python
diff --git a/‎Misc/NEWS.d/next/Library/2021-06-15-13-51-25.bpo-42972.UnyYo1.rst
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+2Lines changed: 2 additions & 0 deletions b/‎Misc/NEWS.d/next/Library/2021-06-15-13-51-25.bpo-42972.UnyYo1.rst
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+2Lines changed: 2 additions & 0 deletions
diff --git a/‎Modules/_threadmodule.c
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+10-1Lines changed: 10 additions & 1 deletion b/‎Modules/_threadmodule.c
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+10-1Lines changed: 10 additions & 1 deletion
@@ -0,0 +1,2 @@
+The _thread.RLock type now fully implement the GC protocol: add a traverse
+function and the :const:`Py_TPFLAGS_HAVE_GC` flag. Patch by Victor Stinner.
@@ -327,6 +327,14 @@ typedef struct {
     PyObject *in_weakreflist;
 } rlockobject;
 
+static int
+rlock_traverse(rlockobject *self, visitproc visit, void *arg)
+{
+    Py_VISIT(Py_TYPE(self));
+    return 0;
+}
+
+
 static void
 rlock_dealloc(rlockobject *self)
 {
@@ -579,13 +587,14 @@ static PyType_Slot rlock_type_slots[] = {
     {Py_tp_alloc, PyType_GenericAlloc},
     {Py_tp_new, rlock_new},
     {Py_tp_members, rlock_type_members},
+    {Py_tp_traverse, rlock_traverse},
     {0, 0},
 };
 
 static PyType_Spec rlock_type_spec = {
     .name = "_thread.RLock",
     .basicsize = sizeof(rlockobject),
-    .flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
+    .flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_BASETYPE,
     .slots = rlock_type_slots,
 };
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+The _thread.RLock type now fully implement the GC protocol: add a traverse`
	`2`	+function and the :const:`Py_TPFLAGS_HAVE_GC` flag. Patch by Victor Stinner.