ; | |
4457 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
4458 if (Yields > 5) { | |
4459 // Consider using a simple NakedSleep() instead. | |
4460 // Then SpinAcquire could be called by non-JVM threads | |
4461 Thread::current()->_ParkEvent->park(1) ; | |
4462 } else { | |
4463 os::NakedYield() ; | |
4464 ++Yields ; | |
4465 } | |
4466 } else { | |
4467 SpinPause() ; | |
0 | 4468 } |
1878 | 4469 } |
4470 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
0 | 4471 } |
4472 } | |
4473 | |
1878 | 4474 void Thread::SpinRelease (volatile int * adr) { |
4475 assert (*adr != 0, "invariant") ; | |
4476 OrderAccess::fence() ; // guarantee at least release consistency. | |
4477 // Roach-motel semantics. | |
4478 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
4479 // but prior LDs and STs within the critical section can't be allowed | |
4480 // to reorder or float past the ST that releases the lock. | |
4481 *adr = 0 ; | |
0 | 4482 } |
4483 | |
1878 | 4484 // muxAcquire and muxRelease: |
4485 // | |
4486 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
4487 // The LSB of the word is set IFF the lock is held. | |
4488 // The remainder of the word points to the head of a singly-linked list | |
4489 // of threads blocked on the lock. | |
4490 // | |
4491 // * The current implementation of muxAcquire-muxRelease uses its own | |
4492 // dedicated Thread._MuxEvent instance. If we're interested in | |
4493 // minimizing the peak number of extant ParkEvent instances then | |
4494 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
4495 // as certain invariants were satisfied. Specifically, care would need | |
4496 // to be taken with regards to consuming unpark() "permits". | |
4497 // A safe rule of thumb is that a thread would never call muxAcquire() | |
4498 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
4499 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
4500 // consume an unpark() permit intended for monitorenter, for instance. | |
4501 // One way around this would be to widen the restricted-range semaphore | |
4502 // implemented in park(). Another alternative would be to provide | |
4503 // multiple instances of the PlatformEvent() for each thread. One | |
4504 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
4505 // | |
4506 // * Usage: | |
4507 // -- Only as leaf locks | |
4508 // -- for short-term locking only as muxAcquire does not perform | |
4509 // thread state transitions. | |
4510 // | |
4511 // Alternatives: | |
4512 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
4513 // but with parking or spin-then-park instead of pure spinning. | |
4514 // * Use Taura-Oyama-Yonenzawa locks. | |
4515 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
4516 // (List,LockByte). Acquire will CAS the full lockword while Release | |
4517 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
4518 // acquiring threads use timers (ParkTimed) to detect and recover from | |
4519 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
4520 // boundaries by using placement-new. | |
4521 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
4522 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
4523 // The validity of the backlinks must be ratified before we trust the value. | |
4524 // If the backlinks are invalid the exiting thread must back-track through the | |
4525 // the forward links, which are always trustworthy. | |
4526 // * Add a successor indication. The LockWord is currently encoded as | |
4527 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
4528 // to provide the usual futile-wakeup optimization. | |
4529 // See RTStt for details. | |
4530 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
4531 // | |
4532 | |
4533 | |
4534 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
4535 enum MuxBits { LOCKBIT = 1 } ; | |
4536 | |
4537 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
4538 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4539 if (w == 0) return ; | |
4540 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4541 return ; | |
4542 } | |
4543 | |
4544 TEVENT (muxAcquire - Contention) ; | |
4545 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
4546 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
0 | 4547 for (;;) { |
1878 | 4548 int its = (os::is_MP() ? 100 : 0) + 1 ; |
4549 | |
4550 // Optional spin phase: spin-then-park strategy | |
4551 while (--its >= 0) { | |
4552 w = *Lock ; | |
4553 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4554 return ; | |
4555 } | |
4556 } | |
4557 | |
4558 Self->reset() ; | |
4559 Self->OnList = intptr_t(Lock) ; | |
4560 // The following fence() isn't _strictly necessary as the subsequent | |
4561 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4562 OrderAccess::fence(); | |
4563 for (;;) { | |
4564 w = *Lock ; | |
4565 if ((w & LOCKBIT) == 0) { | |
4566 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4567 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
4568 return ; | |
4569 } | |
4570 continue ; // Interference -- *Lock changed -- Just retry | |
0 | 4571 } |
1878 | 4572 assert (w & LOCKBIT, "invariant") ; |
4573 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4574 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
4575 } | |
4576 | |
4577 while (Self->OnList != 0) { | |
4578 Self->park() ; | |
4579 } | |
0 | 4580 } |
4581 } | |
4582 | |
1878 | 4583 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
4584 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4585 if (w == 0) return ; | |
4586 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4587 return ; | |
4588 } | |
4589 | |
4590 TEVENT (muxAcquire - Contention) ; | |
4591 ParkEvent * ReleaseAfter = NULL ; | |
4592 if (ev == NULL) { | |
4593 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
4594 } | |
4595 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
4596 for (;;) { | |
4597 guarantee (ev->OnList == 0, "invariant") ; | |
4598 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
4599 | |
4600 // Optional spin phase: spin-then-park strategy | |
4601 while (--its >= 0) { | |
4602 w = *Lock ; | |
4603 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4604 if (ReleaseAfter != NULL) { | |
4605 ParkEvent::Release (ReleaseAfter) ; | |
4606 } | |
4607 return ; | |
4608 } | |
4609 } | |
4610 | |
4611 ev->reset() ; | |
4612 ev->OnList = intptr_t(Lock) ; | |
4613 // The following fence() isn't _strictly necessary as the subsequent | |
4614 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4615 OrderAccess::fence(); | |
4616 for (;;) { | |
4617 w = *Lock ; | |
4618 if ((w & LOCKBIT) == 0) { | |
4619 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4620 ev->OnList = 0 ; | |
4621 // We call ::Release while holding the outer lock, thus | |
4622 // artificially lengthening the critical section. | |
4623 // Consider deferring the ::Release() until the subsequent unlock(), | |
4624 // after we've dropped the outer lock. | |
4625 if (ReleaseAfter != NULL) { | |
4626 ParkEvent::Release (ReleaseAfter) ; | |
4627 } | |
4628 return ; | |
4629 } | |
4630 continue ; // Interference -- *Lock changed -- Just retry | |
4631 } | |
4632 assert (w & LOCKBIT, "invariant") ; | |
4633 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4634 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
4635 } | |
4636 | |
4637 while (ev->OnList != 0) { | |
4638 ev->park() ; | |
4639 } | |
4640 } | |
4641 } | |
4642 | |
4643 // Release() must extract a successor from the list and then wake that thread. | |
4644 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
4645 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
4646 // Release() would : | |
4647 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
4648 // (B) Extract a successor from the private list "in-hand" | |
4649 // (C) attempt to CAS() the residual back into *Lock over null. | |
4650 // If there were any newly arrived threads and the CAS() would fail. | |
4651 // In that case Release() would detach the RATs, re-merge the list in-hand | |
4652 // with the RATs and repeat as needed. Alternately, Release() might | |
4653 // detach and extract a successor, but then pass the residual list to the wakee. | |
4654 // The wakee would be responsible for reattaching and remerging before it | |
4655 // competed for the lock. | |
4656 // | |
4657 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
4658 // multiple concurrent pushers, but only one popper or detacher. | |
4659 // This implementation pops from the head of the list. This is unfair, | |
4660 // but tends to provide excellent throughput as hot threads remain hot. | |
4661 // (We wake recently run threads first). | |
4662 | |
4663 void Thread::muxRelease (volatile intptr_t * Lock) { | |
4664 for (;;) { | |
4665 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
4666 assert (w & LOCKBIT, "invariant") ; | |
4667 if (w == LOCKBIT) return ; | |
4668 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
4669 assert (List != NULL, "invariant") ; | |
4670 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
4671 ParkEvent * nxt = List->ListNext ; | |
4672 | |
4673 // The following CAS() releases the lock and pops the head element. | |
4674 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
4675 continue ; | |
4676 } | |
4677 List->OnList = 0 ; | |
4678 OrderAccess::fence() ; | |
4679 List->unpark () ; | |
4680 return ; | |
4681 } | |
4682 } | |
4683 | |
4684 | |
0 | 4685 void Threads::verify() { |
4686 ALL_JAVA_THREADS(p) { | |
4687 p->verify(); | |
4688 } | |
4689 VMThread* thread = VMThread::vm_thread(); | |
4690 if (thread != NULL) thread->verify(); | |
4691 } |