多线程编程实例

代码：

#include<stdio.h>
#include<pthread.h>
static int run=-1;
static int retvalue;
void *start_routine(void *arg)
{int *running =arg;printf("child Thread initial over,pass in parameters:%d\n",*running);while(*running){printf("child thread is running\n");usleep(1);}printf("child thread quit\n");retvalue=8;pthread_exit((void*)&retvalue);
}
int main(void)
{pthread_t pt;int ret=-1;int times=3;int i=0;int *ret_join=NULL;ret=pthread_create(&pt,NULL,(void*)start_routine,&run);if(ret!=0){printf("create thread failed!\n");return 1;		}usleep(1);for(;i<times;i++){printf("main thread print\n");usleep(1);}		run=0;pthread_join(pt,(void*)&ret_join);printf("thread back value is:%d\n",*ret_join);return 0;
}

运行

第一次：

第二次

前后两次结果不一致，主要是两个线程争夺CPU资源造成的