Linux C++ 使用condition实现阻塞队列的方法
实例如下：
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/* * 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_ */ |
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/* * 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;
}
} |
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#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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