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VLC Source 0.5.3.dmg
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threads.c
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/*****************************************************************************
* threads.c : threads implementation for the VideoLAN client
*****************************************************************************
* Copyright (C) 1999, 2000, 2001, 2002 VideoLAN
* $Id: threads.c,v 1.40 2003/03/10 00:04:14 massiot Exp $
*
* Authors: Jean-Marc Dressler <polux@via.ecp.fr>
* Samuel Hocevar <sam@zoy.org>
* Gildas Bazin <gbazin@netcourrier.com>
*
* 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 <vlc/vlc.h>
#include <stdlib.h>
#define VLC_THREADS_UNINITIALIZED 0
#define VLC_THREADS_PENDING 1
#define VLC_THREADS_ERROR 2
#define VLC_THREADS_READY 3
/*****************************************************************************
* Global mutex for lazy initialization of the threads system
*****************************************************************************/
static volatile int i_initializations = 0;
#if defined( PTH_INIT_IN_PTH_H )
#elif defined( ST_INIT_IN_ST_H )
#elif defined( UNDER_CE )
#elif defined( WIN32 )
#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
static pthread_mutex_t once_mutex = PTHREAD_MUTEX_INITIALIZER;
#elif defined( HAVE_CTHREADS_H )
#elif defined( HAVE_KERNEL_SCHEDULER_H )
#endif
/*****************************************************************************
* Global variable for named mutexes
*****************************************************************************/
typedef struct vlc_namedmutex_t vlc_namedmutex_t;
struct vlc_namedmutex_t
{
vlc_mutex_t lock;
char *psz_name;
int i_usage;
vlc_namedmutex_t *p_next;
};
/*****************************************************************************
* vlc_threads_init: initialize threads system
*****************************************************************************
* This function requires lazy initialization of a global lock in order to
* keep the library really thread-safe. Some architectures don't support this
* and thus do not guarantee the complete reentrancy.
*****************************************************************************/
int __vlc_threads_init( vlc_object_t *p_this )
{
static volatile int i_status = VLC_THREADS_UNINITIALIZED;
libvlc_t *p_libvlc = (libvlc_t *)p_this;
int i_ret = VLC_SUCCESS;
/* If we have lazy mutex initialization, use it. Otherwise, we just
* hope nothing wrong happens. */
#if defined( PTH_INIT_IN_PTH_H )
#elif defined( ST_INIT_IN_ST_H )
#elif defined( UNDER_CE )
#elif defined( WIN32 )
HINSTANCE hInstLib;
#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
pthread_mutex_lock( &once_mutex );
#elif defined( HAVE_CTHREADS_H )
#elif defined( HAVE_KERNEL_SCHEDULER_H )
#endif
if( i_status == VLC_THREADS_UNINITIALIZED )
{
i_status = VLC_THREADS_PENDING;
/* We should be safe now. Do all the initialization stuff we want. */
p_libvlc->b_ready = VLC_FALSE;
#if defined( PTH_INIT_IN_PTH_H )
i_ret = ( pth_init() == FALSE );
#elif defined( ST_INIT_IN_ST_H )
i_ret = st_init();
#elif defined( UNDER_CE )
/* Nothing to initialize */
#elif defined( WIN32 )
/* Dynamically get the address of SignalObjectAndWait */
if( GetVersion() < 0x80000000 )
{
/* We are running on NT/2K/XP, we can use SignalObjectAndWait */
hInstLib = LoadLibrary( "kernel32" );
if( hInstLib )
{
p_libvlc->SignalObjectAndWait =
(SIGNALOBJECTANDWAIT)GetProcAddress( hInstLib,
"SignalObjectAndWait" );
}
}
else
{
p_libvlc->SignalObjectAndWait = NULL;
}
p_libvlc->b_fast_mutex = 0;
p_libvlc->i_win9x_cv = 0;
#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
#elif defined( HAVE_CTHREADS_H )
#elif defined( HAVE_KERNEL_SCHEDULER_H )
#endif
vlc_object_create( p_libvlc, VLC_OBJECT_ROOT );
if( i_ret )
{
i_status = VLC_THREADS_ERROR;
}
else
{
i_initializations++;
i_status = VLC_THREADS_READY;
}
}
else
{
/* Just increment the initialization count */
i_initializations++;
}
/* If we have lazy mutex initialization support, unlock the mutex;
* otherwize, do a naive wait loop. */
#if defined( PTH_INIT_IN_PTH_H )
while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
#elif defined( ST_INIT_IN_ST_H )
while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
#elif defined( UNDER_CE )
while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
#elif defined( WIN32 )
while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
pthread_mutex_unlock( &once_mutex );
#elif defined( HAVE_CTHREADS_H )
while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
#elif defined( HAVE_KERNEL_SCHEDULER_H )
while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
#endif
if( i_status != VLC_THREADS_READY )
{
return VLC_ETHREAD;
}
return i_ret;
}
/*****************************************************************************
* vlc_threads_end: stop threads system
*****************************************************************************
* FIXME: This function is far from being threadsafe. We should undo exactly
* what we did above in vlc_threads_init.
*****************************************************************************/
int __vlc_threads_end( vlc_object_t *p_this )
{
#if defined( PTH_INIT_IN_PTH_H )
i_initializations--;
if( i_initializations == 0 )
{
return ( pth_kill() == FALSE );
}
#elif defined( ST_INIT_IN_ST_H )
i_initializations--;
#elif defined( UNDER_CE )
i_initializations--;
#elif defined( WIN32 )
i_initializations--;
#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
pthread_mutex_lock( &once_mutex );
i_initializations--;
pthread_mutex_unlock( &once_mutex );
#elif defined( HAVE_CTHREADS_H )
i_initializations--;
#elif defined( HAVE_KERNEL_SCHEDULER_H )
i_initializations--;
#endif
return VLC_SUCCESS;
}
/*****************************************************************************
* Prototype for GPROF wrapper
*****************************************************************************/
#ifdef GPROF
typedef void *(*vlc_thread_func_t)(void *p_data);
/* Wrapper function for profiling */
static void * vlc_thread_wrapper ( void *p_wrapper );
# if defined( WIN32 ) && !defined( UNDER_CE )
# define ITIMER_REAL 1
# define ITIMER_PROF 2
struct itimerval
{
struct timeval it_value;
struct timeval it_interval;
};
int setitimer(int kind, const struct itimerval* itnew, struct itimerval* itold);
# endif /* WIN32 && !UNDER_CE */
typedef struct wrapper_t
{
/* Data lock access */
vlc_mutex_t lock;
vlc_cond_t wait;
/* Data used to spawn the real thread */
vlc_thread_func_t func;
void *p_data;
/* Profiling timer passed to the thread */
struct itimerval itimer;
} wrapper_t;
#endif /* GPROF */
/*****************************************************************************
* vlc_mutex_init: initialize a mutex
*****************************************************************************/
int __vlc_mutex_init( vlc_object_t *p_this, vlc_mutex_t *p_mutex )
{
p_mutex->p_this = p_this;
#if defined( PTH_INIT_IN_PTH_H )
return ( pth_mutex_init( &p_mutex->mutex ) == FALSE );
#elif defined( ST_INIT_IN_ST_H )
p_mutex->mutex = st_mutex_new();
return ( p_mutex->mutex == NULL ) ? errno : 0;
#elif defined( UNDER_CE )
InitializeCriticalSection( &p_mutex->csection );
return 0;
#elif defined( WIN32 )
/* We use mutexes on WinNT/2K/XP because we can use the SignalObjectAndWait
* function and have a 100% correct vlc_cond_wait() implementation.
* As this function is not available on Win9x, we can use the faster
* CriticalSections */
if( p_this->p_libvlc->SignalObjectAndWait &&
!p_this->p_libvlc->b_fast_mutex )
{
/* We are running on NT/2K/XP, we can use SignalObjectAndWait */
p_mutex->mutex = CreateMutex( 0, FALSE, 0 );
return ( p_mutex->mutex != NULL ? 0 : 1 );
}
else
{
p_mutex->mutex = NULL;
InitializeCriticalSection( &p_mutex->csection );
return 0;
}
#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
# if defined(DEBUG) && defined(SYS_LINUX)
{
/* Create error-checking mutex to detect problems more easily. */
pthread_mutexattr_t attr;
int i_result;
pthread_mutexattr_init( &attr );
pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_ERRORCHECK_NP );
i_result = pthread_mutex_init( &p_mutex->mutex, &attr );
pthread_mutexattr_destroy( &attr );
return( i_result );
}
# endif
return pthread_mutex_init( &p_mutex->mutex, NULL );
#elif defined( HAVE_CTHREADS_H )
mutex_init( p_mutex );
return 0;
#elif defined( HAVE_KERNEL_SCHEDULER_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_destroy: destroy a mutex, inner version
*****************************************************************************/
int __vlc_mutex_destroy( char * psz_file, int i_line, vlc_mutex_t *p_mutex )
{
int i_result;
/* In case of error : */
int i_thread = -1;
const char * psz_error = "";
#if defined( PTH_INIT_IN_PTH_H )
return 0;
#elif defined( ST_INIT_IN_ST_H )
i_result = st_mutex_destroy( p_mutex->mutex );
#elif defined( UNDER_CE )
DeleteCriticalSection( &p_mutex->csection );
return 0;
#elif defined( WIN32 )
if( p_mutex->mutex )
{
CloseHandle( p_mutex->mutex );
}
else
{
DeleteCriticalSection( &p_mutex->csection );
}
return 0;
#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
i_result = pthread_mutex_destroy( &p_mutex->mutex );
if ( i_result )
{
i_thread = (int)pthread_self();
psz_error = strerror(i_result);
}
#elif defined( HAVE_CTHREADS_H )
return 0;
#elif defined( HAVE_KERNEL_SCHEDULER_H )
if( p_mutex->init == 9999 )
{
delete_sem( p_mutex->lock );
}
p_mutex->init = 0;
return B_OK;
#endif
if( i_result )
{
msg_Err( p_mutex->p_this,
"thread %d: mutex_destroy failed at %s:%d (%d:%s)",
i_thread, psz_file, i_line, i_result, psz_error );
}
return i_result;
}
/*****************************************************************************
* vlc_cond_init: initialize a condition
*****************************************************************************/
int __vlc_cond_init( vlc_object_t *p_this, vlc_cond_t *p_condvar )
{
p_condvar->p_this = p_this;
#if defined( PTH_INIT_IN_PTH_H )
return ( pth_cond_init( &p_condvar->cond ) == FALSE );
#elif defined( ST_INIT_IN_ST_H )
p_condvar->cond = st_cond_new();
return ( p_condvar->cond == NULL ) ? errno : 0;
#elif defined( UNDER_CE )
/* Initialize counter */
p_condvar->i_waiting_threads = 0;
/* Create an auto-reset event. */
p_condvar->event = CreateEvent( NULL, /* no security */
FALSE, /* auto-reset event */
FALSE, /* start non-signaled */
NULL ); /* unnamed */
return !p_condvar->event;
#elif defined( WIN32 )
/* Initialize counter */
p_condvar->i_waiting_threads = 0;
/* Misc init */
p_condvar->i_win9x_cv = p_this->p_libvlc->i_win9x_cv;
p_condvar->SignalObjectAndWait = p_this->p_libvlc->SignalObjectAndWait;
if( (p_condvar->SignalObjectAndWait && !p_this->p_libvlc->b_fast_mutex)
|| p_condvar->i_win9x_cv == 0 )
{
/* Create an auto-reset event. */
p_condvar->event = CreateEvent( NULL, /* no security */
FALSE, /* auto-reset event */
FALSE, /* start non-signaled */
NULL ); /* unnamed */
p_condvar->semaphore = NULL;
return !p_condvar->event;
}
else
{
p_condvar->semaphore = CreateSemaphore( NULL, /* no security */
0, /* initial count */
0x7fffffff, /* max count */
NULL ); /* unnamed */
if( p_condvar->i_win9x_cv == 1 )
/* Create a manual-reset event initially signaled. */
p_condvar->event = CreateEvent( NULL, TRUE, TRUE, NULL );
else
/* Create a auto-reset event. */
p_condvar->event = CreateEvent( NULL, FALSE, FALSE, NULL );
InitializeCriticalSection( &p_condvar->csection );
return !p_condvar->semaphore || !p_condvar->event;
}
#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
return pthread_cond_init( &p_condvar->cond, 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 )
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_destroy: destroy a condition, inner version
*****************************************************************************/
int __vlc_cond_destroy( char * psz_file, int i_line, vlc_cond_t *p_condvar )
{
int i_result;
/* In case of error : */
int i_thread = -1;
const char * psz_error = "";
#if defined( PTH_INIT_IN_PTH_H )
return 0;
#elif defined( ST_INIT_IN_ST_H )
i_result = st_cond_destroy( p_condvar->cond );
#elif defined( UNDER_CE )
i_result = !CloseHandle( p_condvar->event );
#elif defined( WIN32 )
if( !p_condvar->semaphore )
i_result = !CloseHandle( p_condvar->event );
else
i_result = !CloseHandle( p_condvar->event )
|| !CloseHandle( p_condvar->semaphore );
#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
i_result = pthread_cond_destroy( &p_condvar->cond );
if ( i_result )
{
i_thread = (int)pthread_self();
psz_error = strerror(i_result);
}
#elif defined( HAVE_CTHREADS_H )
return 0;
#elif defined( HAVE_KERNEL_SCHEDULER_H )
p_condvar->init = 0;
return 0;
#endif
if( i_result )
{
msg_Err( p_condvar->p_this,
"thread %d: cond_destroy failed at %s:%d (%d:%s)",
i_thread, psz_file, i_line, i_result, psz_error );
}
return i_result;
}
/*****************************************************************************
* vlc_thread_create: create a thread, inner version
*****************************************************************************
* Note that i_priority is only taken into account on platforms supporting
* userland real-time priority threads.
*****************************************************************************/
int __vlc_thread_create( vlc_object_t *p_this, char * psz_file, int i_line,
char *psz_name, void * ( *func ) ( void * ),
int i_priority, vlc_bool_t b_wait )
{
int i_ret;
void *p_data;
vlc_mutex_lock( &p_this->object_lock );
#ifdef GPROF
wrapper_t wrapper;
/* Initialize the wrapper structure */
wrapper.func = func;
wrapper.p_data = (void *)p_this;
getitimer( ITIMER_PROF, &wrapper.itimer );
vlc_mutex_init( p_this, &wrapper.lock );
vlc_cond_init( p_this, &wrapper.wait );
vlc_mutex_lock( &wrapper.lock );
/* Alter user-passed data so that we call the wrapper instead
* of the real function */
p_data = &wrapper;
func = vlc_thread_wrapper;
#else
p_data = (void *)p_this;
#endif
#if defined( PTH_INIT_IN_PTH_H )
p_this->thread_id = pth_spawn( PTH_ATTR_DEFAULT, func, p_data );
i_ret = p_this->thread_id == NULL;
#elif defined( ST_INIT_IN_ST_H )
p_this->thread_id = st_thread_create( func, p_data, 1, 0 );
i_ret = 0;
#elif defined( WIN32 ) || defined( UNDER_CE )
{
unsigned threadID;
/* When using the MSVCRT C library you have to use the _beginthreadex
* function instead of CreateThread, otherwise you'll end up with
* memory leaks and the signal functions not working (see Microsoft
* Knowledge Base, article 104641) */
p_this->thread_id =
#if defined( UNDER_CE )
(HANDLE)CreateThread( NULL, 0, (PTHREAD_START) func,
p_data, 0, &threadID );
#else
(HANDLE)_beginthreadex( NULL, 0, (PTHREAD_START) func,
p_data, 0, &threadID );
#endif
}
if ( p_this->thread_id && i_priority )
{
if ( !SetThreadPriority(p_this->thread_id, i_priority) )
{
msg_Warn( p_this, "couldn't set a faster priority" );
i_priority = 0;
}
}
i_ret = ( p_this->thread_id ? 0 : 1 );
#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
i_ret = pthread_create( &p_this->thread_id, NULL, func, p_data );
#ifdef SYS_DARWIN
if ( i_priority )
{
int i_error, i_policy;
struct sched_param param;
memset( ¶m, 0, sizeof(struct sched_param) );
if ( i_priority < 0 )
{
param.sched_priority = (-1) * i_priority;
i_policy = SCHED_OTHER;
}
else
{
param.sched_priority = i_priority;
i_policy = SCHED_RR;
}
if ( (i_error = pthread_setschedparam( p_this->thread_id,
i_policy, ¶m )) )
{
msg_Warn( p_this, "couldn't set thread priority (%s:%d): %s",
psz_file, i_line, strerror(i_error) );
i_priority = 0;
}
}
#endif
#elif defined( HAVE_CTHREADS_H )
p_this->thread_id = cthread_fork( (cthread_fn_t)func, (any_t)p_data );
i_ret = 0;
#elif defined( HAVE_KERNEL_SCHEDULER_H )
p_this->thread_id = spawn_thread( (thread_func)func, psz_name,
i_priority, p_data );
i_ret = resume_thread( p_this->thread_id );
#endif
#ifdef GPROF
if( i_ret == 0 )
{
vlc_cond_wait( &wrapper.wait, &wrapper.lock );
}
vlc_mutex_unlock( &wrapper.lock );
vlc_mutex_destroy( &wrapper.lock );
vlc_cond_destroy( &wrapper.wait );
#endif
if( i_ret == 0 )
{
if( b_wait )
{
msg_Dbg( p_this, "waiting for thread completion" );
vlc_cond_wait( &p_this->object_wait, &p_this->object_lock );
}
p_this->b_thread = 1;
msg_Dbg( p_this, "thread %d (%s) created at priority %d (%s:%d)",
(int)p_this->thread_id, psz_name, i_priority,
psz_file, i_line );
vlc_mutex_unlock( &p_this->object_lock );
}
else
{
#ifdef HAVE_STRERROR
msg_Err( p_this, "%s thread could not be created at %s:%d (%s)",
psz_name, psz_file, i_line, strerror(i_ret) );
#else
msg_Err( p_this, "%s thread could not be created at %s:%d",
psz_name, psz_file, i_line );
#endif
vlc_mutex_unlock( &p_this->object_lock );
}
return i_ret;
}
/*****************************************************************************
* vlc_thread_set_priority: set the priority of the current thread when we
* couldn't set it in vlc_thread_create (for instance for the main thread)
*****************************************************************************/
int __vlc_thread_set_priority( vlc_object_t *p_this, char * psz_file,
int i_line, int i_priority )
{
#if defined( PTH_INIT_IN_PTH_H ) || defined( ST_INIT_IN_ST_H )
#elif defined( WIN32 ) || defined( UNDER_CE )
if ( !SetThreadPriority(GetCurrentThread(), i_priority) )
{
msg_Warn( p_this, "couldn't set a faster priority" );
return 1;
}
#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
#ifdef SYS_DARWIN
if ( i_priority )
{
int i_error, i_policy;
struct sched_param param;
memset( ¶m, 0, sizeof(struct sched_param) );
if ( i_priority < 0 )
{
param.sched_priority = (-1) * i_priority;
i_policy = SCHED_OTHER;
}
else
{
param.sched_priority = i_priority;
i_policy = SCHED_RR;
}
if ( (i_error = pthread_setschedparam( pthread_self(),
i_policy, ¶m )) )
{
msg_Warn( p_this, "couldn't set thread priority (%s:%d): %s",
psz_file, i_line, strerror(i_error) );
i_priority = 0;
}
}
#endif
#endif
return 0;
}
/*****************************************************************************
* vlc_thread_ready: tell the parent thread we were successfully spawned
*****************************************************************************/
void __vlc_thread_ready( vlc_object_t *p_this )
{
vlc_mutex_lock( &p_this->object_lock );
vlc_cond_signal( &p_this->object_wait );
vlc_mutex_unlock( &p_this->object_lock );
}
/*****************************************************************************
* vlc_thread_join: wait until a thread exits, inner version
*****************************************************************************/
void __vlc_thread_join( vlc_object_t *p_this, char * psz_file, int i_line )
{
int i_ret = 0;
#if defined( PTH_INIT_IN_PTH_H )
i_ret = ( pth_join( p_this->thread_id, NULL ) == FALSE );
#elif defined( ST_INIT_IN_ST_H )
i_ret = st_thread_join( p_this->thread_id, NULL );
#elif defined( UNDER_CE )
WaitForSingleObject( p_this->thread_id, INFINITE );
#elif defined( WIN32 )
WaitForSingleObject( p_this->thread_id, INFINITE );
#elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
i_ret = pthread_join( p_this->thread_id, NULL );
#elif defined( HAVE_CTHREADS_H )
cthread_join( p_this->thread_id );
i_ret = 1;
#elif defined( HAVE_KERNEL_SCHEDULER_H )
int32 exit_value;
wait_for_thread( p_this->thread_id, &exit_value );
#endif
if( i_ret )
{
#ifdef HAVE_STRERROR
msg_Err( p_this, "thread_join(%d) failed at %s:%d (%s)",
(int)p_this->thread_id, psz_file, i_line,
strerror(i_ret) );
#else
msg_Err( p_this, "thread_join(%d) failed at %s:%d",
(int)p_this->thread_id, psz_file, i_line );
#endif
}
else
{
msg_Dbg( p_this, "thread %d joined (%s:%d)",
(int)p_this->thread_id, psz_file, i_line );
}
p_this->b_thread = 0;
}
/*****************************************************************************
* vlc_thread_wrapper: wrapper around thread functions used when profiling.
*****************************************************************************/
#ifdef GPROF
static void *vlc_thread_wrapper( void *p_wrapper )
{
/* Put user data in thread-local variables */
void * p_data = ((wrapper_t*)p_wrapper)->p_data;
vlc_thread_func_t func = ((wrapper_t*)p_wrapper)->func;
/* Set the profile timer value */
setitimer( ITIMER_PROF, &((wrapper_t*)p_wrapper)->itimer, NULL );
/* Tell the calling thread that we don't need its data anymore */
vlc_mutex_lock( &((wrapper_t*)p_wrapper)->lock );
vlc_cond_signal( &((wrapper_t*)p_wrapper)->wait );
vlc_mutex_unlock( &((wrapper_t*)p_wrapper)->lock );
/* Call the real function */
return func( p_data );
}
#endif