hev (HEV) - input

The handle of the event semaphore to wait for.

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:

• SEM_IMMEDIATE_RETURN DosWaitEventSem returns without blocking the calling thread.

• SEM_INDEFINITE_WAIT
  DosWaitEventSem blocks the calling thread indefinitely.

ulrc (APIRET) - returns

Return Code.

DosWaitEventSem returns one of the following values:

• NO_ERROR 6
  ERROR_INVALID_HANDLE
  8
  ERROR_NOT_ENOUGH_MEMORY
  95
  ERROR_INTERRUPT
  640
  ERROR_TIMEOUT
  For a full list of error codes, see Errors.