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[mypyc] Add note about librt.strings thread safety #21383

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JukkaL merged 1 commit into from
Apr 30, 2026
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[mypyc] Add note about librt.strings thread safety #21383

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8 changes: 8 additions & 0 deletions mypyc/doc/librt_strings.rst
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Expand Up @@ -9,6 +9,14 @@ low-level string and bytes utilities.
Classes
-------

Thread safety
^^^^^^^^^^^^^

``BytesWriter`` and ``StringWriter`` objects are unsafe to access from another
thread if they are concurrently modified (on free-threaded Python builds). They are optimized
for maximal performance, and they aren't fully synchronized. Read-only access from multiple
threads is safe.

BytesWriter
^^^^^^^^^^^

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