From e57ab2a7bfb69c0ef9b5b7fa8e53e20a500e7c6c Mon Sep 17 00:00:00 2001
From: Keith Packard <keithp@keithp.com>
Date: Thu, 25 Oct 2012 13:42:10 -0700
Subject: altos: Provide ao_task_alarm_tick to reduce per-tick cost

Cache the next wakeup time and check that before jumping to the task
code.

Signed-off-by: Keith Packard <keithp@keithp.com>
---
 src/core/ao_task.h | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/core/ao_task.h')

diff --git a/src/core/ao_task.h b/src/core/ao_task.h
index b3f152a0..049f69a7 100644
--- a/src/core/ao_task.h
+++ b/src/core/ao_task.h
@@ -82,6 +82,7 @@ ao_add_task(__xdata struct ao_task * task, void (*start)(void), __code char *nam
 
 #if HAS_TASK_QUEUE
 /* Called on timer interrupt to check alarms */
+extern uint16_t	ao_task_alarm_tick;
 void
 ao_task_check_alarm(uint16_t tick);
 #endif
-- 
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