--- libelwix/inc/elwix/aring.h	2026/02/10 15:49:08	1.4.4.1
+++ libelwix/inc/elwix/aring.h	2026/02/10 17:50:00	1.5
@@ -3,7 +3,7 @@
 *  by Michael Pounov <misho@elwix.org>
 *
 * $Author: misho $
-* $Id: aring.h,v 1.4.4.1 2026/02/10 15:49:08 misho Exp $
+* $Id: aring.h,v 1.5 2026/02/10 17:50:00 misho Exp $
 *
 **************************************************************************
 The ELWIX and AITNET software is distributed under the following
@@ -58,6 +58,7 @@ typedef struct {
 typedef struct {
 	E_ATOMIC_ALIGN	unsigned int	lrb_head;
 	E_ATOMIC_ALIGN	unsigned int	lrb_tail;
+	E_ATOMIC_ALIGN	unsigned int	lrb_full;
 			int		lrb_size;
 			unsigned char	*lrb_data;
 } lrbuf_t;
@@ -65,7 +66,11 @@ typedef struct {
 					u_int _h, _t; \
 					_t = atomic_load_explicit((atomic_int*) &(x)->lrb_tail, memory_order_acquire); \
 					_h = atomic_load_explicit((atomic_int*) &(x)->lrb_head, memory_order_relaxed); \
-					(r) = (_h + (x)->lrb_size - _t) % (x)->lrb_size; \
+					if (_h == _t) \
+						(r) = atomic_load_explicit((atomic_int*) &(x)->lrb_full, memory_order_acquire) ? \
+							(x)->lrb_size : 0; \
+					else \
+						(r) = (_h + (x)->lrb_size - _t) % (x)->lrb_size; \
 				} while (0)
 #define lrb_unused(x, r)	do { \
 					u_int _r; \