我怎样才能知道是否可靠提振线程已退出其运行的方法？ [英] How can I tell reliably if a boost thread has exited its run method?

问题描述

我以为可连接将表明这一点，但是，它似乎并不如此。

I assumed joinable would indicate this, however, it does not seem to be the case.

在工人类，我试图表明，它仍然在通过predicate处理：

In a worker class, I was trying to indicate that it was still processing through a predicate:

bool isRunning(){return thread_->joinable();}

那不是没有退出线程是可连接？我在想什么？是什么推动线程的含义::可连接？

Wouldn't a thread that has exited not be joinable? What am I missing... what is the meaning of boost thread::joinable?

推荐答案

既然你可以加入一个线程已终止后，甚至，可连接（），直到你调用连接（）或分离（仍然会返回true）。如果你想知道如果一个线程仍在运行，你应该能够调用timed_join与0。注意等待时间，这可能会导致竞争状态，因为线程可以终止呼叫之后。

Since you can join a thread even after it has terminated, joinable() will still return true until you call join() or detach(). If you want to know if a thread is still running, you should be able to call timed_join with a wait time of 0. Note that this can result in a race condition since the thread may terminate right after the call.

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