WaitForMultipleObjects and several SetEvent()'s

I process some event, signaled by WFMO, and at this time it's sign开发者_如何学JAVAaled more N times. Would WFMO return once or N times?

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Once. An event is basically like a Boolean variable; SetEvent is pretty much the same as event = true; -- setting it to true if it's already true has no effect.

If you want something that keeps count, consider using a semaphore instead of an event.