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
|
/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#ifndef ISC_MUTEX_H
#define ISC_MUTEX_H 1
/*! \file */
#include <pthread.h>
#include <stdio.h>
#include <isc/lang.h>
#include <isc/result.h> /* for ISC_R_ codes */
ISC_LANG_BEGINDECLS
/*!
* Supply mutex attributes that enable deadlock detection
* (helpful when debugging). This is system dependent and
* currently only supported on NetBSD.
*/
#if ISC_MUTEX_DEBUG && defined(__NetBSD__) && defined(PTHREAD_MUTEX_ERRORCHECK)
extern pthread_mutexattr_t isc__mutex_attrs;
#define ISC__MUTEX_ATTRS &isc__mutex_attrs
#else
#define ISC__MUTEX_ATTRS NULL
#endif
/* XXX We could do fancier error handling... */
/*!
* Define ISC_MUTEX_PROFILE to turn on profiling of mutexes by line. When
* enabled, isc_mutex_stats() can be used to print a table showing the
* number of times each type of mutex was locked and the amount of time
* waiting to obtain the lock.
*/
#ifndef ISC_MUTEX_PROFILE
#define ISC_MUTEX_PROFILE 0
#endif
#if ISC_MUTEX_PROFILE
typedef struct isc_mutexstats isc_mutexstats_t;
typedef struct {
pthread_mutex_t mutex; /*%< The actual mutex. */
isc_mutexstats_t * stats; /*%< Mutex statistics. */
} isc_mutex_t;
#else
typedef pthread_mutex_t isc_mutex_t;
#endif
#if ISC_MUTEX_PROFILE
#define isc_mutex_init(mp) \
isc_mutex_init_profile((mp), __FILE__, __LINE__)
#else
#if ISC_MUTEX_DEBUG && defined(PTHREAD_MUTEX_ERRORCHECK)
#define isc_mutex_init(mp) \
isc_mutex_init_errcheck((mp))
#else
#define isc_mutex_init(mp) \
isc__mutex_init((mp), __FILE__, __LINE__)
isc_result_t isc__mutex_init(isc_mutex_t *mp, const char *file, unsigned int line);
#endif
#endif
#if ISC_MUTEX_PROFILE
#define isc_mutex_lock(mp) \
isc_mutex_lock_profile((mp), __FILE__, __LINE__)
#else
#define isc_mutex_lock(mp) \
((pthread_mutex_lock((mp)) == 0) ? \
ISC_R_SUCCESS : ISC_R_UNEXPECTED)
#endif
#if ISC_MUTEX_PROFILE
#define isc_mutex_unlock(mp) \
isc_mutex_unlock_profile((mp), __FILE__, __LINE__)
#else
#define isc_mutex_unlock(mp) \
((pthread_mutex_unlock((mp)) == 0) ? \
ISC_R_SUCCESS : ISC_R_UNEXPECTED)
#endif
#if ISC_MUTEX_PROFILE
#define isc_mutex_trylock(mp) \
((pthread_mutex_trylock((&(mp)->mutex)) == 0) ? \
ISC_R_SUCCESS : ISC_R_LOCKBUSY)
#else
#define isc_mutex_trylock(mp) \
((pthread_mutex_trylock((mp)) == 0) ? \
ISC_R_SUCCESS : ISC_R_LOCKBUSY)
#endif
#if ISC_MUTEX_PROFILE
#define isc_mutex_destroy(mp) \
((pthread_mutex_destroy((&(mp)->mutex)) == 0) ? \
ISC_R_SUCCESS : ISC_R_UNEXPECTED)
#else
#define isc_mutex_destroy(mp) \
((pthread_mutex_destroy((mp)) == 0) ? \
ISC_R_SUCCESS : ISC_R_UNEXPECTED)
#endif
#if ISC_MUTEX_PROFILE
#define isc_mutex_stats(fp) isc_mutex_statsprofile(fp);
#else
#define isc_mutex_stats(fp)
#endif
#if ISC_MUTEX_PROFILE
isc_result_t
isc_mutex_init_profile(isc_mutex_t *mp, const char * _file, int _line);
isc_result_t
isc_mutex_lock_profile(isc_mutex_t *mp, const char * _file, int _line);
isc_result_t
isc_mutex_unlock_profile(isc_mutex_t *mp, const char * _file, int _line);
void
isc_mutex_statsprofile(FILE *fp);
isc_result_t
isc_mutex_init_errcheck(isc_mutex_t *mp);
#endif /* ISC_MUTEX_PROFILE */
ISC_LANG_ENDDECLS
#endif /* ISC_MUTEX_H */
|