altos: Provide ao_task_alarm_tick to reduce per-tick cost
authorKeith Packard <keithp@keithp.com>
Thu, 25 Oct 2012 20:42:10 +0000 (13:42 -0700)
committerKeith Packard <keithp@keithp.com>
Fri, 26 Oct 2012 21:07:04 +0000 (14:07 -0700)
Cache the next wakeup time and check that before jumping to the task
code.

Signed-off-by: Keith Packard <keithp@keithp.com>

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