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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_NORET(func, ...) do {                            \
  37     int ret = func(__VA_ARGS__);                                        \
  38     if (ret) {                                                          \
  39         av_log(NULL, AV_LOG_FATAL, AV_STRINGIFY(func)                   \
  40                " failed with error: %s\n", av_err2str(AVERROR(ret)));   \
  41         abort();                                                        \
  42     }                                                                   \
  43 } while (0)
  44
  45 #define ASSERT_PTHREAD(func, ...) do {                                  \
  46     ASSERT_PTHREAD_NORET(func, __VA_ARGS__);                            \
  47     return 0;                                                           \
  48 } while (0)
  49
  50 static inline int strict_pthread_join(pthread_t thread, void **value_ptr)
  51 {
  52     ASSERT_PTHREAD(pthread_join, thread, value_ptr);
  53 }
  54
  55 static inline int strict_pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)
  56 {
  57     if (attr) {
  58         ASSERT_PTHREAD_NORET(pthread_mutex_init, mutex, attr);
  59     } else {
  60         pthread_mutexattr_t local_attr;
  61         ASSERT_PTHREAD_NORET(pthread_mutexattr_init, &local_attr);
  62         ASSERT_PTHREAD_NORET(pthread_mutexattr_settype, &local_attr, PTHREAD_MUTEX_ERRORCHECK);
  63         ASSERT_PTHREAD_NORET(pthread_mutex_init, mutex, &local_attr);
  64         ASSERT_PTHREAD_NORET(pthread_mutexattr_destroy, &local_attr);
  65     }
  66     return 0;
  67 }
  68
  69 static inline int strict_pthread_mutex_destroy(pthread_mutex_t *mutex)
  70 {
  71     ASSERT_PTHREAD(pthread_mutex_destroy, mutex);
  72 }
  73
  74 static inline int strict_pthread_mutex_lock(pthread_mutex_t *mutex)
  75 {
  76     ASSERT_PTHREAD(pthread_mutex_lock, mutex);
  77 }
  78
  79 static inline int strict_pthread_mutex_unlock(pthread_mutex_t *mutex)
  80 {
  81     ASSERT_PTHREAD(pthread_mutex_unlock, mutex);
  82 }
  83
  84 static inline int strict_pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr)
  85 {
  86     ASSERT_PTHREAD(pthread_cond_init, cond, attr);
  87 }
  88
  89 static inline int strict_pthread_cond_destroy(pthread_cond_t *cond)
  90 {
  91     ASSERT_PTHREAD(pthread_cond_destroy, cond);
  92 }
  93
  94 static inline int strict_pthread_cond_signal(pthread_cond_t *cond)
  95 {
  96     ASSERT_PTHREAD(pthread_cond_signal, cond);
  97 }
  98
  99 static inline int strict_pthread_cond_broadcast(pthread_cond_t *cond)
 100 {
 101     ASSERT_PTHREAD(pthread_cond_broadcast, cond);
 102 }
 103
 104 static inline int strict_pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
 105 {
 106     ASSERT_PTHREAD(pthread_cond_wait, cond, mutex);
 107 }
 108
 109 static inline int strict_pthread_once(pthread_once_t *once_control, void (*init_routine)(void))
 110 {
 111     ASSERT_PTHREAD(pthread_once, once_control, init_routine);
 112 }
 113
 114 #define pthread_join           strict_pthread_join
 115 #define pthread_mutex_init     strict_pthread_mutex_init
 116 #define pthread_mutex_destroy  strict_pthread_mutex_destroy
 117 #define pthread_mutex_lock     strict_pthread_mutex_lock
 118 #define pthread_mutex_unlock   strict_pthread_mutex_unlock
 119 #define pthread_cond_init      strict_pthread_cond_init
 120 #define pthread_cond_destroy   strict_pthread_cond_destroy
 121 #define pthread_cond_signal    strict_pthread_cond_signal
 122 #define pthread_cond_broadcast strict_pthread_cond_broadcast
 123 #define pthread_cond_wait      strict_pthread_cond_wait
 124 #define pthread_once           strict_pthread_once
 125 #endif
 126
 127 #elif HAVE_OS2THREADS
 128 #include "compat/os2threads.h"
 129 #else
 130 #include "compat/w32pthreads.h"
 131 #endif
 132
 133 #define AVMutex pthread_mutex_t
 134
 135 #define ff_mutex_init    pthread_mutex_init
 136 #define ff_mutex_lock    pthread_mutex_lock
 137 #define ff_mutex_unlock  pthread_mutex_unlock
 138 #define ff_mutex_destroy pthread_mutex_destroy
 139
 140 #define AVOnce pthread_once_t
 141 #define AV_ONCE_INIT PTHREAD_ONCE_INIT
 142
 143 #define ff_thread_once(control, routine) pthread_once(control, routine)
 144
 145 #else
 146
 147 #define AVMutex char
 148
 149 #define ff_mutex_init(mutex, attr) (0)
 150 #define ff_mutex_lock(mutex) (0)
 151 #define ff_mutex_unlock(mutex) (0)
 152 #define ff_mutex_destroy(mutex) (0)
 153
 154 #define AVOnce char
 155 #define AV_ONCE_INIT 0
 156
 157 static inline int ff_thread_once(char *control, void (*routine)(void))
 158 {
 159     if (!*control) {
 160         routine();
 161         *control = 1;
 162     }
 163     return 0;
 164 }
 165
 166 #endif
 167
 168 #endif /* AVUTIL_THREAD_H */