ForkJoinPool重置线程中断状态(ForkJoinPool resets thread interrupted state)

 当我取消ForkJoinPool返回的Future时，我注意到以下现象。 给出以下示例代码： 
 
ForkJoinPool pool = new ForkJoinPool();
Future<?> fut = pool.submit(new Callable<Void>() {

  @Override
  public Void call() throws Exception {
    while (true) {
      if (Thread.currentThread().isInterrupted()) { // <-- never true
        System.out.println("interrupted");
        throw new InterruptedException();
      }
    }
  }
});

Thread.sleep(1000);
System.out.println("cancel");
fut.cancel(true);
 
 该程序永远不会打印interrupted 。 ForkJoinTask＃cancel（boolean）的文档说： 
 
 
 
 mayInterruptIfRunning - 此值在默认实现中无效，因为中断不用于控制取消。 
 
 
 如果ForkJoinTasks忽略了中断，你应该如何在提交给ForkJoinPool的Callables中检查取消？ 

I just noticed the following phenomena when cancelling a Future returned by ForkJoinPool. Given the following example code:
 
ForkJoinPool pool = new ForkJoinPool();
Future<?> fut = pool.submit(new Callable<Void>() {

  @Override
  public Void call() throws Exception {
    while (true) {
      if (Thread.currentThread().isInterrupted()) { // <-- never true
        System.out.println("interrupted");
        throw new InterruptedException();
      }
    }
  }
});

Thread.sleep(1000);
System.out.println("cancel");
fut.cancel(true);
 
The program never prints interrupted. The docs of ForkJoinTask#cancel(boolean) say:
 
 
 
mayInterruptIfRunning - this value has no effect in the default implementation because interrupts are not used to control cancellation.
 
 
If ForkJoinTasks ignore interrupts, how else are you supposed to check for cancellation inside Callables submitted to a ForkJoinPool? 

原文：https://stackoverflow.com/questions/21320156