1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/services/threadService.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,592 @@
1.4 +/*
1.5 + * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_SERVICES_THREADSERVICE_HPP
1.29 +#define SHARE_VM_SERVICES_THREADSERVICE_HPP
1.30 +
1.31 +#include "classfile/javaClasses.hpp"
1.32 +#include "runtime/handles.hpp"
1.33 +#include "runtime/init.hpp"
1.34 +#include "runtime/jniHandles.hpp"
1.35 +#include "runtime/objectMonitor.hpp"
1.36 +#include "runtime/objectMonitor.inline.hpp"
1.37 +#include "runtime/perfData.hpp"
1.38 +#include "services/management.hpp"
1.39 +#include "services/serviceUtil.hpp"
1.40 +
1.41 +class OopClosure;
1.42 +class ThreadDumpResult;
1.43 +class ThreadStackTrace;
1.44 +class ThreadSnapshot;
1.45 +class StackFrameInfo;
1.46 +class ThreadConcurrentLocks;
1.47 +class DeadlockCycle;
1.48 +
1.49 +// VM monitoring and management support for the thread and
1.50 +// synchronization subsystem
1.51 +//
1.52 +// Thread contention monitoring is disabled by default.
1.53 +// When enabled, the VM will begin measuring the accumulated
1.54 +// elapsed time a thread blocked on synchronization.
1.55 +//
1.56 +class ThreadService : public AllStatic {
1.57 +private:
1.58 + // These counters could be moved to Threads class
1.59 + static PerfCounter* _total_threads_count;
1.60 + static PerfVariable* _live_threads_count;
1.61 + static PerfVariable* _peak_threads_count;
1.62 + static PerfVariable* _daemon_threads_count;
1.63 +
1.64 + // These 2 counters are atomically incremented once the thread is exiting.
1.65 + // They will be atomically decremented when ThreadService::remove_thread is called.
1.66 + static volatile int _exiting_threads_count;
1.67 + static volatile int _exiting_daemon_threads_count;
1.68 +
1.69 + static bool _thread_monitoring_contention_enabled;
1.70 + static bool _thread_cpu_time_enabled;
1.71 + static bool _thread_allocated_memory_enabled;
1.72 +
1.73 + // Need to keep the list of thread dump result that
1.74 + // keep references to Method* since thread dump can be
1.75 + // requested by multiple threads concurrently.
1.76 + static ThreadDumpResult* _threaddump_list;
1.77 +
1.78 +public:
1.79 + static void init();
1.80 + static void add_thread(JavaThread* thread, bool daemon);
1.81 + static void remove_thread(JavaThread* thread, bool daemon);
1.82 + static void current_thread_exiting(JavaThread* jt);
1.83 +
1.84 + static bool set_thread_monitoring_contention(bool flag);
1.85 + static bool is_thread_monitoring_contention() { return _thread_monitoring_contention_enabled; }
1.86 +
1.87 + static bool set_thread_cpu_time_enabled(bool flag);
1.88 + static bool is_thread_cpu_time_enabled() { return _thread_cpu_time_enabled; }
1.89 +
1.90 + static bool set_thread_allocated_memory_enabled(bool flag);
1.91 + static bool is_thread_allocated_memory_enabled() { return _thread_cpu_time_enabled; }
1.92 +
1.93 + static jlong get_total_thread_count() { return _total_threads_count->get_value(); }
1.94 + static jlong get_peak_thread_count() { return _peak_threads_count->get_value(); }
1.95 + static jlong get_live_thread_count() { return _live_threads_count->get_value() - _exiting_threads_count; }
1.96 + static jlong get_daemon_thread_count() { return _daemon_threads_count->get_value() - _exiting_daemon_threads_count; }
1.97 +
1.98 + static int exiting_threads_count() { return _exiting_threads_count; }
1.99 + static int exiting_daemon_threads_count() { return _exiting_daemon_threads_count; }
1.100 +
1.101 + // Support for thread dump
1.102 + static void add_thread_dump(ThreadDumpResult* dump);
1.103 + static void remove_thread_dump(ThreadDumpResult* dump);
1.104 +
1.105 + static Handle get_current_contended_monitor(JavaThread* thread);
1.106 +
1.107 + // This function is called by JVM_DumpThreads.
1.108 + static Handle dump_stack_traces(GrowableArray<instanceHandle>* threads,
1.109 + int num_threads, TRAPS);
1.110 +
1.111 + static void reset_peak_thread_count();
1.112 + static void reset_contention_count_stat(JavaThread* thread);
1.113 + static void reset_contention_time_stat(JavaThread* thread);
1.114 +
1.115 + static DeadlockCycle* find_deadlocks_at_safepoint(bool object_monitors_only);
1.116 +
1.117 + // GC support
1.118 + static void oops_do(OopClosure* f);
1.119 + static void metadata_do(void f(Metadata*));
1.120 +};
1.121 +
1.122 +// Per-thread Statistics for synchronization
1.123 +class ThreadStatistics : public CHeapObj<mtInternal> {
1.124 +private:
1.125 + // The following contention statistics are only updated by
1.126 + // the thread owning these statistics when contention occurs.
1.127 +
1.128 + jlong _contended_enter_count;
1.129 + elapsedTimer _contended_enter_timer;
1.130 + jlong _monitor_wait_count;
1.131 + elapsedTimer _monitor_wait_timer;
1.132 + jlong _sleep_count;
1.133 + elapsedTimer _sleep_timer;
1.134 +
1.135 +
1.136 + // These two reset flags are set to true when another thread
1.137 + // requests to reset the statistics. The actual statistics
1.138 + // are reset when the thread contention occurs and attempts
1.139 + // to update the statistics.
1.140 + bool _count_pending_reset;
1.141 + bool _timer_pending_reset;
1.142 +
1.143 + // Keep accurate times for potentially recursive class operations
1.144 + int _perf_recursion_counts[6];
1.145 + elapsedTimer _perf_timers[6];
1.146 +
1.147 + // utility functions
1.148 + void check_and_reset_count() {
1.149 + if (!_count_pending_reset) return;
1.150 + _contended_enter_count = 0;
1.151 + _monitor_wait_count = 0;
1.152 + _sleep_count = 0;
1.153 + _count_pending_reset = 0;
1.154 + }
1.155 + void check_and_reset_timer() {
1.156 + if (!_timer_pending_reset) return;
1.157 + _contended_enter_timer.reset();
1.158 + _monitor_wait_timer.reset();
1.159 + _sleep_timer.reset();
1.160 + _timer_pending_reset = 0;
1.161 + }
1.162 +
1.163 +public:
1.164 + ThreadStatistics();
1.165 +
1.166 + jlong contended_enter_count() { return (_count_pending_reset ? 0 : _contended_enter_count); }
1.167 + jlong contended_enter_ticks() { return (_timer_pending_reset ? 0 : _contended_enter_timer.active_ticks()); }
1.168 + jlong monitor_wait_count() { return (_count_pending_reset ? 0 : _monitor_wait_count); }
1.169 + jlong monitor_wait_ticks() { return (_timer_pending_reset ? 0 : _monitor_wait_timer.active_ticks()); }
1.170 + jlong sleep_count() { return (_count_pending_reset ? 0 : _sleep_count); }
1.171 + jlong sleep_ticks() { return (_timer_pending_reset ? 0 : _sleep_timer.active_ticks()); }
1.172 +
1.173 + void monitor_wait() { check_and_reset_count(); _monitor_wait_count++; }
1.174 + void monitor_wait_begin() { check_and_reset_timer(); _monitor_wait_timer.start(); }
1.175 + void monitor_wait_end() { _monitor_wait_timer.stop(); check_and_reset_timer(); }
1.176 +
1.177 + void thread_sleep() { check_and_reset_count(); _sleep_count++; }
1.178 + void thread_sleep_begin() { check_and_reset_timer(); _sleep_timer.start(); }
1.179 + void thread_sleep_end() { _sleep_timer.stop(); check_and_reset_timer(); }
1.180 +
1.181 + void contended_enter() { check_and_reset_count(); _contended_enter_count++; }
1.182 + void contended_enter_begin() { check_and_reset_timer(); _contended_enter_timer.start(); }
1.183 + void contended_enter_end() { _contended_enter_timer.stop(); check_and_reset_timer(); }
1.184 +
1.185 + void reset_count_stat() { _count_pending_reset = true; }
1.186 + void reset_time_stat() { _timer_pending_reset = true; }
1.187 +
1.188 + int* perf_recursion_counts_addr() { return _perf_recursion_counts; }
1.189 + elapsedTimer* perf_timers_addr() { return _perf_timers; }
1.190 +};
1.191 +
1.192 +// Thread snapshot to represent the thread state and statistics
1.193 +class ThreadSnapshot : public CHeapObj<mtInternal> {
1.194 +private:
1.195 + JavaThread* _thread;
1.196 + oop _threadObj;
1.197 + java_lang_Thread::ThreadStatus _thread_status;
1.198 +
1.199 + bool _is_ext_suspended;
1.200 + bool _is_in_native;
1.201 +
1.202 + jlong _contended_enter_ticks;
1.203 + jlong _contended_enter_count;
1.204 + jlong _monitor_wait_ticks;
1.205 + jlong _monitor_wait_count;
1.206 + jlong _sleep_ticks;
1.207 + jlong _sleep_count;
1.208 + oop _blocker_object;
1.209 + oop _blocker_object_owner;
1.210 +
1.211 + ThreadStackTrace* _stack_trace;
1.212 + ThreadConcurrentLocks* _concurrent_locks;
1.213 + ThreadSnapshot* _next;
1.214 +
1.215 +public:
1.216 + // Dummy snapshot
1.217 + ThreadSnapshot() : _thread(NULL), _threadObj(NULL), _stack_trace(NULL), _concurrent_locks(NULL), _next(NULL),
1.218 + _blocker_object(NULL), _blocker_object_owner(NULL) {};
1.219 + ThreadSnapshot(JavaThread* thread);
1.220 + ~ThreadSnapshot();
1.221 +
1.222 + java_lang_Thread::ThreadStatus thread_status() { return _thread_status; }
1.223 +
1.224 + oop threadObj() const { return _threadObj; }
1.225 +
1.226 + void set_next(ThreadSnapshot* n) { _next = n; }
1.227 +
1.228 + bool is_ext_suspended() { return _is_ext_suspended; }
1.229 + bool is_in_native() { return _is_in_native; }
1.230 +
1.231 + jlong contended_enter_count() { return _contended_enter_count; }
1.232 + jlong contended_enter_ticks() { return _contended_enter_ticks; }
1.233 + jlong monitor_wait_count() { return _monitor_wait_count; }
1.234 + jlong monitor_wait_ticks() { return _monitor_wait_ticks; }
1.235 + jlong sleep_count() { return _sleep_count; }
1.236 + jlong sleep_ticks() { return _sleep_ticks; }
1.237 +
1.238 +
1.239 + oop blocker_object() { return _blocker_object; }
1.240 + oop blocker_object_owner() { return _blocker_object_owner; }
1.241 +
1.242 + ThreadSnapshot* next() const { return _next; }
1.243 + ThreadStackTrace* get_stack_trace() { return _stack_trace; }
1.244 + ThreadConcurrentLocks* get_concurrent_locks() { return _concurrent_locks; }
1.245 +
1.246 + void dump_stack_at_safepoint(int max_depth, bool with_locked_monitors);
1.247 + void set_concurrent_locks(ThreadConcurrentLocks* l) { _concurrent_locks = l; }
1.248 + void oops_do(OopClosure* f);
1.249 + void metadata_do(void f(Metadata*));
1.250 +};
1.251 +
1.252 +class ThreadStackTrace : public CHeapObj<mtInternal> {
1.253 + private:
1.254 + JavaThread* _thread;
1.255 + int _depth; // number of stack frames added
1.256 + bool _with_locked_monitors;
1.257 + GrowableArray<StackFrameInfo*>* _frames;
1.258 + GrowableArray<oop>* _jni_locked_monitors;
1.259 +
1.260 + public:
1.261 +
1.262 + ThreadStackTrace(JavaThread* thread, bool with_locked_monitors);
1.263 + ~ThreadStackTrace();
1.264 +
1.265 + JavaThread* thread() { return _thread; }
1.266 + StackFrameInfo* stack_frame_at(int i) { return _frames->at(i); }
1.267 + int get_stack_depth() { return _depth; }
1.268 +
1.269 + void add_stack_frame(javaVFrame* jvf);
1.270 + void dump_stack_at_safepoint(int max_depth);
1.271 + Handle allocate_fill_stack_trace_element_array(TRAPS);
1.272 + void oops_do(OopClosure* f);
1.273 + void metadata_do(void f(Metadata*));
1.274 + GrowableArray<oop>* jni_locked_monitors() { return _jni_locked_monitors; }
1.275 + int num_jni_locked_monitors() { return (_jni_locked_monitors != NULL ? _jni_locked_monitors->length() : 0); }
1.276 +
1.277 + bool is_owned_monitor_on_stack(oop object);
1.278 + void add_jni_locked_monitor(oop object) { _jni_locked_monitors->append(object); }
1.279 +};
1.280 +
1.281 +// StackFrameInfo for keeping Method* and bci during
1.282 +// stack walking for later construction of StackTraceElement[]
1.283 +// Java instances
1.284 +class StackFrameInfo : public CHeapObj<mtInternal> {
1.285 + private:
1.286 + Method* _method;
1.287 + int _bci;
1.288 + GrowableArray<oop>* _locked_monitors; // list of object monitors locked by this frame
1.289 + // We need to save the mirrors in the backtrace to keep the class
1.290 + // from being unloaded while we still have this stack trace.
1.291 + oop _class_holder;
1.292 +
1.293 + public:
1.294 +
1.295 + StackFrameInfo(javaVFrame* jvf, bool with_locked_monitors);
1.296 + ~StackFrameInfo() {
1.297 + if (_locked_monitors != NULL) {
1.298 + delete _locked_monitors;
1.299 + }
1.300 + };
1.301 + Method* method() const { return _method; }
1.302 + int bci() const { return _bci; }
1.303 + void oops_do(OopClosure* f);
1.304 + void metadata_do(void f(Metadata*));
1.305 +
1.306 + int num_locked_monitors() { return (_locked_monitors != NULL ? _locked_monitors->length() : 0); }
1.307 + GrowableArray<oop>* locked_monitors() { return _locked_monitors; }
1.308 +
1.309 + void print_on(outputStream* st) const;
1.310 +};
1.311 +
1.312 +class ThreadConcurrentLocks : public CHeapObj<mtInternal> {
1.313 +private:
1.314 + GrowableArray<instanceOop>* _owned_locks;
1.315 + ThreadConcurrentLocks* _next;
1.316 + JavaThread* _thread;
1.317 + public:
1.318 + ThreadConcurrentLocks(JavaThread* thread);
1.319 + ~ThreadConcurrentLocks();
1.320 +
1.321 + void add_lock(instanceOop o);
1.322 + void set_next(ThreadConcurrentLocks* n) { _next = n; }
1.323 + ThreadConcurrentLocks* next() { return _next; }
1.324 + JavaThread* java_thread() { return _thread; }
1.325 + GrowableArray<instanceOop>* owned_locks() { return _owned_locks; }
1.326 + void oops_do(OopClosure* f);
1.327 +};
1.328 +
1.329 +class ConcurrentLocksDump : public StackObj {
1.330 + private:
1.331 + ThreadConcurrentLocks* _map;
1.332 + ThreadConcurrentLocks* _last; // Last ThreadConcurrentLocks in the map
1.333 + bool _retain_map_on_free;
1.334 +
1.335 + void build_map(GrowableArray<oop>* aos_objects);
1.336 + void add_lock(JavaThread* thread, instanceOop o);
1.337 +
1.338 + public:
1.339 + ConcurrentLocksDump(bool retain_map_on_free) : _map(NULL), _last(NULL), _retain_map_on_free(retain_map_on_free) {};
1.340 + ConcurrentLocksDump() : _map(NULL), _last(NULL), _retain_map_on_free(false) {};
1.341 + ~ConcurrentLocksDump();
1.342 +
1.343 + void dump_at_safepoint();
1.344 + ThreadConcurrentLocks* thread_concurrent_locks(JavaThread* thread);
1.345 + void print_locks_on(JavaThread* t, outputStream* st);
1.346 +};
1.347 +
1.348 +class ThreadDumpResult : public StackObj {
1.349 + private:
1.350 + int _num_threads;
1.351 + int _num_snapshots;
1.352 + ThreadSnapshot* _snapshots;
1.353 + ThreadSnapshot* _last;
1.354 + ThreadDumpResult* _next;
1.355 + public:
1.356 + ThreadDumpResult();
1.357 + ThreadDumpResult(int num_threads);
1.358 + ~ThreadDumpResult();
1.359 +
1.360 + void add_thread_snapshot(ThreadSnapshot* ts);
1.361 + void set_next(ThreadDumpResult* next) { _next = next; }
1.362 + ThreadDumpResult* next() { return _next; }
1.363 + int num_threads() { return _num_threads; }
1.364 + int num_snapshots() { return _num_snapshots; }
1.365 + ThreadSnapshot* snapshots() { return _snapshots; }
1.366 + void oops_do(OopClosure* f);
1.367 + void metadata_do(void f(Metadata*));
1.368 +};
1.369 +
1.370 +class DeadlockCycle : public CHeapObj<mtInternal> {
1.371 + private:
1.372 + bool _is_deadlock;
1.373 + GrowableArray<JavaThread*>* _threads;
1.374 + DeadlockCycle* _next;
1.375 + public:
1.376 + DeadlockCycle();
1.377 + ~DeadlockCycle();
1.378 +
1.379 + DeadlockCycle* next() { return _next; }
1.380 + void set_next(DeadlockCycle* d) { _next = d; }
1.381 + void add_thread(JavaThread* t) { _threads->append(t); }
1.382 + void reset() { _is_deadlock = false; _threads->clear(); }
1.383 + void set_deadlock(bool value) { _is_deadlock = value; }
1.384 + bool is_deadlock() { return _is_deadlock; }
1.385 + int num_threads() { return _threads->length(); }
1.386 + GrowableArray<JavaThread*>* threads() { return _threads; }
1.387 + void print_on(outputStream* st) const;
1.388 +};
1.389 +
1.390 +// Utility class to get list of java threads.
1.391 +class ThreadsListEnumerator : public StackObj {
1.392 +private:
1.393 + GrowableArray<instanceHandle>* _threads_array;
1.394 +public:
1.395 + ThreadsListEnumerator(Thread* cur_thread,
1.396 + bool include_jvmti_agent_threads = false,
1.397 + bool include_jni_attaching_threads = true);
1.398 + int num_threads() { return _threads_array->length(); }
1.399 + instanceHandle get_threadObj(int index) { return _threads_array->at(index); }
1.400 +};
1.401 +
1.402 +
1.403 +// abstract utility class to set new thread states, and restore previous after the block exits
1.404 +class JavaThreadStatusChanger : public StackObj {
1.405 + private:
1.406 + java_lang_Thread::ThreadStatus _old_state;
1.407 + JavaThread* _java_thread;
1.408 + bool _is_alive;
1.409 +
1.410 + void save_old_state(JavaThread* java_thread) {
1.411 + _java_thread = java_thread;
1.412 + _is_alive = is_alive(java_thread);
1.413 + if (is_alive()) {
1.414 + _old_state = java_lang_Thread::get_thread_status(_java_thread->threadObj());
1.415 + }
1.416 + }
1.417 +
1.418 + public:
1.419 + static void set_thread_status(JavaThread* java_thread,
1.420 + java_lang_Thread::ThreadStatus state) {
1.421 + java_lang_Thread::set_thread_status(java_thread->threadObj(), state);
1.422 + }
1.423 +
1.424 + void set_thread_status(java_lang_Thread::ThreadStatus state) {
1.425 + if (is_alive()) {
1.426 + set_thread_status(_java_thread, state);
1.427 + }
1.428 + }
1.429 +
1.430 + JavaThreadStatusChanger(JavaThread* java_thread,
1.431 + java_lang_Thread::ThreadStatus state) {
1.432 + save_old_state(java_thread);
1.433 + set_thread_status(state);
1.434 + }
1.435 +
1.436 + JavaThreadStatusChanger(JavaThread* java_thread) {
1.437 + save_old_state(java_thread);
1.438 + }
1.439 +
1.440 + ~JavaThreadStatusChanger() {
1.441 + set_thread_status(_old_state);
1.442 + }
1.443 +
1.444 + static bool is_alive(JavaThread* java_thread) {
1.445 + return java_thread != NULL && java_thread->threadObj() != NULL;
1.446 + }
1.447 +
1.448 + bool is_alive() {
1.449 + return _is_alive;
1.450 + }
1.451 +};
1.452 +
1.453 +// Change status to waiting on an object (timed or indefinite)
1.454 +class JavaThreadInObjectWaitState : public JavaThreadStatusChanger {
1.455 + private:
1.456 + ThreadStatistics* _stat;
1.457 + bool _active;
1.458 +
1.459 + public:
1.460 + JavaThreadInObjectWaitState(JavaThread *java_thread, bool timed) :
1.461 + JavaThreadStatusChanger(java_thread,
1.462 + timed ? java_lang_Thread::IN_OBJECT_WAIT_TIMED : java_lang_Thread::IN_OBJECT_WAIT) {
1.463 + if (is_alive()) {
1.464 + _stat = java_thread->get_thread_stat();
1.465 + _active = ThreadService::is_thread_monitoring_contention();
1.466 + _stat->monitor_wait();
1.467 + if (_active) {
1.468 + _stat->monitor_wait_begin();
1.469 + }
1.470 + } else {
1.471 + _active = false;
1.472 + }
1.473 + }
1.474 +
1.475 + ~JavaThreadInObjectWaitState() {
1.476 + if (_active) {
1.477 + _stat->monitor_wait_end();
1.478 + }
1.479 + }
1.480 +};
1.481 +
1.482 +// Change status to parked (timed or indefinite)
1.483 +class JavaThreadParkedState : public JavaThreadStatusChanger {
1.484 + private:
1.485 + ThreadStatistics* _stat;
1.486 + bool _active;
1.487 +
1.488 + public:
1.489 + JavaThreadParkedState(JavaThread *java_thread, bool timed) :
1.490 + JavaThreadStatusChanger(java_thread,
1.491 + timed ? java_lang_Thread::PARKED_TIMED : java_lang_Thread::PARKED) {
1.492 + if (is_alive()) {
1.493 + _stat = java_thread->get_thread_stat();
1.494 + _active = ThreadService::is_thread_monitoring_contention();
1.495 + _stat->monitor_wait();
1.496 + if (_active) {
1.497 + _stat->monitor_wait_begin();
1.498 + }
1.499 + } else {
1.500 + _active = false;
1.501 + }
1.502 + }
1.503 +
1.504 + ~JavaThreadParkedState() {
1.505 + if (_active) {
1.506 + _stat->monitor_wait_end();
1.507 + }
1.508 + }
1.509 +};
1.510 +
1.511 +// Change status to blocked on (re-)entering a synchronization block
1.512 +class JavaThreadBlockedOnMonitorEnterState : public JavaThreadStatusChanger {
1.513 + private:
1.514 + ThreadStatistics* _stat;
1.515 + bool _active;
1.516 +
1.517 + static bool contended_enter_begin(JavaThread *java_thread) {
1.518 + set_thread_status(java_thread, java_lang_Thread::BLOCKED_ON_MONITOR_ENTER);
1.519 + ThreadStatistics* stat = java_thread->get_thread_stat();
1.520 + stat->contended_enter();
1.521 + bool active = ThreadService::is_thread_monitoring_contention();
1.522 + if (active) {
1.523 + stat->contended_enter_begin();
1.524 + }
1.525 + return active;
1.526 + }
1.527 +
1.528 + public:
1.529 + // java_thread is waiting thread being blocked on monitor reenter.
1.530 + // Current thread is the notifying thread which holds the monitor.
1.531 + static bool wait_reenter_begin(JavaThread *java_thread, ObjectMonitor *obj_m) {
1.532 + assert((java_thread != NULL), "Java thread should not be null here");
1.533 + bool active = false;
1.534 + if (is_alive(java_thread) && ServiceUtil::visible_oop((oop)obj_m->object())) {
1.535 + active = contended_enter_begin(java_thread);
1.536 + }
1.537 + return active;
1.538 + }
1.539 +
1.540 + static void wait_reenter_end(JavaThread *java_thread, bool active) {
1.541 + if (active) {
1.542 + java_thread->get_thread_stat()->contended_enter_end();
1.543 + }
1.544 + set_thread_status(java_thread, java_lang_Thread::RUNNABLE);
1.545 + }
1.546 +
1.547 + JavaThreadBlockedOnMonitorEnterState(JavaThread *java_thread, ObjectMonitor *obj_m) :
1.548 + JavaThreadStatusChanger(java_thread) {
1.549 + assert((java_thread != NULL), "Java thread should not be null here");
1.550 + // Change thread status and collect contended enter stats for monitor contended
1.551 + // enter done for external java world objects and it is contended. All other cases
1.552 + // like for vm internal objects and for external objects which are not contended
1.553 + // thread status is not changed and contended enter stat is not collected.
1.554 + _active = false;
1.555 + if (is_alive() && ServiceUtil::visible_oop((oop)obj_m->object()) && obj_m->contentions() > 0) {
1.556 + _stat = java_thread->get_thread_stat();
1.557 + _active = contended_enter_begin(java_thread);
1.558 + }
1.559 + }
1.560 +
1.561 + ~JavaThreadBlockedOnMonitorEnterState() {
1.562 + if (_active) {
1.563 + _stat->contended_enter_end();
1.564 + }
1.565 + }
1.566 +};
1.567 +
1.568 +// Change status to sleeping
1.569 +class JavaThreadSleepState : public JavaThreadStatusChanger {
1.570 + private:
1.571 + ThreadStatistics* _stat;
1.572 + bool _active;
1.573 + public:
1.574 + JavaThreadSleepState(JavaThread *java_thread) :
1.575 + JavaThreadStatusChanger(java_thread, java_lang_Thread::SLEEPING) {
1.576 + if (is_alive()) {
1.577 + _stat = java_thread->get_thread_stat();
1.578 + _active = ThreadService::is_thread_monitoring_contention();
1.579 + _stat->thread_sleep();
1.580 + if (_active) {
1.581 + _stat->thread_sleep_begin();
1.582 + }
1.583 + } else {
1.584 + _active = false;
1.585 + }
1.586 + }
1.587 +
1.588 + ~JavaThreadSleepState() {
1.589 + if (_active) {
1.590 + _stat->thread_sleep_end();
1.591 + }
1.592 + }
1.593 +};
1.594 +
1.595 +#endif // SHARE_VM_SERVICES_THREADSERVICE_HPP
