SC_CANCEL_FLG
scp->sc_flgs &= ~(SC_CANCEL_FLG | SC_EINTR_FLG);
scp->sc_flgs |= SC_CANCEL_FLG;
scp->sc_flgs &= ~SC_CANCEL_FLG;
scp->sc_flgs &= ~SC_CANCEL_FLG;
scp->sc_flgs &= ~(SC_PARK_FLG | SC_CANCEL_FLG);
scp->sc_flgs |= SC_CANCEL_FLG;
(scp->sc_flgs & (SC_CANCEL_FLG | SC_EINTR_FLG)) ==
(SC_CANCEL_FLG | SC_EINTR_FLG));
(tdp->sc_flgs & SC_CANCEL_FLG) &&