TS_SO_OLOWAT
if (ISSET(tp->t_state, TS_SO_OLOWAT)) {
CLR(tp->t_state, TS_SO_OLOWAT);
SET(tp->t_state, TS_SO_OLOWAT);
SET(tp->t_state, TS_SO_OLOWAT);
if (ISSET(tp->t_state, TS_SO_OLOWAT) &&
CLR(tp->t_state, TS_SO_OLOWAT);
#ifdef TS_SO_OLOWAT
{ TS_SO_OLOWAT, 'A'},