1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
/* Timer handling
*
* (C) 2016 by Andreas Eversberg <jolly@eversberg.eu>
* 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 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include "timer.h"
static struct timer *timer_head = NULL;
static struct timer **timer_tail_p = &timer_head;
double get_time(void)
{
struct timeval tv;
gettimeofday(&tv, NULL);
return (double)tv.tv_sec + (double)tv.tv_usec / 1000000.0;
}
void timer_init(struct timer *timer, void (*fn)(struct timer *timer), void *priv)
{
if (timer->linked) {
fprintf(stderr, "Timer is already initialized, aborting!\n");
abort();
}
timer->timeout = 0;
timer->fn = fn;
timer->priv = priv;
timer->next = NULL;
*timer_tail_p = timer;
timer_tail_p = &timer->next;
timer->linked = 1;
}
void timer_exit(struct timer *timer)
{
timer_tail_p = &timer_head;
while (*timer_tail_p) {
if (timer == *timer_tail_p)
*timer_tail_p = (*timer_tail_p)->next;
else
timer_tail_p = &((*timer_tail_p)->next);
}
timer->linked = 0;
}
void timer_start(struct timer *timer, double duration)
{
struct timeval tv;
if (!timer->linked) {
fprintf(stderr, "Timer is not initialized, aborting!\n");
abort();
}
gettimeofday(&tv, NULL);
timer->duration = duration;
timer->timeout = get_time() + duration;
}
void timer_stop(struct timer *timer)
{
if (!timer->linked) {
fprintf(stderr, "Timer is not initialized, aborting!\n");
abort();
}
timer->timeout = 0;
}
int timer_running(struct timer *timer)
{
if (!timer->linked) {
fprintf(stderr, "Timer is not initialized, aborting!\n");
abort();
}
return (timer->timeout != 0);
}
void process_timer(void)
{
struct timer *timer = timer_head;
double now;
now = get_time();
again:
while (timer) {
if (timer->linked && timer->timeout > 0 && now >= timer->timeout) {
timer->timeout = 0;
timer->fn(timer);
goto again;
}
timer = timer->next;
}
}
|
