99 lines
2.4 KiB
C++
99 lines
2.4 KiB
C++
/*
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* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#ifndef SHARE_GC_Z_ZLOCK_INLINE_HPP
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#define SHARE_GC_Z_ZLOCK_INLINE_HPP
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#include "gc/z/zLock.hpp"
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#include "runtime/atomic.hpp"
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#include "runtime/thread.hpp"
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#include "utilities/debug.hpp"
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inline ZLock::ZLock() {
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pthread_mutex_init(&_lock, NULL);
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}
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inline ZLock::~ZLock() {
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pthread_mutex_destroy(&_lock);
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}
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inline void ZLock::lock() {
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pthread_mutex_lock(&_lock);
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}
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inline bool ZLock::try_lock() {
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return pthread_mutex_trylock(&_lock) == 0;
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}
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inline void ZLock::unlock() {
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pthread_mutex_unlock(&_lock);
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}
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inline ZReentrantLock::ZReentrantLock() :
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_lock(),
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_owner(NULL),
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_count(0) {}
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inline void ZReentrantLock::lock() {
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Thread* const thread = Thread::current();
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Thread* const owner = Atomic::load(&_owner);
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if (owner != thread) {
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_lock.lock();
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Atomic::store(thread, &_owner);
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}
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_count++;
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}
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inline void ZReentrantLock::unlock() {
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assert(is_owned(), "Invalid owner");
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assert(_count > 0, "Invalid count");
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_count--;
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if (_count == 0) {
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Atomic::store((Thread*)NULL, &_owner);
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_lock.unlock();
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}
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}
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inline bool ZReentrantLock::is_owned() const {
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Thread* const thread = Thread::current();
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Thread* const owner = Atomic::load(&_owner);
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return owner == thread;
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}
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template <typename T>
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inline ZLocker<T>::ZLocker(T* lock) :
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_lock(lock) {
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_lock->lock();
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}
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template <typename T>
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inline ZLocker<T>::~ZLocker() {
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_lock->unlock();
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}
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#endif // SHARE_GC_Z_ZLOCK_INLINE_HPP
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