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From: tma@progress.COM (Tim Atchison)
Newsgroups: comp.unix.aix
Subject: cs system call on RS/6000
Summary: cs system call on RS/6000
Keywords: test-and-set cs tas RS/6000
Message-ID: <1990Dec6.183659.1712@progress.com>
Date: 6 Dec 90 18:36:59 GMT
Sender: news@progress.com (The News User)
Organization: Progress Software Corp., Bedford, MA
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I am looking for a test-and-set instruction (or something like it) on the
IBM RS/6000. I know that the assembly code is proprietary, but I found a 
compare-and-set (cs) system call that looks like it does the same thing.
Unfortunately, I can't find this command in my doc set. Could someone show
me how to use this call ?

The only information that I have is:

int cs (int *dest, int compare, int value)

It has the following logic:

if (compare == *dest) {*dest = value; return(0);}
else return(1);

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Timothy M. Atchison			UUCP: mit-eddie!progress!tma
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