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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 #define USE_ATOMICS 0
  30
  31 #if HAVE_PTHREADS
  32 #include <pthread.h>
  33
  34 #if defined(ASSERT_LEVEL) && ASSERT_LEVEL > 1
  35
  36 #include "log.h"
  37
  38 #define ASSERT_PTHREAD_NORET(func, ...) do {                            \
  39     int ret = func(__VA_ARGS__);                                        \
  40     if (ret) {                                                          \
  41         av_log(NULL, AV_LOG_FATAL, AV_STRINGIFY(func)                   \
  42                " failed with error: %s\n", av_err2str(AVERROR(ret)));   \
  43         abort();                                                        \
  44     }                                                                   \
  45 } while (0)
  46
  47 #define ASSERT_PTHREAD(func, ...) do {                                  \
  48     ASSERT_PTHREAD_NORET(func, __VA_ARGS__);                            \
  49     return 0;                                                           \
  50 } while (0)
  51
  52 static inline int strict_pthread_join(pthread_t thread, void **value_ptr)
  53 {
  54     ASSERT_PTHREAD(pthread_join, thread, value_ptr);
  55 }
  56
  57 static inline int strict_pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)
  58 {
  59     if (attr) {
  60         ASSERT_PTHREAD_NORET(pthread_mutex_init, mutex, attr);
  61     } else {
  62         pthread_mutexattr_t local_attr;
  63         ASSERT_PTHREAD_NORET(pthread_mutexattr_init, &local_attr);
  64         ASSERT_PTHREAD_NORET(pthread_mutexattr_settype, &local_attr, PTHREAD_MUTEX_ERRORCHECK);
  65         ASSERT_PTHREAD_NORET(pthread_mutex_init, mutex, &local_attr);
  66         ASSERT_PTHREAD_NORET(pthread_mutexattr_destroy, &local_attr);
  67     }
  68     return 0;
  69 }
  70
  71 static inline int strict_pthread_mutex_destroy(pthread_mutex_t *mutex)
  72 {
  73     ASSERT_PTHREAD(pthread_mutex_destroy, mutex);
  74 }
  75
  76 static inline int strict_pthread_mutex_lock(pthread_mutex_t *mutex)
  77 {
  78     ASSERT_PTHREAD(pthread_mutex_lock, mutex);
  79 }
  80
  81 static inline int strict_pthread_mutex_unlock(pthread_mutex_t *mutex)
  82 {
  83     ASSERT_PTHREAD(pthread_mutex_unlock, mutex);
  84 }
  85
  86 static inline int strict_pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr)
  87 {
  88     ASSERT_PTHREAD(pthread_cond_init, cond, attr);
  89 }
  90
  91 static inline int strict_pthread_cond_destroy(pthread_cond_t *cond)
  92 {
  93     ASSERT_PTHREAD(pthread_cond_destroy, cond);
  94 }
  95
  96 static inline int strict_pthread_cond_signal(pthread_cond_t *cond)
  97 {
  98     ASSERT_PTHREAD(pthread_cond_signal, cond);
  99 }
 100
 101 static inline int strict_pthread_cond_broadcast(pthread_cond_t *cond)
 102 {
 103     ASSERT_PTHREAD(pthread_cond_broadcast, cond);
 104 }
 105
 106 static inline int strict_pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
 107 {
 108     ASSERT_PTHREAD(pthread_cond_wait, cond, mutex);
 109 }
 110
 111 static inline int strict_pthread_once(pthread_once_t *once_control, void (*init_routine)(void))
 112 {
 113     ASSERT_PTHREAD(pthread_once, once_control, init_routine);
 114 }
 115
 116 #define pthread_join           strict_pthread_join
 117 #define pthread_mutex_init     strict_pthread_mutex_init
 118 #define pthread_mutex_destroy  strict_pthread_mutex_destroy
 119 #define pthread_mutex_lock     strict_pthread_mutex_lock
 120 #define pthread_mutex_unlock   strict_pthread_mutex_unlock
 121 #define pthread_cond_init      strict_pthread_cond_init
 122 #define pthread_cond_destroy   strict_pthread_cond_destroy
 123 #define pthread_cond_signal    strict_pthread_cond_signal
 124 #define pthread_cond_broadcast strict_pthread_cond_broadcast
 125 #define pthread_cond_wait      strict_pthread_cond_wait
 126 #define pthread_once           strict_pthread_once
 127 #endif
 128
 129 #elif HAVE_OS2THREADS
 130 #include "compat/os2threads.h"
 131 #else
 132 #include "compat/w32pthreads.h"
 133 #endif
 134
 135 #define AVMutex pthread_mutex_t
 136
 137 #define ff_mutex_init    pthread_mutex_init
 138 #define ff_mutex_lock    pthread_mutex_lock
 139 #define ff_mutex_unlock  pthread_mutex_unlock
 140 #define ff_mutex_destroy pthread_mutex_destroy
 141
 142 #define AVOnce pthread_once_t
 143 #define AV_ONCE_INIT PTHREAD_ONCE_INIT
 144
 145 #define ff_thread_once(control, routine) pthread_once(control, routine)
 146
 147 #else
 148
 149 #define USE_ATOMICS 1
 150
 151 #define AVMutex char
 152
 153 #define ff_mutex_init(mutex, attr) (0)
 154 #define ff_mutex_lock(mutex) (0)
 155 #define ff_mutex_unlock(mutex) (0)
 156 #define ff_mutex_destroy(mutex) (0)
 157
 158 #define AVOnce char
 159 #define AV_ONCE_INIT 0
 160
 161 static inline int ff_thread_once(char *control, void (*routine)(void))
 162 {
 163     if (!*control) {
 164         routine();
 165         *control = 1;
 166     }
 167     return 0;
 168 }
 169
 170 #endif
 171
 172 #endif /* AVUTIL_THREAD_H */