muduo之CountDownLatch.cc

CountDownLatch用线程同步的。

CountDownLatch.h

// Use of this source code is governed by a BSD-style license
// that can be found in the License file.
//
// Author: Shuo Chen (chenshuo at chenshuo dot com)#ifndef MUDUO_BASE_COUNTDOWNLATCH_H
#define MUDUO_BASE_COUNTDOWNLATCH_H#include "muduo/base/Condition.h"
#include "muduo/base/Mutex.h"namespace muduo
{
//对 Condition(条件变量)的封装,通过倒计时计数器的方式，设置计数
class CountDownLatch : noncopyable
{public:explicit CountDownLatch(int count);             //count是线程的数量void wait();void countDown();int getCount() const;private:                     //CountDownLatch由一把锁，条件变量，计数器构成mutable MutexLock mutex_;Condition condition_ GUARDED_BY(mutex_);int count_ GUARDED_BY(mutex_);//count是线程的数量
};}  // namespace muduo
#endif  // MUDUO_BASE_COUNTDOWNLATCH_H

CountDownLatch.cc

// Use of this source code is governed by a BSD-style license
// that can be found in the License file.
//
// Author: Shuo Chen (chenshuo at chenshuo dot com)#include "muduo/base/CountDownLatch.h"using namespace muduo;CountDownLatch::CountDownLatch(int count)//倒计时计数器: mutex_(),condition_(mutex_),                //初始化，条件变量用成员锁初始化count_(count)
{
}void CountDownLatch::wait()
{MutexLockGuard lock(mutex_);while (count_ > 0)          //只要计数值大于0，CountDownLatch类就不工作，知道等待计数值为0{condition_.wait();}
}void CountDownLatch::countDown()           //倒数，倒计时
{MutexLockGuard lock(mutex_);--count_;if (count_ == 0){condition_.notifyAll();}
}int CountDownLatch::getCount() const           //获得次数
{MutexLockGuard lock(mutex_);return count_;
}

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