三个同步与互斥问题之生产者与消费者

#include<stdio.h>
#include<pthread.h>
pthread_mutex_t  mutex;
#define Max 10


pthread_cond_t pro;
pthread_cond_t con;


int buffer=0;//全局变量----一开始为0，只有生产者可以执行


void deal_produce(void *arg)
{//消费---
int i;
for(i=1;i<=Max;i++)
{//
pthread_mutex_lock(&mutex);
while(buffer!=0)  pthread_cond_wait(&pro,&mutex);//锁住生产者,在有产品的时候
printf("producer produce item :%d\n",i);
buffer=i;
pthread_cond_signal(&con);//通知消费者
pthread_mutex_unlock(&mutex);

}
pthread_exit(NULL);


}


void deal_consume(void *arg)
{//生产
int i;
for(i=1;i<=Max;i++)
{//加锁，消费的时候不准生产

pthread_mutex_lock(&mutex);
while(buffer==0) pthread_cond_wait(&con,&mutex);
printf("consumer consume item :%d\n",i);
buffer=0;//！？buffer--?
if(buffer==0) pthread_cond_signal(&pro);//没货待产
pthread_mutex_unlock(&mutex);
}
pthread_exit(NULL);


}
int main()
{
    pthread_t consumer,producer;


    pthread_mutex_init(&mutex,0);
//0 :NULL  
//API :int pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *mutexattr)


    pthread_cond_init(&pro,0);
    pthread_cond_init(&con,0);


   pthread_create(&producer,NULL,&deal_produce,NULL); 
   pthread_create(&consumer,NULL,&deal_consume,NULL);    
   
    pthread_join(consumer);
    pthread_join(producer);

   pthread_cond_destroy(&pro);
   pthread_cond_destroy(&con);


    exit(0);
}