window10 ProactorEventLoop does't not exit normally when task has finished

[woshimanong1990]

Long story short

Expected behaviour

`# coding:utf-8

import aiohttp
import asyncio

async def fetch(session, url):
async with session.get(url) as response:
return await response.text()

async def main():
async with aiohttp.ClientSession() as session:
html = await fetch(session, 'http://python.org')
print(html)

loop = asyncio.ProactorEventLoop()
asyncio.set_event_loop(loop)
loop = asyncio.get_event_loop()
loop.run_until_complete(main())`

It exits normalley; However, when I use SelectorEventLoop, it works!

Actual behaviour

In face ,the program does't not exit; When I write result to a file, the content is not written to file;

It does't exit; when I attempt to close the loop, Error happen;
Exception ignored in: <bound method _ProactorBasePipeTransport.__del__ of <_ProactorSocketTransport closing fd=836 read=<_OverlappedFuture cancelled>>> Traceback (most recent call last): File "d:\software\programe\python35\Lib\asyncio\proactor_events.py", line 96, in __del__ self.close() File "d:\software\programe\python35\Lib\asyncio\proactor_events.py", line 84, in close self._loop.call_soon(self._call_connection_lost, None) File "d:\software\programe\python35\Lib\asyncio\base_events.py", line 572, in call_soon self._check_closed() File "d:\software\programe\python35\Lib\asyncio\base_events.py", line 357, in _check_closed raise RuntimeError('Event loop is closed') RuntimeError: Event loop is closed Exception ignored in: <bound method _ProactorBasePipeTransport.__del__ of <_ProactorSocketTransport closing fd=876 read=<_OverlappedFuture cancelled>>> Traceback (most recent call last): File "d:\software\programe\python35\Lib\asyncio\proactor_events.py", line 96, in __del__ self.close() File "d:\software\programe\python35\Lib\asyncio\proactor_events.py", line 84, in close self._loop.call_soon(self._call_connection_lost, None) File "d:\software\programe\python35\Lib\asyncio\base_events.py", line 572, in call_soon self._check_closed() File "d:\software\programe\python35\Lib\asyncio\base_events.py", line 357, in _check_closed raise RuntimeError('Event loop is closed') RuntimeError: Event loop is closed

Steps to reproduce

run the code
`# coding:utf-8

import aiohttp
import asyncio

async def fetch(session, url):
async with session.get(url) as response:
return await response.text()

async def main():
async with aiohttp.ClientSession() as session:
html = await fetch(session, 'http://python.org')
print(html)

loop = asyncio.ProactorEventLoop()
asyncio.set_event_loop(loop)
loop = asyncio.get_event_loop()
loop.run_until_complete(main())
loop.close()`

Your environment

window10 + python 3.5.3

[aio-libs-bot]

GitMate.io thinks the contributor most likely able to help you is @asvetlov.

Possibly related issues are #376 (ProactorEventLoop hangs ), #1559 (Lingering close doesn't terminate before timeout), #2038 (add_route does not allow **kwargs), #3075 (trust_env doesn't works), and #2309 (WebSocketResponse does not throw/close when connection is abruptly cut).

[woshimanong1990]

Now try to run the same code on python 3.7.1. Unbelievably, it seem to run normally. Maybe it's a python bug!

[woshimanong1990]

python 3.6.5 also works!

[woshimanong1990]

I think it's a bug!

[asvetlov]

Several proactor problems were fixed in 3.6
You report definitely is not related to aiohttp itself, closing it.

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a [new issue] for related bugs.
If you feel like there's important points made in this discussion, please include those exceprts into that [new issue].
[new issue]: https://github.com/aio-libs/aiohttp/issues/new