Moving out of a Blocked State

• A thread must move out of a blocked state into the runnable state using the opposite of whatever put it into the blocked state:

  • If a thread has been put to sleep(), the specified timeout period must expire.
  • If a thread has been suspended, someone must call its resume() method.
  • If a thread called wait(), then someone else using the resource for which it is waiting must call notify() or notifyAll().
  • If a thread is waiting for the completion of an input or output operation, then the operation must finish.

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