From: Arjan van de Ven <arjan@infradead.org>
To: Joseph Seigh <jseigh_02@xemaps.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: What does atomic_read actually do?
Date: Sat, 18 Dec 2004 20:54:40 +0100 [thread overview]
Message-ID: <1103399680.4127.20.camel@laptopd505.fenrus.org> (raw)
In-Reply-To: <opsi7xcuizs29e3l@grunion>
On Sat, 2004-12-18 at 14:20 -0500, Joseph Seigh wrote:
> I mean atomic in the either old or new sense. I'm wondering what
> guarantees
> the atomicity. Not the C standard. I can see the gcc compiler uses a MOV
> instruction to load the atomic_t from memory which is guaranteed atomic by
> the architecture if aligned properly. But gcc does that for any old int
> as far as I can see, so why use atomic_read?
it does so on *x86*.
On other architectures, something else might be needed..
also it makes the api more symetric as well.
next prev parent reply other threads:[~2004-12-18 19:55 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-18 16:23 Joseph Seigh
2004-12-18 17:11 ` Paolo Ornati
2004-12-18 18:14 ` Joseph Seigh
2004-12-18 18:34 ` Arjan van de Ven
2004-12-18 19:20 ` Joseph Seigh
2004-12-18 19:39 ` Joe Korty
2004-12-18 19:54 ` Arjan van de Ven [this message]
2004-12-18 20:43 ` Joseph Seigh
2004-12-18 21:03 ` Brian Gerst
2004-12-19 22:21 ` Robert Love
2004-12-19 23:50 ` Joseph Seigh
2004-12-20 11:51 ` Arjan van de Ven
2004-12-20 12:52 ` Andrea Arcangeli
2004-12-20 20:51 ` Joseph Seigh
2004-12-18 20:47 ` Brian Gerst
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