线程函数pthread_join

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#include <stdio.h>#include <stdlib.h>#include <pthread.h>void *thrd_func1(void *arg);void *thrd_func2(void *arg);int main(){    pthread_t tid1,tid2;    void *tret;     if (pthread_create(&tid1,NULL,thrd_func1,NULL)!=0) {        printf("Create thread 1 error!\n");        exit(1);    }    if (pthread_create(&tid2,NULL,thrd_func2,NULL)!=0) {        printf("Create thread 2 error!\n");        exit(1);    }       if (pthread_join(tid1,&tret)!=0){        printf("Join thread 1 error!\n");        exit(1);    }    printf("Thread 1 exit code: %d.\n",(int *)tret);    if (pthread_join(tid2,&tret)!=0){        printf("Join thread 2 error!\n");        exit(1);    }    printf("Thread 2 exit code: %d.\n",(int *)tret);    return 0;}void *thrd_func1(void *arg){    printf("Thread 1 returning!\n");    sleep(3);    return ((void *)1); // 自动退出线程}void *thrd_func2(void *arg){    printf("Thread 2 returning!\n");    sleep(8);    pthread_exit((void *)2);  // 线程主动退出，}