https://github.com/python/cpython/commit/fa2f9a3bf87d7507a910f75fe5d2fe3d0ecb781f
commit: fa2f9a3bf87d7507a910f75fe5d2fe3d0ecb781f
branch: 3.13
author: Sam Gross <[email protected]>
committer: colesbury <[email protected]>
date: 2026-03-20T20:08:29Z
summary:
[3.13] gh-146227: Fix wrong type in _Py_atomic_load_uint16 in pyatomic_std.h
(gh-146229) (#146233)
Also fix a related issue in the pyatomic headers:
* Fix pseudo-code comment for _Py_atomic_store_ptr_release in
pyatomic.h.
(cherry picked from commit 1eff27f2c0452b3114bcf139062c87c025842c3e)
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2026-03-20-13-07-33.gh-issue-146227.MqBPEo.rst
M Include/cpython/pyatomic.h
M Include/cpython/pyatomic_std.h
diff --git a/Include/cpython/pyatomic.h b/Include/cpython/pyatomic.h
index 28029859d3df2b..71e91c8964b981 100644
--- a/Include/cpython/pyatomic.h
+++ b/Include/cpython/pyatomic.h
@@ -72,8 +72,8 @@
// def _Py_atomic_load_ptr_acquire(obj):
// return obj # acquire
//
-// def _Py_atomic_store_ptr_release(obj):
-// return obj # release
+// def _Py_atomic_store_ptr_release(obj, value):
+// obj = value # release
//
// def _Py_atomic_fence_seq_cst():
// # sequential consistency
diff --git a/Include/cpython/pyatomic_std.h b/Include/cpython/pyatomic_std.h
index 7c71e94c68f8e6..ab3a4e1c74cd64 100644
--- a/Include/cpython/pyatomic_std.h
+++ b/Include/cpython/pyatomic_std.h
@@ -459,7 +459,7 @@ static inline uint16_t
_Py_atomic_load_uint16(const uint16_t *obj)
{
_Py_USING_STD;
- return atomic_load((const _Atomic(uint32_t)*)obj);
+ return atomic_load((const _Atomic(uint16_t)*)obj);
}
static inline uint32_t
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2026-03-20-13-07-33.gh-issue-146227.MqBPEo.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2026-03-20-13-07-33.gh-issue-146227.MqBPEo.rst
new file mode 100644
index 00000000000000..11e19eb28313d6
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2026-03-20-13-07-33.gh-issue-146227.MqBPEo.rst
@@ -0,0 +1,3 @@
+Fix wrong type in ``_Py_atomic_load_uint16`` in the C11 atomics backend
+(``pyatomic_std.h``), which used a 32-bit atomic load instead of 16-bit.
+Found by Mohammed Zuhaib.
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