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From: ka@spanky.UUCP
Newsgroups: net.unix-wizards
Subject: Re: another argument against shared libraries
Message-ID: <441@spanky.UUCP>
Date: Mon, 15-Aug-83 14:14:13 EDT
Article-I.D.: spanky.441
Posted: Mon Aug 15 14:14:13 1983
Date-Received: Tue, 16-Aug-83 20:57:59 EDT
References: <4149@sri-arpa.UUCP>
Organization: Bell Labs, Holmdel, N. J.
Lines: 9

Adding shared memory to System V involved neither a complete redesign of
major chunks of the kernel, nor did it involve a bizarre and ugly hack.
UNIX has had the ability to share read only text segments between processes
for a long time.  Adding shared data segments required *adding* code to
various pieces of the kernel to support the shared segments; in particular
the code which sets up the page tables for a process now has to include
entries to map the segements into the process's address space.  But little
if any code had to be *changed*.
					Kenneth Almquist