Check interrupted status from within wait()

Question

When a thread t calls the wait() method on an object u, it goes to the WAITING state until another thread calls notify() on the same object u OR another thread calls the interrupt() method on the waiting thread t. Taking into account that a waiting thread does not consume CPU cycles, how is it possible for the waiting thread to check the interrupted status within wait() and throw an InterruptedException?

That is, I imagine the following code within wait():

if (Thread.interrupted())  // Clears interrupted status!
  throw new InterruptedException();

score 4 · Accepted Answer · answered Sep 03 '16 at 06:58

A thread in the status WAITING must be resumed to become RUNNABLE again.

This resumption is being done at a lower level and is invoked by both, a notification or an interrupt.

A waiting thread does not execute any code. Instead the interrupt flag is set (at a lower level), the thread is resumed - state RUNNABLE - and once it is RUNNING again, the interrupt status is checked.

Check interrupted status from within wait()

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