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GeezerVison is showing github.com — [3.14] gh-140061: Use `_PyObject_IsUniquelyReferenced()` to check if objects are uniquely referenced (gh-140062) by miss-islington · Pull Request #140157 · python/cpython

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@miss-islington

@miss-islington miss-islington commented Oct 15, 2025 •
edited by bedevere-app Bot
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The previous Py_REFCNT(x) == 1 checks can have data races in the free
threaded build. _PyObject_IsUniquelyReferenced(x) is a more conservative
check that is safe in the free threaded build and is identical to
Py_REFCNT(x) == 1 in the default GIL-enabled build.
(cherry picked from commit 32c2649)

Co-authored-by: Sergey Miryanov [email protected]

  • Issue: Use _PyObject_IsUniquelyReferenced instead of Py_REFCNT(x) == 1 for free-threaded compatibility #140061

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@sergey-miryanov @miss-islington
pythongh-140061: Use _PyObject_IsUniquelyReferenced() to check if o…
2b285c1 
…bjects are uniquely referenced (pythongh-140062)

The previous `Py_REFCNT(x) == 1` checks can have data races in the free
threaded build. `_PyObject_IsUniquelyReferenced(x)` is a more conservative
check that is safe in the free threaded build and is identical to
`Py_REFCNT(x) == 1` in the default GIL-enabled build.
(cherry picked from commit 32c2649)

Co-authored-by: Sergey Miryanov <[email protected]>
@miss-islington
miss-islington requested review from markshannon, methane and rhettinger as code owners October 15, 2025 13:48
@bedevere-app bedevere-app Bot mentioned this pull request Oct 15, 2025
Use _PyObject_IsUniquelyReferenced instead of Py_REFCNT(x) == 1 for free-threaded compatibility #140061
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@bedevere-app bedevere-app Bot added the awaiting review label Oct 15, 2025
@bedevere-app bedevere-app Bot mentioned this pull request Oct 15, 2025
GH-140061: Use _PyObject_IsUniquelyReferenced to check if object is uniquely referenced #140062
Merged
@colesbury
colesbury enabled auto-merge (squash) October 15, 2025 13:49
@colesbury
colesbury merged commit 045e349 into python:3.14 Oct 15, 2025
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@bedevere-app bedevere-app Bot removed the awaiting review label Oct 15, 2025
@miss-islington
miss-islington deleted the backport-32c2649-3.14 branch January 2, 2026 17:03
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@rhettinger rhettinger Awaiting requested review from rhettinger rhettinger is a code owner
@methane methane Awaiting requested review from methane methane is a code owner
@markshannon markshannon Awaiting requested review from markshannon markshannon is a code owner

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3 participants

@miss-islington @colesbury @sergey-miryanov
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