[3.12] gh-79033: Try to fix asyncio.Server.wait_closed() again (GH-111336) #111424
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…GH-111336) * Try to fix asyncio.Server.wait_closed() again I identified the condition that `wait_closed()` is intended to wait for: the server is closed *and* there are no more active connections. When this condition first becomes true, `_wakeup()` is called (either from `close()` or from `_detach()`) and it sets `_waiters` to `None`. So we just check for `self._waiters is None`; if it's not `None`, we know we have to wait, and do so. A problem was that the new test introduced in 3.12 explicitly tested that `wait_closed()` returns immediately when the server is *not* closed but there are currently no active connections. This was a mistake (probably a misunderstanding of the intended semantics). I've fixed the test, and added a separate test that checks exactly for this scenario. I also fixed an oddity where in `_wakeup()` the result of the waiter was set to the waiter itself. This result is not used anywhere and I changed this to `None`, to avoid a GC cycle. * Update Lib/asyncio/base_events.py --------- (cherry picked from commit 2655369) Co-authored-by: Guido van Rossum <guido@python.org> Co-authored-by: Carol Willing <carolcode@willingconsulting.com>
miss-islington
requested review from
1st1,
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gvanrossum,
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willingc
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Oct 28, 2023
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I identified the condition that
wait_closed()is intendedto wait for: the server is closed and there are no more
active connections.
When this condition first becomes true,
_wakeup()is called(either from
close()or from_detach()) and it sets_waitersto
None. So we just check forself._waiters is None; if it'snot
None, we know we have to wait, and do so.A problem was that the new test introduced in 3.12 explicitly
tested that
wait_closed()returns immediately when the serveris not closed but there are currently no active connections.
This was a mistake (probably a misunderstanding of the intended
semantics). I've fixed the test, and added a separate test that
checks exactly for this scenario.
I also fixed an oddity where in
_wakeup()the result of thewaiter was set to the waiter itself. This result is not used
anywhere and I changed this to
None, to avoid a GC cycle.(cherry picked from commit 2655369)
Co-authored-by: Guido van Rossum guido@python.org
Co-authored-by: Carol Willing carolcode@willingconsulting.com
📚 Documentation preview 📚: https://cpython-previews--111424.org.readthedocs.build/