From: Kumar Aditya <kumaraditya@python.org>
Date: Wed, 2 Apr 2025 14:31:05 +0000 (+0530)
Subject: gh-132013: use relaxed atomics in hash of frozenset (#132014)
X-Git-Tag: v3.14.0a7~99
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=76f6b5e64a8b6ea5a88606f3665cd9f52c2c2798;p=thirdparty%2FPython%2Fcpython.git

gh-132013: use relaxed atomics in hash of frozenset (#132014)

Use relaxed atomics in hash of `frozenset` to fix TSAN warning.
---

diff --git a/Objects/setobject.c b/Objects/setobject.c
index 5ad83c3f1633..f65d458f7924 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -793,12 +793,12 @@ frozenset_hash(PyObject *self)
     PySetObject *so = _PySet_CAST(self);
     Py_uhash_t hash;
 
-    if (so->hash != -1) {
-        return so->hash;
+    if (FT_ATOMIC_LOAD_SSIZE_RELAXED(so->hash) != -1) {
+        return FT_ATOMIC_LOAD_SSIZE_RELAXED(so->hash);
     }
 
     hash = frozenset_hash_impl(self);
-    so->hash = hash;
+    FT_ATOMIC_STORE_SSIZE_RELAXED(so->hash, hash);
     return hash;
 }