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Title: gh-141594: A free-threaded JIT (Part 1) by Fidget-Spinner · Pull Request #141595 · python/cpython · GitHub

Open Graph Title: gh-141594: A free-threaded JIT (Part 1) by Fidget-Spinner · Pull Request #141595 · python/cpython

X Title: gh-141594: A free-threaded JIT (Part 1) by Fidget-Spinner · Pull Request #141595 · python/cpython

Description: The Python programming language. Contribute to python/cpython development by creating an account on GitHub.

Open Graph Description: This PR gives the JIT free-threading support. It is only on for single-threaded code, and turns off automatically on multi-threaded code. All JIT features are turned on, including the optimizer. Al...

X Description: This PR gives the JIT free-threading support. It is only on for single-threaded code, and turns off automatically on multi-threaded code. All JIT features are turned on, including the optimizer. Al...

Opengraph URL: https://github.com/python/cpython/pull/141595

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gh-141594: A free-threaded JIT (Part 1)https://github.com/python/cpython/pull/141595#top
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JIT x Free-Threading #141594https://github.com/python/cpython/issues/141594
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November 13, 2025 21:17https://github.com/python/cpython/pull/141595#commits-pushed-6a3bd75
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fix JIT invalidation mechanism for FThttps://github.com/python/cpython/pull/141595/commits/725894d0c73dd673071c1df98a1e6ad784546499
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fix re-entrant finalizershttps://github.com/python/cpython/pull/141595/commits/1e5713debbaed34de8b967344bc1a8936d6192c1
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cleanup a littlehttps://github.com/python/cpython/pull/141595/commits/67de7d6a14f4c20443396a16c6adc97912bf3cb5
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fix JIT buildshttps://github.com/python/cpython/pull/141595/commits/e1f1b307c085213dc3e3e17b1776e3ac48409488
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only clear at endhttps://github.com/python/cpython/pull/141595/commits/53c5e1d278ed7f3131b1e1e62265b0758aa5dd65
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remove locks in JIT codehttps://github.com/python/cpython/pull/141595/commits/cc38ee4afea40e8e4b1f06459fbc80d05e294bee
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fix a few bugshttps://github.com/python/cpython/pull/141595/commits/f8fefb334d65e9d0087cd32a556dd0946638d74f
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set immortal before GChttps://github.com/python/cpython/pull/141595/commits/fa9910826b350c1147923554c37213a587e20725
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November 15, 2025 16:28https://github.com/python/cpython/pull/141595#event-20962569727
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Lib/test/test_capi/test_opt.pyhttps://github.com/python/cpython/pull/141595/files/fcfed9670245f839cfee3302d155ad4b8dcf68c0#diff-67b5bd915e37f77df79907865982648172c27d3b96fbb072b30a73c6a2735439
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December 16, 2025 22:43https://github.com/python/cpython/pull/141595#commits-pushed-8190a5c
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Merge remote-tracking branch 'upstream/main' into jit_fthttps://github.com/python/cpython/pull/141595/commits/8190a5ccfe034a9b013c011f1ae1a1d637a4d6d3
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disable DCE pass for nowhttps://github.com/python/cpython/pull/141595/commits/973e9616de94e171644ed67d7af39a869f91ffd7
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comment out object lockshttps://github.com/python/cpython/pull/141595/commits/e08c4340f4d60a3361c552739355e02ffe7dc81e
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enable GIL on JIThttps://github.com/python/cpython/pull/141595/commits/00ae7b5e6377fb0967bcb7afd45c10533b87fff9
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Merge remote-tracking branch 'upstream/main' into jit_fthttps://github.com/python/cpython/pull/141595/commits/4d9ffa1825e664ce3e69adfb302f0815690523f4
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fix upstream mergeshttps://github.com/python/cpython/pull/141595/commits/a1ca3a71c4ba8ede868823af4ddea5a020c49931
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minor fixupshttps://github.com/python/cpython/pull/141595/commits/cdbbbe318ae827a3bd92704958d91a9cc11a6285
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Fix a bughttps://github.com/python/cpython/pull/141595/commits/0678505d99733ca5b2ca5c0dee4e02dc473d6c0c
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Merge remote-tracking branch 'upstream/main' into jit_fthttps://github.com/python/cpython/pull/141595/commits/dc1e25c25e13df9811c6563262fc42c027d78945
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Merge remote-tracking branch 'upstream/main' into jit_fthttps://github.com/python/cpython/pull/141595/commits/c2416a69340cbfce458ae50116793e4974c3aff1
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Address review commentshttps://github.com/python/cpython/pull/141595/commits/65b6dd0e5d3b6addccd66c8f178f54b20bebc342
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reduce diffhttps://github.com/python/cpython/pull/141595/commits/7d9743790277002586eb957f0ac808da44615390
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fix buildhttps://github.com/python/cpython/pull/141595/commits/1a4f2d042e3c73bfdd45980e5d6e834a90bda13e
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Add a testhttps://github.com/python/cpython/pull/141595/commits/24949651f5fff435a92fc31c1aa0f3ab8524b2b3
2494965https://github.com/python/cpython/pull/141595/commits/24949651f5fff435a92fc31c1aa0f3ab8524b2b3
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reduce diffhttps://github.com/python/cpython/pull/141595/commits/aff296a96e2aa17cab132a8775d64c6f83047367
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Merge remote-tracking branch 'upstream/main' into jit_fthttps://github.com/python/cpython/pull/141595/commits/8df9aed162354ebbe247fb137bc6226904efee32
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check env var when re-enablinghttps://github.com/python/cpython/pull/141595/commits/fb56baae87485ba8c54c1c8b0ad8bbec6c3ed288
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fix warningshttps://github.com/python/cpython/pull/141595/commits/5d987e82724b53c92fdbfb74225b7588994bd356
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