线程清除

最新推荐文章于 2024-04-17 23:24:27 发布

最新推荐文章于 2024-04-17 23:24:27 发布 · 168 阅读

文章标签：

#thread

本文展示了一个使用 POSIX 线程 (pthreads) 的 C 语言程序实例，该程序演示了如何通过 pthread_cleanup_push 和 pthread_cleanup_pop 函数来设置和触发线程退出时的清理操作。两个线程在运行过程中会根据条件触发不同的清理路径。

#include <stdio.h>
#include <pthread.h>
#include <unistd.h>
void *clean(void *arg)
{
printf("cleanup :%s \n",(char *)arg);
return (void *)0;
}
void *thr_fn1(void *arg)
{
printf("thread 1 start \n");
pthread_cleanup_push( (void*)clean,"thread 1 first handler");
pthread_cleanup_push( (void*)clean,"thread 1 second hadler");
printf("thread 1 push complete \n");
if(arg)
{
return((void *)1);
}
pthread_cleanup_pop(0);
pthread_cleanup_pop(0);
return (void *)1;
}

void *thr_fn2(void *arg)
{
printf("thread 2 start \n");
pthread_cleanup_push( (void*)clean,"thread 2 first handler");
pthread_cleanup_push( (void*)clean,"thread 2 second handler");
printf("thread 2 push complete \n");
if(arg)
{
pthread_exit((void *)2);
}
pthread_cleanup_pop(0);
pthread_cleanup_pop(0);
pthread_exit((void *)2);
}

int main(void)
{
int err;
pthread_t tid1,tid2;
void *tret;

err=pthread_create(&tid1,NULL,thr_fn1,(void *)1);
if(err!=0)
{
printf("error .... \n");
return -1;
}
err=pthread_create(&tid2,NULL,thr_fn2,(void *)1);

if(err!=0)
{
printf("error .... \n");
return -1;
}
err=pthread_join(tid1,&tret);
if(err!=0)
{
printf("error .... \n");
return -1;
}
printf("thread 1 exit code %d \n",(int)tret);

err=pthread_join(tid2,&tret);
if(err!=0)
{
printf("error .... ");
return -1;
}

printf("thread 2 exit code %d \n",(int)tret);

return 1;
}