Do you want to lock between processes or just threads? If it's just between 
threads you can just put the lock in a module instead of a model file. 
Models are executed again on every request so you're creating a new Lock 
each time so threads will be locking different lock instances. Between 
processes you can use Dave's suggestion or you can use portalocker which 
web2py includes.

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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