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[3.13] gh-109070: Document that get_context in multiprocessing have side effect (GH-136341) #136344

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Merged
gpshead merged 1 commit into from
Jul 6, 2025
Merged

[3.13] gh-109070: Document that get_context in multiprocessing have side effect (GH-136341) #136344

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12 changes: 7 additions & 5 deletions 12 Doc/library/multiprocessing.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -1079,7 +1079,9 @@ Miscellaneous
Return a context object which has the same attributes as the
:mod:`multiprocessing` module.

If *method* is ``None`` then the default context is returned.
If *method* is ``None`` then the default context is returned. Note that if
the global start method has not been set, this will set it to the
default method.
Otherwise *method* should be ``'fork'``, ``'spawn'``,
``'forkserver'``. :exc:`ValueError` is raised if the specified
start method is not available. See :ref:`multiprocessing-start-methods`.
Expand All @@ -1090,10 +1092,10 @@ Miscellaneous

Return the name of start method used for starting processes.

If the start method has not been fixed and *allow_none* is false,
then the start method is fixed to the default and the name is
returned. If the start method has not been fixed and *allow_none*
is true then ``None`` is returned.
If the global start method has not been set and *allow_none* is
``False``, then the start method is set to the default and the name
is returned. If the start method has not been set and *allow_none* is
``True`` then ``None`` is returned.

The return value can be ``'fork'``, ``'spawn'``, ``'forkserver'``
or ``None``. See :ref:`multiprocessing-start-methods`.
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