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   1 /*
   2  * Copyright (c) 2011-2017 KO Myung-Hun <komh@chollian.net>
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 /**
  22  * @file
  23  * os2threads to pthreads wrapper
  24  */
  25
  26 #ifndef COMPAT_OS2THREADS_H
  27 #define COMPAT_OS2THREADS_H
  28
  29 #define INCL_DOS
  30 #include <os2.h>
  31
  32 #undef __STRICT_ANSI__          /* for _beginthread() */
  33 #include <stdlib.h>
  34
  35 #include <sys/builtin.h>
  36 #include <sys/fmutex.h>
  37
  38 #include "libavutil/attributes.h"
  39
  40 typedef struct {
  41     TID tid;
  42     void *(*start_routine)(void *);
  43     void *arg;
  44     void *result;
  45 } pthread_t;
  46
  47 typedef void pthread_attr_t;
  48
  49 typedef _fmutex pthread_mutex_t;
  50 typedef void pthread_mutexattr_t;
  51
  52 #define PTHREAD_MUTEX_INITIALIZER _FMUTEX_INITIALIZER
  53
  54 typedef struct {
  55     HEV event_sem;
  56     HEV ack_sem;
  57     volatile unsigned  wait_count;
  58 } pthread_cond_t;
  59
  60 typedef void pthread_condattr_t;
  61
  62 typedef struct {
  63     volatile int done;
  64     _fmutex mtx;
  65 } pthread_once_t;
  66
  67 #define PTHREAD_ONCE_INIT {0, _FMUTEX_INITIALIZER}
  68
  69 static void thread_entry(void *arg)
  70 {
  71     pthread_t *thread = arg;
  72
  73     thread->result = thread->start_routine(thread->arg);
  74 }
  75
  76 static av_always_inline int pthread_create(pthread_t *thread,
  77                                            const pthread_attr_t *attr,
  78                                            void *(*start_routine)(void*),
  79                                            void *arg)
  80 {
  81     thread->start_routine = start_routine;
  82     thread->arg = arg;
  83     thread->result = NULL;
  84
  85     thread->tid = _beginthread(thread_entry, NULL, 1024 * 1024, thread);
  86
  87     return 0;
  88 }
  89
  90 static av_always_inline int pthread_join(pthread_t thread, void **value_ptr)
  91 {
  92     DosWaitThread(&thread.tid, DCWW_WAIT);
  93
  94     if (value_ptr)
  95         *value_ptr = thread.result;
  96
  97     return 0;
  98 }
  99
 100 static av_always_inline int pthread_mutex_init(pthread_mutex_t *mutex,
 101                                                const pthread_mutexattr_t *attr)
 102 {
 103     _fmutex_create(mutex, 0);
 104
 105     return 0;
 106 }
 107
 108 static av_always_inline int pthread_mutex_destroy(pthread_mutex_t *mutex)
 109 {
 110     _fmutex_close(mutex);
 111
 112     return 0;
 113 }
 114
 115 static av_always_inline int pthread_mutex_lock(pthread_mutex_t *mutex)
 116 {
 117     _fmutex_request(mutex, 0);
 118
 119     return 0;
 120 }
 121
 122 static av_always_inline int pthread_mutex_unlock(pthread_mutex_t *mutex)
 123 {
 124     _fmutex_release(mutex);
 125
 126     return 0;
 127 }
 128
 129 static av_always_inline int pthread_cond_init(pthread_cond_t *cond,
 130                                               const pthread_condattr_t *attr)
 131 {
 132     DosCreateEventSem(NULL, &cond->event_sem, DCE_POSTONE, FALSE);
 133     DosCreateEventSem(NULL, &cond->ack_sem, DCE_POSTONE, FALSE);
 134
 135     cond->wait_count = 0;
 136
 137     return 0;
 138 }
 139
 140 static av_always_inline int pthread_cond_destroy(pthread_cond_t *cond)
 141 {
 142     DosCloseEventSem(cond->event_sem);
 143     DosCloseEventSem(cond->ack_sem);
 144
 145     return 0;
 146 }
 147
 148 static av_always_inline int pthread_cond_signal(pthread_cond_t *cond)
 149 {
 150     if (!__atomic_cmpxchg32(&cond->wait_count, 0, 0)) {
 151         DosPostEventSem(cond->event_sem);
 152         DosWaitEventSem(cond->ack_sem, SEM_INDEFINITE_WAIT);
 153     }
 154
 155     return 0;
 156 }
 157
 158 static av_always_inline int pthread_cond_broadcast(pthread_cond_t *cond)
 159 {
 160     while (!__atomic_cmpxchg32(&cond->wait_count, 0, 0))
 161         pthread_cond_signal(cond);
 162
 163     return 0;
 164 }
 165
 166 static av_always_inline int pthread_cond_wait(pthread_cond_t *cond,
 167                                               pthread_mutex_t *mutex)
 168 {
 169     __atomic_increment(&cond->wait_count);
 170
 171     pthread_mutex_unlock(mutex);
 172
 173     DosWaitEventSem(cond->event_sem, SEM_INDEFINITE_WAIT);
 174
 175     __atomic_decrement(&cond->wait_count);
 176
 177     DosPostEventSem(cond->ack_sem);
 178
 179     pthread_mutex_lock(mutex);
 180
 181     return 0;
 182 }
 183
 184 static av_always_inline int pthread_once(pthread_once_t *once_control,
 185                                          void (*init_routine)(void))
 186 {
 187     if (!once_control->done)
 188     {
 189         _fmutex_request(&once_control->mtx, 0);
 190
 191         if (!once_control->done)
 192         {
 193             init_routine();
 194
 195             once_control->done = 1;
 196         }
 197
 198         _fmutex_release(&once_control->mtx);
 199     }
 200
 201     return 0;
 202 }
 203 #endif /* COMPAT_OS2THREADS_H */