I think you want gearmand:
http://www.danga.com/gearman/

It has a 'uniq' property that ensures only one job with a given name is running.

On 8/17/07, Derek Anderson <[EMAIL PROTECTED]> wrote:
>
> i have a number of background threads in my app, and for a few of them i
> want to make sure only one of them exist.  (not one per server thread)
>
> for instance, my bigram indexer....or my notification mailer.

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