Example of signaling and creating a python daemon

[David Pratt]

Hi.  I am running a zope server.  Zope runs 4 threads and I have a 
document processing method that can require minutes to run so I do not 
want to run out of threads.  A solution to this is to run this process 
asynchronously.  What I am hoping to do is send a signal to a python 
deamon to run a process and then go back to sleep.

I am hoping to find a clear example of:
	*  sending a signal from a python script to start a python daemon 
somewhere on the filesystem
	*  a python daemon that utilizes the signal to wake up from sleep and 
run a method, then go back to sleep.

I have no experience daemonizing a script so this help would be much 
appreciated.  I have found a couple of scripts googling on creating a 
deemon but not work in this way.

Regards,
David