Making sure script only runs once instance at a time.

Tim Williams tim at
Fri Sep 29 19:22:39 CEST 2006

On 29/09/06, Fredrik Lundh <fredrik at> wrote:
> Tim Williams wrote:
> > So that I know my mistake, which bit fails (the text from
> > sys.exc_info()[1]?? ) , or is it all complete rubbish - and not
> > do-able -  on a *nix system ?
> opening a file for writing doesn't lock it on Unix.  if you want
> locking, you need other mechanisms, and I'm not sure any of them
> work properly on all configurations, under all circumstances.
> (there's a reason why people are still using "1970s technology"
> to do locking on Unix...)

Thanks for that Fredrik


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