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exceptions (GH-132129) (#132275)
gh-132063: ensure that `ProcessPoolExecutor` does not swallow falsey exceptions (GH-132129)
(cherry picked from commit 933c6653cba235b3af2250bb19713694b560c367)
Co-authored-by: Duprat <yduprat@gmail.com>
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(#131091)
The weak reference may not be immediately dead.
(cherry picked from commit 19081158713526a3042c2ad3c6d5a589579b420f)
Co-authored-by: Sam Gross <colesbury@gmail.com>
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Check `my_object_collected.wait()` in a loop to give the main thread a
chance to merge the reference count fields. Additionally, call
`my_object_collected.set()` in a background thread to avoid deadlocking
when the destructor is called asynchronously via the eval breaker
within the body of of `my_object_collected.wait()`.
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Biased reference counting maintains two refcount fields in each object:
`ob_ref_local` and `ob_ref_shared`. The true refcount is the sum of these two
fields. In some cases, when refcounting operations are split across threads,
the ob_ref_shared field can be negative (although the total refcount must be
at least zero). In this case, the thread that decremented the refcount
requests that the owning thread give up ownership and merge the refcount
fields.
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requires_resource('walltime') (GH-108480)
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Convert test_concurrent_futures to a package of sub-tests.
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