pthread_join函数的应用

#include
#include
#include
#include
#include

void *thread_func(void *arg)
{
    sleep(2);
    printf("thread...........\n");
    pthread_exit("thread end...");
}

int main(int argc, char *argv[])
{  
    pthread_t thread;   
    int err;
    err = pthread_create(&thread, NULL, thread_func, NULL);
    if (err != 0)
    {
        fprintf(stderr, "pthread_create: %s\n", strerror(err));
        return -1;
    }
    void *retval = NULL;
    //pthread_join(thread, NULL);
    pthread_join(thread, &retval);  //等待线程退出，并给线程回收资源
    printf("join: %s\n", (char *)retval);

    return 0;
}