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annotate src/share/vm/services/threadService.hpp @ 14517:3812c088b945
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author | lana |
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date | Thu, 06 Mar 2014 10:37:26 -0800 |
parents | de6a9e811145 |
children | 4ca6dc0799b6 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_SERVICES_THREADSERVICE_HPP |
26 #define SHARE_VM_SERVICES_THREADSERVICE_HPP | |
27 | |
28 #include "classfile/javaClasses.hpp" | |
29 #include "runtime/handles.hpp" | |
30 #include "runtime/init.hpp" | |
31 #include "runtime/jniHandles.hpp" | |
32 #include "runtime/objectMonitor.hpp" | |
33 #include "runtime/objectMonitor.inline.hpp" | |
34 #include "runtime/perfData.hpp" | |
35 #include "services/management.hpp" | |
36 #include "services/serviceUtil.hpp" | |
37 | |
0 | 38 class OopClosure; |
39 class ThreadDumpResult; | |
40 class ThreadStackTrace; | |
41 class ThreadSnapshot; | |
42 class StackFrameInfo; | |
43 class ThreadConcurrentLocks; | |
44 class DeadlockCycle; | |
45 | |
46 // VM monitoring and management support for the thread and | |
47 // synchronization subsystem | |
48 // | |
49 // Thread contention monitoring is disabled by default. | |
50 // When enabled, the VM will begin measuring the accumulated | |
51 // elapsed time a thread blocked on synchronization. | |
52 // | |
53 class ThreadService : public AllStatic { | |
54 private: | |
55 // These counters could be moved to Threads class | |
56 static PerfCounter* _total_threads_count; | |
57 static PerfVariable* _live_threads_count; | |
58 static PerfVariable* _peak_threads_count; | |
59 static PerfVariable* _daemon_threads_count; | |
60 | |
61 // These 2 counters are atomically incremented once the thread is exiting. | |
62 // They will be atomically decremented when ThreadService::remove_thread is called. | |
63 static volatile int _exiting_threads_count; | |
64 static volatile int _exiting_daemon_threads_count; | |
65 | |
66 static bool _thread_monitoring_contention_enabled; | |
67 static bool _thread_cpu_time_enabled; | |
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68 static bool _thread_allocated_memory_enabled; |
0 | 69 |
70 // Need to keep the list of thread dump result that | |
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71 // keep references to Method* since thread dump can be |
0 | 72 // requested by multiple threads concurrently. |
73 static ThreadDumpResult* _threaddump_list; | |
74 | |
75 public: | |
76 static void init(); | |
77 static void add_thread(JavaThread* thread, bool daemon); | |
78 static void remove_thread(JavaThread* thread, bool daemon); | |
79 static void current_thread_exiting(JavaThread* jt); | |
80 | |
81 static bool set_thread_monitoring_contention(bool flag); | |
82 static bool is_thread_monitoring_contention() { return _thread_monitoring_contention_enabled; } | |
83 | |
84 static bool set_thread_cpu_time_enabled(bool flag); | |
85 static bool is_thread_cpu_time_enabled() { return _thread_cpu_time_enabled; } | |
86 | |
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87 static bool set_thread_allocated_memory_enabled(bool flag); |
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88 static bool is_thread_allocated_memory_enabled() { return _thread_cpu_time_enabled; } |
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89 |
0 | 90 static jlong get_total_thread_count() { return _total_threads_count->get_value(); } |
91 static jlong get_peak_thread_count() { return _peak_threads_count->get_value(); } | |
92 static jlong get_live_thread_count() { return _live_threads_count->get_value() - _exiting_threads_count; } | |
93 static jlong get_daemon_thread_count() { return _daemon_threads_count->get_value() - _exiting_daemon_threads_count; } | |
94 | |
95 static int exiting_threads_count() { return _exiting_threads_count; } | |
96 static int exiting_daemon_threads_count() { return _exiting_daemon_threads_count; } | |
97 | |
98 // Support for thread dump | |
99 static void add_thread_dump(ThreadDumpResult* dump); | |
100 static void remove_thread_dump(ThreadDumpResult* dump); | |
101 | |
102 static Handle get_current_contended_monitor(JavaThread* thread); | |
103 | |
104 // This function is called by JVM_DumpThreads. | |
105 static Handle dump_stack_traces(GrowableArray<instanceHandle>* threads, | |
106 int num_threads, TRAPS); | |
107 | |
108 static void reset_peak_thread_count(); | |
109 static void reset_contention_count_stat(JavaThread* thread); | |
110 static void reset_contention_time_stat(JavaThread* thread); | |
111 | |
112 static DeadlockCycle* find_deadlocks_at_safepoint(bool object_monitors_only); | |
113 | |
114 // GC support | |
115 static void oops_do(OopClosure* f); | |
13391 | 116 static void metadata_do(void f(Metadata*)); |
0 | 117 }; |
118 | |
119 // Per-thread Statistics for synchronization | |
6197 | 120 class ThreadStatistics : public CHeapObj<mtInternal> { |
0 | 121 private: |
122 // The following contention statistics are only updated by | |
123 // the thread owning these statistics when contention occurs. | |
124 | |
125 jlong _contended_enter_count; | |
126 elapsedTimer _contended_enter_timer; | |
127 jlong _monitor_wait_count; | |
128 elapsedTimer _monitor_wait_timer; | |
129 jlong _sleep_count; | |
130 elapsedTimer _sleep_timer; | |
131 | |
132 | |
133 // These two reset flags are set to true when another thread | |
134 // requests to reset the statistics. The actual statistics | |
135 // are reset when the thread contention occurs and attempts | |
136 // to update the statistics. | |
137 bool _count_pending_reset; | |
138 bool _timer_pending_reset; | |
139 | |
140 // Keep accurate times for potentially recursive class operations | |
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141 int _perf_recursion_counts[6]; |
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142 elapsedTimer _perf_timers[6]; |
0 | 143 |
144 // utility functions | |
145 void check_and_reset_count() { | |
146 if (!_count_pending_reset) return; | |
147 _contended_enter_count = 0; | |
148 _monitor_wait_count = 0; | |
149 _sleep_count = 0; | |
150 _count_pending_reset = 0; | |
151 } | |
152 void check_and_reset_timer() { | |
153 if (!_timer_pending_reset) return; | |
154 _contended_enter_timer.reset(); | |
155 _monitor_wait_timer.reset(); | |
156 _sleep_timer.reset(); | |
157 _timer_pending_reset = 0; | |
158 } | |
159 | |
160 public: | |
161 ThreadStatistics(); | |
162 | |
163 jlong contended_enter_count() { return (_count_pending_reset ? 0 : _contended_enter_count); } | |
164 jlong contended_enter_ticks() { return (_timer_pending_reset ? 0 : _contended_enter_timer.active_ticks()); } | |
165 jlong monitor_wait_count() { return (_count_pending_reset ? 0 : _monitor_wait_count); } | |
166 jlong monitor_wait_ticks() { return (_timer_pending_reset ? 0 : _monitor_wait_timer.active_ticks()); } | |
167 jlong sleep_count() { return (_count_pending_reset ? 0 : _sleep_count); } | |
168 jlong sleep_ticks() { return (_timer_pending_reset ? 0 : _sleep_timer.active_ticks()); } | |
169 | |
170 void monitor_wait() { check_and_reset_count(); _monitor_wait_count++; } | |
171 void monitor_wait_begin() { check_and_reset_timer(); _monitor_wait_timer.start(); } | |
172 void monitor_wait_end() { _monitor_wait_timer.stop(); check_and_reset_timer(); } | |
173 | |
174 void thread_sleep() { check_and_reset_count(); _sleep_count++; } | |
175 void thread_sleep_begin() { check_and_reset_timer(); _sleep_timer.start(); } | |
176 void thread_sleep_end() { _sleep_timer.stop(); check_and_reset_timer(); } | |
177 | |
178 void contended_enter() { check_and_reset_count(); _contended_enter_count++; } | |
179 void contended_enter_begin() { check_and_reset_timer(); _contended_enter_timer.start(); } | |
180 void contended_enter_end() { _contended_enter_timer.stop(); check_and_reset_timer(); } | |
181 | |
182 void reset_count_stat() { _count_pending_reset = true; } | |
183 void reset_time_stat() { _timer_pending_reset = true; } | |
184 | |
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185 int* perf_recursion_counts_addr() { return _perf_recursion_counts; } |
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186 elapsedTimer* perf_timers_addr() { return _perf_timers; } |
0 | 187 }; |
188 | |
189 // Thread snapshot to represent the thread state and statistics | |
6197 | 190 class ThreadSnapshot : public CHeapObj<mtInternal> { |
0 | 191 private: |
192 JavaThread* _thread; | |
193 oop _threadObj; | |
194 java_lang_Thread::ThreadStatus _thread_status; | |
195 | |
196 bool _is_ext_suspended; | |
197 bool _is_in_native; | |
198 | |
199 jlong _contended_enter_ticks; | |
200 jlong _contended_enter_count; | |
201 jlong _monitor_wait_ticks; | |
202 jlong _monitor_wait_count; | |
203 jlong _sleep_ticks; | |
204 jlong _sleep_count; | |
205 oop _blocker_object; | |
206 oop _blocker_object_owner; | |
207 | |
208 ThreadStackTrace* _stack_trace; | |
209 ThreadConcurrentLocks* _concurrent_locks; | |
210 ThreadSnapshot* _next; | |
211 | |
212 public: | |
213 // Dummy snapshot | |
214 ThreadSnapshot() : _thread(NULL), _threadObj(NULL), _stack_trace(NULL), _concurrent_locks(NULL), _next(NULL), | |
215 _blocker_object(NULL), _blocker_object_owner(NULL) {}; | |
216 ThreadSnapshot(JavaThread* thread); | |
217 ~ThreadSnapshot(); | |
218 | |
219 java_lang_Thread::ThreadStatus thread_status() { return _thread_status; } | |
220 | |
221 oop threadObj() const { return _threadObj; } | |
222 | |
223 void set_next(ThreadSnapshot* n) { _next = n; } | |
224 | |
225 bool is_ext_suspended() { return _is_ext_suspended; } | |
226 bool is_in_native() { return _is_in_native; } | |
227 | |
228 jlong contended_enter_count() { return _contended_enter_count; } | |
229 jlong contended_enter_ticks() { return _contended_enter_ticks; } | |
230 jlong monitor_wait_count() { return _monitor_wait_count; } | |
231 jlong monitor_wait_ticks() { return _monitor_wait_ticks; } | |
232 jlong sleep_count() { return _sleep_count; } | |
233 jlong sleep_ticks() { return _sleep_ticks; } | |
234 | |
235 | |
236 oop blocker_object() { return _blocker_object; } | |
237 oop blocker_object_owner() { return _blocker_object_owner; } | |
238 | |
239 ThreadSnapshot* next() const { return _next; } | |
240 ThreadStackTrace* get_stack_trace() { return _stack_trace; } | |
241 ThreadConcurrentLocks* get_concurrent_locks() { return _concurrent_locks; } | |
242 | |
243 void dump_stack_at_safepoint(int max_depth, bool with_locked_monitors); | |
244 void set_concurrent_locks(ThreadConcurrentLocks* l) { _concurrent_locks = l; } | |
245 void oops_do(OopClosure* f); | |
13391 | 246 void metadata_do(void f(Metadata*)); |
0 | 247 }; |
248 | |
6197 | 249 class ThreadStackTrace : public CHeapObj<mtInternal> { |
0 | 250 private: |
251 JavaThread* _thread; | |
252 int _depth; // number of stack frames added | |
253 bool _with_locked_monitors; | |
254 GrowableArray<StackFrameInfo*>* _frames; | |
255 GrowableArray<oop>* _jni_locked_monitors; | |
256 | |
257 public: | |
258 | |
259 ThreadStackTrace(JavaThread* thread, bool with_locked_monitors); | |
260 ~ThreadStackTrace(); | |
261 | |
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262 JavaThread* thread() { return _thread; } |
0 | 263 StackFrameInfo* stack_frame_at(int i) { return _frames->at(i); } |
264 int get_stack_depth() { return _depth; } | |
265 | |
266 void add_stack_frame(javaVFrame* jvf); | |
267 void dump_stack_at_safepoint(int max_depth); | |
268 Handle allocate_fill_stack_trace_element_array(TRAPS); | |
269 void oops_do(OopClosure* f); | |
13391 | 270 void metadata_do(void f(Metadata*)); |
0 | 271 GrowableArray<oop>* jni_locked_monitors() { return _jni_locked_monitors; } |
272 int num_jni_locked_monitors() { return (_jni_locked_monitors != NULL ? _jni_locked_monitors->length() : 0); } | |
273 | |
274 bool is_owned_monitor_on_stack(oop object); | |
275 void add_jni_locked_monitor(oop object) { _jni_locked_monitors->append(object); } | |
276 }; | |
277 | |
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278 // StackFrameInfo for keeping Method* and bci during |
0 | 279 // stack walking for later construction of StackTraceElement[] |
280 // Java instances | |
6197 | 281 class StackFrameInfo : public CHeapObj<mtInternal> { |
0 | 282 private: |
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283 Method* _method; |
0 | 284 int _bci; |
285 GrowableArray<oop>* _locked_monitors; // list of object monitors locked by this frame | |
13391 | 286 // We need to save the mirrors in the backtrace to keep the class |
287 // from being unloaded while we still have this stack trace. | |
288 oop _class_holder; | |
0 | 289 |
290 public: | |
291 | |
292 StackFrameInfo(javaVFrame* jvf, bool with_locked_monitors); | |
293 ~StackFrameInfo() { | |
294 if (_locked_monitors != NULL) { | |
295 delete _locked_monitors; | |
296 } | |
297 }; | |
13391 | 298 Method* method() const { return _method; } |
0 | 299 int bci() const { return _bci; } |
300 void oops_do(OopClosure* f); | |
13391 | 301 void metadata_do(void f(Metadata*)); |
0 | 302 |
303 int num_locked_monitors() { return (_locked_monitors != NULL ? _locked_monitors->length() : 0); } | |
304 GrowableArray<oop>* locked_monitors() { return _locked_monitors; } | |
305 | |
306 void print_on(outputStream* st) const; | |
307 }; | |
308 | |
6197 | 309 class ThreadConcurrentLocks : public CHeapObj<mtInternal> { |
0 | 310 private: |
311 GrowableArray<instanceOop>* _owned_locks; | |
312 ThreadConcurrentLocks* _next; | |
313 JavaThread* _thread; | |
314 public: | |
315 ThreadConcurrentLocks(JavaThread* thread); | |
316 ~ThreadConcurrentLocks(); | |
317 | |
318 void add_lock(instanceOop o); | |
319 void set_next(ThreadConcurrentLocks* n) { _next = n; } | |
320 ThreadConcurrentLocks* next() { return _next; } | |
321 JavaThread* java_thread() { return _thread; } | |
322 GrowableArray<instanceOop>* owned_locks() { return _owned_locks; } | |
323 void oops_do(OopClosure* f); | |
324 }; | |
325 | |
326 class ConcurrentLocksDump : public StackObj { | |
327 private: | |
328 ThreadConcurrentLocks* _map; | |
329 ThreadConcurrentLocks* _last; // Last ThreadConcurrentLocks in the map | |
330 bool _retain_map_on_free; | |
331 | |
332 void build_map(GrowableArray<oop>* aos_objects); | |
333 void add_lock(JavaThread* thread, instanceOop o); | |
334 | |
335 public: | |
336 ConcurrentLocksDump(bool retain_map_on_free) : _map(NULL), _last(NULL), _retain_map_on_free(retain_map_on_free) {}; | |
337 ConcurrentLocksDump() : _map(NULL), _last(NULL), _retain_map_on_free(false) {}; | |
338 ~ConcurrentLocksDump(); | |
339 | |
340 void dump_at_safepoint(); | |
341 ThreadConcurrentLocks* thread_concurrent_locks(JavaThread* thread); | |
342 void print_locks_on(JavaThread* t, outputStream* st); | |
343 }; | |
344 | |
345 class ThreadDumpResult : public StackObj { | |
346 private: | |
347 int _num_threads; | |
348 int _num_snapshots; | |
349 ThreadSnapshot* _snapshots; | |
350 ThreadSnapshot* _last; | |
351 ThreadDumpResult* _next; | |
352 public: | |
353 ThreadDumpResult(); | |
354 ThreadDumpResult(int num_threads); | |
355 ~ThreadDumpResult(); | |
356 | |
357 void add_thread_snapshot(ThreadSnapshot* ts); | |
358 void set_next(ThreadDumpResult* next) { _next = next; } | |
359 ThreadDumpResult* next() { return _next; } | |
360 int num_threads() { return _num_threads; } | |
361 int num_snapshots() { return _num_snapshots; } | |
362 ThreadSnapshot* snapshots() { return _snapshots; } | |
363 void oops_do(OopClosure* f); | |
13391 | 364 void metadata_do(void f(Metadata*)); |
0 | 365 }; |
366 | |
6197 | 367 class DeadlockCycle : public CHeapObj<mtInternal> { |
0 | 368 private: |
369 bool _is_deadlock; | |
370 GrowableArray<JavaThread*>* _threads; | |
371 DeadlockCycle* _next; | |
372 public: | |
373 DeadlockCycle(); | |
374 ~DeadlockCycle(); | |
375 | |
376 DeadlockCycle* next() { return _next; } | |
377 void set_next(DeadlockCycle* d) { _next = d; } | |
378 void add_thread(JavaThread* t) { _threads->append(t); } | |
379 void reset() { _is_deadlock = false; _threads->clear(); } | |
380 void set_deadlock(bool value) { _is_deadlock = value; } | |
381 bool is_deadlock() { return _is_deadlock; } | |
382 int num_threads() { return _threads->length(); } | |
383 GrowableArray<JavaThread*>* threads() { return _threads; } | |
384 void print_on(outputStream* st) const; | |
385 }; | |
386 | |
387 // Utility class to get list of java threads. | |
388 class ThreadsListEnumerator : public StackObj { | |
389 private: | |
390 GrowableArray<instanceHandle>* _threads_array; | |
391 public: | |
392 ThreadsListEnumerator(Thread* cur_thread, | |
393 bool include_jvmti_agent_threads = false, | |
394 bool include_jni_attaching_threads = true); | |
395 int num_threads() { return _threads_array->length(); } | |
396 instanceHandle get_threadObj(int index) { return _threads_array->at(index); } | |
397 }; | |
398 | |
399 | |
400 // abstract utility class to set new thread states, and restore previous after the block exits | |
401 class JavaThreadStatusChanger : public StackObj { | |
402 private: | |
403 java_lang_Thread::ThreadStatus _old_state; | |
404 JavaThread* _java_thread; | |
405 bool _is_alive; | |
406 | |
407 void save_old_state(JavaThread* java_thread) { | |
408 _java_thread = java_thread; | |
409 _is_alive = is_alive(java_thread); | |
410 if (is_alive()) { | |
411 _old_state = java_lang_Thread::get_thread_status(_java_thread->threadObj()); | |
412 } | |
413 } | |
414 | |
415 public: | |
416 static void set_thread_status(JavaThread* java_thread, | |
417 java_lang_Thread::ThreadStatus state) { | |
418 java_lang_Thread::set_thread_status(java_thread->threadObj(), state); | |
419 } | |
420 | |
421 void set_thread_status(java_lang_Thread::ThreadStatus state) { | |
422 if (is_alive()) { | |
423 set_thread_status(_java_thread, state); | |
424 } | |
425 } | |
426 | |
427 JavaThreadStatusChanger(JavaThread* java_thread, | |
428 java_lang_Thread::ThreadStatus state) { | |
429 save_old_state(java_thread); | |
430 set_thread_status(state); | |
431 } | |
432 | |
433 JavaThreadStatusChanger(JavaThread* java_thread) { | |
434 save_old_state(java_thread); | |
435 } | |
436 | |
437 ~JavaThreadStatusChanger() { | |
438 set_thread_status(_old_state); | |
439 } | |
440 | |
441 static bool is_alive(JavaThread* java_thread) { | |
442 return java_thread != NULL && java_thread->threadObj() != NULL; | |
443 } | |
444 | |
445 bool is_alive() { | |
446 return _is_alive; | |
447 } | |
448 }; | |
449 | |
450 // Change status to waiting on an object (timed or indefinite) | |
451 class JavaThreadInObjectWaitState : public JavaThreadStatusChanger { | |
452 private: | |
453 ThreadStatistics* _stat; | |
454 bool _active; | |
455 | |
456 public: | |
457 JavaThreadInObjectWaitState(JavaThread *java_thread, bool timed) : | |
458 JavaThreadStatusChanger(java_thread, | |
459 timed ? java_lang_Thread::IN_OBJECT_WAIT_TIMED : java_lang_Thread::IN_OBJECT_WAIT) { | |
460 if (is_alive()) { | |
461 _stat = java_thread->get_thread_stat(); | |
462 _active = ThreadService::is_thread_monitoring_contention(); | |
463 _stat->monitor_wait(); | |
464 if (_active) { | |
465 _stat->monitor_wait_begin(); | |
466 } | |
467 } else { | |
468 _active = false; | |
469 } | |
470 } | |
471 | |
472 ~JavaThreadInObjectWaitState() { | |
473 if (_active) { | |
474 _stat->monitor_wait_end(); | |
475 } | |
476 } | |
477 }; | |
478 | |
479 // Change status to parked (timed or indefinite) | |
480 class JavaThreadParkedState : public JavaThreadStatusChanger { | |
481 private: | |
482 ThreadStatistics* _stat; | |
483 bool _active; | |
484 | |
485 public: | |
486 JavaThreadParkedState(JavaThread *java_thread, bool timed) : | |
487 JavaThreadStatusChanger(java_thread, | |
488 timed ? java_lang_Thread::PARKED_TIMED : java_lang_Thread::PARKED) { | |
489 if (is_alive()) { | |
490 _stat = java_thread->get_thread_stat(); | |
491 _active = ThreadService::is_thread_monitoring_contention(); | |
492 _stat->monitor_wait(); | |
493 if (_active) { | |
494 _stat->monitor_wait_begin(); | |
495 } | |
496 } else { | |
497 _active = false; | |
498 } | |
499 } | |
500 | |
501 ~JavaThreadParkedState() { | |
502 if (_active) { | |
503 _stat->monitor_wait_end(); | |
504 } | |
505 } | |
506 }; | |
507 | |
508 // Change status to blocked on (re-)entering a synchronization block | |
509 class JavaThreadBlockedOnMonitorEnterState : public JavaThreadStatusChanger { | |
510 private: | |
511 ThreadStatistics* _stat; | |
512 bool _active; | |
513 | |
514 static bool contended_enter_begin(JavaThread *java_thread) { | |
515 set_thread_status(java_thread, java_lang_Thread::BLOCKED_ON_MONITOR_ENTER); | |
516 ThreadStatistics* stat = java_thread->get_thread_stat(); | |
517 stat->contended_enter(); | |
518 bool active = ThreadService::is_thread_monitoring_contention(); | |
519 if (active) { | |
520 stat->contended_enter_begin(); | |
521 } | |
522 return active; | |
523 } | |
524 | |
525 public: | |
526 // java_thread is waiting thread being blocked on monitor reenter. | |
527 // Current thread is the notifying thread which holds the monitor. | |
528 static bool wait_reenter_begin(JavaThread *java_thread, ObjectMonitor *obj_m) { | |
529 assert((java_thread != NULL), "Java thread should not be null here"); | |
530 bool active = false; | |
531 if (is_alive(java_thread) && ServiceUtil::visible_oop((oop)obj_m->object())) { | |
532 active = contended_enter_begin(java_thread); | |
533 } | |
534 return active; | |
535 } | |
536 | |
537 static void wait_reenter_end(JavaThread *java_thread, bool active) { | |
538 if (active) { | |
539 java_thread->get_thread_stat()->contended_enter_end(); | |
540 } | |
541 set_thread_status(java_thread, java_lang_Thread::RUNNABLE); | |
542 } | |
543 | |
544 JavaThreadBlockedOnMonitorEnterState(JavaThread *java_thread, ObjectMonitor *obj_m) : | |
545 JavaThreadStatusChanger(java_thread) { | |
546 assert((java_thread != NULL), "Java thread should not be null here"); | |
547 // Change thread status and collect contended enter stats for monitor contended | |
548 // enter done for external java world objects and it is contended. All other cases | |
549 // like for vm internal objects and for external objects which are not contended | |
550 // thread status is not changed and contended enter stat is not collected. | |
551 _active = false; | |
552 if (is_alive() && ServiceUtil::visible_oop((oop)obj_m->object()) && obj_m->contentions() > 0) { | |
553 _stat = java_thread->get_thread_stat(); | |
554 _active = contended_enter_begin(java_thread); | |
555 } | |
556 } | |
557 | |
558 ~JavaThreadBlockedOnMonitorEnterState() { | |
559 if (_active) { | |
560 _stat->contended_enter_end(); | |
561 } | |
562 } | |
563 }; | |
564 | |
565 // Change status to sleeping | |
566 class JavaThreadSleepState : public JavaThreadStatusChanger { | |
567 private: | |
568 ThreadStatistics* _stat; | |
569 bool _active; | |
570 public: | |
571 JavaThreadSleepState(JavaThread *java_thread) : | |
572 JavaThreadStatusChanger(java_thread, java_lang_Thread::SLEEPING) { | |
573 if (is_alive()) { | |
574 _stat = java_thread->get_thread_stat(); | |
575 _active = ThreadService::is_thread_monitoring_contention(); | |
576 _stat->thread_sleep(); | |
577 if (_active) { | |
578 _stat->thread_sleep_begin(); | |
579 } | |
580 } else { | |
581 _active = false; | |
582 } | |
583 } | |
584 | |
585 ~JavaThreadSleepState() { | |
586 if (_active) { | |
587 _stat->thread_sleep_end(); | |
588 } | |
589 } | |
590 }; | |
1972 | 591 |
592 #endif // SHARE_VM_SERVICES_THREADSERVICE_HPP |