120 lines
2.5 KiB
C
120 lines
2.5 KiB
C
/* Timer handling
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*
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* (C) 2016 by Andreas Eversberg <jolly@eversberg.eu>
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* All Rights Reserved
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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 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 General Public License for more details.
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*
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* You should have received a copy of the GNU 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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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/time.h>
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#include "timer.h"
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static struct timer *timer_head = NULL;
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static struct timer **timer_tail_p = &timer_head;
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double get_time(void)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return (double)tv.tv_sec + (double)tv.tv_usec / 1000000.0;
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}
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void timer_init(struct timer *timer, void (*fn)(struct timer *timer), void *priv)
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{
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if (timer->linked) {
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fprintf(stderr, "Timer is already initialized, aborting!\n");
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abort();
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}
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timer->timeout = 0;
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timer->fn = fn;
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timer->priv = priv;
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timer->next = NULL;
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*timer_tail_p = timer;
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timer_tail_p = &timer->next;
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timer->linked = 1;
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}
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void timer_exit(struct timer *timer)
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{
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timer_tail_p = &timer_head;
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while (*timer_tail_p) {
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if (timer == *timer_tail_p)
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*timer_tail_p = (*timer_tail_p)->next;
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else
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timer_tail_p = &((*timer_tail_p)->next);
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}
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timer->linked = 0;
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}
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void timer_start(struct timer *timer, double duration)
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{
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struct timeval tv;
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if (!timer->linked) {
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fprintf(stderr, "Timer is not initialized, aborting!\n");
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abort();
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}
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gettimeofday(&tv, NULL);
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timer->duration = duration;
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timer->timeout = get_time() + duration;
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}
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void timer_stop(struct timer *timer)
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{
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if (!timer->linked) {
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fprintf(stderr, "Timer is not initialized, aborting!\n");
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abort();
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}
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timer->timeout = 0;
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}
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int timer_running(struct timer *timer)
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{
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if (!timer->linked) {
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fprintf(stderr, "Timer is not initialized, aborting!\n");
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abort();
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}
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return (timer->timeout != 0);
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}
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void process_timer(void)
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{
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struct timer *timer = timer_head;
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double now;
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now = get_time();
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again:
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while (timer) {
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if (timer->linked && timer->timeout > 0 && now >= timer->timeout) {
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timer->timeout = 0;
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timer->fn(timer);
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goto again;
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}
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timer = timer->next;
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}
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}
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