ulTimeout (ULONG) - input

Time-out in milliseconds.

This is the maximum amount of time the user wants to allow the thread to be blocked.

This parameter can also have the following values:

SEM_IMMEDIATE_RETURN (0)

WinWaitMuxWaitSem returns without blocking the calling thread.
SEM_INDEFINITE_WAIT (-1)
WinWaitMuxWaitSem blocks the calling thread indefinitely.

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