A hiccup to using uvloop is that it doesn't support Windows yet (https://github.com/MagicStack/uvloop/issues/14), so it can't be used in the affected environment.


I'm exploring this again for pyzmq / Jupyter, and currently investigating relying on tornado's AddThread loop functionality. It's even slightly easier for tornado, which can reasonably set the proactor-wrapper policy at IOLoop start time, which means `asyncio.get_event_loop()` returns a loop with add_reader. But pyzmq doesn't get invoked until an event loop is already running. That means the selector thread needs to work not as a wrapper of the loop itself, as in tornado's AddThreadSelector, but attached after-the-fact. Using tornado's AddThread seems to work for this, but I'm not sure that should be assumed.