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Title: GH-149142: Fix decimal `mpd_context_t.status` race in free-threading by LindaSummer · Pull Request #150598 · python/cpython · GitHub

Open Graph Title: GH-149142: Fix decimal `mpd_context_t.status` race in free-threading by LindaSummer · Pull Request #150598 · python/cpython

X Title: GH-149142: Fix decimal `mpd_context_t.status` race in free-threading by LindaSummer · Pull Request #150598 · python/cpython

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

Open Graph Description: Issue GH-149142 Proposed Changes Add mutex in free-threading build to guard the PyDecContextObject.ctx.status. It solves the race in concurrent dec_addstatus and clear_flags. Comment For other flag...

X Description: Issue GH-149142 Proposed Changes Add mutex in free-threading build to guard the PyDecContextObject.ctx.status. It solves the race in concurrent dec_addstatus and clear_flags. Comment For other flag...

Opengraph URL: https://github.com/python/cpython/pull/150598

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fix: fix decimal.Context.status race in free-threadinghttps://github.com/python/cpython/pull/150598/commits/31bbc40a2b31381e3b13f0a59070844b1b698805
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fix comment changeshttps://github.com/python/cpython/pull/150598/commits/71397b22cd29b069ba047f2f5766ae5811c3f728
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add guard for free threadinghttps://github.com/python/cpython/pull/150598/commits/5676be42f93abbfa3fe0dcdc56992c7605aa1d1d
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_decimal: mpd_context_t::status/traps mutated non-atomically leading to data race #149142 https://github.com/python/cpython/issues/149142
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revert useless changehttps://github.com/python/cpython/pull/150598/commits/64d4fcb9b0087890fa76dc92f40958bb5d89f72f
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May 30, 2026https://github.com/python/cpython/pull/150598#issuecomment-4582044448
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Merge branch 'main' into fix/decimal_ctx_statushttps://github.com/python/cpython/pull/150598/commits/d598e3c48314cfcec68875a1c6858f6c5d6983ce
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