TS_TTSTOP
tp->t_state & TS_TTSTOP &&
~(TS_TTSTOP|TS_OFBLOCK);
if (tp->t_state & TS_TTSTOP) {
~(TS_TTSTOP |
TS_TTSTOP;
if (tp->t_state & TS_TTSTOP) {
tp->t_state &= ~(TS_TTSTOP|TS_OFBLOCK);
if (tp->t_state & TS_TTSTOP) {
if (tp->t_state & TS_TTSTOP) {
tp->t_state &= ~(TS_TTSTOP|TS_OFBLOCK);
if (!(tp->t_state & TS_TTSTOP)) {
tp->t_state |= (TS_TTSTOP|TS_OFBLOCK);
if (tp->t_state & TS_TTSTOP) {
tp->t_state &= ~(TS_TTSTOP|TS_OFBLOCK);