--- libelwix/inc/elwix/aring.h	2026/02/16 10:05:28	1.7
+++ libelwix/inc/elwix/aring.h	2026/02/18 01:23:04	1.7.2.1
@@ -3,7 +3,7 @@
 *  by Michael Pounov <misho@elwix.org>
 *
 * $Author: misho $
-* $Id: aring.h,v 1.7 2026/02/16 10:05:28 misho Exp $
+* $Id: aring.h,v 1.7.2.1 2026/02/18 01:23:04 misho Exp $
 *
 **************************************************************************
 The ELWIX and AITNET software is distributed under the following
@@ -54,6 +54,30 @@ typedef struct {
 			int		rb_bufnum;
 			struct iovec	*rb_buffer;
 } ringbuf_t;
+#define rbuf_head(x)		atomic_load_explicit((atomic_int*) &(x)->rb_head, memory_order_relaxed)
+#define rbuf_tail(x)		atomic_load_explicit((atomic_int*) &(x)->rb_tail, memory_order_relaxed)
+#define rbuf_hptr(x)		((x)->rb_buffer + rbuf_head((x)))
+#define rbuf_tptr(x)		((x)->rb_buffer + rbuf_tail((x)))
+#define rbuf_ptr(x, n)		((x)->rb_buffer + ((rbuf_tail((x)) + (n)) % (x)->rb_bufnum))
+#define rbuf_num(x)		((x)->rb_bufnum)
+#define rbuf_getb(x)		((x)->rb_buffer)
+#define rbuf_get(x, n)		*rbuf_ptr((x), (n))
+#define rbuf_isrewind(x)	(rbuf_head((x)) < rbuf_tail((x)))
+#define rbuf_queued(x, r)	do { \
+					u_int _h, _t; \
+					_t = atomic_load_explicit((atomic_int*) &(x)->rb_tail, memory_order_acquire); \
+					_h = atomic_load_explicit((atomic_int*) &(x)->rb_head, memory_order_relaxed); \
+					if (_h == _t) \
+						(r) = 0; \
+					else \
+						(r) = (_h + (x)->rb_bufnum - _t) % (x)->rb_bufnum; \
+				} while (0)
+#define rbuf_unused(x, r)	do { \
+					u_int _r; \
+					rbuf_queued((x), _r); \
+					(r) = (x)->rb_bufnum - _r; \
+				} while (0)
+
 
 typedef struct {
 	E_ATOMIC_ALIGN	unsigned int	lrb_head;