git.sesse.net Git - vlc/blob - src/misc/threads.c

   1 /*****************************************************************************
   2  * threads.c : threads implementation for the VideoLAN client
   3  *****************************************************************************
   4  * Copyright (C) 1999, 2000, 2001, 2002 VideoLAN
   5  * $Id: threads.c,v 1.13 2002/08/29 23:53:22 massiot Exp $
   6  *
   7  * Authors: Jean-Marc Dressler <polux@via.ecp.fr>
   8  *          Samuel Hocevar <sam@zoy.org>
   9  *          Gildas Bazin <gbazin@netcourrier.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  24  *****************************************************************************/
  25
  26 #include <vlc/vlc.h>
  27
  28 #define VLC_THREADS_UNINITIALIZED  0
  29 #define VLC_THREADS_PENDING        1
  30 #define VLC_THREADS_ERROR          2
  31 #define VLC_THREADS_READY          3
  32
  33 /*****************************************************************************
  34  * Prototype for GPROF wrapper
  35  *****************************************************************************/
  36 #ifdef GPROF
  37 /* Wrapper function for profiling */
  38 static void *      vlc_thread_wrapper ( void *p_wrapper );
  39
  40 #   ifdef WIN32
  41
  42 #       define ITIMER_REAL 1
  43 #       define ITIMER_PROF 2
  44
  45 struct itimerval
  46 {
  47     struct timeval it_value;
  48     struct timeval it_interval;
  49 };
  50
  51 int setitimer(int kind, const struct itimerval* itnew, struct itimerval* itold);
  52 #   endif /* WIN32 */
  53
  54 typedef struct wrapper_t
  55 {
  56     /* Data lock access */
  57     vlc_mutex_t lock;
  58     vlc_cond_t  wait;
  59
  60     /* Data used to spawn the real thread */
  61     vlc_thread_func_t func;
  62     void *p_data;
  63
  64     /* Profiling timer passed to the thread */
  65     struct itimerval itimer;
  66
  67 } wrapper_t;
  68
  69 #endif /* GPROF */
  70
  71 /*****************************************************************************
  72  * Global mutexes for lazy initialization of the threads system
  73  *****************************************************************************/
  74 static volatile int i_initializations = 0;
  75
  76 #if defined( PTH_INIT_IN_PTH_H )
  77     /* Unimplemented */
  78 #elif defined( ST_INIT_IN_ST_H )
  79     /* Unimplemented */
  80 #elif defined( WIN32 )
  81     /* Unimplemented */
  82 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
  83     static pthread_mutex_t once_mutex = PTHREAD_MUTEX_INITIALIZER;
  84 #elif defined( HAVE_CTHREADS_H )
  85     /* Unimplemented */
  86 #elif defined( HAVE_KERNEL_SCHEDULER_H )
  87     /* Unimplemented */
  88 #endif
  89
  90 /*****************************************************************************
  91  * vlc_threads_init: initialize threads system
  92  *****************************************************************************
  93  * This function requires lazy initialization of a global lock in order to
  94  * keep the library really thread-safe. Some architectures don't support this
  95  * and thus do not guarantee the complete reentrancy.
  96  *****************************************************************************/
  97 int __vlc_threads_init( vlc_object_t *p_this )
  98 {
  99     static volatile int i_status = VLC_THREADS_UNINITIALIZED;
 100     int i_ret = 0;
 101
 102 #if defined( PTH_INIT_IN_PTH_H )
 103     /* Unimplemented */
 104 #elif defined( ST_INIT_IN_ST_H )
 105     /* Unimplemented */
 106 #elif defined( WIN32 )
 107     /* Unimplemented */
 108 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 109     pthread_mutex_lock( &once_mutex );
 110 #elif defined( HAVE_CTHREADS_H )
 111     /* Unimplemented */
 112 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 113     /* Unimplemented */
 114 #endif
 115
 116     if( i_status == VLC_THREADS_UNINITIALIZED )
 117     {
 118         i_status = VLC_THREADS_PENDING;
 119
 120 #if defined( PTH_INIT_IN_PTH_H )
 121         i_ret = pth_init();
 122 #elif defined( ST_INIT_IN_ST_H )
 123         i_ret = st_init();
 124 #elif defined( WIN32 )
 125         /* Unimplemented */
 126 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 127         /* Unimplemented */
 128 #elif defined( HAVE_CTHREADS_H )
 129         /* Unimplemented */
 130 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 131         /* Unimplemented */
 132 #endif
 133
 134         if( i_ret )
 135         {
 136             i_status = VLC_THREADS_ERROR;
 137         }
 138         else
 139         {
 140             vlc_mutex_init( p_this, p_this->p_vlc->p_global_lock );
 141             i_status = VLC_THREADS_READY;
 142         }
 143     }
 144     else
 145     {
 146         i_ret = ( i_status == VLC_THREADS_READY );
 147     }
 148
 149     i_initializations++;
 150
 151 #if defined( PTH_INIT_IN_PTH_H )
 152     /* Unimplemented */
 153 #elif defined( ST_INIT_IN_ST_H )
 154     /* Unimplemented */
 155 #elif defined( WIN32 )
 156     /* Unimplemented */
 157 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 158     pthread_mutex_unlock( &once_mutex );
 159     return i_ret;
 160 #elif defined( HAVE_CTHREADS_H )
 161     /* Unimplemented */
 162 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 163     /* Unimplemented */
 164 #endif
 165
 166     /* Wait until the other thread has initialized the thread library */
 167     while( i_status == VLC_THREADS_PENDING )
 168     {
 169         msleep( THREAD_SLEEP );
 170     }
 171
 172     return i_status == VLC_THREADS_READY;
 173 }
 174
 175 /*****************************************************************************
 176  * vlc_threads_end: stop threads system
 177  *****************************************************************************
 178  * FIXME: This function is far from being threadsafe. We should undo exactly
 179  * what we did above in vlc_threads_init.
 180  *****************************************************************************/
 181 int __vlc_threads_end( vlc_object_t *p_this )
 182 {
 183 #if defined( PTH_INIT_IN_PTH_H )
 184     i_initializations--;
 185     if( i_initializations == 0 )
 186     {
 187         return pth_kill();
 188     }
 189     return 0;
 190
 191 #elif defined( ST_INIT_IN_ST_H )
 192     i_initializations--;
 193     return 0;
 194
 195 #elif defined( WIN32 )
 196     i_initializations--;
 197     return 0;
 198
 199 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 200     pthread_mutex_lock( &once_mutex );
 201     i_initializations--;
 202     pthread_mutex_unlock( &once_mutex );
 203     return 0;
 204
 205 #elif defined( HAVE_CTHREADS_H )
 206     i_initializations--;
 207     return 0;
 208
 209 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 210     i_initializations--;
 211     return 0;
 212
 213 #endif
 214 }
 215
 216 /*****************************************************************************
 217  * vlc_mutex_init: initialize a mutex
 218  *****************************************************************************/
 219 int __vlc_mutex_init( vlc_object_t *p_this, vlc_mutex_t *p_mutex )
 220 {
 221     p_mutex->p_this = p_this;
 222
 223 #if defined( PTH_INIT_IN_PTH_H )
 224     return pth_mutex_init( &p_mutex->mutex );
 225
 226 #elif defined( ST_INIT_IN_ST_H )
 227     *p_mutex->mutex = st_mutex_new();
 228     return ( *p_mutex == NULL ) ? errno : 0;
 229
 230 #elif defined( WIN32 )
 231     /* We use mutexes on WinNT/2K/XP because we can use the SignalObjectAndWait
 232      * function and have a 100% correct vlc_cond_wait() implementation.
 233      * As this function is not available on Win9x, we can use the faster
 234      * CriticalSections */
 235     if( p_this->p_vlc->SignalObjectAndWait && !p_this->p_vlc->b_fast_mutex )
 236     {
 237         /* We are running on NT/2K/XP, we can use SignalObjectAndWait */
 238         p_mutex->mutex = CreateMutex( 0, FALSE, 0 );
 239         return ( p_mutex->mutex != NULL ? 0 : 1 );
 240     }
 241     else
 242     {
 243         p_mutex->mutex = NULL;
 244         InitializeCriticalSection( &p_mutex->csection );
 245         return 0;
 246     }
 247
 248 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 249 #   if defined(DEBUG) && defined(SYS_LINUX)
 250     {
 251         /* Create error-checking mutex to detect problems more easily. */
 252         pthread_mutexattr_t attr;
 253         int                 i_result;
 254
 255         pthread_mutexattr_init( &attr );
 256         pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_ERRORCHECK_NP );
 257         i_result = pthread_mutex_init( p_mutex, &attr );
 258         pthread_mutexattr_destroy( &attr );
 259         return( i_result );
 260     }
 261 #   endif
 262     return pthread_mutex_init( &p_mutex->mutex, NULL );
 263
 264 #elif defined( HAVE_CTHREADS_H )
 265     mutex_init( p_mutex );
 266     return 0;
 267
 268 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 269     /* check the arguments and whether it's already been initialized */
 270     if( p_mutex == NULL )
 271     {
 272         return B_BAD_VALUE;
 273     }
 274
 275     if( p_mutex->init == 9999 )
 276     {
 277         return EALREADY;
 278     }
 279
 280     p_mutex->lock = create_sem( 1, "BeMutex" );
 281     if( p_mutex->lock < B_NO_ERROR )
 282     {
 283         return( -1 );
 284     }
 285
 286     p_mutex->init = 9999;
 287     return B_OK;
 288
 289 #endif
 290 }
 291
 292 /*****************************************************************************
 293  * vlc_mutex_destroy: destroy a mutex, inner version
 294  *****************************************************************************/
 295 int __vlc_mutex_destroy( char * psz_file, int i_line, vlc_mutex_t *p_mutex )
 296 {
 297     int i_result;
 298     /* In case of error : */
 299     int i_thread = -1;
 300     const char * psz_error = "";
 301
 302 #if defined( PTH_INIT_IN_PTH_H )
 303     return 0;
 304
 305 #elif defined( ST_INIT_IN_ST_H )
 306     i_result = st_mutex_destroy( *p_mutex );
 307
 308 #elif defined( WIN32 )
 309     if( p_mutex->mutex )
 310     {
 311         CloseHandle( p_mutex->mutex );
 312     }
 313     else
 314     {
 315         DeleteCriticalSection( &p_mutex->csection );
 316     }
 317     return 0;
 318
 319 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 320     i_result = pthread_mutex_destroy( &p_mutex->mutex );
 321     if ( i_result )
 322     {
 323         i_thread = pthread_self();
 324         psz_error = strerror(i_result);
 325     }
 326
 327 #elif defined( HAVE_CTHREADS_H )
 328     return 0;
 329
 330 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 331     if( p_mutex->init == 9999 )
 332     {
 333         delete_sem( p_mutex->lock );
 334     }
 335
 336     p_mutex->init = 0;
 337     return B_OK;
 338 #endif
 339
 340     if( i_result )
 341     {
 342         msg_Err( p_mutex->p_this,
 343                  "thread %d: mutex_destroy failed at %s:%d (%d:%s)",
 344                  i_thread, psz_file, i_line, i_result, psz_error );
 345     }
 346     return i_result;
 347 }
 348
 349 /*****************************************************************************
 350  * vlc_cond_init: initialize a condition
 351  *****************************************************************************/
 352 int __vlc_cond_init( vlc_object_t *p_this, vlc_cond_t *p_condvar )
 353 {
 354     p_condvar->p_this = p_this;
 355
 356 #if defined( PTH_INIT_IN_PTH_H )
 357     return pth_cond_init( &p_condvar->cond );
 358
 359 #elif defined( ST_INIT_IN_ST_H )
 360     *p_condvar->cond = st_cond_new();
 361     return ( *p_condvar->cond == NULL ) ? errno : 0;
 362
 363 #elif defined( WIN32 )
 364     /* Initialize counter */
 365     p_condvar->i_waiting_threads = 0;
 366
 367     /* Misc init */
 368     p_condvar->i_win9x_cv = p_this->p_vlc->i_win9x_cv;
 369     p_condvar->SignalObjectAndWait = p_this->p_vlc->SignalObjectAndWait;
 370
 371     if( p_this->p_vlc->i_win9x_cv == 0 )
 372     {
 373         /* Create an auto-reset event. */
 374         p_condvar->event = CreateEvent( NULL,   /* no security */
 375                                         FALSE,  /* auto-reset event */
 376                                         FALSE,  /* start non-signaled */
 377                                         NULL ); /* unnamed */
 378
 379         p_condvar->semaphore = NULL;
 380         return !p_condvar->event;
 381     }
 382     else
 383     {
 384         p_condvar->semaphore = CreateSemaphore( NULL,       /* no security */
 385                                                 0,          /* initial count */
 386                                                 0x7fffffff, /* max count */
 387                                                 NULL );     /* unnamed */
 388
 389         if( p_this->p_vlc->i_win9x_cv == 1 )
 390             /* Create a manual-reset event initially signaled. */
 391             p_condvar->event = CreateEvent( NULL, TRUE, TRUE, NULL );
 392         else
 393             /* Create a auto-reset event. */
 394             p_condvar->event = CreateEvent( NULL, FALSE, FALSE, NULL );
 395
 396         InitializeCriticalSection( &p_condvar->csection );
 397
 398         return !p_condvar->semaphore || !p_condvar->event;
 399     }
 400
 401 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 402     return pthread_cond_init( &p_condvar->cond, NULL );
 403
 404 #elif defined( HAVE_CTHREADS_H )
 405     /* condition_init() */
 406     spin_lock_init( &p_condvar->lock );
 407     cthread_queue_init( &p_condvar->queue );
 408     p_condvar->name = 0;
 409     p_condvar->implications = 0;
 410
 411     return 0;
 412
 413 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 414     if( !p_condvar )
 415     {
 416         return B_BAD_VALUE;
 417     }
 418
 419     if( p_condvar->init == 9999 )
 420     {
 421         return EALREADY;
 422     }
 423
 424     p_condvar->thread = -1;
 425     p_condvar->init = 9999;
 426     return 0;
 427 #endif
 428 }
 429
 430 /*****************************************************************************
 431  * vlc_cond_destroy: destroy a condition, inner version
 432  *****************************************************************************/
 433 int __vlc_cond_destroy( char * psz_file, int i_line, vlc_cond_t *p_condvar )
 434 {
 435     int i_result;
 436     /* In case of error : */
 437     int i_thread = -1;
 438     const char * psz_error = "";
 439
 440 #if defined( PTH_INIT_IN_PTH_H )
 441     return 0;
 442
 443 #elif defined( ST_INIT_IN_ST_H )
 444     i_result = st_cond_destroy( *p_condvar->cond );
 445
 446 #elif defined( WIN32 )
 447     if( !p_condvar->semaphore )
 448         i_result = !CloseHandle( p_condvar->event );
 449     else
 450         i_result = !CloseHandle( p_condvar->event )
 451           || !CloseHandle( p_condvar->semaphore );
 452
 453 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 454     i_result = pthread_cond_destroy( &p_condvar->cond );
 455     if ( i_result )
 456     {
 457         i_thread = pthread_self();
 458         psz_error = strerror(i_result);
 459     }
 460
 461 #elif defined( HAVE_CTHREADS_H )
 462     return 0;
 463
 464 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 465     p_condvar->init = 0;
 466     return 0;
 467 #endif
 468
 469     if( i_result )
 470     {
 471         msg_Err( p_condvar->p_this,
 472                  "thread %d: cond_destroy failed at %s:%d (%d:%s)",
 473                  i_thread, psz_file, i_line, i_result, psz_error );
 474     }
 475     return i_result;
 476 }
 477
 478 /*****************************************************************************
 479  * vlc_thread_create: create a thread, inner version
 480  *****************************************************************************
 481  * Note that i_priority is only taken into account on platforms supporting
 482  * userland real-time priority threads.
 483  *****************************************************************************/
 484 int __vlc_thread_create( vlc_object_t *p_this, char * psz_file, int i_line,
 485                          char *psz_name, void * ( *func ) ( void * ),
 486                          int i_priority, vlc_bool_t b_wait )
 487 {
 488     int i_ret;
 489
 490     vlc_mutex_lock( &p_this->object_lock );
 491
 492 #ifdef GPROF
 493     wrapper_t wrapper;
 494
 495     /* Initialize the wrapper structure */
 496     wrapper.func = func;
 497     wrapper.p_data = (void *)p_this;
 498     getitimer( ITIMER_PROF, &wrapper.itimer );
 499     vlc_mutex_init( p_this, &wrapper.lock );
 500     vlc_cond_init( p_this, &wrapper.wait );
 501     vlc_mutex_lock( &wrapper.lock );
 502
 503     /* Alter user-passed data so that we call the wrapper instead
 504      * of the real function */
 505     p_data = &wrapper;
 506     func = vlc_thread_wrapper;
 507 #endif
 508
 509 #if defined( PTH_INIT_IN_PTH_H )
 510     p_this->thread_id = pth_spawn( PTH_ATTR_DEFAULT, func, (void *)p_this );
 511     i_ret = 0;
 512
 513 #elif defined( ST_INIT_IN_ST_H )
 514     p_this->thread_id = st_thread_create( func, (void *)p_this, 1, 0 );
 515     i_ret = 0;
 516
 517 #elif defined( WIN32 )
 518     {
 519         unsigned threadID;
 520         /* When using the MSVCRT C library you have to use the _beginthreadex
 521          * function instead of CreateThread, otherwise you'll end up with
 522          * memory leaks and the signal functions not working */
 523         p_this->thread_id =
 524                 (HANDLE)_beginthreadex( NULL, 0, (PTHREAD_START) func,
 525                                         (void *)p_this, 0, &threadID );
 526     }
 527
 528     if ( p_this->thread_id && i_priority )
 529     {
 530         if ( !SetThreadPriority(p_this->thread_id, i_priority) )
 531         {
 532             msg_Warn( p_this, "couldn't set a faster priority" );
 533             i_priority = 0;
 534         }
 535     }
 536
 537     i_ret = ( p_this->thread_id ? 0 : 1 );
 538
 539 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 540     i_ret = pthread_create( &p_this->thread_id, NULL, func, (void *)p_this );
 541
 542     if ( i_priority )
 543     {
 544         struct sched_param param;
 545         memset( &param, 0, sizeof(struct sched_param) );
 546         param.sched_priority = i_priority;
 547         if ( pthread_setschedparam( p_this->thread_id, SCHED_RR, &param ) )
 548         {
 549             msg_Warn( p_this, "couldn't go to real-time priority" );
 550             i_priority = 0;
 551         }
 552     }
 553
 554 #elif defined( HAVE_CTHREADS_H )
 555     p_this->thread_id = cthread_fork( (cthread_fn_t)func, (any_t)p_this );
 556     i_ret = 0;
 557
 558 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 559     p_this->thread_id = spawn_thread( (thread_func)func, psz_name,
 560                                       B_NORMAL_PRIORITY, (void *)p_this );
 561     i_ret = resume_thread( p_this->thread_id );
 562
 563 #endif
 564
 565 #ifdef GPROF
 566     if( i_ret == 0 )
 567     {
 568         vlc_cond_wait( &wrapper.wait, &wrapper.lock );
 569     }
 570
 571     vlc_mutex_unlock( &wrapper.lock );
 572     vlc_mutex_destroy( &wrapper.lock );
 573     vlc_cond_destroy( &wrapper.wait );
 574 #endif
 575
 576     if( i_ret == 0 )
 577     {
 578         if( b_wait )
 579         {
 580             msg_Dbg( p_this, "waiting for thread completion" );
 581             vlc_cond_wait( &p_this->object_wait, &p_this->object_lock );
 582         }
 583
 584         p_this->b_thread = 1;
 585
 586         msg_Dbg( p_this, "thread %d (%s) created at priority %d (%s:%d)",
 587                  p_this->thread_id, psz_name, i_priority,
 588                  psz_file, i_line );
 589
 590         vlc_mutex_unlock( &p_this->object_lock );
 591     }
 592     else
 593     {
 594         msg_Err( p_this, "%s thread could not be created at %s:%d (%s)",
 595                          psz_name, psz_file, i_line, strerror(i_ret) );
 596         vlc_mutex_unlock( &p_this->object_lock );
 597     }
 598
 599     return i_ret;
 600 }
 601
 602 /*****************************************************************************
 603  * vlc_thread_ready: tell the parent thread we were successfully spawned
 604  *****************************************************************************/
 605 void __vlc_thread_ready( vlc_object_t *p_this )
 606 {
 607     vlc_mutex_lock( &p_this->object_lock );
 608     vlc_cond_signal( &p_this->object_wait );
 609     vlc_mutex_unlock( &p_this->object_lock );
 610 }
 611
 612 /*****************************************************************************
 613  * vlc_thread_join: wait until a thread exits, inner version
 614  *****************************************************************************/
 615 void __vlc_thread_join( vlc_object_t *p_this, char * psz_file, int i_line )
 616 {
 617     int i_ret = 0;
 618
 619 #if defined( PTH_INIT_IN_PTH_H )
 620     i_ret = pth_join( p_this->thread_id, NULL );
 621
 622 #elif defined( ST_INIT_IN_ST_H )
 623     i_ret = st_thread_join( p_this->thread_id, NULL );
 624
 625 #elif defined( WIN32 )
 626     WaitForSingleObject( p_this->thread_id, INFINITE );
 627
 628 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 629     i_ret = pthread_join( p_this->thread_id, NULL );
 630
 631 #elif defined( HAVE_CTHREADS_H )
 632     cthread_join( p_this->thread_id );
 633     i_ret = 1;
 634
 635 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 636     int32 exit_value;
 637     wait_for_thread( p_this->thread_id, &exit_value );
 638
 639 #endif
 640
 641     if( i_ret )
 642     {
 643         msg_Err( p_this, "thread_join(%d) failed at %s:%d (%s)",
 644                          p_this->thread_id, psz_file, i_line, strerror(i_ret) );
 645     }
 646     else
 647     {
 648         msg_Dbg( p_this, "thread %d joined (%s:%d)",
 649                          p_this->thread_id, psz_file, i_line );
 650     }
 651
 652     p_this->b_thread = 0;
 653 }
 654
 655 /*****************************************************************************
 656  * vlc_thread_wrapper: wrapper around thread functions used when profiling.
 657  *****************************************************************************/
 658 #ifdef GPROF
 659 static void *vlc_thread_wrapper( void *p_wrapper )
 660 {
 661     /* Put user data in thread-local variables */
 662     void *            p_data = ((wrapper_t*)p_wrapper)->p_data;
 663     vlc_thread_func_t func   = ((wrapper_t*)p_wrapper)->func;
 664
 665     /* Set the profile timer value */
 666     setitimer( ITIMER_PROF, &((wrapper_t*)p_wrapper)->itimer, NULL );
 667
 668     /* Tell the calling thread that we don't need its data anymore */
 669     vlc_mutex_lock( &((wrapper_t*)p_wrapper)->lock );
 670     vlc_cond_signal( &((wrapper_t*)p_wrapper)->wait );
 671     vlc_mutex_unlock( &((wrapper_t*)p_wrapper)->lock );
 672
 673     /* Call the real function */
 674     return func( p_data );
 675 }
 676 #endif