Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!decwrl!decvax!ima!haddock!karl
From: karl@haddock.ima.isc.com (Karl Heuer)
Newsgroups: comp.lang.c
Subject: Re: C optimizer
Keywords: C pure function optimization
Message-ID: <11859@haddock.ima.isc.com>
Date: 23 Feb 89 21:48:59 GMT
References: <515@larry.UUCP> <9648@smoke.BRL.MIL> <36034@bbn.COM> <3121@ficc.uu.net> <1028@frog.UUCP>
Reply-To: karl@haddock.ima.isc.com (Karl Heuer)
Organization: Interactive Systems, Boston
Lines: 12

In article <1028@frog.UUCP> john@frog.UUCP (John Woods) writes:
>In article <3121@ficc.uu.net>, peter@ficc.uu.net (Peter da Silva) writes:
>>Can anyone think of any pure system calls?
>
>[What about getpid()?]

Nope.
	register int i = getpid();
	if (fork() != 0) exit(0);
	if (getpid() != i) printf("impure!\n");

Karl W. Z. Heuer (ima!haddock!karl or karl@haddock.isc.com), The Walking Lint