/usr/include/mysql/thr_mutex.h is in libmysqlclient-dev 5.7.25-0ubuntu0.16.04.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 | #ifndef THR_MUTEX_INCLUDED
#define THR_MUTEX_INCLUDED
/* Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
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; version 2 of the License.
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/**
MySQL mutex implementation.
There are three "layers":
1) native_mutex_*()
Functions that map directly down to OS primitives.
Windows - CriticalSection
Other OSes - pthread
2) my_mutex_*()
Functions that implement SAFE_MUTEX (default for debug),
Otherwise native_mutex_*() is used.
3) mysql_mutex_*()
Functions that include Performance Schema instrumentation.
See include/mysql/psi/mysql_thread.h
*/
#include <my_global.h>
#include "my_thread.h"
C_MODE_START
#ifdef _WIN32
typedef CRITICAL_SECTION native_mutex_t;
typedef int native_mutexattr_t;
#else
typedef pthread_mutex_t native_mutex_t;
typedef pthread_mutexattr_t native_mutexattr_t;
#endif
/* Define mutex types, see my_thr_init.c */
#define MY_MUTEX_INIT_SLOW NULL
/* Can be set in /usr/include/pthread.h */
#ifdef PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
extern native_mutexattr_t my_fast_mutexattr;
#define MY_MUTEX_INIT_FAST &my_fast_mutexattr
#else
#define MY_MUTEX_INIT_FAST NULL
#endif
/* Can be set in /usr/include/pthread.h */
#ifdef PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP
extern native_mutexattr_t my_errorcheck_mutexattr;
#define MY_MUTEX_INIT_ERRCHK &my_errorcheck_mutexattr
#else
#define MY_MUTEX_INIT_ERRCHK NULL
#endif
static inline int native_mutex_init(native_mutex_t *mutex,
const native_mutexattr_t *attr)
{
#ifdef _WIN32
InitializeCriticalSection(mutex);
return 0;
#else
return pthread_mutex_init(mutex, attr);
#endif
}
static inline int native_mutex_lock(native_mutex_t *mutex)
{
#ifdef _WIN32
EnterCriticalSection(mutex);
return 0;
#else
return pthread_mutex_lock(mutex);
#endif
}
static inline int native_mutex_trylock(native_mutex_t *mutex)
{
#ifdef _WIN32
if (TryEnterCriticalSection(mutex))
{
/* Don't allow recursive lock */
if (mutex->RecursionCount > 1){
LeaveCriticalSection(mutex);
return EBUSY;
}
return 0;
}
return EBUSY;
#else
return pthread_mutex_trylock(mutex);
#endif
}
static inline int native_mutex_unlock(native_mutex_t *mutex)
{
#ifdef _WIN32
LeaveCriticalSection(mutex);
return 0;
#else
return pthread_mutex_unlock(mutex);
#endif
}
static inline int native_mutex_destroy(native_mutex_t *mutex)
{
#ifdef _WIN32
DeleteCriticalSection(mutex);
return 0;
#else
return pthread_mutex_destroy(mutex);
#endif
}
#ifdef SAFE_MUTEX
/* safe_mutex adds checking to mutex for easier debugging */
typedef struct st_safe_mutex_t
{
native_mutex_t global, mutex;
const char *file;
uint line, count;
my_thread_t thread;
} my_mutex_t;
void safe_mutex_global_init();
int safe_mutex_init(my_mutex_t *mp, const native_mutexattr_t *attr,
const char *file, uint line);
int safe_mutex_lock(my_mutex_t *mp, my_bool try_lock, const char *file, uint line);
int safe_mutex_unlock(my_mutex_t *mp, const char *file, uint line);
int safe_mutex_destroy(my_mutex_t *mp, const char *file, uint line);
static inline void safe_mutex_assert_owner(const my_mutex_t *mp)
{
DBUG_ASSERT(mp->count > 0 &&
my_thread_equal(my_thread_self(), mp->thread));
}
static inline void safe_mutex_assert_not_owner(const my_mutex_t *mp)
{
DBUG_ASSERT(!mp->count ||
!my_thread_equal(my_thread_self(), mp->thread));
}
#else
typedef native_mutex_t my_mutex_t;
#endif
static inline int my_mutex_init(my_mutex_t *mp, const native_mutexattr_t *attr
#ifdef SAFE_MUTEX
, const char *file, uint line
#endif
)
{
#ifdef SAFE_MUTEX
return safe_mutex_init(mp, attr, file, line);
#else
return native_mutex_init(mp, attr);
#endif
}
static inline int my_mutex_lock(my_mutex_t *mp
#ifdef SAFE_MUTEX
, const char *file, uint line
#endif
)
{
#ifdef SAFE_MUTEX
return safe_mutex_lock(mp, FALSE, file, line);
#else
return native_mutex_lock(mp);
#endif
}
static inline int my_mutex_trylock(my_mutex_t *mp
#ifdef SAFE_MUTEX
, const char *file, uint line
#endif
)
{
#ifdef SAFE_MUTEX
return safe_mutex_lock(mp, TRUE, file, line);
#else
return native_mutex_trylock(mp);
#endif
}
static inline int my_mutex_unlock(my_mutex_t *mp
#ifdef SAFE_MUTEX
, const char *file, uint line
#endif
)
{
#ifdef SAFE_MUTEX
return safe_mutex_unlock(mp, file, line);
#else
return native_mutex_unlock(mp);
#endif
}
static inline int my_mutex_destroy(my_mutex_t *mp
#ifdef SAFE_MUTEX
, const char *file, uint line
#endif
)
{
#ifdef SAFE_MUTEX
return safe_mutex_destroy(mp, file, line);
#else
return native_mutex_destroy(mp);
#endif
}
C_MODE_END
#endif /* THR_MUTEX_INCLUDED */
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