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Date: Tue, 12 Dec 2000 10:50:59 +0200
From: Giorgos Keramidas <keramida@ceid.upatras.gr>
To: Mark Huizer <freebsd@dohd.org>
Cc: Alfred Perlstein <bright@wintelcom.net>,
	Dag-Erling Smorgrav <des@FreeBSD.ORG>, cvs-committers@FreeBSD.ORG,
	cvs-all@FreeBSD.ORG
Subject: Re: cvs commit: src/etc crontab
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References: <200012101254.eBACsZu99303@freefall.freebsd.org> <20001210052846.E16205@fw.wintelcom.net> <20001210171009.B1675@hades.hell.gr> <20001211182239.B20131@eeyore.local.dohd.org>
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In-Reply-To: <20001211182239.B20131@eeyore.local.dohd.org>; from freebsd@dohd.org on Mon, Dec 11, 2000 at 06:22:40PM +0100
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On Mon, Dec 11, 2000 at 06:22:40PM +0100, Mark Huizer wrote:
...
> > This will make sure that the succession of scripts will start at 03:01
> > and run (in this order), daily -> weekly -> monthly.  The rules that I
> > followed are:
...
> 
> Isn't it kind of easier to let periodic use a lock in /var/lock or
> something and synchronize that way?

After all the discussion with lock files, I am not sure there is a
`correct' way to make sure than a crontab entry can lock out others or
have them put in a queue.  I seem to prefer letting cron do the checking
and scheduling of jobs.

I am re-reading through the thread of the lockfiles though, to see if I
can come up with something that will use lockfiles only for running
`periodic daily'.   If daily takes more than a full day on a machine to
run, it will probably fire up a second time before the first one finishes,
if crontab doesn't use lockfiles.

On the other hand, on a machine where daily takes more than a day to run,
well.. there will eventually appear other problems too.

- giorgos


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