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elinks/src/main/timer.c
2007-07-26 22:47:23 +03:00

127 lines
2.7 KiB
C

/* Timers. */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "elinks.h"
#include "main/select.h"
#include "main/timer.h"
#include "util/error.h"
#include "util/lists.h"
#include "util/memory.h"
#include "util/time.h"
struct timer {
LIST_HEAD(struct timer);
timeval_T interval;
void (*func)(void *);
void *data;
};
/* @timers.next points to the timer with the smallest interval,
* @timers.next->next to the second smallest, and so on. */
static INIT_LIST_OF(struct timer, timers);
int
get_timers_count(void)
{
return list_size(&timers);
}
void
check_timers(timeval_T *last_time)
{
timeval_T now;
timeval_T interval;
struct timer *timer;
timeval_now(&now);
timeval_sub(&interval, last_time, &now);
foreach (timer, timers) {
timeval_sub_interval(&timer->interval, &interval);
}
while (!list_empty(timers)) {
timer = timers.next;
if (timeval_is_positive(&timer->interval))
break;
del_from_list(timer);
/* At this point, *@timer is to be considered invalid
* outside timers.c; if anything e.g. passes it to
* @kill_timer, that's a bug. However, @timer->func
* and @check_bottom_halves can still call @kill_timer
* on other timers, so this loop must be careful not to
* keep pointers to them. (bug 868) */
timer->func(timer->data);
mem_free(timer);
check_bottom_halves();
}
timeval_copy(last_time, &now);
}
/* Install a timer that calls @func(@data) after @delay milliseconds.
* Store to *@id either the ID of the new timer, or TIMER_ID_UNDEF if
* the timer cannot be installed. (This function ignores the previous
* value of *@id in any case.)
*
* When @func is called, the timer ID has become invalid. @func
* should erase the expired timer ID from all variables, so that
* there's no chance it will be given to @kill_timer later. */
void
install_timer(timer_id_T *id, milliseconds_T delay, void (*func)(void *), void *data)
{
struct timer *new_timer, *timer;
assert(id && delay > 0);
new_timer = mem_alloc(sizeof(*new_timer));
*id = (timer_id_T) new_timer; /* TIMER_ID_UNDEF is NULL */
if (!new_timer) return;
timeval_from_milliseconds(&new_timer->interval, delay);
new_timer->func = func;
new_timer->data = data;
foreach (timer, timers) {
if (timeval_cmp(&timer->interval, &new_timer->interval) >= 0)
break;
}
add_at_pos(timer->prev, new_timer);
}
void
kill_timer(timer_id_T *id)
{
struct timer *timer;
assert(id != NULL);
if (*id == TIMER_ID_UNDEF) return;
timer = *id;
del_from_list(timer);
mem_free(timer);
*id = TIMER_ID_UNDEF;
}
int
get_next_timer_time(timeval_T *t)
{
if (!list_empty(timers)) {
timeval_copy(t, &((struct timer *) &timers)->next->interval);
return 1;
}
return 0;
}