fix run_async demo

examples/run_async.py

@@ -3,6 +3,7 @@ from sanic.response import json
 from multiprocessing import Event
 from signal import signal, SIGINT
 import asyncio
+import uvloop
 
 app = Sanic(__name__)
 
@@ -10,10 +11,11 @@ app = Sanic(__name__)
 async def test(request):
     return json({"answer": "42"})
 
+asyncio.set_event_loop(uvloop.new_event_loop())
 server = app.create_server(host="0.0.0.0", port=8001)
 loop = asyncio.get_event_loop()
 task = asyncio.ensure_future(server)
-signal(SIGINT, lambda s, f: loop.close())
+signal(SIGINT, lambda s, f: loop.stop())
 try:
     loop.run_forever()
 except:

sanic/server.py

@@ -297,6 +297,7 @@ def serve(host, port, request_handler, error_handler, before_start=None,
     :param protocol: Subclass of asyncio protocol class
     :return: Nothing
     """
+    if not run_async:
         loop = async_loop.new_event_loop()
         asyncio.set_event_loop(loop)