PERUNNING
if (chp->ch_state == PERUNNING) {
chp->ch_state = PERUNNING;
chp->ch_state = PERUNNING;
if (chp->ch_state != PERUNNING) {
if (chp->ch_state != PERUNNING) {
chp->ch_state = PERUNNING;
if ((chp->ch_state == PERUNNING) &&