run asyncio without disrupting other code?

example.py

import asyncio
import contextlib


@asyncio.coroutine
def my_coroutine(loop, text):
    p = yield from asyncio.create_subprocess_shell("echo " + text, loop=loop)
    yield from p.communicate()


def my_function():
    loop = asyncio.new_event_loop()
    watcher = asyncio.SafeChildWatcher()
    asyncio.set_child_watcher(watcher)
    watcher.attach_loop(loop)
    with contextlib.closing(watcher):
        loop.run_until_complete(my_coroutine(loop, "in func"))

asyncio.get_event_loop().run_until_complete(my_coroutine(None, "toplevel"))
my_function()
# BUG! This hangs.
asyncio.get_event_loop().run_until_complete(my_coroutine(None, "toplevel"))