From owner-freebsd-hackers  Thu Jul 26 15:10:43 2001
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Date: Thu, 26 Jul 2001 15:11:00 -0700
From: Arun Sharma <arun@sharmas.dhs.org>
To: Bernd Walter <ticso@mail.cicely.de>
Cc: 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>
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In-Reply-To: <20010726235927.B2249@cicely20.cicely.de>; from ticso@mail.cicely.de on Thu, Jul 26, 2001 at 11:59:27PM +0200
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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.

	-Arun

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