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From: briand@rfengr.com (Brian Dear)
Newsgroups: comp.os.mach
Subject: shared memory in Mach?  (Esp. for NeXT)
Message-ID: <1991Feb21.072121.24132@rfengr.com>
Date: 21 Feb 91 07:21:21 GMT
Reply-To: brian@coconut.com
Organization: Coconut Computing, Inc., La Jolla, California
Lines: 24


Forgive me if this is a stupid question.  Here goes:

My first exposure to Mach is via the NeXT machine.  One thing I was
disappointed to discover was that with NeXT's OS, there is no support
for "shared memory" operations such as System V's shmget(), shmat(),
and shmdt().
 
Does anyone know if a simple way to implement the equivalent of
AT&T System V shared memory in a Mach-style environment?  Mach is
supposed to be quite powerful with regard to interprocess communication.
What's the *easiest* way to have two unrelated processes share a chunk
of memory by attaching it to their address space and reading/writing it?
Assume the processes are not children of each other.  I want one
process to be able to communicate with a completely unrelated process
using the fastest method possible (which I assume would be some 
direct memory operation).

Any suggestions welcome.  If you would like to respond via e-mail,
please reply to: brian@coconut.com

Thanks!

Brian Dear                  brian@coconut.com          Coconut Computing, Inc.


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