Sharing hashes between processes

Hey, Suppose that I wanted to make a hash persistent so that it's contents were shared between processes. Does the persistence mechanism keep a single copy and protect access to it using semaphores, or is it more like the mySQL pconnect way where a currently idle connection is used instead? What I have in mind is a file-contents cache in order to speed up the performance of a templating system. Can I use a (true) global hash table in my extension and do everything via the persistent version of emalloc, or do I have to consider something else? I realize that there might not be a huge increase in performance, but it would be nice to know how to do it so that if we needed that bit of extra speed, we could get it. --Wez.