RING_POK
#define RING_POK(ap, n) ((int)RING_CNT(ap) < (int)(RINGSIZE-(n)))
#define RING_POK(zap, n) ((int)RING_CNT(zap) < (int)(RINGSIZE-(n)))
#define RING_POK(ap, n) ((int)RING_CNT(ap) < (int)(RINGSIZE-(n)))
#define RING_POK(qsp, n) ((int)RING_CNT(qsp) < (int)(RINGSIZE-(n)))