TDB_BORN
newtd->td_dbgflags |= TDB_BORN;
(td->td_dbgflags & TDB_BORN) != 0)
td->td_dbgflags &= ~(TDB_SCX | TDB_BORN);
newtd->td_dbgflags |= TDB_BORN;
TDB_SUSPEND | TDB_BORN);
if (td2->td_dbgflags & TDB_BORN)