[Twisted-Python] shared list in factory, mutexes?

[Gabriel Rossetti]

Hello,

I have to have a shared list in a server's factory to keep client 
registration info. I had been using python's mutex class to make sure 
only one registration at a time can be done. I just realized that this 
is blocking and that's a no-no with twisted. My question is what would 
be a better way of doing this?

Gabriel