143 lines
3.7 KiB
C
143 lines
3.7 KiB
C
/*
|
|
* Copyright (c) 2008 Travis Geiselbrecht
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
|
* a copy of this software and associated documentation files
|
|
* (the "Software"), to deal in the Software without restriction,
|
|
* including without limitation the rights to use, copy, modify, merge,
|
|
* publish, distribute, sublicense, and/or sell copies of the Software,
|
|
* and to permit persons to whom the Software is furnished to do so,
|
|
* subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
|
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
|
|
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
|
|
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
|
|
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
#include <debug.h>
|
|
#include <list.h>
|
|
#include <kernel/thread.h>
|
|
#include <kernel/timer.h>
|
|
#include <platform/timer.h>
|
|
#include <platform.h>
|
|
|
|
static struct list_node timer_queue;
|
|
|
|
void timer_initialize(timer_t *timer)
|
|
{
|
|
timer->magic = TIMER_MAGIC;
|
|
list_clear_node(&timer->node);
|
|
timer->scheduled_time = 0;
|
|
timer->periodic_time = 0;
|
|
timer->callback = 0;
|
|
timer->arg = 0;
|
|
}
|
|
|
|
static void insert_timer_in_queue(timer_t *timer)
|
|
{
|
|
timer_t *entry;
|
|
|
|
list_for_every_entry(&timer_queue, entry, timer_t, node) {
|
|
if (entry->scheduled_time > timer->scheduled_time) {
|
|
list_add_before(&entry->node, &timer->node);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* walked off the end of the list */
|
|
list_add_tail(&timer_queue, &timer->node);
|
|
}
|
|
|
|
void timer_set_oneshot(timer_t *timer, time_t delay, timer_callback callback, void *arg)
|
|
{
|
|
time_t now;
|
|
|
|
// TRACEF("delay %d, callback %p, arg %p\n", delay, callback, arg);
|
|
|
|
DEBUG_ASSERT(timer->magic == TIMER_MAGIC);
|
|
|
|
if (list_in_list(&timer->node)) {
|
|
panic("timer %p already in list\n", timer);
|
|
}
|
|
|
|
now = current_time();
|
|
timer->scheduled_time = now + delay;
|
|
timer->periodic_time = 0;
|
|
timer->callback = callback;
|
|
timer->arg = arg;
|
|
|
|
// TRACEF("scheduled time %u\n", timer->scheduled_time);
|
|
|
|
enter_critical_section();
|
|
|
|
insert_timer_in_queue(timer);
|
|
|
|
exit_critical_section();
|
|
}
|
|
|
|
void timer_cancel(timer_t *timer)
|
|
{
|
|
DEBUG_ASSERT(timer->magic == TIMER_MAGIC);
|
|
|
|
enter_critical_section();
|
|
|
|
if (list_in_list(&timer->node))
|
|
list_delete(&timer->node);
|
|
|
|
exit_critical_section();
|
|
}
|
|
|
|
/* called at interrupt time to process any pending timers */
|
|
static enum handler_return timer_tick(void *arg, time_t now)
|
|
{
|
|
timer_t *timer;
|
|
enum handler_return ret = INT_NO_RESCHEDULE;
|
|
|
|
#if THREAD_STATS
|
|
thread_stats.timer_ints++;
|
|
#endif
|
|
|
|
for (;;) {
|
|
/* see if there's an event to process */
|
|
timer = list_peek_head_type(&timer_queue, timer_t, node);
|
|
if (likely(!timer || now < timer->scheduled_time))
|
|
break;
|
|
|
|
/* process it */
|
|
DEBUG_ASSERT(timer->magic == TIMER_MAGIC);
|
|
list_delete(&timer->node);
|
|
// timer = list_remove_head_type(&timer_queue, timer_t, node);
|
|
// ASSERT(timer);
|
|
|
|
#if THREAD_STATS
|
|
thread_stats.timers++;
|
|
#endif
|
|
|
|
// TRACEF("firing callback %p, arg %p\n", timer->callback, timer->arg);
|
|
if (timer->callback(timer, now, timer->arg) == INT_RESCHEDULE)
|
|
ret = INT_RESCHEDULE;
|
|
}
|
|
|
|
/* let the scheduler have a shot to do quantum expiration, etc */
|
|
if (thread_timer_tick() == INT_RESCHEDULE)
|
|
ret = INT_RESCHEDULE;
|
|
|
|
return INT_RESCHEDULE;
|
|
}
|
|
|
|
void timer_init(void)
|
|
{
|
|
list_initialize(&timer_queue);
|
|
|
|
/* register for a periodic timer tick */
|
|
platform_set_periodic_timer(timer_tick, NULL, 10); /* 10ms */
|
|
}
|
|
|
|
|