- return obj->header.user_data.set (key, data, destroy, replace);
+
+retry:
+ hb_user_data_array_t *user_data = (hb_user_data_array_t *) hb_atomic_ptr_get (&obj->header.user_data);
+ if (unlikely (!user_data))
+ {
+ user_data = (hb_user_data_array_t *) calloc (sizeof (hb_user_data_array_t), 1);
+ if (unlikely (!user_data))
+ return false;
+ user_data->init ();
+ if (unlikely (!hb_atomic_ptr_cmpexch (&obj->header.user_data, nullptr, user_data)))
+ {
+ user_data->fini ();
+ free (user_data);
+ goto retry;
+ }
+ }
+
+ return user_data->set (key, data, destroy, replace);