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From: tim@ism780c.UUCP (Tim Smith)
Newsgroups: comp.arch,comp.unix.wizards,comp.os.minix
Subject: Re: Free Software Foundation (was: Re: Mach, the new standard?)
Message-ID: <7399@ism780c.UUCP>
Date: Tue, 29-Sep-87 19:49:13 EDT
Article-I.D.: ism780c.7399
Posted: Tue Sep 29 19:49:13 1987
Date-Received: Sun, 4-Oct-87 20:51:34 EDT
References: <1665@ncr-sd.SanDiego.NCR.COM> <8381@utzoo.UUCP> <797@Pescadero.ARPA> <7672@felix.UUCP> <840@usfvax2.UUCP>
Reply-To: tim@ism780c.UUCP (Tim Smith)
Organization: Interactive Systems Corp., Santa Monica CA
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Xref: mnetor comp.arch:2438 comp.unix.wizards:4592 comp.os.minix:1757

In article <840@usfvax2.UUCP> chips@usfvax2.UUCP (Chip Salzenberg) writes:
< For example, I use an editor that forks twice as preparation for running
< an area of text through a filter; that really _is_ expensive, since our editor
< is quite large.  (No, not emassive :-}; the Rand editor `E'.)

Forking does not have to be expensive for large programs.  Fork should
just increase the reference counts on the text pages and data pages, and
change all data pages to be read-only.  Only copy pages that get a write
fault.
-- 
Tim Smith, Knowledgian		{sdcrdcf,uunet}!ism780c!tim
				tim@ism780c.isc.com
"Oh I wish I were Matthew Wiener, That is who I truly want to be,
 'Cause if I were Matthew Wiener, Tim Maroney would send flames to me"