From owner-freebsd-current@FreeBSD.ORG  Wed Feb  2 17:44:23 2005
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 1A2DA16A4CE
	for <current@freebsd.org>; Wed,  2 Feb 2005 17:44:23 +0000 (GMT)
Received: from pimout1-ext.prodigy.net (pimout1-ext.prodigy.net
	[207.115.63.77])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 72C9243D48
	for <current@freebsd.org>; Wed,  2 Feb 2005 17:44:22 +0000 (GMT)
	(envelope-from julian@elischer.org)
Received: from jules (adsl-216-100-134-143.dsl.snfc21.pacbell.net
	[216.100.134.143])j12Hi5GS066976;	Wed, 2 Feb 2005 12:44:10 -0500
Date: Wed, 2 Feb 2005 09:44:05 -0800 (PST)
From: Julian Elischer <julian@elischer.org>
X-X-Sender: julian@localhost
To: Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
In-Reply-To: <200502011913.j11JDXsf084862@khavrinen.lcs.mit.edu>
Message-ID: <20050202094256.K88344@localhost>
References: <20050201101113.J572@localhost>
	<20050201190318.GE45608@cirb503493.alcatel.com.au>
	<200502011913.j11JDXsf084862@khavrinen.lcs.mit.edu>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
cc: Peter Jeremy <PeterJeremy@optushome.com.au>
cc: current@freebsd.org
Subject: Re: cynchronised sleep capbilty..
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 02 Feb 2005 17:44:23 -0000

very clever!

however it doesn't phaselock to teh time and still drifts.
I need to trigger on (for example) 10 second boundaries across 50
synchronised machines..
(so thatthe machines agree about the sampling period.)


-- 
+------------------------------------+       ______ _  __
|   __--_|\  Julian Elischer         |       \     U \/ / hard at work in
|  /       \ julian@elischer.org     +------>x   USA    \ a very strange
| (   OZ    )                                \___   ___ | country !
+- X_.---._/    presently in San Francisco       \_/   \\
          v

On Tue, 1 Feb 2005, Garrett Wollman wrote:

> <<On Wed, 2 Feb 2005 06:03:18 +1100, Peter Jeremy <PeterJeremy@optushome.com.au> said:
>
> > 2) <kludge>Write a small C program that uses setitimer() and signals
> >    its parent whenever the timer triggers.  Run it in the background
> >    and just pause within the sh loop.</kludge>
>
> SIGCHLD is good enough.
>
> while :; do
> 	sleep 10 &
> 	do_something
> 	wait
> done
>
> -GAWollman
>
> _______________________________________________
> freebsd-current@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-current
> To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"
>