X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2Fkernel%2Fao.h;h=16d600aa08b46319767ebc550e72b7efcb84fdba;hb=abdf3177293c57e659017b64819c13f11c126011;hp=48b06490aebeb8918580f78ae97fa9818110f669;hpb=f2e5ffd839fe5be99359e4c86a96f03148bac698;p=fw%2Faltos

diff --git a/src/kernel/ao.h b/src/kernel/ao.h
index 48b06490..16d600aa 100644
--- a/src/kernel/ao.h
+++ b/src/kernel/ao.h
@@ -652,6 +652,7 @@ union ao_monitor {
 extern __xdata union ao_monitor ao_monitor_ring[AO_MONITOR_RING];
 
 #define ao_monitor_ring_next(n)	(((n) + 1) & (AO_MONITOR_RING - 1))
+#define ao_monitor_ring_prev(n)	(((n) - 1) & (AO_MONITOR_RING - 1))
 
 extern __data uint8_t ao_monitoring;
 extern __data uint8_t ao_monitor_head;