/*****************************************************************************
- * threads.h : threads implementation for the VideoLAN client
- * This header provides a portable threads implementation.
+ * vlc_threads.h : threads implementation for the VideoLAN client
+ * This header provides portable declarations for mutexes & conditions
*****************************************************************************
- * Copyright (C) 1999, 2000 VideoLAN
- * $Id: vlc_threads.h,v 1.8 2002/07/31 20:56:50 sam Exp $
+ * Copyright (C) 1999, 2002 the VideoLAN team
+ * $Id$
*
* Authors: Jean-Marc Dressler <polux@via.ecp.fr>
* Samuel Hocevar <sam@via.ecp.fr>
* Gildas Bazin <gbazin@netcourrier.com>
+ * Christophe Massiot <massiot@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
*
* 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.
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
-#include <stdio.h>
-
-#if defined(GPROF) || defined(DEBUG)
-# include <sys/time.h>
-#endif
-
-#if defined( PTH_INIT_IN_PTH_H ) /* GNU Pth */
-# include <pth.h>
-
-#elif defined( ST_INIT_IN_ST_H ) /* State threads */
-# include <st.h>
+#ifndef _VLC_THREADS_H_
+#define _VLC_THREADS_H_
-#elif defined( WIN32 ) /* Win32 API */
-# include <process.h>
-
-#elif defined( PTHREAD_COND_T_IN_PTHREAD_H ) /* pthreads (like Linux & BSD) */
-# include <pthread.h>
-# ifdef DEBUG
- /* Needed for pthread_cond_timedwait */
-# include <errno.h>
-# endif
- /* This is not prototyped under Linux, though it exists. */
- int pthread_mutexattr_setkind_np( pthread_mutexattr_t *attr, int kind );
-
-#elif defined( HAVE_CTHREADS_H ) /* GNUMach */
-# include <cthreads.h>
+#if defined( UNDER_CE )
+ /* WinCE API */
+#elif defined( WIN32 )
+# include <process.h> /* Win32 API */
+# include <errno.h>
-#elif defined( HAVE_KERNEL_SCHEDULER_H ) /* BeOS */
+#elif defined( SYS_BEOS ) /* BeOS */
# include <kernel/OS.h>
# include <kernel/scheduler.h>
# include <byteorder.h>
-#else
-# error no threads available on your system !
+#else /* pthreads (like Linux & BSD) */
+# define LIBVLC_USE_PTHREAD 1
+# define _APPLE_C_SOURCE 1 /* Proper pthread semantics on OSX */
+
+# include <stdlib.h> /* lldiv_t definition (only in C99) */
+# include <unistd.h> /* _POSIX_SPIN_LOCKS */
+# include <pthread.h>
+ /* Needed for pthread_cond_timedwait */
+# include <errno.h>
+# include <time.h>
#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 */
+/* Thread priorities */
+#ifdef __APPLE__
+# define VLC_THREAD_PRIORITY_LOW 0
+# define VLC_THREAD_PRIORITY_INPUT 22
+# define VLC_THREAD_PRIORITY_AUDIO 22
+# define VLC_THREAD_PRIORITY_VIDEO 0
+# define VLC_THREAD_PRIORITY_OUTPUT 22
+# define VLC_THREAD_PRIORITY_HIGHEST 22
+
+#elif defined(SYS_BEOS)
+# define VLC_THREAD_PRIORITY_LOW 5
+# define VLC_THREAD_PRIORITY_INPUT 10
+# define VLC_THREAD_PRIORITY_AUDIO 10
+# define VLC_THREAD_PRIORITY_VIDEO 5
+# define VLC_THREAD_PRIORITY_OUTPUT 15
+# define VLC_THREAD_PRIORITY_HIGHEST 15
+
+#elif defined(LIBVLC_USE_PTHREAD)
+# define VLC_THREAD_PRIORITY_LOW 0
+# define VLC_THREAD_PRIORITY_INPUT 10
+# define VLC_THREAD_PRIORITY_AUDIO 5
+# define VLC_THREAD_PRIORITY_VIDEO 0
+# define VLC_THREAD_PRIORITY_OUTPUT 15
+# define VLC_THREAD_PRIORITY_HIGHEST 20
+
+#elif defined(WIN32) || defined(UNDER_CE)
+/* Define different priorities for WinNT/2K/XP and Win9x/Me */
+# define VLC_THREAD_PRIORITY_LOW 0
+# define VLC_THREAD_PRIORITY_INPUT \
+ (IS_WINNT ? THREAD_PRIORITY_ABOVE_NORMAL : 0)
+# define VLC_THREAD_PRIORITY_AUDIO \
+ (IS_WINNT ? THREAD_PRIORITY_HIGHEST : 0)
+# define VLC_THREAD_PRIORITY_VIDEO \
+ (IS_WINNT ? 0 : THREAD_PRIORITY_BELOW_NORMAL )
+# define VLC_THREAD_PRIORITY_OUTPUT \
+ (IS_WINNT ? THREAD_PRIORITY_ABOVE_NORMAL : 0)
+# define VLC_THREAD_PRIORITY_HIGHEST \
+ (IS_WINNT ? THREAD_PRIORITY_TIME_CRITICAL : 0)
-/* 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 */
+#else
+# define VLC_THREAD_PRIORITY_LOW 0
+# define VLC_THREAD_PRIORITY_INPUT 0
+# define VLC_THREAD_PRIORITY_AUDIO 0
+# define VLC_THREAD_PRIORITY_VIDEO 0
+# define VLC_THREAD_PRIORITY_OUTPUT 0
+# define VLC_THREAD_PRIORITY_HIGHEST 0
-/* Error status */
-#define THREAD_ERROR 30 /* an error occured */
-#define THREAD_FATAL 31 /* an fatal error occured - program must end */
+#endif
/*****************************************************************************
* Type definitions
*****************************************************************************/
-#if defined( PTH_INIT_IN_PTH_H )
-typedef pth_t vlc_thread_t;
-typedef pth_mutex_t vlc_mutex_t;
-typedef pth_cond_t vlc_cond_t;
+#if defined (LIBVLC_USE_PTHREAD)
+typedef pthread_t vlc_thread_t;
+typedef pthread_mutex_t vlc_mutex_t;
+typedef pthread_cond_t vlc_cond_t;
+typedef pthread_key_t vlc_threadvar_t;
-#elif defined( ST_INIT_IN_ST_H )
-typedef st_thread_t * vlc_thread_t;
-typedef st_mutex_t * vlc_mutex_t;
-typedef st_cond_t * vlc_cond_t;
+#elif defined( WIN32 ) || defined( UNDER_CE )
+typedef HANDLE vlc_thread_t;
-#elif defined( WIN32 )
-typedef HANDLE vlc_thread_t;
typedef BOOL (WINAPI *SIGNALOBJECTANDWAIT) ( HANDLE, HANDLE, DWORD, BOOL );
-typedef unsigned (__stdcall *PTHREAD_START) (void *);
-typedef struct
-{
- /* WinNT/2K/XP implementation */
- HANDLE mutex;
- /* Win95/98/ME implementation */
- CRITICAL_SECTION csection;
-} vlc_mutex_t;
+typedef HANDLE vlc_mutex_t;
typedef struct
{
volatile int i_waiting_threads;
- /* WinNT/2K/XP implementation */
HANDLE event;
- SIGNALOBJECTANDWAIT SignalObjectAndWait;
- /* Win95/98/ME implementation */
- HANDLE semaphore;
- CRITICAL_SECTION csection;
- int i_win9x_cv;
} vlc_cond_t;
-#elif defined( PTHREAD_COND_T_IN_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;
+typedef DWORD vlc_threadvar_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
-{
- spin_lock_t held;
- spin_lock_t lock;
- char *name;
- struct cthread_queue queue;
-} vlc_mutex_t;
-
-typedef struct
-{
- spin_lock_t lock;
- struct cthread_queue queue;
- char *name;
- struct cond_imp *implications;
-} vlc_cond_t;
-
-#elif defined( HAVE_KERNEL_SCHEDULER_H )
+#elif defined( SYS_BEOS )
/* This is the BeOS implementation of the vlc threads, 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 */
+ * enough for what we need */
typedef thread_id vlc_thread_t;
typedef struct
{
- int32 init;
+ int32_t init;
sem_id lock;
} vlc_mutex_t;
typedef struct
{
- int32 init;
+ int32_t init;
thread_id thread;
} vlc_cond_t;
+typedef struct
+{
+} vlc_threadvar_t;
+
#endif
-/*****************************************************************************
- * Function definitions
- *****************************************************************************/
-VLC_EXPORT( int, __vlc_threads_init, ( vlc_object_t * ) );
-VLC_EXPORT( int, __vlc_threads_end, ( vlc_object_t * ) );
-VLC_EXPORT( int, __vlc_mutex_init, ( vlc_object_t *, vlc_mutex_t * ) );
-VLC_EXPORT( int, __vlc_mutex_destroy, ( char *, int, vlc_mutex_t * ) );
-VLC_EXPORT( int, __vlc_cond_init, ( vlc_object_t *, vlc_cond_t * ) );
-VLC_EXPORT( int, __vlc_cond_destroy, ( char *, int, vlc_cond_t * ) );
-VLC_EXPORT( int, __vlc_thread_create, ( vlc_object_t *, char *, int, char *, void * ( * ) ( void * ), vlc_bool_t ) );
-VLC_EXPORT( void, __vlc_thread_ready, ( vlc_object_t * ) );
-VLC_EXPORT( void, __vlc_thread_join, ( vlc_object_t *, char *, int ) );
+#if defined( WIN32 ) && !defined ETIMEDOUT
+# define ETIMEDOUT 10060 /* This is the value in winsock.h. */
+#endif
/*****************************************************************************
- * vlc_threads_init: initialize threads system
+ * Function definitions
*****************************************************************************/
-#define vlc_threads_init( P_THIS ) \
- __vlc_threads_init( VLC_OBJECT(P_THIS) )
+VLC_EXPORT( int, vlc_mutex_init, ( vlc_mutex_t * ) );
+VLC_EXPORT( int, vlc_mutex_init_recursive, ( vlc_mutex_t * ) );
+VLC_EXPORT( void, __vlc_mutex_destroy, ( const char *, int, vlc_mutex_t * ) );
+VLC_EXPORT( int, __vlc_cond_init, ( vlc_cond_t * ) );
+VLC_EXPORT( void, __vlc_cond_destroy, ( const char *, int, vlc_cond_t * ) );
+VLC_EXPORT( int, vlc_threadvar_create, (vlc_threadvar_t * , void (*) (void *) ) );
+VLC_EXPORT( void, vlc_threadvar_delete, (vlc_threadvar_t *) );
+VLC_EXPORT( int, __vlc_thread_create, ( vlc_object_t *, const char *, int, const char *, void * ( * ) ( void * ), int, bool ) );
+VLC_EXPORT( int, __vlc_thread_set_priority, ( vlc_object_t *, const char *, int, int ) );
+VLC_EXPORT( void, __vlc_thread_join, ( vlc_object_t *, const char *, int ) );
+
+#define vlc_thread_ready vlc_object_signal
/*****************************************************************************
- * vlc_threads_end: deinitialize threads system
+ * vlc_mutex_lock: lock a mutex
*****************************************************************************/
-#define vlc_threads_end( P_THIS ) \
- __vlc_threads_end( VLC_OBJECT(P_THIS) )
+#define vlc_mutex_lock( P_MUTEX ) \
+ __vlc_mutex_lock( __FILE__, __LINE__, P_MUTEX )
-/*****************************************************************************
- * vlc_mutex_init: initialize a mutex
- *****************************************************************************/
-#define vlc_mutex_init( P_THIS, P_MUTEX ) \
- __vlc_mutex_init( VLC_OBJECT(P_THIS), P_MUTEX )
+VLC_EXPORT(void, vlc_pthread_fatal, (const char *action, int error, const char *file, unsigned line));
-/*****************************************************************************
- * vlc_mutex_lock: lock a mutex
- *****************************************************************************/
-#ifdef DEBUG
-# define vlc_mutex_lock( P_MUTEX ) \
- __vlc_mutex_lock( __FILE__, __LINE__, P_MUTEX )
+#if defined(LIBVLC_USE_PTHREAD)
+# define VLC_THREAD_ASSERT( action ) \
+ if (val) \
+ vlc_pthread_fatal (action, val, psz_file, i_line)
#else
-# define vlc_mutex_lock( P_MUTEX ) \
- __vlc_mutex_lock( "(unknown)", 0, P_MUTEX )
+# define VLC_THREAD_ASSERT ((void)(val))
#endif
-static inline int __vlc_mutex_lock( char * psz_file, int i_line,
- vlc_mutex_t *p_mutex )
+static inline void __vlc_mutex_lock( const char * psz_file, int i_line,
+ vlc_mutex_t * p_mutex )
{
-#if defined( PTH_INIT_IN_PTH_H )
- return pth_mutex_acquire( p_mutex, TRUE, NULL );
-
-#elif defined( ST_INIT_IN_ST_H )
- return st_mutex_lock( *p_mutex );
+#if defined(LIBVLC_USE_PTHREAD)
+# define vlc_assert_locked( m ) \
+ assert (pthread_mutex_lock (m) == EDEADLK)
+ int val = pthread_mutex_lock( p_mutex );
+ VLC_THREAD_ASSERT ("locking mutex");
-#elif defined( WIN32 )
- if( p_mutex->mutex )
- {
- WaitForSingleObject( p_mutex->mutex, INFINITE );
- }
- else
- {
- EnterCriticalSection( &p_mutex->csection );
- }
- return 0;
+#elif defined( UNDER_CE )
+ (void)psz_file; (void)i_line;
-#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
- int i_return = pthread_mutex_lock( p_mutex );
- if( i_return )
- {
-// msg_Err( "thread %d: mutex_lock failed at %s:%d (%s)",
-// pthread_self(), psz_file, i_line, strerror(i_return) );
- }
- return i_return;
+ EnterCriticalSection( &p_mutex->csection );
-#elif defined( HAVE_CTHREADS_H )
- mutex_lock( p_mutex );
- return 0;
+#elif defined( WIN32 )
+ (void)psz_file; (void)i_line;
-#elif defined( HAVE_KERNEL_SCHEDULER_H )
- status_t err;
+ WaitForSingleObject( *p_mutex, INFINITE );
- if( !p_mutex )
- {
- return B_BAD_VALUE;
- }
-
- if( p_mutex->init < 2000 )
- {
- return B_NO_INIT;
- }
-
- err = acquire_sem( p_mutex->lock );
- return err;
+#elif defined( SYS_BEOS )
+ acquire_sem( p_mutex->lock );
#endif
}
+#ifndef vlc_assert_locked
+# define vlc_assert_locked( m ) (void)0
+#endif
+
/*****************************************************************************
* vlc_mutex_unlock: unlock a mutex
*****************************************************************************/
-#ifdef DEBUG
-# define vlc_mutex_unlock( P_MUTEX ) \
- __vlc_mutex_unlock( __FILE__, __LINE__, P_MUTEX )
-#else
-# define vlc_mutex_unlock( P_MUTEX ) \
- __vlc_mutex_unlock( "(unknown)", 0, P_MUTEX )
-#endif
+#define vlc_mutex_unlock( P_MUTEX ) \
+ __vlc_mutex_unlock( __FILE__, __LINE__, P_MUTEX )
-static inline int __vlc_mutex_unlock( char * psz_file, int i_line,
+static inline void __vlc_mutex_unlock( const char * psz_file, int i_line,
vlc_mutex_t *p_mutex )
{
-#if defined( PTH_INIT_IN_PTH_H )
- return pth_mutex_release( p_mutex );
+#if defined(LIBVLC_USE_PTHREAD)
+ int val = pthread_mutex_unlock( p_mutex );
+ VLC_THREAD_ASSERT ("unlocking mutex");
-#elif defined( ST_INIT_IN_ST_H )
- return st_mutex_unlock( *p_mutex );
+#elif defined( UNDER_CE )
+ (void)psz_file; (void)i_line;
-#elif defined( WIN32 )
- if( p_mutex->mutex )
- {
- ReleaseMutex( p_mutex->mutex );
- }
- else
- {
- LeaveCriticalSection( &p_mutex->csection );
- }
- return 0;
+ LeaveCriticalSection( &p_mutex->csection );
-#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
- int i_return = pthread_mutex_unlock( p_mutex );
- if( i_return )
- {
-// msg_Err( "thread %d: mutex_unlock failed at %s:%d (%s)",
-// pthread_self(), psz_file, i_line, strerror(i_return) );
- }
- return i_return;
-
-#elif defined( HAVE_CTHREADS_H )
- mutex_unlock( p_mutex );
- return 0;
-
-#elif defined( HAVE_KERNEL_SCHEDULER_H )
- if( !p_mutex)
- {
- return B_BAD_VALUE;
- }
+#elif defined( WIN32 )
+ (void)psz_file; (void)i_line;
- if( p_mutex->init < 2000 )
- {
- return B_NO_INIT;
- }
+ ReleaseMutex( *p_mutex );
+#elif defined( SYS_BEOS )
release_sem( p_mutex->lock );
- return B_OK;
#endif
}
/*****************************************************************************
* vlc_mutex_destroy: destroy a mutex
*****************************************************************************/
-#ifdef DEBUG
-# define vlc_mutex_destroy( P_MUTEX ) \
- __vlc_mutex_destroy( __FILE__, __LINE__, P_MUTEX )
-#else
-# define vlc_mutex_destroy( P_MUTEX ) \
- __vlc_mutex_destroy( "(unknown)", 0, P_MUTEX )
-#endif
+#define vlc_mutex_destroy( P_MUTEX ) \
+ __vlc_mutex_destroy( __FILE__, __LINE__, P_MUTEX )
/*****************************************************************************
* vlc_cond_init: initialize a condition
*****************************************************************************/
-#define vlc_cond_init( P_THIS, P_COND ) \
- __vlc_cond_init( VLC_OBJECT(P_THIS), P_COND )
+#define vlc_cond_init( P_THIS, P_COND ) \
+ __vlc_cond_init( P_COND )
/*****************************************************************************
* vlc_cond_signal: start a thread on condition completion
*****************************************************************************/
-static inline int vlc_cond_signal( vlc_cond_t *p_condvar )
+#define vlc_cond_signal( P_COND ) \
+ __vlc_cond_signal( __FILE__, __LINE__, P_COND )
+
+static inline void __vlc_cond_signal( const char * psz_file, int i_line,
+ vlc_cond_t *p_condvar )
{
-#if defined( PTH_INIT_IN_PTH_H )
- return pth_cond_notify( p_condvar, FALSE );
+#if defined(LIBVLC_USE_PTHREAD)
+ int val = pthread_cond_signal( p_condvar );
+ VLC_THREAD_ASSERT ("signaling condition variable");
-#elif defined( ST_INIT_IN_ST_H )
- return st_cond_signal( *p_condvar );
+#elif defined( UNDER_CE ) || defined( WIN32 )
+ (void)psz_file; (void)i_line;
-#elif defined( WIN32 )
/* Release one waiting thread if one is available. */
/* For this trick to work properly, the vlc_cond_signal must be surrounded
* by a mutex. This will prevent another thread from stealing the signal */
- if( !p_condvar->semaphore )
- {
- PulseEvent( p_condvar->event );
- }
- else if( p_condvar->i_win9x_cv == 1 )
- {
- /* Wait for the gate to be open */
- WaitForSingleObject( p_condvar->event, INFINITE );
-
- if( p_condvar->i_waiting_threads )
- {
- /* Using a semaphore exposes us to a race condition. It is
- * possible for another thread to start waiting on the semaphore
- * just after we signaled it and thus steal the signal.
- * We have to prevent new threads from entering the cond_wait(). */
- ResetEvent( p_condvar->event );
-
- /* A semaphore is used here because Win9x doesn't have
- * SignalObjectAndWait() and thus a race condition exists
- * during the time we release the mutex and the time we start
- * waiting on the event (more precisely, the signal can sometimes
- * be missed by the waiting thread if we use PulseEvent()). */
- ReleaseSemaphore( p_condvar->semaphore, 1, 0 );
- }
- }
- else
- {
- if( p_condvar->i_waiting_threads )
- {
- ReleaseSemaphore( p_condvar->semaphore, 1, 0 );
-
- /* Wait for the last thread to be awakened */
- WaitForSingleObject( p_condvar->event, INFINITE );
- }
- }
- return 0;
-
-#elif defined( PTHREAD_COND_T_IN_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 )
- if( !p_condvar )
- {
- return B_BAD_VALUE;
- }
-
- if( p_condvar->init < 2000 )
- {
- return B_NO_INIT;
- }
+ /* PulseEvent() only works if none of the waiting threads is suspended.
+ * This is particularily problematic under a debug session.
+ * as documented in http://support.microsoft.com/kb/q173260/ */
+ PulseEvent( p_condvar->event );
+#elif defined( SYS_BEOS )
while( p_condvar->thread != -1 )
{
thread_info info;
if( get_thread_info(p_condvar->thread, &info) == B_BAD_VALUE )
- {
- return 0;
- }
+ return;
if( info.state != B_THREAD_SUSPENDED )
{
{
/* Ok, we have to wake up that thread */
resume_thread( p_condvar->thread );
- return 0;
}
}
- return 0;
#endif
}
/*****************************************************************************
- * vlc_cond_broadcast: start all threads waiting on condition completion
+ * vlc_cond_wait: wait until condition completion
*****************************************************************************/
-/*
- * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
- * Only works with pthreads, you need to adapt it for others
- * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
- */
-static inline int vlc_cond_broadcast( vlc_cond_t *p_condvar )
-{
-#if defined( PTH_INIT_IN_PTH_H )
- return pth_cond_notify( p_condvar, FALSE );
+#define vlc_cond_wait( P_COND, P_MUTEX ) \
+ __vlc_cond_wait( __FILE__, __LINE__, P_COND, P_MUTEX )
-#elif defined( ST_INIT_IN_ST_H )
- return st_cond_broadcast( p_condvar );
-
-#elif defined( WIN32 )
- /* Release all waiting threads. */
- int i;
-
- if( !p_condvar->semaphore )
- for( i = p_condvar->i_waiting_threads; i > 0; i-- )
- PulseEvent( p_condvar->event );
- else if( p_condvar->i_win9x_cv == 1 )
- {
- /* Wait for the gate to be open */
- WaitForSingleObject( p_condvar->event, INFINITE );
-
- if( p_condvar->i_waiting_threads )
- {
- /* close gate */
- ResetEvent( p_condvar->event );
-
- ReleaseSemaphore( p_condvar->semaphore,
- p_condvar->i_waiting_threads, 0 );
- }
- }
- else
- {
- if( p_condvar->i_waiting_threads )
- {
- ReleaseSemaphore( p_condvar->semaphore,
- p_condvar->i_waiting_threads, 0 );
- /* Wait for the last thread to be awakened */
- WaitForSingleObject( p_condvar->event, INFINITE );
- }
- }
+static inline void __vlc_cond_wait( const char * psz_file, int i_line,
+ vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex )
+{
+#if defined(LIBVLC_USE_PTHREAD)
+ int val = pthread_cond_wait( p_condvar, p_mutex );
+ VLC_THREAD_ASSERT ("waiting on condition");
- return 0;
+#elif defined( UNDER_CE )
+ p_condvar->i_waiting_threads++;
+ LeaveCriticalSection( &p_mutex->csection );
+ WaitForSingleObject( p_condvar->event, INFINITE );
+ p_condvar->i_waiting_threads--;
-#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
- return pthread_cond_broadcast( p_condvar );
+ /* Reacquire the mutex before returning. */
+ vlc_mutex_lock( p_mutex );
-#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( WIN32 )
+ (void)psz_file; (void)i_line;
-#elif defined( HAVE_KERNEL_SCHEDULER_H )
- if( !p_condvar )
- {
- return B_BAD_VALUE;
- }
+ /* Increase our wait count */
+ p_condvar->i_waiting_threads++;
+ SignalObjectAndWait( *p_mutex, p_condvar->event, INFINITE, FALSE );
+ p_condvar->i_waiting_threads--;
- if( p_condvar->init < 2000 )
- {
- return B_NO_INIT;
- }
+ /* Reacquire the mutex before returning. */
+ vlc_mutex_lock( p_mutex );
- while( p_condvar->thread != -1 )
- {
- thread_info info;
- if( get_thread_info(p_condvar->thread, &info) == B_BAD_VALUE )
- {
- return 0;
- }
+#elif defined( SYS_BEOS )
+ /* 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;
- 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;
+ vlc_mutex_lock( p_mutex );
#endif
}
+
/*****************************************************************************
- * vlc_cond_wait: wait until condition completion
+ * vlc_cond_timedwait: wait until condition completion or expiration
+ *****************************************************************************
+ * Returns 0 if object signaled, an error code in case of timeout or error.
*****************************************************************************/
-#ifdef DEBUG
-# define vlc_cond_wait( P_COND, P_MUTEX ) \
- __vlc_cond_wait( __FILE__, __LINE__, P_COND, P_MUTEX )
-#else
-# define vlc_cond_wait( P_COND, P_MUTEX ) \
- __vlc_cond_wait( "(unknown)", 0, P_COND, P_MUTEX )
-#endif
+#define vlc_cond_timedwait( P_COND, P_MUTEX, DEADLINE ) \
+ __vlc_cond_timedwait( __FILE__, __LINE__, P_COND, P_MUTEX, DEADLINE )
-static inline int __vlc_cond_wait( char * psz_file, int i_line,
- vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex )
+static inline int __vlc_cond_timedwait( const char * psz_file, int i_line,
+ vlc_cond_t *p_condvar,
+ vlc_mutex_t *p_mutex,
+ mtime_t deadline )
{
-#if defined( PTH_INIT_IN_PTH_H )
- return pth_cond_await( p_condvar, p_mutex, NULL );
+#if defined(LIBVLC_USE_PTHREAD)
+ lldiv_t d = lldiv( deadline, 1000000 );
+ struct timespec ts = { d.quot, d.rem * 1000 };
+
+ int val = pthread_cond_timedwait (p_condvar, p_mutex, &ts);
+ if (val == ETIMEDOUT)
+ return ETIMEDOUT; /* this error is perfectly normal */
+ VLC_THREAD_ASSERT ("timed-waiting on condition");
+
+#elif defined( UNDER_CE )
+ mtime_t delay_ms = (deadline - mdate())/1000;
+ DWORD result;
+ if( delay_ms < 0 )
+ delay_ms = 0;
+
+ p_condvar->i_waiting_threads++;
+ LeaveCriticalSection( &p_mutex->csection );
+ result = WaitForSingleObject( p_condvar->event, delay_ms );
+ p_condvar->i_waiting_threads--;
-#elif defined( ST_INIT_IN_ST_H )
- int i_ret;
+ /* Reacquire the mutex before returning. */
+ vlc_mutex_lock( p_mutex );
- st_mutex_unlock( *p_mutex );
- i_ret = st_cond_wait( *p_condvar );
- st_mutex_lock( *p_mutex );
+ if(result == WAIT_TIMEOUT)
+ return ETIMEDOUT; /* this error is perfectly normal */
- return i_ret;
+ (void)psz_file; (void)i_line;
#elif defined( WIN32 )
- if( !p_condvar->semaphore )
- {
- /* Increase our wait count */
- p_condvar->i_waiting_threads++;
-
- if( p_condvar->SignalObjectAndWait && p_mutex->mutex )
- /* It is only possible to atomically release the mutex and initiate the
- * waiting on WinNT/2K/XP. Win9x doesn't have SignalObjectAndWait(). */
- p_condvar->SignalObjectAndWait( p_mutex->mutex,
- p_condvar->event,
- INFINITE, FALSE );
- else
- {
- LeaveCriticalSection( &p_mutex->csection );
- WaitForSingleObject( p_condvar->event, INFINITE );
- }
+ mtime_t delay_ms = (deadline - mdate())/1000;
+ DWORD result;
+ if( delay_ms < 0 )
+ delay_ms = 0;
- p_condvar->i_waiting_threads--;
- }
- else if( p_condvar->i_win9x_cv == 1 )
- {
- int i_waiting_threads;
+ /* Increase our wait count */
+ p_condvar->i_waiting_threads++;
+ result = SignalObjectAndWait( *p_mutex, p_condvar->event,
+ delay_ms, FALSE );
+ p_condvar->i_waiting_threads--;
- /* Wait for the gate to be open */
- WaitForSingleObject( p_condvar->event, INFINITE );
+ /* Reacquire the mutex before returning. */
+ vlc_mutex_lock( p_mutex );
+ if(result == WAIT_TIMEOUT)
+ return ETIMEDOUT; /* this error is perfectly normal */
- /* Increase our wait count */
- p_condvar->i_waiting_threads++;
+ (void)psz_file; (void)i_line;
- LeaveCriticalSection( &p_mutex->csection );
- WaitForSingleObject( p_condvar->semaphore, INFINITE );
+#elif defined( SYS_BEOS )
+# error Unimplemented
- /* Decrement and test must be atomic */
- EnterCriticalSection( &p_condvar->csection );
+#endif
- /* Decrease our wait count */
- i_waiting_threads = --p_condvar->i_waiting_threads;
+ return 0;
+}
- LeaveCriticalSection( &p_condvar->csection );
+/*****************************************************************************
+ * vlc_cond_destroy: destroy a condition
+ *****************************************************************************/
+#define vlc_cond_destroy( P_COND ) \
+ __vlc_cond_destroy( __FILE__, __LINE__, P_COND )
- /* Reopen the gate if we were the last waiting thread */
- if( !i_waiting_threads )
- SetEvent( p_condvar->event );
- }
- else
- {
- int i_waiting_threads;
+/*****************************************************************************
+ * vlc_threadvar_set: create: set the value of a thread-local variable
+ *****************************************************************************/
+static inline int vlc_threadvar_set( vlc_threadvar_t * p_tls, void *p_value )
+{
+ int i_ret;
- /* Increase our wait count */
- p_condvar->i_waiting_threads++;
+#if defined(LIBVLC_USE_PTHREAD)
+ i_ret = pthread_setspecific( *p_tls, p_value );
- LeaveCriticalSection( &p_mutex->csection );
- WaitForSingleObject( p_condvar->semaphore, INFINITE );
+#elif defined( SYS_BEOS )
+ i_ret = EINVAL;
- /* Decrement and test must be atomic */
- EnterCriticalSection( &p_condvar->csection );
+#elif defined( UNDER_CE ) || defined( WIN32 )
+ i_ret = TlsSetValue( *p_tls, p_value ) ? EINVAL : 0;
- /* Decrease our wait count */
- i_waiting_threads = --p_condvar->i_waiting_threads;
+#endif
- LeaveCriticalSection( &p_condvar->csection );
+ return i_ret;
+}
- /* Signal that the last waiting thread just went through */
- if( !i_waiting_threads )
- SetEvent( p_condvar->event );
- }
+/*****************************************************************************
+ * vlc_threadvar_get: create: get the value of a thread-local variable
+ *****************************************************************************/
+static inline void* vlc_threadvar_get( vlc_threadvar_t * p_tls )
+{
+ void *p_ret;
- /* Reacquire the mutex before returning. */
- vlc_mutex_lock( p_mutex );
+#if defined(LIBVLC_USE_PTHREAD)
+ p_ret = pthread_getspecific( *p_tls );
- return 0;
+#elif defined( SYS_BEOS )
+ p_ret = NULL;
-#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
+#elif defined( UNDER_CE ) || defined( WIN32 )
+ p_ret = TlsGetValue( *p_tls );
-# ifdef DEBUG
- /* In debug mode, timeout */
- struct timeval now;
- struct timespec timeout;
- int i_result;
+#endif
- for( ; ; )
- {
- gettimeofday( &now, NULL );
- timeout.tv_sec = now.tv_sec + THREAD_COND_TIMEOUT;
- timeout.tv_nsec = now.tv_usec * 1000;
+ return p_ret;
+}
- i_result = pthread_cond_timedwait( p_condvar, p_mutex, &timeout );
+# if defined (_POSIX_SPIN_LOCKS) && ((_POSIX_SPIN_LOCKS - 0) > 0)
+typedef pthread_spinlock_t vlc_spinlock_t;
- if( i_result == ETIMEDOUT )
- {
-//X msg_Warn( "thread %d: possible deadlock detected "
-//X "in cond_wait at %s:%d (%s)", pthread_self(),
-//X psz_file, i_line, strerror(i_result) );
- continue;
- }
+/**
+ * Initializes a spinlock.
+ */
+static inline int vlc_spin_init (vlc_spinlock_t *spin)
+{
+ return pthread_spin_init (spin, PTHREAD_PROCESS_PRIVATE);
+}
- if( i_result )
- {
-//X msg_Err( "thread %d: cond_wait failed at %s:%d (%s)",
-//X pthread_self(), psz_file, i_line, strerror(i_result) );
- }
- return( i_result );
- }
-# else
- return pthread_cond_wait( p_condvar, p_mutex );
-# endif
+/**
+ * Acquires a spinlock.
+ */
+static inline void vlc_spin_lock (vlc_spinlock_t *spin)
+{
+ pthread_spin_lock (spin);
+}
-#elif defined( HAVE_CTHREADS_H )
- condition_wait( (condition_t)p_condvar, (mutex_t)p_mutex );
- return 0;
+/**
+ * Releases a spinlock.
+ */
+static inline void vlc_spin_unlock (vlc_spinlock_t *spin)
+{
+ pthread_spin_unlock (spin);
+}
-#elif defined( HAVE_KERNEL_SCHEDULER_H )
- if( !p_condvar )
- {
- return B_BAD_VALUE;
- }
+/**
+ * Deinitializes a spinlock.
+ */
+static inline void vlc_spin_destroy (vlc_spinlock_t *spin)
+{
+ pthread_spin_destroy (spin);
+}
- if( !p_mutex )
- {
- return B_BAD_VALUE;
- }
+#elif defined( WIN32 )
- if( p_condvar->init < 2000 )
- {
- return B_NO_INIT;
- }
+typedef CRITICAL_SECTION vlc_spinlock_t;
- /* 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;
+/**
+ * Initializes a spinlock.
+ */
+static inline int vlc_spin_init (vlc_spinlock_t *spin)
+{
+ return !InitializeCriticalSectionAndSpinCount(spin, 4000);
+}
- vlc_mutex_lock( p_mutex );
- return 0;
+/**
+ * Acquires a spinlock.
+ */
+static inline void vlc_spin_lock (vlc_spinlock_t *spin)
+{
+ EnterCriticalSection(spin);
+}
-#endif
+/**
+ * Releases a spinlock.
+ */
+static inline void vlc_spin_unlock (vlc_spinlock_t *spin)
+{
+ LeaveCriticalSection(spin);
+}
+
+/**
+ * Deinitializes a spinlock.
+ */
+static inline void vlc_spin_destroy (vlc_spinlock_t *spin)
+{
+ DeleteCriticalSection(spin);
}
-/*****************************************************************************
- * vlc_cond_destroy: destroy a condition
- *****************************************************************************/
-#ifdef DEBUG
-# define vlc_cond_destroy( P_COND ) \
- __vlc_cond_destroy( __FILE__, __LINE__, P_COND )
#else
-# define vlc_cond_destroy( P_COND ) \
- __vlc_cond_destroy( "(unknown)", 0, P_COND )
+
+/* Fallback to plain mutexes if spinlocks are not available */
+typedef vlc_mutex_t vlc_spinlock_t;
+
+static inline int vlc_spin_init (vlc_spinlock_t *spin)
+{
+ return vlc_mutex_init (spin);
+}
+
+# define vlc_spin_lock vlc_mutex_lock
+# define vlc_spin_unlock vlc_mutex_unlock
+# define vlc_spin_destroy vlc_mutex_destroy
#endif
+/**
+ * Issues a full memory barrier.
+ */
+#if defined (__APPLE__)
+# include <libkern/OSAtomic.h> /* OSMemoryBarrier() */
+#endif
+static inline void barrier (void)
+{
+#if defined (__GNUC__) && (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)
+ __sync_synchronize ();
+#elif defined(__APPLE__)
+ OSMemoryBarrier ();
+#elif defined(__powerpc__)
+ asm volatile ("sync":::"memory");
+#elif defined(__i386__)
+ asm volatile ("mfence":::"memory");
+#elif defined (LIBVLC_USE_PTHREAD)
+ static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
+ pthread_mutex_lock (&lock);
+ pthread_mutex_unlock (&lock);
+#else
+# error barrier not implemented!
+#endif
+}
+
/*****************************************************************************
* vlc_thread_create: create a thread
*****************************************************************************/
-# define vlc_thread_create( P_THIS, PSZ_NAME, FUNC, WAIT ) \
- __vlc_thread_create( VLC_OBJECT(P_THIS), __FILE__, __LINE__, PSZ_NAME, (void * ( * ) ( void * ))FUNC, WAIT )
+#define vlc_thread_create( P_THIS, PSZ_NAME, FUNC, PRIORITY, WAIT ) \
+ __vlc_thread_create( VLC_OBJECT(P_THIS), __FILE__, __LINE__, PSZ_NAME, (void * ( * ) ( void * ))FUNC, PRIORITY, WAIT )
/*****************************************************************************
- * vlc_thread_ready: tell the parent thread we were successfully spawned
+ * vlc_thread_set_priority: set the priority of the calling thread
*****************************************************************************/
-# define vlc_thread_ready( P_THIS ) \
- __vlc_thread_ready( VLC_OBJECT(P_THIS) )
+#define vlc_thread_set_priority( P_THIS, PRIORITY ) \
+ __vlc_thread_set_priority( VLC_OBJECT(P_THIS), __FILE__, __LINE__, PRIORITY )
/*****************************************************************************
* vlc_thread_join: wait until a thread exits
*****************************************************************************/
-#ifdef DEBUG
-# define vlc_thread_join( P_THIS ) \
- __vlc_thread_join( VLC_OBJECT(P_THIS), __FILE__, __LINE__ )
-#else
-# define vlc_thread_join( P_THIS ) \
- __vlc_thread_join( VLC_OBJECT(P_THIS), "(unknown)", 0 )
-#endif
+#define vlc_thread_join( P_THIS ) \
+ __vlc_thread_join( VLC_OBJECT(P_THIS), __FILE__, __LINE__ )
+
+#endif /* !_VLC_THREADS_H */
projects / vlc / blobdiff