Mercurial > hg > graal-jvmci-8
annotate src/share/vm/services/threadService.hpp @ 2022:2d4762ec74af
7003748: Decode C stack frames when symbols are presented (PhoneHome project)
Summary: Implemented in-process C native stack frame decoding when symbols are available.
Reviewed-by: coleenp, never
author | zgu |
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date | Sat, 11 Dec 2010 13:20:56 -0500 |
parents | f95d63e2154a |
children | b1a2afa37ec4 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2003, 2010, 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 * | |
1552
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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; | |
68 | |
69 // Need to keep the list of thread dump result that | |
70 // keep references to methodOop since thread dump can be | |
71 // requested by multiple threads concurrently. | |
72 static ThreadDumpResult* _threaddump_list; | |
73 | |
74 public: | |
75 static void init(); | |
76 static void add_thread(JavaThread* thread, bool daemon); | |
77 static void remove_thread(JavaThread* thread, bool daemon); | |
78 static void current_thread_exiting(JavaThread* jt); | |
79 | |
80 static bool set_thread_monitoring_contention(bool flag); | |
81 static bool is_thread_monitoring_contention() { return _thread_monitoring_contention_enabled; } | |
82 | |
83 static bool set_thread_cpu_time_enabled(bool flag); | |
84 static bool is_thread_cpu_time_enabled() { return _thread_cpu_time_enabled; } | |
85 | |
86 static jlong get_total_thread_count() { return _total_threads_count->get_value(); } | |
87 static jlong get_peak_thread_count() { return _peak_threads_count->get_value(); } | |
88 static jlong get_live_thread_count() { return _live_threads_count->get_value() - _exiting_threads_count; } | |
89 static jlong get_daemon_thread_count() { return _daemon_threads_count->get_value() - _exiting_daemon_threads_count; } | |
90 | |
91 static int exiting_threads_count() { return _exiting_threads_count; } | |
92 static int exiting_daemon_threads_count() { return _exiting_daemon_threads_count; } | |
93 | |
94 // Support for thread dump | |
95 static void add_thread_dump(ThreadDumpResult* dump); | |
96 static void remove_thread_dump(ThreadDumpResult* dump); | |
97 | |
98 static Handle get_current_contended_monitor(JavaThread* thread); | |
99 | |
100 // This function is called by JVM_DumpThreads. | |
101 static Handle dump_stack_traces(GrowableArray<instanceHandle>* threads, | |
102 int num_threads, TRAPS); | |
103 | |
104 static void reset_peak_thread_count(); | |
105 static void reset_contention_count_stat(JavaThread* thread); | |
106 static void reset_contention_time_stat(JavaThread* thread); | |
107 | |
108 static DeadlockCycle* find_deadlocks_at_safepoint(bool object_monitors_only); | |
109 | |
110 // GC support | |
111 static void oops_do(OopClosure* f); | |
112 }; | |
113 | |
114 // Per-thread Statistics for synchronization | |
115 class ThreadStatistics : public CHeapObj { | |
116 private: | |
117 // The following contention statistics are only updated by | |
118 // the thread owning these statistics when contention occurs. | |
119 | |
120 jlong _contended_enter_count; | |
121 elapsedTimer _contended_enter_timer; | |
122 jlong _monitor_wait_count; | |
123 elapsedTimer _monitor_wait_timer; | |
124 jlong _sleep_count; | |
125 elapsedTimer _sleep_timer; | |
126 | |
127 | |
128 // These two reset flags are set to true when another thread | |
129 // requests to reset the statistics. The actual statistics | |
130 // are reset when the thread contention occurs and attempts | |
131 // to update the statistics. | |
132 bool _count_pending_reset; | |
133 bool _timer_pending_reset; | |
134 | |
135 // Keep accurate times for potentially recursive class operations | |
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136 int _perf_recursion_counts[6]; |
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137 elapsedTimer _perf_timers[6]; |
0 | 138 |
139 // utility functions | |
140 void check_and_reset_count() { | |
141 if (!_count_pending_reset) return; | |
142 _contended_enter_count = 0; | |
143 _monitor_wait_count = 0; | |
144 _sleep_count = 0; | |
145 _count_pending_reset = 0; | |
146 } | |
147 void check_and_reset_timer() { | |
148 if (!_timer_pending_reset) return; | |
149 _contended_enter_timer.reset(); | |
150 _monitor_wait_timer.reset(); | |
151 _sleep_timer.reset(); | |
152 _timer_pending_reset = 0; | |
153 } | |
154 | |
155 public: | |
156 ThreadStatistics(); | |
157 | |
158 jlong contended_enter_count() { return (_count_pending_reset ? 0 : _contended_enter_count); } | |
159 jlong contended_enter_ticks() { return (_timer_pending_reset ? 0 : _contended_enter_timer.active_ticks()); } | |
160 jlong monitor_wait_count() { return (_count_pending_reset ? 0 : _monitor_wait_count); } | |
161 jlong monitor_wait_ticks() { return (_timer_pending_reset ? 0 : _monitor_wait_timer.active_ticks()); } | |
162 jlong sleep_count() { return (_count_pending_reset ? 0 : _sleep_count); } | |
163 jlong sleep_ticks() { return (_timer_pending_reset ? 0 : _sleep_timer.active_ticks()); } | |
164 | |
165 void monitor_wait() { check_and_reset_count(); _monitor_wait_count++; } | |
166 void monitor_wait_begin() { check_and_reset_timer(); _monitor_wait_timer.start(); } | |
167 void monitor_wait_end() { _monitor_wait_timer.stop(); check_and_reset_timer(); } | |
168 | |
169 void thread_sleep() { check_and_reset_count(); _sleep_count++; } | |
170 void thread_sleep_begin() { check_and_reset_timer(); _sleep_timer.start(); } | |
171 void thread_sleep_end() { _sleep_timer.stop(); check_and_reset_timer(); } | |
172 | |
173 void contended_enter() { check_and_reset_count(); _contended_enter_count++; } | |
174 void contended_enter_begin() { check_and_reset_timer(); _contended_enter_timer.start(); } | |
175 void contended_enter_end() { _contended_enter_timer.stop(); check_and_reset_timer(); } | |
176 | |
177 void reset_count_stat() { _count_pending_reset = true; } | |
178 void reset_time_stat() { _timer_pending_reset = true; } | |
179 | |
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180 int* perf_recursion_counts_addr() { return _perf_recursion_counts; } |
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181 elapsedTimer* perf_timers_addr() { return _perf_timers; } |
0 | 182 }; |
183 | |
184 // Thread snapshot to represent the thread state and statistics | |
185 class ThreadSnapshot : public CHeapObj { | |
186 private: | |
187 JavaThread* _thread; | |
188 oop _threadObj; | |
189 java_lang_Thread::ThreadStatus _thread_status; | |
190 | |
191 bool _is_ext_suspended; | |
192 bool _is_in_native; | |
193 | |
194 jlong _contended_enter_ticks; | |
195 jlong _contended_enter_count; | |
196 jlong _monitor_wait_ticks; | |
197 jlong _monitor_wait_count; | |
198 jlong _sleep_ticks; | |
199 jlong _sleep_count; | |
200 oop _blocker_object; | |
201 oop _blocker_object_owner; | |
202 | |
203 ThreadStackTrace* _stack_trace; | |
204 ThreadConcurrentLocks* _concurrent_locks; | |
205 ThreadSnapshot* _next; | |
206 | |
207 public: | |
208 // Dummy snapshot | |
209 ThreadSnapshot() : _thread(NULL), _threadObj(NULL), _stack_trace(NULL), _concurrent_locks(NULL), _next(NULL), | |
210 _blocker_object(NULL), _blocker_object_owner(NULL) {}; | |
211 ThreadSnapshot(JavaThread* thread); | |
212 ~ThreadSnapshot(); | |
213 | |
214 java_lang_Thread::ThreadStatus thread_status() { return _thread_status; } | |
215 | |
216 oop threadObj() const { return _threadObj; } | |
217 | |
218 void set_next(ThreadSnapshot* n) { _next = n; } | |
219 | |
220 bool is_ext_suspended() { return _is_ext_suspended; } | |
221 bool is_in_native() { return _is_in_native; } | |
222 | |
223 jlong contended_enter_count() { return _contended_enter_count; } | |
224 jlong contended_enter_ticks() { return _contended_enter_ticks; } | |
225 jlong monitor_wait_count() { return _monitor_wait_count; } | |
226 jlong monitor_wait_ticks() { return _monitor_wait_ticks; } | |
227 jlong sleep_count() { return _sleep_count; } | |
228 jlong sleep_ticks() { return _sleep_ticks; } | |
229 | |
230 | |
231 oop blocker_object() { return _blocker_object; } | |
232 oop blocker_object_owner() { return _blocker_object_owner; } | |
233 | |
234 ThreadSnapshot* next() const { return _next; } | |
235 ThreadStackTrace* get_stack_trace() { return _stack_trace; } | |
236 ThreadConcurrentLocks* get_concurrent_locks() { return _concurrent_locks; } | |
237 | |
238 void dump_stack_at_safepoint(int max_depth, bool with_locked_monitors); | |
239 void set_concurrent_locks(ThreadConcurrentLocks* l) { _concurrent_locks = l; } | |
240 void oops_do(OopClosure* f); | |
241 }; | |
242 | |
243 class ThreadStackTrace : public CHeapObj { | |
244 private: | |
245 JavaThread* _thread; | |
246 int _depth; // number of stack frames added | |
247 bool _with_locked_monitors; | |
248 GrowableArray<StackFrameInfo*>* _frames; | |
249 GrowableArray<oop>* _jni_locked_monitors; | |
250 | |
251 public: | |
252 | |
253 ThreadStackTrace(JavaThread* thread, bool with_locked_monitors); | |
254 ~ThreadStackTrace(); | |
255 | |
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256 JavaThread* thread() { return _thread; } |
0 | 257 StackFrameInfo* stack_frame_at(int i) { return _frames->at(i); } |
258 int get_stack_depth() { return _depth; } | |
259 | |
260 void add_stack_frame(javaVFrame* jvf); | |
261 void dump_stack_at_safepoint(int max_depth); | |
262 Handle allocate_fill_stack_trace_element_array(TRAPS); | |
263 void oops_do(OopClosure* f); | |
264 GrowableArray<oop>* jni_locked_monitors() { return _jni_locked_monitors; } | |
265 int num_jni_locked_monitors() { return (_jni_locked_monitors != NULL ? _jni_locked_monitors->length() : 0); } | |
266 | |
267 bool is_owned_monitor_on_stack(oop object); | |
268 void add_jni_locked_monitor(oop object) { _jni_locked_monitors->append(object); } | |
269 }; | |
270 | |
271 // StackFrameInfo for keeping methodOop and bci during | |
272 // stack walking for later construction of StackTraceElement[] | |
273 // Java instances | |
274 class StackFrameInfo : public CHeapObj { | |
275 private: | |
276 methodOop _method; | |
277 int _bci; | |
278 GrowableArray<oop>* _locked_monitors; // list of object monitors locked by this frame | |
279 | |
280 public: | |
281 | |
282 StackFrameInfo(javaVFrame* jvf, bool with_locked_monitors); | |
283 ~StackFrameInfo() { | |
284 if (_locked_monitors != NULL) { | |
285 delete _locked_monitors; | |
286 } | |
287 }; | |
288 methodOop method() const { return _method; } | |
289 int bci() const { return _bci; } | |
290 void oops_do(OopClosure* f); | |
291 | |
292 int num_locked_monitors() { return (_locked_monitors != NULL ? _locked_monitors->length() : 0); } | |
293 GrowableArray<oop>* locked_monitors() { return _locked_monitors; } | |
294 | |
295 void print_on(outputStream* st) const; | |
296 }; | |
297 | |
298 class ThreadConcurrentLocks : public CHeapObj { | |
299 private: | |
300 GrowableArray<instanceOop>* _owned_locks; | |
301 ThreadConcurrentLocks* _next; | |
302 JavaThread* _thread; | |
303 public: | |
304 ThreadConcurrentLocks(JavaThread* thread); | |
305 ~ThreadConcurrentLocks(); | |
306 | |
307 void add_lock(instanceOop o); | |
308 void set_next(ThreadConcurrentLocks* n) { _next = n; } | |
309 ThreadConcurrentLocks* next() { return _next; } | |
310 JavaThread* java_thread() { return _thread; } | |
311 GrowableArray<instanceOop>* owned_locks() { return _owned_locks; } | |
312 void oops_do(OopClosure* f); | |
313 }; | |
314 | |
315 class ConcurrentLocksDump : public StackObj { | |
316 private: | |
317 ThreadConcurrentLocks* _map; | |
318 ThreadConcurrentLocks* _last; // Last ThreadConcurrentLocks in the map | |
319 bool _retain_map_on_free; | |
320 | |
321 void build_map(GrowableArray<oop>* aos_objects); | |
322 void add_lock(JavaThread* thread, instanceOop o); | |
323 | |
324 public: | |
325 ConcurrentLocksDump(bool retain_map_on_free) : _map(NULL), _last(NULL), _retain_map_on_free(retain_map_on_free) {}; | |
326 ConcurrentLocksDump() : _map(NULL), _last(NULL), _retain_map_on_free(false) {}; | |
327 ~ConcurrentLocksDump(); | |
328 | |
329 void dump_at_safepoint(); | |
330 ThreadConcurrentLocks* thread_concurrent_locks(JavaThread* thread); | |
331 void print_locks_on(JavaThread* t, outputStream* st); | |
332 }; | |
333 | |
334 class ThreadDumpResult : public StackObj { | |
335 private: | |
336 int _num_threads; | |
337 int _num_snapshots; | |
338 ThreadSnapshot* _snapshots; | |
339 ThreadSnapshot* _last; | |
340 ThreadDumpResult* _next; | |
341 public: | |
342 ThreadDumpResult(); | |
343 ThreadDumpResult(int num_threads); | |
344 ~ThreadDumpResult(); | |
345 | |
346 void add_thread_snapshot(ThreadSnapshot* ts); | |
347 void set_next(ThreadDumpResult* next) { _next = next; } | |
348 ThreadDumpResult* next() { return _next; } | |
349 int num_threads() { return _num_threads; } | |
350 int num_snapshots() { return _num_snapshots; } | |
351 ThreadSnapshot* snapshots() { return _snapshots; } | |
352 void oops_do(OopClosure* f); | |
353 }; | |
354 | |
355 class DeadlockCycle : public CHeapObj { | |
356 private: | |
357 bool _is_deadlock; | |
358 GrowableArray<JavaThread*>* _threads; | |
359 DeadlockCycle* _next; | |
360 public: | |
361 DeadlockCycle(); | |
362 ~DeadlockCycle(); | |
363 | |
364 DeadlockCycle* next() { return _next; } | |
365 void set_next(DeadlockCycle* d) { _next = d; } | |
366 void add_thread(JavaThread* t) { _threads->append(t); } | |
367 void reset() { _is_deadlock = false; _threads->clear(); } | |
368 void set_deadlock(bool value) { _is_deadlock = value; } | |
369 bool is_deadlock() { return _is_deadlock; } | |
370 int num_threads() { return _threads->length(); } | |
371 GrowableArray<JavaThread*>* threads() { return _threads; } | |
372 void print_on(outputStream* st) const; | |
373 }; | |
374 | |
375 // Utility class to get list of java threads. | |
376 class ThreadsListEnumerator : public StackObj { | |
377 private: | |
378 GrowableArray<instanceHandle>* _threads_array; | |
379 public: | |
380 ThreadsListEnumerator(Thread* cur_thread, | |
381 bool include_jvmti_agent_threads = false, | |
382 bool include_jni_attaching_threads = true); | |
383 int num_threads() { return _threads_array->length(); } | |
384 instanceHandle get_threadObj(int index) { return _threads_array->at(index); } | |
385 }; | |
386 | |
387 | |
388 // abstract utility class to set new thread states, and restore previous after the block exits | |
389 class JavaThreadStatusChanger : public StackObj { | |
390 private: | |
391 java_lang_Thread::ThreadStatus _old_state; | |
392 JavaThread* _java_thread; | |
393 bool _is_alive; | |
394 | |
395 void save_old_state(JavaThread* java_thread) { | |
396 _java_thread = java_thread; | |
397 _is_alive = is_alive(java_thread); | |
398 if (is_alive()) { | |
399 _old_state = java_lang_Thread::get_thread_status(_java_thread->threadObj()); | |
400 } | |
401 } | |
402 | |
403 public: | |
404 static void set_thread_status(JavaThread* java_thread, | |
405 java_lang_Thread::ThreadStatus state) { | |
406 java_lang_Thread::set_thread_status(java_thread->threadObj(), state); | |
407 } | |
408 | |
409 void set_thread_status(java_lang_Thread::ThreadStatus state) { | |
410 if (is_alive()) { | |
411 set_thread_status(_java_thread, state); | |
412 } | |
413 } | |
414 | |
415 JavaThreadStatusChanger(JavaThread* java_thread, | |
416 java_lang_Thread::ThreadStatus state) { | |
417 save_old_state(java_thread); | |
418 set_thread_status(state); | |
419 } | |
420 | |
421 JavaThreadStatusChanger(JavaThread* java_thread) { | |
422 save_old_state(java_thread); | |
423 } | |
424 | |
425 ~JavaThreadStatusChanger() { | |
426 set_thread_status(_old_state); | |
427 } | |
428 | |
429 static bool is_alive(JavaThread* java_thread) { | |
430 return java_thread != NULL && java_thread->threadObj() != NULL; | |
431 } | |
432 | |
433 bool is_alive() { | |
434 return _is_alive; | |
435 } | |
436 }; | |
437 | |
438 // Change status to waiting on an object (timed or indefinite) | |
439 class JavaThreadInObjectWaitState : public JavaThreadStatusChanger { | |
440 private: | |
441 ThreadStatistics* _stat; | |
442 bool _active; | |
443 | |
444 public: | |
445 JavaThreadInObjectWaitState(JavaThread *java_thread, bool timed) : | |
446 JavaThreadStatusChanger(java_thread, | |
447 timed ? java_lang_Thread::IN_OBJECT_WAIT_TIMED : java_lang_Thread::IN_OBJECT_WAIT) { | |
448 if (is_alive()) { | |
449 _stat = java_thread->get_thread_stat(); | |
450 _active = ThreadService::is_thread_monitoring_contention(); | |
451 _stat->monitor_wait(); | |
452 if (_active) { | |
453 _stat->monitor_wait_begin(); | |
454 } | |
455 } else { | |
456 _active = false; | |
457 } | |
458 } | |
459 | |
460 ~JavaThreadInObjectWaitState() { | |
461 if (_active) { | |
462 _stat->monitor_wait_end(); | |
463 } | |
464 } | |
465 }; | |
466 | |
467 // Change status to parked (timed or indefinite) | |
468 class JavaThreadParkedState : public JavaThreadStatusChanger { | |
469 private: | |
470 ThreadStatistics* _stat; | |
471 bool _active; | |
472 | |
473 public: | |
474 JavaThreadParkedState(JavaThread *java_thread, bool timed) : | |
475 JavaThreadStatusChanger(java_thread, | |
476 timed ? java_lang_Thread::PARKED_TIMED : java_lang_Thread::PARKED) { | |
477 if (is_alive()) { | |
478 _stat = java_thread->get_thread_stat(); | |
479 _active = ThreadService::is_thread_monitoring_contention(); | |
480 _stat->monitor_wait(); | |
481 if (_active) { | |
482 _stat->monitor_wait_begin(); | |
483 } | |
484 } else { | |
485 _active = false; | |
486 } | |
487 } | |
488 | |
489 ~JavaThreadParkedState() { | |
490 if (_active) { | |
491 _stat->monitor_wait_end(); | |
492 } | |
493 } | |
494 }; | |
495 | |
496 // Change status to blocked on (re-)entering a synchronization block | |
497 class JavaThreadBlockedOnMonitorEnterState : public JavaThreadStatusChanger { | |
498 private: | |
499 ThreadStatistics* _stat; | |
500 bool _active; | |
501 | |
502 static bool contended_enter_begin(JavaThread *java_thread) { | |
503 set_thread_status(java_thread, java_lang_Thread::BLOCKED_ON_MONITOR_ENTER); | |
504 ThreadStatistics* stat = java_thread->get_thread_stat(); | |
505 stat->contended_enter(); | |
506 bool active = ThreadService::is_thread_monitoring_contention(); | |
507 if (active) { | |
508 stat->contended_enter_begin(); | |
509 } | |
510 return active; | |
511 } | |
512 | |
513 public: | |
514 // java_thread is waiting thread being blocked on monitor reenter. | |
515 // Current thread is the notifying thread which holds the monitor. | |
516 static bool wait_reenter_begin(JavaThread *java_thread, ObjectMonitor *obj_m) { | |
517 assert((java_thread != NULL), "Java thread should not be null here"); | |
518 bool active = false; | |
519 if (is_alive(java_thread) && ServiceUtil::visible_oop((oop)obj_m->object())) { | |
520 active = contended_enter_begin(java_thread); | |
521 } | |
522 return active; | |
523 } | |
524 | |
525 static void wait_reenter_end(JavaThread *java_thread, bool active) { | |
526 if (active) { | |
527 java_thread->get_thread_stat()->contended_enter_end(); | |
528 } | |
529 set_thread_status(java_thread, java_lang_Thread::RUNNABLE); | |
530 } | |
531 | |
532 JavaThreadBlockedOnMonitorEnterState(JavaThread *java_thread, ObjectMonitor *obj_m) : | |
533 JavaThreadStatusChanger(java_thread) { | |
534 assert((java_thread != NULL), "Java thread should not be null here"); | |
535 // Change thread status and collect contended enter stats for monitor contended | |
536 // enter done for external java world objects and it is contended. All other cases | |
537 // like for vm internal objects and for external objects which are not contended | |
538 // thread status is not changed and contended enter stat is not collected. | |
539 _active = false; | |
540 if (is_alive() && ServiceUtil::visible_oop((oop)obj_m->object()) && obj_m->contentions() > 0) { | |
541 _stat = java_thread->get_thread_stat(); | |
542 _active = contended_enter_begin(java_thread); | |
543 } | |
544 } | |
545 | |
546 ~JavaThreadBlockedOnMonitorEnterState() { | |
547 if (_active) { | |
548 _stat->contended_enter_end(); | |
549 } | |
550 } | |
551 }; | |
552 | |
553 // Change status to sleeping | |
554 class JavaThreadSleepState : public JavaThreadStatusChanger { | |
555 private: | |
556 ThreadStatistics* _stat; | |
557 bool _active; | |
558 public: | |
559 JavaThreadSleepState(JavaThread *java_thread) : | |
560 JavaThreadStatusChanger(java_thread, java_lang_Thread::SLEEPING) { | |
561 if (is_alive()) { | |
562 _stat = java_thread->get_thread_stat(); | |
563 _active = ThreadService::is_thread_monitoring_contention(); | |
564 _stat->thread_sleep(); | |
565 if (_active) { | |
566 _stat->thread_sleep_begin(); | |
567 } | |
568 } else { | |
569 _active = false; | |
570 } | |
571 } | |
572 | |
573 ~JavaThreadSleepState() { | |
574 if (_active) { | |
575 _stat->thread_sleep_end(); | |
576 } | |
577 } | |
578 }; | |
1972 | 579 |
580 #endif // SHARE_VM_SERVICES_THREADSERVICE_HPP |