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I've been playing around a bit with the Tornado web server and have come to a point where I want to stop the web server (for example during unit testing). The following simple example exists on the Tornado web page : import tornado.ioloop import tornado.web class MainHandler(tornado.web.RequestHandler): def get(self): self.write("Hello, world") application = tornado.web.Application([ (r"/", MainHandler), ]) if __name__ == "__main__": application.listen(8888) tornado.ioloop.IOLoop.instance().start() Once tornado.ioloop.IOLoop.instance().start() is called, it blocks the program (or current thread). Reading the source code for the IOLoop object gives this example in the documentation for the stop function: To use asynchronous methods from otherwise-synchronous code (such as unit tests), you can start and stop the event loop like this: ioloop = IOLoop() async_method(ioloop=ioloop, callback=ioloop.stop) ioloop.start() ioloop.start() will return after async_method has run its callback, whether that callback was invoked before or after ioloop.start. However, I have no idea how to integrate this into my program. I actually have a class that encapsulates the web server (having it's own start and stop functions), but as soon as I call start, the program (or tests) will of course block anyway. I've tried to start the web server in another process (using the multiprocessing package). This is the class that is wrapping the web server: class Server: def __init__(self, port=8888): self.application = tornado.web.Application([ (r"/", Handler) ]) def server_thread(application,

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