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d�d�ZdS)a�A generally useful event scheduler class.
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supposed to return the current time, one that is supposed to
implement a delay. You can implement real-time scheduling by
substituting time and sleep from built-in module time, or you can
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way the queue can be maintained as a priority queue. Execution of the
event means calling the action function, passing it the argument
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delay function is called and the event is left in the queue;
otherwise, the event is removed from the queue and executed
(its action function is called, passing it the argument). If
the delay function returns prematurely, it is simply
restarted.
It is legal for both the delay function and the action
function to modify the queue or to raise an exception;
exceptions are not caught but the scheduler's state remains
well-defined so run() may be called again.
A questionable hack is added to allow other threads to run:
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