Date: Fri, 15 Dec 2000 11:35:47 -0800 (PST) From: John Baldwin <jhb@FreeBSD.org> To: Bernd Walter <ticso@cicely5.cicely.de> Cc: freebsd-alpha@FreeBSD.org Subject: RE: mb and wmb in atomic_ Message-ID: <XFMail.001215113547.jhb@FreeBSD.org> In-Reply-To: <20001215193443.B62048@cicely5.cicely.de>
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On 15-Dec-00 Bernd Walter wrote: > Why are the mb and wmb operations needed in the atomic_ functions? > If I understood it correctly the locked operations are in synced > with others CPUs and there is no memory operation beside the variable > itself. They should probably only be used with the 'acq' and 'rel' variants. Hmm, btw, it looks like I have the order of the barriers in the 'acq' and 'rel' variants wrong. The barriers should be on the inside, not the outside. Anyone disagree? -- John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/ PGP Key: http://www.baldwin.cx/~john/pgpkey.asc "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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