TDP_SIGFASTPENDING
td->td_pflags |= TDP_SIGFASTPENDING;
resched = (td->td_pflags & TDP_SIGFASTPENDING) != 0 ||
td->td_pflags &= ~(TDP_SIGFASTBLOCK | TDP_SIGFASTPENDING);
if ((td->td_pflags & TDP_SIGFASTPENDING) == 0)
td->td_pflags &= ~TDP_SIGFASTPENDING;