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From: abs@nbc1.UUCP
Newsgroups: comp.unix.wizards
Subject: Question about Sys V shared memory
Message-ID: <314@nbc1.UUCP>
Date: Mon, 23-Mar-87 17:28:19 EST
Article-I.D.: nbc1.314
Posted: Mon Mar 23 17:28:19 1987
Date-Received: Thu, 26-Mar-87 01:14:43 EST
Organization: NBC Computer Imaging, New York, NY
Lines: 25

The situation:

I have a large shared memory segment.  I would like to be able to
have a dynamic data structure within that segment, i.e. set aside
some memory within the shm segment for allocation, and have one
or more pointers within the shm segment pointing into this memory
pool.

The question:

If process A attaches the shm segment and assigns an address within
the segment's memory pool to one of these pointers, will this
address have any meaning to other processes that attach the
segment?

My guess:

Theoretically, no.  Practically, I would guess it depends on how
segmentation is done within the host machine.  (We have a VAX
running ULTRIX.)

Any help would be appreciated.  Thanks.
-- 
Andrew Siegel, N2CN		NBC Computer Imaging, New York, NY
philabs!nbc1!andy		(212)664-5776