Implement shutdown_default_executor()

[agronholm]

• uvloop version: 0.14.0
• Python version: 3.9.0b1
• Platform: Linux
• Can you reproduce the bug with PYTHONASYNCIODEBUG in env?: yes
• Does uvloop behave differently from vanilla asyncio? How?: yes – vanilla asyncio implements this method

Python 3.9 added a new mandatory method to the AbstractEventLoop interface, named shutdown_default_executor(). This method is crucial for asyncio.run() to work. If it's absent, asyncio.run() will fail with a NotImplementedError when performing the shutdown cleanup.

Related CPython issue: https://bugs.python.org/issue34037

[aeros]

Seeing as I added loop.shutdown_default_executor() to asyncio, I wouldn't mind working on this issue. Unless someone else specifically wants to work on this, feel free to assign me and I should be able to find the time within the next couple of weeks or so.

(Note that this would be my first issue for uvloop)

[1st1]

Kyle, feel free to work on this.

[aeros]

Sorry for the delay on this. I've been a bit otherwise occupied and had some local issues with installing cython in the virtual environment (due to an OS problem where libffi.so.6 was not present). I just resolved the issue earlier today and should have time to open a PR for this issue within the next week or so.

[1st1]

np!

[agronholm]

Really nice to have this. How soon can we expect a new uvloop release?

[1st1]

I'll try to do one around 3.9 release. Sorry, i'm extremely busy these days.

[agronholm]

Python 3.9.0 has been released already so it would be really nice to get this done.

[pilosus]

It would be super nice to have this fix released! Can't wait to switch over Python 3.9.0 )

[hauntsaninja]

Thank you for uvloop! I'd love to see this released; if there's anything blocking the release I'd be happy to help :-)

[1st1]

I'm a bit busy with releasing EdgeDB b1. We should do that in a week or two and then it will be a priority for me to release uvloop (and migrate EdgeDB itself to 3.9).

[NotoriousRebel]

Any updates?

[agronholm]

EdgeDB b1 isn't out yet. I wouldn't expect anything to happen before that.