From eb20a7d12c4b2ab7931074843f8602a48b5b07bd Mon Sep 17 00:00:00 2001
From: Donghee Na <donghee.na@python.org>
Date: Fri, 26 Apr 2024 00:13:57 +0900
Subject: [PATCH] gh-112069: Do not require lock if the set has never been
 exposed. (gh-118069)

---
 Objects/setobject.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Objects/setobject.c b/Objects/setobject.c
index 0d88f4ff922..19975e3d4d1 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -2333,6 +2333,13 @@ set_init(PySetObject *self, PyObject *args, PyObject *kwds)
     if (!PyArg_UnpackTuple(args, Py_TYPE(self)->tp_name, 0, 1, &iterable))
         return -1;
 
+    if (Py_REFCNT(self) == 1 && self->fill == 0) {
+        self->hash = -1;
+        if (iterable == NULL) {
+            return 0;
+        }
+        return set_update_local(self, iterable);
+    }
     Py_BEGIN_CRITICAL_SECTION(self);
     if (self->fill)
         set_clear_internal(self);