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gh-116720: Fix corner cases of taskgroups (#117407)

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This prevents external cancellations of a task group's parent task to
be dropped when an internal cancellation happens at the same time.
Also strengthen the semantics of uncancel() to clear self._must_cancel
when the cancellation count reaches zero.

Co-Authored-By: Tin Tvrtković <tinchester@gmail.com>
Co-Authored-By: Arthur Tacca
This commit is contained in:
Guido van Rossum 2024-04-09 08:17:28 -07:00 • committed by GitHub
parent 22b25d1eba
commit fa58e75a86
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8 changed files with 183 additions and 13 deletions
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Modules/_asynciomodule.c
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@ -2393,6 +2393,9 @@ _asyncio_Task_uncancel_impl(TaskObj *self)
{
if (self->task_num_cancels_requested > 0) {
self->task_num_cancels_requested -= 1;
if (self->task_num_cancels_requested == 0) {
self->task_must_cancel = 0;
}
}
return PyLong_FromLong(self->task_num_cancels_requested);
}