Implementing new eventloops

[Ronald Oussoren]

Hi,

Is there documentation on how to implement new eventloops for asyncio? In particular, I intend to write an eventloop implementation for a GUI library (PyObjC).

Ronald

[Guido van Rossum]

That's a great idea. I don't think we have docs for this, but the source of the event loop is pretty accessible. Yury has implemented a replacement event loop in C (or was it C++?), "uvloop" so he probably has a more useful answer.

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--Guido van Rossum (python.org/~guido)

[Andrew Svetlov]

Also there is a well supported https://github.com/harvimt/quamash project for running asyncio on Qt event loop.

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Thanks,

Andrew Svetlov

[Ronald Oussoren]

Thanks.  I already expected that I’d have to look the source code, and having different implementations to look at will definitely help.

Ronald

[Nathaniel Smith]

[Re-sending this to just the list in an attempt to appease Google
Groups; apologies for any duplicates.]

On this subject, one thing that would also be really useful is some
kind of shared test suite. I know there's Victor's aiotest, and we're
using it in trio-asyncio [1], but I'm not sure how reliable it
actually is, given that it mostly hasn't been touched since 2014 and
afaict asyncio itself doesn't use it. OTOH CPython's
Lib/test/test_asyncio/ is presumably reliable since it's maintained
and used, but I don't know how to use it to test a third party event
loop.

I'd love to hear what strategies other third party loops are using.

-n

[1] https://github.com/python-trio/trio-asyncio

--
Nathaniel J. Smith -- https://vorpus.org

[Tamás Bajusz]

On Sunday, October 29, 2017 at 12:48:57 PM UTC+1, Ronald Oussoren wrote:

Hi,

Is there documentation on how to implement new eventloops for asyncio? In particular, I intend to write an eventloop implementation for a GUI library (PyObjC).

You may be interested to read this also: Integrate tkinter and asyncio (and async)