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nanokernel: add interface for obtaining earliest timer deadline

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This interface can be called by the microkernel to obtain the earliest
expiring nanokernel between the timers and timeouts, to allow the idle
code to take the correct decision w.r.t. tickless idle.

Change-Id: I9598ec2a0dd013a6a8ccc95d50105bb98ca27f54
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
This commit is contained in:
Benjamin Walsh 2015-06-14 17:54:29 -04:00 • committed by Anas Nashif
commit 101fee8dde
1 changed files with 23 additions and 0 deletions
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23
kernel/nanokernel/nano_sys_clock.c
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@ -249,4 +249,27 @@ void _nano_sys_clock_tick_announce(uint32_t ticks)
}
#endif
/* get closest nano timers deadline expiry, (uint32_t)TICKS_UNLIMITED if none */
#ifdef CONFIG_NANO_TIMERS
static inline uint32_t _nano_get_earliest_timers_deadline(void)
{
return _nano_timer_list ? _nano_timer_list->ticks : TICKS_UNLIMITED;
}
#else
static inline uint32_t _nano_get_earliest_timers_deadline(void)
{
return TICKS_UNLIMITED;
}
#endif
/*
* Get closest nano timeouts/timers deadline expiry, (uint32_t)TICKS_UNLIMITED
* if none.
*/
uint32_t _nano_get_earliest_deadline(void)
{
return min(_nano_get_earliest_timeouts_deadline(),
_nano_get_earliest_timers_deadline());
}
#endif /* CONFIG_NANOKERNEL */