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
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
/*
* Copyright (C) 2008 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* 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 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
/**
* @defgroup mutex mutex
* @{ @ingroup utils
*/
#ifndef MUTEX_H_
#define MUTEX_H_
typedef struct mutex_t mutex_t;
typedef struct condvar_t condvar_t;
typedef struct rwlock_t rwlock_t;
typedef enum mutex_type_t mutex_type_t;
typedef enum condvar_type_t condvar_type_t;
typedef enum rwlock_type_t rwlock_type_t;
#include <library.h>
/**
* Type of mutex.
*/
enum mutex_type_t {
/** default mutex */
MUTEX_DEFAULT = 0,
/** allow recursive locking of the mutex */
MUTEX_RECURSIVE = 1,
};
/**
* Type of condvar.
*/
enum condvar_type_t {
/** default condvar */
CONDVAR_DEFAULT = 0,
};
/**
* Type of read-write lock.
*/
enum rwlock_type_t {
/** default condvar */
RWLOCK_DEFAULT = 0,
};
/**
* Mutex wrapper implements simple, portable and advanced mutex functions.
*/
struct mutex_t {
/**
* Acquire the lock to the mutex.
*/
void (*lock)(mutex_t *this);
/**
* Release the lock on the mutex.
*/
void (*unlock)(mutex_t *this);
/**
* Destroy a mutex instance.
*/
void (*destroy)(mutex_t *this);
};
/**
* Condvar wrapper to use in conjunction with mutex_t.
*/
struct condvar_t {
/**
* Wait on a condvar until it gets signalized.
*
* @param mutex mutex to release while waiting
*/
void (*wait)(condvar_t *this, mutex_t *mutex);
/**
* Wait on a condvar until it gets signalized, or times out.
*
* @param mutex mutex to release while waiting
* @param timeout timeout im ms
* @return TRUE if timed out, FALSE otherwise
*/
bool (*timed_wait)(condvar_t *this, mutex_t *mutex, u_int timeout);
/**
* Wake up a single thread in a condvar.
*/
void (*signal)(condvar_t *this);
/**
* Wake up all threads in a condvar.
*/
void (*broadcast)(condvar_t *this);
/**
* Destroy a condvar and free its resources.
*/
void (*destroy)(condvar_t *this);
};
/**
* Read-Write lock wrapper.
*/
struct rwlock_t {
/**
* Acquire the read lock.
*/
void (*read_lock)(rwlock_t *this);
/**
* Acquire the write lock.
*/
void (*write_lock)(rwlock_t *this);
/**
* Try to acquire the write lock.
*
* Never blocks, but returns FALSE if the lock was already occupied.
*
* @return TRUE if lock acquired
*/
bool (*try_write_lock)(rwlock_t *this);
/**
* Release any acquired lock.
*/
void (*unlock)(rwlock_t *this);
/**
* Destroy the read-write lock.
*/
void (*destroy)(rwlock_t *this);
};
/**
* Create a mutex instance.
*
* @param type type of mutex to create
* @return unlocked mutex instance
*/
mutex_t *mutex_create(mutex_type_t type);
/**
* Create a condvar instance.
*
* @param type type of condvar to create
* @return condvar instance
*/
condvar_t *condvar_create(condvar_type_t type);
/**
* Create a read-write lock instance.
*
* @param type type of rwlock to create
* @return unlocked rwlock instance
*/
rwlock_t *rwlock_create(rwlock_type_t type);
#endif /* MUTEX_H_ @}*/
|
