From aad13be35f837e2888e975ea67db63af32ce1836 Mon Sep 17 00:00:00 2001
From: Thomas Tanon <thomas@pellissier-tanon.fr>
Date: Sun, 10 May 2026 15:13:51 +0200
Subject: [PATCH] DateTime: use more relaxed ordering constraints

Follow up to #6026
---
 pyo3-ffi/src/datetime.rs | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/pyo3-ffi/src/datetime.rs b/pyo3-ffi/src/datetime.rs
index fc9d693beb5..e967541335e 100644
--- a/pyo3-ffi/src/datetime.rs
+++ b/pyo3-ffi/src/datetime.rs
@@ -604,12 +604,12 @@ pub const PyDateTime_CAPSULE_NAME: &CStr = c"datetime.datetime_CAPI";
 /// `PyDateTime_IMPORT` is called
 #[inline]
 pub unsafe fn PyDateTimeAPI() -> *mut PyDateTime_CAPI {
-    PyDateTimeAPI_impl.load(core::sync::atomic::Ordering::SeqCst)
+    PyDateTimeAPI_impl.load(Ordering::Acquire)
 }
 
 /// Populates the `PyDateTimeAPI` object
 pub unsafe fn PyDateTime_IMPORT() {
-    if PyDateTimeAPI_impl.load(Ordering::SeqCst).is_null() {
+    if PyDateTimeAPI_impl.load(Ordering::Relaxed).is_null() {
         // PyPy expects the C-API to be initialized via PyDateTime_Import, so trying to use
         // `PyCapsule_Import` will behave unexpectedly in pypy.
         #[cfg(PyPy)]
@@ -628,8 +628,8 @@ pub unsafe fn PyDateTime_IMPORT() {
         let _ = PyDateTimeAPI_impl.compare_exchange(
             ptr::null_mut(),
             py_datetime_c_api,
-            Ordering::SeqCst,
-            Ordering::SeqCst,
+            Ordering::Release,
+            Ordering::Relaxed,
         );
     }
 }