UNIX环境高级编程：主线程与子线程的退出关系

示例代码：

#include <stdio.h>  
#include <stdlib.h>  
#include <pthread.h>  
#include <unistd.h>  
#include <sys/types.h>  
      
pthread_t ntid;//线程ID  
      
void printids(const char *s)  
{  
        pid_t pid;  
        pthread_t tid;  
        pid = getpid();  
        tid = pthread_self();  
        printf("%s pid %u tid %u (0x%x)n",s,(unsigned int)pid,  
                       (unsigned int)tid,(unsigned int)tid);  
}  
      
      
void *thrfun2(void *arg){  
        sleep(1);//使得创建它的主线程先退出  
        printids("new thread of the new thread");  
      
        return ((void *)0);  
}  
      
void *thrfun(void *arg){  
        sleep(1);//使得主线程先退出  
        printids("new thread");  
        int err;  
        err = pthread_create(&ntid,NULL,thrfun2,NULL);  
      
        if(err != 0)  
                perror("pthread_create");  
      
        return ((void *)0);  
}  
      
int main(){  
        int err;  
        err = pthread_create(&ntid,NULL,thrfun,NULL);  
      
        if(err != 0)  
                perror("pthread_create");  
        printids("main thread");  
      
        //sleep(1);  
      
        pthread_exit(NULL);  
}

运行结果：

huangcheng@ubuntu:~$ ./a.out
main thread pid 2413 tid 3077912256 (0xb77536c0)  
new thread pid 2413 tid 3077909360 (0xb7752b70)  
new thread of the new thread pid 2413 tid 3069516656 (0xb6f51b70)

作者信息：csdn博客 ctthuangcheng

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