检查 std::thread 是否仍在运行 [英] Check if std::thread is still running

问题描述

有没有办法确定线程是否仍在运行?由于多种原因，我无法使用 std::future 和 std::async.

Is there a way to determine if a thread is still running? I cannot use std::future and std::async for several reasons.

我想到了某种带有超时的join，例如尝试加入一个线程3秒，如果成功则认为该线程已完成，否则认为该线程正在运行.

I thought of some kind of join with timeout, e.g. try to join a thread for 3 seconds, if it succeeds, the thread is considered finished, otherwise it is considered running.

推荐答案

最接近的是 std::thread::joinable().从参考中引用:

The closest you can get is std::thread::joinable(). To cite from the reference:

检查线程对象是否标识了一个活动的执行线程.具体来说，如果 get_id() != std::thread::id()，则返回 true.所以默认构造的 thread 是不可连接的.
已完成代码执行但尚未加入的线程仍被视为活动的执行线程，因此是可加入的.

Checks if the thread object identifies an active thread of execution. Specifically, returns true if get_id() != std::thread::id(). So a default constructed thread is not joinable.
A thread that has finished executing code, but has not yet been joined is still considered an active thread of execution and is therefore joinable.

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