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
|
/*
* Copyright (c) 2014, Linaro Limited
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef KERNEL_MUTEX_H
#define KERNEL_MUTEX_H
#include <types_ext.h>
#include <sys/queue.h>
#include <kernel/wait_queue.h>
enum mutex_value {
MUTEX_VALUE_UNLOCKED,
MUTEX_VALUE_LOCKED,
};
/*
* Positive owner ids signifies actual threads, negative ids has special
* meanings according to the defines below. Note that only the first of the
* defines is allowed in struct mutex::owener_id.
*/
#define MUTEX_OWNER_ID_NONE -1
#define MUTEX_OWNER_ID_CONDVAR_SLEEP -2
#define MUTEX_OWNER_ID_MUTEX_UNLOCK -3
struct mutex {
enum mutex_value value;
unsigned spin_lock; /* used when operating on this struct */
struct wait_queue wq;
int owner_id;
TAILQ_ENTRY(mutex) link;
};
#define MUTEX_INITIALIZER \
{ .value = MUTEX_VALUE_UNLOCKED, .owner_id = MUTEX_OWNER_ID_NONE, \
.wq = WAIT_QUEUE_INITIALIZER, }
TAILQ_HEAD(mutex_head, mutex);
void mutex_init(struct mutex *m);
void mutex_destroy(struct mutex *m);
#ifdef CFG_MUTEX_DEBUG
void mutex_unlock_debug(struct mutex *m, const char *fname, int lineno);
#define mutex_unlock(m) mutex_unlock_debug((m), __FILE__, __LINE__)
void mutex_lock_debug(struct mutex *m, const char *fname, int lineno);
#define mutex_lock(m) mutex_lock_debug((m), __FILE__, __LINE__)
bool mutex_trylock_debug(struct mutex *m, const char *fname, int lineno);
#define mutex_trylock(m) mutex_trylock_debug((m), __FILE__, __LINE__)
#else
void mutex_unlock(struct mutex *m);
void mutex_lock(struct mutex *m);
bool mutex_trylock(struct mutex *m);
#endif
struct condvar {
unsigned spin_lock;
struct mutex *m;
};
#define CONDVAR_INITIALIZER { .m = NULL }
void condvar_init(struct condvar *cv);
void condvar_destroy(struct condvar *cv);
#ifdef CFG_MUTEX_DEBUG
void condvar_signal_debug(struct condvar *cv, const char *fname, int lineno);
#define condvar_signal(cv) condvar_signal_debug((cv), __FILE__, __LINE__)
void condvar_broadcast_debug(struct condvar *cv, const char *fname, int lineno);
#define condvar_broadcast(cv) condvar_broadcast_debug((cv), __FILE__, __LINE__)
void condvar_wait_debug(struct condvar *cv, struct mutex *m,
const char *fname, int lineno);
#define condvar_wait(cv, m) condvar_wait_debug((cv), (m), __FILE__, __LINE__)
#else
void condvar_signal(struct condvar *cv);
void condvar_broadcast(struct condvar *cv);
void condvar_wait(struct condvar *cv, struct mutex *m);
#endif
#endif /*KERNEL_MUTEX_H*/
|
