From owner-freebsd-hackers  Sat Jun 30 20:51:27 2001
Delivered-To: freebsd-hackers@freebsd.org
Received: from a.mx.everquick.net (a.mx.everquick.net [216.89.137.3])
	by hub.freebsd.org (Postfix) with ESMTP
	id A052637B405; Sat, 30 Jun 2001 20:51:21 -0700 (PDT)
	(envelope-from eddy+public+spam@noc.everquick.net)
Received: from localhost (eddy@localhost)
	by a.mx.everquick.net (8.10.2/8.10.2) with ESMTP id f613pB429235;
	Sun, 1 Jul 2001 03:51:11 GMT
X-EverQuick-No-Abuse: Report any e-mail abuse to <abuse@noc.everquick.net>
Date: Sun, 1 Jul 2001 03:51:10 +0000 (GMT)
From: "E.B. Dreger" <eddy+public+spam@noc.everquick.net>
To: Alfred Perlstein <bright@sneakerz.org>
Cc: "Michael C . Wu" <keichii@peorth.iteration.net>,
	freebsd-smp@freebsd.org, freebsd-hackers@freebsd.org
Subject: Re: Quick question: AIO / SMP / process-based threading
In-Reply-To: <20010630222829.E84523@sneakerz.org>
Message-ID: <Pine.LNX.4.20.0107010345230.29177-100000@www.everquick.net>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: owner-freebsd-hackers@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-hackers.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo?subject=subscribe%20freebsd-hackers>
List-Unsubscribe: <mailto:majordomo?subject=unsubscribe%20freebsd-hackers>
X-Loop: FreeBSD.ORG

> Date: Sat, 30 Jun 2001 22:28:29 -0500
> From: Alfred Perlstein <bright@sneakerz.org>
> 
> Can you point to some specific PRs about this or crashdumps before
> (or at least while) taking pot shots at the AIO implementation?

In the mean time, until somebody can substantiate that claim... is AIO SMP
safe?  I see that aiocb.aio_buf is declared as "volatile", so I would
presume so.

I just want to be sure that, if an aio call runs on one CPU, another CPU
can access *aio_buf and be 100% certain that the data are coherent.

aio_buf = mmap() using MAP_HASSEMAPHORE -- good idea, bad idea, pointless?


TIA,
Eddy

---------------------------------------------------------------------------

Brotsman & Dreger, Inc.
EverQuick Internet Division

Phone: +1 (316) 794-8922 Wichita/(Inter)national
Phone: +1 (785) 865-5885 Lawrence

---------------------------------------------------------------------------

Date: Mon, 21 May 2001 11:23:58 +0000 (GMT)
From: A Trap <blacklist@brics.com>
To: blacklist@brics.com
Subject: Please ignore this portion of my mail signature.

These last few lines are a trap for address-harvesting spambots.  Do NOT
send mail to <blacklist@brics.com>, or you are likely to be blocked.


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message