Merge branch 'master' of ssh://git.gag.com/scm/git/fw/altos

[fw/altos] / src / kernel / ao.h

diff --git a/src/kernel/ao.h b/src/kernel/ao.h
index 48b06490aebeb8918580f78ae97fa9818110f669..16d600aa08b46319767ebc550e72b7efcb84fdba 100644 (file)
--- 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;