/usr/include/mysql/thr_cond.h is in libmysqlclient-dev 5.7.21-1ubuntu1.
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 | #ifndef THR_COND_INCLUDED
#define THR_COND_INCLUDED
/* Copyright (c) 2014, 2016, 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 condition variable implementation.
There are three "layers":
1) native_cond_*()
Functions that map directly down to OS primitives.
Windows - ConditionVariable
Other OSes - pthread
2) my_cond_*()
Functions that use SAFE_MUTEX (default for debug).
Otherwise native_cond_*() is used.
3) mysql_cond*()
Functions that include Performance Schema instrumentation.
See include/mysql/psi/mysql_thread.h
*/
#include "my_thread.h"
#include "thr_mutex.h"
C_MODE_START
#ifdef _WIN32
typedef CONDITION_VARIABLE native_cond_t;
#else
typedef pthread_cond_t native_cond_t;
#endif
#ifdef _WIN32
/**
Convert abstime to milliseconds
*/
static DWORD get_milliseconds(const struct timespec *abstime)
{
#ifndef HAVE_STRUCT_TIMESPEC
long long millis;
union ft64 now;
if (abstime == NULL)
return INFINITE;
GetSystemTimeAsFileTime(&now.ft);
/*
Calculate time left to abstime
- subtract start time from current time(values are in 100ns units)
- convert to millisec by dividing with 10000
*/
millis= (abstime->tv.i64 - now.i64) / 10000;
/* Don't allow the timeout to be negative */
if (millis < 0)
return 0;
/*
Make sure the calculated timeout does not exceed original timeout
value which could cause "wait for ever" if system time changes
*/
if (millis > abstime->max_timeout_msec)
millis= abstime->max_timeout_msec;
if (millis > UINT_MAX)
millis= UINT_MAX;
return (DWORD)millis;
#else
/*
Convert timespec to millis and subtract current time.
my_getsystime() returns time in 100 ns units.
*/
ulonglong future= abstime->tv_sec * 1000 + abstime->tv_nsec / 1000000;
ulonglong now= my_getsystime() / 10000;
/* Don't allow the timeout to be negative. */
if (future < now)
return 0;
return (DWORD)(future - now);
#endif
}
#endif /* _WIN32 */
static inline int native_cond_init(native_cond_t *cond)
{
#ifdef _WIN32
InitializeConditionVariable(cond);
return 0;
#else
/* pthread_condattr_t is not used in MySQL */
return pthread_cond_init(cond, NULL);
#endif
}
static inline int native_cond_destroy(native_cond_t *cond)
{
#ifdef _WIN32
return 0; /* no destroy function */
#else
return pthread_cond_destroy(cond);
#endif
}
static inline int native_cond_timedwait(native_cond_t *cond,
native_mutex_t *mutex,
const struct timespec *abstime)
{
#ifdef _WIN32
DWORD timeout= get_milliseconds(abstime);
if (!SleepConditionVariableCS(cond, mutex, timeout))
return ETIMEDOUT;
return 0;
#else
return pthread_cond_timedwait(cond, mutex, abstime);
#endif
}
static inline int native_cond_wait(native_cond_t *cond, native_mutex_t *mutex)
{
#ifdef _WIN32
if (!SleepConditionVariableCS(cond, mutex, INFINITE))
return ETIMEDOUT;
return 0;
#else
return pthread_cond_wait(cond, mutex);
#endif
}
static inline int native_cond_signal(native_cond_t *cond)
{
#ifdef _WIN32
WakeConditionVariable(cond);
return 0;
#else
return pthread_cond_signal(cond);
#endif
}
static inline int native_cond_broadcast(native_cond_t *cond)
{
#ifdef _WIN32
WakeAllConditionVariable(cond);
return 0;
#else
return pthread_cond_broadcast(cond);
#endif
}
#ifdef SAFE_MUTEX
int safe_cond_wait(native_cond_t *cond, my_mutex_t *mp,
const char *file, uint line);
int safe_cond_timedwait(native_cond_t *cond, my_mutex_t *mp,
const struct timespec *abstime,
const char *file, uint line);
#endif
static inline int my_cond_timedwait(native_cond_t *cond, my_mutex_t *mp,
const struct timespec *abstime
#ifdef SAFE_MUTEX
, const char *file, uint line
#endif
)
{
#ifdef SAFE_MUTEX
return safe_cond_timedwait(cond, mp, abstime, file, line);
#else
return native_cond_timedwait(cond, mp, abstime);
#endif
}
static inline int my_cond_wait(native_cond_t *cond, my_mutex_t *mp
#ifdef SAFE_MUTEX
, const char *file, uint line
#endif
)
{
#ifdef SAFE_MUTEX
return safe_cond_wait(cond, mp, file, line);
#else
return native_cond_wait(cond, mp);
#endif
}
C_MODE_END
#endif /* THR_COND_INCLUDED */
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