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Re: [libc-alpha] Re: PATCH: Fix ll/sc for mips

To: Hiroyuki Machida <machida@sm.sony.co.jp>
Subject: Re: [libc-alpha] Re: PATCH: Fix ll/sc for mips
From: Kaz Kylheku <kaz@ashi.footprints.net>
Date: Thu, 31 Jan 2002 20:02:25 -0800 (PST)
Cc: <hjl@lucon.org>, <macro@ds2.pg.gda.pl>, <libc-alpha@sources.redhat.com>, <linux-mips@oss.sgi.com>
In-reply-to: <20020201.123523.50041631.machida@sm.sony.co.jp>
Sender: owner-linux-mips@oss.sgi.com
On Fri, 1 Feb 2002, Hiroyuki Machida wrote:
> Please note that "sc" may fail even if nobody write the
> variable. (See P.211 "8.4.2 Load-Linked/Sotre-Conditional" of "See 
> MIPS RUN" for more detail.) 
> So, after your patch applied, compare_and_swap() may fail, even if
> *p is equal to oldval.

I can't think of anything that will break because of this, as long
as the compare_and_swap eventually succeeds on some subsequent trial.
If the atomic operation has to abort for some reason other than *p being
unequal to oldval, that should be cool.


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