Yeah, CSP is awesome.

The traditional thing to do here is to use immutable data structures; because they can never change, you don't need locks to access them, which means you can pass pointers between threads willy-nilly. And if you're sending a message to a process that doesn't share memory, you can fall back to serialisation.

Bear in mind that you can still get race conditions and deadlocks with CSP --- consider a process which provides `get` and `set` messages, and then two other processes try to do `c.set(c.get() + 1)`.