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gh-91555: add warning to docs about possibility of deadlock/infinite recursion #135954

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Jun 26, 2025
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gh-91555: add warning to docs about possibility of deadlock/infinite recursion #135954

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gh-91555: add warning to docs about possibility of deadlock/infinite …
duaneg Jun 25, 2025
866be79
Update Doc/library/logging.handlers.rst
duaneg Jun 26, 2025
46a26b1
Change whitespace.
vsajip Jun 26, 2025
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9 changes: 9 additions & 0 deletions Doc/library/logging.handlers.rst
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Expand Up @@ -1059,6 +1059,15 @@ possible, while any potentially slow operations (such as sending an email via
.. note:: If you are using :mod:`multiprocessing`, you should avoid using
:class:`~queue.SimpleQueue` and instead use :class:`multiprocessing.Queue`.

.. warning::

The :mod:`multiprocessing` module uses an internal logger created and
accessed via :meth:`~multiprocessing.get_logger`.
:class:`multiprocessing.Queue` will log ``DEBUG`` level messages upon
items being queued. If those log messages are processed by a
:class:`QueueHandler` using the same :class:`multiprocessing.Queue` instance,
it will cause a deadlock or infinite recursion.

.. method:: emit(record)

Enqueues the result of preparing the LogRecord. Should an exception
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