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I guess my confusion is related to the word "job".
You are really just talking about a command or a
program. Not a job as such.

----- Original Message -----
From: Hall, Philip <phall@spss.com>
To: <midrange-l@midrange.com>
Sent: Tuesday, April 09, 2002 12:08 PM
Subject: RE: Monitor for existing job.


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> > And how would you prevent another
> > one with the same simple name but
> > using completely different resources
> > to run or maybe it would be ok to run
> > this as there is no conflict.
>
> This brings us back full circle to what Mike wanted, a way to ensure that
if
> the job was already running that a duplicate couldn't be run at the same
> time.
>
> The various answers all described that the code in the job create some kind
> of semaphore/mutex/flag that is only live while the job runs - if a second
> copy tries to run, it will see the 'in-use' and quit.
>
> Lots of jobs do this kind of thing (sometimes explicitly, sometimes not),
on
> many OS's.
>
> --phil
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