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/* (C) 2018 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
*
* All Rights Reserved
*
* Author: Neels Hofmeyr <nhofmeyr@sysmocom.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <talloc.h>
#include <time.h>
#include <stdint.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/bsc/penalty_timers.h>
#include <osmocom/bsc/gsm_data.h>
struct penalty_timers {
struct llist_head timers;
};
struct penalty_timer {
struct llist_head entry;
const void *for_object;
unsigned int timeout;
};
static unsigned int time_now(void)
{
time_t now;
time(&now);
/* FIXME: use monotonic clock */
return (unsigned int)now;
}
struct penalty_timers *penalty_timers_init(void *ctx)
{
struct penalty_timers *pt = talloc_zero(ctx, struct penalty_timers);
if (!pt)
return NULL;
INIT_LLIST_HEAD(&pt->timers);
return pt;
}
void penalty_timers_add(struct penalty_timers *pt, const void *for_object, int timeout)
{
struct penalty_timer *timer;
unsigned int now;
unsigned int then;
now = time_now();
if (timeout <= 0)
return;
then = now + timeout;
/* timer already running for that BTS? */
llist_for_each_entry(timer, &pt->timers, entry) {
if (timer->for_object != for_object)
continue;
/* raise, if running timer will timeout earlier or has timed
* out already, otherwise keep later timeout */
if (timer->timeout < then)
timer->timeout = then;
return;
}
/* add new timer */
timer = talloc_zero(pt, struct penalty_timer);
if (!timer)
return;
timer->for_object = for_object;
timer->timeout = then;
llist_add_tail(&timer->entry, &pt->timers);
}
unsigned int penalty_timers_remaining(struct penalty_timers *pt, const void *for_object)
{
struct penalty_timer *timer;
unsigned int now = time_now();
unsigned int max_remaining = 0;
llist_for_each_entry(timer, &pt->timers, entry) {
unsigned int remaining;
if (timer->for_object != for_object)
continue;
if (now >= timer->timeout)
continue;
remaining = timer->timeout - now;
if (remaining > max_remaining)
max_remaining = remaining;
}
return max_remaining;
}
void penalty_timers_clear(struct penalty_timers *pt, const void *for_object)
{
struct penalty_timer *timer, *timer2;
llist_for_each_entry_safe(timer, timer2, &pt->timers, entry) {
if (for_object && timer->for_object != for_object)
continue;
llist_del(&timer->entry);
talloc_free(timer);
}
}
void penalty_timers_free(struct penalty_timers **pt_p)
{
struct penalty_timers *pt = *pt_p;
if (!pt)
return;
penalty_timers_clear(pt, NULL);
talloc_free(pt);
*pt_p = NULL;
}
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