NSSLIST_UNLOCK_IF(iter->list);
nssListIterator_Start(nssListIterator *iter){    NSSLIST_LOCK_IF(iter->list);    if (iter->list->count == 0) {	NSSLIST_UNLOCK_IF(iter->list);	return NULL;    }    iter->current = iter->list->head;    return iter->current->data;}