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vlc/include/threads.h
Sam Hocevar 4f551c2bf0 * Header cleaning: filled all empty authors fields, added CVS $Id stuff. 
* Fixes to aout_darwin.c by Colin Delacroix <colin@zoy.org>.
  * Fixes to configure.in, Makefile.in and main.c (Altivec detection)
    by Eugenio Jarosiewicz <ej0@cise.ufl.edu>.
  * Added Colin and Eugenio to the AUTHORS file.
2001-03-21 13:42:35 +00:00

426 lines
14 KiB
C
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/*****************************************************************************
* threads.h : threads implementation for the VideoLAN client
* This header provides a portable threads implementation.
*****************************************************************************
* Copyright (C) 1999, 2000 VideoLAN
* $Id: threads.h,v 1.16 2001/03/21 13:42:33 sam Exp $
*
* Authors: Jean-Marc Dressler <polux@via.ecp.fr>
* Samuel Hocevar <sam@via.ecp.fr>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
#include <stdio.h>
#if defined(HAVE_PTHREAD_H) /* pthreads (Linux & BSD for example) */
#include <pthread.h>
#elif defined(HAVE_CTHREADS_H) /* GNUMach */
#include <cthreads.h>
#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H) /* BeOS */
#undef MAX
#undef MIN
#include <kernel/OS.h>
#include <kernel/scheduler.h>
#include <byteorder.h>
#else
#error no threads available on your system !
#endif
/*****************************************************************************
* Constants
*****************************************************************************
* These constants are used by all threads in *_CreateThread() and
* *_DestroyThreads() functions. Since those calls are non-blocking, an integer
* value is used as a shared flag to represent the status of the thread.
*****************************************************************************/
/* Void status - this value can be used to make sure no operation is currently
* in progress on the concerned thread in an array of recorded threads */
#define THREAD_NOP 0 /* nothing happened */
/* Creation status */
#define THREAD_CREATE 10 /* thread is initializing */
#define THREAD_START 11 /* thread has forked */
#define THREAD_READY 19 /* thread is ready */
/* Destructions status */
#define THREAD_DESTROY 20 /* destruction order has been sent */
#define THREAD_END 21 /* destruction order has been received */
#define THREAD_OVER 29 /* thread does not exist any more */
/* Error status */
#define THREAD_ERROR 30 /* an error occured */
#define THREAD_FATAL 31 /* an fatal error occured - program must end */
/*****************************************************************************
* Types definition
*****************************************************************************/
#if defined(HAVE_PTHREAD_H)
typedef pthread_t vlc_thread_t;
typedef pthread_mutex_t vlc_mutex_t;
typedef pthread_cond_t vlc_cond_t;
#elif defined(HAVE_CTHREADS_H)
typedef cthread_t vlc_thread_t;
/* those structs are the ones defined in /include/cthreads.h but we need
* to handle (*foo) where foo is a (mutex_t) while they handle (foo) where
* foo is a (mutex_t*) */
typedef struct s_mutex {
spin_lock_t held;
spin_lock_t lock;
char *name;
struct cthread_queue queue;
} vlc_mutex_t;
typedef struct s_condition {
spin_lock_t lock;
struct cthread_queue queue;
char *name;
struct cond_imp *implications;
} vlc_cond_t;
#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
/* This is the BeOS implementation of the vlc thread, note that the mutex is
* not a real mutex and the cond_var is not like a pthread cond_var but it is
* enough for what wee need */
typedef thread_id vlc_thread_t;
typedef struct
{
int32 init;
sem_id lock;
} vlc_mutex_t;
typedef struct
{
int32 init;
thread_id thread;
} vlc_cond_t;
#endif
typedef void *(*vlc_thread_func_t)(void *p_data);
/*****************************************************************************
* Prototypes
*****************************************************************************/
static __inline__ int vlc_thread_create( vlc_thread_t *p_thread, char *psz_name,
vlc_thread_func_t func, void *p_data );
static __inline__ void vlc_thread_exit ( void );
static __inline__ void vlc_thread_join ( vlc_thread_t thread );
static __inline__ int vlc_mutex_init ( vlc_mutex_t *p_mutex );
static __inline__ int vlc_mutex_lock ( vlc_mutex_t *p_mutex );
static __inline__ int vlc_mutex_unlock ( vlc_mutex_t *p_mutex );
static __inline__ int vlc_mutex_destroy ( vlc_mutex_t *p_mutex );
static __inline__ int vlc_cond_init ( vlc_cond_t *p_condvar );
static __inline__ int vlc_cond_signal ( vlc_cond_t *p_condvar );
static __inline__ int vlc_cond_wait ( vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex );
static __inline__ int vlc_cond_destroy ( vlc_cond_t *p_condvar );
#if 0
static _inline__ int vlc_cond_timedwait ( vlc_cond_t * condvar, vlc_mutex_t * mutex,
mtime_t absoute_timeout_time );
#endif
/*****************************************************************************
* vlc_thread_create: create a thread
*****************************************************************************/
static __inline__ int vlc_thread_create( vlc_thread_t *p_thread,
char *psz_name, vlc_thread_func_t func,
void *p_data)
{
#if defined(HAVE_PTHREAD_H)
return pthread_create( p_thread, NULL, func, p_data );
#elif defined(HAVE_CTHREADS_H)
*p_thread = cthread_fork( (cthread_fn_t)func, (any_t)p_data );
return 0;
#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
*p_thread = spawn_thread( (thread_func)func, psz_name,
B_NORMAL_PRIORITY, p_data );
return resume_thread( *p_thread );
#endif
}
/*****************************************************************************
* vlc_thread_exit: terminate a thread
*****************************************************************************/
static __inline__ void vlc_thread_exit( void )
{
#if defined(HAVE_PTHREAD_H)
pthread_exit( 0 );
#elif defined(HAVE_CTHREADS_H)
int result;
cthread_exit( &result );
#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
exit_thread( 0 );
#endif
}
/*****************************************************************************
* vlc_thread_join: wait until a thread exits
*****************************************************************************/
static __inline__ void vlc_thread_join( vlc_thread_t thread )
{
#if defined(HAVE_PTHREAD_H)
pthread_join( thread, NULL );
#elif defined(HAVE_CTHREADS_H)
cthread_join( thread );
#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
int32 exit_value;
wait_for_thread( thread, &exit_value );
#endif
}
/*****************************************************************************
* vlc_mutex_init: initialize a mutex
*****************************************************************************/
static __inline__ int vlc_mutex_init( vlc_mutex_t *p_mutex )
{
#if defined(HAVE_PTHREAD_H)
return pthread_mutex_init( p_mutex, NULL );
#elif defined(HAVE_CTHREADS_H)
mutex_init( p_mutex );
return 0;
#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
/* check the arguments and whether it's already been initialized */
if( p_mutex == NULL ) return B_BAD_VALUE;
if( p_mutex->init == 9999 )
{
return EALREADY;
}
p_mutex->lock = create_sem( 1, "BeMutex" );
if( p_mutex->lock < B_NO_ERROR )
return( -1 );
p_mutex->init = 9999;
return B_OK;
#endif
}
/*****************************************************************************
* vlc_mutex_lock: lock a mutex
*****************************************************************************/
static __inline__ int vlc_mutex_lock( vlc_mutex_t *p_mutex )
{
#if defined(HAVE_PTHREAD_H)
return pthread_mutex_lock( p_mutex );
#elif defined(HAVE_CTHREADS_H)
mutex_lock( p_mutex );
return 0;
#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
status_t err;
if( !p_mutex ) return B_BAD_VALUE;
if( p_mutex->init < 2000 ) return B_NO_INIT;
err = acquire_sem( p_mutex->lock );
return err;
#endif
}
/*****************************************************************************
* vlc_mutex_unlock: unlock a mutex
*****************************************************************************/
static __inline__ int vlc_mutex_unlock( vlc_mutex_t *p_mutex )
{
#if defined(HAVE_PTHREAD_H)
return pthread_mutex_unlock( p_mutex );
#elif defined(HAVE_CTHREADS_H)
mutex_unlock( p_mutex );
return 0;
#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
if(! p_mutex) return B_BAD_VALUE;
if( p_mutex->init < 2000 ) return B_NO_INIT;
release_sem( p_mutex->lock );
return B_OK;
#endif
}
/*****************************************************************************
* vlc_mutex_destroy: destroy a mutex
*****************************************************************************/
static __inline__ int vlc_mutex_destroy( vlc_mutex_t *p_mutex )
{
#if defined(HAVE_PTHREAD_H)
return pthread_mutex_destroy( p_mutex );
#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
if( p_mutex->init == 9999 )
delete_sem( p_mutex->lock );
p_mutex->init = 0;
return B_OK;
#endif
}
/*****************************************************************************
* vlc_cond_init: initialize a condition
*****************************************************************************/
static __inline__ int vlc_cond_init( vlc_cond_t *p_condvar )
{
#if defined(HAVE_PTHREAD_H)
return pthread_cond_init( p_condvar, NULL );
#elif defined(HAVE_CTHREADS_H)
/* condition_init() */
spin_lock_init( &p_condvar->lock );
cthread_queue_init( &p_condvar->queue );
p_condvar->name = 0;
p_condvar->implications = 0;
return 0;
#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
if( !p_condvar )
return B_BAD_VALUE;
if( p_condvar->init == 9999 )
return EALREADY;
p_condvar->thread = -1;
p_condvar->init = 9999;
return 0;
#endif
}
/*****************************************************************************
* vlc_cond_signal: start a thread on condition completion
*****************************************************************************/
static __inline__ int vlc_cond_signal( vlc_cond_t *p_condvar )
{
#if defined(HAVE_PTHREAD_H)
return pthread_cond_signal( p_condvar );
#elif defined(HAVE_CTHREADS_H)
/* condition_signal() */
if ( p_condvar->queue.head || p_condvar->implications )
{
cond_signal( (condition_t)p_condvar );
}
return 0;
#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
if( !p_condvar )
return B_BAD_VALUE;
if( p_condvar->init < 2000 )
return B_NO_INIT;
while( p_condvar->thread != -1 )
{
thread_info info;
if( get_thread_info(p_condvar->thread, &info) == B_BAD_VALUE )
return 0;
if( info.state != B_THREAD_SUSPENDED )
{
// The waiting thread is not suspended so it could
// have been interrupted beetwen the unlock and the
// suspend_thread line. That is why we sleep a little
// before retesting p_condver->thread.
snooze( 10000 );
}
else
{
// Ok, we have to wake up that thread
resume_thread( p_condvar->thread );
return 0;
}
}
return 0;
#endif
}
/*****************************************************************************
* vlc_cond_wait: wait until condition completion
*****************************************************************************/
static __inline__ int vlc_cond_wait( vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex )
{
#if defined(HAVE_PTHREAD_H)
return pthread_cond_wait( p_condvar, p_mutex );
#elif defined(HAVE_CTHREADS_H)
condition_wait( (condition_t)p_condvar, (mutex_t)p_mutex );
return 0;
#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
if( !p_condvar )
return B_BAD_VALUE;
if( !p_mutex )
return B_BAD_VALUE;
if( p_condvar->init < 2000 )
return B_NO_INIT;
// The p_condvar->thread var is initialized before the unlock because
// it enables to identify when the thread is interrupted beetwen the
// unlock line and the suspend_thread line
p_condvar->thread = find_thread( NULL );
vlc_mutex_unlock( p_mutex );
suspend_thread( p_condvar->thread );
p_condvar->thread = -1;
vlc_mutex_lock( p_mutex );
return 0;
#endif
}
/*****************************************************************************
* vlc_cond_destroy: destroy a condition
*****************************************************************************/
static __inline__ int vlc_cond_destroy( vlc_cond_t *p_condvar )
{
#if defined(HAVE_PTHREAD_H)
return pthread_cond_destroy( p_condvar );
#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
p_condvar->init = 0;
return 0;
#endif
}
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