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From: masscomp@soma.UUCP
Newsgroups: mod.computers.masscomp
Subject: Shared memory examples sought
Message-ID: <923@soma.UUCP>
Date: Tue, 17-Jun-86 00:29:53 EDT
Article-I.D.: soma.923
Posted: Tue Jun 17 00:29:53 1986
Date-Received: Sat, 21-Jun-86 04:11:54 EDT
Reply-To: soma!rice!trejo@nprdc (Len Trejo)
Organization: Masscomp Users' Society
Lines: 19
Approved: masscomp@soma.uucp


	We would like to link two concurrent processes in a real-time 
application using shared memory.  One process simultaneously sends 
data to and receives data from the data acquisition and control 
processor in short bursts (1 to 2 s) separated by pseudo-random 
intervals (3 s avg.).  The other process runs an interactive 
graphical simulation on an independent graphics processor (IGP).  
This simulation runs as a large display list in IGP memory that 
updates itself on the fly by reading display information from 
registers in the host memory.  The host updates these registers once 
every second.  We want the data-acquisition process to change two of 
the registers in host memory that the simulation process uses.  To 
us, shared memory seems to be the fastest and surest way of doing this.
	None of us has experience with shared memory programming.  So
we seek information and examples that would be helpful to us in 
linking these processes together.

Len Trejo (for Neuroscience Group).
NPRDC arpa: trejo@nprdc		Phone: (619) 225-7424/7627