[Haskell] Discrete event simulation

[Jake Luck]

> Part of this will be some kind of synchronisation primitive.  I don't 
> much care what it is, but somewhere I need a way to make a process wait 
> until something happens rather than just a constant time.

Paul, what you have described sounds like a reactive system. Have you 
looked into AFRP/Yampa? Although it is based on a continuous time model 
simulation, it might just work for your scenario nicely. jake