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gh-79805: Indicate that Shelve.sync() is not thread-safe #127507

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gh-79805: Indicate that Shelve.sync() is not thread-safe #127507

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7 changes: 7 additions & 0 deletions Doc/library/shelve.rst
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Expand Up @@ -78,6 +78,13 @@ Two additional methods are supported:
dictionary on disk, if feasible. This is called automatically when the shelf
is closed with :meth:`close`.

.. warning::

During the call to :meth:`!sync`, the *writeback* attribute is set to
:const:`False` and other threads will stop updating the cache. As such,
this method is **not** thread-safe.


.. method:: Shelf.close()

Synchronize and close the persistent *dict* object. Operations on a closed
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