A GThreadedSocketService is a simple subclass of GSocketService
that handles incoming connections by creating a worker thread and
dispatching the connection to it by emitting the ::run signal in
the new thread. The signal handler may perform blocking IO and need not return
until the connection is closed. The service is implemented using a thread pool, so there is a
limited amount of threads availible to serve incomming requests.
The service automatically stops the GSocketService from accepting
new connections when all threads are busy. As with GSocketService, you may connect to "run",
or subclass and override the default handler.