Linux C++ 使用condition实现阻塞队列的方法

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(&notfull,null);
    pthread_cond_init(&notempty,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(&notfull,null);
    pthread_cond_init(&notempty,null);

}

blockingqueue::~blockingqueue()
{
    this->capacity = 0;
    head = 0,tail = 0;
    delete queue;
    pthread_mutex_destroy(&mutex);
    pthread_cond_destroy(&notfull);
    pthread_cond_destroy(&notempty);
}

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(&notfull,&mutex);
        cout << "not full,unlock" << endl;
    }

    {
        queue[head] = item;
        head = (head + 1) % capacity;
        cout << "push " << item << endl;
        //wake up poll thread
        pthread_cond_signal(&notempty);
        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(&notempty,&mutex);
        cout << "not empty,unlock..." << endl;
    }
    {
        ret = queue[tail];
        tail = (tail + 1) % capacity;
        cout << "take " << ret << endl;
        //wake up push thread
        pthread_cond_signal(&notfull);

        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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