tars源码漫谈第25篇------tc_thread_rwlock.h/tc_thread_rwlock.cpp（读写锁）

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      tc_thread_rwlock里面的类TC_ThreadRWLocker是对读写锁操作的封装。 而读写锁， 是linux中非常基本的概念， 在某次面试的时候， 我还被问到过。

      来看看：

/*** Tencent is pleased to support the open source community by making Tars available.** Copyright (C) 2016THL A29 Limited, a Tencent company. All rights reserved.** Licensed under the BSD 3-Clause License (the "License"); you may not use this file except * in compliance with the License. You may obtain a copy of the License at** https://opensource.org/licenses/BSD-3-Clause** Unless required by applicable law or agreed to in writing, software distributed * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR * CONDITIONS OF ANY KIND, either express or implied. See the License for the * specific language governing permissions and limitations under the License.*/#include "util/tc_thread_rwlock.h"
#include <string.h>
#include <iostream>
#include <cassert>namespace tars
{TC_ThreadRWLocker::TC_ThreadRWLocker()
{int ret = ::pthread_rwlock_init(&m_sect, NULL);assert(ret == 0);if(ret != 0){throw TC_ThreadRW_Exception("[TC_ThreadRWLocker::TC_ThreadRWLocker] pthread_rwlock_init error", ret);}
}TC_ThreadRWLocker::~TC_ThreadRWLocker()
{int ret = ::pthread_rwlock_destroy(&m_sect);if(ret != 0){cerr<<"[TC_ThreadRWLocker::~TC_ThreadRWLocker] pthread_rwlock_destroy error:"<<string(strerror(ret))<<endl;;}}void TC_ThreadRWLocker::ReadLock() const
{int ret = ::pthread_rwlock_rdlock(&m_sect);if(ret != 0){if(ret == EDEADLK){throw TC_ThreadRW_Exception("[TC_ThreadRWLocker::ReadLock] pthread_rwlock_rdlock dead lock error", ret);}else{throw TC_ThreadRW_Exception("[TC_ThreadRWLocker::ReadLock] pthread_rwlock_rdlock error", ret);}}
}void TC_ThreadRWLocker::WriteLock() const
{int ret = ::pthread_rwlock_wrlock(&m_sect);if(ret != 0){if(ret == EDEADLK){throw TC_ThreadRW_Exception("[TC_ThreadRWLocker::WriteLock] pthread_rwlock_wrlock dead lock error", ret);}else{throw TC_ThreadRW_Exception("[TC_ThreadRWLocker::WriteLock] pthread_rwlock_wrlock error", ret);}}}void TC_ThreadRWLocker::TryReadLock() const
{int ret = ::pthread_rwlock_tryrdlock(&m_sect);if(ret != 0){if(ret == EDEADLK){throw TC_ThreadRW_Exception("[TC_ThreadRWLocker::TryReadLock] pthread_rwlock_tryrdlock dead lock error", ret);}else{throw TC_ThreadRW_Exception("[TC_ThreadRWLocker::TryReadLock] pthread_rwlock_tryrdlock error", ret);}}}void TC_ThreadRWLocker::TryWriteLock() const
{int ret = ::pthread_rwlock_trywrlock(&m_sect);if(ret != 0){if(ret == EDEADLK){throw TC_ThreadRW_Exception("[TC_ThreadRWLocker::TryWriteLock] pthread_rwlock_trywrlock dead lock error", ret);}else{throw TC_ThreadRW_Exception("[TC_ThreadRWLocker::TryWriteLock] pthread_rwlock_trywrlock error", ret);}}}void TC_ThreadRWLocker::Unlock() const
{int ret = ::pthread_rwlock_unlock(&m_sect);if(ret != 0){throw TC_ThreadRW_Exception("[TC_ThreadRWLocker::Unlock] pthread_rwlock_unlock error", ret);}}}

          可以看到， 是简单的封装， 别无其他。

 

 

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