In article <[EMAIL PROTECTED]>,
Uberman <[EMAIL PROTECTED]> wrote:
>On Fri, Aug 29, 2008 at 6:51 AM, Heston James <[EMAIL PROTECTED]> 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.
>
>You could create a named pipe in /tmp with a unique (static) name and
>permissions that disallow any kind of read/write access. Then simply have
>your script check for its existence when it starts. If it exists, then
>another instance of your script is running, and just terminate. Make sure
>your original instance removes the pipe when it exits.
I'll write an article on this subject this fall. The
essentials are:
A. There's no canonical answer; every apparent solution
has problems;
B. The suggestions offered you are certainly among the
popular ones;
C. My personal favorite is to open a (network) socket
server. For reasons I'll eventually explain, this
has particularly apt semantics under Unix.
--
http://mail.python.org/mailman/listinfo/python-list
