Making sure script only runs once instance at a time.

[Matthew Warren]

________________________________

	From: python-list-bounces+matthew.warren=digica.com at python.org
[mailto:python-list-bounces+matthew.warren=digica.com at python.org] On
Behalf Of Hari Sekhon
	Sent: 29 September 2006 14:55
	To: python-list at python.org
	Subject: Re: Making sure script only runs once instance at a
time.
	
	
	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
doesn't).
	 
	 



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