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Int 7F Fn 00  - Alloy Ntnx, Mw386 - Semaphore Lock And Wait                [N]

   AH = 00h
   DS:DX -> ASCIZ semaphore name (max 64 bytes)

Return: AL = status (see below)
   AH = semaphore owner if status=02h

See Also: AH=01h,AH=02h,AH=41h,INT 67/AH=00h

Values for status:
 00h   successful
 01h   invalid function
 02h   semaphore already locked
 03h   unable to lock/unlock semaphore
 04h   semaphore space exhausted
 05h   host/target PC did not respond (NTNX)
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