update stellar thread main loop

src/session/session.cpp

@@ -181,6 +181,17 @@ enum udp_state session_get_udp_state(const struct session *sess)
     return sess->udp_state;
 }
 
+// session user data
+void session_set_user_data(struct session *sess, void *user_data)
+{
+    sess->user_data = user_data;
+}
+
+void *session_get_user_data(const struct session *sess)
+{
+    return sess->user_data;
+}
+
 /******************************************************************************
  * session packet
  ******************************************************************************/