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gh-126548: Add a thread-unsafety warning for importlib.reload() #136704

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Jul 16, 2025
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gh-126548: Add a thread-unsafety warning for importlib.reload() #136704

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4 changes: 4 additions & 0 deletions Doc/library/importlib.rst
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Expand Up @@ -206,6 +206,10 @@ Functions
:exc:`ModuleNotFoundError` is raised when the module being reloaded lacks
a :class:`~importlib.machinery.ModuleSpec`.

.. warning::
This function is not thread-safe. Calling it from multiple threads can result
in unexpected behavior. It's recommended to use the :class:`threading.Lock`
or other synchronization primitives for thread-safe module reloading.

:mod:`importlib.abc` -- Abstract base classes related to import
---------------------------------------------------------------
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