84 lines
2.3 KiB
C++
84 lines
2.3 KiB
C++
/*
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* Copyright (c) 2019, Red Hat, Inc. 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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*/
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#include "precompiled.hpp"
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#include "runtime/os.hpp"
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#include "gc/shenandoah/shenandoahLock.hpp"
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#include "runtime/atomic.hpp"
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#include "runtime/os.inline.hpp"
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#include "runtime/thread.hpp"
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ShenandoahSimpleLock::ShenandoahSimpleLock() {
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assert(os::mutex_init_done(), "Too early!");
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}
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void ShenandoahSimpleLock::lock() {
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_lock.lock();
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}
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void ShenandoahSimpleLock::unlock() {
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_lock.unlock();
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}
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ShenandoahReentrantLock::ShenandoahReentrantLock() :
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ShenandoahSimpleLock(), _owner(NULL), _count(0) {
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assert(os::mutex_init_done(), "Too early!");
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}
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ShenandoahReentrantLock::~ShenandoahReentrantLock() {
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assert(_count == 0, "Unbalance");
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}
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void ShenandoahReentrantLock::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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ShenandoahSimpleLock::lock();
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Atomic::store(&_owner, thread);
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}
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_count++;
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}
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void ShenandoahReentrantLock::unlock() {
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assert(owned_by_self(), "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(&_owner, (Thread*)NULL);
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ShenandoahSimpleLock::unlock();
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}
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}
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bool ShenandoahReentrantLock::owned_by_self() 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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