SSB_MEVENT
atomic_set_int(&ssb->ssb_flags, SSB_MEVENT);
atomic_clear_int(&ssb->ssb_flags, SSB_MEVENT);
atomic_set_int(&ssb->ssb_flags, SSB_MEVENT);
if (ssb->ssb_flags & SSB_MEVENT) {
atomic_clear_int(&ssb->ssb_flags, SSB_MEVENT);
SSB_KNOTE | SSB_MEVENT)