Mercurial > hg > truffle
annotate src/share/vm/services/threadService.hpp @ 4530:6c6cb7be1324
bugfix
author | Christian Haeubl <christian.haeubl@oracle.com> |
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date | Wed, 08 Feb 2012 21:13:35 -0800 |
parents | b1a2afa37ec4 |
children | d2a62e0f25eb |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2003, 2011, 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 | |
71 // keep references to methodOop since thread dump can be | |
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); | |
116 }; | |
117 | |
118 // Per-thread Statistics for synchronization | |
119 class ThreadStatistics : public CHeapObj { | |
120 private: | |
121 // The following contention statistics are only updated by | |
122 // the thread owning these statistics when contention occurs. | |
123 | |
124 jlong _contended_enter_count; | |
125 elapsedTimer _contended_enter_timer; | |
126 jlong _monitor_wait_count; | |
127 elapsedTimer _monitor_wait_timer; | |
128 jlong _sleep_count; | |
129 elapsedTimer _sleep_timer; | |
130 | |
131 | |
132 // These two reset flags are set to true when another thread | |
133 // requests to reset the statistics. The actual statistics | |
134 // are reset when the thread contention occurs and attempts | |
135 // to update the statistics. | |
136 bool _count_pending_reset; | |
137 bool _timer_pending_reset; | |
138 | |
139 // Keep accurate times for potentially recursive class operations | |
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140 int _perf_recursion_counts[6]; |
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141 elapsedTimer _perf_timers[6]; |
0 | 142 |
143 // utility functions | |
144 void check_and_reset_count() { | |
145 if (!_count_pending_reset) return; | |
146 _contended_enter_count = 0; | |
147 _monitor_wait_count = 0; | |
148 _sleep_count = 0; | |
149 _count_pending_reset = 0; | |
150 } | |
151 void check_and_reset_timer() { | |
152 if (!_timer_pending_reset) return; | |
153 _contended_enter_timer.reset(); | |
154 _monitor_wait_timer.reset(); | |
155 _sleep_timer.reset(); | |
156 _timer_pending_reset = 0; | |
157 } | |
158 | |
159 public: | |
160 ThreadStatistics(); | |
161 | |
162 jlong contended_enter_count() { return (_count_pending_reset ? 0 : _contended_enter_count); } | |
163 jlong contended_enter_ticks() { return (_timer_pending_reset ? 0 : _contended_enter_timer.active_ticks()); } | |
164 jlong monitor_wait_count() { return (_count_pending_reset ? 0 : _monitor_wait_count); } | |
165 jlong monitor_wait_ticks() { return (_timer_pending_reset ? 0 : _monitor_wait_timer.active_ticks()); } | |
166 jlong sleep_count() { return (_count_pending_reset ? 0 : _sleep_count); } | |
167 jlong sleep_ticks() { return (_timer_pending_reset ? 0 : _sleep_timer.active_ticks()); } | |
168 | |
169 void monitor_wait() { check_and_reset_count(); _monitor_wait_count++; } | |
170 void monitor_wait_begin() { check_and_reset_timer(); _monitor_wait_timer.start(); } | |
171 void monitor_wait_end() { _monitor_wait_timer.stop(); check_and_reset_timer(); } | |
172 | |
173 void thread_sleep() { check_and_reset_count(); _sleep_count++; } | |
174 void thread_sleep_begin() { check_and_reset_timer(); _sleep_timer.start(); } | |
175 void thread_sleep_end() { _sleep_timer.stop(); check_and_reset_timer(); } | |
176 | |
177 void contended_enter() { check_and_reset_count(); _contended_enter_count++; } | |
178 void contended_enter_begin() { check_and_reset_timer(); _contended_enter_timer.start(); } | |
179 void contended_enter_end() { _contended_enter_timer.stop(); check_and_reset_timer(); } | |
180 | |
181 void reset_count_stat() { _count_pending_reset = true; } | |
182 void reset_time_stat() { _timer_pending_reset = true; } | |
183 | |
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184 int* perf_recursion_counts_addr() { return _perf_recursion_counts; } |
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185 elapsedTimer* perf_timers_addr() { return _perf_timers; } |
0 | 186 }; |
187 | |
188 // Thread snapshot to represent the thread state and statistics | |
189 class ThreadSnapshot : public CHeapObj { | |
190 private: | |
191 JavaThread* _thread; | |
192 oop _threadObj; | |
193 java_lang_Thread::ThreadStatus _thread_status; | |
194 | |
195 bool _is_ext_suspended; | |
196 bool _is_in_native; | |
197 | |
198 jlong _contended_enter_ticks; | |
199 jlong _contended_enter_count; | |
200 jlong _monitor_wait_ticks; | |
201 jlong _monitor_wait_count; | |
202 jlong _sleep_ticks; | |
203 jlong _sleep_count; | |
204 oop _blocker_object; | |
205 oop _blocker_object_owner; | |
206 | |
207 ThreadStackTrace* _stack_trace; | |
208 ThreadConcurrentLocks* _concurrent_locks; | |
209 ThreadSnapshot* _next; | |
210 | |
211 public: | |
212 // Dummy snapshot | |
213 ThreadSnapshot() : _thread(NULL), _threadObj(NULL), _stack_trace(NULL), _concurrent_locks(NULL), _next(NULL), | |
214 _blocker_object(NULL), _blocker_object_owner(NULL) {}; | |
215 ThreadSnapshot(JavaThread* thread); | |
216 ~ThreadSnapshot(); | |
217 | |
218 java_lang_Thread::ThreadStatus thread_status() { return _thread_status; } | |
219 | |
220 oop threadObj() const { return _threadObj; } | |
221 | |
222 void set_next(ThreadSnapshot* n) { _next = n; } | |
223 | |
224 bool is_ext_suspended() { return _is_ext_suspended; } | |
225 bool is_in_native() { return _is_in_native; } | |
226 | |
227 jlong contended_enter_count() { return _contended_enter_count; } | |
228 jlong contended_enter_ticks() { return _contended_enter_ticks; } | |
229 jlong monitor_wait_count() { return _monitor_wait_count; } | |
230 jlong monitor_wait_ticks() { return _monitor_wait_ticks; } | |
231 jlong sleep_count() { return _sleep_count; } | |
232 jlong sleep_ticks() { return _sleep_ticks; } | |
233 | |
234 | |
235 oop blocker_object() { return _blocker_object; } | |
236 oop blocker_object_owner() { return _blocker_object_owner; } | |
237 | |
238 ThreadSnapshot* next() const { return _next; } | |
239 ThreadStackTrace* get_stack_trace() { return _stack_trace; } | |
240 ThreadConcurrentLocks* get_concurrent_locks() { return _concurrent_locks; } | |
241 | |
242 void dump_stack_at_safepoint(int max_depth, bool with_locked_monitors); | |
243 void set_concurrent_locks(ThreadConcurrentLocks* l) { _concurrent_locks = l; } | |
244 void oops_do(OopClosure* f); | |
245 }; | |
246 | |
247 class ThreadStackTrace : public CHeapObj { | |
248 private: | |
249 JavaThread* _thread; | |
250 int _depth; // number of stack frames added | |
251 bool _with_locked_monitors; | |
252 GrowableArray<StackFrameInfo*>* _frames; | |
253 GrowableArray<oop>* _jni_locked_monitors; | |
254 | |
255 public: | |
256 | |
257 ThreadStackTrace(JavaThread* thread, bool with_locked_monitors); | |
258 ~ThreadStackTrace(); | |
259 | |
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260 JavaThread* thread() { return _thread; } |
0 | 261 StackFrameInfo* stack_frame_at(int i) { return _frames->at(i); } |
262 int get_stack_depth() { return _depth; } | |
263 | |
264 void add_stack_frame(javaVFrame* jvf); | |
265 void dump_stack_at_safepoint(int max_depth); | |
266 Handle allocate_fill_stack_trace_element_array(TRAPS); | |
267 void oops_do(OopClosure* f); | |
268 GrowableArray<oop>* jni_locked_monitors() { return _jni_locked_monitors; } | |
269 int num_jni_locked_monitors() { return (_jni_locked_monitors != NULL ? _jni_locked_monitors->length() : 0); } | |
270 | |
271 bool is_owned_monitor_on_stack(oop object); | |
272 void add_jni_locked_monitor(oop object) { _jni_locked_monitors->append(object); } | |
273 }; | |
274 | |
275 // StackFrameInfo for keeping methodOop and bci during | |
276 // stack walking for later construction of StackTraceElement[] | |
277 // Java instances | |
278 class StackFrameInfo : public CHeapObj { | |
279 private: | |
280 methodOop _method; | |
281 int _bci; | |
282 GrowableArray<oop>* _locked_monitors; // list of object monitors locked by this frame | |
283 | |
284 public: | |
285 | |
286 StackFrameInfo(javaVFrame* jvf, bool with_locked_monitors); | |
287 ~StackFrameInfo() { | |
288 if (_locked_monitors != NULL) { | |
289 delete _locked_monitors; | |
290 } | |
291 }; | |
292 methodOop method() const { return _method; } | |
293 int bci() const { return _bci; } | |
294 void oops_do(OopClosure* f); | |
295 | |
296 int num_locked_monitors() { return (_locked_monitors != NULL ? _locked_monitors->length() : 0); } | |
297 GrowableArray<oop>* locked_monitors() { return _locked_monitors; } | |
298 | |
299 void print_on(outputStream* st) const; | |
300 }; | |
301 | |
302 class ThreadConcurrentLocks : public CHeapObj { | |
303 private: | |
304 GrowableArray<instanceOop>* _owned_locks; | |
305 ThreadConcurrentLocks* _next; | |
306 JavaThread* _thread; | |
307 public: | |
308 ThreadConcurrentLocks(JavaThread* thread); | |
309 ~ThreadConcurrentLocks(); | |
310 | |
311 void add_lock(instanceOop o); | |
312 void set_next(ThreadConcurrentLocks* n) { _next = n; } | |
313 ThreadConcurrentLocks* next() { return _next; } | |
314 JavaThread* java_thread() { return _thread; } | |
315 GrowableArray<instanceOop>* owned_locks() { return _owned_locks; } | |
316 void oops_do(OopClosure* f); | |
317 }; | |
318 | |
319 class ConcurrentLocksDump : public StackObj { | |
320 private: | |
321 ThreadConcurrentLocks* _map; | |
322 ThreadConcurrentLocks* _last; // Last ThreadConcurrentLocks in the map | |
323 bool _retain_map_on_free; | |
324 | |
325 void build_map(GrowableArray<oop>* aos_objects); | |
326 void add_lock(JavaThread* thread, instanceOop o); | |
327 | |
328 public: | |
329 ConcurrentLocksDump(bool retain_map_on_free) : _map(NULL), _last(NULL), _retain_map_on_free(retain_map_on_free) {}; | |
330 ConcurrentLocksDump() : _map(NULL), _last(NULL), _retain_map_on_free(false) {}; | |
331 ~ConcurrentLocksDump(); | |
332 | |
333 void dump_at_safepoint(); | |
334 ThreadConcurrentLocks* thread_concurrent_locks(JavaThread* thread); | |
335 void print_locks_on(JavaThread* t, outputStream* st); | |
336 }; | |
337 | |
338 class ThreadDumpResult : public StackObj { | |
339 private: | |
340 int _num_threads; | |
341 int _num_snapshots; | |
342 ThreadSnapshot* _snapshots; | |
343 ThreadSnapshot* _last; | |
344 ThreadDumpResult* _next; | |
345 public: | |
346 ThreadDumpResult(); | |
347 ThreadDumpResult(int num_threads); | |
348 ~ThreadDumpResult(); | |
349 | |
350 void add_thread_snapshot(ThreadSnapshot* ts); | |
351 void set_next(ThreadDumpResult* next) { _next = next; } | |
352 ThreadDumpResult* next() { return _next; } | |
353 int num_threads() { return _num_threads; } | |
354 int num_snapshots() { return _num_snapshots; } | |
355 ThreadSnapshot* snapshots() { return _snapshots; } | |
356 void oops_do(OopClosure* f); | |
357 }; | |
358 | |
359 class DeadlockCycle : public CHeapObj { | |
360 private: | |
361 bool _is_deadlock; | |
362 GrowableArray<JavaThread*>* _threads; | |
363 DeadlockCycle* _next; | |
364 public: | |
365 DeadlockCycle(); | |
366 ~DeadlockCycle(); | |
367 | |
368 DeadlockCycle* next() { return _next; } | |
369 void set_next(DeadlockCycle* d) { _next = d; } | |
370 void add_thread(JavaThread* t) { _threads->append(t); } | |
371 void reset() { _is_deadlock = false; _threads->clear(); } | |
372 void set_deadlock(bool value) { _is_deadlock = value; } | |
373 bool is_deadlock() { return _is_deadlock; } | |
374 int num_threads() { return _threads->length(); } | |
375 GrowableArray<JavaThread*>* threads() { return _threads; } | |
376 void print_on(outputStream* st) const; | |
377 }; | |
378 | |
379 // Utility class to get list of java threads. | |
380 class ThreadsListEnumerator : public StackObj { | |
381 private: | |
382 GrowableArray<instanceHandle>* _threads_array; | |
383 public: | |
384 ThreadsListEnumerator(Thread* cur_thread, | |
385 bool include_jvmti_agent_threads = false, | |
386 bool include_jni_attaching_threads = true); | |
387 int num_threads() { return _threads_array->length(); } | |
388 instanceHandle get_threadObj(int index) { return _threads_array->at(index); } | |
389 }; | |
390 | |
391 | |
392 // abstract utility class to set new thread states, and restore previous after the block exits | |
393 class JavaThreadStatusChanger : public StackObj { | |
394 private: | |
395 java_lang_Thread::ThreadStatus _old_state; | |
396 JavaThread* _java_thread; | |
397 bool _is_alive; | |
398 | |
399 void save_old_state(JavaThread* java_thread) { | |
400 _java_thread = java_thread; | |
401 _is_alive = is_alive(java_thread); | |
402 if (is_alive()) { | |
403 _old_state = java_lang_Thread::get_thread_status(_java_thread->threadObj()); | |
404 } | |
405 } | |
406 | |
407 public: | |
408 static void set_thread_status(JavaThread* java_thread, | |
409 java_lang_Thread::ThreadStatus state) { | |
410 java_lang_Thread::set_thread_status(java_thread->threadObj(), state); | |
411 } | |
412 | |
413 void set_thread_status(java_lang_Thread::ThreadStatus state) { | |
414 if (is_alive()) { | |
415 set_thread_status(_java_thread, state); | |
416 } | |
417 } | |
418 | |
419 JavaThreadStatusChanger(JavaThread* java_thread, | |
420 java_lang_Thread::ThreadStatus state) { | |
421 save_old_state(java_thread); | |
422 set_thread_status(state); | |
423 } | |
424 | |
425 JavaThreadStatusChanger(JavaThread* java_thread) { | |
426 save_old_state(java_thread); | |
427 } | |
428 | |
429 ~JavaThreadStatusChanger() { | |
430 set_thread_status(_old_state); | |
431 } | |
432 | |
433 static bool is_alive(JavaThread* java_thread) { | |
434 return java_thread != NULL && java_thread->threadObj() != NULL; | |
435 } | |
436 | |
437 bool is_alive() { | |
438 return _is_alive; | |
439 } | |
440 }; | |
441 | |
442 // Change status to waiting on an object (timed or indefinite) | |
443 class JavaThreadInObjectWaitState : public JavaThreadStatusChanger { | |
444 private: | |
445 ThreadStatistics* _stat; | |
446 bool _active; | |
447 | |
448 public: | |
449 JavaThreadInObjectWaitState(JavaThread *java_thread, bool timed) : | |
450 JavaThreadStatusChanger(java_thread, | |
451 timed ? java_lang_Thread::IN_OBJECT_WAIT_TIMED : java_lang_Thread::IN_OBJECT_WAIT) { | |
452 if (is_alive()) { | |
453 _stat = java_thread->get_thread_stat(); | |
454 _active = ThreadService::is_thread_monitoring_contention(); | |
455 _stat->monitor_wait(); | |
456 if (_active) { | |
457 _stat->monitor_wait_begin(); | |
458 } | |
459 } else { | |
460 _active = false; | |
461 } | |
462 } | |
463 | |
464 ~JavaThreadInObjectWaitState() { | |
465 if (_active) { | |
466 _stat->monitor_wait_end(); | |
467 } | |
468 } | |
469 }; | |
470 | |
471 // Change status to parked (timed or indefinite) | |
472 class JavaThreadParkedState : public JavaThreadStatusChanger { | |
473 private: | |
474 ThreadStatistics* _stat; | |
475 bool _active; | |
476 | |
477 public: | |
478 JavaThreadParkedState(JavaThread *java_thread, bool timed) : | |
479 JavaThreadStatusChanger(java_thread, | |
480 timed ? java_lang_Thread::PARKED_TIMED : java_lang_Thread::PARKED) { | |
481 if (is_alive()) { | |
482 _stat = java_thread->get_thread_stat(); | |
483 _active = ThreadService::is_thread_monitoring_contention(); | |
484 _stat->monitor_wait(); | |
485 if (_active) { | |
486 _stat->monitor_wait_begin(); | |
487 } | |
488 } else { | |
489 _active = false; | |
490 } | |
491 } | |
492 | |
493 ~JavaThreadParkedState() { | |
494 if (_active) { | |
495 _stat->monitor_wait_end(); | |
496 } | |
497 } | |
498 }; | |
499 | |
500 // Change status to blocked on (re-)entering a synchronization block | |
501 class JavaThreadBlockedOnMonitorEnterState : public JavaThreadStatusChanger { | |
502 private: | |
503 ThreadStatistics* _stat; | |
504 bool _active; | |
505 | |
506 static bool contended_enter_begin(JavaThread *java_thread) { | |
507 set_thread_status(java_thread, java_lang_Thread::BLOCKED_ON_MONITOR_ENTER); | |
508 ThreadStatistics* stat = java_thread->get_thread_stat(); | |
509 stat->contended_enter(); | |
510 bool active = ThreadService::is_thread_monitoring_contention(); | |
511 if (active) { | |
512 stat->contended_enter_begin(); | |
513 } | |
514 return active; | |
515 } | |
516 | |
517 public: | |
518 // java_thread is waiting thread being blocked on monitor reenter. | |
519 // Current thread is the notifying thread which holds the monitor. | |
520 static bool wait_reenter_begin(JavaThread *java_thread, ObjectMonitor *obj_m) { | |
521 assert((java_thread != NULL), "Java thread should not be null here"); | |
522 bool active = false; | |
523 if (is_alive(java_thread) && ServiceUtil::visible_oop((oop)obj_m->object())) { | |
524 active = contended_enter_begin(java_thread); | |
525 } | |
526 return active; | |
527 } | |
528 | |
529 static void wait_reenter_end(JavaThread *java_thread, bool active) { | |
530 if (active) { | |
531 java_thread->get_thread_stat()->contended_enter_end(); | |
532 } | |
533 set_thread_status(java_thread, java_lang_Thread::RUNNABLE); | |
534 } | |
535 | |
536 JavaThreadBlockedOnMonitorEnterState(JavaThread *java_thread, ObjectMonitor *obj_m) : | |
537 JavaThreadStatusChanger(java_thread) { | |
538 assert((java_thread != NULL), "Java thread should not be null here"); | |
539 // Change thread status and collect contended enter stats for monitor contended | |
540 // enter done for external java world objects and it is contended. All other cases | |
541 // like for vm internal objects and for external objects which are not contended | |
542 // thread status is not changed and contended enter stat is not collected. | |
543 _active = false; | |
544 if (is_alive() && ServiceUtil::visible_oop((oop)obj_m->object()) && obj_m->contentions() > 0) { | |
545 _stat = java_thread->get_thread_stat(); | |
546 _active = contended_enter_begin(java_thread); | |
547 } | |
548 } | |
549 | |
550 ~JavaThreadBlockedOnMonitorEnterState() { | |
551 if (_active) { | |
552 _stat->contended_enter_end(); | |
553 } | |
554 } | |
555 }; | |
556 | |
557 // Change status to sleeping | |
558 class JavaThreadSleepState : public JavaThreadStatusChanger { | |
559 private: | |
560 ThreadStatistics* _stat; | |
561 bool _active; | |
562 public: | |
563 JavaThreadSleepState(JavaThread *java_thread) : | |
564 JavaThreadStatusChanger(java_thread, java_lang_Thread::SLEEPING) { | |
565 if (is_alive()) { | |
566 _stat = java_thread->get_thread_stat(); | |
567 _active = ThreadService::is_thread_monitoring_contention(); | |
568 _stat->thread_sleep(); | |
569 if (_active) { | |
570 _stat->thread_sleep_begin(); | |
571 } | |
572 } else { | |
573 _active = false; | |
574 } | |
575 } | |
576 | |
577 ~JavaThreadSleepState() { | |
578 if (_active) { | |
579 _stat->thread_sleep_end(); | |
580 } | |
581 } | |
582 }; | |
1972 | 583 |
584 #endif // SHARE_VM_SERVICES_THREADSERVICE_HPP |