+ event.itf->unref(event.closure);
+}
+
+/*
+ * remove one reference to the data associated to the 'event'
+ * After calling this function, the event
+ * MUST NOT BE USED ANYMORE.
+ */
+static inline void afb_event_addref(struct afb_event event)
+{
+ event.itf->addref(event.closure);