gh-145235: Make dict watcher API thread-safe for free-threaded builds#145233
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yoney wants to merge 5 commits intopython:mainfrom
Open
gh-145235: Make dict watcher API thread-safe for free-threaded builds#145233yoney wants to merge 5 commits intopython:mainfrom
yoney wants to merge 5 commits intopython:mainfrom
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yoney
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yoney
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ericsnowcurrently,
markshannon,
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colesbury
reviewed
Feb 25, 2026
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@colesbury Thank you for the review. I’ve addressed the comments. |
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Could we please add the |
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This PR is stale because it has been open for 30 days with no activity. |
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In free-threaded builds, concurrent calls to
PyDict_AddWatcher,PyDict_ClearWatcher,PyDict_Watch, andPyDict_Unwatchcan race on the shared callback array and the per-dict watcher tags. This change adds a mutex to serialize watcher registration and removal, atomic operations for tag updates, and atomic acquire/release synchronization for callback dispatch in_PyDict_SendEvent.Note: Before this change, running
test.test_free_threading.test_dict_watcheremitted tsan warnings in the free-threaded tsan build.cc: @colesbury @mpage @DinoV