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/*
* Copyright (c) 2011-2017 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 COMPAT_OS2THREADS_H
#define COMPAT_OS2THREADS_H
#define INCL_DOS
#include <os2.h>
#undef __STRICT_ANSI__ /* for _beginthread() */
#include <stdlib.h>
#include <time.h>
#include <sys/builtin.h>
#include <sys/fmutex.h>
#include "libavutil/attributes.h"
#include "libavutil/common.h"
#include "libavutil/time.h"
typedef struct {
TID tid;
void *(*start_routine)(void *);
void *arg;
void *result;
} pthread_t;
typedef void pthread_attr_t;
typedef _fmutex pthread_mutex_t;
typedef void pthread_mutexattr_t;
#define PTHREAD_MUTEX_INITIALIZER _FMUTEX_INITIALIZER
typedef struct {
HEV event_sem;
HEV ack_sem;
volatile unsigned wait_count;
} pthread_cond_t;
typedef void pthread_condattr_t;
typedef struct {
volatile int done;
_fmutex mtx;
} pthread_once_t;
#define PTHREAD_ONCE_INIT {0, _FMUTEX_INITIALIZER}
static void thread_entry(void *arg)
{
pthread_t *thread = arg;
thread->result = thread->start_routine(thread->arg);
}
static av_always_inline int pthread_create(pthread_t *thread,
const pthread_attr_t *attr,
void *(*start_routine)(void*),
void *arg)
{
thread->start_routine = start_routine;
thread->arg = arg;
thread->result = NULL;
thread->tid = _beginthread(thread_entry, NULL, 1024 * 1024, thread);
return 0;
}
static av_always_inline int pthread_join(pthread_t thread, void **value_ptr)
{
DosWaitThread(&thread.tid, DCWW_WAIT);
if (value_ptr)
*value_ptr = thread.result;
return 0;
}
static av_always_inline int pthread_mutex_init(pthread_mutex_t *mutex,
const pthread_mutexattr_t *attr)
{
_fmutex_create(mutex, 0);
return 0;
}
static av_always_inline int pthread_mutex_destroy(pthread_mutex_t *mutex)
{
_fmutex_close(mutex);
return 0;
}
static av_always_inline int pthread_mutex_lock(pthread_mutex_t *mutex)
{
_fmutex_request(mutex, 0);
return 0;
}
static av_always_inline int pthread_mutex_unlock(pthread_mutex_t *mutex)
{
_fmutex_release(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);
DosCreateEventSem(NULL, &cond->ack_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);
DosCloseEventSem(cond->ack_sem);
return 0;
}
static av_always_inline int pthread_cond_signal(pthread_cond_t *cond)
{
if (!__atomic_cmpxchg32(&cond->wait_count, 0, 0)) {
DosPostEventSem(cond->event_sem);
DosWaitEventSem(cond->ack_sem, SEM_INDEFINITE_WAIT);
}
return 0;
}
static av_always_inline int pthread_cond_broadcast(pthread_cond_t *cond)
{
while (!__atomic_cmpxchg32(&cond->wait_count, 0, 0))
pthread_cond_signal(cond);
return 0;
}
static av_always_inline int pthread_cond_timedwait(pthread_cond_t *cond,
pthread_mutex_t *mutex,
const struct timespec *abstime)
{
int64_t abs_milli = abstime->tv_sec * 1000LL + abstime->tv_nsec / 1000000;
ULONG t = av_clip64(abs_milli - av_gettime() / 1000, 0, ULONG_MAX);
__atomic_increment(&cond->wait_count);
pthread_mutex_unlock(mutex);
APIRET ret = DosWaitEventSem(cond->event_sem, t);
__atomic_decrement(&cond->wait_count);
DosPostEventSem(cond->ack_sem);
pthread_mutex_lock(mutex);
return (ret == ERROR_TIMEOUT) ? ETIMEDOUT : 0;
}
static av_always_inline int pthread_cond_wait(pthread_cond_t *cond,
pthread_mutex_t *mutex)
{
__atomic_increment(&cond->wait_count);
pthread_mutex_unlock(mutex);
DosWaitEventSem(cond->event_sem, SEM_INDEFINITE_WAIT);
__atomic_decrement(&cond->wait_count);
DosPostEventSem(cond->ack_sem);
pthread_mutex_lock(mutex);
return 0;
}
static av_always_inline int pthread_once(pthread_once_t *once_control,
void (*init_routine)(void))
{
if (!once_control->done)
{
_fmutex_request(&once_control->mtx, 0);
if (!once_control->done)
{
init_routine();
once_control->done = 1;
}
_fmutex_release(&once_control->mtx);
}
return 0;
}
#endif /* COMPAT_OS2THREADS_H */
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