mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
b8bc6b14a5
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
202 lines
4.7 KiB
C
202 lines
4.7 KiB
C
/*
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* Copyright (c) 2011 KO Myung-Hun <komh@chollian.net>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* os2threads to pthreads wrapper
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*/
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#ifndef COMPAT_OS2THREADS_H
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#define COMPAT_OS2THREADS_H
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#define INCL_DOS
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#include <os2.h>
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#undef __STRICT_ANSI__ /* for _beginthread() */
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#include <stdlib.h>
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#include <sys/builtin.h>
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#include <sys/fmutex.h>
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#include "libavutil/attributes.h"
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typedef struct {
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TID tid;
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void *(*start_routine)(void *);
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void *arg;
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void *result;
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} pthread_t;
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typedef void pthread_attr_t;
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typedef HMTX pthread_mutex_t;
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typedef void pthread_mutexattr_t;
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typedef struct {
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HEV event_sem;
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HEV ack_sem;
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volatile unsigned wait_count;
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} pthread_cond_t;
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typedef void pthread_condattr_t;
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typedef struct {
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volatile int done;
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_fmutex mtx;
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} pthread_once_t;
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#define PTHREAD_ONCE_INIT {0, _FMUTEX_INITIALIZER}
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static void thread_entry(void *arg)
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{
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pthread_t *thread = arg;
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thread->result = thread->start_routine(thread->arg);
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}
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static av_always_inline int pthread_create(pthread_t *thread,
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const pthread_attr_t *attr,
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void *(*start_routine)(void*),
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void *arg)
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{
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thread->start_routine = start_routine;
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thread->arg = arg;
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thread->result = NULL;
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thread->tid = _beginthread(thread_entry, NULL, 1024 * 1024, thread);
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return 0;
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}
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static av_always_inline int pthread_join(pthread_t thread, void **value_ptr)
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{
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DosWaitThread(&thread.tid, DCWW_WAIT);
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if (value_ptr)
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*value_ptr = thread.result;
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return 0;
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}
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static av_always_inline int pthread_mutex_init(pthread_mutex_t *mutex,
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const pthread_mutexattr_t *attr)
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{
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DosCreateMutexSem(NULL, (PHMTX)mutex, 0, FALSE);
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return 0;
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}
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static av_always_inline int pthread_mutex_destroy(pthread_mutex_t *mutex)
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{
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DosCloseMutexSem(*(PHMTX)mutex);
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return 0;
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}
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static av_always_inline int pthread_mutex_lock(pthread_mutex_t *mutex)
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{
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DosRequestMutexSem(*(PHMTX)mutex, SEM_INDEFINITE_WAIT);
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return 0;
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}
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static av_always_inline int pthread_mutex_unlock(pthread_mutex_t *mutex)
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{
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DosReleaseMutexSem(*(PHMTX)mutex);
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return 0;
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}
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static av_always_inline int pthread_cond_init(pthread_cond_t *cond,
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const pthread_condattr_t *attr)
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{
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DosCreateEventSem(NULL, &cond->event_sem, DCE_POSTONE, FALSE);
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DosCreateEventSem(NULL, &cond->ack_sem, DCE_POSTONE, FALSE);
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cond->wait_count = 0;
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return 0;
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}
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static av_always_inline int pthread_cond_destroy(pthread_cond_t *cond)
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{
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DosCloseEventSem(cond->event_sem);
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DosCloseEventSem(cond->ack_sem);
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return 0;
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}
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static av_always_inline int pthread_cond_signal(pthread_cond_t *cond)
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{
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if (!__atomic_cmpxchg32(&cond->wait_count, 0, 0)) {
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DosPostEventSem(cond->event_sem);
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DosWaitEventSem(cond->ack_sem, SEM_INDEFINITE_WAIT);
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}
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return 0;
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}
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static av_always_inline int pthread_cond_broadcast(pthread_cond_t *cond)
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{
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while (!__atomic_cmpxchg32(&cond->wait_count, 0, 0))
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pthread_cond_signal(cond);
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return 0;
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}
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static av_always_inline int pthread_cond_wait(pthread_cond_t *cond,
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pthread_mutex_t *mutex)
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{
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__atomic_increment(&cond->wait_count);
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pthread_mutex_unlock(mutex);
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DosWaitEventSem(cond->event_sem, SEM_INDEFINITE_WAIT);
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__atomic_decrement(&cond->wait_count);
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DosPostEventSem(cond->ack_sem);
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pthread_mutex_lock(mutex);
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return 0;
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}
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static av_always_inline int pthread_once(pthread_once_t *once_control,
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void (*init_routine)(void))
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{
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if (!once_control->done)
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{
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_fmutex_request(&once_control->mtx, 0);
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if (!once_control->done)
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{
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init_routine();
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once_control->done = 1;
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}
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_fmutex_release(&once_control->mtx);
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}
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return 0;
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}
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#endif /* COMPAT_OS2THREADS_H */
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