thfuture.py

import threading

from tornado import gen
from tornado.concurrent import Future
from tornado.ioloop import IOLoop


fut = Future()
#print("in main:", fut, id(getattr(fut, '_loop', None)))

@gen.coroutine
def f():
    loop = IOLoop.current()
    loop.call_later(1, fut.set_result, None)
    #print("in thread:", id(loop.asyncio_loop), id(getattr(fut, '_loop', None)))
    assert (yield fut) is None

t = threading.Thread(target=IOLoop().run_sync, args=(f,))
t.start()
t.join()