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From: brownell@harvard.ARPA (Dave Brownell)
Newsgroups: net.unix-wizards
Subject: Re: UNIX V  11/70 vs VAX differences
Message-ID: <287@harvard.ARPA>
Date: Thu, 21-Jun-84 22:21:43 EDT
Article-I.D.: harvard.287
Posted: Thu Jun 21 22:21:43 1984
Date-Received: Sat, 23-Jun-84 06:34:03 EDT
References: <544@ihuxa.UUCP>, <6200029@uokvax.UUCP>
Organization: Sequoia Systems Inc., Marlborough Mass.
Lines: 12

Apologies if this has been posted before.

System V on Vexen and PDP11s also have different implementations of
shared memory.  The Vax version has real segments that you can put
anywhere, with IPC protection mechanisms; the PDP11 version is has a
different interface, substituting filesystem protections for the IPC
ones.  Also, segment sizes on the PDP11 are fixed at 4k, while
they're variable in full System V implementations.


Dave Brownell
{allegra,floyd,ihnp4,seismo}!harvard!brownell