是“原子”中断检查可能在java？ [英] Is an "atomic" interrupt check possible in java?

问题描述

如果在Java中使用以下idiom中断，例如从此答案。

  while（！Thread.currentThread（）。isInterrupted（））{
 try {
 = queue.take（）; 
 handle（value）; 
} catch（InterruptedException e）{
 Thread.currentThread（）。interrupt（）; 
} 
} 
  

其中 take 是一个阻塞操作，可以暂时忽略中断如果在 Thread.currentThread（）。isInterrupted（）和调用 queue.take（）？这不是检查比行动操作吗？

有可能使用超时时间因此

解决方案 / div>

我会交换try / catch和while循环：

  try {
 while ）{
 Object value = queue.take（）; 
 handle（value）; 
} 
} catch（InterruptedException e）{
 Thread.currentThread（）。interrupt（）; 
} 
  

take（）操作将立即抛出 InterruptedException ，并且同时突破while循环。

If using following "idiom" with interruption in Java, for example from this answer.

while (!Thread.currentThread().isInterrupted()) {
    try {
        Object value = queue.take();
        handle(value);
    } catch (InterruptedException e) {
        Thread.currentThread().interrupt();
    }
}

Where take is a blocking operation, can an interrupt not be ignored for the time being if an interrupt "arrives" between the check of Thread.currentThread().isInterrupted() and the call queue.take()? Is this not a "check-than-act" operation? If so, can it somehow be guaranteed that the loop is left in any case if the thread is interrupted?

It is possible to use poll with a timeout so that the loop is left after the timeout, but is it possible to check the interrupted status and act on it atomically?

解决方案

I would swap the try/catch and while loop:

try {
  while (true) {
    Object value = queue.take();
    handle(value);
  }
} catch (InterruptedException e) {
  Thread.currentThread().interrupt();
}

The take() operation will throw an InterruptedException immediately if the thread is interrupted, and at the same time break out of the while loop.

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