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bpo-37261: Fix support.catch_unraisable_exception() (GH-14052)

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The __exit__() method of test.support.catch_unraisable_exception
context manager now ignores unraisable exception raised when clearing
self.unraisable attribute.
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Victor Stinner 2019-06-13 14:44:54 +02:00 • committed by GitHub
parent 63ab4ba07b
commit 6d22cc8e90
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3 changed files with 35 additions and 2 deletions
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12
Doc/library/test.rst
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@ -1086,6 +1086,18 @@ The :mod:`test.support` module defines the following functions:
Context manager catching unraisable exception using
:func:`sys.unraisablehook`.
If the *object* attribute of the unraisable hook is set and the object is
being finalized, the object is resurrected because the context manager
stores a strong reference to it (``cm.unraisable.object``).
Storing the exception value (``cm.unraisable.exc_value``) creates a
reference cycle. The reference cycle is broken explicitly when the context
manager exits.
Exiting the context manager clears the stored unraisable exception. It can
trigger a new unraisable exception (ex: the resurrected object is finalized
again and raises the same exception): it is silently ignored in this case.
Usage::
with support.catch_unraisable_exception() as cm: