如何实现pthread_join? [英] How is pthread_join implemented?

问题描述

我对线程技术还是有点陌生​​，所以您必须原谅这个问题的天真.

I'm a little new to threading, so you'll have to forgive the naiveté of this question.

pthread_join的实现方式如何影响线程调度?

How is pthread_join implemented and how does it effect thread scheduling?

我总是想像pthread_join是用while循环实现的，只是使调用线程屈服直到目标线程完成.像这样(非常近似的伪代码):

I always pictured pthread_join implemented with a while loop, simply causing the calling thread to yield until the target thread completes. Like this (very approximate pseudocode):

atomic bool done;

thread_run {

    do_stuff();
    done = true;

}

thread_join {

    while(!done) {
        thread_yield();
    //  basically, make the thread that calls "join" on
    //  our thread yield until our thread completes
    }
}

这是一个准确的描述，还是我大大简化了流程?

Is this an accurate depiction, or am I vastly oversimplifying the process?

干杯！

推荐答案

是的.有关特定实现的详细信息，请参见

Yes that's the general idea. For gory details of a particular implementation take a look at glibc.

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