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Date:      Thu, 8 Feb 2001 18:37:52 -0800
From:      Alfred Perlstein <bright@wintelcom.net>
To:        Bernd Walter <ticso@cicely5.cicely.de>
Cc:        freebsd-current@FreeBSD.ORG
Subject:   Re: atomic_ question
Message-ID:  <20010208183752.F26076@fw.wintelcom.net>
In-Reply-To: <20010208182106.B80741@cicely5.cicely.de>; from ticso@cicely5.cicely.de on Thu, Feb 08, 2001 at 06:21:07PM %2B0100
References:  <20010208182106.B80741@cicely5.cicely.de>

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* Bernd Walter <ticso@cicely5.cicely.de> [010208 09:21] wrote:
> Are atomic_* implementations allowed to spin/sleep?
> The question is because some platforms don't have atomic operations
> for adding and so on (e.g. sparcv8).

Actually, you can use atomic_* on sparc, but you're limited to
24 bits.

> The only way to implement them on these platforms is to use a lock.
> Now I'm wonder if the use of a sleep mutex is allowed or is a simple
> spinning lock the sensefull choice.

Either one would work.

-- 
-Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org]
"I have the heart of a child; I keep it in a jar on my desk."


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