How to prevent a stack from loading twice (in Linux)

[Scott Morrow]

I love being surprised by learning something that my brain is ready  
for but that I wasn't expecting or looking to learn.  In the past I've  
used a file mechanism when needing to lock out another instance.  The  
shell() and socket ideas are far enough outside my comfort zone that I  
wouldn't have looked for a solution there.  Thanks for the poke in the  
brain.

Scott Morrow
Elementary Software
(Now with 20% less chalk dust!)

On May 23, 2009, at 6:33 AM, Bernard Devlin wrote:
>
> Peter, you could also use shell() to parse the output of the ps  
> command to check if your application is already running...<snip>
>
> Bernard
>
> Or you can open a server socket on a fixed port, and quit if you  
> fail to grab that port... <snip>
>
> Jan Schenkel