mirror of
https://code.videolan.org/videolan/vlc
synced 2024-09-04 09:11:33 +02:00
![Jean-Marc Dressler](/assets/img/avatar_default.png)
bit stream, la macro pour la conversion de BIGENDIAN vers LITTLEENDIAN ne fonctionnant (toujours) pas. La version BeOS pose encore de gros probl�mes: - des plantages al�atoires lorsqu'on utilise le son, - des performances tr�s en dessous de celles d'anciennes version du vlc, - une synchro son qui ne fonctionne pas correctement, - au bout d'un certain temps d'utilisation, toutes les ressources syst�mes sont consomm�es et le syst�me lui-m�me devient instable (merci d'�viter les commentaires sur la stabilit� de BeOS)
472 lines
14 KiB
C
472 lines
14 KiB
C
/*****************************************************************************
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* threads.h : threads implementation for the VideoLAN client
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* This header provides a portable threads implementation.
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*****************************************************************************
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* Copyright (C) 1999, 2000 VideoLAN
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*
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* Authors: Jean-Marc Dressler <polux@via.ecp.fr>
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* Samuel Hocevar <sam@via.ecp.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*****************************************************************************/
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#include <stdio.h>
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#if defined(HAVE_PTHREAD_H) /* pthreads (Linux & BSD for example) */
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#include <pthread.h>
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#elif defined(HAVE_CTHREADS_H) /* GNUMach */
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#include <cthreads.h>
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#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H) /* BeOS */
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#undef MAX
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#undef MIN
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#include <kernel/OS.h>
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#include <kernel/scheduler.h>
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#include <byteorder.h>
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#else
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#error no threads available on your system !
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#endif
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/*****************************************************************************
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* Constants
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*****************************************************************************
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* These constants are used by all threads in *_CreateThread() and
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* *_DestroyThreads() functions. Since those calls are non-blocking, an integer
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* value is used as a shared flag to represent the status of the thread.
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*****************************************************************************/
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/* Void status - this value can be used to make sure no operation is currently
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* in progress on the concerned thread in an array of recorded threads */
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#define THREAD_NOP 0 /* nothing happened */
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/* Creation status */
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#define THREAD_CREATE 10 /* thread is initializing */
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#define THREAD_START 11 /* thread has forked */
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#define THREAD_READY 19 /* thread is ready */
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/* Destructions status */
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#define THREAD_DESTROY 20 /* destruction order has been sent */
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#define THREAD_END 21 /* destruction order has been received */
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#define THREAD_OVER 29 /* thread does not exist any more */
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/* Error status */
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#define THREAD_ERROR 30 /* an error occured */
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#define THREAD_FATAL 31 /* an fatal error occured - program must end */
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/*****************************************************************************
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* Types definition
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*****************************************************************************/
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#if defined(HAVE_CTHREADS_H)
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typedef cthread_t vlc_thread_t;
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/* those structs are the ones defined in /include/cthreads.h but we need
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* to handle (*foo) where foo is a (mutex_t) while they handle (foo) where
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* foo is a (mutex_t*) */
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typedef struct s_mutex {
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spin_lock_t held;
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spin_lock_t lock;
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char *name;
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struct cthread_queue queue;
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} vlc_mutex_t;
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typedef struct s_condition {
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spin_lock_t lock;
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struct cthread_queue queue;
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char *name;
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struct cond_imp *implications;
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} vlc_cond_t;
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#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
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typedef thread_id vlc_thread_t;
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typedef struct
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{
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int32 init;
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sem_id lock;
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thread_id owner;
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} vlc_mutex_t;
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typedef struct
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{
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int32 init;
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sem_id sem;
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sem_id handshakeSem;
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sem_id signalSem;
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volatile int32 nw;
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volatile int32 ns;
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} vlc_cond_t;
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#elif defined(HAVE_PTHREAD_H)
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typedef pthread_t vlc_thread_t;
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typedef pthread_mutex_t vlc_mutex_t;
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typedef pthread_cond_t vlc_cond_t;
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#endif
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typedef void *(*vlc_thread_func_t)(void *p_data);
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/*****************************************************************************
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* Prototypes
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*****************************************************************************/
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static __inline__ int vlc_thread_create( vlc_thread_t *p_thread, char *psz_name,
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vlc_thread_func_t func, void *p_data );
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static __inline__ void vlc_thread_exit ( void );
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static __inline__ void vlc_thread_join ( vlc_thread_t thread );
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static __inline__ int vlc_mutex_init ( vlc_mutex_t *p_mutex );
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static __inline__ int vlc_mutex_lock ( vlc_mutex_t *p_mutex );
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static __inline__ int vlc_mutex_unlock ( vlc_mutex_t *p_mutex );
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static __inline__ int vlc_cond_init ( vlc_cond_t *p_condvar );
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static __inline__ int vlc_cond_signal ( vlc_cond_t *p_condvar );
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static __inline__ int vlc_cond_wait ( vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex );
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#if 0
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static _inline__ int vlc_cond_timedwait ( vlc_cond_t * condvar, vlc_mutex_t * mutex,
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mtime_t absoute_timeout_time );
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#endif
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/*****************************************************************************
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* vlc_thread_create: create a thread
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*****************************************************************************/
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static __inline__ int vlc_thread_create( vlc_thread_t *p_thread,
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char *psz_name, vlc_thread_func_t func,
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void *p_data)
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{
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#if defined(HAVE_CTHREADS_H)
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*p_thread = cthread_fork( (cthread_fn_t)func, (any_t)p_data );
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return 0;
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#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
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*p_thread = spawn_thread( (thread_func)func, psz_name,
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B_NORMAL_PRIORITY, p_data );
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return resume_thread( *p_thread );
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#elif defined(HAVE_PTHREAD_H)
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return pthread_create( p_thread, NULL, func, p_data );
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#endif
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}
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/*****************************************************************************
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* vlc_thread_exit: terminate a thread
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*****************************************************************************/
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static __inline__ void vlc_thread_exit( void )
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{
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#if defined(HAVE_CTHREADS_H)
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int result;
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cthread_exit( &result );
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#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
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exit_thread( 0 );
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#elif defined(HAVE_PTHREAD_H)
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pthread_exit( 0 );
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#endif
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}
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/*****************************************************************************
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* vlc_thread_join: wait until a thread exits
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*****************************************************************************/
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static __inline__ void vlc_thread_join( vlc_thread_t thread )
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{
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#if defined(HAVE_CTHREADS_H)
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cthread_join( thread );
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#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
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int32 exit_value;
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wait_for_thread( thread, &exit_value );
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#elif defined(HAVE_PTHREAD_H)
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pthread_join( thread, NULL );
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#endif
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}
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/*****************************************************************************
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* vlc_mutex_init: initialize a mutex
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*****************************************************************************/
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static __inline__ int vlc_mutex_init( vlc_mutex_t *p_mutex )
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{
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#if defined(HAVE_CTHREADS_H)
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mutex_init( p_mutex );
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return 0;
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#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
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/*
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// check the arguments and whether it's already been initialized
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if( !p_mutex ) return B_BAD_VALUE;
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if( p_mutex->init == 9999 ) return EALREADY;
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*/
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p_mutex->lock = create_sem( 1, "BeMutex" );
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p_mutex->owner = -1;
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p_mutex->init = 9999;
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return B_OK;
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#elif defined(HAVE_PTHREAD_H)
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return pthread_mutex_init( p_mutex, NULL );
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#endif
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}
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#if defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
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/* lazy_init_mutex */
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static __inline__ void lazy_init_mutex(vlc_mutex_t* p_mutex)
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{
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int32 v = atomic_or( &p_mutex->init, 1 );
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if( 2000 == v ) /* we're the first, so do the init */
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{
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vlc_mutex_init( p_mutex );
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}
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else /* we're not the first, so wait until the init is finished */
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{
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while( p_mutex->init != 9999 )
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{
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snooze( 10000 );
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}
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}
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}
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#endif
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/*****************************************************************************
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* vlc_mutex_lock: lock a mutex
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*****************************************************************************/
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static __inline__ int vlc_mutex_lock( vlc_mutex_t *p_mutex )
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{
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#if defined(HAVE_CTHREADS_H)
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mutex_lock( p_mutex );
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return 0;
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#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
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status_t err;
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/*
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if( !p_mutex ) return B_BAD_VALUE;
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if( p_mutex->init < 2000 ) return B_NO_INIT;
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lazy_init_mutex( p_mutex );
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*/
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err = acquire_sem( p_mutex->lock );
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/*
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if( !err ) p_mutex->owner = find_thread( NULL );
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*/
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return err;
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#elif defined(HAVE_PTHREAD_H)
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return pthread_mutex_lock( p_mutex );
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#endif
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}
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/*****************************************************************************
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* vlc_mutex_unlock: unlock a mutex
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*****************************************************************************/
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static __inline__ int vlc_mutex_unlock( vlc_mutex_t *p_mutex )
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{
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#if defined(HAVE_CTHREADS_H)
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mutex_unlock( p_mutex );
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return 0;
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#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
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/*
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if(! p_mutex) return B_BAD_VALUE;
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if( p_mutex->init < 2000 ) return B_NO_INIT;
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lazy_init_mutex( p_mutex );
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if( p_mutex->owner != find_thread(NULL) )
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return ENOLCK;
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p_mutex->owner = -1;
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*/
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release_sem( p_mutex->lock );
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return B_OK;
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#elif defined(HAVE_PTHREAD_H)
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return pthread_mutex_unlock( p_mutex );
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#endif
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}
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/*****************************************************************************
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* vlc_cond_init: initialize a condition
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*****************************************************************************/
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static __inline__ int vlc_cond_init( vlc_cond_t *p_condvar )
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{
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#if defined(HAVE_CTHREADS_H)
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/* condition_init() */
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spin_lock_init( &p_condvar->lock );
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cthread_queue_init( &p_condvar->queue );
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p_condvar->name = 0;
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p_condvar->implications = 0;
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return 0;
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#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
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if( !p_condvar )
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return B_BAD_VALUE;
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if( p_condvar->init == 9999 )
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return EALREADY;
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p_condvar->sem = create_sem( 0, "CVSem" );
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p_condvar->handshakeSem = create_sem( 0, "CVHandshake" );
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p_condvar->signalSem = create_sem( 1, "CVSignal" );
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p_condvar->ns = p_condvar->nw = 0;
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p_condvar->init = 9999;
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return B_OK;
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#elif defined(HAVE_PTHREAD_H)
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return pthread_cond_init( p_condvar, NULL );
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#endif
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}
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#if defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
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/* lazy_init_cond */
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static __inline__ void lazy_init_cond( vlc_cond_t* p_condvar )
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{
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int32 v = atomic_or( &p_condvar->init, 1 );
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if( 2000 == v ) /* we're the first, so do the init */
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{
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vlc_cond_init( p_condvar );
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}
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else /* we're not the first, so wait until the init is finished */
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{
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while( p_condvar->init != 9999 )
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{
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snooze( 10000 );
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}
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}
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}
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#endif
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/*****************************************************************************
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* vlc_cond_signal: start a thread on condition completion
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*****************************************************************************/
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static __inline__ int vlc_cond_signal( vlc_cond_t *p_condvar )
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{
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#if defined(HAVE_CTHREADS_H)
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/* condition_signal() */
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if ( p_condvar->queue.head || p_condvar->implications )
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{
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cond_signal( (condition_t)p_condvar );
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}
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return 0;
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#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
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status_t err = B_OK;
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if( !p_condvar )
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return B_BAD_VALUE;
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if( p_condvar->init < 2000 )
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return B_NO_INIT;
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lazy_init_cond( p_condvar );
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if( acquire_sem(p_condvar->signalSem) == B_INTERRUPTED)
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return B_INTERRUPTED;
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if( p_condvar->nw > p_condvar->ns )
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{
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p_condvar->ns += 1;
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release_sem( p_condvar->sem );
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release_sem( p_condvar->signalSem );
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while( acquire_sem(p_condvar->handshakeSem) == B_INTERRUPTED )
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{
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err = B_INTERRUPTED;
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}
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}
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else
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{
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release_sem( p_condvar->signalSem );
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}
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return err;
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#elif defined(HAVE_PTHREAD_H)
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return pthread_cond_signal( p_condvar );
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#endif
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}
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/*****************************************************************************
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* vlc_cond_wait: wait until condition completion
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*****************************************************************************/
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static __inline__ int vlc_cond_wait( vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex )
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{
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#if defined(HAVE_CTHREADS_H)
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condition_wait( (condition_t)p_condvar, (mutex_t)p_mutex );
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return 0;
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#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
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status_t err;
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if( !p_condvar )
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return B_BAD_VALUE;
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if( !p_mutex )
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return B_BAD_VALUE;
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if( p_condvar->init < 2000 )
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return B_NO_INIT;
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lazy_init_cond( p_condvar );
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if( acquire_sem(p_condvar->signalSem) == B_INTERRUPTED )
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return B_INTERRUPTED;
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p_condvar->nw += 1;
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release_sem( p_condvar->signalSem );
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vlc_mutex_unlock( p_mutex );
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err = acquire_sem( p_condvar->sem );
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while( acquire_sem(p_condvar->signalSem) == B_INTERRUPTED)
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{
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err = B_INTERRUPTED;
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}
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if( p_condvar->ns > 0 )
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{
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release_sem( p_condvar->handshakeSem );
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p_condvar->ns -= 1;
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}
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p_condvar->nw -= 1;
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release_sem( p_condvar->signalSem );
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while( vlc_mutex_lock(p_mutex) == B_INTERRUPTED)
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{
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err = B_INTERRUPTED;
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}
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return err;
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#elif defined(HAVE_PTHREAD_H)
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return pthread_cond_wait( p_condvar, p_mutex );
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#endif
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}
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