hmtx (HMTX) - input

The handle of the mutex semaphore to request.

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.

ulrc (APIRET) - returns

Return Code.

DosRequestMutexSem returns one of the following values:

• NO_ERROR 6
  ERROR_INVALID_HANDLE
  95
  ERROR_INTERRUPT
  103
  ERROR_TOO_MANY_SEM_REQUESTS
  105
  ERROR_SEM_OWNER_DIED
  640
  ERROR_TIMEOUT
  For a full list of error codes, see Errors.

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