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   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * FFmpeg is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with FFmpeg; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 // This header should only be used to simplify code where
  20 // threading is optional, not as a generic threading abstraction.
  21
  22 #ifndef AVUTIL_THREAD_H
  23 #define AVUTIL_THREAD_H
  24
  25 #include "config.h"
  26
  27 #if HAVE_PTHREADS || HAVE_W32THREADS || HAVE_OS2THREADS
  28
  29 #if HAVE_PTHREADS
  30 #include <pthread.h>
  31
  32 #if defined(ASSERT_LEVEL) && ASSERT_LEVEL > 1
  33
  34 #include "log.h"
  35
  36 #define ASSERT_PTHREAD_ABORT(func, ret) do {                            \
  37     char errbuf[AV_ERROR_MAX_STRING_SIZE] = "";                         \
  38     av_log(NULL, AV_LOG_FATAL, AV_STRINGIFY(func)                       \
  39            " failed with error: %s\n",                                  \
  40            av_make_error_string(errbuf, AV_ERROR_MAX_STRING_SIZE,       \
  41                                 AVERROR(ret)));                         \
  42     abort();                                                            \
  43 } while (0)
  44
  45 #define ASSERT_PTHREAD_NORET(func, ...) do {                            \
  46     int ret = func(__VA_ARGS__);                                        \
  47     if (ret)                                                            \
  48         ASSERT_PTHREAD_ABORT(func, ret);                                \
  49 } while (0)
  50
  51 #define ASSERT_PTHREAD(func, ...) do {                                  \
  52     ASSERT_PTHREAD_NORET(func, __VA_ARGS__);                            \
  53     return 0;                                                           \
  54 } while (0)
  55
  56 static inline int strict_pthread_join(pthread_t thread, void **value_ptr)
  57 {
  58     ASSERT_PTHREAD(pthread_join, thread, value_ptr);
  59 }
  60
  61 static inline int strict_pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)
  62 {
  63     if (attr) {
  64         ASSERT_PTHREAD_NORET(pthread_mutex_init, mutex, attr);
  65     } else {
  66         pthread_mutexattr_t local_attr;
  67         ASSERT_PTHREAD_NORET(pthread_mutexattr_init, &local_attr);
  68         ASSERT_PTHREAD_NORET(pthread_mutexattr_settype, &local_attr, PTHREAD_MUTEX_ERRORCHECK);
  69         ASSERT_PTHREAD_NORET(pthread_mutex_init, mutex, &local_attr);
  70         ASSERT_PTHREAD_NORET(pthread_mutexattr_destroy, &local_attr);
  71     }
  72     return 0;
  73 }
  74
  75 static inline int strict_pthread_mutex_destroy(pthread_mutex_t *mutex)
  76 {
  77     ASSERT_PTHREAD(pthread_mutex_destroy, mutex);
  78 }
  79
  80 static inline int strict_pthread_mutex_lock(pthread_mutex_t *mutex)
  81 {
  82     ASSERT_PTHREAD(pthread_mutex_lock, mutex);
  83 }
  84
  85 static inline int strict_pthread_mutex_unlock(pthread_mutex_t *mutex)
  86 {
  87     ASSERT_PTHREAD(pthread_mutex_unlock, mutex);
  88 }
  89
  90 static inline int strict_pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr)
  91 {
  92     ASSERT_PTHREAD(pthread_cond_init, cond, attr);
  93 }
  94
  95 static inline int strict_pthread_cond_destroy(pthread_cond_t *cond)
  96 {
  97     ASSERT_PTHREAD(pthread_cond_destroy, cond);
  98 }
  99
 100 static inline int strict_pthread_cond_signal(pthread_cond_t *cond)
 101 {
 102     ASSERT_PTHREAD(pthread_cond_signal, cond);
 103 }
 104
 105 static inline int strict_pthread_cond_broadcast(pthread_cond_t *cond)
 106 {
 107     ASSERT_PTHREAD(pthread_cond_broadcast, cond);
 108 }
 109
 110 static inline int strict_pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
 111 {
 112     ASSERT_PTHREAD(pthread_cond_wait, cond, mutex);
 113 }
 114
 115 static inline int strict_pthread_cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex,
 116                                                 const struct timespec *abstime)
 117 {
 118     int ret = pthread_cond_timedwait(cond, mutex, abstime);
 119     if (ret && ret != ETIMEDOUT)
 120         ASSERT_PTHREAD_ABORT(pthread_cond_timedwait, ret);
 121     return ret;
 122 }
 123
 124 static inline int strict_pthread_once(pthread_once_t *once_control, void (*init_routine)(void))
 125 {
 126     ASSERT_PTHREAD(pthread_once, once_control, init_routine);
 127 }
 128
 129 #define pthread_join           strict_pthread_join
 130 #define pthread_mutex_init     strict_pthread_mutex_init
 131 #define pthread_mutex_destroy  strict_pthread_mutex_destroy
 132 #define pthread_mutex_lock     strict_pthread_mutex_lock
 133 #define pthread_mutex_unlock   strict_pthread_mutex_unlock
 134 #define pthread_cond_init      strict_pthread_cond_init
 135 #define pthread_cond_destroy   strict_pthread_cond_destroy
 136 #define pthread_cond_signal    strict_pthread_cond_signal
 137 #define pthread_cond_broadcast strict_pthread_cond_broadcast
 138 #define pthread_cond_wait      strict_pthread_cond_wait
 139 #define pthread_cond_timedwait strict_pthread_cond_timedwait
 140 #define pthread_once           strict_pthread_once
 141 #endif
 142
 143 #elif HAVE_OS2THREADS
 144 #include "compat/os2threads.h"
 145 #else
 146 #include "compat/w32pthreads.h"
 147 #endif
 148
 149 #define AVMutex pthread_mutex_t
 150 #define AV_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
 151
 152 #define ff_mutex_init    pthread_mutex_init
 153 #define ff_mutex_lock    pthread_mutex_lock
 154 #define ff_mutex_unlock  pthread_mutex_unlock
 155 #define ff_mutex_destroy pthread_mutex_destroy
 156
 157 #define AVOnce pthread_once_t
 158 #define AV_ONCE_INIT PTHREAD_ONCE_INIT
 159
 160 #define ff_thread_once(control, routine) pthread_once(control, routine)
 161
 162 #else
 163
 164 #define AVMutex char
 165 #define AV_MUTEX_INITIALIZER 0
 166
 167 static inline int ff_mutex_init(AVMutex *mutex, const void *attr){ return 0; }
 168 static inline int ff_mutex_lock(AVMutex *mutex){ return 0; }
 169 static inline int ff_mutex_unlock(AVMutex *mutex){ return 0; }
 170 static inline int ff_mutex_destroy(AVMutex *mutex){ return 0; }
 171
 172 #define AVOnce char
 173 #define AV_ONCE_INIT 0
 174
 175 static inline int ff_thread_once(char *control, void (*routine)(void))
 176 {
 177     if (!*control) {
 178         routine();
 179         *control = 1;
 180     }
 181     return 0;
 182 }
 183
 184 #endif
 185
 186 #endif /* AVUTIL_THREAD_H */