From Warp3 fix pack 29 and Warp 4 fix pack 5 the following addition function
is available to DosCreateEventSem.

The semaphore attribute may specify the following additional flags:

DCE_AUTORESET 0x1000

   This will cause the semaphore to be reset automatically at the time it is posted.

DCE_POSTONE 0x0800

   This will cause only one thread to be posted where multiple threads are waiting on an
   event semaphore created with this attribute. DCE_POSTONE also causes the semaphore to
   be reset automatically when it is posted.


