[ale] Only one process

[Geoffrey]

scott wrote:
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> 
> 
> On Jun 4, 2010, at 8:49 PM, JK wrote:
> 
>> Doesn't anybody worry about race conditions any more?  How do you 
>> defend against multiple copies of this script running
>> simultaneously? Of course, cron *shouldn't* ever do that...
>> 
>> flock(1) seems relevant:
>> 
>> http://linux.die.net/man/1/flock
>> 
>> -- JK
> 
> when I write scripts that I dont want to run in parallel.  I check
> for a /var/run/*.pid file related to the script and if the PID in it
> isnt mine, then I abort out. if the file isnt there, I create it with
> my PID.  And when the script exits it removes the file.

Interesting approach, but I was just looking for a pid associated with 
thunderbird there and it does not exist.;)  (Sending this from thunderbird)

-- 
Until later, Geoffrey

"I predict future happiness for America if they can prevent
the government from wasting the labors of the people under
the pretense of taking care of them."
- Thomas Jefferson