如何区分等待（长时间超时）退出通知或超时？ [英] How to differentiate when wait(long timeout) exit for notify or timeout?

问题描述

有这个等待声明：

public final native void wait(long timeout) throws InterruptedException;

它可能会被InterruptedException或超时退出，或者因为另一个线程中调用了Notify / NotifyAll方法，异常很容易捕获但是......

It could exit by InterruptedException, or by timeout, or because Notify/NotifyAll method was called in another thread, Exception is easy to catch but...

有什么方法可以知道退出原因是超时还是通知？

There is any way to know if the exits cause was timeout or notify?

编辑：

这是一种可行的方法，（虽然我不喜欢）

This is a tricky way that could work, (although I don't like it)

          long tBefore=System.currentTimeMillis();
          wait(TIMEOUT);
          if ((System.currentTimeMillis() - tBefore) > TIMEOUT) 
            { 
               //timeout
            }

推荐答案

除非您提供一些额外的代码，否则无法区分这两者。例如，通过添加 ThreadLocal 布尔设置为 true 仅限于 notify（）

You can't differentiate between the two unless you provide some additional code. For example by adding a ThreadLocal Boolean that is set to true only on notify()

但首先，您必须确保您的逻辑需要区分。

But first you must make sure your logic requires this differentiation.

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