TB_RUNNING
if (state == TB_RUNNING) {
mtb->mtb_state = TB_RUNNING;
if (state == TB_RUNNING) {
if (mtb->mtb_state == TB_RUNNING) {
mtb->mtb_state = TB_RUNNING;
if (state == TB_RUNNING) {
if (state != TB_RUNNING) {
mtb->mtb_state = TB_RUNNING;