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/* gsmd timer code
*
* (C) 2000-2005 by Harald Welte <laforge@gnumonks.org>
* (C) 2007 by OpenMoko, Inc.
* Written by Harald Welte <laforge@openmoko.org>
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <time.h>
#include <common/linux_list.h>
#include "gsmd.h"
#include <gsmd/gsmd.h>
#include <gsmd/talloc.h>
static LLIST_HEAD(gsmd_timers);
static void *__tmr_ctx;
#if 0
static void tv_normalize(struct timeval *out)
{
out->tv_sec += (out->tv_usec / 1000000);
out->tv_usec = (out->tv_usec % 1000000);
}
#endif
/* subtract two struct timevals */
static int tv_sub(struct timeval *res, const struct timeval *from,
const struct timeval *sub)
{
res->tv_sec = from->tv_sec - sub->tv_sec;
res->tv_usec = from->tv_usec - sub->tv_usec;
while (res->tv_usec < 0) {
res->tv_sec -= 1;
res->tv_usec += 1000000;
}
return 0;
}
#if 0
static int tv_add(struct timeval *res, const struct timeval *a1,
const struct timeval *a2)
{
unsigned int carry;
res->tv_sec = a1->tv_sec + a2->tv_sec;
res->tv_usec = a1->tv_usec + a2->tv_usec;
tv_normalize(res);
}
#endif
static int tv_later(const struct timeval *expires, const struct timeval *now)
{
if (expires->tv_sec < now->tv_sec)
return 0;
else if (expires->tv_sec > now->tv_sec)
return 1;
else /* if (expires->tv_sec == now->tv_sec */ {
if (expires->tv_usec >= now->tv_usec)
return 1;
}
return 0;
}
static int tv_smaller(const struct timeval *t1, const struct timeval *t2)
{
return tv_later(t2, t1);
}
static int calc_next_expiration(void)
{
struct gsmd_timer *cur;
struct timeval min, now, diff;
struct itimerval iti;
int ret;
gettimeofday(&now, NULL);
retry:
if (llist_empty(&gsmd_timers))
return 0;
llist_for_each_entry(cur, &gsmd_timers, list) {
if (gsmd_timers.next == &cur->list)
min = cur->expires;
if (tv_smaller(&cur->expires, &min))
min = cur->expires;
}
if (tv_sub(&diff, &min, &now) < 0) {
/* FIXME: run expired timer callbacks */
/* we cannot run timers from here since we might be
* called from register_timer() within check_n_run() */
/* FIXME: restart with next minimum timer */
goto retry;
}
/* re-set kernel timer */
memset(&iti, 0, sizeof(iti));
memcpy(&iti.it_value, &diff, sizeof(iti.it_value));
ret = setitimer(ITIMER_REAL, &iti, NULL);
if (ret < 0)
return ret;
return 0;
}
void gsmd_timer_check_n_run(void)
{
struct gsmd_timer *cur, *cur2;
struct timeval now;
if (gettimeofday(&now, NULL) < 0)
return;
llist_for_each_entry_safe(cur, cur2, &gsmd_timers, list) {
if (tv_later(&now, &cur->expires)) {
/* fist delete it from the list of timers */
llist_del(&cur->list);
/* then call. called function can re-add it */
(cur->cb)(cur, cur->data);
}
}
calc_next_expiration();
}
int gsmd_timer_init(void)
{
__tmr_ctx = talloc_named_const(gsmd_tallocs, 1, "timers");
return 0;
}
struct gsmd_timer *gsmd_timer_alloc(void)
{
struct gsmd_timer *tmr;
tmr = talloc_zero_size(__tmr_ctx, sizeof(*tmr));
return tmr;
}
int gsmd_timer_register(struct gsmd_timer *timer)
{
int ret;
struct timeval tv;
ret = gettimeofday(&tv, NULL);
if (ret < 0)
return ret;
/* convert expiration time into absoulte time */
timer->expires.tv_sec += tv.tv_sec;
timer->expires.tv_usec += tv.tv_usec;
llist_add_tail(&timer->list, &gsmd_timers);
/* re-calculate next expiration */
calc_next_expiration();
return 0;
}
struct gsmd_timer *gsmd_timer_create(struct timeval *expires,
void (*cb)(struct gsmd_timer *tmr,
void *data),
void *data)
{
struct gsmd_timer *tmr = gsmd_timer_alloc();
int rc;
if (!tmr)
return NULL;
memcpy(&tmr->expires, expires, sizeof(tmr->expires));
tmr->cb = cb;
tmr->data = data;
rc = gsmd_timer_register(tmr);
if (rc < 0) {
talloc_free(tmr);
return NULL;
}
return tmr;
}
void gsmd_timer_unregister(struct gsmd_timer *timer)
{
llist_del(&timer->list);
/* re-calculate next expiration */
calc_next_expiration();
}
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