Date: Wed, 2 Feb 2005 09:44:05 -0800 (PST) From: Julian Elischer <julian@elischer.org> To: Garrett Wollman <wollman@khavrinen.lcs.mit.edu> Cc: current@freebsd.org Subject: Re: cynchronised sleep capbilty.. Message-ID: <20050202094256.K88344@localhost> In-Reply-To: <200502011913.j11JDXsf084862@khavrinen.lcs.mit.edu> References: <20050201101113.J572@localhost> <20050201190318.GE45608@cirb503493.alcatel.com.au> <200502011913.j11JDXsf084862@khavrinen.lcs.mit.edu>
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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.)
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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
>
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