Question

我想让它在子线程执行之前执行父进程。我不确定我的错误在哪里得到我的程序正在输出的订单。

int status = 0;

void *print_child(void *arg)
{

    while (status == 0)
    {
        printf("Signal hasn't changed..\n");
        sleep(1);

    }
    printf("The child has started...\n");
    printf("The child is done! \n ");
}

int main()
{
    pthread_t child;
    pthread_create(&child, NULL, &print_child, NULL);

    sleep(2);
    printf("The parent has started...\n");
    printf("The parent is done! \n");

    status++;

    if (pthread_join(child, NULL))
    {
        printf("ERROR");
        exit(1);
    }
}

输出：

signal has changed
signal has changed
parent has started
parent is done
child has started
child is done

Answer 1

排除并发执行的最简单方法是锁定。拥有＆＃34;父母＆＃34; （原始主题）在致电pthread_create之前先取消锁定，只有当它准备好了孩子时才会解锁。（新线程）要运行。＆＃34;孩子＆＃34;在做任何事之前应该拿锁;然后它可以在需要时立即解锁，或者让它控制对共享状态的访问。

如何执行父befor子线程 - c中的pthreads

1 个答案: