条件变量

来源：互联网发布：java getruntime exec 编辑：程序博客网时间：2024/05/08 11:39
#include <pthread.h>#include <stdio.h>#include <stdlib.h>pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;/*初始化互斥锁*/pthread_cond_t cond = PTHREAD_COND_INITIALIZER;/*初始化条件变量*/void *thread1(void *);void *thread2(void *);int i=1;int main(void){    pthread_t t_a;    pthread_t t_b;    pthread_create(&t_a,NULL,thread2,(void *)NULL);/*创建进程t_a*/    pthread_create(&t_b,NULL,thread1,(void *)NULL); /*创建进程t_b*/    pthread_join(t_b, NULL);/*等待进程t_b结束*/    pthread_mutex_destroy(&mutex);    pthread_cond_destroy(&cond);    exit(0);}void *thread1(void *junk){    for(i=1;i<=9;i++)     {        pthread_mutex_lock(&mutex);/*锁住互斥量*/        if(i%3==0)             pthread_cond_signal(&cond);/*条件改变，发送信号，通知t_b进程*/        else                     printf("thead1:%d\n",i);        pthread_mutex_unlock(&mutex);/*解锁互斥量*/<span style="white-space:pre"></span>sleep(1);    }}void *thread2(void *junk){    while(i<9)    {        pthread_mutex_lock(&mutex);<span style="white-space:pre"></span>if(i%3!=0)            pthread_cond_wait(&cond,&mutex);/*等待*/        printf("thread2:%d\n",i);        pthread_mutex_unlock(&mutex);<span style="white-space:pre"></span>sleep(1);    }}
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