/* * 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 COMPAT_OS2THREADS_H #define COMPAT_OS2THREADS_H #define INCL_DOS #include <os2.h> #undef __STRICT_ANSI__ /* for _beginthread() */ #include <stdlib.h> #include <sys/builtin.h> #include <sys/fmutex.h> #include "libavutil/attributes.h" typedef struct { TID tid; void *(*start_routine)(void *); void *arg; void *result; } pthread_t; typedef void pthread_attr_t; typedef HMTX pthread_mutex_t; typedef void pthread_mutexattr_t; 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) { 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); 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_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 */