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comparison src/share/vm/services/threadService.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2003-2006 Sun Microsystems, Inc. All Rights Reserved.
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
123 int _class_init_recursion_count;
124 int _class_verify_recursion_count;
125 int _class_link_recursion_count;
126
127 // utility functions
128 void check_and_reset_count() {
129 if (!_count_pending_reset) return;
130 _contended_enter_count = 0;
131 _monitor_wait_count = 0;
132 _sleep_count = 0;
133 _count_pending_reset = 0;
134 }
135 void check_and_reset_timer() {
136 if (!_timer_pending_reset) return;
137 _contended_enter_timer.reset();
138 _monitor_wait_timer.reset();
139 _sleep_timer.reset();
140 _timer_pending_reset = 0;
141 }
142
143 public:
144 ThreadStatistics();
145
146 jlong contended_enter_count() { return (_count_pending_reset ? 0 : _contended_enter_count); }
147 jlong contended_enter_ticks() { return (_timer_pending_reset ? 0 : _contended_enter_timer.active_ticks()); }
148 jlong monitor_wait_count() { return (_count_pending_reset ? 0 : _monitor_wait_count); }
149 jlong monitor_wait_ticks() { return (_timer_pending_reset ? 0 : _monitor_wait_timer.active_ticks()); }
150 jlong sleep_count() { return (_count_pending_reset ? 0 : _sleep_count); }
151 jlong sleep_ticks() { return (_timer_pending_reset ? 0 : _sleep_timer.active_ticks()); }
152
153 void monitor_wait() { check_and_reset_count(); _monitor_wait_count++; }
154 void monitor_wait_begin() { check_and_reset_timer(); _monitor_wait_timer.start(); }
155 void monitor_wait_end() { _monitor_wait_timer.stop(); check_and_reset_timer(); }
156
157 void thread_sleep() { check_and_reset_count(); _sleep_count++; }
158 void thread_sleep_begin() { check_and_reset_timer(); _sleep_timer.start(); }
159 void thread_sleep_end() { _sleep_timer.stop(); check_and_reset_timer(); }
160
161 void contended_enter() { check_and_reset_count(); _contended_enter_count++; }
162 void contended_enter_begin() { check_and_reset_timer(); _contended_enter_timer.start(); }
163 void contended_enter_end() { _contended_enter_timer.stop(); check_and_reset_timer(); }
164
165 void reset_count_stat() { _count_pending_reset = true; }
166 void reset_time_stat() { _timer_pending_reset = true; }
167
168 int* class_init_recursion_count_addr() { return &_class_init_recursion_count; }
169 int* class_verify_recursion_count_addr() { return &_class_verify_recursion_count; }
170 int* class_link_recursion_count_addr() { return &_class_link_recursion_count; }
171 };
172
173 // Thread snapshot to represent the thread state and statistics
174 class ThreadSnapshot : public CHeapObj {
175 private:
176 JavaThread* _thread;
177 oop _threadObj;
178 java_lang_Thread::ThreadStatus _thread_status;
179
180 bool _is_ext_suspended;
181 bool _is_in_native;
182
183 jlong _contended_enter_ticks;
184 jlong _contended_enter_count;
185 jlong _monitor_wait_ticks;
186 jlong _monitor_wait_count;
187 jlong _sleep_ticks;
188 jlong _sleep_count;
189 oop _blocker_object;
190 oop _blocker_object_owner;
191
192 ThreadStackTrace* _stack_trace;
193 ThreadConcurrentLocks* _concurrent_locks;
194 ThreadSnapshot* _next;
195
196 public:
197 // Dummy snapshot
198 ThreadSnapshot() : _thread(NULL), _threadObj(NULL), _stack_trace(NULL), _concurrent_locks(NULL), _next(NULL),
199 _blocker_object(NULL), _blocker_object_owner(NULL) {};
200 ThreadSnapshot(JavaThread* thread);
201 ~ThreadSnapshot();
202
203 java_lang_Thread::ThreadStatus thread_status() { return _thread_status; }
204
205 oop threadObj() const { return _threadObj; }
206
207 void set_next(ThreadSnapshot* n) { _next = n; }
208
209 bool is_ext_suspended() { return _is_ext_suspended; }
210 bool is_in_native() { return _is_in_native; }
211
212 jlong contended_enter_count() { return _contended_enter_count; }
213 jlong contended_enter_ticks() { return _contended_enter_ticks; }
214 jlong monitor_wait_count() { return _monitor_wait_count; }
215 jlong monitor_wait_ticks() { return _monitor_wait_ticks; }
216 jlong sleep_count() { return _sleep_count; }
217 jlong sleep_ticks() { return _sleep_ticks; }
218
219
220 oop blocker_object() { return _blocker_object; }
221 oop blocker_object_owner() { return _blocker_object_owner; }
222
223 ThreadSnapshot* next() const { return _next; }
224 ThreadStackTrace* get_stack_trace() { return _stack_trace; }
225 ThreadConcurrentLocks* get_concurrent_locks() { return _concurrent_locks; }
226
227 void dump_stack_at_safepoint(int max_depth, bool with_locked_monitors);
228 void set_concurrent_locks(ThreadConcurrentLocks* l) { _concurrent_locks = l; }
229 void oops_do(OopClosure* f);
230 };
231
232 class ThreadStackTrace : public CHeapObj {
233 private:
234 JavaThread* _thread;
235 int _depth; // number of stack frames added
236 bool _with_locked_monitors;
237 GrowableArray<StackFrameInfo*>* _frames;
238 GrowableArray<oop>* _jni_locked_monitors;
239
240 public:
241
242 ThreadStackTrace(JavaThread* thread, bool with_locked_monitors);
243 ~ThreadStackTrace();
244
245 StackFrameInfo* stack_frame_at(int i) { return _frames->at(i); }
246 int get_stack_depth() { return _depth; }
247
248 void add_stack_frame(javaVFrame* jvf);
249 void dump_stack_at_safepoint(int max_depth);
250 Handle allocate_fill_stack_trace_element_array(TRAPS);
251 void oops_do(OopClosure* f);
252 GrowableArray<oop>* jni_locked_monitors() { return _jni_locked_monitors; }
253 int num_jni_locked_monitors() { return (_jni_locked_monitors != NULL ? _jni_locked_monitors->length() : 0); }
254
255 bool is_owned_monitor_on_stack(oop object);
256 void add_jni_locked_monitor(oop object) { _jni_locked_monitors->append(object); }
257 };
258
259 // StackFrameInfo for keeping methodOop and bci during
260 // stack walking for later construction of StackTraceElement[]
261 // Java instances
262 class StackFrameInfo : public CHeapObj {
263 private:
264 methodOop _method;
265 int _bci;
266 GrowableArray<oop>* _locked_monitors; // list of object monitors locked by this frame
267
268 public:
269
270 StackFrameInfo(javaVFrame* jvf, bool with_locked_monitors);
271 ~StackFrameInfo() {
272 if (_locked_monitors != NULL) {
273 delete _locked_monitors;
274 }
275 };
276 methodOop method() const { return _method; }
277 int bci() const { return _bci; }
278 void oops_do(OopClosure* f);
279
280 int num_locked_monitors() { return (_locked_monitors != NULL ? _locked_monitors->length() : 0); }
281 GrowableArray<oop>* locked_monitors() { return _locked_monitors; }
282
283 void print_on(outputStream* st) const;
284 };
285
286 class ThreadConcurrentLocks : public CHeapObj {
287 private:
288 GrowableArray<instanceOop>* _owned_locks;
289 ThreadConcurrentLocks* _next;
290 JavaThread* _thread;
291 public:
292 ThreadConcurrentLocks(JavaThread* thread);
293 ~ThreadConcurrentLocks();
294
295 void add_lock(instanceOop o);
296 void set_next(ThreadConcurrentLocks* n) { _next = n; }
297 ThreadConcurrentLocks* next() { return _next; }
298 JavaThread* java_thread() { return _thread; }
299 GrowableArray<instanceOop>* owned_locks() { return _owned_locks; }
300 void oops_do(OopClosure* f);
301 };
302
303 class ConcurrentLocksDump : public StackObj {
304 private:
305 ThreadConcurrentLocks* _map;
306 ThreadConcurrentLocks* _last; // Last ThreadConcurrentLocks in the map
307 bool _retain_map_on_free;
308
309 void build_map(GrowableArray<oop>* aos_objects);
310 void add_lock(JavaThread* thread, instanceOop o);
311
312 public:
313 ConcurrentLocksDump(bool retain_map_on_free) : _map(NULL), _last(NULL), _retain_map_on_free(retain_map_on_free) {};
314 ConcurrentLocksDump() : _map(NULL), _last(NULL), _retain_map_on_free(false) {};
315 ~ConcurrentLocksDump();
316
317 void dump_at_safepoint();
318 ThreadConcurrentLocks* thread_concurrent_locks(JavaThread* thread);
319 void print_locks_on(JavaThread* t, outputStream* st);
320 };
321
322 class ThreadDumpResult : public StackObj {
323 private:
324 int _num_threads;
325 int _num_snapshots;
326 ThreadSnapshot* _snapshots;
327 ThreadSnapshot* _last;
328 ThreadDumpResult* _next;
329 public:
330 ThreadDumpResult();
331 ThreadDumpResult(int num_threads);
332 ~ThreadDumpResult();
333
334 void add_thread_snapshot(ThreadSnapshot* ts);
335 void set_next(ThreadDumpResult* next) { _next = next; }
336 ThreadDumpResult* next() { return _next; }
337 int num_threads() { return _num_threads; }
338 int num_snapshots() { return _num_snapshots; }
339 ThreadSnapshot* snapshots() { return _snapshots; }
340 void oops_do(OopClosure* f);
341 };
342
343 class DeadlockCycle : public CHeapObj {
344 private:
345 bool _is_deadlock;
346 GrowableArray<JavaThread*>* _threads;
347 DeadlockCycle* _next;
348 public:
349 DeadlockCycle();
350 ~DeadlockCycle();
351
352 DeadlockCycle* next() { return _next; }
353 void set_next(DeadlockCycle* d) { _next = d; }
354 void add_thread(JavaThread* t) { _threads->append(t); }
355 void reset() { _is_deadlock = false; _threads->clear(); }
356 void set_deadlock(bool value) { _is_deadlock = value; }
357 bool is_deadlock() { return _is_deadlock; }
358 int num_threads() { return _threads->length(); }
359 GrowableArray<JavaThread*>* threads() { return _threads; }
360 void print_on(outputStream* st) const;
361 };
362
363 // Utility class to get list of java threads.
364 class ThreadsListEnumerator : public StackObj {
365 private:
366 GrowableArray<instanceHandle>* _threads_array;
367 public:
368 ThreadsListEnumerator(Thread* cur_thread,
369 bool include_jvmti_agent_threads = false,
370 bool include_jni_attaching_threads = true);
371 int num_threads() { return _threads_array->length(); }
372 instanceHandle get_threadObj(int index) { return _threads_array->at(index); }
373 };
374
375
376 // abstract utility class to set new thread states, and restore previous after the block exits
377 class JavaThreadStatusChanger : public StackObj {
378 private:
379 java_lang_Thread::ThreadStatus _old_state;
380 JavaThread* _java_thread;
381 bool _is_alive;
382
383 void save_old_state(JavaThread* java_thread) {
384 _java_thread = java_thread;
385 _is_alive = is_alive(java_thread);
386 if (is_alive()) {
387 _old_state = java_lang_Thread::get_thread_status(_java_thread->threadObj());
388 }
389 }
390
391 public:
392 static void set_thread_status(JavaThread* java_thread,
393 java_lang_Thread::ThreadStatus state) {
394 java_lang_Thread::set_thread_status(java_thread->threadObj(), state);
395 }
396
397 void set_thread_status(java_lang_Thread::ThreadStatus state) {
398 if (is_alive()) {
399 set_thread_status(_java_thread, state);
400 }
401 }
402
403 JavaThreadStatusChanger(JavaThread* java_thread,
404 java_lang_Thread::ThreadStatus state) {
405 save_old_state(java_thread);
406 set_thread_status(state);
407 }
408
409 JavaThreadStatusChanger(JavaThread* java_thread) {
410 save_old_state(java_thread);
411 }
412
413 ~JavaThreadStatusChanger() {
414 set_thread_status(_old_state);
415 }
416
417 static bool is_alive(JavaThread* java_thread) {
418 return java_thread != NULL && java_thread->threadObj() != NULL;
419 }
420
421 bool is_alive() {
422 return _is_alive;
423 }
424 };
425
426 // Change status to waiting on an object (timed or indefinite)
427 class JavaThreadInObjectWaitState : public JavaThreadStatusChanger {
428 private:
429 ThreadStatistics* _stat;
430 bool _active;
431
432 public:
433 JavaThreadInObjectWaitState(JavaThread *java_thread, bool timed) :
434 JavaThreadStatusChanger(java_thread,
435 timed ? java_lang_Thread::IN_OBJECT_WAIT_TIMED : java_lang_Thread::IN_OBJECT_WAIT) {
436 if (is_alive()) {
437 _stat = java_thread->get_thread_stat();
438 _active = ThreadService::is_thread_monitoring_contention();
439 _stat->monitor_wait();
440 if (_active) {
441 _stat->monitor_wait_begin();
442 }
443 } else {
444 _active = false;
445 }
446 }
447
448 ~JavaThreadInObjectWaitState() {
449 if (_active) {
450 _stat->monitor_wait_end();
451 }
452 }
453 };
454
455 // Change status to parked (timed or indefinite)
456 class JavaThreadParkedState : public JavaThreadStatusChanger {
457 private:
458 ThreadStatistics* _stat;
459 bool _active;
460
461 public:
462 JavaThreadParkedState(JavaThread *java_thread, bool timed) :
463 JavaThreadStatusChanger(java_thread,
464 timed ? java_lang_Thread::PARKED_TIMED : java_lang_Thread::PARKED) {
465 if (is_alive()) {
466 _stat = java_thread->get_thread_stat();
467 _active = ThreadService::is_thread_monitoring_contention();
468 _stat->monitor_wait();
469 if (_active) {
470 _stat->monitor_wait_begin();
471 }
472 } else {
473 _active = false;
474 }
475 }
476
477 ~JavaThreadParkedState() {
478 if (_active) {
479 _stat->monitor_wait_end();
480 }
481 }
482 };
483
484 // Change status to blocked on (re-)entering a synchronization block
485 class JavaThreadBlockedOnMonitorEnterState : public JavaThreadStatusChanger {
486 private:
487 ThreadStatistics* _stat;
488 bool _active;
489
490 static bool contended_enter_begin(JavaThread *java_thread) {
491 set_thread_status(java_thread, java_lang_Thread::BLOCKED_ON_MONITOR_ENTER);
492 ThreadStatistics* stat = java_thread->get_thread_stat();
493 stat->contended_enter();
494 bool active = ThreadService::is_thread_monitoring_contention();
495 if (active) {
496 stat->contended_enter_begin();
497 }
498 return active;
499 }
500
501 public:
502 // java_thread is waiting thread being blocked on monitor reenter.
503 // Current thread is the notifying thread which holds the monitor.
504 static bool wait_reenter_begin(JavaThread *java_thread, ObjectMonitor *obj_m) {
505 assert((java_thread != NULL), "Java thread should not be null here");
506 bool active = false;
507 if (is_alive(java_thread) && ServiceUtil::visible_oop((oop)obj_m->object())) {
508 active = contended_enter_begin(java_thread);
509 }
510 return active;
511 }
512
513 static void wait_reenter_end(JavaThread *java_thread, bool active) {
514 if (active) {
515 java_thread->get_thread_stat()->contended_enter_end();
516 }
517 set_thread_status(java_thread, java_lang_Thread::RUNNABLE);
518 }
519
520 JavaThreadBlockedOnMonitorEnterState(JavaThread *java_thread, ObjectMonitor *obj_m) :
521 JavaThreadStatusChanger(java_thread) {
522 assert((java_thread != NULL), "Java thread should not be null here");
523 // Change thread status and collect contended enter stats for monitor contended
524 // enter done for external java world objects and it is contended. All other cases
525 // like for vm internal objects and for external objects which are not contended
526 // thread status is not changed and contended enter stat is not collected.
527 _active = false;
528 if (is_alive() && ServiceUtil::visible_oop((oop)obj_m->object()) && obj_m->contentions() > 0) {
529 _stat = java_thread->get_thread_stat();
530 _active = contended_enter_begin(java_thread);
531 }
532 }
533
534 ~JavaThreadBlockedOnMonitorEnterState() {
535 if (_active) {
536 _stat->contended_enter_end();
537 }
538 }
539 };
540
541 // Change status to sleeping
542 class JavaThreadSleepState : public JavaThreadStatusChanger {
543 private:
544 ThreadStatistics* _stat;
545 bool _active;
546 public:
547 JavaThreadSleepState(JavaThread *java_thread) :
548 JavaThreadStatusChanger(java_thread, java_lang_Thread::SLEEPING) {
549 if (is_alive()) {
550 _stat = java_thread->get_thread_stat();
551 _active = ThreadService::is_thread_monitoring_contention();
552 _stat->thread_sleep();
553 if (_active) {
554 _stat->thread_sleep_begin();
555 }
556 } else {
557 _active = false;
558 }
559 }
560
561 ~JavaThreadSleepState() {
562 if (_active) {
563 _stat->thread_sleep_end();
564 }
565 }
566 };