Mercurial > hg > truffle
annotate src/share/vm/services/threadService.hpp @ 1294:7de45b5044c3
6932270: Allow Java's ELF symtab reader to use separate debuginfo files
Reviewed-by: never
Contributed-by: Andrew Haley <aph@redhat.com>
author | never |
---|---|
date | Tue, 09 Mar 2010 11:02:39 -0800 |
parents | 89e0543e1737 |
children | c18cbe5936b8 |
rev | line source |
---|---|
0 | 1 /* |
948 | 2 * Copyright 2003-2009 Sun Microsystems, Inc. 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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 class OopClosure; | |
26 class ThreadDumpResult; | |
27 class ThreadStackTrace; | |
28 class ThreadSnapshot; | |
29 class StackFrameInfo; | |
30 class ThreadConcurrentLocks; | |
31 class DeadlockCycle; | |
32 | |
33 // VM monitoring and management support for the thread and | |
34 // synchronization subsystem | |
35 // | |
36 // Thread contention monitoring is disabled by default. | |
37 // When enabled, the VM will begin measuring the accumulated | |
38 // elapsed time a thread blocked on synchronization. | |
39 // | |
40 class ThreadService : public AllStatic { | |
41 private: | |
42 // These counters could be moved to Threads class | |
43 static PerfCounter* _total_threads_count; | |
44 static PerfVariable* _live_threads_count; | |
45 static PerfVariable* _peak_threads_count; | |
46 static PerfVariable* _daemon_threads_count; | |
47 | |
48 // These 2 counters are atomically incremented once the thread is exiting. | |
49 // They will be atomically decremented when ThreadService::remove_thread is called. | |
50 static volatile int _exiting_threads_count; | |
51 static volatile int _exiting_daemon_threads_count; | |
52 | |
53 static bool _thread_monitoring_contention_enabled; | |
54 static bool _thread_cpu_time_enabled; | |
55 | |
56 // Need to keep the list of thread dump result that | |
57 // keep references to methodOop since thread dump can be | |
58 // requested by multiple threads concurrently. | |
59 static ThreadDumpResult* _threaddump_list; | |
60 | |
61 public: | |
62 static void init(); | |
63 static void add_thread(JavaThread* thread, bool daemon); | |
64 static void remove_thread(JavaThread* thread, bool daemon); | |
65 static void current_thread_exiting(JavaThread* jt); | |
66 | |
67 static bool set_thread_monitoring_contention(bool flag); | |
68 static bool is_thread_monitoring_contention() { return _thread_monitoring_contention_enabled; } | |
69 | |
70 static bool set_thread_cpu_time_enabled(bool flag); | |
71 static bool is_thread_cpu_time_enabled() { return _thread_cpu_time_enabled; } | |
72 | |
73 static jlong get_total_thread_count() { return _total_threads_count->get_value(); } | |
74 static jlong get_peak_thread_count() { return _peak_threads_count->get_value(); } | |
75 static jlong get_live_thread_count() { return _live_threads_count->get_value() - _exiting_threads_count; } | |
76 static jlong get_daemon_thread_count() { return _daemon_threads_count->get_value() - _exiting_daemon_threads_count; } | |
77 | |
78 static int exiting_threads_count() { return _exiting_threads_count; } | |
79 static int exiting_daemon_threads_count() { return _exiting_daemon_threads_count; } | |
80 | |
81 // Support for thread dump | |
82 static void add_thread_dump(ThreadDumpResult* dump); | |
83 static void remove_thread_dump(ThreadDumpResult* dump); | |
84 | |
85 static Handle get_current_contended_monitor(JavaThread* thread); | |
86 | |
87 // This function is called by JVM_DumpThreads. | |
88 static Handle dump_stack_traces(GrowableArray<instanceHandle>* threads, | |
89 int num_threads, TRAPS); | |
90 | |
91 static void reset_peak_thread_count(); | |
92 static void reset_contention_count_stat(JavaThread* thread); | |
93 static void reset_contention_time_stat(JavaThread* thread); | |
94 | |
95 static DeadlockCycle* find_deadlocks_at_safepoint(bool object_monitors_only); | |
96 | |
97 // GC support | |
98 static void oops_do(OopClosure* f); | |
99 }; | |
100 | |
101 // Per-thread Statistics for synchronization | |
102 class ThreadStatistics : public CHeapObj { | |
103 private: | |
104 // The following contention statistics are only updated by | |
105 // the thread owning these statistics when contention occurs. | |
106 | |
107 jlong _contended_enter_count; | |
108 elapsedTimer _contended_enter_timer; | |
109 jlong _monitor_wait_count; | |
110 elapsedTimer _monitor_wait_timer; | |
111 jlong _sleep_count; | |
112 elapsedTimer _sleep_timer; | |
113 | |
114 | |
115 // These two reset flags are set to true when another thread | |
116 // requests to reset the statistics. The actual statistics | |
117 // are reset when the thread contention occurs and attempts | |
118 // to update the statistics. | |
119 bool _count_pending_reset; | |
120 bool _timer_pending_reset; | |
121 | |
122 // Keep accurate times for potentially recursive class operations | |
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123 int _perf_recursion_counts[6]; |
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124 elapsedTimer _perf_timers[6]; |
0 | 125 |
126 // utility functions | |
127 void check_and_reset_count() { | |
128 if (!_count_pending_reset) return; | |
129 _contended_enter_count = 0; | |
130 _monitor_wait_count = 0; | |
131 _sleep_count = 0; | |
132 _count_pending_reset = 0; | |
133 } | |
134 void check_and_reset_timer() { | |
135 if (!_timer_pending_reset) return; | |
136 _contended_enter_timer.reset(); | |
137 _monitor_wait_timer.reset(); | |
138 _sleep_timer.reset(); | |
139 _timer_pending_reset = 0; | |
140 } | |
141 | |
142 public: | |
143 ThreadStatistics(); | |
144 | |
145 jlong contended_enter_count() { return (_count_pending_reset ? 0 : _contended_enter_count); } | |
146 jlong contended_enter_ticks() { return (_timer_pending_reset ? 0 : _contended_enter_timer.active_ticks()); } | |
147 jlong monitor_wait_count() { return (_count_pending_reset ? 0 : _monitor_wait_count); } | |
148 jlong monitor_wait_ticks() { return (_timer_pending_reset ? 0 : _monitor_wait_timer.active_ticks()); } | |
149 jlong sleep_count() { return (_count_pending_reset ? 0 : _sleep_count); } | |
150 jlong sleep_ticks() { return (_timer_pending_reset ? 0 : _sleep_timer.active_ticks()); } | |
151 | |
152 void monitor_wait() { check_and_reset_count(); _monitor_wait_count++; } | |
153 void monitor_wait_begin() { check_and_reset_timer(); _monitor_wait_timer.start(); } | |
154 void monitor_wait_end() { _monitor_wait_timer.stop(); check_and_reset_timer(); } | |
155 | |
156 void thread_sleep() { check_and_reset_count(); _sleep_count++; } | |
157 void thread_sleep_begin() { check_and_reset_timer(); _sleep_timer.start(); } | |
158 void thread_sleep_end() { _sleep_timer.stop(); check_and_reset_timer(); } | |
159 | |
160 void contended_enter() { check_and_reset_count(); _contended_enter_count++; } | |
161 void contended_enter_begin() { check_and_reset_timer(); _contended_enter_timer.start(); } | |
162 void contended_enter_end() { _contended_enter_timer.stop(); check_and_reset_timer(); } | |
163 | |
164 void reset_count_stat() { _count_pending_reset = true; } | |
165 void reset_time_stat() { _timer_pending_reset = true; } | |
166 | |
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167 int* perf_recursion_counts_addr() { return _perf_recursion_counts; } |
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168 elapsedTimer* perf_timers_addr() { return _perf_timers; } |
0 | 169 }; |
170 | |
171 // Thread snapshot to represent the thread state and statistics | |
172 class ThreadSnapshot : public CHeapObj { | |
173 private: | |
174 JavaThread* _thread; | |
175 oop _threadObj; | |
176 java_lang_Thread::ThreadStatus _thread_status; | |
177 | |
178 bool _is_ext_suspended; | |
179 bool _is_in_native; | |
180 | |
181 jlong _contended_enter_ticks; | |
182 jlong _contended_enter_count; | |
183 jlong _monitor_wait_ticks; | |
184 jlong _monitor_wait_count; | |
185 jlong _sleep_ticks; | |
186 jlong _sleep_count; | |
187 oop _blocker_object; | |
188 oop _blocker_object_owner; | |
189 | |
190 ThreadStackTrace* _stack_trace; | |
191 ThreadConcurrentLocks* _concurrent_locks; | |
192 ThreadSnapshot* _next; | |
193 | |
194 public: | |
195 // Dummy snapshot | |
196 ThreadSnapshot() : _thread(NULL), _threadObj(NULL), _stack_trace(NULL), _concurrent_locks(NULL), _next(NULL), | |
197 _blocker_object(NULL), _blocker_object_owner(NULL) {}; | |
198 ThreadSnapshot(JavaThread* thread); | |
199 ~ThreadSnapshot(); | |
200 | |
201 java_lang_Thread::ThreadStatus thread_status() { return _thread_status; } | |
202 | |
203 oop threadObj() const { return _threadObj; } | |
204 | |
205 void set_next(ThreadSnapshot* n) { _next = n; } | |
206 | |
207 bool is_ext_suspended() { return _is_ext_suspended; } | |
208 bool is_in_native() { return _is_in_native; } | |
209 | |
210 jlong contended_enter_count() { return _contended_enter_count; } | |
211 jlong contended_enter_ticks() { return _contended_enter_ticks; } | |
212 jlong monitor_wait_count() { return _monitor_wait_count; } | |
213 jlong monitor_wait_ticks() { return _monitor_wait_ticks; } | |
214 jlong sleep_count() { return _sleep_count; } | |
215 jlong sleep_ticks() { return _sleep_ticks; } | |
216 | |
217 | |
218 oop blocker_object() { return _blocker_object; } | |
219 oop blocker_object_owner() { return _blocker_object_owner; } | |
220 | |
221 ThreadSnapshot* next() const { return _next; } | |
222 ThreadStackTrace* get_stack_trace() { return _stack_trace; } | |
223 ThreadConcurrentLocks* get_concurrent_locks() { return _concurrent_locks; } | |
224 | |
225 void dump_stack_at_safepoint(int max_depth, bool with_locked_monitors); | |
226 void set_concurrent_locks(ThreadConcurrentLocks* l) { _concurrent_locks = l; } | |
227 void oops_do(OopClosure* f); | |
228 }; | |
229 | |
230 class ThreadStackTrace : public CHeapObj { | |
231 private: | |
232 JavaThread* _thread; | |
233 int _depth; // number of stack frames added | |
234 bool _with_locked_monitors; | |
235 GrowableArray<StackFrameInfo*>* _frames; | |
236 GrowableArray<oop>* _jni_locked_monitors; | |
237 | |
238 public: | |
239 | |
240 ThreadStackTrace(JavaThread* thread, bool with_locked_monitors); | |
241 ~ThreadStackTrace(); | |
242 | |
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243 JavaThread* thread() { return _thread; } |
0 | 244 StackFrameInfo* stack_frame_at(int i) { return _frames->at(i); } |
245 int get_stack_depth() { return _depth; } | |
246 | |
247 void add_stack_frame(javaVFrame* jvf); | |
248 void dump_stack_at_safepoint(int max_depth); | |
249 Handle allocate_fill_stack_trace_element_array(TRAPS); | |
250 void oops_do(OopClosure* f); | |
251 GrowableArray<oop>* jni_locked_monitors() { return _jni_locked_monitors; } | |
252 int num_jni_locked_monitors() { return (_jni_locked_monitors != NULL ? _jni_locked_monitors->length() : 0); } | |
253 | |
254 bool is_owned_monitor_on_stack(oop object); | |
255 void add_jni_locked_monitor(oop object) { _jni_locked_monitors->append(object); } | |
256 }; | |
257 | |
258 // StackFrameInfo for keeping methodOop and bci during | |
259 // stack walking for later construction of StackTraceElement[] | |
260 // Java instances | |
261 class StackFrameInfo : public CHeapObj { | |
262 private: | |
263 methodOop _method; | |
264 int _bci; | |
265 GrowableArray<oop>* _locked_monitors; // list of object monitors locked by this frame | |
266 | |
267 public: | |
268 | |
269 StackFrameInfo(javaVFrame* jvf, bool with_locked_monitors); | |
270 ~StackFrameInfo() { | |
271 if (_locked_monitors != NULL) { | |
272 delete _locked_monitors; | |
273 } | |
274 }; | |
275 methodOop method() const { return _method; } | |
276 int bci() const { return _bci; } | |
277 void oops_do(OopClosure* f); | |
278 | |
279 int num_locked_monitors() { return (_locked_monitors != NULL ? _locked_monitors->length() : 0); } | |
280 GrowableArray<oop>* locked_monitors() { return _locked_monitors; } | |
281 | |
282 void print_on(outputStream* st) const; | |
283 }; | |
284 | |
285 class ThreadConcurrentLocks : public CHeapObj { | |
286 private: | |
287 GrowableArray<instanceOop>* _owned_locks; | |
288 ThreadConcurrentLocks* _next; | |
289 JavaThread* _thread; | |
290 public: | |
291 ThreadConcurrentLocks(JavaThread* thread); | |
292 ~ThreadConcurrentLocks(); | |
293 | |
294 void add_lock(instanceOop o); | |
295 void set_next(ThreadConcurrentLocks* n) { _next = n; } | |
296 ThreadConcurrentLocks* next() { return _next; } | |
297 JavaThread* java_thread() { return _thread; } | |
298 GrowableArray<instanceOop>* owned_locks() { return _owned_locks; } | |
299 void oops_do(OopClosure* f); | |
300 }; | |
301 | |
302 class ConcurrentLocksDump : public StackObj { | |
303 private: | |
304 ThreadConcurrentLocks* _map; | |
305 ThreadConcurrentLocks* _last; // Last ThreadConcurrentLocks in the map | |
306 bool _retain_map_on_free; | |
307 | |
308 void build_map(GrowableArray<oop>* aos_objects); | |
309 void add_lock(JavaThread* thread, instanceOop o); | |
310 | |
311 public: | |
312 ConcurrentLocksDump(bool retain_map_on_free) : _map(NULL), _last(NULL), _retain_map_on_free(retain_map_on_free) {}; | |
313 ConcurrentLocksDump() : _map(NULL), _last(NULL), _retain_map_on_free(false) {}; | |
314 ~ConcurrentLocksDump(); | |
315 | |
316 void dump_at_safepoint(); | |
317 ThreadConcurrentLocks* thread_concurrent_locks(JavaThread* thread); | |
318 void print_locks_on(JavaThread* t, outputStream* st); | |
319 }; | |
320 | |
321 class ThreadDumpResult : public StackObj { | |
322 private: | |
323 int _num_threads; | |
324 int _num_snapshots; | |
325 ThreadSnapshot* _snapshots; | |
326 ThreadSnapshot* _last; | |
327 ThreadDumpResult* _next; | |
328 public: | |
329 ThreadDumpResult(); | |
330 ThreadDumpResult(int num_threads); | |
331 ~ThreadDumpResult(); | |
332 | |
333 void add_thread_snapshot(ThreadSnapshot* ts); | |
334 void set_next(ThreadDumpResult* next) { _next = next; } | |
335 ThreadDumpResult* next() { return _next; } | |
336 int num_threads() { return _num_threads; } | |
337 int num_snapshots() { return _num_snapshots; } | |
338 ThreadSnapshot* snapshots() { return _snapshots; } | |
339 void oops_do(OopClosure* f); | |
340 }; | |
341 | |
342 class DeadlockCycle : public CHeapObj { | |
343 private: | |
344 bool _is_deadlock; | |
345 GrowableArray<JavaThread*>* _threads; | |
346 DeadlockCycle* _next; | |
347 public: | |
348 DeadlockCycle(); | |
349 ~DeadlockCycle(); | |
350 | |
351 DeadlockCycle* next() { return _next; } | |
352 void set_next(DeadlockCycle* d) { _next = d; } | |
353 void add_thread(JavaThread* t) { _threads->append(t); } | |
354 void reset() { _is_deadlock = false; _threads->clear(); } | |
355 void set_deadlock(bool value) { _is_deadlock = value; } | |
356 bool is_deadlock() { return _is_deadlock; } | |
357 int num_threads() { return _threads->length(); } | |
358 GrowableArray<JavaThread*>* threads() { return _threads; } | |
359 void print_on(outputStream* st) const; | |
360 }; | |
361 | |
362 // Utility class to get list of java threads. | |
363 class ThreadsListEnumerator : public StackObj { | |
364 private: | |
365 GrowableArray<instanceHandle>* _threads_array; | |
366 public: | |
367 ThreadsListEnumerator(Thread* cur_thread, | |
368 bool include_jvmti_agent_threads = false, | |
369 bool include_jni_attaching_threads = true); | |
370 int num_threads() { return _threads_array->length(); } | |
371 instanceHandle get_threadObj(int index) { return _threads_array->at(index); } | |
372 }; | |
373 | |
374 | |
375 // abstract utility class to set new thread states, and restore previous after the block exits | |
376 class JavaThreadStatusChanger : public StackObj { | |
377 private: | |
378 java_lang_Thread::ThreadStatus _old_state; | |
379 JavaThread* _java_thread; | |
380 bool _is_alive; | |
381 | |
382 void save_old_state(JavaThread* java_thread) { | |
383 _java_thread = java_thread; | |
384 _is_alive = is_alive(java_thread); | |
385 if (is_alive()) { | |
386 _old_state = java_lang_Thread::get_thread_status(_java_thread->threadObj()); | |
387 } | |
388 } | |
389 | |
390 public: | |
391 static void set_thread_status(JavaThread* java_thread, | |
392 java_lang_Thread::ThreadStatus state) { | |
393 java_lang_Thread::set_thread_status(java_thread->threadObj(), state); | |
394 } | |
395 | |
396 void set_thread_status(java_lang_Thread::ThreadStatus state) { | |
397 if (is_alive()) { | |
398 set_thread_status(_java_thread, state); | |
399 } | |
400 } | |
401 | |
402 JavaThreadStatusChanger(JavaThread* java_thread, | |
403 java_lang_Thread::ThreadStatus state) { | |
404 save_old_state(java_thread); | |
405 set_thread_status(state); | |
406 } | |
407 | |
408 JavaThreadStatusChanger(JavaThread* java_thread) { | |
409 save_old_state(java_thread); | |
410 } | |
411 | |
412 ~JavaThreadStatusChanger() { | |
413 set_thread_status(_old_state); | |
414 } | |
415 | |
416 static bool is_alive(JavaThread* java_thread) { | |
417 return java_thread != NULL && java_thread->threadObj() != NULL; | |
418 } | |
419 | |
420 bool is_alive() { | |
421 return _is_alive; | |
422 } | |
423 }; | |
424 | |
425 // Change status to waiting on an object (timed or indefinite) | |
426 class JavaThreadInObjectWaitState : public JavaThreadStatusChanger { | |
427 private: | |
428 ThreadStatistics* _stat; | |
429 bool _active; | |
430 | |
431 public: | |
432 JavaThreadInObjectWaitState(JavaThread *java_thread, bool timed) : | |
433 JavaThreadStatusChanger(java_thread, | |
434 timed ? java_lang_Thread::IN_OBJECT_WAIT_TIMED : java_lang_Thread::IN_OBJECT_WAIT) { | |
435 if (is_alive()) { | |
436 _stat = java_thread->get_thread_stat(); | |
437 _active = ThreadService::is_thread_monitoring_contention(); | |
438 _stat->monitor_wait(); | |
439 if (_active) { | |
440 _stat->monitor_wait_begin(); | |
441 } | |
442 } else { | |
443 _active = false; | |
444 } | |
445 } | |
446 | |
447 ~JavaThreadInObjectWaitState() { | |
448 if (_active) { | |
449 _stat->monitor_wait_end(); | |
450 } | |
451 } | |
452 }; | |
453 | |
454 // Change status to parked (timed or indefinite) | |
455 class JavaThreadParkedState : public JavaThreadStatusChanger { | |
456 private: | |
457 ThreadStatistics* _stat; | |
458 bool _active; | |
459 | |
460 public: | |
461 JavaThreadParkedState(JavaThread *java_thread, bool timed) : | |
462 JavaThreadStatusChanger(java_thread, | |
463 timed ? java_lang_Thread::PARKED_TIMED : java_lang_Thread::PARKED) { | |
464 if (is_alive()) { | |
465 _stat = java_thread->get_thread_stat(); | |
466 _active = ThreadService::is_thread_monitoring_contention(); | |
467 _stat->monitor_wait(); | |
468 if (_active) { | |
469 _stat->monitor_wait_begin(); | |
470 } | |
471 } else { | |
472 _active = false; | |
473 } | |
474 } | |
475 | |
476 ~JavaThreadParkedState() { | |
477 if (_active) { | |
478 _stat->monitor_wait_end(); | |
479 } | |
480 } | |
481 }; | |
482 | |
483 // Change status to blocked on (re-)entering a synchronization block | |
484 class JavaThreadBlockedOnMonitorEnterState : public JavaThreadStatusChanger { | |
485 private: | |
486 ThreadStatistics* _stat; | |
487 bool _active; | |
488 | |
489 static bool contended_enter_begin(JavaThread *java_thread) { | |
490 set_thread_status(java_thread, java_lang_Thread::BLOCKED_ON_MONITOR_ENTER); | |
491 ThreadStatistics* stat = java_thread->get_thread_stat(); | |
492 stat->contended_enter(); | |
493 bool active = ThreadService::is_thread_monitoring_contention(); | |
494 if (active) { | |
495 stat->contended_enter_begin(); | |
496 } | |
497 return active; | |
498 } | |
499 | |
500 public: | |
501 // java_thread is waiting thread being blocked on monitor reenter. | |
502 // Current thread is the notifying thread which holds the monitor. | |
503 static bool wait_reenter_begin(JavaThread *java_thread, ObjectMonitor *obj_m) { | |
504 assert((java_thread != NULL), "Java thread should not be null here"); | |
505 bool active = false; | |
506 if (is_alive(java_thread) && ServiceUtil::visible_oop((oop)obj_m->object())) { | |
507 active = contended_enter_begin(java_thread); | |
508 } | |
509 return active; | |
510 } | |
511 | |
512 static void wait_reenter_end(JavaThread *java_thread, bool active) { | |
513 if (active) { | |
514 java_thread->get_thread_stat()->contended_enter_end(); | |
515 } | |
516 set_thread_status(java_thread, java_lang_Thread::RUNNABLE); | |
517 } | |
518 | |
519 JavaThreadBlockedOnMonitorEnterState(JavaThread *java_thread, ObjectMonitor *obj_m) : | |
520 JavaThreadStatusChanger(java_thread) { | |
521 assert((java_thread != NULL), "Java thread should not be null here"); | |
522 // Change thread status and collect contended enter stats for monitor contended | |
523 // enter done for external java world objects and it is contended. All other cases | |
524 // like for vm internal objects and for external objects which are not contended | |
525 // thread status is not changed and contended enter stat is not collected. | |
526 _active = false; | |
527 if (is_alive() && ServiceUtil::visible_oop((oop)obj_m->object()) && obj_m->contentions() > 0) { | |
528 _stat = java_thread->get_thread_stat(); | |
529 _active = contended_enter_begin(java_thread); | |
530 } | |
531 } | |
532 | |
533 ~JavaThreadBlockedOnMonitorEnterState() { | |
534 if (_active) { | |
535 _stat->contended_enter_end(); | |
536 } | |
537 } | |
538 }; | |
539 | |
540 // Change status to sleeping | |
541 class JavaThreadSleepState : public JavaThreadStatusChanger { | |
542 private: | |
543 ThreadStatistics* _stat; | |
544 bool _active; | |
545 public: | |
546 JavaThreadSleepState(JavaThread *java_thread) : | |
547 JavaThreadStatusChanger(java_thread, java_lang_Thread::SLEEPING) { | |
548 if (is_alive()) { | |
549 _stat = java_thread->get_thread_stat(); | |
550 _active = ThreadService::is_thread_monitoring_contention(); | |
551 _stat->thread_sleep(); | |
552 if (_active) { | |
553 _stat->thread_sleep_begin(); | |
554 } | |
555 } else { | |
556 _active = false; | |
557 } | |
558 } | |
559 | |
560 ~JavaThreadSleepState() { | |
561 if (_active) { | |
562 _stat->thread_sleep_end(); | |
563 } | |
564 } | |
565 }; |