Int 31 Fn 0D02  P - DPMI 1.0+ - Serialize Shared Memory                    [E]

   AX = 0D02h
   SI:DI = shared memory block handle
   DX = flags
       bit 0: return immediately rather than suspending if serialization
           unavailable
       bit 1: shared rather than exclusive serialization
       bits 2-15 reserved (0)

Return: CF clear if successful
   CF set on error
       AX = error code (8004h,8005h,8017h-8019h,8023h) (see AX=0000h)

Notes: an exclusive serialization blocks any other serialization attempts for
     the same block by another virtual machine; a shared serialization
     blocks attempts at exclusive serialization by another virtual machine
   hosts are not required to detect deadlock
   a client's interrupt handler can cancel a serialization call which
     caused it to block by calling AX=0D03h

See Also: AX=0D00h,AX=0D03h