[issue32850] Run gc_collect() before complaining about dangling threads

[Nathaniel Smith]

Nathaniel Smith <njs at pobox.com> added the comment:

Yes, a PR would be better... also, the two versions of the patch appear to be identical?

CC'ing Antoine and Victor b/c they seem to have written this dangling_threads checking stuff and I'm not sure I understand it :-).

As some extra background: this is in Python's internal testing code, but @smurfix is hitting it because he's working on a third-party asyncio event loop implementation, and re-using test.asyncio to test it. I'm not sure what specifically is causing this to happen, though I guess it has something to do with how trio / trio-asyncio are using threads.

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

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nosy: +pitrou, vstinner

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