linux-kernel - Re: Why Semaphore Hardware-Dependent?

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Message-ID: <Pine.LNX.4.64.0608290855510.18031@schroedinger.engr.sgi.com>
Date:	Tue, 29 Aug 2006 08:56:36 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	David Howells <dhowells@...hat.com>
cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Arjan van de Ven <arjan@...radead.org>,
	Dong Feng <middle.fengdong@...il.com>, ak@...e.de,
	Paul Mackerras <paulus@...ba.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: Why Semaphore Hardware-Dependent? 

On Tue, 29 Aug 2006, David Howells wrote:

> Because i386 (and x86_64) can do better by using XADDL/XADDQ.

And Ia64 would like to use fetchadd....

> CMPXCHG is not available on all archs, and may not be implemented on all archs
> through other atomic instructions.

Which arches do not support cmpxchg?
 
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