线程创建（独立）永远不会执行 [英] Thread created (detached) never executed

问题描述

我写了这个code：

void* th (void* arg)
{
    sleep(1);
    for(int i=0; i<1000;i++)
    {
    fprintf(stderr,"%d\t",i);
    }
    pthread_exit(NULL);
}

int main(int argc, char** argv)
{
    pthread_t thread;
    pthread_attr_t attr;
    pthread_attr_init(&attr);
    pthread_attr_setdetachstate(&attr,PTHREAD_CREATE_DETACHED);
    pthread_create(&thread,&attr,th,NULL);
    pthread_attr_destroy(&attr);
    return 0;
}

分离状态的应使线程没有可连接，所以它应该运行甚至在主要流程是terminated.But未打印的数字，我看到的是该线程终止而没有任何打印到标准错误。

为什么不分离的线程中执行？

The detach state should make the thread not joinable, so it should run even after the main process is terminated.But it doesn't print the numbers, all I see is that the thread terminated without printing anything to stderr.
Why isn't the detached thread executed?

推荐答案

A 收益从主线程相当于整个过程的退出，所以你的过程将退出之前，你的线程甚至会打印出任何东西。使用了pthread_exit ，而不是终止该线程。

A return from the main thread is equivalent to an exit of the whole process, so your process will exit before your thread may even print anything. Use pthread_exit instead to terminate that thread.

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