TDB_SUSPEND
tdt->td_dbgflags &= ~(TDB_SUSPEND | TDB_XSIG |
if (td->td_dbgflags & TDB_SUSPEND) {
(td->td_dbgflags & TDB_SUSPEND) != 0));
((p->p_flag & P_TRACED) && (td->td_dbgflags & TDB_SUSPEND)))
td2->td_dbgflags |= TDB_SUSPEND;
td2->td_dbgflags &= ~TDB_SUSPEND;
TDB_SUSPEND | TDB_BORN);