From owner-freebsd-hackers  Thu Jul 26 15:30:22 2001
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Date: Fri, 27 Jul 2001 00:30:05 +0200
From: Bernd Walter <ticso@mail.cicely.de>
To: Arun Sharma <arun@sharmas.dhs.org>
Cc: Bernd Walter <ticso@mail.cicely.de>, hackers@FreeBSD.ORG
Subject: Re: Need a clean room implementation of this function
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References: <20010726135913.A23052@sharmas.dhs.org> <20010726231540.A2249@cicely20.cicely.de> <20010726142106.A23171@sharmas.dhs.org> <20010726235927.B2249@cicely20.cicely.de> <20010726151100.D23264@sharmas.dhs.org>
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In-Reply-To: <20010726151100.D23264@sharmas.dhs.org>; from arun@sharmas.dhs.org on Thu, Jul 26, 2001 at 03:11:00PM -0700
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On Thu, Jul 26, 2001 at 03:11:00PM -0700, Arun Sharma wrote:
> On Thu, Jul 26, 2001 at 11:59:27PM +0200, Bernd Walter wrote:
> > [...]
> > ATOMIC_ASM(set,      char,  "orb %b2,%0",   v)
> > ATOMIC_ASM(clear,    char,  "andb %b2,%0", ~v)
> > [...]
> 
> That does set, not test-and-set. What I want is exactly what the Intel
> BTS instruction does: atomically test and set a bit.

Ops - but as John Baldwin already showed that cmpset/cmpclear are also
part of atomic.h
Using the atomic.h functions gives you the ability to port it to alpha
and other FreeBSD architectures.

-- 
B.Walter              COSMO-Project         http://www.cosmo-project.de
ticso@cicely.de         Usergroup           info@cosmo-project.de


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