/*****************************************************************************
- * threads.h : thread implementation for VideoLAN client
- * This header is supposed to provide a portable threads implementation.
- * Currently, it is a wrapper to either the POSIX pthreads library, or
- * the Mach cthreads (for the GNU/Hurd).
+ * threads.h : threads implementation for the VideoLAN client
+ * This header provides a portable threads implementation.
*****************************************************************************
* Copyright (C) 1999, 2000 VideoLAN
*
- * Authors:
+ * 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.
+ * 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 02111-1307, USA.
+ * 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.
*****************************************************************************/
-#ifdef SYS_GNU
+#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
-#include <pthread.h>
+#error no threads available on your system !
#endif
/*****************************************************************************
* value is used as a shared flag to represent the status of the thread.
*****************************************************************************/
-/* Void status - this value can be used to be sure, in an array of recorded
- * threads, that no operation is currently in progress on the concerned 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 */
* Types definition
*****************************************************************************/
-#ifdef SYS_GNU
+#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 */
+ * 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;
struct cond_imp *implications;
} vlc_cond_t;
-#else /* SYS_GNU */
+#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
-typedef pthread_t vlc_thread_t;
-typedef pthread_mutex_t vlc_mutex_t;
-typedef pthread_cond_t vlc_cond_t;
+/* 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 /* SYS_GNU */
+#endif
typedef void *(*vlc_thread_func_t)(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_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,
char *psz_name, vlc_thread_func_t func,
void *p_data)
{
-#ifdef SYS_GNU
- *p_thread = cthread_fork( (cthread_fn_t)func, (any_t)p_data );
- return( 0 );
-#else
+#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
}
*****************************************************************************/
static __inline__ void vlc_thread_exit( void )
{
-#ifdef SYS_GNU
+#if defined(HAVE_PTHREAD_H)
+ pthread_exit( 0 );
+
+#elif defined(HAVE_CTHREADS_H)
int result;
cthread_exit( &result );
-#else
- pthread_exit( 0 );
+
+#elif defined(HAVE_KERNEL_SCHEDULER_H) && defined(HAVE_KERNEL_OS_H)
+ exit_thread( 0 );
+
#endif
}
*****************************************************************************/
static __inline__ void vlc_thread_join( vlc_thread_t thread )
{
-#ifdef SYS_GNU
- cthread_join( thread );
-#else
+#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
}
*****************************************************************************/
static __inline__ int vlc_mutex_init( vlc_mutex_t *p_mutex )
{
-#ifdef SYS_GNU
- mutex_init( p_mutex );
- return( 0 );
-#else
+#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
}
*****************************************************************************/
static __inline__ int vlc_mutex_lock( vlc_mutex_t *p_mutex )
{
-#ifdef SYS_GNU
- mutex_lock( p_mutex );
- return( 0 );
-#else
+#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
}
*****************************************************************************/
static __inline__ int vlc_mutex_unlock( vlc_mutex_t *p_mutex )
{
-#ifdef SYS_GNU
- mutex_unlock( p_mutex );
- return( 0 );
-#else
+#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 )
{
-#ifdef SYS_GNU
+#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 );
-#else
- return pthread_cond_init( p_condvar, NULL );
+ 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
}
*****************************************************************************/
static __inline__ int vlc_cond_signal( vlc_cond_t *p_condvar )
{
-#ifdef SYS_GNU
+#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 );
-#else
- return pthread_cond_signal( 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
}
*****************************************************************************/
static __inline__ int vlc_cond_wait( vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex )
{
-#ifdef SYS_GNU
- condition_wait( (condition_t)p_condvar, (mutex_t)p_mutex );
- return( 0 );
-#else
+#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
+}
projects / vlc / blobdiff