线程保护设计及清除
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#include <stdio.h>#include <pthread.h>#include <unistd.h>/*线程清理函数*/void *clean(void *arg){ printf("clean up:%s \n",(char *)arg); return (void*)0;} /*线程1的执行程序*/void *thr_fn1(void *arg){ printf("thread1 start..\n"); /*将线程清理函数压入清除栈两次*/ pthread_cleanup_push((void*)clean,"thread 1 first handler \n"); pthread_cleanup_push((void*)clean,"thread 1 second handler \n"); printf("thread 1 push complete \n"); if(arg) { return (void *)1;//线程运行到这里会结束,后面的代码不会被运行。由于是用return退出,所以不会执行线程清理函数。 1被tret返回; } pthread_cleanup_pop(0);//正常情况非0执行,0不执行,在此程序中没用。 pthread_cleanup_pop(0); return (void *)1;} /*线程2的执行程序*/void *thr_fn2(void *arg) { printf("thread 2 start..\n"); /*将线程清理函数压入清除栈两次*/ pthread_cleanup_push((void*)clean,"thread 2 first handler\n"); pthread_cleanup_push((void*)clean,"thread 2 second handler \n"); printf("thread 2 push complete \n"); if(arg) { pthread_exit((void*)2);///* 线程运行到这里会结束,后面的代码将不会被运行。由于是pthread_exit退出,所以会执行线程清理函数, 执行的顺序是先压入的后执行,后压入的先执行。2被tret返回*/ } pthread_cleanup_pop(0); printf("break point");//不会执行 pthread_cleanup_pop(0); pthread_exit((void *)2); }int main(void){ int err; pthread_t tid1,tid2; void *tret ; /*创建线程1并执行线程执行函数*/ err=pthread_create(&tid1,NULL,thr_fn1,(void *)1); if(err!=0) { printf("error.....\n"); return -1; } /*创建线程2并执行线程执行函数*/ err=pthread_create(&tid2,NULL,thr_fn2,(void*)1); if(err!=0) { printf("error ...\n"); return -1; } /*阻塞,等待线程1退出,并获得线程1的返回值*/ err=pthread_join(tid1,&tret); if(err!=0) { printf("erro ...\n"); return -1; } printf("thread 1 exit code %d \n",(int)tret); /*阻塞,等待线程2退出,并获得线程2的返回值*/ err=pthread_join(tid2,&tret); if(err!=0) { printf("erro ...\n"); return -1; } printf("thread 2 exit code %d \n",(int)tret); return 1;}/*void*(*start_rtn)(void) //pthread_create要想传多个参数,可以定义一个结构体,把要传的参数包起来,传结构体的地址就ok,参数为(void *)void(*rtn)(void *) //pthread_cleanup_push如果进程中的任何一个线程中调用exit或_exit,那么整个进程都会终止。*//*运行结果:qust@qust-K42JZ:~/test$ ./thread_clean thread 2 start..thread 2 push complete thread1 start..thread 1 push complete thread 1 exit code 1 clean up:thread 2 second handler clean up:thread 2 first handler thread 2 exit code 2 线程2在遇到 pthread_cleanup_pop(0);才会执行除函数*/