-
Notifications
You must be signed in to change notification settings - Fork 17
/
atomic.c
83 lines (73 loc) · 2.46 KB
/
atomic.c
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
/**
* ratched - TLS connection router that performs a man-in-the-middle attack
* Copyright (C) 2017-2017 Johannes Bauer
*
* This file is part of ratched.
*
* ratched 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; this program is ONLY licensed under
* version 3 of the License, later versions are explicitly excluded.
*
* ratched 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 ratched; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Johannes Bauer <JohannesBauer@gmx.de>
**/
#include <string.h>
#include <pthread.h>
#include "atomic.h"
#include "errstack.h"
void atomic_init(struct atomic_t *atomic) {
memset(atomic, 0, sizeof(*atomic));
pthread_mutex_init(&atomic->mutex, NULL);
pthread_cond_init(&atomic->cond, NULL);
}
void atomic_add(struct atomic_t *atomic, int value) {
pthread_mutex_lock(&atomic->mutex);
atomic->value += value;
pthread_cond_broadcast(&atomic->cond);
pthread_mutex_unlock(&atomic->mutex);
}
void atomic_set(struct atomic_t *atomic, int value) {
pthread_mutex_lock(&atomic->mutex);
atomic->value = value;
pthread_cond_broadcast(&atomic->cond);
pthread_mutex_unlock(&atomic->mutex);
}
#include <stdio.h>
bool atomic_test_and_set(struct atomic_t *atomic) {
bool result = false;
pthread_mutex_lock(&atomic->mutex);
if (atomic->value == 0) {
result = true;
atomic->value = 1;
}
pthread_mutex_unlock(&atomic->mutex);
return result;
}
void atomic_inc(struct atomic_t *atomic) {
return atomic_add(atomic, 1);
}
void atomic_dec(struct atomic_t *atomic) {
return atomic_add(atomic, -1);
}
void atomic_wait_until_value(struct atomic_t *atomic, int value) {
pthread_mutex_lock(&atomic->mutex);
while (atomic->value != value) {
pthread_cond_wait(&atomic->cond, &atomic->mutex);
}
pthread_mutex_unlock(&atomic->mutex);
}
static void errstack_atomic_dec(struct errstack_element_t *element) {
atomic_dec((struct atomic_t*)element->ptrvalue);
}
void errstack_push_atomic_dec(struct errstack_t *errstack, struct atomic_t *element) {
errstack_push_generic_nonnull_ptr(errstack, errstack_atomic_dec, element);
}