Re: Ensure only single application instance.

On Aug 29, 11:25 pm, Uberman <bhoo...@xxxxxxxxxxx> wrote:
On Fri, Aug 29, 2008 at 6:51 AM, Heston James <heston_ja...@xxxxxxxxxx> wrote:
Good afternoon all.

I have an application/script which is launched by crontab on a regular
basis. I need an effective and accurate way to ensure that only one instance
of the script is running at any one time.


The following is taken from the getmail FAQ -

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If you need to prevent two instances of getmail from running
simultaneously, use any standard Unix method of providing a mutex for
this purpose. One example would be to run getmail under a program like
setlock (part of the daemontools package). Change your script or
crontab file to invoke getmail like this:

/path/to/setlock -n /path/to/lockfile /path/to/getmail [getmail
options]

There are other programs that provide functionality similar to
setlock.
------------------------------------------

HTH

Frank Millman
.