truffle: src/share/vm/services/threadService.cpp comparison

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

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author	duke
date	Sat, 01 Dec 2007 00:00:00 +0000
parents
children	60b728ec77c1

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--1:000000000000
+:a61af66fc99e
+/*
+* Copyright 2003-2007 Sun Microsystems, Inc.  All Rights Reserved.
+* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+*
+* This code is free software; you can redistribute it and/or modify it
+* under the terms of the GNU General Public License version 2 only, as
+* published by the Free Software Foundation.
+*
+* This code is distributed in the hope that it will be useful, but WITHOUT
+* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+* version 2 for more details (a copy is included in the LICENSE file that
+* accompanied this code).
+*
+* You should have received a copy of the GNU General Public License version
+* 2 along with this work; if not, write to the Free Software Foundation,
+* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+*
+* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+* CA 95054 USA or visit www.sun.com if you need additional information or
+* have any questions.
+*
+*/
+# include "incls/_precompiled.incl"
+# include "incls/_threadService.cpp.incl"
+// TODO: we need to define a naming convention for perf counters
+// to distinguish counters for:
+//   - standard JSR174 use
+//   - Hotspot extension (public and committed)
+//   - Hotspot extension (private/internal and uncommitted)
+// Default is disabled.
+bool ThreadService::_thread_monitoring_contention_enabled = false;
+bool ThreadService::_thread_cpu_time_enabled = false;
+PerfCounter*  ThreadService::_total_threads_count = NULL;
+PerfVariable* ThreadService::_live_threads_count = NULL;
+PerfVariable* ThreadService::_peak_threads_count = NULL;
+PerfVariable* ThreadService::_daemon_threads_count = NULL;
+volatile int ThreadService::_exiting_threads_count = 0;
+volatile int ThreadService::_exiting_daemon_threads_count = 0;
+ThreadDumpResult* ThreadService::_threaddump_list = NULL;
+static const int INITIAL_ARRAY_SIZE = 10;
+void ThreadService::init() {
+EXCEPTION_MARK;
+// These counters are for java.lang.management API support.
+// They are created even if -XX:-UsePerfData is set and in
+// that case, they will be allocated on C heap.
+_total_threads_count =
+PerfDataManager::create_counter(JAVA_THREADS, "started",
+PerfData::U_Events, CHECK);
+_live_threads_count =
+PerfDataManager::create_variable(JAVA_THREADS, "live",
+PerfData::U_None, CHECK);
+_peak_threads_count =
+PerfDataManager::create_variable(JAVA_THREADS, "livePeak",
+PerfData::U_None, CHECK);
+_daemon_threads_count =
+PerfDataManager::create_variable(JAVA_THREADS, "daemon",
+PerfData::U_None, CHECK);
+if (os::is_thread_cpu_time_supported()) {
+_thread_cpu_time_enabled = true;
+}
+}
+void ThreadService::reset_peak_thread_count() {
+// Acquire the lock to update the peak thread count
+// to synchronize with thread addition and removal.
+MutexLockerEx mu(Threads_lock);
+_peak_threads_count->set_value(get_live_thread_count());
+}
+void ThreadService::add_thread(JavaThread* thread, bool daemon) {
+// Do not count VM internal or JVMTI agent threads
+if (thread->is_hidden_from_external_view() ||
+thread->is_jvmti_agent_thread()) {
+return;
+}
+_total_threads_count->inc();
+_live_threads_count->inc();
+if (_live_threads_count->get_value() > _peak_threads_count->get_value()) {
+_peak_threads_count->set_value(_live_threads_count->get_value());
+}
+if (daemon) {
+_daemon_threads_count->inc();
+}
+}
+void ThreadService::remove_thread(JavaThread* thread, bool daemon) {
+Atomic::dec((jint*) &_exiting_threads_count);
+if (thread->is_hidden_from_external_view() ||
+thread->is_jvmti_agent_thread()) {
+return;
+}
+_live_threads_count->set_value(_live_threads_count->get_value() - 1);
+if (daemon) {
+_daemon_threads_count->set_value(_daemon_threads_count->get_value() - 1);
+Atomic::dec((jint*) &_exiting_daemon_threads_count);
+}
+}
+void ThreadService::current_thread_exiting(JavaThread* jt) {
+assert(jt == JavaThread::current(), "Called by current thread");
+Atomic::inc((jint*) &_exiting_threads_count);
+oop threadObj = jt->threadObj();
+if (threadObj != NULL && java_lang_Thread::is_daemon(threadObj)) {
+Atomic::inc((jint*) &_exiting_daemon_threads_count);
+}
+}
+// FIXME: JVMTI should call this function
+Handle ThreadService::get_current_contended_monitor(JavaThread* thread) {
+assert(thread != NULL, "should be non-NULL");
+assert(Threads_lock->owned_by_self(), "must grab Threads_lock or be at safepoint");
+ObjectMonitor *wait_obj = thread->current_waiting_monitor();
+oop obj = NULL;
+if (wait_obj != NULL) {
+// thread is doing an Object.wait() call
+obj = (oop) wait_obj->object();
+assert(obj != NULL, "Object.wait() should have an object");
+} else {
+ObjectMonitor *enter_obj = thread->current_pending_monitor();
+if (enter_obj != NULL) {
+// thread is trying to enter() or raw_enter() an ObjectMonitor.
+obj = (oop) enter_obj->object();
+}
+// If obj == NULL, then ObjectMonitor is raw which doesn't count.
+}
+Handle h(obj);
+return h;
+}
+bool ThreadService::set_thread_monitoring_contention(bool flag) {
+MutexLocker m(Management_lock);
+bool prev = _thread_monitoring_contention_enabled;
+_thread_monitoring_contention_enabled = flag;
+return prev;
+}
+bool ThreadService::set_thread_cpu_time_enabled(bool flag) {
+MutexLocker m(Management_lock);
+bool prev = _thread_cpu_time_enabled;
+_thread_cpu_time_enabled = flag;
+return prev;
+}
+// GC support
+void ThreadService::oops_do(OopClosure* f) {
+for (ThreadDumpResult* dump = _threaddump_list; dump != NULL; dump = dump->next()) {
+dump->oops_do(f);
+}
+}
+void ThreadService::add_thread_dump(ThreadDumpResult* dump) {
+MutexLocker ml(Management_lock);
+if (_threaddump_list == NULL) {
+_threaddump_list = dump;
+} else {
+dump->set_next(_threaddump_list);
+_threaddump_list = dump;
+}
+}
+void ThreadService::remove_thread_dump(ThreadDumpResult* dump) {
+MutexLocker ml(Management_lock);
+ThreadDumpResult* prev = NULL;
+bool found = false;
+for (ThreadDumpResult* d = _threaddump_list; d != NULL; prev = d, d = d->next()) {
+if (d == dump) {
+if (prev == NULL) {
+_threaddump_list = dump->next();
+} else {
+prev->set_next(dump->next());
+}
+found = true;
+break;
+}
+}
+assert(found, "The threaddump result to be removed must exist.");
+}
+// Dump stack trace of threads specified in the given threads array.
+// Returns StackTraceElement[][] each element is the stack trace of a thread in
+// the corresponding entry in the given threads array
+Handle ThreadService::dump_stack_traces(GrowableArray<instanceHandle>* threads,
+int num_threads,
+TRAPS) {
+assert(num_threads > 0, "just checking");
+ThreadDumpResult dump_result;
+VM_ThreadDump op(&dump_result,
+threads,
+num_threads,
+-1,    /* entire stack */
+false, /* with locked monitors */
+false  /* with locked synchronizers */);
+VMThread::execute(&op);
+// Allocate the resulting StackTraceElement[][] object
+ResourceMark rm(THREAD);
+klassOop k = SystemDictionary::resolve_or_fail(vmSymbolHandles::java_lang_StackTraceElement_array(), true, CHECK_NH);
+objArrayKlassHandle ik (THREAD, k);
+objArrayOop r = oopFactory::new_objArray(ik(), num_threads, CHECK_NH);
+objArrayHandle result_obj(THREAD, r);
+int num_snapshots = dump_result.num_snapshots();
+assert(num_snapshots == num_threads, "Must have num_threads thread snapshots");
+int i = 0;
+for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; i++, ts = ts->next()) {
+ThreadStackTrace* stacktrace = ts->get_stack_trace();
+if (stacktrace == NULL) {
+// No stack trace
+result_obj->obj_at_put(i, NULL);
+} else {
+// Construct an array of java/lang/StackTraceElement object
+Handle backtrace_h = stacktrace->allocate_fill_stack_trace_element_array(CHECK_NH);
+result_obj->obj_at_put(i, backtrace_h());
+}
+}
+return result_obj;
+}
+void ThreadService::reset_contention_count_stat(JavaThread* thread) {
+ThreadStatistics* stat = thread->get_thread_stat();
+if (stat != NULL) {
+stat->reset_count_stat();
+}
+}
+void ThreadService::reset_contention_time_stat(JavaThread* thread) {
+ThreadStatistics* stat = thread->get_thread_stat();
+if (stat != NULL) {
+stat->reset_time_stat();
+}
+}
+// Find deadlocks involving object monitors and concurrent locks if concurrent_locks is true
+DeadlockCycle* ThreadService::find_deadlocks_at_safepoint(bool concurrent_locks) {
+// This code was modified from the original Threads::find_deadlocks code.
+int globalDfn = 0, thisDfn;
+ObjectMonitor* waitingToLockMonitor = NULL;
+oop waitingToLockBlocker = NULL;
+bool blocked_on_monitor = false;
+JavaThread *currentThread, *previousThread;
+int num_deadlocks = 0;
+for (JavaThread* p = Threads::first(); p != NULL; p = p->next()) {
+// Initialize the depth-first-number
+p->set_depth_first_number(-1);
+}
+DeadlockCycle* deadlocks = NULL;
+DeadlockCycle* last = NULL;
+DeadlockCycle* cycle = new DeadlockCycle();
+for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) {
+if (jt->depth_first_number() >= 0) {
+// this thread was already visited
+continue;
+}
+thisDfn = globalDfn;
+jt->set_depth_first_number(globalDfn++);
+previousThread = jt;
+currentThread = jt;
+cycle->reset();
+// When there is a deadlock, all the monitors involved in the dependency
+// cycle must be contended and heavyweight. So we only care about the
+// heavyweight monitor a thread is waiting to lock.
+waitingToLockMonitor = (ObjectMonitor*)jt->current_pending_monitor();
+if (concurrent_locks) {
+waitingToLockBlocker = jt->current_park_blocker();
+}
+while (waitingToLockMonitor != NULL || waitingToLockBlocker != NULL) {
+cycle->add_thread(currentThread);
+if (waitingToLockMonitor != NULL) {
+currentThread = Threads::owning_thread_from_monitor_owner((address)waitingToLockMonitor->owner(),
+false /* no locking needed */);
+} else {
+if (concurrent_locks) {
+if (waitingToLockBlocker->is_a(SystemDictionary::abstract_ownable_synchronizer_klass())) {
+oop threadObj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(waitingToLockBlocker);
+currentThread = threadObj != NULL ? java_lang_Thread::thread(threadObj) : NULL;
+} else {
+currentThread = NULL;
+}
+}
+}
+if (currentThread == NULL) {
+// No dependency on another thread
+break;
+}
+if (currentThread->depth_first_number() < 0) {
+// First visit to this thread
+currentThread->set_depth_first_number(globalDfn++);
+} else if (currentThread->depth_first_number() < thisDfn) {
+// Thread already visited, and not on a (new) cycle
+break;
+} else if (currentThread == previousThread) {
+// Self-loop, ignore
+break;
+} else {
+// We have a (new) cycle
+num_deadlocks++;
+cycle->set_deadlock(true);
+// add this cycle to the deadlocks list
+if (deadlocks == NULL) {
+deadlocks = cycle;
+} else {
+last->set_next(cycle);
+}
+last = cycle;
+cycle = new DeadlockCycle();
+break;
+}
+previousThread = currentThread;
+waitingToLockMonitor = (ObjectMonitor*)currentThread->current_pending_monitor();
+if (concurrent_locks) {
+waitingToLockBlocker = currentThread->current_park_blocker();
+}
+}
+}
+return deadlocks;
+}
+ThreadDumpResult::ThreadDumpResult() : _num_threads(0), _num_snapshots(0), _snapshots(NULL), _next(NULL), _last(NULL) {
+// Create a new ThreadDumpResult object and append to the list.
+// If GC happens before this function returns, methodOop
+// in the stack trace will be visited.
+ThreadService::add_thread_dump(this);
+}
+ThreadDumpResult::ThreadDumpResult(int num_threads) : _num_threads(num_threads), _num_snapshots(0), _snapshots(NULL), _next(NULL), _last(NULL) {
+// Create a new ThreadDumpResult object and append to the list.
+// If GC happens before this function returns, oops
+// will be visited.
+ThreadService::add_thread_dump(this);
+}
+ThreadDumpResult::~ThreadDumpResult() {
+ThreadService::remove_thread_dump(this);
+// free all the ThreadSnapshot objects created during
+// the VM_ThreadDump operation
+ThreadSnapshot* ts = _snapshots;
+while (ts != NULL) {
+ThreadSnapshot* p = ts;
+ts = ts->next();
+delete p;
+}
+}
+void ThreadDumpResult::add_thread_snapshot(ThreadSnapshot* ts) {
+assert(_num_threads == 0 || _num_snapshots < _num_threads,
+"_num_snapshots must be less than _num_threads");
+_num_snapshots++;
+if (_snapshots == NULL) {
+_snapshots = ts;
+} else {
+_last->set_next(ts);
+}
+_last = ts;
+}
+void ThreadDumpResult::oops_do(OopClosure* f) {
+for (ThreadSnapshot* ts = _snapshots; ts != NULL; ts = ts->next()) {
+ts->oops_do(f);
+}
+}
+StackFrameInfo::StackFrameInfo(javaVFrame* jvf, bool with_lock_info) {
+_method = jvf->method();
+_bci = jvf->bci();
+_locked_monitors = NULL;
+if (with_lock_info) {
+ResourceMark rm;
+GrowableArray<MonitorInfo*>* list = jvf->locked_monitors();
+int length = list->length();
+if (length > 0) {
+_locked_monitors = new (ResourceObj::C_HEAP) GrowableArray<oop>(length, true);
+for (int i = 0; i < length; i++) {
+MonitorInfo* monitor = list->at(i);
+assert(monitor->owner(), "This monitor must have an owning object");
+_locked_monitors->append(monitor->owner());
+}
+}
+}
+}
+void StackFrameInfo::oops_do(OopClosure* f) {
+f->do_oop((oop*) &_method);
+if (_locked_monitors != NULL) {
+int length = _locked_monitors->length();
+for (int i = 0; i < length; i++) {
+f->do_oop((oop*) _locked_monitors->adr_at(i));
+}
+}
+}
+void StackFrameInfo::print_on(outputStream* st) const {
+ResourceMark rm;
+java_lang_Throwable::print_stack_element(st, method(), bci());
+int len = (_locked_monitors != NULL ? _locked_monitors->length() : 0);
+for (int i = 0; i < len; i++) {
+oop o = _locked_monitors->at(i);
+instanceKlass* ik = instanceKlass::cast(o->klass());
+st->print_cr("\t- locked <" INTPTR_FORMAT "> (a %s)", (address)o, ik->external_name());
+}
+}
+// Iterate through monitor cache to find JNI locked monitors
+class InflatedMonitorsClosure: public MonitorClosure {
+private:
+ThreadStackTrace* _stack_trace;
+Thread* _thread;
+public:
+InflatedMonitorsClosure(Thread* t, ThreadStackTrace* st) {
+_thread = t;
+_stack_trace = st;
+}
+void do_monitor(ObjectMonitor* mid) {
+if (mid->owner() == _thread) {
+oop object = (oop) mid->object();
+if (!_stack_trace->is_owned_monitor_on_stack(object)) {
+_stack_trace->add_jni_locked_monitor(object);
+}
+}
+}
+};
+ThreadStackTrace::ThreadStackTrace(JavaThread* t, bool with_locked_monitors) {
+_thread = t;
+_frames = new (ResourceObj::C_HEAP) GrowableArray<StackFrameInfo*>(INITIAL_ARRAY_SIZE, true);
+_depth = 0;
+_with_locked_monitors = with_locked_monitors;
+if (_with_locked_monitors) {
+_jni_locked_monitors = new (ResourceObj::C_HEAP) GrowableArray<oop>(INITIAL_ARRAY_SIZE, true);
+} else {
+_jni_locked_monitors = NULL;
+}
+}
+ThreadStackTrace::~ThreadStackTrace() {
+for (int i = 0; i < _frames->length(); i++) {
+delete _frames->at(i);
+}
+delete _frames;
+if (_jni_locked_monitors != NULL) {
+delete _jni_locked_monitors;
+}
+}
+void ThreadStackTrace::dump_stack_at_safepoint(int maxDepth) {
+assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped");
+if (_thread->has_last_Java_frame()) {
+RegisterMap reg_map(_thread);
+vframe* start_vf = _thread->last_java_vframe(&reg_map);
+int count = 0;
+for (vframe* f = start_vf; f; f = f->sender() ) {
+if (f->is_java_frame()) {
+javaVFrame* jvf = javaVFrame::cast(f);
+add_stack_frame(jvf);
+count++;
+} else {
+// Ignore non-Java frames
+}
+if (maxDepth > 0 && count == maxDepth) {
+// Skip frames if more than maxDepth
+break;
+}
+}
+}
+if (_with_locked_monitors) {
+// Iterate inflated monitors and find monitors locked by this thread
+// not found in the stack
+InflatedMonitorsClosure imc(_thread, this);
+ObjectSynchronizer::monitors_iterate(&imc);
+}
+}
+bool ThreadStackTrace::is_owned_monitor_on_stack(oop object) {
+assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped");
+bool found = false;
+int num_frames = get_stack_depth();
+for (int depth = 0; depth < num_frames; depth++) {
+StackFrameInfo* frame = stack_frame_at(depth);
+int len = frame->num_locked_monitors();
+GrowableArray<oop>* locked_monitors = frame->locked_monitors();
+for (int j = 0; j < len; j++) {
+oop monitor = locked_monitors->at(j);
+assert(monitor != NULL && monitor->is_instance(), "must be a Java object");
+if (monitor == object) {
+found = true;
+break;
+}
+}
+}
+return found;
+}
+Handle ThreadStackTrace::allocate_fill_stack_trace_element_array(TRAPS) {
+klassOop k = SystemDictionary::stackTraceElement_klass();
+instanceKlassHandle ik(THREAD, k);
+// Allocate an array of java/lang/StackTraceElement object
+objArrayOop ste = oopFactory::new_objArray(ik(), _depth, CHECK_NH);
+objArrayHandle backtrace(THREAD, ste);
+for (int j = 0; j < _depth; j++) {
+StackFrameInfo* frame = _frames->at(j);
+methodHandle mh(THREAD, frame->method());
+oop element = java_lang_StackTraceElement::create(mh, frame->bci(), CHECK_NH);
+backtrace->obj_at_put(j, element);
+}
+return backtrace;
+}
+void ThreadStackTrace::add_stack_frame(javaVFrame* jvf) {
+StackFrameInfo* frame = new StackFrameInfo(jvf, _with_locked_monitors);
+_frames->append(frame);
+_depth++;
+}
+void ThreadStackTrace::oops_do(OopClosure* f) {
+int length = _frames->length();
+for (int i = 0; i < length; i++) {
+_frames->at(i)->oops_do(f);
+}
+length = (_jni_locked_monitors != NULL ? _jni_locked_monitors->length() : 0);
+for (int j = 0; j < length; j++) {
+f->do_oop((oop*) _jni_locked_monitors->adr_at(j));
+}
+}
+ConcurrentLocksDump::~ConcurrentLocksDump() {
+if (_retain_map_on_free) {
+return;
+}
+for (ThreadConcurrentLocks* t = _map; t != NULL;)  {
+ThreadConcurrentLocks* tcl = t;
+t = t->next();
+delete tcl;
+}
+}
+void ConcurrentLocksDump::dump_at_safepoint() {
+// dump all locked concurrent locks
+assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped");
+if (JDK_Version::is_gte_jdk16x_version()) {
+ResourceMark rm;
+GrowableArray<oop>* aos_objects = new GrowableArray<oop>(INITIAL_ARRAY_SIZE);
+// Find all instances of AbstractOwnableSynchronizer
+HeapInspection::find_instances_at_safepoint(SystemDictionary::abstract_ownable_synchronizer_klass(),
+aos_objects);
+// Build a map of thread to its owned AQS locks
+build_map(aos_objects);
+}
+}
+// build a map of JavaThread to all its owned AbstractOwnableSynchronizer
+void ConcurrentLocksDump::build_map(GrowableArray<oop>* aos_objects) {
+int length = aos_objects->length();
+for (int i = 0; i < length; i++) {
+oop o = aos_objects->at(i);
+oop owner_thread_obj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(o);
+if (owner_thread_obj != NULL) {
+JavaThread* thread = java_lang_Thread::thread(owner_thread_obj);
+assert(o->is_instance(), "Must be an instanceOop");
+add_lock(thread, (instanceOop) o);
+}
+}
+}
+void ConcurrentLocksDump::add_lock(JavaThread* thread, instanceOop o) {
+ThreadConcurrentLocks* tcl = thread_concurrent_locks(thread);
+if (tcl != NULL) {
+tcl->add_lock(o);
+return;
+}
+// First owned lock found for this thread
+tcl = new ThreadConcurrentLocks(thread);
+tcl->add_lock(o);
+if (_map == NULL) {
+_map = tcl;
+} else {
+_last->set_next(tcl);
+}
+_last = tcl;
+}
+ThreadConcurrentLocks* ConcurrentLocksDump::thread_concurrent_locks(JavaThread* thread) {
+for (ThreadConcurrentLocks* tcl = _map; tcl != NULL; tcl = tcl->next()) {
+if (tcl->java_thread() == thread) {
+return tcl;
+}
+}
+return NULL;
+}
+void ConcurrentLocksDump::print_locks_on(JavaThread* t, outputStream* st) {
+st->print_cr("   Locked ownable synchronizers:");
+ThreadConcurrentLocks* tcl = thread_concurrent_locks(t);
+GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
+if (locks == NULL || locks->is_empty()) {
+st->print_cr("\t- None");
+st->cr();
+return;
+}
+for (int i = 0; i < locks->length(); i++) {
+instanceOop obj = locks->at(i);
+instanceKlass* ik = instanceKlass::cast(obj->klass());
+st->print_cr("\t- <" INTPTR_FORMAT "> (a %s)", (address)obj, ik->external_name());
+}
+st->cr();
+}
+ThreadConcurrentLocks::ThreadConcurrentLocks(JavaThread* thread) {
+_thread = thread;
+_owned_locks = new (ResourceObj::C_HEAP) GrowableArray<instanceOop>(INITIAL_ARRAY_SIZE, true);
+_next = NULL;
+}
+ThreadConcurrentLocks::~ThreadConcurrentLocks() {
+delete _owned_locks;
+}
+void ThreadConcurrentLocks::add_lock(instanceOop o) {
+_owned_locks->append(o);
+}
+void ThreadConcurrentLocks::oops_do(OopClosure* f) {
+int length = _owned_locks->length();
+for (int i = 0; i < length; i++) {
+f->do_oop((oop*) _owned_locks->adr_at(i));
+}
+}
+ThreadStatistics::ThreadStatistics() {
+_contended_enter_count = 0;
+_monitor_wait_count = 0;
+_sleep_count = 0;
+_class_init_recursion_count = 0;
+_class_verify_recursion_count = 0;
+_count_pending_reset = false;
+_timer_pending_reset = false;
+}
+ThreadSnapshot::ThreadSnapshot(JavaThread* thread) {
+_thread = thread;
+_threadObj = thread->threadObj();
+_stack_trace = NULL;
+_concurrent_locks = NULL;
+_next = NULL;
+ThreadStatistics* stat = thread->get_thread_stat();
+_contended_enter_ticks = stat->contended_enter_ticks();
+_contended_enter_count = stat->contended_enter_count();
+_monitor_wait_ticks = stat->monitor_wait_ticks();
+_monitor_wait_count = stat->monitor_wait_count();
+_sleep_ticks = stat->sleep_ticks();
+_sleep_count = stat->sleep_count();
+_blocker_object = NULL;
+_blocker_object_owner = NULL;
+_thread_status = java_lang_Thread::get_thread_status(_threadObj);
+_is_ext_suspended = thread->is_being_ext_suspended();
+_is_in_native = (thread->thread_state() == _thread_in_native);
+if (_thread_status == java_lang_Thread::BLOCKED_ON_MONITOR_ENTER ||
+_thread_status == java_lang_Thread::IN_OBJECT_WAIT ||
+_thread_status == java_lang_Thread::IN_OBJECT_WAIT_TIMED) {
+Handle obj = ThreadService::get_current_contended_monitor(thread);
+if (obj() == NULL) {
+// monitor no longer exists; thread is not blocked
+_thread_status = java_lang_Thread::RUNNABLE;
+} else {
+_blocker_object = obj();
+JavaThread* owner = ObjectSynchronizer::get_lock_owner(obj, false);
+if ((owner == NULL && _thread_status == java_lang_Thread::BLOCKED_ON_MONITOR_ENTER)
+|| (owner != NULL && owner->is_attaching())) {
+// ownership information of the monitor is not available
+// (may no longer be owned or releasing to some other thread)
+// make this thread in RUNNABLE state.
+// And when the owner thread is in attaching state, the java thread
+// is not completely initialized. For example thread name and id
+// and may not be set, so hide the attaching thread.
+_thread_status = java_lang_Thread::RUNNABLE;
+_blocker_object = NULL;
+} else if (owner != NULL) {
+_blocker_object_owner = owner->threadObj();
+}
+}
+}
+// Support for JSR-166 locks
+if (JDK_Version::supports_thread_park_blocker() &&
+(_thread_status == java_lang_Thread::PARKED ||
+_thread_status == java_lang_Thread::PARKED_TIMED)) {
+_blocker_object = thread->current_park_blocker();
+if (_blocker_object != NULL && _blocker_object->is_a(SystemDictionary::abstract_ownable_synchronizer_klass())) {
+_blocker_object_owner = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(_blocker_object);
+}
+}
+}
+ThreadSnapshot::~ThreadSnapshot() {
+delete _stack_trace;
+delete _concurrent_locks;
+}
+void ThreadSnapshot::dump_stack_at_safepoint(int max_depth, bool with_locked_monitors) {
+_stack_trace = new ThreadStackTrace(_thread, with_locked_monitors);
+_stack_trace->dump_stack_at_safepoint(max_depth);
+}
+void ThreadSnapshot::oops_do(OopClosure* f) {
+f->do_oop(&_threadObj);
+f->do_oop(&_blocker_object);
+f->do_oop(&_blocker_object_owner);
+if (_stack_trace != NULL) {
+_stack_trace->oops_do(f);
+}
+if (_concurrent_locks != NULL) {
+_concurrent_locks->oops_do(f);
+}
+}
+DeadlockCycle::DeadlockCycle() {
+_is_deadlock = false;
+_threads = new (ResourceObj::C_HEAP) GrowableArray<JavaThread*>(INITIAL_ARRAY_SIZE, true);
+_next = NULL;
+}
+DeadlockCycle::~DeadlockCycle() {
+delete _threads;
+}
+void DeadlockCycle::print_on(outputStream* st) const {
+st->cr();
+st->print_cr("Found one Java-level deadlock:");
+st->print("=============================");
+JavaThread* currentThread;
+ObjectMonitor* waitingToLockMonitor;
+oop waitingToLockBlocker;
+int len = _threads->length();
+for (int i = 0; i < len; i++) {
+currentThread = _threads->at(i);
+waitingToLockMonitor = (ObjectMonitor*)currentThread->current_pending_monitor();
+waitingToLockBlocker = currentThread->current_park_blocker();
+st->cr();
+st->print_cr("\"%s\":", currentThread->get_thread_name());
+const char* owner_desc = ",\n  which is held by";
+if (waitingToLockMonitor != NULL) {
+st->print("  waiting to lock monitor " INTPTR_FORMAT, waitingToLockMonitor);
+oop obj = (oop)waitingToLockMonitor->object();
+if (obj != NULL) {
+st->print(" (object "INTPTR_FORMAT ", a %s)", (address)obj,
+(instanceKlass::cast(obj->klass()))->external_name());
+if (!currentThread->current_pending_monitor_is_from_java()) {
+owner_desc = "\n  in JNI, which is held by";
+}
+} else {
+// No Java object associated - a JVMTI raw monitor
+owner_desc = " (JVMTI raw monitor),\n  which is held by";
+}
+currentThread = Threads::owning_thread_from_monitor_owner(
+(address)waitingToLockMonitor->owner(), false /* no locking needed */);
+} else {
+st->print("  waiting for ownable synchronizer " INTPTR_FORMAT ", (a %s)",
+(address)waitingToLockBlocker,
+(instanceKlass::cast(waitingToLockBlocker->klass()))->external_name());
+assert(waitingToLockBlocker->is_a(SystemDictionary::abstract_ownable_synchronizer_klass()),
+"Must be an AbstractOwnableSynchronizer");
+oop ownerObj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(waitingToLockBlocker);
+currentThread = java_lang_Thread::thread(ownerObj);
+}
+st->print("%s \"%s\"", owner_desc, currentThread->get_thread_name());
+}
+st->cr();
+st->cr();
+// Print stack traces
+bool oldJavaMonitorsInStackTrace = JavaMonitorsInStackTrace;
+JavaMonitorsInStackTrace = true;
+st->print_cr("Java stack information for the threads listed above:");
+st->print_cr("===================================================");
+for (int j = 0; j < len; j++) {
+currentThread = _threads->at(j);
+st->print_cr("\"%s\":", currentThread->get_thread_name());
+currentThread->print_stack_on(st);
+}
+JavaMonitorsInStackTrace = oldJavaMonitorsInStackTrace;
+}
+ThreadsListEnumerator::ThreadsListEnumerator(Thread* cur_thread,
+bool include_jvmti_agent_threads,
+bool include_jni_attaching_threads) {
+assert(cur_thread == Thread::current(), "Check current thread");
+int init_size = ThreadService::get_live_thread_count();
+_threads_array = new GrowableArray<instanceHandle>(init_size);
+MutexLockerEx ml(Threads_lock);
+for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) {
+// skips JavaThreads in the process of exiting
+// and also skips VM internal JavaThreads
+// Threads in _thread_new or _thread_new_trans state are included.
+// i.e. threads have been started but not yet running.
+if (jt->threadObj() == NULL   ||
+jt->is_exiting() ||
+!java_lang_Thread::is_alive(jt->threadObj())   ||
+jt->is_hidden_from_external_view()) {
+continue;
+}
+// skip agent threads
+if (!include_jvmti_agent_threads && jt->is_jvmti_agent_thread()) {
+continue;
+}
+// skip jni threads in the process of attaching
+if (!include_jni_attaching_threads && jt->is_attaching()) {
+continue;
+}
+instanceHandle h(cur_thread, (instanceOop) jt->threadObj());
+_threads_array->append(h);
+}
+}

Mercurial > hg > truffle

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