Question

When i using

int event_idx = WaitHandle.WaitAny(ExportEvents.ToArray());

and if event is in signaled state before WaitAny function calls then WaitAny function will:

1. result this event id immediately
2. skip this event and never result this id

?

Answer 1

From the documentation:

This method returns when any handle is signaled.

Notice is says it returns when a handle is signaled, not when it becomes signaled. That means if some handle is already signaled, the method returns immediately.

Of course, it’s possible that a handle is in signaled state before the call, but it’s not signaled during the call, due to a race condition.