1
0
mirror of https://github.com/rkd77/elinks.git synced 2024-11-04 08:17:17 -05:00
elinks/src/main/timer.c
Witold Filipczyk 21d36fcbd1 Add --with-libev, because libev is smaller.
When both --with-libev and --with-libevent are used, libev takes
precedence.
2017-11-17 16:34:03 +01:00

236 lines
4.9 KiB
C

/* Timers. */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <errno.h>
#if defined(HAVE_LIBEV) && !defined(OPENVMS) && !defined(DOS)
#ifdef HAVE_LIBEV_EVENT_H
#include <libev/event.h>
#elif defined(HAVE_EVENT_H)
#include <event.h>
#endif
#define USE_LIBEVENT
#endif
#if (defined(HAVE_EVENT_H) || defined(HAVE_EV_EVENT_H) || defined(HAVE_LIBEV_EVENT_H)) && defined(HAVE_LIBEVENT) && !defined(OPENVMS) && !defined(DOS)
#if defined(HAVE_EVENT_H)
#include <event.h>
#elif defined(HAVE_EV_EVENT_H)
#include <ev-event.h>
#endif
#define USE_LIBEVENT
#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);
}
#ifdef HAVE_EVENT_BASE_SET
extern struct event_base *event_base;
#endif
#ifdef USE_LIBEVENT
extern int event_enabled;
#ifndef HAVE_EVENT_GET_STRUCT_EVENT_SIZE
#define sizeof_struct_event sizeof(struct event)
#else
#define sizeof_struct_event (event_get_struct_event_size())
#endif
static void
timer_callback(int h, short ev, void *data)
{
struct timer *tm = data;
tm->func(tm->data);
kill_timer(&tm);
check_bottom_halves();
}
static inline
struct event *timer_event(struct timer *tm)
{
return (struct event *)((unsigned char *)tm - sizeof_struct_event);
}
#endif
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);
#ifdef USE_LIBEVENT
mem_free(timer_event(timer));
#else
mem_free(timer);
#endif
check_bottom_halves();
}
timeval_copy(last_time, &now);
}
static void
set_event_for_timer(timer_id_T tm)
{
#ifdef USE_LIBEVENT
struct timeval tv;
struct event *ev = timer_event(tm);
timeout_set(ev, timer_callback, tm);
#ifdef HAVE_EVENT_BASE_SET
if (event_base_set(event_base, ev) == -1)
elinks_internal("ERROR: event_base_set failed: %s", strerror(errno));
#endif
tv.tv_sec = tm->interval.sec;
tv.tv_usec = tm->interval.usec;
#if defined(HAVE_LIBEV)
if (!tm->interval.usec && ev_version_major() < 4) {
/* libev bug */
tv.tv_usec = 1;
}
#endif
if (timeout_add(ev, &tv) == -1)
elinks_internal("ERROR: timeout_add failed: %s", strerror(errno));
#endif
}
/* 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);
#ifdef USE_LIBEVENT
unsigned char *q = mem_alloc(sizeof_struct_event + sizeof(struct timer));
new_timer = (struct timer *)(q + sizeof_struct_event);
#else
new_timer = mem_alloc(sizeof(*new_timer));
#endif
*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;
#ifdef USE_LIBEVENT
if (event_enabled) {
set_event_for_timer(new_timer);
add_to_list(timers, new_timer);
} else
#endif
{
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);
#ifdef USE_LIBEVENT
if (event_enabled) {
timeout_del(timer_event(timer));
}
mem_free(timer_event(timer));
#else
mem_free(timer);
#endif
*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;
}
void
set_events_for_timer(void)
{
#ifdef USE_LIBEVENT
timer_id_T tm;
foreach(tm, timers)
set_event_for_timer(tm);
#endif
}