shared memory and process synchronization
Noel Bell
chcu275 at ut-emx.UUCP
Thu Feb 25 17:12:01 AEST 1988
I am using SCO XENIX 2.1 to read and write data on an IEEE-488 GPIB
interface. The XENIX op. sys. runs on an AT which serves as a
supervisor to a XT slave. The reads are set up to occur at a specific
time interval. The writes occur at a specific time interval but also
can occur at arbitrary times.
What is the best way to synchronize this GPIB activity? Should I use
"sdwaitv" with shared memory to delay action until the current read or
write leaves the shared memory? ( I think this would be similar to
using semaphores on Sys 3 which are not supported on Sys V. according
to my manuals. )
I would appreciate any advice on this matter. Also, are there any good
references for process control on UNIX/XENIX systems that provide more
info. than the SCO or UNIX Sys.V manuals.
Thanks in advance for any suggestions provided.
Noel Bell
Department of Chemical Engineering
Univ. of Texas at Austin
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