CPT_FLAG_DEVICE_READY
#define cpt_device_ready(cpt) ((cpt)->flags & CPT_FLAG_DEVICE_READY)
cpt->flags &= ~CPT_FLAG_DEVICE_READY;
cpt->flags |= CPT_FLAG_DEVICE_READY;
cpt->flags |= CPT_FLAG_DEVICE_READY;
cptvf->flags |= CPT_FLAG_DEVICE_READY;