TS_TBLOCK
CLR(tp->t_state, TS_TBLOCK);
!ISSET(tp->t_state, TS_TBLOCK) &&
SET(tp->t_state, TS_TBLOCK);
SET(tp->t_state, TS_TBLOCK);
if (ISSET(tp->t_state, TS_TBLOCK)) {
CLR(tp->t_state, TS_TBLOCK);
CLR(tp->t_state, TS_TBLOCK);
{ TS_TBLOCK, 'K'},