void
JvmtiEventController::change_field_watch(jvmtiEvent event_type, bool added) {

  {- -------------------------------------------
  (1) JvmtiEventControllerPrivate::change_field_watch() を呼び出すだけ.
      (なお, JvmtiThreadState_lock で排他した状態で呼び出す)
      ---------------------------------------- -}

      MutexLocker mu(JvmtiThreadState_lock);
      JvmtiEventControllerPrivate::change_field_watch(event_type, added);
    }