Linux C++ 使用condition实现阻塞队列的方法

linux  /  管理员 发布于 7年前   184

实例如下：

/* * BlockingQueue.h * * Created on: 2014年6月10日 *   Author:  */#ifndef BLOCKINGQUEUE_H_#define BLOCKINGQUEUE_H_#include <iostream>#include <pthread.h>using namespace std;//template <typename T >class BlockingQueue{public:BlockingQueue();BlockingQueue(int capacity);~BlockingQueue();bool push(int item);int poll();private:int capacity;int* queue;int head,tail;pthread_mutex_t mutex;pthread_cond_t notFull,notEmpty;};#endif /* BLOCKINGQUEUE_H_ */

/* * BlockingQueue.cpp * *  Created on: 2014年6月10日 *      Author:  */#include "../include/BlockingQueue.h"BlockingQueue::BlockingQueue(){    this->capacity = 10;    queue = new int[capacity];    head = 0,tail = 0;    pthread_mutex_init(&mutex,NULL);    pthread_cond_init(¬Full,NULL);    pthread_cond_init(¬Empty,NULL);}BlockingQueue::BlockingQueue(int capacity){    this->capacity = capacity;    queue = new int[capacity];    cout << "capacity " << sizeof(queue) << endl;    head = 0,tail = 0;    pthread_mutex_init(&mutex,NULL);    pthread_cond_init(¬Full,NULL);    pthread_cond_init(¬Empty,NULL);}BlockingQueue::~BlockingQueue(){    this->capacity = 0;    head = 0,tail = 0;    delete queue;    pthread_mutex_destroy(&mutex);    pthread_cond_destroy(¬Full);    pthread_cond_destroy(¬Empty);}bool BlockingQueue::push(int item){    pthread_mutex_lock(&mutex);    cout << "you want push " << item << endl;    while((head + 1) % capacity == tail)//is full    {        cout << "is full,wait..." << endl;        // push wait        pthread_cond_wait(¬Full,&mutex);        cout << "not full,unlock" << endl;    }    {        queue[head] = item;        head = (head + 1) % capacity;        cout << "push " << item << endl;        //wake up poll thread        pthread_cond_signal(¬Empty);        pthread_mutex_unlock(&mutex);        return true;    }}int BlockingQueue::poll(){    pthread_mutex_lock(&mutex);    int ret = 0;    while(head == tail) // is empty    {        cout << "is empty,wait..." << endl;        //poll wait        pthread_cond_wait(¬Empty,&mutex);        cout << "not empty,unlock..." << endl;    }    {        ret = queue[tail];        tail = (tail + 1) % capacity;        cout << "take " << ret << endl;        //wake up push thread        pthread_cond_signal(¬Full);        pthread_mutex_unlock(&mutex);        return ret;    }}

#include <iostream>#include "include/BlockingQueue.h"using namespace std;BlockingQueue queue(3);void* put(void *){queue.push(1);  queue.push(2);  queue.push(3);  queue.push(4);  queue.push(5);  return NULL;}void* take(void *){queue.poll();queue.poll();queue.poll();return NULL;}int main() {pthread_t put1,take1;  pthread_create(&put1,NULL,put,0);  pthread_create(&take1,NULL,take,0);  void * retval;  pthread_join(put1,&retval);  pthread_join(take1,&retval);return 0;}

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