Shutting down thread with Socket blocking for connection

[Regan Heath]

A more efficient approach is to use async socket routines and an event  
object.

So, in main you create a shared event object, then start the listen thread.
In listen you call an async select or accept, and then wait on that /and/  
the shared event object.

To stop listen you set the shared event, which wakes it, and it notices  
the event is set and performs the cleanup/stops itself.

I'm not sure if phobos has support for this sort of thing yet, but you  
could always leverage the underlying C library.  I may be able to offer  
some pointers on Windows, but I haven't done something like this on any  
unix platform for a while..

Regan