Linux线程终止

Linux线程终止

进程中的任一线程调用了exit，_Exit或者_exit，那么整个进程都会终止。      单个线程在不终止整个进程的情况下停止它的控制流，有三种方式：（1）线程只是从启动例程中返回，返回值是线程的退出码。（2）线程可以被同一进程中的其他线程取消。（3）线程调用pthread_exit。1、单个线程调用exit，_Exit或者_exitvoid* task1(void* arg){ while (1) {sleep(1);printf("thread1 running...\n");} return NULL;}void* task2(void *arg){　　while (1) {sleep(1);printf("thread2 running...\n");}　　return NULL;}void* task3(void *arg){ int i = 0; while (i++ < 5) {sleep(1);printf("thread3 running...\n");} exit(1); //_Exit(1); //_exit(1); return NULL;}int main(int argc, char *argv[]){ pthread_t thrd1, thrd2, thrd3; pthread_create(&thrd1, NULL, (void*)task1, NULL); pthread_create(&thrd2, NULL, (void*)task2, NULL); pthread_create(&thrd3, NULL, (void*)task3, NULL); pthread_join(thrd1, NULL); pthread_join(thrd2, NULL); pthread_join(thrd3, NULL); printf("Main thread exit...\n"); return 0;}程序输出：[root@robot ~]# vim thread_exit.c[root@robot ~]# gcc thread_exit.c -lpthread -o thread_exit[root@robot ~]# ./thread_exitthread2 running...thread3 running...thread1 running...thread2 running...thread3 running...thread1 running...thread2 running...thread3 running...thread1 running...thread2 running...thread3 running...thread1 running...thread2 running...thread3 running...[root@robot ~]#这里可以看到调用exit、_Exit、_exit会使整个进程退出。2、单个线程调用pthread_exitvoid pthread_exit(void* rval_ptr);rval_ptr是一个无类型指针，可以通过调用pthread_join函数访问到这个指针。void* task1(void* arg){ int i = 0; while (i++ < 5) { sleep(1); printf("thread1 running...\n"); } pthread_exit((void*)23); return NULL;}int main(int argc, char *argv[]){ pthread_t thrd1, thrd2, thrd3; void* tret; pthread_create(&thrd1, NULL, (void*)task1, NULL); pthread_join(thrd1, &tret); printf("thread1 return code:%d\n", (int)tret); printf("Main thread exit...\n"); return 0;}程序输出：[root@robot ~]# gcc thread_exit.c -lpthread -o thread_exit[root@robot ~]# ./thread_exitthread1 running...thread1 running...thread1 running...thread1 running...thread1 running...thread1 return code:23Main thread exit...[root@robot ~]#

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