DosRequestMutexSem Parameter - ulTimeout

ulTimeout (ULONG) - input

The 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:

0L

SEM_IMMEDIATE_RETURN
DosRequestMutexSem returns immediately without blocking the calling thread.
-1L
SEM_INDEFINITE_WAIT
DosRequestMutexSem blocks the calling thread indefinitely.

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