在终止的线程上调用pthread_cancel()是否安全? [英] Is it safe to call pthread_cancel() on terminated thread?

问题描述

我想知道在终止的线程上调用pthread_cancel()是否安全.我在手册页中找不到任何提示.预先感谢您的任何提示.

I'm wondering if it is safe to call pthread_cancel() on a terminated thread. I couldn't find any hints in the manual page. Thanks in advance for any hints.

也许我不够准确.我不是在不是谈论由较早的pthread_cancel()终止的线程，而是谈论只是从其线程函数返回的线程.

Maybe I wasn't accurate enough. I'm not talking about threads terminated by an earlier pthread_cancel() but about threads that simply returned from their thread function.

推荐答案

我认为需要是安全的，否则pthread_cancel会出现问题(几乎无法使用).

I think it needs to be safe, or pthread_cancel would be problematic (next to unusable).

的确，如果不安全，对pthread_cancel的每次调用都必须通过检查线程是否处于活动状态(并确保其保持活动状态直到您取消它)而变得非常复杂.一个简单的你还在那儿"是不会的.

Indeed, if it wouldn't be safe, every call to pthread_cancel would have to be enormously complicated by checking the thread is alive (and ensuring it stays alive until you get to cancel it). A simple "are you still there" wouldn't do.

最后，我认为如果线程终止，pthread_cancel 必须是安全的.当然，终止并加入线程可能不是这种情况.

In conclusion, I believe pthread_cancel must be safe if the thread has terminated. Of course, this might not be the case for a terminated and joined thread.

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