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1. DinoV

   added

   type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

   topic-free-threading

   on Jan 17, 2024
2. kumaraditya303 commented on Jul 1, 2025

   

   kumaraditya303

   on Jul 1, 2025

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   tp_flags - most of these that change at runtime are probably protected by locks after MRO (e.g. Py_TPFLAGS_VALID_VERSION_TAG and various flags set while readying). But at least some get modified outside of the lock still (e.g. Py_TPFLAGS_IS_ABSTRACT, Py_TPFLAGS_SEQUENCE and Py_TPFLAGS_MAPPING via the abc module). These should maybe all be atomic and/ors or protected by the same type lock.
   tp_watched - also needs atomic and/or in PyType_Watch and PyType_Unwatch

   I think both of the issues are fixed now:

   1. the type slot thread safety fixed the thread safety of tp_flags. gh-127266: avoid data races when updating type slots v2 #133177
   2. PyType_Watch is now documented to be thread unsafe. gh-131544: Update docs for PyType_AddWatcher #132015
3. kumaraditya303 commented on Jul 1, 2025

   

   kumaraditya303

   on Jul 1, 2025

   Contributor

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   Closing as it is fixed on main branch.
4. kumaraditya303

   closed this as not plannedon Jul 1, 2025