130 lines
3.1 KiB
C
130 lines
3.1 KiB
C
/* (C) 2018 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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*
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* All Rights Reserved
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*
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* Author: Neels Hofmeyr <nhofmeyr@sysmocom.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <talloc.h>
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#include <time.h>
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#include <stdint.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/bsc/penalty_timers.h>
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#include <osmocom/bsc/gsm_data.h>
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struct penalty_timers {
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struct llist_head timers;
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};
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struct penalty_timer {
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struct llist_head entry;
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void *for_object;
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unsigned int timeout;
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};
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static unsigned int time_now(void)
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{
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time_t now;
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time(&now);
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/* FIXME: use monotonic clock */
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return (unsigned int)now;
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}
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struct penalty_timers *penalty_timers_init(void *ctx)
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{
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struct penalty_timers *pt = talloc_zero(ctx, struct penalty_timers);
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if (!pt)
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return NULL;
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INIT_LLIST_HEAD(&pt->timers);
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return pt;
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}
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void penalty_timers_add(struct penalty_timers *pt, void *for_object, int timeout)
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{
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struct penalty_timer *timer;
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unsigned int now;
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unsigned int then;
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now = time_now();
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if (timeout <= 0)
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return;
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then = now + timeout;
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/* timer already running for that BTS? */
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llist_for_each_entry(timer, &pt->timers, entry) {
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if (timer->for_object != for_object)
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continue;
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/* raise, if running timer will timeout earlier or has timed
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* out already, otherwise keep later timeout */
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if (timer->timeout < then)
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timer->timeout = then;
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return;
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}
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/* add new timer */
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timer = talloc_zero(pt, struct penalty_timer);
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if (!timer)
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return;
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timer->for_object = for_object;
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timer->timeout = then;
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llist_add_tail(&timer->entry, &pt->timers);
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}
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unsigned int penalty_timers_remaining(struct penalty_timers *pt, void *for_object)
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{
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struct penalty_timer *timer;
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unsigned int now = time_now();
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unsigned int max_remaining = 0;
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llist_for_each_entry(timer, &pt->timers, entry) {
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unsigned int remaining;
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if (timer->for_object != for_object)
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continue;
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if (now >= timer->timeout)
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continue;
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remaining = timer->timeout - now;
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if (remaining > max_remaining)
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max_remaining = remaining;
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}
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return max_remaining;
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}
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void penalty_timers_clear(struct penalty_timers *pt, void *for_object)
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{
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struct penalty_timer *timer, *timer2;
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llist_for_each_entry_safe(timer, timer2, &pt->timers, entry) {
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if (for_object && timer->for_object != for_object)
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continue;
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llist_del(&timer->entry);
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talloc_free(timer);
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}
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}
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void penalty_timers_free(struct penalty_timers **pt_p)
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{
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struct penalty_timers *pt = *pt_p;
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if (!pt)
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return;
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penalty_timers_clear(pt, NULL);
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talloc_free(pt);
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*pt_p = NULL;
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}
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