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GH-93179: Document the thread safety of functools.lru_cache #96101

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Aug 21, 2022
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GH-93179: Document the thread safety of functools.lru_cache #96101

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6 changes: 6 additions & 0 deletions Doc/library/functools.rst
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Expand Up @@ -49,6 +49,9 @@ The :mod:`functools` module defines the following functions:
>>> factorial(12) # makes two new recursive calls, the other 10 are cached
479001600

The cache is threadsafe so the wrapped function can be used in multiple
threads.

.. versionadded:: 3.9


Expand Down Expand Up @@ -140,6 +143,9 @@ The :mod:`functools` module defines the following functions:
*maxsize* most recent calls. It can save time when an expensive or I/O bound
function is periodically called with the same arguments.

The cache is threadsafe so the wrapped function can be used in multiple
threads.

Since a dictionary is used to cache results, the positional and keyword
arguments to the function must be hashable.

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