WorkerThread

server: the HTTP Server which spawned this thread, and which owns the

Queue and is placing active connections into it.

ready: a simple flag for the calling server to know when this thread

has begun polling the Queue.

Due to the timing issues of polling a Queue, a WorkerThread does not check its own 'ready' flag after it has started. To stop the thread, it is necessary to stick a _SHUTDOWNREQUEST object onto the Queue (one for each running WorkerThread).