mirror of
https://github.com/Tencent/MMKV.git
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guoling
100 lines
2.5 KiB
C++
100 lines
2.5 KiB
C++
/*
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* Tencent is pleased to support the open source community by making
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* MMKV available.
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*
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* Copyright (C) 2018 THL A29 Limited, a Tencent company.
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* All rights reserved.
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*
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* Licensed under the BSD 3-Clause License (the "License"); you may not use
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* this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* https://opensource.org/licenses/BSD-3-Clause
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "ThreadLock.h"
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#include "MMKVLog.h"
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#if MMKV_USING_PTHREAD
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using namespace std;
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namespace mmkv {
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ThreadLock::ThreadLock() : m_lock({}) {
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pthread_mutexattr_t attr;
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pthread_mutexattr_init(&attr);
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pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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pthread_mutex_init(&m_lock, &attr);
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pthread_mutexattr_destroy(&attr);
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}
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ThreadLock::~ThreadLock() {
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while (m_lockCount > 0) {
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auto ret = pthread_mutex_unlock(&m_lock);
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if (ret != 0) {
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MMKVError("fail to unlock %p while destroying, ret=%d, error=%s",
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&m_lock, ret, strerror(ret));
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break;
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}
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--m_lockCount;
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}
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auto ret = pthread_mutex_destroy(&m_lock);
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if (ret != 0) {
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MMKVError("fail to destroy %p, ret=%d, error=%s", &m_lock, ret, strerror(ret));
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}
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}
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void ThreadLock::lock() {
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auto ret = pthread_mutex_lock(&m_lock);
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if (ret != 0) {
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MMKVError("fail to lock %p, ret=%d, error=%s", &m_lock, ret, strerror(ret));
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return;
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}
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++m_lockCount;
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}
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void ThreadLock::unlock() {
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if (m_lockCount == 0) {
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MMKVError("attempt to unlock unowned lock %p", &m_lock);
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return;
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}
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--m_lockCount;
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auto ret = pthread_mutex_unlock(&m_lock);
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if (ret != 0) {
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++m_lockCount;
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MMKVError("fail to unlock %p, ret=%d, error=%s", &m_lock, ret, strerror(ret));
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return;
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}
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}
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bool ThreadLock::try_lock() {
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auto ret = pthread_mutex_trylock(&m_lock);
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if (ret == 0) {
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++m_lockCount;
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return true;
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}
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return false;
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}
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void ThreadLock::initialize() {
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return;
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}
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void ThreadLock::ThreadOnce(ThreadOnceToken_t *onceToken, void (*callback)()) {
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pthread_once(onceToken, callback);
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}
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} // namespace mmkv
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#endif // MMKV_USING_PTHREAD
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