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Article #3441Re: Why fork? (long, was Re: IBM PC prehistory)
From: Peter da Silva
Date: Thu, 18 Jan 1990 16:03
Date: Thu, 18 Jan 1990 16:03
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> Actually, the Berkley folks have a system call vfork(), which does the
> fork/exec in one operation. But of course, it is not compatible with Sys V.
I thought it sort of deferred the actual fork until the exec occurred, just
duplicating the file table and other "cheap" resources.
And of course once you have a VM system fork() is just fine and vfork() is
a meaningless optimisation. Just mark all the data pages copy-on-write. So
why didn't they put vfork() in 2BSD?
--
_--_|\ Peter da Silva. +1 713 274 5180. <peter@ficc.uu.net>.
/ \
\_.--._/ Xenix Support -- it's not just a job, it's an adventure!
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!lavaca.uh.edu!uhnix1!sugar!ficc!peter From: peter@ficc.uu.net (Peter da Silva) Newsgroups: comp.arch Subject: Re: Why fork? (long, was Re: IBM PC prehistory) Message-ID: <IC51D77xds13@ficc.uu.net> Date: 18 Jan 90 16:03:51 GMT References: <610@ssp11.idca.tds.philips.nl> <952@dms.UUCP> <1239@cirrusl.UUCP> Reply-To: peter@ficc.uu.net (Peter da Silva) Organization: Xenix Support, FICC Lines: 9