linux-kernel - Re: [take25 1/6] kevent: Description.

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Message-ID: <45662206.1070104@redhat.com>
Date:	Thu, 23 Nov 2006 14:34:46 -0800
From:	Ulrich Drepper <drepper@...hat.com>
To:	Hans Henrik Happe <hhh@...da.sdu.dk>
CC:	Evgeniy Polyakov <johnpol@....mipt.ru>,
	David Miller <davem@...emloft.net>,
	Andrew Morton <akpm@...l.org>, netdev <netdev@...r.kernel.org>,
	Zach Brown <zach.brown@...cle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Chase Venters <chase.venters@...entec.com>,
	Johann Borck <johann.borck@...sedata.com>,
	linux-kernel@...r.kernel.org, Jeff Garzik <jeff@...zik.org>
Subject: Re: [take25 1/6] kevent: Description.

Hans Henrik Happe wrote:
> I don't know if this falls under the simplification, but wouldn't there be a 
> race when reading/copying the event data? I guess this could be solved with 
> an extra user index. 

That's what I said, reading the value from the ring buffer structure's 
head would be racy.  All this can only work for single threaded code.

-- 
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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