Making sure script only runs once instance at a time.

Matthew Warren Matthew.Warren at
Fri Sep 29 16:10:22 CEST 2006



	From: at
[ at] On
Behalf Of Hari Sekhon
	Sent: 29 September 2006 14:55
	To: python-list at
	Subject: Re: Making sure script only runs once instance at a
	I'm not sure if that is a very old way of doing it, which is why
I was reluctant to do it. My way actually uses the process list of the
os (linux) and counts the number of instances. If it is more than 0 then
another process is running and the script exits gracefully.
	Also, apart from the fact the using lockfiles feels a bit 1970s,
I have found that in real usage of other programs within the company
that use lockfiles, it sometimes causes a bit of troubleshooting time
when it stops working due to a stale lockfile. This especially happens
when the program is killed, the lockfile remains and causes minor
annoyance (to somebody who knows that is, more annoyance to somebody who

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