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GH-94398: TaskGroup: Fail create_task() during shutdown (GH-94400)

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Once the task group is shutting down, it should not be possible to create a new task.
Here "shutting down" means `self._aborting` is set, indicating that at least one task
has failed and we have cancelled all others.

Co-authored-by: Łukasz Langa <lukasz@langa.pl>
This commit is contained in:
Guido van Rossum 2022-06-30 10:10:46 -07:00 • committed by GitHub
parent 4261b6bffc
commit 594c369949
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4 changed files with 27 additions and 4 deletions
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Lib/asyncio/taskgroups.py
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@ -138,6 +138,8 @@ class TaskGroup:
raise RuntimeError(f"TaskGroup {self!r} has not been entered")
if self._exiting and not self._tasks:
raise RuntimeError(f"TaskGroup {self!r} is finished")
if self._aborting:
raise RuntimeError(f"TaskGroup {self!r} is shutting down")
if context is None:
task = self._loop.create_task(coro)
else: