INT 21 - Novell NetWare - SYNCHRONIZATION SERVICES - WAIT ON SEMAPHORE
AX = C502h
CX:DX = semaphore handle
BP = timeout limit in timer ticks (1/18 sec)
0000h return immediately if semaphore already zero or negative
Return: AL = status
00h successful
FEh timeout
FFh invalid handle
Desc:   decrement the semaphore's value, optionally waiting until its value
becomes positive before decrementing
Note:   this function is supported by NetWare 4.6+, Advanced NetWare 1.0+, and
Alloy NTNX
SeeAlso: AX=C501h,AX=C503h

See also: 21C500

21C502 - Novell NetWare - SYNCHRONIZATION SERVICES - WAIT ON SEMAPHORE