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gh-120513: Add thread-safety warning to os.environ docs #152979

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gh-120513: Add thread-safety warning to os.environ docs #152979

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5 changes: 5 additions & 0 deletions Doc/library/os.rst
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Expand Up @@ -214,6 +214,11 @@ process and user.
cause memory leaks. Refer to the system documentation for
:c:func:`!putenv`.

.. warning::
Setting or unsetting environment variables from one thread while
another thread reads or writes them is not guaranteed to be
thread-safe and can crash the process on some platforms.

You can delete items in this mapping to unset environment variables.
:func:`unsetenv` will be called automatically when an item is deleted from
:data:`os.environ`, and when one of the :meth:`~dict.pop` or
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