src/hotspot/share/prims/jvmtiThreadState.inline.hpp - master - githubmirror/jdk11u-dev

src/hotspot/share/prims/jvmtiThreadState.inline.hpp
98 строк3 KB
Daniel D. Daugherty
8167108: inconsistent handling of SR_lock can lead to crashes
23 ноя 2017, 04:54
23 ноя 2017, 04:540dff96f
/*
 * Copyright (c) 2006, 2017, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#ifndef SHARE_VM_PRIMS_JVMTITHREADSTATE_INLINE_HPP
#define SHARE_VM_PRIMS_JVMTITHREADSTATE_INLINE_HPP

#include "prims/jvmtiEnvThreadState.hpp"
#include "prims/jvmtiThreadState.hpp"
#include "runtime/thread.inline.hpp"

// JvmtiEnvThreadStateIterator implementation

inline JvmtiEnvThreadStateIterator::JvmtiEnvThreadStateIterator(JvmtiThreadState* thread_state) {
  state = thread_state;
  Thread::current()->entering_jvmti_env_iteration();
}

inline JvmtiEnvThreadStateIterator::~JvmtiEnvThreadStateIterator() {
  Thread::current()->leaving_jvmti_env_iteration();
}

inline JvmtiEnvThreadState* JvmtiEnvThreadStateIterator::first() {
  return state->head_env_thread_state();
}

inline JvmtiEnvThreadState* JvmtiEnvThreadStateIterator::next(JvmtiEnvThreadState* ets) {
  return ets->next();
}

// JvmtiThreadState implementation

JvmtiEnvThreadState* JvmtiThreadState::env_thread_state(JvmtiEnvBase *env) {
  JvmtiEnvThreadStateIterator it(this);
  for (JvmtiEnvThreadState* ets = it.first(); ets != NULL; ets = it.next(ets)) {
    if ((JvmtiEnvBase*)(ets->get_env()) == env) {
      return ets;
    }
  }
  return NULL;
}

JvmtiEnvThreadState* JvmtiThreadState::head_env_thread_state() {
  return _head_env_thread_state;
}

void JvmtiThreadState::set_head_env_thread_state(JvmtiEnvThreadState* ets) {
  _head_env_thread_state = ets;
}

inline JvmtiThreadState* JvmtiThreadState::state_for_while_locked(JavaThread *thread) {
  assert(JvmtiThreadState_lock->is_locked(), "sanity check");

  JvmtiThreadState *state = thread->jvmti_thread_state();
  if (state == NULL) {
    if (thread->is_exiting()) {
      // don't add a JvmtiThreadState to a thread that is exiting
      return NULL;
    }

    state = new JvmtiThreadState(thread);
  }
  return state;
}

inline JvmtiThreadState* JvmtiThreadState::state_for(JavaThread *thread) {
  JvmtiThreadState *state = thread->jvmti_thread_state();
  if (state == NULL) {
    MutexLocker mu(JvmtiThreadState_lock);
    // check again with the lock held
    state = state_for_while_locked(thread);
  } else {
    CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops());
  }
  return state;
}

#endif // SHARE_VM_PRIMS_JVMTITHREADSTATE_INLINE_HPP