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Re: PATCH: Fix ll/sc for mips

To: Hiroyuki Machida <>
Subject: Re: PATCH: Fix ll/sc for mips
From: "Maciej W. Rozycki" <>
Date: Fri, 1 Feb 2002 12:50:48 +0100 (MET)
In-reply-to: <>
Organization: Technical University of Gdansk
On Fri, 1 Feb 2002, Hiroyuki Machida wrote:

> > It will fail if *p is not same as oldval.
> 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.

 That's exactly what I meant -- "sc" may fail to execute the store, while
"cmpxchgl" may not. 

+  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
+        e-mail:, PGP key available        +

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