git.sesse.net Git - ffmpeg/blob - compat/os2threads.h

   1 /*
   2  * Copyright (c) 2011 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 HMTX pthread_mutex_t;
  50 typedef void pthread_mutexattr_t;
  51
  52 typedef struct {
  53     HEV event_sem;
  54     HEV ack_sem;
  55     volatile unsigned  wait_count;
  56 } pthread_cond_t;
  57
  58 typedef void pthread_condattr_t;
  59
  60 typedef struct {
  61     volatile int done;
  62     _fmutex mtx;
  63 } pthread_once_t;
  64
  65 #define PTHREAD_ONCE_INIT {0, _FMUTEX_INITIALIZER}
  66
  67 static void thread_entry(void *arg)
  68 {
  69     pthread_t *thread = arg;
  70
  71     thread->result = thread->start_routine(thread->arg);
  72 }
  73
  74 static av_always_inline int pthread_create(pthread_t *thread,
  75                                            const pthread_attr_t *attr,
  76                                            void *(*start_routine)(void*),
  77                                            void *arg)
  78 {
  79     thread->start_routine = start_routine;
  80     thread->arg = arg;
  81     thread->result = NULL;
  82
  83     thread->tid = _beginthread(thread_entry, NULL, 1024 * 1024, thread);
  84
  85     return 0;
  86 }
  87
  88 static av_always_inline int pthread_join(pthread_t thread, void **value_ptr)
  89 {
  90     DosWaitThread(&thread.tid, DCWW_WAIT);
  91
  92     if (value_ptr)
  93         *value_ptr = thread.result;
  94
  95     return 0;
  96 }
  97
  98 static av_always_inline int pthread_mutex_init(pthread_mutex_t *mutex,
  99                                                const pthread_mutexattr_t *attr)
 100 {
 101     DosCreateMutexSem(NULL, (PHMTX)mutex, 0, FALSE);
 102
 103     return 0;
 104 }
 105
 106 static av_always_inline int pthread_mutex_destroy(pthread_mutex_t *mutex)
 107 {
 108     DosCloseMutexSem(*(PHMTX)mutex);
 109
 110     return 0;
 111 }
 112
 113 static av_always_inline int pthread_mutex_lock(pthread_mutex_t *mutex)
 114 {
 115     DosRequestMutexSem(*(PHMTX)mutex, SEM_INDEFINITE_WAIT);
 116
 117     return 0;
 118 }
 119
 120 static av_always_inline int pthread_mutex_unlock(pthread_mutex_t *mutex)
 121 {
 122     DosReleaseMutexSem(*(PHMTX)mutex);
 123
 124     return 0;
 125 }
 126
 127 static av_always_inline int pthread_cond_init(pthread_cond_t *cond,
 128                                               const pthread_condattr_t *attr)
 129 {
 130     DosCreateEventSem(NULL, &cond->event_sem, DCE_POSTONE, FALSE);
 131     DosCreateEventSem(NULL, &cond->ack_sem, DCE_POSTONE, FALSE);
 132
 133     cond->wait_count = 0;
 134
 135     return 0;
 136 }
 137
 138 static av_always_inline int pthread_cond_destroy(pthread_cond_t *cond)
 139 {
 140     DosCloseEventSem(cond->event_sem);
 141     DosCloseEventSem(cond->ack_sem);
 142
 143     return 0;
 144 }
 145
 146 static av_always_inline int pthread_cond_signal(pthread_cond_t *cond)
 147 {
 148     if (!__atomic_cmpxchg32(&cond->wait_count, 0, 0)) {
 149         DosPostEventSem(cond->event_sem);
 150         DosWaitEventSem(cond->ack_sem, SEM_INDEFINITE_WAIT);
 151     }
 152
 153     return 0;
 154 }
 155
 156 static av_always_inline int pthread_cond_broadcast(pthread_cond_t *cond)
 157 {
 158     while (!__atomic_cmpxchg32(&cond->wait_count, 0, 0))
 159         pthread_cond_signal(cond);
 160
 161     return 0;
 162 }
 163
 164 static av_always_inline int pthread_cond_wait(pthread_cond_t *cond,
 165                                               pthread_mutex_t *mutex)
 166 {
 167     __atomic_increment(&cond->wait_count);
 168
 169     pthread_mutex_unlock(mutex);
 170
 171     DosWaitEventSem(cond->event_sem, SEM_INDEFINITE_WAIT);
 172
 173     __atomic_decrement(&cond->wait_count);
 174
 175     DosPostEventSem(cond->ack_sem);
 176
 177     pthread_mutex_lock(mutex);
 178
 179     return 0;
 180 }
 181
 182 static av_always_inline int pthread_once(pthread_once_t *once_control,
 183                                          void (*init_routine)(void))
 184 {
 185     if (!once_control->done)
 186     {
 187         _fmutex_request(&once_control->mtx, 0);
 188
 189         if (!once_control->done)
 190         {
 191             init_routine();
 192
 193             once_control->done = 1;
 194         }
 195
 196         _fmutex_release(&once_control->mtx);
 197     }
 198
 199     return 0;
 200 }
 201 #endif /* COMPAT_OS2THREADS_H */