N4S_CB_PINGED
{"N4S_CB_PINGED", N4S_CB_PINGED, N4S_CB_PINGED},
sp->s_flags |= N4S_CB_PINGED;
if ((sp->s_flags & (N4S_CB_PINGED | N4S_CB_WAITER)) == 0) {
np->s_flags &= ~(N4S_CB_PINGED | N4S_CB_WAITER);