wait_all_alert
ret = wait_all_alert(fd, 2, objs, 123, event, &index);
ret = wait_all_alert(fd, 2, objs, 123, event, &index);
ret = wait_all_alert(fd, 2, objs, 123, event, &index);
ret = wait_all_alert(fd, 2, objs, 123, event, &index);
ret = wait_all_alert(fd, 2, objs, 123, event, &index);