get_and_lock
ip = get_and_lock(global, class_index, 0);
ip = get_and_lock(global, class_index, 0);
ip = get_and_lock(global, class_index, 1);
ip = get_and_lock(global, class_index, 1);
ip = get_and_lock(global, class_index, 1);
ip = get_and_lock(global, class_index, 1);