? ? ? ? ?BlockingQueue是muduo是無界隊列，利用隊列(deque)實現，向隊列中加入和取出元素用互斥量和條件變量結合的方式來操作，就是一個線程同步的問題。

BlockingQueue.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_BLOCKINGQUEUE_H #define MUDUO_BASE_BLOCKINGQUEUE_H#include "muduo/base/Condition.h" #include "muduo/base/Mutex.h"#include <deque> #include <assert.h>namespace muduo { //互斥鎖配合條件變量是為了防止線程不停的主動獲得鎖、檢查條件、釋放鎖、再獲得鎖、再檢查、再釋放，一直到滿足運行的條件的時候才行 template<typename T> class BlockingQueue : noncopyable //無界阻塞隊列 {public:BlockingQueue(): mutex_(),notEmpty_(mutex_), //條件變量queue_(){}void put(const T& x){MutexLockGuard lock(mutex_);queue_.push_back(x);notEmpty_.notify(); // wait morphing saves us// http://www.domaigne.com/blog/computing/condvars-signal-with-mutex-locked-or-not/}void put(T&& x){MutexLockGuard lock(mutex_);queue_.push_back(std::move(x));notEmpty_.notify();//向所有線程提示條件已發生}T take(){MutexLockGuard lock(mutex_);// always use a while-loop, due to spurious wakeupwhile (queue_.empty()){notEmpty_.wait(); //等待條件發生}assert(!queue_.empty());T front(std::move(queue_.front()));//掏空queue_.front()，queue_.front()就變為空了queue_.pop_front();return std::move(front);}size_t size() const{MutexLockGuard lock(mutex_);return queue_.size();}private:mutable MutexLock mutex_;Condition notEmpty_ GUARDED_BY(mutex_);std::deque<T> queue_ GUARDED_BY(mutex_); };} // namespace muduo#endif // MUDUO_BASE_BLOCKINGQUEUE_H

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