summaryrefslogtreecommitdiff
path: root/task-utils.c
blob: a4017ff201b4c274018684c663f70ff1c89d4b75 (plain)
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
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * 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., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include <pthread.h>
#include <sys/timerfd.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "task-utils.h"

struct task_info *task_init(void *(*threadfn)(void *), int (*postfn)(void *),
			    void *thread_private)
{
	struct task_info *info = calloc(1, sizeof(struct task_info));

	if (!info)
		return NULL;

	info->private_data = thread_private;
	info->threadfn = threadfn;
	info->postfn = postfn;

	return info;
}

int task_start(struct task_info *info)
{
	int ret;

	if (!info)
		return -1;

	if (!info->threadfn)
		return -1;

	ret = pthread_create(&info->id, NULL, info->threadfn,
			     info->private_data);

	if (ret)
		info->id = 0;

	return ret;
}

void task_stop(struct task_info *info)
{
	if (!info)
		return;

	if (info->id > 0) {
		pthread_cancel(info->id);
		pthread_join(info->id, NULL);
		info->id = 0;
	}

	if (info->periodic.timer_fd) {
		close(info->periodic.timer_fd);
		info->periodic.timer_fd = 0;
	}

	if (info->postfn)
		info->postfn(info->private_data);
}

void task_deinit(struct task_info *info)
{
	if (!info)
		return;

	free(info);
}

int task_period_start(struct task_info *info, unsigned int period_ms)
{
	unsigned int ns;
	unsigned int sec;
	struct itimerspec itval;

	if (!info)
		return -1;

	info->periodic.timer_fd = timerfd_create(CLOCK_MONOTONIC, 0);
	if (info->periodic.timer_fd == -1) {
		info->periodic.timer_fd = 0;
		return info->periodic.timer_fd;
	}

	info->periodic.wakeups_missed = 0;

	sec = period_ms / 1000;
	ns = (period_ms - (sec * 1000)) * 1000;
	itval.it_interval.tv_sec = sec;
	itval.it_interval.tv_nsec = ns;
	itval.it_value.tv_sec = sec;
	itval.it_value.tv_nsec = ns;

	return timerfd_settime(info->periodic.timer_fd, 0, &itval, NULL);
};

void task_period_wait(struct task_info *info)
{
	unsigned long long missed;
	int ret;

	if (!info)
		return;

	ret = read(info->periodic.timer_fd, &missed, sizeof (missed));
	if (ret == -1)
		return;

	if (missed > 0)
		info->periodic.wakeups_missed += (missed - 1);
}

void task_period_stop(struct task_info *info)
{
	if (!info)
		return;

	if (info->periodic.timer_fd) {
		timerfd_settime(info->periodic.timer_fd, 0, NULL, NULL);
		close(info->periodic.timer_fd);
		info->periodic.timer_fd = -1;
	}
}