/*
  * Copyright (c) 2011 KO Myung-Hun <komh@chollian.net>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
  * @file
  * os2threads to pthreads wrapper
  */
 
 #ifndef AVCODEC_OS2PTHREADS_H
 #define AVCODEC_OS2PTHREADS_H
 
 #define INCL_DOS
 #include <os2.h>
 
 #undef __STRICT_ANSI__          /* for _beginthread() */
 #include <stdlib.h>
 

 #include "libavutil/mem.h"
 

 typedef TID  pthread_t;
 typedef void pthread_attr_t;
 
 typedef HMTX pthread_mutex_t;
 typedef void pthread_mutexattr_t;
 
 typedef struct {
     HEV  event_sem;
     int  wait_count;
 } pthread_cond_t;
 
 typedef void pthread_condattr_t;
 
 struct thread_arg {
     void *(*start_routine)(void *);
     void *arg;
 };
 
 static void thread_entry(void *arg)
 {
     struct thread_arg *thread_arg = arg;
 
     thread_arg->start_routine(thread_arg->arg);
 
     av_free(thread_arg);
 }
 
 static av_always_inline int pthread_create(pthread_t *thread, const pthread_attr_t *attr, void *(*start_routine)(void*), void *arg)
 {
     struct thread_arg *thread_arg;
 
     thread_arg = av_mallocz(sizeof(struct thread_arg));
 
     thread_arg->start_routine = start_routine;
     thread_arg->arg = arg;
 
     *thread = _beginthread(thread_entry, NULL, 256 * 1024, thread_arg);
 
     return 0;
 }
 
 static av_always_inline int pthread_join(pthread_t thread, void **value_ptr)
 {
     DosWaitThread((PTID)&thread, DCWW_WAIT);
 
     return 0;
 }
 
 static av_always_inline int pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)
 {
     DosCreateMutexSem(NULL, (PHMTX)mutex, 0, FALSE);
 
     return 0;
 }
 
 static av_always_inline int pthread_mutex_destroy(pthread_mutex_t *mutex)
 {
     DosCloseMutexSem(*(PHMTX)mutex);
 
     return 0;
 }
 
 static av_always_inline int pthread_mutex_lock(pthread_mutex_t *mutex)
 {
     DosRequestMutexSem(*(PHMTX)mutex, SEM_INDEFINITE_WAIT);
 
     return 0;
 }
 
 static av_always_inline int pthread_mutex_unlock(pthread_mutex_t *mutex)
 {
     DosReleaseMutexSem(*(PHMTX)mutex);
 
     return 0;
 }
 
 static av_always_inline int pthread_cond_init(pthread_cond_t *cond, const pthread_condattr_t *attr)
 {
     DosCreateEventSem(NULL, &cond->event_sem, DCE_POSTONE, FALSE);
 
     cond->wait_count = 0;
 
     return 0;
 }
 
 static av_always_inline int pthread_cond_destroy(pthread_cond_t *cond)
 {
     DosCloseEventSem(cond->event_sem);
 
     return 0;
 }
 
 static av_always_inline int pthread_cond_signal(pthread_cond_t *cond)
 {
     if (cond->wait_count > 0) {
         DosPostEventSem(cond->event_sem);
 
         cond->wait_count--;
     }
 
     return 0;
 }
 
 static av_always_inline int pthread_cond_broadcast(pthread_cond_t *cond)
 {
     while (cond->wait_count > 0) {
         DosPostEventSem(cond->event_sem);
 
         cond->wait_count--;
     }
 
     return 0;
 }
 
 static av_always_inline int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
 {
     cond->wait_count++;
 
     pthread_mutex_unlock(mutex);
 
     DosWaitEventSem(cond->event_sem, SEM_INDEFINITE_WAIT);
 
     pthread_mutex_lock(mutex);
 
     return 0;
 }
 
 #endif /* AVCODEC_OS2PTHREADS_H */