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From: gwyn%brl-vld@sri-unix.UUCP
Newsgroups: net.unix-wizards
Subject: Re:  Unix philosophy
Message-ID: <11817@sri-arpa.UUCP>
Date: Mon, 19-Sep-83 13:52:11 EDT
Article-I.D.: sri-arpa.11817
Posted: Mon Sep 19 13:52:11 1983
Date-Received: Fri, 23-Sep-83 23:12:07 EDT
Lines: 10

From:      Doug Gwyn (VLD/VMB) <gwyn@brl-vld>

Bell UNIX (System V) does include IPC in the form of semaphores,
shared memory, and message passing.  Berkeley UNIX (4.2BSD) includes
sockets.  The problem I see is that no one known form of IPC or
process synchronization mechanism is best for all applications.

A "semaphore" device driver was distributed long ago on a USENIX
tape; this seems like the simplest semi-portable addition one could
make to a deficient UNIX in order to give it semaphores.