vm/services/threadService.cpp

0N/A/*
1988N/A * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
0N/A * published by the Free Software Foundation.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
0N/A *
1472N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1472N/A * or visit www.oracle.com if you need additional information or have any
1472N/A * questions.
0N/A *
0N/A */
0N/A
1879N/A#include "precompiled.hpp"
1879N/A#include "classfile/systemDictionary.hpp"
1879N/A#include "memory/allocation.hpp"
1879N/A#include "memory/heapInspection.hpp"
1879N/A#include "memory/oopFactory.hpp"
1879N/A#include "oops/instanceKlass.hpp"
1879N/A#include "oops/oop.inline.hpp"
1879N/A#include "runtime/handles.inline.hpp"
1879N/A#include "runtime/init.hpp"
1879N/A#include "runtime/thread.hpp"
1879N/A#include "runtime/vframe.hpp"
1879N/A#include "runtime/vmThread.hpp"
1879N/A#include "runtime/vm_operations.hpp"
1879N/A#include "services/threadService.hpp"
0N/A
0N/A// TODO: we need to define a naming convention for perf counters
0N/A// to distinguish counters for:
0N/A//   - standard JSR174 use
0N/A//   - Hotspot extension (public and committed)
0N/A//   - Hotspot extension (private/internal and uncommitted)
0N/A
0N/A// Default is disabled.
0N/Abool ThreadService::_thread_monitoring_contention_enabled = false;
0N/Abool ThreadService::_thread_cpu_time_enabled = false;
1988N/Abool ThreadService::_thread_allocated_memory_enabled = false;
0N/A
0N/APerfCounter*  ThreadService::_total_threads_count = NULL;
0N/APerfVariable* ThreadService::_live_threads_count = NULL;
0N/APerfVariable* ThreadService::_peak_threads_count = NULL;
0N/APerfVariable* ThreadService::_daemon_threads_count = NULL;
0N/Avolatile int ThreadService::_exiting_threads_count = 0;
0N/Avolatile int ThreadService::_exiting_daemon_threads_count = 0;
0N/A
0N/AThreadDumpResult* ThreadService::_threaddump_list = NULL;
0N/A
0N/Astatic const int INITIAL_ARRAY_SIZE = 10;
0N/A
0N/Avoid ThreadService::init() {
0N/A  EXCEPTION_MARK;
0N/A
0N/A  // These counters are for java.lang.management API support.
0N/A  // They are created even if -XX:-UsePerfData is set and in
0N/A  // that case, they will be allocated on C heap.
0N/A
0N/A  _total_threads_count =
0N/A                PerfDataManager::create_counter(JAVA_THREADS, "started",
0N/A                                                PerfData::U_Events, CHECK);
0N/A
0N/A  _live_threads_count =
0N/A                PerfDataManager::create_variable(JAVA_THREADS, "live",
0N/A                                                 PerfData::U_None, CHECK);
0N/A
0N/A  _peak_threads_count =
0N/A                PerfDataManager::create_variable(JAVA_THREADS, "livePeak",
0N/A                                                 PerfData::U_None, CHECK);
0N/A
0N/A  _daemon_threads_count =
0N/A                PerfDataManager::create_variable(JAVA_THREADS, "daemon",
0N/A                                                 PerfData::U_None, CHECK);
0N/A
0N/A  if (os::is_thread_cpu_time_supported()) {
0N/A    _thread_cpu_time_enabled = true;
0N/A  }
1988N/A
1988N/A  _thread_allocated_memory_enabled = true; // Always on, so enable it
0N/A}
0N/A
0N/Avoid ThreadService::reset_peak_thread_count() {
0N/A  // Acquire the lock to update the peak thread count
0N/A  // to synchronize with thread addition and removal.
0N/A  MutexLockerEx mu(Threads_lock);
0N/A  _peak_threads_count->set_value(get_live_thread_count());
0N/A}
0N/A
0N/Avoid ThreadService::add_thread(JavaThread* thread, bool daemon) {
0N/A  // Do not count VM internal or JVMTI agent threads
0N/A  if (thread->is_hidden_from_external_view() ||
0N/A      thread->is_jvmti_agent_thread()) {
0N/A    return;
0N/A  }
0N/A
0N/A  _total_threads_count->inc();
0N/A  _live_threads_count->inc();
0N/A
0N/A  if (_live_threads_count->get_value() > _peak_threads_count->get_value()) {
0N/A    _peak_threads_count->set_value(_live_threads_count->get_value());
0N/A  }
0N/A
0N/A  if (daemon) {
0N/A    _daemon_threads_count->inc();
0N/A  }
0N/A}
0N/A
0N/Avoid ThreadService::remove_thread(JavaThread* thread, bool daemon) {
0N/A  Atomic::dec((jint*) &_exiting_threads_count);
0N/A
0N/A  if (thread->is_hidden_from_external_view() ||
0N/A      thread->is_jvmti_agent_thread()) {
0N/A    return;
0N/A  }
0N/A
0N/A  _live_threads_count->set_value(_live_threads_count->get_value() - 1);
0N/A
0N/A  if (daemon) {
0N/A    _daemon_threads_count->set_value(_daemon_threads_count->get_value() - 1);
0N/A    Atomic::dec((jint*) &_exiting_daemon_threads_count);
0N/A  }
0N/A}
0N/A
0N/Avoid ThreadService::current_thread_exiting(JavaThread* jt) {
0N/A  assert(jt == JavaThread::current(), "Called by current thread");
0N/A  Atomic::inc((jint*) &_exiting_threads_count);
0N/A
0N/A  oop threadObj = jt->threadObj();
0N/A  if (threadObj != NULL && java_lang_Thread::is_daemon(threadObj)) {
0N/A    Atomic::inc((jint*) &_exiting_daemon_threads_count);
0N/A  }
0N/A}
0N/A
0N/A// FIXME: JVMTI should call this function
0N/AHandle ThreadService::get_current_contended_monitor(JavaThread* thread) {
0N/A  assert(thread != NULL, "should be non-NULL");
0N/A  assert(Threads_lock->owned_by_self(), "must grab Threads_lock or be at safepoint");
0N/A
0N/A  ObjectMonitor *wait_obj = thread->current_waiting_monitor();
0N/A
0N/A  oop obj = NULL;
0N/A  if (wait_obj != NULL) {
0N/A    // thread is doing an Object.wait() call
0N/A    obj = (oop) wait_obj->object();
0N/A    assert(obj != NULL, "Object.wait() should have an object");
0N/A  } else {
0N/A    ObjectMonitor *enter_obj = thread->current_pending_monitor();
0N/A    if (enter_obj != NULL) {
0N/A      // thread is trying to enter() or raw_enter() an ObjectMonitor.
0N/A      obj = (oop) enter_obj->object();
0N/A    }
0N/A    // If obj == NULL, then ObjectMonitor is raw which doesn't count.
0N/A  }
0N/A
0N/A  Handle h(obj);
0N/A  return h;
0N/A}
0N/A
0N/Abool ThreadService::set_thread_monitoring_contention(bool flag) {
0N/A  MutexLocker m(Management_lock);
0N/A
0N/A  bool prev = _thread_monitoring_contention_enabled;
0N/A  _thread_monitoring_contention_enabled = flag;
0N/A
0N/A  return prev;
0N/A}
0N/A
0N/Abool ThreadService::set_thread_cpu_time_enabled(bool flag) {
0N/A  MutexLocker m(Management_lock);
0N/A
0N/A  bool prev = _thread_cpu_time_enabled;
0N/A  _thread_cpu_time_enabled = flag;
0N/A
0N/A  return prev;
0N/A}
0N/A
1988N/Abool ThreadService::set_thread_allocated_memory_enabled(bool flag) {
1988N/A  MutexLocker m(Management_lock);
1988N/A
1988N/A  bool prev = _thread_allocated_memory_enabled;
1988N/A  _thread_allocated_memory_enabled = flag;
1988N/A
1988N/A  return prev;
1988N/A}
1988N/A
0N/A// GC support
0N/Avoid ThreadService::oops_do(OopClosure* f) {
0N/A  for (ThreadDumpResult* dump = _threaddump_list; dump != NULL; dump = dump->next()) {
0N/A    dump->oops_do(f);
0N/A  }
0N/A}
0N/A
0N/Avoid ThreadService::add_thread_dump(ThreadDumpResult* dump) {
0N/A  MutexLocker ml(Management_lock);
0N/A  if (_threaddump_list == NULL) {
0N/A    _threaddump_list = dump;
0N/A  } else {
0N/A    dump->set_next(_threaddump_list);
0N/A    _threaddump_list = dump;
0N/A  }
0N/A}
0N/A
0N/Avoid ThreadService::remove_thread_dump(ThreadDumpResult* dump) {
0N/A  MutexLocker ml(Management_lock);
0N/A
0N/A  ThreadDumpResult* prev = NULL;
0N/A  bool found = false;
0N/A  for (ThreadDumpResult* d = _threaddump_list; d != NULL; prev = d, d = d->next()) {
0N/A    if (d == dump) {
0N/A      if (prev == NULL) {
0N/A        _threaddump_list = dump->next();
0N/A      } else {
0N/A        prev->set_next(dump->next());
0N/A      }
0N/A      found = true;
0N/A      break;
0N/A    }
0N/A  }
0N/A  assert(found, "The threaddump result to be removed must exist.");
0N/A}
0N/A
0N/A// Dump stack trace of threads specified in the given threads array.
0N/A// Returns StackTraceElement[][] each element is the stack trace of a thread in
0N/A// the corresponding entry in the given threads array
0N/AHandle ThreadService::dump_stack_traces(GrowableArray<instanceHandle>* threads,
0N/A                                        int num_threads,
0N/A                                        TRAPS) {
0N/A  assert(num_threads > 0, "just checking");
0N/A
0N/A  ThreadDumpResult dump_result;
0N/A  VM_ThreadDump op(&dump_result,
0N/A                   threads,
0N/A                   num_threads,
0N/A                   -1,    /* entire stack */
0N/A                   false, /* with locked monitors */
0N/A                   false  /* with locked synchronizers */);
0N/A  VMThread::execute(&op);
0N/A
0N/A  // Allocate the resulting StackTraceElement[][] object
0N/A
0N/A  ResourceMark rm(THREAD);
2062N/A  klassOop k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_StackTraceElement_array(), true, CHECK_NH);
0N/A  objArrayKlassHandle ik (THREAD, k);
0N/A  objArrayOop r = oopFactory::new_objArray(ik(), num_threads, CHECK_NH);
0N/A  objArrayHandle result_obj(THREAD, r);
0N/A
0N/A  int num_snapshots = dump_result.num_snapshots();
0N/A  assert(num_snapshots == num_threads, "Must have num_threads thread snapshots");
0N/A  int i = 0;
0N/A  for (ThreadSnapshot* ts = dump_result.snapshots(); ts != NULL; i++, ts = ts->next()) {
0N/A    ThreadStackTrace* stacktrace = ts->get_stack_trace();
0N/A    if (stacktrace == NULL) {
0N/A      // No stack trace
0N/A      result_obj->obj_at_put(i, NULL);
0N/A    } else {
0N/A      // Construct an array of java/lang/StackTraceElement object
0N/A      Handle backtrace_h = stacktrace->allocate_fill_stack_trace_element_array(CHECK_NH);
0N/A      result_obj->obj_at_put(i, backtrace_h());
0N/A    }
0N/A  }
0N/A
0N/A  return result_obj;
0N/A}
0N/A
0N/Avoid ThreadService::reset_contention_count_stat(JavaThread* thread) {
0N/A  ThreadStatistics* stat = thread->get_thread_stat();
0N/A  if (stat != NULL) {
0N/A    stat->reset_count_stat();
0N/A  }
0N/A}
0N/A
0N/Avoid ThreadService::reset_contention_time_stat(JavaThread* thread) {
0N/A  ThreadStatistics* stat = thread->get_thread_stat();
0N/A  if (stat != NULL) {
0N/A    stat->reset_time_stat();
0N/A  }
0N/A}
0N/A
0N/A// Find deadlocks involving object monitors and concurrent locks if concurrent_locks is true
0N/ADeadlockCycle* ThreadService::find_deadlocks_at_safepoint(bool concurrent_locks) {
0N/A  // This code was modified from the original Threads::find_deadlocks code.
0N/A  int globalDfn = 0, thisDfn;
0N/A  ObjectMonitor* waitingToLockMonitor = NULL;
0N/A  oop waitingToLockBlocker = NULL;
0N/A  bool blocked_on_monitor = false;
0N/A  JavaThread *currentThread, *previousThread;
0N/A  int num_deadlocks = 0;
0N/A
0N/A  for (JavaThread* p = Threads::first(); p != NULL; p = p->next()) {
0N/A    // Initialize the depth-first-number
0N/A    p->set_depth_first_number(-1);
0N/A  }
0N/A
0N/A  DeadlockCycle* deadlocks = NULL;
0N/A  DeadlockCycle* last = NULL;
0N/A  DeadlockCycle* cycle = new DeadlockCycle();
0N/A  for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) {
0N/A    if (jt->depth_first_number() >= 0) {
0N/A      // this thread was already visited
0N/A      continue;
0N/A    }
0N/A
0N/A    thisDfn = globalDfn;
0N/A    jt->set_depth_first_number(globalDfn++);
0N/A    previousThread = jt;
0N/A    currentThread = jt;
0N/A
0N/A    cycle->reset();
0N/A
0N/A    // When there is a deadlock, all the monitors involved in the dependency
0N/A    // cycle must be contended and heavyweight. So we only care about the
0N/A    // heavyweight monitor a thread is waiting to lock.
0N/A    waitingToLockMonitor = (ObjectMonitor*)jt->current_pending_monitor();
0N/A    if (concurrent_locks) {
0N/A      waitingToLockBlocker = jt->current_park_blocker();
0N/A    }
0N/A    while (waitingToLockMonitor != NULL || waitingToLockBlocker != NULL) {
0N/A      cycle->add_thread(currentThread);
0N/A      if (waitingToLockMonitor != NULL) {
0N/A        currentThread = Threads::owning_thread_from_monitor_owner((address)waitingToLockMonitor->owner(),
0N/A                                                                  false /* no locking needed */);
0N/A      } else {
0N/A        if (concurrent_locks) {
0N/A          if (waitingToLockBlocker->is_a(SystemDictionary::abstract_ownable_synchronizer_klass())) {
0N/A            oop threadObj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(waitingToLockBlocker);
0N/A            currentThread = threadObj != NULL ? java_lang_Thread::thread(threadObj) : NULL;
0N/A          } else {
0N/A            currentThread = NULL;
0N/A          }
0N/A        }
0N/A      }
0N/A
0N/A      if (currentThread == NULL) {
0N/A        // No dependency on another thread
0N/A        break;
0N/A      }
0N/A      if (currentThread->depth_first_number() < 0) {
0N/A        // First visit to this thread
0N/A        currentThread->set_depth_first_number(globalDfn++);
0N/A      } else if (currentThread->depth_first_number() < thisDfn) {
0N/A        // Thread already visited, and not on a (new) cycle
0N/A        break;
0N/A      } else if (currentThread == previousThread) {
0N/A        // Self-loop, ignore
0N/A        break;
0N/A      } else {
0N/A        // We have a (new) cycle
0N/A        num_deadlocks++;
0N/A
0N/A        cycle->set_deadlock(true);
0N/A
0N/A        // add this cycle to the deadlocks list
0N/A        if (deadlocks == NULL) {
0N/A          deadlocks = cycle;
0N/A        } else {
0N/A          last->set_next(cycle);
0N/A        }
0N/A        last = cycle;
0N/A        cycle = new DeadlockCycle();
0N/A        break;
0N/A      }
0N/A      previousThread = currentThread;
0N/A      waitingToLockMonitor = (ObjectMonitor*)currentThread->current_pending_monitor();
0N/A      if (concurrent_locks) {
0N/A        waitingToLockBlocker = currentThread->current_park_blocker();
0N/A      }
0N/A    }
0N/A
0N/A  }
3032N/A  delete cycle;
0N/A  return deadlocks;
0N/A}
0N/A
0N/AThreadDumpResult::ThreadDumpResult() : _num_threads(0), _num_snapshots(0), _snapshots(NULL), _next(NULL), _last(NULL) {
0N/A
0N/A  // Create a new ThreadDumpResult object and append to the list.
0N/A  // If GC happens before this function returns, methodOop
0N/A  // in the stack trace will be visited.
0N/A  ThreadService::add_thread_dump(this);
0N/A}
0N/A
0N/AThreadDumpResult::ThreadDumpResult(int num_threads) : _num_threads(num_threads), _num_snapshots(0), _snapshots(NULL), _next(NULL), _last(NULL) {
0N/A  // Create a new ThreadDumpResult object and append to the list.
0N/A  // If GC happens before this function returns, oops
0N/A  // will be visited.
0N/A  ThreadService::add_thread_dump(this);
0N/A}
0N/A
0N/AThreadDumpResult::~ThreadDumpResult() {
0N/A  ThreadService::remove_thread_dump(this);
0N/A
0N/A  // free all the ThreadSnapshot objects created during
0N/A  // the VM_ThreadDump operation
0N/A  ThreadSnapshot* ts = _snapshots;
0N/A  while (ts != NULL) {
0N/A    ThreadSnapshot* p = ts;
0N/A    ts = ts->next();
0N/A    delete p;
0N/A  }
0N/A}
0N/A
0N/A
0N/Avoid ThreadDumpResult::add_thread_snapshot(ThreadSnapshot* ts) {
0N/A  assert(_num_threads == 0 || _num_snapshots < _num_threads,
0N/A         "_num_snapshots must be less than _num_threads");
0N/A  _num_snapshots++;
0N/A  if (_snapshots == NULL) {
0N/A    _snapshots = ts;
0N/A  } else {
0N/A    _last->set_next(ts);
0N/A  }
0N/A  _last = ts;
0N/A}
0N/A
0N/Avoid ThreadDumpResult::oops_do(OopClosure* f) {
0N/A  for (ThreadSnapshot* ts = _snapshots; ts != NULL; ts = ts->next()) {
0N/A    ts->oops_do(f);
0N/A  }
0N/A}
0N/A
0N/AStackFrameInfo::StackFrameInfo(javaVFrame* jvf, bool with_lock_info) {
0N/A  _method = jvf->method();
0N/A  _bci = jvf->bci();
0N/A  _locked_monitors = NULL;
0N/A  if (with_lock_info) {
0N/A    ResourceMark rm;
0N/A    GrowableArray<MonitorInfo*>* list = jvf->locked_monitors();
0N/A    int length = list->length();
0N/A    if (length > 0) {
3863N/A      _locked_monitors = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(length, true);
0N/A      for (int i = 0; i < length; i++) {
0N/A        MonitorInfo* monitor = list->at(i);
0N/A        assert(monitor->owner(), "This monitor must have an owning object");
0N/A        _locked_monitors->append(monitor->owner());
0N/A      }
0N/A    }
0N/A  }
0N/A}
0N/A
0N/Avoid StackFrameInfo::oops_do(OopClosure* f) {
0N/A  f->do_oop((oop*) &_method);
0N/A  if (_locked_monitors != NULL) {
0N/A    int length = _locked_monitors->length();
0N/A    for (int i = 0; i < length; i++) {
0N/A      f->do_oop((oop*) _locked_monitors->adr_at(i));
0N/A    }
0N/A  }
0N/A}
0N/A
0N/Avoid StackFrameInfo::print_on(outputStream* st) const {
0N/A  ResourceMark rm;
0N/A  java_lang_Throwable::print_stack_element(st, method(), bci());
0N/A  int len = (_locked_monitors != NULL ? _locked_monitors->length() : 0);
0N/A  for (int i = 0; i < len; i++) {
0N/A    oop o = _locked_monitors->at(i);
0N/A    instanceKlass* ik = instanceKlass::cast(o->klass());
0N/A    st->print_cr("\t- locked <" INTPTR_FORMAT "> (a %s)", (address)o, ik->external_name());
0N/A  }
0N/A
0N/A}
0N/A
0N/A// Iterate through monitor cache to find JNI locked monitors
0N/Aclass InflatedMonitorsClosure: public MonitorClosure {
0N/Aprivate:
0N/A  ThreadStackTrace* _stack_trace;
0N/A  Thread* _thread;
0N/Apublic:
0N/A  InflatedMonitorsClosure(Thread* t, ThreadStackTrace* st) {
0N/A    _thread = t;
0N/A    _stack_trace = st;
0N/A  }
0N/A  void do_monitor(ObjectMonitor* mid) {
0N/A    if (mid->owner() == _thread) {
0N/A      oop object = (oop) mid->object();
0N/A      if (!_stack_trace->is_owned_monitor_on_stack(object)) {
0N/A        _stack_trace->add_jni_locked_monitor(object);
0N/A      }
0N/A    }
0N/A  }
0N/A};
0N/A
0N/AThreadStackTrace::ThreadStackTrace(JavaThread* t, bool with_locked_monitors) {
0N/A  _thread = t;
3863N/A  _frames = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<StackFrameInfo*>(INITIAL_ARRAY_SIZE, true);
0N/A  _depth = 0;
0N/A  _with_locked_monitors = with_locked_monitors;
0N/A  if (_with_locked_monitors) {
3863N/A    _jni_locked_monitors = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<oop>(INITIAL_ARRAY_SIZE, true);
0N/A  } else {
0N/A    _jni_locked_monitors = NULL;
0N/A  }
0N/A}
0N/A
0N/AThreadStackTrace::~ThreadStackTrace() {
0N/A  for (int i = 0; i < _frames->length(); i++) {
0N/A    delete _frames->at(i);
0N/A  }
0N/A  delete _frames;
0N/A  if (_jni_locked_monitors != NULL) {
0N/A    delete _jni_locked_monitors;
0N/A  }
0N/A}
0N/A
0N/Avoid ThreadStackTrace::dump_stack_at_safepoint(int maxDepth) {
0N/A  assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped");
0N/A
0N/A  if (_thread->has_last_Java_frame()) {
0N/A    RegisterMap reg_map(_thread);
0N/A    vframe* start_vf = _thread->last_java_vframe(&reg_map);
0N/A    int count = 0;
0N/A    for (vframe* f = start_vf; f; f = f->sender() ) {
0N/A      if (f->is_java_frame()) {
0N/A        javaVFrame* jvf = javaVFrame::cast(f);
0N/A        add_stack_frame(jvf);
0N/A        count++;
0N/A      } else {
0N/A        // Ignore non-Java frames
0N/A      }
0N/A      if (maxDepth > 0 && count == maxDepth) {
0N/A        // Skip frames if more than maxDepth
0N/A        break;
0N/A      }
0N/A    }
0N/A  }
0N/A
0N/A  if (_with_locked_monitors) {
0N/A    // Iterate inflated monitors and find monitors locked by this thread
0N/A    // not found in the stack
0N/A    InflatedMonitorsClosure imc(_thread, this);
0N/A    ObjectSynchronizer::monitors_iterate(&imc);
0N/A  }
0N/A}
0N/A
0N/A
0N/Abool ThreadStackTrace::is_owned_monitor_on_stack(oop object) {
0N/A  assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped");
0N/A
0N/A  bool found = false;
0N/A  int num_frames = get_stack_depth();
0N/A  for (int depth = 0; depth < num_frames; depth++) {
0N/A    StackFrameInfo* frame = stack_frame_at(depth);
0N/A    int len = frame->num_locked_monitors();
0N/A    GrowableArray<oop>* locked_monitors = frame->locked_monitors();
0N/A    for (int j = 0; j < len; j++) {
0N/A      oop monitor = locked_monitors->at(j);
0N/A      assert(monitor != NULL && monitor->is_instance(), "must be a Java object");
0N/A      if (monitor == object) {
0N/A        found = true;
0N/A        break;
0N/A      }
0N/A    }
0N/A  }
0N/A  return found;
0N/A}
0N/A
0N/AHandle ThreadStackTrace::allocate_fill_stack_trace_element_array(TRAPS) {
1142N/A  klassOop k = SystemDictionary::StackTraceElement_klass();
132N/A  assert(k != NULL, "must be loaded in 1.4+");
0N/A  instanceKlassHandle ik(THREAD, k);
0N/A
0N/A  // Allocate an array of java/lang/StackTraceElement object
0N/A  objArrayOop ste = oopFactory::new_objArray(ik(), _depth, CHECK_NH);
0N/A  objArrayHandle backtrace(THREAD, ste);
0N/A  for (int j = 0; j < _depth; j++) {
0N/A    StackFrameInfo* frame = _frames->at(j);
0N/A    methodHandle mh(THREAD, frame->method());
0N/A    oop element = java_lang_StackTraceElement::create(mh, frame->bci(), CHECK_NH);
0N/A    backtrace->obj_at_put(j, element);
0N/A  }
0N/A  return backtrace;
0N/A}
0N/A
0N/Avoid ThreadStackTrace::add_stack_frame(javaVFrame* jvf) {
0N/A  StackFrameInfo* frame = new StackFrameInfo(jvf, _with_locked_monitors);
0N/A  _frames->append(frame);
0N/A  _depth++;
0N/A}
0N/A
0N/Avoid ThreadStackTrace::oops_do(OopClosure* f) {
0N/A  int length = _frames->length();
0N/A  for (int i = 0; i < length; i++) {
0N/A    _frames->at(i)->oops_do(f);
0N/A  }
0N/A
0N/A  length = (_jni_locked_monitors != NULL ? _jni_locked_monitors->length() : 0);
0N/A  for (int j = 0; j < length; j++) {
0N/A    f->do_oop((oop*) _jni_locked_monitors->adr_at(j));
0N/A  }
0N/A}
0N/A
0N/AConcurrentLocksDump::~ConcurrentLocksDump() {
0N/A  if (_retain_map_on_free) {
0N/A    return;
0N/A  }
0N/A
0N/A  for (ThreadConcurrentLocks* t = _map; t != NULL;)  {
0N/A    ThreadConcurrentLocks* tcl = t;
0N/A    t = t->next();
0N/A    delete tcl;
0N/A  }
0N/A}
0N/A
0N/Avoid ConcurrentLocksDump::dump_at_safepoint() {
0N/A  // dump all locked concurrent locks
0N/A  assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped");
0N/A
0N/A  if (JDK_Version::is_gte_jdk16x_version()) {
0N/A    ResourceMark rm;
0N/A
0N/A    GrowableArray<oop>* aos_objects = new GrowableArray<oop>(INITIAL_ARRAY_SIZE);
0N/A
0N/A    // Find all instances of AbstractOwnableSynchronizer
0N/A    HeapInspection::find_instances_at_safepoint(SystemDictionary::abstract_ownable_synchronizer_klass(),
0N/A                                                aos_objects);
0N/A    // Build a map of thread to its owned AQS locks
0N/A    build_map(aos_objects);
0N/A  }
0N/A}
0N/A
0N/A
0N/A// build a map of JavaThread to all its owned AbstractOwnableSynchronizer
0N/Avoid ConcurrentLocksDump::build_map(GrowableArray<oop>* aos_objects) {
0N/A  int length = aos_objects->length();
0N/A  for (int i = 0; i < length; i++) {
0N/A    oop o = aos_objects->at(i);
0N/A    oop owner_thread_obj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(o);
0N/A    if (owner_thread_obj != NULL) {
0N/A      JavaThread* thread = java_lang_Thread::thread(owner_thread_obj);
0N/A      assert(o->is_instance(), "Must be an instanceOop");
0N/A      add_lock(thread, (instanceOop) o);
0N/A    }
0N/A  }
0N/A}
0N/A
0N/Avoid ConcurrentLocksDump::add_lock(JavaThread* thread, instanceOop o) {
0N/A  ThreadConcurrentLocks* tcl = thread_concurrent_locks(thread);
0N/A  if (tcl != NULL) {
0N/A    tcl->add_lock(o);
0N/A    return;
0N/A  }
0N/A
0N/A  // First owned lock found for this thread
0N/A  tcl = new ThreadConcurrentLocks(thread);
0N/A  tcl->add_lock(o);
0N/A  if (_map == NULL) {
0N/A    _map = tcl;
0N/A  } else {
0N/A    _last->set_next(tcl);
0N/A  }
0N/A  _last = tcl;
0N/A}
0N/A
0N/AThreadConcurrentLocks* ConcurrentLocksDump::thread_concurrent_locks(JavaThread* thread) {
0N/A  for (ThreadConcurrentLocks* tcl = _map; tcl != NULL; tcl = tcl->next()) {
0N/A    if (tcl->java_thread() == thread) {
0N/A      return tcl;
0N/A    }
0N/A  }
0N/A  return NULL;
0N/A}
0N/A
0N/Avoid ConcurrentLocksDump::print_locks_on(JavaThread* t, outputStream* st) {
0N/A  st->print_cr("   Locked ownable synchronizers:");
0N/A  ThreadConcurrentLocks* tcl = thread_concurrent_locks(t);
0N/A  GrowableArray<instanceOop>* locks = (tcl != NULL ? tcl->owned_locks() : NULL);
0N/A  if (locks == NULL || locks->is_empty()) {
0N/A    st->print_cr("\t- None");
0N/A    st->cr();
0N/A    return;
0N/A  }
0N/A
0N/A  for (int i = 0; i < locks->length(); i++) {
0N/A    instanceOop obj = locks->at(i);
0N/A    instanceKlass* ik = instanceKlass::cast(obj->klass());
0N/A    st->print_cr("\t- <" INTPTR_FORMAT "> (a %s)", (address)obj, ik->external_name());
0N/A  }
0N/A  st->cr();
0N/A}
0N/A
0N/AThreadConcurrentLocks::ThreadConcurrentLocks(JavaThread* thread) {
0N/A  _thread = thread;
3863N/A  _owned_locks = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<instanceOop>(INITIAL_ARRAY_SIZE, true);
0N/A  _next = NULL;
0N/A}
0N/A
0N/AThreadConcurrentLocks::~ThreadConcurrentLocks() {
0N/A  delete _owned_locks;
0N/A}
0N/A
0N/Avoid ThreadConcurrentLocks::add_lock(instanceOop o) {
0N/A  _owned_locks->append(o);
0N/A}
0N/A
0N/Avoid ThreadConcurrentLocks::oops_do(OopClosure* f) {
0N/A  int length = _owned_locks->length();
0N/A  for (int i = 0; i < length; i++) {
0N/A    f->do_oop((oop*) _owned_locks->adr_at(i));
0N/A  }
0N/A}
0N/A
0N/AThreadStatistics::ThreadStatistics() {
0N/A  _contended_enter_count = 0;
0N/A  _monitor_wait_count = 0;
0N/A  _sleep_count = 0;
0N/A  _count_pending_reset = false;
0N/A  _timer_pending_reset = false;
875N/A  memset((void*) _perf_recursion_counts, 0, sizeof(_perf_recursion_counts));
0N/A}
0N/A
0N/AThreadSnapshot::ThreadSnapshot(JavaThread* thread) {
0N/A  _thread = thread;
0N/A  _threadObj = thread->threadObj();
0N/A  _stack_trace = NULL;
0N/A  _concurrent_locks = NULL;
0N/A  _next = NULL;
0N/A
0N/A  ThreadStatistics* stat = thread->get_thread_stat();
0N/A  _contended_enter_ticks = stat->contended_enter_ticks();
0N/A  _contended_enter_count = stat->contended_enter_count();
0N/A  _monitor_wait_ticks = stat->monitor_wait_ticks();
0N/A  _monitor_wait_count = stat->monitor_wait_count();
0N/A  _sleep_ticks = stat->sleep_ticks();
0N/A  _sleep_count = stat->sleep_count();
0N/A
0N/A  _blocker_object = NULL;
0N/A  _blocker_object_owner = NULL;
0N/A
0N/A  _thread_status = java_lang_Thread::get_thread_status(_threadObj);
0N/A  _is_ext_suspended = thread->is_being_ext_suspended();
0N/A  _is_in_native = (thread->thread_state() == _thread_in_native);
0N/A
0N/A  if (_thread_status == java_lang_Thread::BLOCKED_ON_MONITOR_ENTER ||
0N/A      _thread_status == java_lang_Thread::IN_OBJECT_WAIT ||
0N/A      _thread_status == java_lang_Thread::IN_OBJECT_WAIT_TIMED) {
0N/A
0N/A    Handle obj = ThreadService::get_current_contended_monitor(thread);
0N/A    if (obj() == NULL) {
0N/A      // monitor no longer exists; thread is not blocked
0N/A      _thread_status = java_lang_Thread::RUNNABLE;
0N/A    } else {
0N/A      _blocker_object = obj();
0N/A      JavaThread* owner = ObjectSynchronizer::get_lock_owner(obj, false);
0N/A      if ((owner == NULL && _thread_status == java_lang_Thread::BLOCKED_ON_MONITOR_ENTER)
2842N/A          || (owner != NULL && owner->is_attaching_via_jni())) {
0N/A        // ownership information of the monitor is not available
0N/A        // (may no longer be owned or releasing to some other thread)
0N/A        // make this thread in RUNNABLE state.
0N/A        // And when the owner thread is in attaching state, the java thread
0N/A        // is not completely initialized. For example thread name and id
0N/A        // and may not be set, so hide the attaching thread.
0N/A        _thread_status = java_lang_Thread::RUNNABLE;
0N/A        _blocker_object = NULL;
0N/A      } else if (owner != NULL) {
0N/A        _blocker_object_owner = owner->threadObj();
0N/A      }
0N/A    }
0N/A  }
0N/A
0N/A  // Support for JSR-166 locks
242N/A  if (JDK_Version::current().supports_thread_park_blocker() &&
0N/A        (_thread_status == java_lang_Thread::PARKED ||
0N/A         _thread_status == java_lang_Thread::PARKED_TIMED)) {
0N/A
0N/A    _blocker_object = thread->current_park_blocker();
0N/A    if (_blocker_object != NULL && _blocker_object->is_a(SystemDictionary::abstract_ownable_synchronizer_klass())) {
0N/A      _blocker_object_owner = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(_blocker_object);
0N/A    }
0N/A  }
0N/A}
0N/A
0N/AThreadSnapshot::~ThreadSnapshot() {
0N/A  delete _stack_trace;
0N/A  delete _concurrent_locks;
0N/A}
0N/A
0N/Avoid ThreadSnapshot::dump_stack_at_safepoint(int max_depth, bool with_locked_monitors) {
0N/A  _stack_trace = new ThreadStackTrace(_thread, with_locked_monitors);
0N/A  _stack_trace->dump_stack_at_safepoint(max_depth);
0N/A}
0N/A
0N/A
0N/Avoid ThreadSnapshot::oops_do(OopClosure* f) {
0N/A  f->do_oop(&_threadObj);
0N/A  f->do_oop(&_blocker_object);
0N/A  f->do_oop(&_blocker_object_owner);
0N/A  if (_stack_trace != NULL) {
0N/A    _stack_trace->oops_do(f);
0N/A  }
0N/A  if (_concurrent_locks != NULL) {
0N/A    _concurrent_locks->oops_do(f);
0N/A  }
0N/A}
0N/A
0N/ADeadlockCycle::DeadlockCycle() {
0N/A  _is_deadlock = false;
3863N/A  _threads = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<JavaThread*>(INITIAL_ARRAY_SIZE, true);
0N/A  _next = NULL;
0N/A}
0N/A
0N/ADeadlockCycle::~DeadlockCycle() {
0N/A  delete _threads;
0N/A}
0N/A
0N/Avoid DeadlockCycle::print_on(outputStream* st) const {
0N/A  st->cr();
0N/A  st->print_cr("Found one Java-level deadlock:");
0N/A  st->print("=============================");
0N/A
0N/A  JavaThread* currentThread;
0N/A  ObjectMonitor* waitingToLockMonitor;
0N/A  oop waitingToLockBlocker;
0N/A  int len = _threads->length();
0N/A  for (int i = 0; i < len; i++) {
0N/A    currentThread = _threads->at(i);
0N/A    waitingToLockMonitor = (ObjectMonitor*)currentThread->current_pending_monitor();
0N/A    waitingToLockBlocker = currentThread->current_park_blocker();
0N/A    st->cr();
0N/A    st->print_cr("\"%s\":", currentThread->get_thread_name());
0N/A    const char* owner_desc = ",\n  which is held by";
0N/A    if (waitingToLockMonitor != NULL) {
0N/A      st->print("  waiting to lock monitor " INTPTR_FORMAT, waitingToLockMonitor);
0N/A      oop obj = (oop)waitingToLockMonitor->object();
0N/A      if (obj != NULL) {
0N/A        st->print(" (object "INTPTR_FORMAT ", a %s)", (address)obj,
0N/A                   (instanceKlass::cast(obj->klass()))->external_name());
0N/A
0N/A        if (!currentThread->current_pending_monitor_is_from_java()) {
0N/A          owner_desc = "\n  in JNI, which is held by";
0N/A        }
0N/A      } else {
0N/A        // No Java object associated - a JVMTI raw monitor
0N/A        owner_desc = " (JVMTI raw monitor),\n  which is held by";
0N/A      }
0N/A      currentThread = Threads::owning_thread_from_monitor_owner(
0N/A        (address)waitingToLockMonitor->owner(), false /* no locking needed */);
0N/A    } else {
0N/A      st->print("  waiting for ownable synchronizer " INTPTR_FORMAT ", (a %s)",
0N/A                (address)waitingToLockBlocker,
0N/A                (instanceKlass::cast(waitingToLockBlocker->klass()))->external_name());
0N/A      assert(waitingToLockBlocker->is_a(SystemDictionary::abstract_ownable_synchronizer_klass()),
0N/A             "Must be an AbstractOwnableSynchronizer");
0N/A      oop ownerObj = java_util_concurrent_locks_AbstractOwnableSynchronizer::get_owner_threadObj(waitingToLockBlocker);
0N/A      currentThread = java_lang_Thread::thread(ownerObj);
0N/A    }
0N/A    st->print("%s \"%s\"", owner_desc, currentThread->get_thread_name());
0N/A  }
0N/A
0N/A  st->cr();
0N/A  st->cr();
0N/A
0N/A  // Print stack traces
0N/A  bool oldJavaMonitorsInStackTrace = JavaMonitorsInStackTrace;
0N/A  JavaMonitorsInStackTrace = true;
0N/A  st->print_cr("Java stack information for the threads listed above:");
0N/A  st->print_cr("===================================================");
0N/A  for (int j = 0; j < len; j++) {
0N/A    currentThread = _threads->at(j);
0N/A    st->print_cr("\"%s\":", currentThread->get_thread_name());
0N/A    currentThread->print_stack_on(st);
0N/A  }
0N/A  JavaMonitorsInStackTrace = oldJavaMonitorsInStackTrace;
0N/A}
0N/A
0N/AThreadsListEnumerator::ThreadsListEnumerator(Thread* cur_thread,
0N/A                                             bool include_jvmti_agent_threads,
0N/A                                             bool include_jni_attaching_threads) {
0N/A  assert(cur_thread == Thread::current(), "Check current thread");
0N/A
0N/A  int init_size = ThreadService::get_live_thread_count();
0N/A  _threads_array = new GrowableArray<instanceHandle>(init_size);
0N/A
0N/A  MutexLockerEx ml(Threads_lock);
0N/A
0N/A  for (JavaThread* jt = Threads::first(); jt != NULL; jt = jt->next()) {
0N/A    // skips JavaThreads in the process of exiting
0N/A    // and also skips VM internal JavaThreads
0N/A    // Threads in _thread_new or _thread_new_trans state are included.
0N/A    // i.e. threads have been started but not yet running.
0N/A    if (jt->threadObj() == NULL   ||
0N/A        jt->is_exiting() ||
0N/A        !java_lang_Thread::is_alive(jt->threadObj())   ||
0N/A        jt->is_hidden_from_external_view()) {
0N/A      continue;
0N/A    }
0N/A
0N/A    // skip agent threads
0N/A    if (!include_jvmti_agent_threads && jt->is_jvmti_agent_thread()) {
0N/A      continue;
0N/A    }
0N/A
0N/A    // skip jni threads in the process of attaching
2842N/A    if (!include_jni_attaching_threads && jt->is_attaching_via_jni()) {
0N/A      continue;
0N/A    }
0N/A
0N/A    instanceHandle h(cur_thread, (instanceOop) jt->threadObj());
0N/A    _threads_array->append(h);
0N/A  }
0N/A}