Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/thread.cpp @ 6768:716e6ef4482a
7190089: NMT ON: NMT failed assertion on thread's stack base address
Summary: Solaris only, record stack info to NMT after stack size adjustment was made for primordial threads
Reviewed-by: kvn, acorn, coleenp
author | zgu |
---|---|
date | Mon, 17 Sep 2012 10:20:04 -0400 |
parents | 6dfc6a541338 |
children | c088e2e95e69 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/classLoader.hpp" | |
27 #include "classfile/javaClasses.hpp" | |
28 #include "classfile/systemDictionary.hpp" | |
29 #include "classfile/vmSymbols.hpp" | |
30 #include "code/scopeDesc.hpp" | |
31 #include "compiler/compileBroker.hpp" | |
32 #include "interpreter/interpreter.hpp" | |
33 #include "interpreter/linkResolver.hpp" | |
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34 #include "interpreter/oopMapCache.hpp" |
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35 #include "jvmtifiles/jvmtiEnv.hpp" |
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36 #include "memory/gcLocker.inline.hpp" |
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37 #include "memory/metaspaceShared.hpp" |
1972 | 38 #include "memory/oopFactory.hpp" |
39 #include "memory/universe.inline.hpp" | |
40 #include "oops/instanceKlass.hpp" | |
41 #include "oops/objArrayOop.hpp" | |
42 #include "oops/oop.inline.hpp" | |
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43 #include "oops/symbol.hpp" |
1972 | 44 #include "prims/jvm_misc.hpp" |
45 #include "prims/jvmtiExport.hpp" | |
46 #include "prims/jvmtiThreadState.hpp" | |
47 #include "prims/privilegedStack.hpp" | |
48 #include "runtime/aprofiler.hpp" | |
49 #include "runtime/arguments.hpp" | |
50 #include "runtime/biasedLocking.hpp" | |
51 #include "runtime/deoptimization.hpp" | |
52 #include "runtime/fprofiler.hpp" | |
53 #include "runtime/frame.inline.hpp" | |
54 #include "runtime/init.hpp" | |
55 #include "runtime/interfaceSupport.hpp" | |
56 #include "runtime/java.hpp" | |
57 #include "runtime/javaCalls.hpp" | |
58 #include "runtime/jniPeriodicChecker.hpp" | |
59 #include "runtime/memprofiler.hpp" | |
60 #include "runtime/mutexLocker.hpp" | |
61 #include "runtime/objectMonitor.hpp" | |
62 #include "runtime/osThread.hpp" | |
63 #include "runtime/safepoint.hpp" | |
64 #include "runtime/sharedRuntime.hpp" | |
65 #include "runtime/statSampler.hpp" | |
66 #include "runtime/stubRoutines.hpp" | |
67 #include "runtime/task.hpp" | |
68 #include "runtime/threadCritical.hpp" | |
69 #include "runtime/threadLocalStorage.hpp" | |
70 #include "runtime/vframe.hpp" | |
71 #include "runtime/vframeArray.hpp" | |
72 #include "runtime/vframe_hp.hpp" | |
73 #include "runtime/vmThread.hpp" | |
74 #include "runtime/vm_operations.hpp" | |
75 #include "services/attachListener.hpp" | |
76 #include "services/management.hpp" | |
6197 | 77 #include "services/memTracker.hpp" |
1972 | 78 #include "services/threadService.hpp" |
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79 #include "trace/traceEventTypes.hpp" |
1972 | 80 #include "utilities/defaultStream.hpp" |
81 #include "utilities/dtrace.hpp" | |
82 #include "utilities/events.hpp" | |
83 #include "utilities/preserveException.hpp" | |
84 #ifdef TARGET_OS_FAMILY_linux | |
85 # include "os_linux.inline.hpp" | |
86 # include "thread_linux.inline.hpp" | |
87 #endif | |
88 #ifdef TARGET_OS_FAMILY_solaris | |
89 # include "os_solaris.inline.hpp" | |
90 # include "thread_solaris.inline.hpp" | |
91 #endif | |
92 #ifdef TARGET_OS_FAMILY_windows | |
93 # include "os_windows.inline.hpp" | |
94 # include "thread_windows.inline.hpp" | |
95 #endif | |
3960 | 96 #ifdef TARGET_OS_FAMILY_bsd |
97 # include "os_bsd.inline.hpp" | |
98 # include "thread_bsd.inline.hpp" | |
99 #endif | |
1972 | 100 #ifndef SERIALGC |
101 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" | |
102 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
103 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
104 #endif | |
105 #ifdef COMPILER1 | |
106 #include "c1/c1_Compiler.hpp" | |
107 #endif | |
108 #ifdef COMPILER2 | |
109 #include "opto/c2compiler.hpp" | |
110 #include "opto/idealGraphPrinter.hpp" | |
111 #endif | |
0 | 112 |
113 #ifdef DTRACE_ENABLED | |
114 | |
115 // Only bother with this argument setup if dtrace is available | |
116 | |
4006 | 117 #ifndef USDT2 |
0 | 118 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); |
119 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
120 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
121 intptr_t, intptr_t, bool); | |
122 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
123 intptr_t, intptr_t, bool); | |
124 | |
125 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
126 { \ | |
127 ResourceMark rm(this); \ | |
128 int len = 0; \ | |
129 const char* name = (javathread)->get_thread_name(); \ | |
130 len = strlen(name); \ | |
131 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
132 name, len, \ | |
133 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
134 (javathread)->osthread()->thread_id(), \ | |
135 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
136 } | |
137 | |
4006 | 138 #else /* USDT2 */ |
139 | |
140 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_PROBE_START | |
141 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_PROBE_STOP | |
142 | |
143 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
144 { \ | |
145 ResourceMark rm(this); \ | |
146 int len = 0; \ | |
147 const char* name = (javathread)->get_thread_name(); \ | |
148 len = strlen(name); \ | |
149 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \ | |
150 (char *) name, len, \ | |
151 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
152 (uintptr_t) (javathread)->osthread()->thread_id(), \ | |
153 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
154 } | |
155 | |
156 #endif /* USDT2 */ | |
157 | |
0 | 158 #else // ndef DTRACE_ENABLED |
159 | |
160 #define DTRACE_THREAD_PROBE(probe, javathread) | |
161 | |
162 #endif // ndef DTRACE_ENABLED | |
163 | |
6197 | 164 |
0 | 165 // Class hierarchy |
166 // - Thread | |
167 // - VMThread | |
168 // - WatcherThread | |
169 // - ConcurrentMarkSweepThread | |
170 // - JavaThread | |
171 // - CompilerThread | |
172 | |
173 // ======= Thread ======== | |
174 // Support for forcing alignment of thread objects for biased locking | |
6197 | 175 void* Thread::allocate(size_t size, bool throw_excpt, MEMFLAGS flags) { |
0 | 176 if (UseBiasedLocking) { |
177 const int alignment = markOopDesc::biased_lock_alignment; | |
178 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
6197 | 179 void* real_malloc_addr = throw_excpt? AllocateHeap(aligned_size, flags, CURRENT_PC) |
180 : os::malloc(aligned_size, flags, CURRENT_PC); | |
0 | 181 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); |
182 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
183 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
184 "JavaThread alignment code overflowed allocated storage"); | |
185 if (TraceBiasedLocking) { | |
186 if (aligned_addr != real_malloc_addr) | |
187 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
188 real_malloc_addr, aligned_addr); | |
189 } | |
190 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
191 return aligned_addr; | |
192 } else { | |
6197 | 193 return throw_excpt? AllocateHeap(size, flags, CURRENT_PC) |
194 : os::malloc(size, flags, CURRENT_PC); | |
0 | 195 } |
196 } | |
197 | |
198 void Thread::operator delete(void* p) { | |
199 if (UseBiasedLocking) { | |
200 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
6197 | 201 FreeHeap(real_malloc_addr, mtThread); |
0 | 202 } else { |
6197 | 203 FreeHeap(p, mtThread); |
0 | 204 } |
205 } | |
206 | |
207 | |
208 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
209 // JavaThread | |
210 | |
211 | |
212 Thread::Thread() { | |
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213 // stack and get_thread |
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214 set_stack_base(NULL); |
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215 set_stack_size(0); |
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216 set_self_raw_id(0); |
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217 set_lgrp_id(-1); |
0 | 218 |
219 // allocated data structures | |
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220 set_osthread(NULL); |
6197 | 221 set_resource_area(new (mtThread)ResourceArea()); |
222 set_handle_area(new (mtThread) HandleArea(NULL)); | |
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223 set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(300, true)); |
0 | 224 set_active_handles(NULL); |
225 set_free_handle_block(NULL); | |
226 set_last_handle_mark(NULL); | |
227 | |
228 // This initial value ==> never claimed. | |
229 _oops_do_parity = 0; | |
230 | |
231 // the handle mark links itself to last_handle_mark | |
232 new HandleMark(this); | |
233 | |
234 // plain initialization | |
235 debug_only(_owned_locks = NULL;) | |
236 debug_only(_allow_allocation_count = 0;) | |
237 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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238 NOT_PRODUCT(_skip_gcalot = false;) |
0 | 239 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
240 _jvmti_env_iteration_count = 0; | |
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241 set_allocated_bytes(0); |
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242 set_trace_buffer(NULL); |
0 | 243 _vm_operation_started_count = 0; |
244 _vm_operation_completed_count = 0; | |
245 _current_pending_monitor = NULL; | |
246 _current_pending_monitor_is_from_java = true; | |
247 _current_waiting_monitor = NULL; | |
248 _num_nested_signal = 0; | |
249 omFreeList = NULL ; | |
250 omFreeCount = 0 ; | |
251 omFreeProvision = 32 ; | |
1587 | 252 omInUseList = NULL ; |
253 omInUseCount = 0 ; | |
0 | 254 |
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255 #ifdef ASSERT |
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256 _visited_for_critical_count = false; |
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257 #endif |
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258 |
0 | 259 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); |
260 _suspend_flags = 0; | |
261 | |
262 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
263 _hashStateX = os::random() ; | |
264 _hashStateY = 842502087 ; | |
265 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
266 _hashStateW = 273326509 ; | |
267 | |
268 _OnTrap = 0 ; | |
269 _schedctl = NULL ; | |
270 _Stalled = 0 ; | |
271 _TypeTag = 0x2BAD ; | |
272 | |
273 // Many of the following fields are effectively final - immutable | |
274 // Note that nascent threads can't use the Native Monitor-Mutex | |
275 // construct until the _MutexEvent is initialized ... | |
276 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
277 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
278 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
279 // and ::Release() | |
280 _ParkEvent = ParkEvent::Allocate (this) ; | |
281 _SleepEvent = ParkEvent::Allocate (this) ; | |
282 _MutexEvent = ParkEvent::Allocate (this) ; | |
283 _MuxEvent = ParkEvent::Allocate (this) ; | |
284 | |
285 #ifdef CHECK_UNHANDLED_OOPS | |
286 if (CheckUnhandledOops) { | |
287 _unhandled_oops = new UnhandledOops(this); | |
288 } | |
289 #endif // CHECK_UNHANDLED_OOPS | |
290 #ifdef ASSERT | |
291 if (UseBiasedLocking) { | |
292 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
293 assert(this == _real_malloc_address || | |
294 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
295 "bug in forced alignment of thread objects"); | |
296 } | |
297 #endif /* ASSERT */ | |
298 } | |
299 | |
300 void Thread::initialize_thread_local_storage() { | |
301 // Note: Make sure this method only calls | |
302 // non-blocking operations. Otherwise, it might not work | |
303 // with the thread-startup/safepoint interaction. | |
304 | |
305 // During Java thread startup, safepoint code should allow this | |
306 // method to complete because it may need to allocate memory to | |
307 // store information for the new thread. | |
308 | |
309 // initialize structure dependent on thread local storage | |
310 ThreadLocalStorage::set_thread(this); | |
311 } | |
312 | |
313 void Thread::record_stack_base_and_size() { | |
314 set_stack_base(os::current_stack_base()); | |
315 set_stack_size(os::current_stack_size()); | |
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316 // CR 7190089: on Solaris, primordial thread's stack is adjusted |
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317 // in initialize_thread(). Without the adjustment, stack size is |
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318 // incorrect if stack is set to unlimited (ulimit -s unlimited). |
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319 // So far, only Solaris has real implementation of initialize_thread(). |
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320 // |
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321 // set up any platform-specific state. |
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322 os::initialize_thread(this); |
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323 |
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324 // record thread's native stack, stack grows downward |
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325 if (MemTracker::is_on()) { |
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326 address stack_low_addr = stack_base() - stack_size(); |
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327 MemTracker::record_thread_stack(stack_low_addr, stack_size(), this, |
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328 CURRENT_PC); |
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329 } |
0 | 330 } |
331 | |
332 | |
333 Thread::~Thread() { | |
334 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
335 ObjectSynchronizer::omFlush (this) ; | |
336 | |
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337 // stack_base can be NULL if the thread is never started or exited before |
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338 // record_stack_base_and_size called. Although, we would like to ensure |
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339 // that all started threads do call record_stack_base_and_size(), there is |
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340 // not proper way to enforce that. |
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341 if (_stack_base != NULL) { |
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342 address low_stack_addr = stack_base() - stack_size(); |
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343 MemTracker::release_thread_stack(low_stack_addr, stack_size(), this); |
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344 } |
6197 | 345 |
0 | 346 // deallocate data structures |
347 delete resource_area(); | |
348 // since the handle marks are using the handle area, we have to deallocated the root | |
349 // handle mark before deallocating the thread's handle area, | |
350 assert(last_handle_mark() != NULL, "check we have an element"); | |
351 delete last_handle_mark(); | |
352 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
353 | |
354 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
355 // We NULL out the fields for good hygiene. | |
356 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
357 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
358 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
359 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
360 | |
361 delete handle_area(); | |
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362 delete metadata_handles(); |
0 | 363 |
364 // osthread() can be NULL, if creation of thread failed. | |
365 if (osthread() != NULL) os::free_thread(osthread()); | |
366 | |
367 delete _SR_lock; | |
368 | |
369 // clear thread local storage if the Thread is deleting itself | |
370 if (this == Thread::current()) { | |
371 ThreadLocalStorage::set_thread(NULL); | |
372 } else { | |
373 // In the case where we're not the current thread, invalidate all the | |
374 // caches in case some code tries to get the current thread or the | |
375 // thread that was destroyed, and gets stale information. | |
376 ThreadLocalStorage::invalidate_all(); | |
377 } | |
378 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
379 } | |
380 | |
381 // NOTE: dummy function for assertion purpose. | |
382 void Thread::run() { | |
383 ShouldNotReachHere(); | |
384 } | |
385 | |
386 #ifdef ASSERT | |
387 // Private method to check for dangling thread pointer | |
388 void check_for_dangling_thread_pointer(Thread *thread) { | |
389 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
390 "possibility of dangling Thread pointer"); | |
391 } | |
392 #endif | |
393 | |
394 | |
395 #ifndef PRODUCT | |
396 // Tracing method for basic thread operations | |
397 void Thread::trace(const char* msg, const Thread* const thread) { | |
398 if (!TraceThreadEvents) return; | |
399 ResourceMark rm; | |
400 ThreadCritical tc; | |
401 const char *name = "non-Java thread"; | |
402 int prio = -1; | |
403 if (thread->is_Java_thread() | |
404 && !thread->is_Compiler_thread()) { | |
405 // The Threads_lock must be held to get information about | |
406 // this thread but may not be in some situations when | |
407 // tracing thread events. | |
408 bool release_Threads_lock = false; | |
409 if (!Threads_lock->owned_by_self()) { | |
410 Threads_lock->lock(); | |
411 release_Threads_lock = true; | |
412 } | |
413 JavaThread* jt = (JavaThread *)thread; | |
414 name = (char *)jt->get_thread_name(); | |
415 oop thread_oop = jt->threadObj(); | |
416 if (thread_oop != NULL) { | |
417 prio = java_lang_Thread::priority(thread_oop); | |
418 } | |
419 if (release_Threads_lock) { | |
420 Threads_lock->unlock(); | |
421 } | |
422 } | |
423 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
424 } | |
425 #endif | |
426 | |
427 | |
428 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
429 trace("get priority", thread); | |
430 ThreadPriority priority; | |
431 // Can return an error! | |
432 (void)os::get_priority(thread, priority); | |
433 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
434 return priority; | |
435 } | |
436 | |
437 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
438 trace("set priority", thread); | |
439 debug_only(check_for_dangling_thread_pointer(thread);) | |
440 // Can return an error! | |
441 (void)os::set_priority(thread, priority); | |
442 } | |
443 | |
444 | |
445 void Thread::start(Thread* thread) { | |
446 trace("start", thread); | |
447 // Start is different from resume in that its safety is guaranteed by context or | |
448 // being called from a Java method synchronized on the Thread object. | |
449 if (!DisableStartThread) { | |
450 if (thread->is_Java_thread()) { | |
451 // Initialize the thread state to RUNNABLE before starting this thread. | |
452 // Can not set it after the thread started because we do not know the | |
453 // exact thread state at that time. It could be in MONITOR_WAIT or | |
454 // in SLEEPING or some other state. | |
455 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
456 java_lang_Thread::RUNNABLE); | |
457 } | |
458 os::start_thread(thread); | |
459 } | |
460 } | |
461 | |
462 // Enqueue a VM_Operation to do the job for us - sometime later | |
463 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
464 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
465 VMThread::execute(vm_stop); | |
466 } | |
467 | |
468 | |
469 // | |
470 // Check if an external suspend request has completed (or has been | |
471 // cancelled). Returns true if the thread is externally suspended and | |
472 // false otherwise. | |
473 // | |
474 // The bits parameter returns information about the code path through | |
475 // the routine. Useful for debugging: | |
476 // | |
477 // set in is_ext_suspend_completed(): | |
478 // 0x00000001 - routine was entered | |
479 // 0x00000010 - routine return false at end | |
480 // 0x00000100 - thread exited (return false) | |
481 // 0x00000200 - suspend request cancelled (return false) | |
482 // 0x00000400 - thread suspended (return true) | |
483 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
484 // 0x00002000 - thread is native and walkable (return true) | |
485 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
486 // | |
487 // set in wait_for_ext_suspend_completion(): | |
488 // 0x00010000 - routine was entered | |
489 // 0x00020000 - suspend request cancelled before loop (return false) | |
490 // 0x00040000 - thread suspended before loop (return true) | |
491 // 0x00080000 - suspend request cancelled in loop (return false) | |
492 // 0x00100000 - thread suspended in loop (return true) | |
493 // 0x00200000 - suspend not completed during retry loop (return false) | |
494 // | |
495 | |
496 // Helper class for tracing suspend wait debug bits. | |
497 // | |
498 // 0x00000100 indicates that the target thread exited before it could | |
499 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
500 // 0x00080000 each indicate a cancelled suspend request so they don't | |
501 // count as wait failures either. | |
502 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
503 | |
504 class TraceSuspendDebugBits : public StackObj { | |
505 private: | |
506 JavaThread * jt; | |
507 bool is_wait; | |
508 bool called_by_wait; // meaningful when !is_wait | |
509 uint32_t * bits; | |
510 | |
511 public: | |
512 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
513 uint32_t *_bits) { | |
514 jt = _jt; | |
515 is_wait = _is_wait; | |
516 called_by_wait = _called_by_wait; | |
517 bits = _bits; | |
518 } | |
519 | |
520 ~TraceSuspendDebugBits() { | |
521 if (!is_wait) { | |
522 #if 1 | |
523 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
524 // That trace is very chatty. | |
525 return; | |
526 #else | |
527 if (!called_by_wait) { | |
528 // If tracing for is_ext_suspend_completed() is enabled, then only | |
529 // trace calls to it from wait_for_ext_suspend_completion() | |
530 return; | |
531 } | |
532 #endif | |
533 } | |
534 | |
535 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
536 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
537 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
538 ResourceMark rm; | |
539 | |
540 tty->print_cr( | |
541 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
542 jt->get_thread_name(), *bits); | |
543 | |
544 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
545 } | |
546 } | |
547 } | |
548 }; | |
549 #undef DEBUG_FALSE_BITS | |
550 | |
551 | |
552 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
553 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
554 | |
555 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
556 bool do_trans_retry; // flag to force the retry | |
557 | |
558 *bits |= 0x00000001; | |
559 | |
560 do { | |
561 do_trans_retry = false; | |
562 | |
563 if (is_exiting()) { | |
564 // Thread is in the process of exiting. This is always checked | |
565 // first to reduce the risk of dereferencing a freed JavaThread. | |
566 *bits |= 0x00000100; | |
567 return false; | |
568 } | |
569 | |
570 if (!is_external_suspend()) { | |
571 // Suspend request is cancelled. This is always checked before | |
572 // is_ext_suspended() to reduce the risk of a rogue resume | |
573 // confusing the thread that made the suspend request. | |
574 *bits |= 0x00000200; | |
575 return false; | |
576 } | |
577 | |
578 if (is_ext_suspended()) { | |
579 // thread is suspended | |
580 *bits |= 0x00000400; | |
581 return true; | |
582 } | |
583 | |
584 // Now that we no longer do hard suspends of threads running | |
585 // native code, the target thread can be changing thread state | |
586 // while we are in this routine: | |
587 // | |
588 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
589 // | |
590 // We save a copy of the thread state as observed at this moment | |
591 // and make our decision about suspend completeness based on the | |
592 // copy. This closes the race where the thread state is seen as | |
593 // _thread_in_native_trans in the if-thread_blocked check, but is | |
594 // seen as _thread_blocked in if-thread_in_native_trans check. | |
595 JavaThreadState save_state = thread_state(); | |
596 | |
597 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
598 // If the thread's state is _thread_blocked and this blocking | |
599 // condition is known to be equivalent to a suspend, then we can | |
600 // consider the thread to be externally suspended. This means that | |
601 // the code that sets _thread_blocked has been modified to do | |
602 // self-suspension if the blocking condition releases. We also | |
603 // used to check for CONDVAR_WAIT here, but that is now covered by | |
604 // the _thread_blocked with self-suspension check. | |
605 // | |
606 // Return true since we wouldn't be here unless there was still an | |
607 // external suspend request. | |
608 *bits |= 0x00001000; | |
609 return true; | |
610 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
611 // Threads running native code will self-suspend on native==>VM/Java | |
612 // transitions. If its stack is walkable (should always be the case | |
613 // unless this function is called before the actual java_suspend() | |
614 // call), then the wait is done. | |
615 *bits |= 0x00002000; | |
616 return true; | |
617 } else if (!called_by_wait && !did_trans_retry && | |
618 save_state == _thread_in_native_trans && | |
619 frame_anchor()->walkable()) { | |
620 // The thread is transitioning from thread_in_native to another | |
621 // thread state. check_safepoint_and_suspend_for_native_trans() | |
622 // will force the thread to self-suspend. If it hasn't gotten | |
623 // there yet we may have caught the thread in-between the native | |
624 // code check above and the self-suspend. Lucky us. If we were | |
625 // called by wait_for_ext_suspend_completion(), then it | |
626 // will be doing the retries so we don't have to. | |
627 // | |
628 // Since we use the saved thread state in the if-statement above, | |
629 // there is a chance that the thread has already transitioned to | |
630 // _thread_blocked by the time we get here. In that case, we will | |
631 // make a single unnecessary pass through the logic below. This | |
632 // doesn't hurt anything since we still do the trans retry. | |
633 | |
634 *bits |= 0x00004000; | |
635 | |
636 // Once the thread leaves thread_in_native_trans for another | |
637 // thread state, we break out of this retry loop. We shouldn't | |
638 // need this flag to prevent us from getting back here, but | |
639 // sometimes paranoia is good. | |
640 did_trans_retry = true; | |
641 | |
642 // We wait for the thread to transition to a more usable state. | |
643 for (int i = 1; i <= SuspendRetryCount; i++) { | |
644 // We used to do an "os::yield_all(i)" call here with the intention | |
645 // that yielding would increase on each retry. However, the parameter | |
646 // is ignored on Linux which means the yield didn't scale up. Waiting | |
647 // on the SR_lock below provides a much more predictable scale up for | |
648 // the delay. It also provides a simple/direct point to check for any | |
649 // safepoint requests from the VMThread | |
650 | |
651 // temporarily drops SR_lock while doing wait with safepoint check | |
652 // (if we're a JavaThread - the WatcherThread can also call this) | |
653 // and increase delay with each retry | |
654 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
655 | |
656 // check the actual thread state instead of what we saved above | |
657 if (thread_state() != _thread_in_native_trans) { | |
658 // the thread has transitioned to another thread state so | |
659 // try all the checks (except this one) one more time. | |
660 do_trans_retry = true; | |
661 break; | |
662 } | |
663 } // end retry loop | |
664 | |
665 | |
666 } | |
667 } while (do_trans_retry); | |
668 | |
669 *bits |= 0x00000010; | |
670 return false; | |
671 } | |
672 | |
673 // | |
674 // Wait for an external suspend request to complete (or be cancelled). | |
675 // Returns true if the thread is externally suspended and false otherwise. | |
676 // | |
677 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
678 uint32_t *bits) { | |
679 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
680 false /* !called_by_wait */, bits); | |
681 | |
682 // local flag copies to minimize SR_lock hold time | |
683 bool is_suspended; | |
684 bool pending; | |
685 uint32_t reset_bits; | |
686 | |
687 // set a marker so is_ext_suspend_completed() knows we are the caller | |
688 *bits |= 0x00010000; | |
689 | |
690 // We use reset_bits to reinitialize the bits value at the top of | |
691 // each retry loop. This allows the caller to make use of any | |
692 // unused bits for their own marking purposes. | |
693 reset_bits = *bits; | |
694 | |
695 { | |
696 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
697 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
698 delay, bits); | |
699 pending = is_external_suspend(); | |
700 } | |
701 // must release SR_lock to allow suspension to complete | |
702 | |
703 if (!pending) { | |
704 // A cancelled suspend request is the only false return from | |
705 // is_ext_suspend_completed() that keeps us from entering the | |
706 // retry loop. | |
707 *bits |= 0x00020000; | |
708 return false; | |
709 } | |
710 | |
711 if (is_suspended) { | |
712 *bits |= 0x00040000; | |
713 return true; | |
714 } | |
715 | |
716 for (int i = 1; i <= retries; i++) { | |
717 *bits = reset_bits; // reinit to only track last retry | |
718 | |
719 // We used to do an "os::yield_all(i)" call here with the intention | |
720 // that yielding would increase on each retry. However, the parameter | |
721 // is ignored on Linux which means the yield didn't scale up. Waiting | |
722 // on the SR_lock below provides a much more predictable scale up for | |
723 // the delay. It also provides a simple/direct point to check for any | |
724 // safepoint requests from the VMThread | |
725 | |
726 { | |
727 MutexLocker ml(SR_lock()); | |
728 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
729 // can also call this) and increase delay with each retry | |
730 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
731 | |
732 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
733 delay, bits); | |
734 | |
735 // It is possible for the external suspend request to be cancelled | |
736 // (by a resume) before the actual suspend operation is completed. | |
737 // Refresh our local copy to see if we still need to wait. | |
738 pending = is_external_suspend(); | |
739 } | |
740 | |
741 if (!pending) { | |
742 // A cancelled suspend request is the only false return from | |
743 // is_ext_suspend_completed() that keeps us from staying in the | |
744 // retry loop. | |
745 *bits |= 0x00080000; | |
746 return false; | |
747 } | |
748 | |
749 if (is_suspended) { | |
750 *bits |= 0x00100000; | |
751 return true; | |
752 } | |
753 } // end retry loop | |
754 | |
755 // thread did not suspend after all our retries | |
756 *bits |= 0x00200000; | |
757 return false; | |
758 } | |
759 | |
760 #ifndef PRODUCT | |
761 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
762 | |
763 // This should not need to be atomic as the only way for simultaneous | |
764 // updates is via interrupts. Even then this should be rare or non-existant | |
765 // and we don't care that much anyway. | |
766 | |
767 int index = _jmp_ring_index; | |
768 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
769 _jmp_ring[index]._target = (intptr_t) target; | |
770 _jmp_ring[index]._instruction = (intptr_t) instr; | |
771 _jmp_ring[index]._file = file; | |
772 _jmp_ring[index]._line = line; | |
773 } | |
774 #endif /* PRODUCT */ | |
775 | |
776 // Called by flat profiler | |
777 // Callers have already called wait_for_ext_suspend_completion | |
778 // The assertion for that is currently too complex to put here: | |
779 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
780 bool gotframe = false; | |
781 // self suspension saves needed state. | |
782 if (has_last_Java_frame() && _anchor.walkable()) { | |
783 *_fr = pd_last_frame(); | |
784 gotframe = true; | |
785 } | |
786 return gotframe; | |
787 } | |
788 | |
789 void Thread::interrupt(Thread* thread) { | |
790 trace("interrupt", thread); | |
791 debug_only(check_for_dangling_thread_pointer(thread);) | |
792 os::interrupt(thread); | |
793 } | |
794 | |
795 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
796 trace("is_interrupted", thread); | |
797 debug_only(check_for_dangling_thread_pointer(thread);) | |
798 // Note: If clear_interrupted==false, this simply fetches and | |
799 // returns the value of the field osthread()->interrupted(). | |
800 return os::is_interrupted(thread, clear_interrupted); | |
801 } | |
802 | |
803 | |
804 // GC Support | |
805 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
806 jint thread_parity = _oops_do_parity; | |
807 if (thread_parity != strong_roots_parity) { | |
808 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
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809 if (res == thread_parity) { |
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810 return true; |
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811 } else { |
0 | 812 guarantee(res == strong_roots_parity, "Or else what?"); |
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813 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
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814 "Should only fail when parallel."); |
0 | 815 return false; |
816 } | |
817 } | |
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818 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
0 | 819 "Should only fail when parallel."); |
820 return false; | |
821 } | |
822 | |
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823 void Thread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 824 active_handles()->oops_do(f); |
825 // Do oop for ThreadShadow | |
826 f->do_oop((oop*)&_pending_exception); | |
827 handle_area()->oops_do(f); | |
828 } | |
829 | |
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830 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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831 // no nmethods in a generic thread... |
0 | 832 } |
833 | |
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834 void Thread::metadata_do(void f(Metadata*)) { |
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835 if (metadata_handles() != NULL) { |
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836 for (int i = 0; i< metadata_handles()->length(); i++) { |
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837 f(metadata_handles()->at(i)); |
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838 } |
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839 } |
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840 } |
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841 |
0 | 842 void Thread::print_on(outputStream* st) const { |
843 // get_priority assumes osthread initialized | |
844 if (osthread() != NULL) { | |
845 st->print("prio=%d tid=" INTPTR_FORMAT " ", get_priority(this), this); | |
846 osthread()->print_on(st); | |
847 } | |
848 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
849 } | |
850 | |
851 // Thread::print_on_error() is called by fatal error handler. Don't use | |
852 // any lock or allocate memory. | |
853 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
854 if (is_VM_thread()) st->print("VMThread"); | |
855 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
856 else if (is_Java_thread()) st->print("JavaThread"); | |
857 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
858 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
859 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
860 else st->print("Thread"); | |
861 | |
862 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
863 _stack_base - _stack_size, _stack_base); | |
864 | |
865 if (osthread()) { | |
866 st->print(" [id=%d]", osthread()->thread_id()); | |
867 } | |
868 } | |
869 | |
870 #ifdef ASSERT | |
871 void Thread::print_owned_locks_on(outputStream* st) const { | |
872 Monitor *cur = _owned_locks; | |
873 if (cur == NULL) { | |
874 st->print(" (no locks) "); | |
875 } else { | |
876 st->print_cr(" Locks owned:"); | |
877 while(cur) { | |
878 cur->print_on(st); | |
879 cur = cur->next(); | |
880 } | |
881 } | |
882 } | |
883 | |
884 static int ref_use_count = 0; | |
885 | |
886 bool Thread::owns_locks_but_compiled_lock() const { | |
887 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
888 if (cur != Compile_lock) return true; | |
889 } | |
890 return false; | |
891 } | |
892 | |
893 | |
894 #endif | |
895 | |
896 #ifndef PRODUCT | |
897 | |
898 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
899 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
900 // no threads which allow_vm_block's are held | |
901 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
902 // Check if current thread is allowed to block at a safepoint | |
903 if (!(_allow_safepoint_count == 0)) | |
904 fatal("Possible safepoint reached by thread that does not allow it"); | |
905 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
906 fatal("LEAF method calling lock?"); | |
907 } | |
908 | |
909 #ifdef ASSERT | |
910 if (potential_vm_operation && is_Java_thread() | |
911 && !Universe::is_bootstrapping()) { | |
912 // Make sure we do not hold any locks that the VM thread also uses. | |
913 // This could potentially lead to deadlocks | |
914 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
915 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
916 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
917 // since it is used to transfer control between JavaThreads and the VMThread | |
918 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
919 if ( (cur->allow_vm_block() && | |
920 cur != Threads_lock && | |
921 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
922 cur != VMOperationRequest_lock && | |
923 cur != VMOperationQueue_lock) || | |
924 cur->rank() == Mutex::special) { | |
925 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
926 } | |
927 } | |
928 } | |
929 | |
930 if (GCALotAtAllSafepoints) { | |
931 // We could enter a safepoint here and thus have a gc | |
932 InterfaceSupport::check_gc_alot(); | |
933 } | |
934 #endif | |
935 } | |
936 #endif | |
937 | |
938 bool Thread::is_in_stack(address adr) const { | |
939 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
940 address end = os::current_stack_pointer(); | |
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941 // Allow non Java threads to call this without stack_base |
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942 if (_stack_base == NULL) return true; |
0 | 943 if (stack_base() >= adr && adr >= end) return true; |
944 | |
945 return false; | |
946 } | |
947 | |
948 | |
949 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter | |
950 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
951 // used for compilation in the future. If that change is made, the need for these methods | |
952 // should be revisited, and they should be removed if possible. | |
953 | |
954 bool Thread::is_lock_owned(address adr) const { | |
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955 return on_local_stack(adr); |
0 | 956 } |
957 | |
958 bool Thread::set_as_starting_thread() { | |
959 // NOTE: this must be called inside the main thread. | |
960 return os::create_main_thread((JavaThread*)this); | |
961 } | |
962 | |
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963 static void initialize_class(Symbol* class_name, TRAPS) { |
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964 Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
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965 InstanceKlass::cast(klass)->initialize(CHECK); |
0 | 966 } |
967 | |
968 | |
969 // Creates the initial ThreadGroup | |
970 static Handle create_initial_thread_group(TRAPS) { | |
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971 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
0 | 972 instanceKlassHandle klass (THREAD, k); |
973 | |
974 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
975 { | |
976 JavaValue result(T_VOID); | |
977 JavaCalls::call_special(&result, | |
978 system_instance, | |
979 klass, | |
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980 vmSymbols::object_initializer_name(), |
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981 vmSymbols::void_method_signature(), |
0 | 982 CHECK_NH); |
983 } | |
984 Universe::set_system_thread_group(system_instance()); | |
985 | |
986 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
987 { | |
988 JavaValue result(T_VOID); | |
989 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
990 JavaCalls::call_special(&result, | |
991 main_instance, | |
992 klass, | |
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993 vmSymbols::object_initializer_name(), |
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994 vmSymbols::threadgroup_string_void_signature(), |
0 | 995 system_instance, |
996 string, | |
997 CHECK_NH); | |
998 } | |
999 return main_instance; | |
1000 } | |
1001 | |
1002 // Creates the initial Thread | |
1003 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
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1004 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
0 | 1005 instanceKlassHandle klass (THREAD, k); |
1006 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
1007 | |
1008 java_lang_Thread::set_thread(thread_oop(), thread); | |
1009 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1010 thread->set_threadObj(thread_oop()); | |
1011 | |
1012 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
1013 | |
1014 JavaValue result(T_VOID); | |
1015 JavaCalls::call_special(&result, thread_oop, | |
1016 klass, | |
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1017 vmSymbols::object_initializer_name(), |
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1018 vmSymbols::threadgroup_string_void_signature(), |
0 | 1019 thread_group, |
1020 string, | |
1021 CHECK_NULL); | |
1022 return thread_oop(); | |
1023 } | |
1024 | |
1025 static void call_initializeSystemClass(TRAPS) { | |
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1026 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 1027 instanceKlassHandle klass (THREAD, k); |
1028 | |
1029 JavaValue result(T_VOID); | |
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1030 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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1031 vmSymbols::void_method_signature(), CHECK); |
0 | 1032 } |
1033 | |
6181 | 1034 char java_runtime_name[128] = ""; |
1035 | |
1036 // extract the JRE name from sun.misc.Version.java_runtime_name | |
1037 static const char* get_java_runtime_name(TRAPS) { | |
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1038 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
6181 | 1039 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
1040 fieldDescriptor fd; | |
1041 bool found = k != NULL && | |
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1042 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_name_name(), |
6181 | 1043 vmSymbols::string_signature(), &fd); |
1044 if (found) { | |
1045 oop name_oop = k->java_mirror()->obj_field(fd.offset()); | |
1046 if (name_oop == NULL) | |
1047 return NULL; | |
1048 const char* name = java_lang_String::as_utf8_string(name_oop, | |
1049 java_runtime_name, | |
1050 sizeof(java_runtime_name)); | |
1051 return name; | |
1052 } else { | |
1053 return NULL; | |
1054 } | |
1055 } | |
1056 | |
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1057 // General purpose hook into Java code, run once when the VM is initialized. |
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1058 // The Java library method itself may be changed independently from the VM. |
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1059 static void call_postVMInitHook(TRAPS) { |
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1060 Klass* k = SystemDictionary::PostVMInitHook_klass(); |
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1061 instanceKlassHandle klass (THREAD, k); |
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1062 if (klass.not_null()) { |
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1063 JavaValue result(T_VOID); |
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1064 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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1065 vmSymbols::void_method_signature(), |
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1066 CHECK); |
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1067 } |
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1068 } |
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1069 |
0 | 1070 static void reset_vm_info_property(TRAPS) { |
1071 // the vm info string | |
1072 ResourceMark rm(THREAD); | |
1073 const char *vm_info = VM_Version::vm_info_string(); | |
1074 | |
1075 // java.lang.System class | |
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1076 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 1077 instanceKlassHandle klass (THREAD, k); |
1078 | |
1079 // setProperty arguments | |
1080 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
1081 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
1082 | |
1083 // return value | |
1084 JavaValue r(T_OBJECT); | |
1085 | |
1086 // public static String setProperty(String key, String value); | |
1087 JavaCalls::call_static(&r, | |
1088 klass, | |
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1089 vmSymbols::setProperty_name(), |
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1090 vmSymbols::string_string_string_signature(), |
0 | 1091 key_str, |
1092 value_str, | |
1093 CHECK); | |
1094 } | |
1095 | |
1096 | |
1097 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
1098 assert(thread_group.not_null(), "thread group should be specified"); | |
1099 assert(threadObj() == NULL, "should only create Java thread object once"); | |
1100 | |
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1101 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
0 | 1102 instanceKlassHandle klass (THREAD, k); |
1103 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
1104 | |
1105 java_lang_Thread::set_thread(thread_oop(), this); | |
1106 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1107 set_threadObj(thread_oop()); | |
1108 | |
1109 JavaValue result(T_VOID); | |
1110 if (thread_name != NULL) { | |
1111 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
1112 // Thread gets assigned specified name and null target | |
1113 JavaCalls::call_special(&result, | |
1114 thread_oop, | |
1115 klass, | |
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1116 vmSymbols::object_initializer_name(), |
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1117 vmSymbols::threadgroup_string_void_signature(), |
0 | 1118 thread_group, // Argument 1 |
1119 name, // Argument 2 | |
1120 THREAD); | |
1121 } else { | |
1122 // Thread gets assigned name "Thread-nnn" and null target | |
1123 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
1124 JavaCalls::call_special(&result, | |
1125 thread_oop, | |
1126 klass, | |
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1127 vmSymbols::object_initializer_name(), |
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1128 vmSymbols::threadgroup_runnable_void_signature(), |
0 | 1129 thread_group, // Argument 1 |
1130 Handle(), // Argument 2 | |
1131 THREAD); | |
1132 } | |
1133 | |
1134 | |
1135 if (daemon) { | |
1136 java_lang_Thread::set_daemon(thread_oop()); | |
1137 } | |
1138 | |
1139 if (HAS_PENDING_EXCEPTION) { | |
1140 return; | |
1141 } | |
1142 | |
1142 | 1143 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
0 | 1144 Handle threadObj(this, this->threadObj()); |
1145 | |
1146 JavaCalls::call_special(&result, | |
1147 thread_group, | |
1148 group, | |
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1149 vmSymbols::add_method_name(), |
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1150 vmSymbols::thread_void_signature(), |
0 | 1151 threadObj, // Arg 1 |
1152 THREAD); | |
1153 | |
1154 | |
1155 } | |
1156 | |
1157 // NamedThread -- non-JavaThread subclasses with multiple | |
1158 // uniquely named instances should derive from this. | |
1159 NamedThread::NamedThread() : Thread() { | |
1160 _name = NULL; | |
1119
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1161 _processed_thread = NULL; |
0 | 1162 } |
1163 | |
1164 NamedThread::~NamedThread() { | |
1165 if (_name != NULL) { | |
6197 | 1166 FREE_C_HEAP_ARRAY(char, _name, mtThread); |
0 | 1167 _name = NULL; |
1168 } | |
1169 } | |
1170 | |
1171 void NamedThread::set_name(const char* format, ...) { | |
1172 guarantee(_name == NULL, "Only get to set name once."); | |
6197 | 1173 _name = NEW_C_HEAP_ARRAY(char, max_name_len, mtThread); |
0 | 1174 guarantee(_name != NULL, "alloc failure"); |
1175 va_list ap; | |
1176 va_start(ap, format); | |
1177 jio_vsnprintf(_name, max_name_len, format, ap); | |
1178 va_end(ap); | |
1179 } | |
1180 | |
1181 // ======= WatcherThread ======== | |
1182 | |
1183 // The watcher thread exists to simulate timer interrupts. It should | |
1184 // be replaced by an abstraction over whatever native support for | |
1185 // timer interrupts exists on the platform. | |
1186 | |
1187 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
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1188 volatile bool WatcherThread::_should_terminate = false; |
0 | 1189 |
1190 WatcherThread::WatcherThread() : Thread() { | |
1191 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); | |
1192 if (os::create_thread(this, os::watcher_thread)) { | |
1193 _watcher_thread = this; | |
1194 | |
1195 // Set the watcher thread to the highest OS priority which should not be | |
1196 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
1197 // is created. The only normal thread using this priority is the reference | |
1198 // handler thread, which runs for very short intervals only. | |
1199 // If the VMThread's priority is not lower than the WatcherThread profiling | |
1200 // will be inaccurate. | |
1201 os::set_priority(this, MaxPriority); | |
1202 if (!DisableStartThread) { | |
1203 os::start_thread(this); | |
1204 } | |
1205 } | |
1206 } | |
1207 | |
1208 void WatcherThread::run() { | |
1209 assert(this == watcher_thread(), "just checking"); | |
1210 | |
1211 this->record_stack_base_and_size(); | |
1212 this->initialize_thread_local_storage(); | |
1213 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1214 while(!_should_terminate) { | |
1215 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
1216 assert(watcher_thread() == this, "thread consistency check"); | |
1217 | |
1218 // Calculate how long it'll be until the next PeriodicTask work | |
1219 // should be done, and sleep that amount of time. | |
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1220 size_t time_to_wait = PeriodicTask::time_to_wait(); |
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1221 |
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1222 // we expect this to timeout - we only ever get unparked when |
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1223 // we should terminate |
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1224 { |
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1225 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1226 |
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1227 jlong prev_time = os::javaTimeNanos(); |
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1228 for (;;) { |
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1229 int res= _SleepEvent->park(time_to_wait); |
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1230 if (res == OS_TIMEOUT || _should_terminate) |
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1231 break; |
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1232 // spurious wakeup of some kind |
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1233 jlong now = os::javaTimeNanos(); |
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1234 time_to_wait -= (now - prev_time) / 1000000; |
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1235 if (time_to_wait <= 0) |
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1236 break; |
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1237 prev_time = now; |
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1238 } |
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1239 } |
0 | 1240 |
1241 if (is_error_reported()) { | |
1242 // A fatal error has happened, the error handler(VMError::report_and_die) | |
1243 // should abort JVM after creating an error log file. However in some | |
1244 // rare cases, the error handler itself might deadlock. Here we try to | |
1245 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
1246 // | |
1247 // This code is in WatcherThread because WatcherThread wakes up | |
1248 // periodically so the fatal error handler doesn't need to do anything; | |
1249 // also because the WatcherThread is less likely to crash than other | |
1250 // threads. | |
1251 | |
1252 for (;;) { | |
1253 if (!ShowMessageBoxOnError | |
1254 && (OnError == NULL || OnError[0] == '\0') | |
1255 && Arguments::abort_hook() == NULL) { | |
1256 os::sleep(this, 2 * 60 * 1000, false); | |
1257 fdStream err(defaultStream::output_fd()); | |
1258 err.print_raw_cr("# [ timer expired, abort... ]"); | |
1259 // skip atexit/vm_exit/vm_abort hooks | |
1260 os::die(); | |
1261 } | |
1262 | |
1263 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
1264 // ShowMessageBoxOnError when it is ready to abort. | |
1265 os::sleep(this, 5 * 1000, false); | |
1266 } | |
1267 } | |
1268 | |
1269 PeriodicTask::real_time_tick(time_to_wait); | |
1270 | |
1271 // If we have no more tasks left due to dynamic disenrollment, | |
1272 // shut down the thread since we don't currently support dynamic enrollment | |
1273 if (PeriodicTask::num_tasks() == 0) { | |
1274 _should_terminate = true; | |
1275 } | |
1276 } | |
1277 | |
1278 // Signal that it is terminated | |
1279 { | |
1280 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
1281 _watcher_thread = NULL; | |
1282 Terminator_lock->notify(); | |
1283 } | |
1284 | |
1285 // Thread destructor usually does this.. | |
1286 ThreadLocalStorage::set_thread(NULL); | |
1287 } | |
1288 | |
1289 void WatcherThread::start() { | |
1290 if (watcher_thread() == NULL) { | |
1291 _should_terminate = false; | |
1292 // Create the single instance of WatcherThread | |
1293 new WatcherThread(); | |
1294 } | |
1295 } | |
1296 | |
1297 void WatcherThread::stop() { | |
1298 // it is ok to take late safepoints here, if needed | |
1299 MutexLocker mu(Terminator_lock); | |
1300 _should_terminate = true; | |
1681
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1301 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1302 |
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1303 Thread* watcher = watcher_thread(); |
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1304 if (watcher != NULL) |
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1305 watcher->_SleepEvent->unpark(); |
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1306 |
0 | 1307 while(watcher_thread() != NULL) { |
1308 // This wait should make safepoint checks, wait without a timeout, | |
1309 // and wait as a suspend-equivalent condition. | |
1310 // | |
1311 // Note: If the FlatProfiler is running, then this thread is waiting | |
1312 // for the WatcherThread to terminate and the WatcherThread, via the | |
1313 // FlatProfiler task, is waiting for the external suspend request on | |
1314 // this thread to complete. wait_for_ext_suspend_completion() will | |
1315 // eventually timeout, but that takes time. Making this wait a | |
1316 // suspend-equivalent condition solves that timeout problem. | |
1317 // | |
1318 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
1319 Mutex::_as_suspend_equivalent_flag); | |
1320 } | |
1321 } | |
1322 | |
1323 void WatcherThread::print_on(outputStream* st) const { | |
1324 st->print("\"%s\" ", name()); | |
1325 Thread::print_on(st); | |
1326 st->cr(); | |
1327 } | |
1328 | |
1329 // ======= JavaThread ======== | |
1330 | |
1331 // A JavaThread is a normal Java thread | |
1332 | |
1333 void JavaThread::initialize() { | |
1334 // Initialize fields | |
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1335 |
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1336 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1337 set_claimed_par_id(-1); |
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1338 |
0 | 1339 set_saved_exception_pc(NULL); |
1340 set_threadObj(NULL); | |
1341 _anchor.clear(); | |
1342 set_entry_point(NULL); | |
1343 set_jni_functions(jni_functions()); | |
1344 set_callee_target(NULL); | |
1345 set_vm_result(NULL); | |
1346 set_vm_result_2(NULL); | |
1347 set_vframe_array_head(NULL); | |
1348 set_vframe_array_last(NULL); | |
1349 set_deferred_locals(NULL); | |
1350 set_deopt_mark(NULL); | |
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1351 set_deopt_nmethod(NULL); |
0 | 1352 clear_must_deopt_id(); |
1353 set_monitor_chunks(NULL); | |
1354 set_next(NULL); | |
1355 set_thread_state(_thread_new); | |
6197 | 1356 set_recorder(NULL); |
0 | 1357 _terminated = _not_terminated; |
1358 _privileged_stack_top = NULL; | |
1359 _array_for_gc = NULL; | |
1360 _suspend_equivalent = false; | |
1361 _in_deopt_handler = 0; | |
1362 _doing_unsafe_access = false; | |
1363 _stack_guard_state = stack_guard_unused; | |
1364 _exception_oop = NULL; | |
1365 _exception_pc = 0; | |
1366 _exception_handler_pc = 0; | |
1903 | 1367 _is_method_handle_return = 0; |
0 | 1368 _jvmti_thread_state= NULL; |
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1369 _should_post_on_exceptions_flag = JNI_FALSE; |
0 | 1370 _jvmti_get_loaded_classes_closure = NULL; |
1371 _interp_only_mode = 0; | |
1372 _special_runtime_exit_condition = _no_async_condition; | |
1373 _pending_async_exception = NULL; | |
1374 _is_compiling = false; | |
1375 _thread_stat = NULL; | |
1376 _thread_stat = new ThreadStatistics(); | |
1377 _blocked_on_compilation = false; | |
1378 _jni_active_critical = 0; | |
1379 _do_not_unlock_if_synchronized = false; | |
1380 _cached_monitor_info = NULL; | |
1381 _parker = Parker::Allocate(this) ; | |
1382 | |
1383 #ifndef PRODUCT | |
1384 _jmp_ring_index = 0; | |
1385 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
1386 record_jump(NULL, NULL, NULL, 0); | |
1387 } | |
1388 #endif /* PRODUCT */ | |
1389 | |
1390 set_thread_profiler(NULL); | |
1391 if (FlatProfiler::is_active()) { | |
1392 // This is where we would decide to either give each thread it's own profiler | |
1393 // or use one global one from FlatProfiler, | |
1394 // or up to some count of the number of profiled threads, etc. | |
1395 ThreadProfiler* pp = new ThreadProfiler(); | |
1396 pp->engage(); | |
1397 set_thread_profiler(pp); | |
1398 } | |
1399 | |
1400 // Setup safepoint state info for this thread | |
1401 ThreadSafepointState::create(this); | |
1402 | |
1403 debug_only(_java_call_counter = 0); | |
1404 | |
1405 // JVMTI PopFrame support | |
1406 _popframe_condition = popframe_inactive; | |
1407 _popframe_preserved_args = NULL; | |
1408 _popframe_preserved_args_size = 0; | |
1409 | |
1410 pd_initialize(); | |
1411 } | |
1412 | |
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1413 #ifndef SERIALGC |
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1414 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1415 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1416 #endif // !SERIALGC |
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1417 |
4006 | 1418 JavaThread::JavaThread(bool is_attaching_via_jni) : |
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1419 Thread() |
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1420 #ifndef SERIALGC |
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1421 , _satb_mark_queue(&_satb_mark_queue_set), |
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1422 _dirty_card_queue(&_dirty_card_queue_set) |
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1423 #endif // !SERIALGC |
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1424 { |
0 | 1425 initialize(); |
4006 | 1426 if (is_attaching_via_jni) { |
1427 _jni_attach_state = _attaching_via_jni; | |
1428 } else { | |
1429 _jni_attach_state = _not_attaching_via_jni; | |
1430 } | |
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1431 assert(_deferred_card_mark.is_empty(), "Default MemRegion ctor"); |
6197 | 1432 _safepoint_visible = false; |
0 | 1433 } |
1434 | |
1435 bool JavaThread::reguard_stack(address cur_sp) { | |
1436 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
1437 return true; // Stack already guarded or guard pages not needed. | |
1438 } | |
1439 | |
1440 if (register_stack_overflow()) { | |
1441 // For those architectures which have separate register and | |
1442 // memory stacks, we must check the register stack to see if | |
1443 // it has overflowed. | |
1444 return false; | |
1445 } | |
1446 | |
1447 // Java code never executes within the yellow zone: the latter is only | |
1448 // there to provoke an exception during stack banging. If java code | |
1449 // is executing there, either StackShadowPages should be larger, or | |
1450 // some exception code in c1, c2 or the interpreter isn't unwinding | |
1451 // when it should. | |
1452 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
1453 | |
1454 enable_stack_yellow_zone(); | |
1455 return true; | |
1456 } | |
1457 | |
1458 bool JavaThread::reguard_stack(void) { | |
1459 return reguard_stack(os::current_stack_pointer()); | |
1460 } | |
1461 | |
1462 | |
1463 void JavaThread::block_if_vm_exited() { | |
1464 if (_terminated == _vm_exited) { | |
1465 // _vm_exited is set at safepoint, and Threads_lock is never released | |
1466 // we will block here forever | |
1467 Threads_lock->lock_without_safepoint_check(); | |
1468 ShouldNotReachHere(); | |
1469 } | |
1470 } | |
1471 | |
1472 | |
1473 // Remove this ifdef when C1 is ported to the compiler interface. | |
1474 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
1475 | |
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1476 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1477 Thread() |
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1478 #ifndef SERIALGC |
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1479 , _satb_mark_queue(&_satb_mark_queue_set), |
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1480 _dirty_card_queue(&_dirty_card_queue_set) |
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1481 #endif // !SERIALGC |
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1482 { |
0 | 1483 if (TraceThreadEvents) { |
1484 tty->print_cr("creating thread %p", this); | |
1485 } | |
1486 initialize(); | |
4006 | 1487 _jni_attach_state = _not_attaching_via_jni; |
0 | 1488 set_entry_point(entry_point); |
1489 // Create the native thread itself. | |
1490 // %note runtime_23 | |
1491 os::ThreadType thr_type = os::java_thread; | |
1492 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
1493 os::java_thread; | |
1494 os::create_thread(this, thr_type, stack_sz); | |
6197 | 1495 _safepoint_visible = false; |
0 | 1496 // The _osthread may be NULL here because we ran out of memory (too many threads active). |
1497 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
1498 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
1499 // the exception consists of creating the exception object & initializing it, initialization | |
1500 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
1501 // | |
1502 // The thread is still suspended when we reach here. Thread must be explicit started | |
1503 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
1504 // by calling Threads:add. The reason why this is not done here, is because the thread | |
1505 // object must be fully initialized (take a look at JVM_Start) | |
1506 } | |
1507 | |
1508 JavaThread::~JavaThread() { | |
1509 if (TraceThreadEvents) { | |
1510 tty->print_cr("terminate thread %p", this); | |
1511 } | |
1512 | |
6197 | 1513 // Info NMT that this JavaThread is exiting, its memory |
1514 // recorder should be collected | |
1515 assert(!is_safepoint_visible(), "wrong state"); | |
1516 MemTracker::thread_exiting(this); | |
1517 | |
0 | 1518 // JSR166 -- return the parker to the free list |
1519 Parker::Release(_parker); | |
1520 _parker = NULL ; | |
1521 | |
1522 // Free any remaining previous UnrollBlock | |
1523 vframeArray* old_array = vframe_array_last(); | |
1524 | |
1525 if (old_array != NULL) { | |
1526 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
1527 old_array->set_unroll_block(NULL); | |
1528 delete old_info; | |
1529 delete old_array; | |
1530 } | |
1531 | |
1532 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
1533 if (deferred != NULL) { | |
1534 // This can only happen if thread is destroyed before deoptimization occurs. | |
1535 assert(deferred->length() != 0, "empty array!"); | |
1536 do { | |
1537 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
1538 deferred->remove_at(0); | |
1539 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
1540 delete dlv; | |
1541 } while (deferred->length() != 0); | |
1542 delete deferred; | |
1543 } | |
1544 | |
1545 // All Java related clean up happens in exit | |
1546 ThreadSafepointState::destroy(this); | |
1547 if (_thread_profiler != NULL) delete _thread_profiler; | |
1548 if (_thread_stat != NULL) delete _thread_stat; | |
1549 } | |
1550 | |
1551 | |
1552 // The first routine called by a new Java thread | |
1553 void JavaThread::run() { | |
1554 // initialize thread-local alloc buffer related fields | |
1555 this->initialize_tlab(); | |
1556 | |
1557 // used to test validitity of stack trace backs | |
1558 this->record_base_of_stack_pointer(); | |
1559 | |
1560 // Record real stack base and size. | |
1561 this->record_stack_base_and_size(); | |
1562 | |
1563 // Initialize thread local storage; set before calling MutexLocker | |
1564 this->initialize_thread_local_storage(); | |
1565 | |
1566 this->create_stack_guard_pages(); | |
1567 | |
1681
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1568 this->cache_global_variables(); |
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1569 |
0 | 1570 // Thread is now sufficient initialized to be handled by the safepoint code as being |
1571 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
1572 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
1573 | |
1574 assert(JavaThread::current() == this, "sanity check"); | |
1575 assert(!Thread::current()->owns_locks(), "sanity check"); | |
1576 | |
1577 DTRACE_THREAD_PROBE(start, this); | |
1578 | |
1579 // This operation might block. We call that after all safepoint checks for a new thread has | |
1580 // been completed. | |
1581 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1582 | |
1583 if (JvmtiExport::should_post_thread_life()) { | |
1584 JvmtiExport::post_thread_start(this); | |
1585 } | |
1586 | |
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1587 EVENT_BEGIN(TraceEventThreadStart, event); |
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1588 EVENT_COMMIT(event, |
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1589 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1590 |
0 | 1591 // We call another function to do the rest so we are sure that the stack addresses used |
1592 // from there will be lower than the stack base just computed | |
1593 thread_main_inner(); | |
1594 | |
1595 // Note, thread is no longer valid at this point! | |
1596 } | |
1597 | |
1598 | |
1599 void JavaThread::thread_main_inner() { | |
1600 assert(JavaThread::current() == this, "sanity check"); | |
1601 assert(this->threadObj() != NULL, "just checking"); | |
1602 | |
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1603 // Execute thread entry point unless this thread has a pending exception |
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1604 // or has been stopped before starting. |
0 | 1605 // Note: Due to JVM_StopThread we can have pending exceptions already! |
2162
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1606 if (!this->has_pending_exception() && |
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1607 !java_lang_Thread::is_stillborn(this->threadObj())) { |
4006 | 1608 { |
1609 ResourceMark rm(this); | |
1610 this->set_native_thread_name(this->get_thread_name()); | |
1611 } | |
0 | 1612 HandleMark hm(this); |
1613 this->entry_point()(this, this); | |
1614 } | |
1615 | |
1616 DTRACE_THREAD_PROBE(stop, this); | |
1617 | |
1618 this->exit(false); | |
1619 delete this; | |
1620 } | |
1621 | |
1622 | |
1623 static void ensure_join(JavaThread* thread) { | |
1624 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
1625 Handle threadObj(thread, thread->threadObj()); | |
1626 assert(threadObj.not_null(), "java thread object must exist"); | |
1627 ObjectLocker lock(threadObj, thread); | |
1628 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1629 thread->clear_pending_exception(); | |
1630 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
1631 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
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1632 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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1633 // to complete once we've done the notify_all below |
0 | 1634 java_lang_Thread::set_thread(threadObj(), NULL); |
1635 lock.notify_all(thread); | |
1636 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1637 thread->clear_pending_exception(); | |
1638 } | |
1639 | |
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1640 |
0 | 1641 // For any new cleanup additions, please check to see if they need to be applied to |
1642 // cleanup_failed_attach_current_thread as well. | |
1643 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
1644 assert(this == JavaThread::current(), "thread consistency check"); | |
1645 if (!InitializeJavaLangSystem) return; | |
1646 | |
1647 HandleMark hm(this); | |
1648 Handle uncaught_exception(this, this->pending_exception()); | |
1649 this->clear_pending_exception(); | |
1650 Handle threadObj(this, this->threadObj()); | |
1651 assert(threadObj.not_null(), "Java thread object should be created"); | |
1652 | |
1653 if (get_thread_profiler() != NULL) { | |
1654 get_thread_profiler()->disengage(); | |
1655 ResourceMark rm; | |
1656 get_thread_profiler()->print(get_thread_name()); | |
1657 } | |
1658 | |
1659 | |
1660 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
1661 { | |
1662 EXCEPTION_MARK; | |
1663 | |
1664 CLEAR_PENDING_EXCEPTION; | |
1665 } | |
1666 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
1667 // has to be fixed by a runtime query method | |
1668 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
1669 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
1670 // java.lang.Thread.dispatchUncaughtException | |
1671 if (uncaught_exception.not_null()) { | |
1672 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
1673 { | |
1674 EXCEPTION_MARK; | |
1675 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
1676 // call it. Otherwise we have an older library without the JSR-166 changes, | |
1677 // so call ThreadGroup.uncaughtException() | |
1678 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
1679 CallInfo callinfo; | |
1142 | 1680 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1681 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
2177
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1682 vmSymbols::dispatchUncaughtException_name(), |
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1683 vmSymbols::throwable_void_signature(), |
0 | 1684 KlassHandle(), false, false, THREAD); |
1685 CLEAR_PENDING_EXCEPTION; | |
1686 methodHandle method = callinfo.selected_method(); | |
1687 if (method.not_null()) { | |
1688 JavaValue result(T_VOID); | |
1689 JavaCalls::call_virtual(&result, | |
1690 threadObj, thread_klass, | |
2177
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1691 vmSymbols::dispatchUncaughtException_name(), |
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1692 vmSymbols::throwable_void_signature(), |
0 | 1693 uncaught_exception, |
1694 THREAD); | |
1695 } else { | |
1142 | 1696 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
0 | 1697 JavaValue result(T_VOID); |
1698 JavaCalls::call_virtual(&result, | |
1699 group, thread_group, | |
2177
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1700 vmSymbols::uncaughtException_name(), |
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1701 vmSymbols::thread_throwable_void_signature(), |
0 | 1702 threadObj, // Arg 1 |
1703 uncaught_exception, // Arg 2 | |
1704 THREAD); | |
1705 } | |
2200
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1706 if (HAS_PENDING_EXCEPTION) { |
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1707 ResourceMark rm(this); |
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1708 jio_fprintf(defaultStream::error_stream(), |
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1709 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1710 " in thread \"%s\"\n", |
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1711 Klass::cast(pending_exception()->klass())->external_name(), |
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1712 get_thread_name()); |
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1713 CLEAR_PENDING_EXCEPTION; |
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1714 } |
0 | 1715 } |
1716 } | |
1717 | |
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1718 // Called before the java thread exit since we want to read info |
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1719 // from java_lang_Thread object |
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1720 EVENT_BEGIN(TraceEventThreadEnd, event); |
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1721 EVENT_COMMIT(event, |
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1722 EVENT_SET(event, javalangthread, java_lang_Thread::thread_id(this->threadObj()))); |
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1723 |
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1724 // Call after last event on thread |
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1725 EVENT_THREAD_EXIT(this); |
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1726 |
0 | 1727 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during |
1728 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
1729 // is deprecated anyhow. | |
1730 { int count = 3; | |
1731 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
1732 EXCEPTION_MARK; | |
1733 JavaValue result(T_VOID); | |
1142 | 1734 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1735 JavaCalls::call_virtual(&result, |
1736 threadObj, thread_klass, | |
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1737 vmSymbols::exit_method_name(), |
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1738 vmSymbols::void_method_signature(), |
0 | 1739 THREAD); |
1740 CLEAR_PENDING_EXCEPTION; | |
1741 } | |
1742 } | |
1743 | |
1744 // notify JVMTI | |
1745 if (JvmtiExport::should_post_thread_life()) { | |
1746 JvmtiExport::post_thread_end(this); | |
1747 } | |
1748 | |
1749 // We have notified the agents that we are exiting, before we go on, | |
1750 // we must check for a pending external suspend request and honor it | |
1751 // in order to not surprise the thread that made the suspend request. | |
1752 while (true) { | |
1753 { | |
1754 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1755 if (!is_external_suspend()) { | |
1756 set_terminated(_thread_exiting); | |
1757 ThreadService::current_thread_exiting(this); | |
1758 break; | |
1759 } | |
1760 // Implied else: | |
1761 // Things get a little tricky here. We have a pending external | |
1762 // suspend request, but we are holding the SR_lock so we | |
1763 // can't just self-suspend. So we temporarily drop the lock | |
1764 // and then self-suspend. | |
1765 } | |
1766 | |
1767 ThreadBlockInVM tbivm(this); | |
1768 java_suspend_self(); | |
1769 | |
1770 // We're done with this suspend request, but we have to loop around | |
1771 // and check again. Eventually we will get SR_lock without a pending | |
1772 // external suspend request and will be able to mark ourselves as | |
1773 // exiting. | |
1774 } | |
1775 // no more external suspends are allowed at this point | |
1776 } else { | |
1777 // before_exit() has already posted JVMTI THREAD_END events | |
1778 } | |
1779 | |
1780 // Notify waiters on thread object. This has to be done after exit() is called | |
1781 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
1782 // group should have the destroyed bit set before waiters are notified). | |
1783 ensure_join(this); | |
1784 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
1785 | |
1786 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
1787 // held by this thread must be released. A detach operation must only | |
1788 // get here if there are no Java frames on the stack. Therefore, any | |
1789 // owned monitors at this point MUST be JNI-acquired monitors which are | |
1790 // pre-inflated and in the monitor cache. | |
1791 // | |
1792 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
1793 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
1794 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
1795 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
1796 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
1797 } | |
1798 | |
1799 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
1800 // is in a consistent state, in case GC happens | |
1801 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
1802 | |
1803 if (active_handles() != NULL) { | |
1804 JNIHandleBlock* block = active_handles(); | |
1805 set_active_handles(NULL); | |
1806 JNIHandleBlock::release_block(block); | |
1807 } | |
1808 | |
1809 if (free_handle_block() != NULL) { | |
1810 JNIHandleBlock* block = free_handle_block(); | |
1811 set_free_handle_block(NULL); | |
1812 JNIHandleBlock::release_block(block); | |
1813 } | |
1814 | |
1815 // These have to be removed while this is still a valid thread. | |
1816 remove_stack_guard_pages(); | |
1817 | |
1818 if (UseTLAB) { | |
1819 tlab().make_parsable(true); // retire TLAB | |
1820 } | |
1821 | |
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1822 if (JvmtiEnv::environments_might_exist()) { |
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1823 JvmtiExport::cleanup_thread(this); |
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1824 } |
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1825 |
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1826 #ifndef SERIALGC |
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1827 // We must flush G1-related buffers before removing a thread from |
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1828 // the list of active threads. |
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1829 if (UseG1GC) { |
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1830 flush_barrier_queues(); |
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1831 } |
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1832 #endif |
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1833 |
0 | 1834 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
1835 Threads::remove(this); | |
1836 } | |
1837 | |
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1838 #ifndef SERIALGC |
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1839 // Flush G1-related queues. |
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1840 void JavaThread::flush_barrier_queues() { |
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1841 satb_mark_queue().flush(); |
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1842 dirty_card_queue().flush(); |
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1843 } |
1842
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1844 |
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1845 void JavaThread::initialize_queues() { |
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1846 assert(!SafepointSynchronize::is_at_safepoint(), |
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1847 "we should not be at a safepoint"); |
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1848 |
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1849 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1850 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1851 // The SATB queue should have been constructed with its active |
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1852 // field set to false. |
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1853 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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1854 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1855 // If we are creating the thread during a marking cycle, we should |
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1856 // set the active field of the SATB queue to true. |
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1857 if (satb_queue_set.is_active()) { |
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1858 satb_queue.set_active(true); |
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1859 } |
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1860 |
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1861 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1862 // The dirty card queue should have been constructed with its |
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1863 // active field set to true. |
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1864 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1865 } |
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1866 #endif // !SERIALGC |
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1867 |
0 | 1868 void JavaThread::cleanup_failed_attach_current_thread() { |
441
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1869 if (get_thread_profiler() != NULL) { |
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1870 get_thread_profiler()->disengage(); |
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1871 ResourceMark rm; |
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1872 get_thread_profiler()->print(get_thread_name()); |
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1873 } |
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1874 |
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1875 if (active_handles() != NULL) { |
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1876 JNIHandleBlock* block = active_handles(); |
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1877 set_active_handles(NULL); |
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1878 JNIHandleBlock::release_block(block); |
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1879 } |
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1880 |
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1881 if (free_handle_block() != NULL) { |
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1882 JNIHandleBlock* block = free_handle_block(); |
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1883 set_free_handle_block(NULL); |
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1884 JNIHandleBlock::release_block(block); |
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1885 } |
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1886 |
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1887 // These have to be removed while this is still a valid thread. |
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1888 remove_stack_guard_pages(); |
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1889 |
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1890 if (UseTLAB) { |
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1891 tlab().make_parsable(true); // retire TLAB, if any |
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1892 } |
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1893 |
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1894 #ifndef SERIALGC |
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1895 if (UseG1GC) { |
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1896 flush_barrier_queues(); |
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1897 } |
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1898 #endif |
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1899 |
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1900 Threads::remove(this); |
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1901 delete this; |
0 | 1902 } |
1903 | |
1904 | |
441
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1905 |
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1906 |
0 | 1907 JavaThread* JavaThread::active() { |
1908 Thread* thread = ThreadLocalStorage::thread(); | |
1909 assert(thread != NULL, "just checking"); | |
1910 if (thread->is_Java_thread()) { | |
1911 return (JavaThread*) thread; | |
1912 } else { | |
1913 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
1914 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
1915 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
1916 assert(ret->is_Java_thread(), "must be a Java thread"); | |
1917 return ret; | |
1918 } | |
1919 } | |
1920 | |
1921 bool JavaThread::is_lock_owned(address adr) const { | |
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1922 if (Thread::is_lock_owned(adr)) return true; |
0 | 1923 |
1924 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
1925 if (chunk->contains(adr)) return true; | |
1926 } | |
1927 | |
1928 return false; | |
1929 } | |
1930 | |
1931 | |
1932 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
1933 chunk->set_next(monitor_chunks()); | |
1934 set_monitor_chunks(chunk); | |
1935 } | |
1936 | |
1937 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
1938 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
1939 if (monitor_chunks() == chunk) { | |
1940 set_monitor_chunks(chunk->next()); | |
1941 } else { | |
1942 MonitorChunk* prev = monitor_chunks(); | |
1943 while (prev->next() != chunk) prev = prev->next(); | |
1944 prev->set_next(chunk->next()); | |
1945 } | |
1946 } | |
1947 | |
1948 // JVM support. | |
1949 | |
1950 // Note: this function shouldn't block if it's called in | |
1951 // _thread_in_native_trans state (such as from | |
1952 // check_special_condition_for_native_trans()). | |
1953 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
1954 | |
1955 if (has_last_Java_frame() && has_async_condition()) { | |
1956 // If we are at a polling page safepoint (not a poll return) | |
1957 // then we must defer async exception because live registers | |
1958 // will be clobbered by the exception path. Poll return is | |
1959 // ok because the call we a returning from already collides | |
1960 // with exception handling registers and so there is no issue. | |
1961 // (The exception handling path kills call result registers but | |
1962 // this is ok since the exception kills the result anyway). | |
1963 | |
1964 if (is_at_poll_safepoint()) { | |
1965 // if the code we are returning to has deoptimized we must defer | |
1966 // the exception otherwise live registers get clobbered on the | |
1967 // exception path before deoptimization is able to retrieve them. | |
1968 // | |
1969 RegisterMap map(this, false); | |
1970 frame caller_fr = last_frame().sender(&map); | |
1971 assert(caller_fr.is_compiled_frame(), "what?"); | |
1972 if (caller_fr.is_deoptimized_frame()) { | |
1973 if (TraceExceptions) { | |
1974 ResourceMark rm; | |
1975 tty->print_cr("deferred async exception at compiled safepoint"); | |
1976 } | |
1977 return; | |
1978 } | |
1979 } | |
1980 } | |
1981 | |
1982 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
1983 if (condition == _no_async_condition) { | |
1984 // Conditions have changed since has_special_runtime_exit_condition() | |
1985 // was called: | |
1986 // - if we were here only because of an external suspend request, | |
1987 // then that was taken care of above (or cancelled) so we are done | |
1988 // - if we were here because of another async request, then it has | |
1989 // been cleared between the has_special_runtime_exit_condition() | |
1990 // and now so again we are done | |
1991 return; | |
1992 } | |
1993 | |
1994 // Check for pending async. exception | |
1995 if (_pending_async_exception != NULL) { | |
1996 // Only overwrite an already pending exception, if it is not a threadDeath. | |
1142 | 1997 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 1998 |
1999 // We cannot call Exceptions::_throw(...) here because we cannot block | |
2000 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
2001 | |
2002 if (TraceExceptions) { | |
2003 ResourceMark rm; | |
2004 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
2005 if (has_last_Java_frame() ) { | |
2006 frame f = last_frame(); | |
2007 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
2008 } | |
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2009 tty->print_cr(" of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
0 | 2010 } |
2011 _pending_async_exception = NULL; | |
2012 clear_has_async_exception(); | |
2013 } | |
2014 } | |
2015 | |
2016 if (check_unsafe_error && | |
2017 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
2018 condition = _no_async_condition; // done | |
2019 switch (thread_state()) { | |
2020 case _thread_in_vm: | |
2021 { | |
2022 JavaThread* THREAD = this; | |
2023 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
2024 } | |
2025 case _thread_in_native: | |
2026 { | |
2027 ThreadInVMfromNative tiv(this); | |
2028 JavaThread* THREAD = this; | |
2029 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
2030 } | |
2031 case _thread_in_Java: | |
2032 { | |
2033 ThreadInVMfromJava tiv(this); | |
2034 JavaThread* THREAD = this; | |
2035 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
2036 } | |
2037 default: | |
2038 ShouldNotReachHere(); | |
2039 } | |
2040 } | |
2041 | |
2042 assert(condition == _no_async_condition || has_pending_exception() || | |
2043 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
2044 "must have handled the async condition, if no exception"); | |
2045 } | |
2046 | |
2047 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
2048 // | |
2049 // Check for pending external suspend. Internal suspend requests do | |
2050 // not use handle_special_runtime_exit_condition(). | |
2051 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2052 // thread is not the current thread. In older versions of jdbx, jdbx | |
2053 // threads could call into the VM with another thread's JNIEnv so we | |
2054 // can be here operating on behalf of a suspended thread (4432884). | |
2055 bool do_self_suspend = is_external_suspend_with_lock(); | |
2056 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
2057 // | |
2058 // Because thread is external suspended the safepoint code will count | |
2059 // thread as at a safepoint. This can be odd because we can be here | |
2060 // as _thread_in_Java which would normally transition to _thread_blocked | |
2061 // at a safepoint. We would like to mark the thread as _thread_blocked | |
2062 // before calling java_suspend_self like all other callers of it but | |
2063 // we must then observe proper safepoint protocol. (We can't leave | |
2064 // _thread_blocked with a safepoint in progress). However we can be | |
2065 // here as _thread_in_native_trans so we can't use a normal transition | |
2066 // constructor/destructor pair because they assert on that type of | |
2067 // transition. We could do something like: | |
2068 // | |
2069 // JavaThreadState state = thread_state(); | |
2070 // set_thread_state(_thread_in_vm); | |
2071 // { | |
2072 // ThreadBlockInVM tbivm(this); | |
2073 // java_suspend_self() | |
2074 // } | |
2075 // set_thread_state(_thread_in_vm_trans); | |
2076 // if (safepoint) block; | |
2077 // set_thread_state(state); | |
2078 // | |
2079 // but that is pretty messy. Instead we just go with the way the | |
2080 // code has worked before and note that this is the only path to | |
2081 // java_suspend_self that doesn't put the thread in _thread_blocked | |
2082 // mode. | |
2083 | |
2084 frame_anchor()->make_walkable(this); | |
2085 java_suspend_self(); | |
2086 | |
2087 // We might be here for reasons in addition to the self-suspend request | |
2088 // so check for other async requests. | |
2089 } | |
2090 | |
2091 if (check_asyncs) { | |
2092 check_and_handle_async_exceptions(); | |
2093 } | |
2094 } | |
2095 | |
2096 void JavaThread::send_thread_stop(oop java_throwable) { | |
2097 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
2098 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
2099 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
2100 | |
2101 // Do not throw asynchronous exceptions against the compiler thread | |
2102 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
2103 if (is_Compiler_thread()) return; | |
2104 | |
2105 { | |
2106 // Actually throw the Throwable against the target Thread - however | |
2107 // only if there is no thread death exception installed already. | |
1142 | 2108 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 2109 // If the topmost frame is a runtime stub, then we are calling into |
2110 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
2111 // must deoptimize the caller before continuing, as the compiled exception handler table | |
2112 // may not be valid | |
2113 if (has_last_Java_frame()) { | |
2114 frame f = last_frame(); | |
2115 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
2116 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2117 RegisterMap reg_map(this, UseBiasedLocking); | |
2118 frame compiled_frame = f.sender(®_map); | |
2119 if (compiled_frame.can_be_deoptimized()) { | |
2120 Deoptimization::deoptimize(this, compiled_frame, ®_map); | |
2121 } | |
2122 } | |
2123 } | |
2124 | |
2125 // Set async. pending exception in thread. | |
2126 set_pending_async_exception(java_throwable); | |
2127 | |
2128 if (TraceExceptions) { | |
2129 ResourceMark rm; | |
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2130 tty->print_cr("Pending Async. exception installed of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
0 | 2131 } |
2132 // for AbortVMOnException flag | |
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2133 NOT_PRODUCT(Exceptions::debug_check_abort(InstanceKlass::cast(_pending_async_exception->klass())->external_name())); |
0 | 2134 } |
2135 } | |
2136 | |
2137 | |
2138 // Interrupt thread so it will wake up from a potential wait() | |
2139 Thread::interrupt(this); | |
2140 } | |
2141 | |
2142 // External suspension mechanism. | |
2143 // | |
2144 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
2145 // to any VM_locks and it is at a transition | |
2146 // Self-suspension will happen on the transition out of the vm. | |
2147 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
2148 // | |
2149 // Guarantees on return: | |
2150 // + Target thread will not execute any new bytecode (that's why we need to | |
2151 // force a safepoint) | |
2152 // + Target thread will not enter any new monitors | |
2153 // | |
2154 void JavaThread::java_suspend() { | |
2155 { MutexLocker mu(Threads_lock); | |
2156 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
2157 return; | |
2158 } | |
2159 } | |
2160 | |
2161 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2162 if (!is_external_suspend()) { | |
2163 // a racing resume has cancelled us; bail out now | |
2164 return; | |
2165 } | |
2166 | |
2167 // suspend is done | |
2168 uint32_t debug_bits = 0; | |
2169 // Warning: is_ext_suspend_completed() may temporarily drop the | |
2170 // SR_lock to allow the thread to reach a stable thread state if | |
2171 // it is currently in a transient thread state. | |
2172 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
2173 SuspendRetryDelay, &debug_bits) ) { | |
2174 return; | |
2175 } | |
2176 } | |
2177 | |
2178 VM_ForceSafepoint vm_suspend; | |
2179 VMThread::execute(&vm_suspend); | |
2180 } | |
2181 | |
2182 // Part II of external suspension. | |
2183 // A JavaThread self suspends when it detects a pending external suspend | |
2184 // request. This is usually on transitions. It is also done in places | |
2185 // where continuing to the next transition would surprise the caller, | |
2186 // e.g., monitor entry. | |
2187 // | |
2188 // Returns the number of times that the thread self-suspended. | |
2189 // | |
2190 // Note: DO NOT call java_suspend_self() when you just want to block current | |
2191 // thread. java_suspend_self() is the second stage of cooperative | |
2192 // suspension for external suspend requests and should only be used | |
2193 // to complete an external suspend request. | |
2194 // | |
2195 int JavaThread::java_suspend_self() { | |
2196 int ret = 0; | |
2197 | |
2198 // we are in the process of exiting so don't suspend | |
2199 if (is_exiting()) { | |
2200 clear_external_suspend(); | |
2201 return ret; | |
2202 } | |
2203 | |
2204 assert(_anchor.walkable() || | |
2205 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
2206 "must have walkable stack"); | |
2207 | |
2208 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2209 | |
979 | 2210 assert(!this->is_ext_suspended(), |
0 | 2211 "a thread trying to self-suspend should not already be suspended"); |
2212 | |
2213 if (this->is_suspend_equivalent()) { | |
2214 // If we are self-suspending as a result of the lifting of a | |
2215 // suspend equivalent condition, then the suspend_equivalent | |
2216 // flag is not cleared until we set the ext_suspended flag so | |
2217 // that wait_for_ext_suspend_completion() returns consistent | |
2218 // results. | |
2219 this->clear_suspend_equivalent(); | |
2220 } | |
2221 | |
2222 // A racing resume may have cancelled us before we grabbed SR_lock | |
2223 // above. Or another external suspend request could be waiting for us | |
2224 // by the time we return from SR_lock()->wait(). The thread | |
2225 // that requested the suspension may already be trying to walk our | |
2226 // stack and if we return now, we can change the stack out from under | |
2227 // it. This would be a "bad thing (TM)" and cause the stack walker | |
2228 // to crash. We stay self-suspended until there are no more pending | |
2229 // external suspend requests. | |
2230 while (is_external_suspend()) { | |
2231 ret++; | |
2232 this->set_ext_suspended(); | |
2233 | |
2234 // _ext_suspended flag is cleared by java_resume() | |
2235 while (is_ext_suspended()) { | |
2236 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
2237 } | |
2238 } | |
2239 | |
2240 return ret; | |
2241 } | |
2242 | |
2243 #ifdef ASSERT | |
2244 // verify the JavaThread has not yet been published in the Threads::list, and | |
2245 // hence doesn't need protection from concurrent access at this stage | |
2246 void JavaThread::verify_not_published() { | |
2247 if (!Threads_lock->owned_by_self()) { | |
2248 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
2249 assert( !Threads::includes(this), | |
2250 "java thread shouldn't have been published yet!"); | |
2251 } | |
2252 else { | |
2253 assert( !Threads::includes(this), | |
2254 "java thread shouldn't have been published yet!"); | |
2255 } | |
2256 } | |
2257 #endif | |
2258 | |
2259 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2260 // progress or when _suspend_flags is non-zero. | |
2261 // Current thread needs to self-suspend if there is a suspend request and/or | |
2262 // block if a safepoint is in progress. | |
2263 // Async exception ISN'T checked. | |
2264 // Note only the ThreadInVMfromNative transition can call this function | |
2265 // directly and when thread state is _thread_in_native_trans | |
2266 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
2267 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
2268 | |
2269 JavaThread *curJT = JavaThread::current(); | |
2270 bool do_self_suspend = thread->is_external_suspend(); | |
2271 | |
2272 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
2273 | |
2274 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2275 // thread is not the current thread. In older versions of jdbx, jdbx | |
2276 // threads could call into the VM with another thread's JNIEnv so we | |
2277 // can be here operating on behalf of a suspended thread (4432884). | |
2278 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
2279 JavaThreadState state = thread->thread_state(); | |
2280 | |
2281 // We mark this thread_blocked state as a suspend-equivalent so | |
2282 // that a caller to is_ext_suspend_completed() won't be confused. | |
2283 // The suspend-equivalent state is cleared by java_suspend_self(). | |
2284 thread->set_suspend_equivalent(); | |
2285 | |
2286 // If the safepoint code sees the _thread_in_native_trans state, it will | |
2287 // wait until the thread changes to other thread state. There is no | |
2288 // guarantee on how soon we can obtain the SR_lock and complete the | |
2289 // self-suspend request. It would be a bad idea to let safepoint wait for | |
2290 // too long. Temporarily change the state to _thread_blocked to | |
2291 // let the VM thread know that this thread is ready for GC. The problem | |
2292 // of changing thread state is that safepoint could happen just after | |
2293 // java_suspend_self() returns after being resumed, and VM thread will | |
2294 // see the _thread_blocked state. We must check for safepoint | |
2295 // after restoring the state and make sure we won't leave while a safepoint | |
2296 // is in progress. | |
2297 thread->set_thread_state(_thread_blocked); | |
2298 thread->java_suspend_self(); | |
2299 thread->set_thread_state(state); | |
2300 // Make sure new state is seen by VM thread | |
2301 if (os::is_MP()) { | |
2302 if (UseMembar) { | |
2303 // Force a fence between the write above and read below | |
2304 OrderAccess::fence(); | |
2305 } else { | |
2306 // Must use this rather than serialization page in particular on Windows | |
2307 InterfaceSupport::serialize_memory(thread); | |
2308 } | |
2309 } | |
2310 } | |
2311 | |
2312 if (SafepointSynchronize::do_call_back()) { | |
2313 // If we are safepointing, then block the caller which may not be | |
2314 // the same as the target thread (see above). | |
2315 SafepointSynchronize::block(curJT); | |
2316 } | |
2317 | |
2318 if (thread->is_deopt_suspend()) { | |
2319 thread->clear_deopt_suspend(); | |
2320 RegisterMap map(thread, false); | |
2321 frame f = thread->last_frame(); | |
2322 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
2323 f = f.sender(&map); | |
2324 } | |
2325 if (f.id() == thread->must_deopt_id()) { | |
2326 thread->clear_must_deopt_id(); | |
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2327 f.deoptimize(thread); |
0 | 2328 } else { |
2329 fatal("missed deoptimization!"); | |
2330 } | |
2331 } | |
2332 } | |
2333 | |
2334 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2335 // progress or when _suspend_flags is non-zero. | |
2336 // Current thread needs to self-suspend if there is a suspend request and/or | |
2337 // block if a safepoint is in progress. | |
2338 // Also check for pending async exception (not including unsafe access error). | |
2339 // Note only the native==>VM/Java barriers can call this function and when | |
2340 // thread state is _thread_in_native_trans. | |
2341 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
2342 check_safepoint_and_suspend_for_native_trans(thread); | |
2343 | |
2344 if (thread->has_async_exception()) { | |
2345 // We are in _thread_in_native_trans state, don't handle unsafe | |
2346 // access error since that may block. | |
2347 thread->check_and_handle_async_exceptions(false); | |
2348 } | |
2349 } | |
2350 | |
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2351 // This is a variant of the normal |
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2352 // check_special_condition_for_native_trans with slightly different |
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2353 // semantics for use by critical native wrappers. It does all the |
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2354 // normal checks but also performs the transition back into |
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2355 // thread_in_Java state. This is required so that critical natives |
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2356 // can potentially block and perform a GC if they are the last thread |
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2357 // exiting the GC_locker. |
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2358 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) { |
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2359 check_special_condition_for_native_trans(thread); |
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2360 |
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2361 // Finish the transition |
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2362 thread->set_thread_state(_thread_in_Java); |
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2363 |
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2364 if (thread->do_critical_native_unlock()) { |
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2365 ThreadInVMfromJavaNoAsyncException tiv(thread); |
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2366 GC_locker::unlock_critical(thread); |
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2367 thread->clear_critical_native_unlock(); |
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2368 } |
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2369 } |
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2370 |
0 | 2371 // We need to guarantee the Threads_lock here, since resumes are not |
2372 // allowed during safepoint synchronization | |
2373 // Can only resume from an external suspension | |
2374 void JavaThread::java_resume() { | |
2375 assert_locked_or_safepoint(Threads_lock); | |
2376 | |
2377 // Sanity check: thread is gone, has started exiting or the thread | |
2378 // was not externally suspended. | |
2379 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
2380 return; | |
2381 } | |
2382 | |
2383 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2384 | |
2385 clear_external_suspend(); | |
2386 | |
2387 if (is_ext_suspended()) { | |
2388 clear_ext_suspended(); | |
2389 SR_lock()->notify_all(); | |
2390 } | |
2391 } | |
2392 | |
2393 void JavaThread::create_stack_guard_pages() { | |
2394 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
2395 address low_addr = stack_base() - stack_size(); | |
2396 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2397 | |
2398 int allocate = os::allocate_stack_guard_pages(); | |
2399 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
2400 | |
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2401 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
0 | 2402 warning("Attempt to allocate stack guard pages failed."); |
2403 return; | |
2404 } | |
2405 | |
2406 if (os::guard_memory((char *) low_addr, len)) { | |
2407 _stack_guard_state = stack_guard_enabled; | |
2408 } else { | |
2409 warning("Attempt to protect stack guard pages failed."); | |
2410 if (os::uncommit_memory((char *) low_addr, len)) { | |
2411 warning("Attempt to deallocate stack guard pages failed."); | |
2412 } | |
2413 } | |
2414 } | |
2415 | |
2416 void JavaThread::remove_stack_guard_pages() { | |
2417 if (_stack_guard_state == stack_guard_unused) return; | |
2418 address low_addr = stack_base() - stack_size(); | |
2419 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2420 | |
2421 if (os::allocate_stack_guard_pages()) { | |
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2422 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
0 | 2423 _stack_guard_state = stack_guard_unused; |
2424 } else { | |
2425 warning("Attempt to deallocate stack guard pages failed."); | |
2426 } | |
2427 } else { | |
2428 if (_stack_guard_state == stack_guard_unused) return; | |
2429 if (os::unguard_memory((char *) low_addr, len)) { | |
2430 _stack_guard_state = stack_guard_unused; | |
2431 } else { | |
2432 warning("Attempt to unprotect stack guard pages failed."); | |
2433 } | |
2434 } | |
2435 } | |
2436 | |
2437 void JavaThread::enable_stack_yellow_zone() { | |
2438 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2439 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
2440 | |
2441 // The base notation is from the stacks point of view, growing downward. | |
2442 // We need to adjust it to work correctly with guard_memory() | |
2443 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2444 | |
2445 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
2446 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
2447 | |
2448 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
2449 _stack_guard_state = stack_guard_enabled; | |
2450 } else { | |
2451 warning("Attempt to guard stack yellow zone failed."); | |
2452 } | |
2453 enable_register_stack_guard(); | |
2454 } | |
2455 | |
2456 void JavaThread::disable_stack_yellow_zone() { | |
2457 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2458 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
2459 | |
2460 // Simply return if called for a thread that does not use guard pages. | |
2461 if (_stack_guard_state == stack_guard_unused) return; | |
2462 | |
2463 // The base notation is from the stacks point of view, growing downward. | |
2464 // We need to adjust it to work correctly with guard_memory() | |
2465 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2466 | |
2467 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
2468 _stack_guard_state = stack_guard_yellow_disabled; | |
2469 } else { | |
2470 warning("Attempt to unguard stack yellow zone failed."); | |
2471 } | |
2472 disable_register_stack_guard(); | |
2473 } | |
2474 | |
2475 void JavaThread::enable_stack_red_zone() { | |
2476 // The base notation is from the stacks point of view, growing downward. | |
2477 // We need to adjust it to work correctly with guard_memory() | |
2478 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2479 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2480 | |
2481 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
2482 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
2483 | |
2484 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
2485 warning("Attempt to guard stack red zone failed."); | |
2486 } | |
2487 } | |
2488 | |
2489 void JavaThread::disable_stack_red_zone() { | |
2490 // The base notation is from the stacks point of view, growing downward. | |
2491 // We need to adjust it to work correctly with guard_memory() | |
2492 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2493 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2494 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
2495 warning("Attempt to unguard stack red zone failed."); | |
2496 } | |
2497 } | |
2498 | |
2499 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
2500 // ignore is there is no stack | |
2501 if (!has_last_Java_frame()) return; | |
2502 // traverse the stack frames. Starts from top frame. | |
2503 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2504 frame* fr = fst.current(); | |
2505 f(fr, fst.register_map()); | |
2506 } | |
2507 } | |
2508 | |
2509 | |
2510 #ifndef PRODUCT | |
2511 // Deoptimization | |
2512 // Function for testing deoptimization | |
2513 void JavaThread::deoptimize() { | |
2514 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2515 StackFrameStream fst(this, UseBiasedLocking); | |
2516 bool deopt = false; // Dump stack only if a deopt actually happens. | |
2517 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
2518 // Iterate over all frames in the thread and deoptimize | |
2519 for(; !fst.is_done(); fst.next()) { | |
2520 if(fst.current()->can_be_deoptimized()) { | |
2521 | |
2522 if (only_at) { | |
2523 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
2524 // consists of comma or carriage return separated numbers so | |
2525 // search for the current bci in that string. | |
2526 address pc = fst.current()->pc(); | |
2527 nmethod* nm = (nmethod*) fst.current()->cb(); | |
2528 ScopeDesc* sd = nm->scope_desc_at( pc); | |
2529 char buffer[8]; | |
2530 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
2531 size_t len = strlen(buffer); | |
2532 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
2533 while (found != NULL) { | |
2534 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
2535 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
2536 // Check that the bci found is bracketed by terminators. | |
2537 break; | |
2538 } | |
2539 found = strstr(found + 1, buffer); | |
2540 } | |
2541 if (!found) { | |
2542 continue; | |
2543 } | |
2544 } | |
2545 | |
2546 if (DebugDeoptimization && !deopt) { | |
2547 deopt = true; // One-time only print before deopt | |
2548 tty->print_cr("[BEFORE Deoptimization]"); | |
2549 trace_frames(); | |
2550 trace_stack(); | |
2551 } | |
2552 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2553 } | |
2554 } | |
2555 | |
2556 if (DebugDeoptimization && deopt) { | |
2557 tty->print_cr("[AFTER Deoptimization]"); | |
2558 trace_frames(); | |
2559 } | |
2560 } | |
2561 | |
2562 | |
2563 // Make zombies | |
2564 void JavaThread::make_zombies() { | |
2565 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2566 if (fst.current()->can_be_deoptimized()) { | |
2567 // it is a Java nmethod | |
2568 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
2569 nm->make_not_entrant(); | |
2570 } | |
2571 } | |
2572 } | |
2573 #endif // PRODUCT | |
2574 | |
2575 | |
2576 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
2577 if (!has_last_Java_frame()) return; | |
2578 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2579 StackFrameStream fst(this, UseBiasedLocking); | |
2580 for(; !fst.is_done(); fst.next()) { | |
2581 if (fst.current()->should_be_deoptimized()) { | |
2582 Deoptimization::deoptimize(this, *fst.current(), fst.register_map()); | |
2583 } | |
2584 } | |
2585 } | |
2586 | |
2587 | |
2588 // GC support | |
2589 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
2590 | |
2591 void JavaThread::gc_epilogue() { | |
2592 frames_do(frame_gc_epilogue); | |
2593 } | |
2594 | |
2595 | |
2596 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
2597 | |
2598 void JavaThread::gc_prologue() { | |
2599 frames_do(frame_gc_prologue); | |
2600 } | |
2601 | |
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2602 // If the caller is a NamedThread, then remember, in the current scope, |
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2603 // the given JavaThread in its _processed_thread field. |
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2604 class RememberProcessedThread: public StackObj { |
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|
2605 NamedThread* _cur_thr; |
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|
2606 public: |
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|
2607 RememberProcessedThread(JavaThread* jthr) { |
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2608 Thread* thread = Thread::current(); |
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2609 if (thread->is_Named_thread()) { |
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2610 _cur_thr = (NamedThread *)thread; |
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2611 _cur_thr->set_processed_thread(jthr); |
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2612 } else { |
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2613 _cur_thr = NULL; |
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|
2614 } |
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|
2615 } |
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2616 |
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2617 ~RememberProcessedThread() { |
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2618 if (_cur_thr) { |
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2619 _cur_thr->set_processed_thread(NULL); |
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2620 } |
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2621 } |
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2622 }; |
0 | 2623 |
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2624 void JavaThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
1166 | 2625 // Verify that the deferred card marks have been flushed. |
2626 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
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2627 |
0 | 2628 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
2629 // since there may be more than one thread using each ThreadProfiler. | |
2630 | |
2631 // Traverse the GCHandles | |
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|
2632 Thread::oops_do(f, cf); |
0 | 2633 |
2634 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2635 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2636 | |
2637 if (has_last_Java_frame()) { | |
1119
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2638 // Record JavaThread to GC thread |
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2639 RememberProcessedThread rpt(this); |
0 | 2640 |
2641 // Traverse the privileged stack | |
2642 if (_privileged_stack_top != NULL) { | |
2643 _privileged_stack_top->oops_do(f); | |
2644 } | |
2645 | |
2646 // traverse the registered growable array | |
2647 if (_array_for_gc != NULL) { | |
2648 for (int index = 0; index < _array_for_gc->length(); index++) { | |
2649 f->do_oop(_array_for_gc->adr_at(index)); | |
2650 } | |
2651 } | |
2652 | |
2653 // Traverse the monitor chunks | |
2654 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
2655 chunk->oops_do(f); | |
2656 } | |
2657 | |
2658 // Traverse the execution stack | |
2659 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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2660 fst.current()->oops_do(f, cf, fst.register_map()); |
0 | 2661 } |
2662 } | |
2663 | |
2664 // callee_target is never live across a gc point so NULL it here should | |
2665 // it still contain a methdOop. | |
2666 | |
2667 set_callee_target(NULL); | |
2668 | |
2669 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
2670 // If we have deferred set_locals there might be oops waiting to be | |
2671 // written | |
2672 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
2673 if (list != NULL) { | |
2674 for (int i = 0; i < list->length(); i++) { | |
2675 list->at(i)->oops_do(f); | |
2676 } | |
2677 } | |
2678 | |
2679 // Traverse instance variables at the end since the GC may be moving things | |
2680 // around using this function | |
2681 f->do_oop((oop*) &_threadObj); | |
2682 f->do_oop((oop*) &_vm_result); | |
2683 f->do_oop((oop*) &_exception_oop); | |
2684 f->do_oop((oop*) &_pending_async_exception); | |
2685 | |
2686 if (jvmti_thread_state() != NULL) { | |
2687 jvmti_thread_state()->oops_do(f); | |
2688 } | |
2689 } | |
2690 | |
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2691 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
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2692 Thread::nmethods_do(cf); // (super method is a no-op) |
0 | 2693 |
2694 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2695 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2696 | |
2697 if (has_last_Java_frame()) { | |
2698 // Traverse the execution stack | |
2699 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
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|
2700 fst.current()->nmethods_do(cf); |
0 | 2701 } |
2702 } | |
2703 } | |
2704 | |
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2705 void JavaThread::metadata_do(void f(Metadata*)) { |
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2706 Thread::metadata_do(f); |
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2707 if (has_last_Java_frame()) { |
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2708 // Traverse the execution stack to call f() on the methods in the stack |
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2709 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { |
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2710 fst.current()->metadata_do(f); |
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2711 } |
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2712 } else if (is_Compiler_thread()) { |
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2713 // need to walk ciMetadata in current compile tasks to keep alive. |
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2714 CompilerThread* ct = (CompilerThread*)this; |
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2715 if (ct->env() != NULL) { |
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2716 ct->env()->metadata_do(f); |
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2717 } |
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2718 } |
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2719 } |
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2720 |
0 | 2721 // Printing |
2722 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
2723 switch (_thread_state) { | |
2724 case _thread_uninitialized: return "_thread_uninitialized"; | |
2725 case _thread_new: return "_thread_new"; | |
2726 case _thread_new_trans: return "_thread_new_trans"; | |
2727 case _thread_in_native: return "_thread_in_native"; | |
2728 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
2729 case _thread_in_vm: return "_thread_in_vm"; | |
2730 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
2731 case _thread_in_Java: return "_thread_in_Java"; | |
2732 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
2733 case _thread_blocked: return "_thread_blocked"; | |
2734 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
2735 default: return "unknown thread state"; | |
2736 } | |
2737 } | |
2738 | |
2739 #ifndef PRODUCT | |
2740 void JavaThread::print_thread_state_on(outputStream *st) const { | |
2741 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
2742 }; | |
2743 void JavaThread::print_thread_state() const { | |
2744 print_thread_state_on(tty); | |
2745 }; | |
2746 #endif // PRODUCT | |
2747 | |
2748 // Called by Threads::print() for VM_PrintThreads operation | |
2749 void JavaThread::print_on(outputStream *st) const { | |
2750 st->print("\"%s\" ", get_thread_name()); | |
2751 oop thread_oop = threadObj(); | |
2752 if (thread_oop != NULL && java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
2753 Thread::print_on(st); | |
2754 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
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2755 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
0 | 2756 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
2757 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
2758 } | |
2759 #ifndef PRODUCT | |
2760 print_thread_state_on(st); | |
2761 _safepoint_state->print_on(st); | |
2762 #endif // PRODUCT | |
2763 } | |
2764 | |
2765 // Called by fatal error handler. The difference between this and | |
2766 // JavaThread::print() is that we can't grab lock or allocate memory. | |
2767 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
2768 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
2769 oop thread_obj = threadObj(); | |
2770 if (thread_obj != NULL) { | |
2771 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
2772 } | |
2773 st->print(" ["); | |
2774 st->print("%s", _get_thread_state_name(_thread_state)); | |
2775 if (osthread()) { | |
2776 st->print(", id=%d", osthread()->thread_id()); | |
2777 } | |
2778 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
2779 _stack_base - _stack_size, _stack_base); | |
2780 st->print("]"); | |
2781 return; | |
2782 } | |
2783 | |
2784 // Verification | |
2785 | |
2786 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
2787 | |
2788 void JavaThread::verify() { | |
2789 // Verify oops in the thread. | |
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2790 oops_do(&VerifyOopClosure::verify_oop, NULL); |
0 | 2791 |
2792 // Verify the stack frames. | |
2793 frames_do(frame_verify); | |
2794 } | |
2795 | |
2796 // CR 6300358 (sub-CR 2137150) | |
2797 // Most callers of this method assume that it can't return NULL but a | |
2798 // thread may not have a name whilst it is in the process of attaching to | |
2799 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
2800 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
2801 // if vm exit occurs during initialization). These cases can all be accounted | |
2802 // for such that this method never returns NULL. | |
2803 const char* JavaThread::get_thread_name() const { | |
2804 #ifdef ASSERT | |
2805 // early safepoints can hit while current thread does not yet have TLS | |
2806 if (!SafepointSynchronize::is_at_safepoint()) { | |
2807 Thread *cur = Thread::current(); | |
2808 if (!(cur->is_Java_thread() && cur == this)) { | |
2809 // Current JavaThreads are allowed to get their own name without | |
2810 // the Threads_lock. | |
2811 assert_locked_or_safepoint(Threads_lock); | |
2812 } | |
2813 } | |
2814 #endif // ASSERT | |
2815 return get_thread_name_string(); | |
2816 } | |
2817 | |
2818 // Returns a non-NULL representation of this thread's name, or a suitable | |
2819 // descriptive string if there is no set name | |
2820 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
2821 const char* name_str; | |
2822 oop thread_obj = threadObj(); | |
2823 if (thread_obj != NULL) { | |
2824 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
2825 if (name != NULL) { | |
2826 if (buf == NULL) { | |
2827 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2828 } | |
2829 else { | |
2830 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
2831 } | |
2832 } | |
4006 | 2833 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 |
0 | 2834 name_str = "<no-name - thread is attaching>"; |
2835 } | |
2836 else { | |
2837 name_str = Thread::name(); | |
2838 } | |
2839 } | |
2840 else { | |
2841 name_str = Thread::name(); | |
2842 } | |
2843 assert(name_str != NULL, "unexpected NULL thread name"); | |
2844 return name_str; | |
2845 } | |
2846 | |
2847 | |
2848 const char* JavaThread::get_threadgroup_name() const { | |
2849 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2850 oop thread_obj = threadObj(); | |
2851 if (thread_obj != NULL) { | |
2852 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2853 if (thread_group != NULL) { | |
2854 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
2855 // ThreadGroup.name can be null | |
2856 if (name != NULL) { | |
2857 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2858 return str; | |
2859 } | |
2860 } | |
2861 } | |
2862 return NULL; | |
2863 } | |
2864 | |
2865 const char* JavaThread::get_parent_name() const { | |
2866 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2867 oop thread_obj = threadObj(); | |
2868 if (thread_obj != NULL) { | |
2869 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2870 if (thread_group != NULL) { | |
2871 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
2872 if (parent != NULL) { | |
2873 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
2874 // ThreadGroup.name can be null | |
2875 if (name != NULL) { | |
2876 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2877 return str; | |
2878 } | |
2879 } | |
2880 } | |
2881 } | |
2882 return NULL; | |
2883 } | |
2884 | |
2885 ThreadPriority JavaThread::java_priority() const { | |
2886 oop thr_oop = threadObj(); | |
2887 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
2888 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
2889 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
2890 return priority; | |
2891 } | |
2892 | |
2893 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
2894 | |
2895 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
2896 // Link Java Thread object <-> C++ Thread | |
2897 | |
2898 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
2899 // and put it into a new Handle. The Handle "thread_oop" can then | |
2900 // be used to pass the C++ thread object to other methods. | |
2901 | |
2902 // Set the Java level thread object (jthread) field of the | |
2903 // new thread (a JavaThread *) to C++ thread object using the | |
2904 // "thread_oop" handle. | |
2905 | |
2906 // Set the thread field (a JavaThread *) of the | |
2907 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
2908 | |
2909 Handle thread_oop(Thread::current(), | |
2910 JNIHandles::resolve_non_null(jni_thread)); | |
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2911 assert(InstanceKlass::cast(thread_oop->klass())->is_linked(), |
0 | 2912 "must be initialized"); |
2913 set_threadObj(thread_oop()); | |
2914 java_lang_Thread::set_thread(thread_oop(), this); | |
2915 | |
2916 if (prio == NoPriority) { | |
2917 prio = java_lang_Thread::priority(thread_oop()); | |
2918 assert(prio != NoPriority, "A valid priority should be present"); | |
2919 } | |
2920 | |
2921 // Push the Java priority down to the native thread; needs Threads_lock | |
2922 Thread::set_priority(this, prio); | |
2923 | |
2924 // Add the new thread to the Threads list and set it in motion. | |
2925 // We must have threads lock in order to call Threads::add. | |
2926 // It is crucial that we do not block before the thread is | |
2927 // added to the Threads list for if a GC happens, then the java_thread oop | |
2928 // will not be visited by GC. | |
2929 Threads::add(this); | |
2930 } | |
2931 | |
2932 oop JavaThread::current_park_blocker() { | |
2933 // Support for JSR-166 locks | |
2934 oop thread_oop = threadObj(); | |
242 | 2935 if (thread_oop != NULL && |
2936 JDK_Version::current().supports_thread_park_blocker()) { | |
0 | 2937 return java_lang_Thread::park_blocker(thread_oop); |
2938 } | |
2939 return NULL; | |
2940 } | |
2941 | |
2942 | |
2943 void JavaThread::print_stack_on(outputStream* st) { | |
2944 if (!has_last_Java_frame()) return; | |
2945 ResourceMark rm; | |
2946 HandleMark hm; | |
2947 | |
2948 RegisterMap reg_map(this); | |
2949 vframe* start_vf = last_java_vframe(®_map); | |
2950 int count = 0; | |
2951 for (vframe* f = start_vf; f; f = f->sender() ) { | |
2952 if (f->is_java_frame()) { | |
2953 javaVFrame* jvf = javaVFrame::cast(f); | |
2954 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
2955 | |
2956 // Print out lock information | |
2957 if (JavaMonitorsInStackTrace) { | |
2958 jvf->print_lock_info_on(st, count); | |
2959 } | |
2960 } else { | |
2961 // Ignore non-Java frames | |
2962 } | |
2963 | |
2964 // Bail-out case for too deep stacks | |
2965 count++; | |
2966 if (MaxJavaStackTraceDepth == count) return; | |
2967 } | |
2968 } | |
2969 | |
2970 | |
2971 // JVMTI PopFrame support | |
2972 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
2973 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
2974 if (in_bytes(size_in_bytes) != 0) { | |
6197 | 2975 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes), mtThread); |
0 | 2976 _popframe_preserved_args_size = in_bytes(size_in_bytes); |
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2977 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
0 | 2978 } |
2979 } | |
2980 | |
2981 void* JavaThread::popframe_preserved_args() { | |
2982 return _popframe_preserved_args; | |
2983 } | |
2984 | |
2985 ByteSize JavaThread::popframe_preserved_args_size() { | |
2986 return in_ByteSize(_popframe_preserved_args_size); | |
2987 } | |
2988 | |
2989 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
2990 int sz = in_bytes(popframe_preserved_args_size()); | |
2991 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
2992 return in_WordSize(sz / wordSize); | |
2993 } | |
2994 | |
2995 void JavaThread::popframe_free_preserved_args() { | |
2996 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
6197 | 2997 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args, mtThread); |
0 | 2998 _popframe_preserved_args = NULL; |
2999 _popframe_preserved_args_size = 0; | |
3000 } | |
3001 | |
3002 #ifndef PRODUCT | |
3003 | |
3004 void JavaThread::trace_frames() { | |
3005 tty->print_cr("[Describe stack]"); | |
3006 int frame_no = 1; | |
3007 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
3008 tty->print(" %d. ", frame_no++); | |
3009 fst.current()->print_value_on(tty,this); | |
3010 tty->cr(); | |
3011 } | |
3012 } | |
3013 | |
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3014 class PrintAndVerifyOopClosure: public OopClosure { |
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3015 protected: |
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3016 template <class T> inline void do_oop_work(T* p) { |
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3017 oop obj = oopDesc::load_decode_heap_oop(p); |
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3018 if (obj == NULL) return; |
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3019 tty->print(INTPTR_FORMAT ": ", p); |
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3020 if (obj->is_oop_or_null()) { |
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3021 if (obj->is_objArray()) { |
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3022 tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj); |
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3023 } else { |
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3024 obj->print(); |
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3025 } |
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3026 } else { |
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3027 tty->print_cr("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj); |
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3028 } |
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3029 tty->cr(); |
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3030 } |
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3031 public: |
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3032 virtual void do_oop(oop* p) { do_oop_work(p); } |
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3033 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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3034 }; |
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3035 |
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3036 |
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3037 static void oops_print(frame* f, const RegisterMap *map) { |
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3038 PrintAndVerifyOopClosure print; |
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3039 f->print_value(); |
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3040 f->oops_do(&print, NULL, (RegisterMap*)map); |
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3041 } |
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3042 |
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3043 // Print our all the locations that contain oops and whether they are |
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3044 // valid or not. This useful when trying to find the oldest frame |
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3045 // where an oop has gone bad since the frame walk is from youngest to |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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diff
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|
3046 // oldest. |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
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diff
changeset
|
3047 void JavaThread::trace_oops() { |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
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diff
changeset
|
3048 tty->print_cr("[Trace oops]"); |
7588156f5cf9
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parents:
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diff
changeset
|
3049 frames_do(oops_print); |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
3899
diff
changeset
|
3050 } |
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diff
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|
3051 |
0 | 3052 |
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
3053 #ifdef ASSERT |
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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2416
diff
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|
3054 // Print or validate the layout of stack frames |
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parents:
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diff
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|
3055 void JavaThread::print_frame_layout(int depth, bool validate_only) { |
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diff
changeset
|
3056 ResourceMark rm; |
2e038ad0c1d0
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diff
changeset
|
3057 PRESERVE_EXCEPTION_MARK; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
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diff
changeset
|
3058 FrameValues values; |
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never
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diff
changeset
|
3059 int frame_no = 0; |
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parents:
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diff
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|
3060 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) { |
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7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
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|
3061 fst.current()->describe(values, ++frame_no); |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
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|
3062 if (depth == frame_no) break; |
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parents:
2416
diff
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|
3063 } |
2e038ad0c1d0
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parents:
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diff
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|
3064 if (validate_only) { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
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parents:
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diff
changeset
|
3065 values.validate(); |
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parents:
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diff
changeset
|
3066 } else { |
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parents:
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diff
changeset
|
3067 tty->print_cr("[Describe stack layout]"); |
4042
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twisti
parents:
4007
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|
3068 values.print(this); |
3336
2e038ad0c1d0
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parents:
2416
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|
3069 } |
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|
3070 } |
3388
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|
3071 #endif |
3336
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|
3072 |
0 | 3073 void JavaThread::trace_stack_from(vframe* start_vf) { |
3074 ResourceMark rm; | |
3075 int vframe_no = 1; | |
3076 for (vframe* f = start_vf; f; f = f->sender() ) { | |
3077 if (f->is_java_frame()) { | |
3078 javaVFrame::cast(f)->print_activation(vframe_no++); | |
3079 } else { | |
3080 f->print(); | |
3081 } | |
3082 if (vframe_no > StackPrintLimit) { | |
3083 tty->print_cr("...<more frames>..."); | |
3084 return; | |
3085 } | |
3086 } | |
3087 } | |
3088 | |
3089 | |
3090 void JavaThread::trace_stack() { | |
3091 if (!has_last_Java_frame()) return; | |
3092 ResourceMark rm; | |
3093 HandleMark hm; | |
3094 RegisterMap reg_map(this); | |
3095 trace_stack_from(last_java_vframe(®_map)); | |
3096 } | |
3097 | |
3098 | |
3099 #endif // PRODUCT | |
3100 | |
3101 | |
3102 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
3103 assert(reg_map != NULL, "a map must be given"); | |
3104 frame f = last_frame(); | |
3105 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
3106 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
3107 } | |
3108 return NULL; | |
3109 } | |
3110 | |
3111 | |
6725
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6964458: Reimplement class meta-data storage to use native memory
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3112 Klass* JavaThread::security_get_caller_class(int depth) { |
0 | 3113 vframeStream vfst(this); |
3114 vfst.security_get_caller_frame(depth); | |
3115 if (!vfst.at_end()) { | |
3116 return vfst.method()->method_holder(); | |
3117 } | |
3118 return NULL; | |
3119 } | |
3120 | |
3121 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
3122 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
3123 CompileBroker::compiler_thread_loop(); | |
3124 } | |
3125 | |
3126 // Create a CompilerThread | |
3127 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
3128 : JavaThread(&compiler_thread_entry) { | |
3129 _env = NULL; | |
3130 _log = NULL; | |
3131 _task = NULL; | |
3132 _queue = queue; | |
3133 _counters = counters; | |
1584 | 3134 _buffer_blob = NULL; |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3135 _scanned_nmethod = NULL; |
0 | 3136 |
3137 #ifndef PRODUCT | |
3138 _ideal_graph_printer = NULL; | |
3139 #endif | |
3140 } | |
3141 | |
3384
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3142 void CompilerThread::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3143 JavaThread::oops_do(f, cf); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3144 if (_scanned_nmethod != NULL && cf != NULL) { |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3145 // Safepoints can occur when the sweeper is scanning an nmethod so |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3146 // process it here to make sure it isn't unloaded in the middle of |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3147 // a scan. |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3148 cf->do_code_blob(_scanned_nmethod); |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3149 } |
f52ed367b66d
6996747: SIGSEGV in nmethod::cleanup_inline_caches / CompiledIC::verify
never
parents:
3336
diff
changeset
|
3150 } |
0 | 3151 |
3152 // ======= Threads ======== | |
3153 | |
3154 // The Threads class links together all active threads, and provides | |
3155 // operations over all threads. It is protected by its own Mutex | |
3156 // lock, which is also used in other contexts to protect thread | |
3157 // operations from having the thread being operated on from exiting | |
3158 // and going away unexpectedly (e.g., safepoint synchronization) | |
3159 | |
3160 JavaThread* Threads::_thread_list = NULL; | |
3161 int Threads::_number_of_threads = 0; | |
3162 int Threads::_number_of_non_daemon_threads = 0; | |
3163 int Threads::_return_code = 0; | |
3164 size_t JavaThread::_stack_size_at_create = 0; | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
3165 #ifdef ASSERT |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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diff
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|
3166 bool Threads::_vm_complete = false; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
changeset
|
3167 #endif |
0 | 3168 |
3169 // All JavaThreads | |
3170 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
3171 | |
3172 void os_stream(); | |
3173 | |
3174 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
3175 void Threads::threads_do(ThreadClosure* tc) { | |
3176 assert_locked_or_safepoint(Threads_lock); | |
3177 // ALL_JAVA_THREADS iterates through all JavaThreads | |
3178 ALL_JAVA_THREADS(p) { | |
3179 tc->do_thread(p); | |
3180 } | |
3181 // Someday we could have a table or list of all non-JavaThreads. | |
3182 // For now, just manually iterate through them. | |
3183 tc->do_thread(VMThread::vm_thread()); | |
3184 Universe::heap()->gc_threads_do(tc); | |
323
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3185 WatcherThread *wt = WatcherThread::watcher_thread(); |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
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diff
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|
3186 // Strictly speaking, the following NULL check isn't sufficient to make sure |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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286
diff
changeset
|
3187 // the data for WatcherThread is still valid upon being examined. However, |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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286
diff
changeset
|
3188 // considering that WatchThread terminates when the VM is on the way to |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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286
diff
changeset
|
3189 // 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
|
3190 // way to prevent termination of WatcherThread would be to acquire |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3191 // 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
|
3192 // checking in some cases. |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3193 if (wt != NULL) |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
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diff
changeset
|
3194 tc->do_thread(wt); |
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xlu
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286
diff
changeset
|
3195 |
0 | 3196 // If CompilerThreads ever become non-JavaThreads, add them here |
3197 } | |
3198 | |
3199 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
3200 | |
242 | 3201 extern void JDK_Version_init(); |
3202 | |
0 | 3203 // Check version |
3204 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
3205 | |
3206 // Initialize the output stream module | |
3207 ostream_init(); | |
3208 | |
3209 // Process java launcher properties. | |
3210 Arguments::process_sun_java_launcher_properties(args); | |
3211 | |
3212 // Initialize the os module before using TLS | |
3213 os::init(); | |
3214 | |
3215 // Initialize system properties. | |
3216 Arguments::init_system_properties(); | |
3217 | |
242 | 3218 // So that JDK version can be used as a discrimintor when parsing arguments |
3219 JDK_Version_init(); | |
3220 | |
1864
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3221 // Update/Initialize System properties after JDK version number is known |
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3222 Arguments::init_version_specific_system_properties(); |
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3223 |
0 | 3224 // Parse arguments |
3225 jint parse_result = Arguments::parse(args); | |
3226 if (parse_result != JNI_OK) return parse_result; | |
3227 | |
3228 if (PauseAtStartup) { | |
3229 os::pause(); | |
3230 } | |
3231 | |
4006 | 3232 #ifndef USDT2 |
0 | 3233 HS_DTRACE_PROBE(hotspot, vm__init__begin); |
4006 | 3234 #else /* USDT2 */ |
3235 HOTSPOT_VM_INIT_BEGIN(); | |
3236 #endif /* USDT2 */ | |
0 | 3237 |
3238 // Record VM creation timing statistics | |
3239 TraceVmCreationTime create_vm_timer; | |
3240 create_vm_timer.start(); | |
3241 | |
3242 // Timing (must come after argument parsing) | |
3243 TraceTime timer("Create VM", TraceStartupTime); | |
3244 | |
3245 // Initialize the os module after parsing the args | |
3246 jint os_init_2_result = os::init_2(); | |
3247 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
3248 | |
6197 | 3249 // intialize TLS |
3250 ThreadLocalStorage::init(); | |
3251 | |
3252 // Bootstrap native memory tracking, so it can start recording memory | |
3253 // activities before worker thread is started. This is the first phase | |
3254 // of bootstrapping, VM is currently running in single-thread mode. | |
3255 MemTracker::bootstrap_single_thread(); | |
3256 | |
0 | 3257 // Initialize output stream logging |
3258 ostream_init_log(); | |
3259 | |
3260 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
3261 // Must be before create_vm_init_agents() | |
3262 if (Arguments::init_libraries_at_startup()) { | |
3263 convert_vm_init_libraries_to_agents(); | |
3264 } | |
3265 | |
3266 // Launch -agentlib/-agentpath and converted -Xrun agents | |
3267 if (Arguments::init_agents_at_startup()) { | |
3268 create_vm_init_agents(); | |
3269 } | |
3270 | |
3271 // Initialize Threads state | |
3272 _thread_list = NULL; | |
3273 _number_of_threads = 0; | |
3274 _number_of_non_daemon_threads = 0; | |
3275 | |
3276 // Initialize global data structures and create system classes in heap | |
3277 vm_init_globals(); | |
3278 | |
3279 // Attach the main thread to this os thread | |
3280 JavaThread* main_thread = new JavaThread(); | |
3281 main_thread->set_thread_state(_thread_in_vm); | |
3282 // must do this before set_active_handles and initialize_thread_local_storage | |
3283 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
3284 // change the stack size recorded here to one based on the java thread | |
3285 // stacksize. This adjusted size is what is used to figure the placement | |
3286 // of the guard pages. | |
3287 main_thread->record_stack_base_and_size(); | |
3288 main_thread->initialize_thread_local_storage(); | |
3289 | |
3290 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
3291 | |
3292 if (!main_thread->set_as_starting_thread()) { | |
3293 vm_shutdown_during_initialization( | |
3294 "Failed necessary internal allocation. Out of swap space"); | |
3295 delete main_thread; | |
3296 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3297 return JNI_ENOMEM; | |
3298 } | |
3299 | |
3300 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
3301 // crash Linux VM, see notes in os_linux.cpp. | |
3302 main_thread->create_stack_guard_pages(); | |
3303 | |
1878 | 3304 // Initialize Java-Level synchronization subsystem |
3305 ObjectMonitor::Initialize() ; | |
0 | 3306 |
6197 | 3307 // Second phase of bootstrapping, VM is about entering multi-thread mode |
3308 MemTracker::bootstrap_multi_thread(); | |
3309 | |
0 | 3310 // Initialize global modules |
3311 jint status = init_globals(); | |
3312 if (status != JNI_OK) { | |
3313 delete main_thread; | |
3314 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3315 return status; | |
3316 } | |
3317 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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1608
diff
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|
3318 // Should be done after the heap is fully created |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
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1608
diff
changeset
|
3319 main_thread->cache_global_variables(); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
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1608
diff
changeset
|
3320 |
0 | 3321 HandleMark hm; |
3322 | |
3323 { MutexLocker mu(Threads_lock); | |
3324 Threads::add(main_thread); | |
3325 } | |
3326 | |
3327 // Any JVMTI raw monitors entered in onload will transition into | |
3328 // real raw monitor. VM is setup enough here for raw monitor enter. | |
3329 JvmtiExport::transition_pending_onload_raw_monitors(); | |
3330 | |
3331 if (VerifyBeforeGC && | |
3332 Universe::heap()->total_collections() >= VerifyGCStartAt) { | |
3333 Universe::heap()->prepare_for_verify(); | |
3334 Universe::verify(); // make sure we're starting with a clean slate | |
3335 } | |
3336 | |
6197 | 3337 // Fully start NMT |
3338 MemTracker::start(); | |
3339 | |
0 | 3340 // Create the VMThread |
3341 { TraceTime timer("Start VMThread", TraceStartupTime); | |
3342 VMThread::create(); | |
3343 Thread* vmthread = VMThread::vm_thread(); | |
3344 | |
3345 if (!os::create_thread(vmthread, os::vm_thread)) | |
3346 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
3347 | |
3348 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
3349 // Monitors can have spurious returns, must always check another state flag | |
3350 { | |
3351 MutexLocker ml(Notify_lock); | |
3352 os::start_thread(vmthread); | |
3353 while (vmthread->active_handles() == NULL) { | |
3354 Notify_lock->wait(); | |
3355 } | |
3356 } | |
3357 } | |
3358 | |
3359 assert (Universe::is_fully_initialized(), "not initialized"); | |
3360 EXCEPTION_MARK; | |
3361 | |
3362 // At this point, the Universe is initialized, but we have not executed | |
3363 // any byte code. Now is a good time (the only time) to dump out the | |
3364 // internal state of the JVM for sharing. | |
3365 if (DumpSharedSpaces) { | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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6198
diff
changeset
|
3366 MetaspaceShared::preload_and_dump(CHECK_0); |
0 | 3367 ShouldNotReachHere(); |
3368 } | |
3369 | |
3370 // Always call even when there are not JVMTI environments yet, since environments | |
3371 // may be attached late and JVMTI must track phases of VM execution | |
3372 JvmtiExport::enter_start_phase(); | |
3373 | |
3374 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
3375 JvmtiExport::post_vm_start(); | |
3376 | |
3377 { | |
3378 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
3379 | |
3380 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3381 create_vm_init_libraries(); | |
3382 } | |
3383 | |
3384 if (InitializeJavaLangString) { | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
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2162
diff
changeset
|
3385 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
0 | 3386 } else { |
3387 warning("java.lang.String not initialized"); | |
3388 } | |
3389 | |
18
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3390 if (AggressiveOpts) { |
192
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
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62
diff
changeset
|
3391 { |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
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62
diff
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|
3392 // 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
|
3393 // 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
|
3394 #ifdef ASSERT |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
3395 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
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diff
changeset
|
3396 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
|
3397 #endif |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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diff
changeset
|
3398 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
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diff
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|
3399 KlassHandle k = KlassHandle(THREAD, k_o); |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
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62
diff
changeset
|
3400 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
|
3401 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3402 ik->initialize(CHECK_0); |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3403 fieldDescriptor fd; |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3404 // 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
|
3405 if (ik->find_local_field(vmSymbols::frontCacheEnabled_name(), vmSymbols::bool_signature(), &fd)) { |
2376
c7f3d0b4570f
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diff
changeset
|
3406 k()->java_mirror()->bool_field_put(fd.offset(), true); |
192
6d13fcb3663f
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parents:
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diff
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|
3407 } |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3408 } |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3409 |
6d13fcb3663f
6714404: Add UseStringCache switch to enable String caching under AggressiveOpts
kvn
parents:
62
diff
changeset
|
3410 if (UseStringCache) { |
669
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
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441
diff
changeset
|
3411 // Forcibly initialize java/lang/StringValue and mutate the private |
192
6d13fcb3663f
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kvn
parents:
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diff
changeset
|
3412 // static final "stringCacheEnabled" field before we start creating instances |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
3413 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
|
3414 // 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
|
3415 if (k_o != NULL) { |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3416 KlassHandle k = KlassHandle(THREAD, k_o); |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3417 instanceKlassHandle ik = instanceKlassHandle(THREAD, k()); |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3418 ik->initialize(CHECK_0); |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3419 fieldDescriptor fd; |
eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
phh
parents:
441
diff
changeset
|
3420 // 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
|
3421 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
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parents:
2302
diff
changeset
|
3422 k()->java_mirror()->bool_field_put(fd.offset(), true); |
669
eca19a8425b5
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441
diff
changeset
|
3423 } |
192
6d13fcb3663f
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62
diff
changeset
|
3424 } |
18
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3425 } |
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3426 } |
c7d713375c94
6621621: HashMap front cache should be enabled only with AggressiveOpts
phh
parents:
0
diff
changeset
|
3427 |
0 | 3428 // Initialize java_lang.System (needed before creating the thread) |
3429 if (InitializeJavaLangSystem) { | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3430 initialize_class(vmSymbols::java_lang_System(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3431 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); |
0 | 3432 Handle thread_group = create_initial_thread_group(CHECK_0); |
3433 Universe::set_main_thread_group(thread_group()); | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3434 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); |
0 | 3435 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); |
3436 main_thread->set_threadObj(thread_object); | |
3437 // Set thread status to running since main thread has | |
3438 // been started and running. | |
3439 java_lang_Thread::set_thread_status(thread_object, | |
3440 java_lang_Thread::RUNNABLE); | |
3441 | |
3442 // The VM preresolve methods to these classes. Make sure that get initialized | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3443 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3444 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); |
0 | 3445 // The VM creates & returns objects of this class. Make sure it's initialized. |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3446 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); |
0 | 3447 call_initializeSystemClass(CHECK_0); |
6181 | 3448 |
3449 // get the Java runtime name after java.lang.System is initialized | |
3450 JDK_Version::set_runtime_name(get_java_runtime_name(THREAD)); | |
0 | 3451 } else { |
3452 warning("java.lang.System not initialized"); | |
3453 } | |
3454 | |
3455 // an instance of OutOfMemory exception has been allocated earlier | |
3456 if (InitializeJavaLangExceptionsErrors) { | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3457 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3458 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3459 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3460 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3461 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3462 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); |
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3463 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); |
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3464 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK_0); |
0 | 3465 } else { |
3466 warning("java.lang.OutOfMemoryError has not been initialized"); | |
3467 warning("java.lang.NullPointerException has not been initialized"); | |
3468 warning("java.lang.ClassCastException has not been initialized"); | |
3469 warning("java.lang.ArrayStoreException has not been initialized"); | |
3470 warning("java.lang.ArithmeticException has not been initialized"); | |
3471 warning("java.lang.StackOverflowError has not been initialized"); | |
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3472 warning("java.lang.IllegalArgumentException has not been initialized"); |
0 | 3473 } |
2416
38fea01eb669
6817525: turn on method handle functionality by default for JSR 292
twisti
parents:
2376
diff
changeset
|
3474 } |
0 | 3475 |
3476 // See : bugid 4211085. | |
3477 // Background : the static initializer of java.lang.Compiler tries to read | |
3478 // property"java.compiler" and read & write property "java.vm.info". | |
3479 // When a security manager is installed through the command line | |
3480 // option "-Djava.security.manager", the above properties are not | |
3481 // readable and the static initializer for java.lang.Compiler fails | |
3482 // resulting in a NoClassDefFoundError. This can happen in any | |
3483 // user code which calls methods in java.lang.Compiler. | |
3484 // Hack : the hack is to pre-load and initialize this class, so that only | |
3485 // system domains are on the stack when the properties are read. | |
3486 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
3487 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
3488 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
3489 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
3490 // 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
|
3491 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
0 | 3492 |
3493 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
3494 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
3495 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
3496 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
3497 // This should also be taken out as soon as 4211383 gets fixed. | |
3498 reset_vm_info_property(CHECK_0); | |
3499 | |
3500 quicken_jni_functions(); | |
3501 | |
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3502 // Must be run after init_ft which initializes ft_enabled |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3503 if (TRACE_INITIALIZE() != JNI_OK) { |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3504 vm_exit_during_initialization("Failed to initialize tracing backend"); |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3505 } |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3506 |
0 | 3507 // Set flag that basic initialization has completed. Used by exceptions and various |
3508 // debug stuff, that does not work until all basic classes have been initialized. | |
3509 set_init_completed(); | |
3510 | |
4006 | 3511 #ifndef USDT2 |
0 | 3512 HS_DTRACE_PROBE(hotspot, vm__init__end); |
4006 | 3513 #else /* USDT2 */ |
3514 HOTSPOT_VM_INIT_END(); | |
3515 #endif /* USDT2 */ | |
0 | 3516 |
3517 // record VM initialization completion time | |
3518 Management::record_vm_init_completed(); | |
3519 | |
3520 // Compute system loader. Note that this has to occur after set_init_completed, since | |
3521 // valid exceptions may be thrown in the process. | |
3522 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
3523 // set_init_completed has just been called, causing exceptions not to be shortcut | |
3524 // anymore. We call vm_exit_during_initialization directly instead. | |
3525 SystemDictionary::compute_java_system_loader(THREAD); | |
3526 if (HAS_PENDING_EXCEPTION) { | |
3527 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3528 } | |
3529 | |
3530 #ifndef SERIALGC | |
3531 // Support for ConcurrentMarkSweep. This should be cleaned up | |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3532 // 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
|
3533 // once things are properly refactored. XXX YSR |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3534 if (UseConcMarkSweepGC || UseG1GC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3535 if (UseConcMarkSweepGC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3536 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3537 } else { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3538 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3539 } |
0 | 3540 if (HAS_PENDING_EXCEPTION) { |
3541 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3542 } | |
3543 } | |
3544 #endif // SERIALGC | |
3545 | |
3546 // Always call even when there are not JVMTI environments yet, since environments | |
3547 // may be attached late and JVMTI must track phases of VM execution | |
3548 JvmtiExport::enter_live_phase(); | |
3549 | |
3550 // Signal Dispatcher needs to be started before VMInit event is posted | |
3551 os::signal_init(); | |
3552 | |
3553 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
3554 if (!DisableAttachMechanism) { | |
3555 if (StartAttachListener || AttachListener::init_at_startup()) { | |
3556 AttachListener::init(); | |
3557 } | |
3558 } | |
3559 | |
3560 // Launch -Xrun agents | |
3561 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
3562 // back-end can launch with -Xdebug -Xrunjdwp. | |
3563 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3564 create_vm_init_libraries(); | |
3565 } | |
3566 | |
6002
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3567 // 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
|
3568 JvmtiExport::post_vm_initialized(); |
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3569 |
4800
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3570 if (!TRACE_START()) { |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3571 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3572 } |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3573 |
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3574 if (CleanChunkPoolAsync) { |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3575 Chunk::start_chunk_pool_cleaner_task(); |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3576 } |
0 | 3577 |
3578 // initialize compiler(s) | |
3579 CompileBroker::compilation_init(); | |
3580 | |
3581 Management::initialize(THREAD); | |
3582 if (HAS_PENDING_EXCEPTION) { | |
3583 // management agent fails to start possibly due to | |
3584 // configuration problem and is responsible for printing | |
3585 // stack trace if appropriate. Simply exit VM. | |
3586 vm_exit(1); | |
3587 } | |
3588 | |
3589 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
3590 if (Arguments::has_alloc_profile()) AllocationProfiler::engage(); | |
3591 if (MemProfiling) MemProfiler::engage(); | |
3592 StatSampler::engage(); | |
3593 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
3594 | |
3595 BiasedLocking::init(); | |
3596 | |
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3597 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
|
3598 call_postVMInitHook(THREAD); |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3599 // 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
|
3600 // exceptions and provide means of diagnosis. |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3601 if (HAS_PENDING_EXCEPTION) { |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3602 CLEAR_PENDING_EXCEPTION; |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3603 } |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3604 } |
0 | 3605 |
3606 // Start up the WatcherThread if there are any periodic tasks | |
3607 // NOTE: All PeriodicTasks should be registered by now. If they | |
3608 // aren't, late joiners might appear to start slowly (we might | |
3609 // take a while to process their first tick). | |
3610 if (PeriodicTask::num_tasks() > 0) { | |
3611 WatcherThread::start(); | |
3612 } | |
3613 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3614 // Give os specific code one last chance to start |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3615 os::init_3(); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3616 |
0 | 3617 create_vm_timer.end(); |
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3618 #ifdef ASSERT |
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3619 _vm_complete = true; |
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3620 #endif |
0 | 3621 return JNI_OK; |
3622 } | |
3623 | |
3624 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
3625 extern "C" { | |
3626 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
3627 } | |
3628 // Find a command line agent library and return its entry point for | |
3629 // -agentlib: -agentpath: -Xrun | |
3630 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
3631 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
3632 OnLoadEntry_t on_load_entry = NULL; | |
3633 void *library = agent->os_lib(); // check if we have looked it up before | |
3634 | |
3635 if (library == NULL) { | |
3636 char buffer[JVM_MAXPATHLEN]; | |
3637 char ebuf[1024]; | |
3638 const char *name = agent->name(); | |
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3639 const char *msg = "Could not find agent library "; |
0 | 3640 |
3641 if (agent->is_absolute_path()) { | |
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3642 library = os::dll_load(name, ebuf, sizeof ebuf); |
0 | 3643 if (library == NULL) { |
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3644 const char *sub_msg = " in absolute path, with error: "; |
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3645 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
6197 | 3646 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
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3647 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3648 // If we can't find the agent, exit. |
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3649 vm_exit_during_initialization(buf, NULL); |
6197 | 3650 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
0 | 3651 } |
3652 } else { | |
3653 // Try to load the agent from the standard dll directory | |
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3654 os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), name); |
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3655 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3656 #ifdef KERNEL |
3657 // Download instrument dll | |
3658 if (library == NULL && strcmp(name, "instrument") == 0) { | |
3659 char *props = Arguments::get_kernel_properties(); | |
3660 char *home = Arguments::get_java_home(); | |
3661 const char *fmt = "%s/bin/java %s -Dkernel.background.download=false" | |
3662 " sun.jkernel.DownloadManager -download client_jvm"; | |
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3663 size_t length = strlen(props) + strlen(home) + strlen(fmt) + 1; |
6197 | 3664 char *cmd = NEW_C_HEAP_ARRAY(char, length, mtThread); |
0 | 3665 jio_snprintf(cmd, length, fmt, home, props); |
3666 int status = os::fork_and_exec(cmd); | |
3667 FreeHeap(props); | |
3668 if (status == -1) { | |
3669 warning(cmd); | |
3670 vm_exit_during_initialization("fork_and_exec failed: %s", | |
3671 strerror(errno)); | |
3672 } | |
6197 | 3673 FREE_C_HEAP_ARRAY(char, cmd, mtThread); |
0 | 3674 // when this comes back the instrument.dll should be where it belongs. |
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3675 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3676 } |
3677 #endif // KERNEL | |
3678 if (library == NULL) { // Try the local directory | |
3679 char ns[1] = {0}; | |
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3680 os::dll_build_name(buffer, sizeof(buffer), ns, name); |
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3681 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
0 | 3682 if (library == NULL) { |
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3683 const char *sub_msg = " on the library path, with error: "; |
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3684 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
6197 | 3685 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
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3686 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3687 // If we can't find the agent, exit. |
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3688 vm_exit_during_initialization(buf, NULL); |
6197 | 3689 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
0 | 3690 } |
3691 } | |
3692 } | |
3693 agent->set_os_lib(library); | |
3694 } | |
3695 | |
3696 // Find the OnLoad function. | |
3697 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
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3698 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, os::dll_lookup(library, on_load_symbols[symbol_index])); |
0 | 3699 if (on_load_entry != NULL) break; |
3700 } | |
3701 return on_load_entry; | |
3702 } | |
3703 | |
3704 // Find the JVM_OnLoad entry point | |
3705 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
3706 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
3707 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3708 } | |
3709 | |
3710 // Find the Agent_OnLoad entry point | |
3711 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
3712 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
3713 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3714 } | |
3715 | |
3716 // For backwards compatibility with -Xrun | |
3717 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
3718 // treated like -agentpath: | |
3719 // Must be called before agent libraries are created | |
3720 void Threads::convert_vm_init_libraries_to_agents() { | |
3721 AgentLibrary* agent; | |
3722 AgentLibrary* next; | |
3723 | |
3724 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
3725 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
3726 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3727 | |
3728 // If there is an JVM_OnLoad function it will get called later, | |
3729 // otherwise see if there is an Agent_OnLoad | |
3730 if (on_load_entry == NULL) { | |
3731 on_load_entry = lookup_agent_on_load(agent); | |
3732 if (on_load_entry != NULL) { | |
3733 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
3734 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
3735 Arguments::convert_library_to_agent(agent); | |
3736 } else { | |
3737 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
3738 } | |
3739 } | |
3740 } | |
3741 } | |
3742 | |
3743 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
3744 // Invokes Agent_OnLoad | |
3745 // Called very early -- before JavaThreads exist | |
3746 void Threads::create_vm_init_agents() { | |
3747 extern struct JavaVM_ main_vm; | |
3748 AgentLibrary* agent; | |
3749 | |
3750 JvmtiExport::enter_onload_phase(); | |
3751 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3752 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
3753 | |
3754 if (on_load_entry != NULL) { | |
3755 // Invoke the Agent_OnLoad function | |
3756 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3757 if (err != JNI_OK) { | |
3758 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
3759 } | |
3760 } else { | |
3761 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
3762 } | |
3763 } | |
3764 JvmtiExport::enter_primordial_phase(); | |
3765 } | |
3766 | |
3767 extern "C" { | |
3768 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
3769 } | |
3770 | |
3771 void Threads::shutdown_vm_agents() { | |
3772 // Send any Agent_OnUnload notifications | |
3773 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
3774 extern struct JavaVM_ main_vm; | |
3775 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3776 | |
3777 // Find the Agent_OnUnload function. | |
3778 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
3779 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
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3780 os::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
0 | 3781 |
3782 // Invoke the Agent_OnUnload function | |
3783 if (unload_entry != NULL) { | |
3784 JavaThread* thread = JavaThread::current(); | |
3785 ThreadToNativeFromVM ttn(thread); | |
3786 HandleMark hm(thread); | |
3787 (*unload_entry)(&main_vm); | |
3788 break; | |
3789 } | |
3790 } | |
3791 } | |
3792 } | |
3793 | |
3794 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
3795 // Invokes JVM_OnLoad | |
3796 void Threads::create_vm_init_libraries() { | |
3797 extern struct JavaVM_ main_vm; | |
3798 AgentLibrary* agent; | |
3799 | |
3800 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
3801 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3802 | |
3803 if (on_load_entry != NULL) { | |
3804 // Invoke the JVM_OnLoad function | |
3805 JavaThread* thread = JavaThread::current(); | |
3806 ThreadToNativeFromVM ttn(thread); | |
3807 HandleMark hm(thread); | |
3808 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3809 if (err != JNI_OK) { | |
3810 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
3811 } | |
3812 } else { | |
3813 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
3814 } | |
3815 } | |
3816 } | |
3817 | |
3818 // Last thread running calls java.lang.Shutdown.shutdown() | |
3819 void JavaThread::invoke_shutdown_hooks() { | |
3820 HandleMark hm(this); | |
3821 | |
3822 // We could get here with a pending exception, if so clear it now. | |
3823 if (this->has_pending_exception()) { | |
3824 this->clear_pending_exception(); | |
3825 } | |
3826 | |
3827 EXCEPTION_MARK; | |
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3828 Klass* k = |
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3829 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
0 | 3830 THREAD); |
3831 if (k != NULL) { | |
3832 // SystemDictionary::resolve_or_null will return null if there was | |
3833 // an exception. If we cannot load the Shutdown class, just don't | |
3834 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
3835 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
3836 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
3837 // was called, the Shutdown class would have already been loaded | |
3838 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
3839 instanceKlassHandle shutdown_klass (THREAD, k); | |
3840 JavaValue result(T_VOID); | |
3841 JavaCalls::call_static(&result, | |
3842 shutdown_klass, | |
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3843 vmSymbols::shutdown_method_name(), |
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3844 vmSymbols::void_method_signature(), |
0 | 3845 THREAD); |
3846 } | |
3847 CLEAR_PENDING_EXCEPTION; | |
3848 } | |
3849 | |
3850 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
3851 // the program falls off the end of main(). Another VM exit path is through | |
3852 // vm_exit() when the program calls System.exit() to return a value or when | |
3853 // there is a serious error in VM. The two shutdown paths are not exactly | |
3854 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
3855 // and VM_Exit op at VM level. | |
3856 // | |
3857 // Shutdown sequence: | |
6197 | 3858 // + Shutdown native memory tracking if it is on |
0 | 3859 // + Wait until we are the last non-daemon thread to execute |
3860 // <-- every thing is still working at this moment --> | |
3861 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
3862 // shutdown hooks, run finalizers if finalization-on-exit | |
3863 // + Call before_exit(), prepare for VM exit | |
3864 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
3865 // currently the only user of this mechanism is File.deleteOnExit()) | |
3866 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
3867 // post thread end and vm death events to JVMTI, | |
3868 // stop signal thread | |
3869 // + Call JavaThread::exit(), it will: | |
3870 // > release JNI handle blocks, remove stack guard pages | |
3871 // > remove this thread from Threads list | |
3872 // <-- no more Java code from this thread after this point --> | |
3873 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
3874 // the compiler threads at safepoint | |
3875 // <-- do not use anything that could get blocked by Safepoint --> | |
3876 // + Disable tracing at JNI/JVM barriers | |
3877 // + Set _vm_exited flag for threads that are still running native code | |
3878 // + Delete this thread | |
3879 // + Call exit_globals() | |
3880 // > deletes tty | |
3881 // > deletes PerfMemory resources | |
3882 // + Return to caller | |
3883 | |
3884 bool Threads::destroy_vm() { | |
3885 JavaThread* thread = JavaThread::current(); | |
3886 | |
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3887 #ifdef ASSERT |
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3888 _vm_complete = false; |
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3889 #endif |
0 | 3890 // Wait until we are the last non-daemon thread to execute |
3891 { MutexLocker nu(Threads_lock); | |
3892 while (Threads::number_of_non_daemon_threads() > 1 ) | |
3893 // This wait should make safepoint checks, wait without a timeout, | |
3894 // and wait as a suspend-equivalent condition. | |
3895 // | |
3896 // Note: If the FlatProfiler is running and this thread is waiting | |
3897 // for another non-daemon thread to finish, then the FlatProfiler | |
3898 // is waiting for the external suspend request on this thread to | |
3899 // complete. wait_for_ext_suspend_completion() will eventually | |
3900 // timeout, but that takes time. Making this wait a suspend- | |
3901 // equivalent condition solves that timeout problem. | |
3902 // | |
3903 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
3904 Mutex::_as_suspend_equivalent_flag); | |
3905 } | |
3906 | |
6197 | 3907 // Shutdown NMT before exit. Otherwise, |
3908 // it will run into trouble when system destroys static variables. | |
3909 MemTracker::shutdown(MemTracker::NMT_normal); | |
3910 | |
0 | 3911 // Hang forever on exit if we are reporting an error. |
3912 if (ShowMessageBoxOnError && is_error_reported()) { | |
3913 os::infinite_sleep(); | |
3914 } | |
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3915 os::wait_for_keypress_at_exit(); |
0 | 3916 |
3917 if (JDK_Version::is_jdk12x_version()) { | |
3918 // We are the last thread running, so check if finalizers should be run. | |
3919 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
3920 HandleMark rm(thread); | |
3921 Universe::run_finalizers_on_exit(); | |
3922 } else { | |
3923 // run Java level shutdown hooks | |
3924 thread->invoke_shutdown_hooks(); | |
3925 } | |
3926 | |
3927 before_exit(thread); | |
3928 | |
3929 thread->exit(true); | |
3930 | |
3931 // Stop VM thread. | |
3932 { | |
3933 // 4945125 The vm thread comes to a safepoint during exit. | |
3934 // GC vm_operations can get caught at the safepoint, and the | |
3935 // heap is unparseable if they are caught. Grab the Heap_lock | |
3936 // to prevent this. The GC vm_operations will not be able to | |
3937 // queue until after the vm thread is dead. | |
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3938 // After this point, we'll never emerge out of the safepoint before |
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3939 // the VM exits, so concurrent GC threads do not need to be explicitly |
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3940 // stopped; they remain inactive until the process exits. |
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3941 // Note: some concurrent G1 threads may be running during a safepoint, |
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3942 // but these will not be accessing the heap, just some G1-specific side |
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3943 // data structures that are not accessed by any other threads but them |
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3944 // after this point in a terminal safepoint. |
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3945 |
0 | 3946 MutexLocker ml(Heap_lock); |
3947 | |
3948 VMThread::wait_for_vm_thread_exit(); | |
3949 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
3950 VMThread::destroy(); | |
3951 } | |
3952 | |
3953 // clean up ideal graph printers | |
3954 #if defined(COMPILER2) && !defined(PRODUCT) | |
3955 IdealGraphPrinter::clean_up(); | |
3956 #endif | |
3957 | |
3958 // Now, all Java threads are gone except daemon threads. Daemon threads | |
3959 // running Java code or in VM are stopped by the Safepoint. However, | |
3960 // daemon threads executing native code are still running. But they | |
3961 // will be stopped at native=>Java/VM barriers. Note that we can't | |
3962 // simply kill or suspend them, as it is inherently deadlock-prone. | |
3963 | |
3964 #ifndef PRODUCT | |
3965 // disable function tracing at JNI/JVM barriers | |
3966 TraceJNICalls = false; | |
3967 TraceJVMCalls = false; | |
3968 TraceRuntimeCalls = false; | |
3969 #endif | |
3970 | |
3971 VM_Exit::set_vm_exited(); | |
3972 | |
3973 notify_vm_shutdown(); | |
3974 | |
3975 delete thread; | |
3976 | |
3977 // exit_globals() will delete tty | |
3978 exit_globals(); | |
3979 | |
3980 return true; | |
3981 } | |
3982 | |
3983 | |
3984 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
3985 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
3986 return is_supported_jni_version(version); | |
3987 } | |
3988 | |
3989 | |
3990 jboolean Threads::is_supported_jni_version(jint version) { | |
3991 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
3992 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
3993 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
3994 return JNI_FALSE; | |
3995 } | |
3996 | |
3997 | |
3998 void Threads::add(JavaThread* p, bool force_daemon) { | |
3999 // The threads lock must be owned at this point | |
4000 assert_locked_or_safepoint(Threads_lock); | |
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4001 |
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4002 // See the comment for this method in thread.hpp for its purpose and |
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4003 // why it is called here. |
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4004 p->initialize_queues(); |
0 | 4005 p->set_next(_thread_list); |
4006 _thread_list = p; | |
4007 _number_of_threads++; | |
4008 oop threadObj = p->threadObj(); | |
4009 bool daemon = true; | |
4010 // Bootstrapping problem: threadObj can be null for initial | |
4011 // JavaThread (or for threads attached via JNI) | |
4012 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
4013 _number_of_non_daemon_threads++; | |
4014 daemon = false; | |
4015 } | |
4016 | |
6197 | 4017 p->set_safepoint_visible(true); |
4018 | |
0 | 4019 ThreadService::add_thread(p, daemon); |
4020 | |
4021 // Possible GC point. | |
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4022 Events::log(p, "Thread added: " INTPTR_FORMAT, p); |
0 | 4023 } |
4024 | |
4025 void Threads::remove(JavaThread* p) { | |
4026 // Extra scope needed for Thread_lock, so we can check | |
4027 // that we do not remove thread without safepoint code notice | |
4028 { MutexLocker ml(Threads_lock); | |
4029 | |
4030 assert(includes(p), "p must be present"); | |
4031 | |
4032 JavaThread* current = _thread_list; | |
4033 JavaThread* prev = NULL; | |
4034 | |
4035 while (current != p) { | |
4036 prev = current; | |
4037 current = current->next(); | |
4038 } | |
4039 | |
4040 if (prev) { | |
4041 prev->set_next(current->next()); | |
4042 } else { | |
4043 _thread_list = p->next(); | |
4044 } | |
4045 _number_of_threads--; | |
4046 oop threadObj = p->threadObj(); | |
4047 bool daemon = true; | |
4048 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
4049 _number_of_non_daemon_threads--; | |
4050 daemon = false; | |
4051 | |
4052 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
4053 // on destroy_vm will wake up. | |
4054 if (number_of_non_daemon_threads() == 1) | |
4055 Threads_lock->notify_all(); | |
4056 } | |
4057 ThreadService::remove_thread(p, daemon); | |
4058 | |
4059 // Make sure that safepoint code disregard this thread. This is needed since | |
4060 // the thread might mess around with locks after this point. This can cause it | |
4061 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
4062 // of this thread since it is removed from the queue. | |
4063 p->set_terminated_value(); | |
6197 | 4064 |
4065 // Now, this thread is not visible to safepoint | |
4066 p->set_safepoint_visible(false); | |
4067 | |
0 | 4068 } // unlock Threads_lock |
4069 | |
4070 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
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4071 Events::log(p, "Thread exited: " INTPTR_FORMAT, p); |
0 | 4072 } |
4073 | |
4074 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
4075 bool Threads::includes(JavaThread* p) { | |
4076 assert(Threads_lock->is_locked(), "sanity check"); | |
4077 ALL_JAVA_THREADS(q) { | |
4078 if (q == p ) { | |
4079 return true; | |
4080 } | |
4081 } | |
4082 return false; | |
4083 } | |
4084 | |
4085 // Operations on the Threads list for GC. These are not explicitly locked, | |
4086 // but the garbage collector must provide a safe context for them to run. | |
4087 // In particular, these things should never be called when the Threads_lock | |
4088 // is held by some other thread. (Note: the Safepoint abstraction also | |
4089 // uses the Threads_lock to gurantee this property. It also makes sure that | |
4090 // all threads gets blocked when exiting or starting). | |
4091 | |
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4092 void Threads::oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 4093 ALL_JAVA_THREADS(p) { |
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4094 p->oops_do(f, cf); |
0 | 4095 } |
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4096 VMThread::vm_thread()->oops_do(f, cf); |
0 | 4097 } |
4098 | |
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4099 void Threads::possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf) { |
0 | 4100 // Introduce a mechanism allowing parallel threads to claim threads as |
4101 // root groups. Overhead should be small enough to use all the time, | |
4102 // even in sequential code. | |
4103 SharedHeap* sh = SharedHeap::heap(); | |
4095
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4104 // Cannot yet substitute active_workers for n_par_threads |
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4105 // because of G1CollectedHeap::verify() use of |
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4106 // SharedHeap::process_strong_roots(). n_par_threads == 0 will |
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4107 // turn off parallelism in process_strong_roots while active_workers |
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4108 // is being used for parallelism elsewhere. |
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4109 bool is_par = sh->n_par_threads() > 0; |
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4110 assert(!is_par || |
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4111 (SharedHeap::heap()->n_par_threads() == |
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4112 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
0 | 4113 int cp = SharedHeap::heap()->strong_roots_parity(); |
4114 ALL_JAVA_THREADS(p) { | |
4115 if (p->claim_oops_do(is_par, cp)) { | |
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4116 p->oops_do(f, cf); |
0 | 4117 } |
4118 } | |
4119 VMThread* vmt = VMThread::vm_thread(); | |
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4120 if (vmt->claim_oops_do(is_par, cp)) { |
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4121 vmt->oops_do(f, cf); |
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4122 } |
0 | 4123 } |
4124 | |
4125 #ifndef SERIALGC | |
4126 // Used by ParallelScavenge | |
4127 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
4128 ALL_JAVA_THREADS(p) { | |
4129 q->enqueue(new ThreadRootsTask(p)); | |
4130 } | |
4131 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
4132 } | |
4133 | |
4134 // Used by Parallel Old | |
4135 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
4136 ALL_JAVA_THREADS(p) { | |
4137 q->enqueue(new ThreadRootsMarkingTask(p)); | |
4138 } | |
4139 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
4140 } | |
4141 #endif // SERIALGC | |
4142 | |
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4143 void Threads::nmethods_do(CodeBlobClosure* cf) { |
0 | 4144 ALL_JAVA_THREADS(p) { |
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4145 p->nmethods_do(cf); |
0 | 4146 } |
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4147 VMThread::vm_thread()->nmethods_do(cf); |
0 | 4148 } |
4149 | |
6725
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4150 void Threads::metadata_do(void f(Metadata*)) { |
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4151 ALL_JAVA_THREADS(p) { |
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4152 p->metadata_do(f); |
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4153 } |
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4154 } |
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4155 |
0 | 4156 void Threads::gc_epilogue() { |
4157 ALL_JAVA_THREADS(p) { | |
4158 p->gc_epilogue(); | |
4159 } | |
4160 } | |
4161 | |
4162 void Threads::gc_prologue() { | |
4163 ALL_JAVA_THREADS(p) { | |
4164 p->gc_prologue(); | |
4165 } | |
4166 } | |
4167 | |
4168 void Threads::deoptimized_wrt_marked_nmethods() { | |
4169 ALL_JAVA_THREADS(p) { | |
4170 p->deoptimized_wrt_marked_nmethods(); | |
4171 } | |
4172 } | |
4173 | |
4174 | |
4175 // Get count Java threads that are waiting to enter the specified monitor. | |
4176 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
4177 address monitor, bool doLock) { | |
4178 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
4179 "must grab Threads_lock or be at safepoint"); | |
4180 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
4181 | |
4182 int i = 0; | |
4183 { | |
4184 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4185 ALL_JAVA_THREADS(p) { | |
4186 if (p->is_Compiler_thread()) continue; | |
4187 | |
4188 address pending = (address)p->current_pending_monitor(); | |
4189 if (pending == monitor) { // found a match | |
4190 if (i < count) result->append(p); // save the first count matches | |
4191 i++; | |
4192 } | |
4193 } | |
4194 } | |
4195 return result; | |
4196 } | |
4197 | |
4198 | |
4199 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
4200 assert(doLock || | |
4201 Threads_lock->owned_by_self() || | |
4202 SafepointSynchronize::is_at_safepoint(), | |
4203 "must grab Threads_lock or be at safepoint"); | |
4204 | |
4205 // NULL owner means not locked so we can skip the search | |
4206 if (owner == NULL) return NULL; | |
4207 | |
4208 { | |
4209 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4210 ALL_JAVA_THREADS(p) { | |
4211 // first, see if owner is the address of a Java thread | |
4212 if (owner == (address)p) return p; | |
4213 } | |
4214 } | |
4215 assert(UseHeavyMonitors == false, "Did not find owning Java thread with UseHeavyMonitors enabled"); | |
4216 if (UseHeavyMonitors) return NULL; | |
4217 | |
4218 // | |
4219 // If we didn't find a matching Java thread and we didn't force use of | |
4220 // heavyweight monitors, then the owner is the stack address of the | |
4221 // Lock Word in the owning Java thread's stack. | |
4222 // | |
4223 JavaThread* the_owner = NULL; | |
4224 { | |
4225 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4226 ALL_JAVA_THREADS(q) { | |
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4227 if (q->is_lock_owned(owner)) { |
0 | 4228 the_owner = q; |
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4229 break; |
0 | 4230 } |
4231 } | |
4232 } | |
4233 assert(the_owner != NULL, "Did not find owning Java thread for lock word address"); | |
4234 return the_owner; | |
4235 } | |
4236 | |
4237 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
4238 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
4239 char buf[32]; | |
4240 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
4241 | |
4242 st->print_cr("Full thread dump %s (%s %s):", | |
4243 Abstract_VM_Version::vm_name(), | |
4244 Abstract_VM_Version::vm_release(), | |
4245 Abstract_VM_Version::vm_info_string() | |
4246 ); | |
4247 st->cr(); | |
4248 | |
4249 #ifndef SERIALGC | |
4250 // Dump concurrent locks | |
4251 ConcurrentLocksDump concurrent_locks; | |
4252 if (print_concurrent_locks) { | |
4253 concurrent_locks.dump_at_safepoint(); | |
4254 } | |
4255 #endif // SERIALGC | |
4256 | |
4257 ALL_JAVA_THREADS(p) { | |
4258 ResourceMark rm; | |
4259 p->print_on(st); | |
4260 if (print_stacks) { | |
4261 if (internal_format) { | |
4262 p->trace_stack(); | |
4263 } else { | |
4264 p->print_stack_on(st); | |
4265 } | |
4266 } | |
4267 st->cr(); | |
4268 #ifndef SERIALGC | |
4269 if (print_concurrent_locks) { | |
4270 concurrent_locks.print_locks_on(p, st); | |
4271 } | |
4272 #endif // SERIALGC | |
4273 } | |
4274 | |
4275 VMThread::vm_thread()->print_on(st); | |
4276 st->cr(); | |
4277 Universe::heap()->print_gc_threads_on(st); | |
4278 WatcherThread* wt = WatcherThread::watcher_thread(); | |
4279 if (wt != NULL) wt->print_on(st); | |
4280 st->cr(); | |
4281 CompileBroker::print_compiler_threads_on(st); | |
4282 st->flush(); | |
4283 } | |
4284 | |
4285 // Threads::print_on_error() is called by fatal error handler. It's possible | |
4286 // that VM is not at safepoint and/or current thread is inside signal handler. | |
4287 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
4288 // memory (even in resource area), it might deadlock the error handler. | |
4289 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
4290 bool found_current = false; | |
4291 st->print_cr("Java Threads: ( => current thread )"); | |
4292 ALL_JAVA_THREADS(thread) { | |
4293 bool is_current = (current == thread); | |
4294 found_current = found_current || is_current; | |
4295 | |
4296 st->print("%s", is_current ? "=>" : " "); | |
4297 | |
4298 st->print(PTR_FORMAT, thread); | |
4299 st->print(" "); | |
4300 thread->print_on_error(st, buf, buflen); | |
4301 st->cr(); | |
4302 } | |
4303 st->cr(); | |
4304 | |
4305 st->print_cr("Other Threads:"); | |
4306 if (VMThread::vm_thread()) { | |
4307 bool is_current = (current == VMThread::vm_thread()); | |
4308 found_current = found_current || is_current; | |
4309 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
4310 | |
4311 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
4312 st->print(" "); | |
4313 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
4314 st->cr(); | |
4315 } | |
4316 WatcherThread* wt = WatcherThread::watcher_thread(); | |
4317 if (wt != NULL) { | |
4318 bool is_current = (current == wt); | |
4319 found_current = found_current || is_current; | |
4320 st->print("%s", is_current ? "=>" : " "); | |
4321 | |
4322 st->print(PTR_FORMAT, wt); | |
4323 st->print(" "); | |
4324 wt->print_on_error(st, buf, buflen); | |
4325 st->cr(); | |
4326 } | |
4327 if (!found_current) { | |
4328 st->cr(); | |
4329 st->print("=>" PTR_FORMAT " (exited) ", current); | |
4330 current->print_on_error(st, buf, buflen); | |
4331 st->cr(); | |
4332 } | |
4333 } | |
4334 | |
1878 | 4335 // Internal SpinLock and Mutex |
4336 // Based on ParkEvent | |
4337 | |
4338 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
0 | 4339 // |
1878 | 4340 // We employ SpinLocks _only for low-contention, fixed-length |
4341 // short-duration critical sections where we're concerned | |
4342 // about native mutex_t or HotSpot Mutex:: latency. | |
4343 // The mux construct provides a spin-then-block mutual exclusion | |
4344 // mechanism. | |
4345 // | |
4346 // Testing has shown that contention on the ListLock guarding gFreeList | |
4347 // is common. If we implement ListLock as a simple SpinLock it's common | |
4348 // for the JVM to devolve to yielding with little progress. This is true | |
4349 // despite the fact that the critical sections protected by ListLock are | |
4350 // extremely short. | |
0 | 4351 // |
1878 | 4352 // TODO-FIXME: ListLock should be of type SpinLock. |
4353 // We should make this a 1st-class type, integrated into the lock | |
4354 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
4355 // should have sufficient padding to avoid false-sharing and excessive | |
4356 // cache-coherency traffic. | |
4357 | |
4358 | |
4359 typedef volatile int SpinLockT ; | |
4360 | |
4361 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
4362 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
4363 return ; // normal fast-path return | |
4364 } | |
4365 | |
4366 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
4367 TEVENT (SpinAcquire - ctx) ; | |
4368 int ctr = 0 ; | |
4369 int Yields = 0 ; | |
0 | 4370 for (;;) { |
1878 | 4371 while (*adr != 0) { |
4372 ++ctr ; | |
4373 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
4374 if (Yields > 5) { | |
4375 // Consider using a simple NakedSleep() instead. | |
4376 // Then SpinAcquire could be called by non-JVM threads | |
4377 Thread::current()->_ParkEvent->park(1) ; | |
4378 } else { | |
4379 os::NakedYield() ; | |
4380 ++Yields ; | |
4381 } | |
4382 } else { | |
4383 SpinPause() ; | |
0 | 4384 } |
1878 | 4385 } |
4386 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
0 | 4387 } |
4388 } | |
4389 | |
1878 | 4390 void Thread::SpinRelease (volatile int * adr) { |
4391 assert (*adr != 0, "invariant") ; | |
4392 OrderAccess::fence() ; // guarantee at least release consistency. | |
4393 // Roach-motel semantics. | |
4394 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
4395 // but prior LDs and STs within the critical section can't be allowed | |
4396 // to reorder or float past the ST that releases the lock. | |
4397 *adr = 0 ; | |
0 | 4398 } |
4399 | |
1878 | 4400 // muxAcquire and muxRelease: |
4401 // | |
4402 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
4403 // The LSB of the word is set IFF the lock is held. | |
4404 // The remainder of the word points to the head of a singly-linked list | |
4405 // of threads blocked on the lock. | |
4406 // | |
4407 // * The current implementation of muxAcquire-muxRelease uses its own | |
4408 // dedicated Thread._MuxEvent instance. If we're interested in | |
4409 // minimizing the peak number of extant ParkEvent instances then | |
4410 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
4411 // as certain invariants were satisfied. Specifically, care would need | |
4412 // to be taken with regards to consuming unpark() "permits". | |
4413 // A safe rule of thumb is that a thread would never call muxAcquire() | |
4414 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
4415 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
4416 // consume an unpark() permit intended for monitorenter, for instance. | |
4417 // One way around this would be to widen the restricted-range semaphore | |
4418 // implemented in park(). Another alternative would be to provide | |
4419 // multiple instances of the PlatformEvent() for each thread. One | |
4420 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
4421 // | |
4422 // * Usage: | |
4423 // -- Only as leaf locks | |
4424 // -- for short-term locking only as muxAcquire does not perform | |
4425 // thread state transitions. | |
4426 // | |
4427 // Alternatives: | |
4428 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
4429 // but with parking or spin-then-park instead of pure spinning. | |
4430 // * Use Taura-Oyama-Yonenzawa locks. | |
4431 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
4432 // (List,LockByte). Acquire will CAS the full lockword while Release | |
4433 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
4434 // acquiring threads use timers (ParkTimed) to detect and recover from | |
4435 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
4436 // boundaries by using placement-new. | |
4437 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
4438 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
4439 // The validity of the backlinks must be ratified before we trust the value. | |
4440 // If the backlinks are invalid the exiting thread must back-track through the | |
4441 // the forward links, which are always trustworthy. | |
4442 // * Add a successor indication. The LockWord is currently encoded as | |
4443 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
4444 // to provide the usual futile-wakeup optimization. | |
4445 // See RTStt for details. | |
4446 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
4447 // | |
4448 | |
4449 | |
4450 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
4451 enum MuxBits { LOCKBIT = 1 } ; | |
4452 | |
4453 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
4454 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4455 if (w == 0) return ; | |
4456 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4457 return ; | |
4458 } | |
4459 | |
4460 TEVENT (muxAcquire - Contention) ; | |
4461 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
4462 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
0 | 4463 for (;;) { |
1878 | 4464 int its = (os::is_MP() ? 100 : 0) + 1 ; |
4465 | |
4466 // Optional spin phase: spin-then-park strategy | |
4467 while (--its >= 0) { | |
4468 w = *Lock ; | |
4469 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4470 return ; | |
4471 } | |
4472 } | |
4473 | |
4474 Self->reset() ; | |
4475 Self->OnList = intptr_t(Lock) ; | |
4476 // The following fence() isn't _strictly necessary as the subsequent | |
4477 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4478 OrderAccess::fence(); | |
4479 for (;;) { | |
4480 w = *Lock ; | |
4481 if ((w & LOCKBIT) == 0) { | |
4482 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4483 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
4484 return ; | |
4485 } | |
4486 continue ; // Interference -- *Lock changed -- Just retry | |
0 | 4487 } |
1878 | 4488 assert (w & LOCKBIT, "invariant") ; |
4489 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4490 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
4491 } | |
4492 | |
4493 while (Self->OnList != 0) { | |
4494 Self->park() ; | |
4495 } | |
0 | 4496 } |
4497 } | |
4498 | |
1878 | 4499 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
4500 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4501 if (w == 0) return ; | |
4502 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4503 return ; | |
4504 } | |
4505 | |
4506 TEVENT (muxAcquire - Contention) ; | |
4507 ParkEvent * ReleaseAfter = NULL ; | |
4508 if (ev == NULL) { | |
4509 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
4510 } | |
4511 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
4512 for (;;) { | |
4513 guarantee (ev->OnList == 0, "invariant") ; | |
4514 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
4515 | |
4516 // Optional spin phase: spin-then-park strategy | |
4517 while (--its >= 0) { | |
4518 w = *Lock ; | |
4519 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4520 if (ReleaseAfter != NULL) { | |
4521 ParkEvent::Release (ReleaseAfter) ; | |
4522 } | |
4523 return ; | |
4524 } | |
4525 } | |
4526 | |
4527 ev->reset() ; | |
4528 ev->OnList = intptr_t(Lock) ; | |
4529 // The following fence() isn't _strictly necessary as the subsequent | |
4530 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4531 OrderAccess::fence(); | |
4532 for (;;) { | |
4533 w = *Lock ; | |
4534 if ((w & LOCKBIT) == 0) { | |
4535 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4536 ev->OnList = 0 ; | |
4537 // We call ::Release while holding the outer lock, thus | |
4538 // artificially lengthening the critical section. | |
4539 // Consider deferring the ::Release() until the subsequent unlock(), | |
4540 // after we've dropped the outer lock. | |
4541 if (ReleaseAfter != NULL) { | |
4542 ParkEvent::Release (ReleaseAfter) ; | |
4543 } | |
4544 return ; | |
4545 } | |
4546 continue ; // Interference -- *Lock changed -- Just retry | |
4547 } | |
4548 assert (w & LOCKBIT, "invariant") ; | |
4549 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4550 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
4551 } | |
4552 | |
4553 while (ev->OnList != 0) { | |
4554 ev->park() ; | |
4555 } | |
4556 } | |
4557 } | |
4558 | |
4559 // Release() must extract a successor from the list and then wake that thread. | |
4560 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
4561 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
4562 // Release() would : | |
4563 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
4564 // (B) Extract a successor from the private list "in-hand" | |
4565 // (C) attempt to CAS() the residual back into *Lock over null. | |
4566 // If there were any newly arrived threads and the CAS() would fail. | |
4567 // In that case Release() would detach the RATs, re-merge the list in-hand | |
4568 // with the RATs and repeat as needed. Alternately, Release() might | |
4569 // detach and extract a successor, but then pass the residual list to the wakee. | |
4570 // The wakee would be responsible for reattaching and remerging before it | |
4571 // competed for the lock. | |
4572 // | |
4573 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
4574 // multiple concurrent pushers, but only one popper or detacher. | |
4575 // This implementation pops from the head of the list. This is unfair, | |
4576 // but tends to provide excellent throughput as hot threads remain hot. | |
4577 // (We wake recently run threads first). | |
4578 | |
4579 void Thread::muxRelease (volatile intptr_t * Lock) { | |
4580 for (;;) { | |
4581 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
4582 assert (w & LOCKBIT, "invariant") ; | |
4583 if (w == LOCKBIT) return ; | |
4584 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
4585 assert (List != NULL, "invariant") ; | |
4586 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
4587 ParkEvent * nxt = List->ListNext ; | |
4588 | |
4589 // The following CAS() releases the lock and pops the head element. | |
4590 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
4591 continue ; | |
4592 } | |
4593 List->OnList = 0 ; | |
4594 OrderAccess::fence() ; | |
4595 List->unpark () ; | |
4596 return ; | |
4597 } | |
4598 } | |
4599 | |
4600 | |
0 | 4601 void Threads::verify() { |
4602 ALL_JAVA_THREADS(p) { | |
4603 p->verify(); | |
4604 } | |
4605 VMThread* thread = VMThread::vm_thread(); | |
4606 if (thread != NULL) thread->verify(); | |
4607 } |