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[3.13] gh-91555: add warning to docs about possibility of deadlock/infinite recursion (GH-135954) (GH-135989)

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Miss Islington (bot) 2025-06-26 16:26:11 +02:00 • committed by GitHub
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Doc/library/logging.handlers.rst
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@ -1052,6 +1052,15 @@ 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