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sched: Support adding timers to the start of timer_list

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If sched_add_timer() is called on a timer that would make it the new
head of the list, then add it and signal the board code that the timer
should be rescheduled.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2017-07-27 12:19:09 -04:00
parent 62f77f6bc5
commit 6a63c27542
7 changed files with 62 additions and 45 deletions
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23
src/sched.c
View file

@ -20,7 +20,7 @@
****************************************************************/
static struct timer periodic_timer, *timer_list = &periodic_timer;
static struct timer sentinel_timer;
static struct timer sentinel_timer, deleted_timer;
// The periodic_timer simplifies the timer code by ensuring there is
// always a timer on the timer list and that there is always a timer
@ -79,10 +79,22 @@ sched_add_timer(struct timer *add)
{
uint32_t waketime = add->waketime;
irqstatus_t flag = irq_save();
if (timer_is_before(waketime, timer_list->waketime))
// Timer in past (or very near future)
shutdown("Timer too close");
insert_timer(add, waketime);
if (unlikely(timer_is_before(waketime, timer_list->waketime))) {
// This timer is before all other scheduled timers
struct timer *tl = timer_list;
if (timer_is_before(waketime, timer_read_time() + timer_from_us(2000)))
try_shutdown("Timer too close");
if (tl == &deleted_timer)
add->next = deleted_timer.next;
else
add->next = tl;
deleted_timer.waketime = waketime;
deleted_timer.next = add;
timer_list = &deleted_timer;
timer_kick();
} else {
insert_timer(add, waketime);
}
irq_restore(flag);
}
@ -158,6 +170,7 @@ sched_timer_shutdown(void)
deleted_timer.waketime = periodic_timer.waketime;
deleted_timer.next = &periodic_timer;
periodic_timer.next = &sentinel_timer;
timer_kick();
}
DECL_SHUTDOWN(sched_timer_shutdown);