git.sesse.net Git - vlc/blob - include/vlc_threads_funcs.h

   1 /*****************************************************************************
   2  * vlc_threads_funcs.h : threads implementation for the VideoLAN client
   3  * This header provides a portable threads implementation.
   4  *****************************************************************************
   5  * Copyright (C) 1999, 2002 VideoLAN
   6  * $Id: vlc_threads_funcs.h,v 1.1 2002/08/29 23:53:22 massiot Exp $
   7  *
   8  * Authors: Jean-Marc Dressler <polux@via.ecp.fr>
   9  *          Samuel Hocevar <sam@via.ecp.fr>
  10  *          Gildas Bazin <gbazin@netcourrier.com>
  11  *          Christophe Massiot <massiot@via.ecp.fr>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  26  *****************************************************************************/
  27
  28 /*****************************************************************************
  29  * Function definitions
  30  *****************************************************************************/
  31 VLC_EXPORT( int,  __vlc_threads_init,  ( vlc_object_t * ) );
  32 VLC_EXPORT( int,  __vlc_threads_end,   ( vlc_object_t * ) );
  33 VLC_EXPORT( int,  __vlc_mutex_init,    ( vlc_object_t *, vlc_mutex_t * ) );
  34 VLC_EXPORT( int,  __vlc_mutex_destroy, ( char *, int, vlc_mutex_t * ) );
  35 VLC_EXPORT( int,  __vlc_cond_init,     ( vlc_object_t *, vlc_cond_t * ) );
  36 VLC_EXPORT( int,  __vlc_cond_destroy,  ( char *, int, vlc_cond_t * ) );
  37 VLC_EXPORT( int,  __vlc_thread_create, ( vlc_object_t *, char *, int, char *, void * ( * ) ( void * ), int, vlc_bool_t ) );
  38 VLC_EXPORT( void, __vlc_thread_ready,  ( vlc_object_t * ) );
  39 VLC_EXPORT( void, __vlc_thread_join,   ( vlc_object_t *, char *, int ) );
  40
  41 /*****************************************************************************
  42  * vlc_threads_init: initialize threads system
  43  *****************************************************************************/
  44 #define vlc_threads_init( P_THIS )                                          \
  45     __vlc_threads_init( VLC_OBJECT(P_THIS) )
  46
  47 /*****************************************************************************
  48  * vlc_threads_end: deinitialize threads system
  49  *****************************************************************************/
  50 #define vlc_threads_end( P_THIS )                                           \
  51     __vlc_threads_end( VLC_OBJECT(P_THIS) )
  52
  53 /*****************************************************************************
  54  * vlc_mutex_init: initialize a mutex
  55  *****************************************************************************/
  56 #define vlc_mutex_init( P_THIS, P_MUTEX )                                   \
  57     __vlc_mutex_init( VLC_OBJECT(P_THIS), P_MUTEX )
  58
  59 /*****************************************************************************
  60  * vlc_mutex_lock: lock a mutex
  61  *****************************************************************************/
  62 #define vlc_mutex_lock( P_MUTEX )                                           \
  63     __vlc_mutex_lock( __FILE__, __LINE__, P_MUTEX )
  64
  65 static inline int __vlc_mutex_lock( char * psz_file, int i_line,
  66                                     vlc_mutex_t * p_mutex )
  67 {
  68     int i_result;
  69     /* In case of error : */
  70     int i_thread = -1;
  71     const char * psz_error = "";
  72
  73 #if defined( PTH_INIT_IN_PTH_H )
  74     i_result = pth_mutex_acquire( &p_mutex->mutex, TRUE, NULL );
  75
  76 #elif defined( ST_INIT_IN_ST_H )
  77     i_result = st_mutex_lock( *p_mutex->mutex );
  78
  79 #elif defined( WIN32 )
  80     if( p_mutex->mutex )
  81     {
  82         WaitForSingleObject( p_mutex->mutex, INFINITE );
  83     }
  84     else
  85     {
  86         EnterCriticalSection( &p_mutex->csection );
  87     }
  88     return 0;
  89
  90 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
  91     i_result = pthread_mutex_lock( &p_mutex->mutex );
  92     if ( i_result )
  93     {
  94         i_thread = (int)pthread_self();
  95         psz_error = strerror(i_result);
  96     }
  97
  98 #elif defined( HAVE_CTHREADS_H )
  99     mutex_lock( p_mutex->mutex );
 100     return 0;
 101
 102 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 103     if( p_mutex == NULL )
 104     {
 105         i_result = B_BAD_VALUE;
 106     }
 107     else if( p_mutex->init < 2000 )
 108     {
 109         i_result = B_NO_INIT;
 110     }
 111     else
 112     {
 113         i_result = acquire_sem( p_mutex->lock );
 114     }
 115 #endif
 116
 117     if( i_result )
 118     {
 119         msg_Err( p_mutex->p_this,
 120                  "thread %d: mutex_lock failed at %s:%d (%d:%s)",
 121                  i_thread, psz_file, i_line, i_result, psz_error );
 122     }
 123     return i_result;
 124 }
 125
 126 /*****************************************************************************
 127  * vlc_mutex_unlock: unlock a mutex
 128  *****************************************************************************/
 129 #define vlc_mutex_unlock( P_MUTEX )                                         \
 130     __vlc_mutex_unlock( __FILE__, __LINE__, P_MUTEX )
 131
 132 static inline int __vlc_mutex_unlock( char * psz_file, int i_line,
 133                                       vlc_mutex_t *p_mutex )
 134 {
 135     int i_result;
 136     /* In case of error : */
 137     int i_thread = -1;
 138     const char * psz_error = "";
 139
 140 #if defined( PTH_INIT_IN_PTH_H )
 141     i_result = pth_mutex_release( &p_mutex->mutex );
 142
 143 #elif defined( ST_INIT_IN_ST_H )
 144     i_result = st_mutex_unlock( *p_mutex->mutex );
 145
 146 #elif defined( WIN32 )
 147     if( p_mutex->mutex )
 148     {
 149         ReleaseMutex( p_mutex->mutex );
 150     }
 151     else
 152     {
 153         LeaveCriticalSection( &p_mutex->csection );
 154     }
 155     return 0;
 156
 157 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 158     i_result = pthread_mutex_unlock( &p_mutex->mutex );
 159     if ( i_result )
 160     {
 161         i_thread = (int)pthread_self();
 162         psz_error = strerror(i_result);
 163     }
 164
 165 #elif defined( HAVE_CTHREADS_H )
 166     mutex_unlock( p_mutex );
 167     return 0;
 168
 169 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 170     if( p_mutex == NULL )
 171     {
 172         i_result = B_BAD_VALUE;
 173     }
 174     else if( p_mutex->init < 2000 )
 175     {
 176         i_result = B_NO_INIT;
 177     }
 178     else
 179     {
 180         release_sem( p_mutex->lock );
 181         return B_OK;
 182     }
 183 #endif
 184
 185     if( i_result )
 186     {
 187         msg_Err( p_mutex->p_this,
 188                  "thread %d: mutex_unlock failed at %s:%d (%d:%s)",
 189                  i_thread, psz_file, i_line, i_result, psz_error );
 190     }
 191
 192     return i_result;
 193 }
 194
 195 /*****************************************************************************
 196  * vlc_mutex_destroy: destroy a mutex
 197  *****************************************************************************/
 198 #define vlc_mutex_destroy( P_MUTEX )                                        \
 199     __vlc_mutex_destroy( __FILE__, __LINE__, P_MUTEX )
 200
 201 /*****************************************************************************
 202  * vlc_cond_init: initialize a condition
 203  *****************************************************************************/
 204 #define vlc_cond_init( P_THIS, P_COND )                                     \
 205     __vlc_cond_init( VLC_OBJECT(P_THIS), P_COND )
 206
 207 /*****************************************************************************
 208  * vlc_cond_signal: start a thread on condition completion
 209  *****************************************************************************/
 210 #define vlc_cond_signal( P_COND )                                           \
 211     __vlc_cond_signal( __FILE__, __LINE__, P_COND )
 212
 213 static inline int __vlc_cond_signal( char * psz_file, int i_line,
 214                                      vlc_cond_t *p_condvar )
 215 {
 216     int i_result;
 217     /* In case of error : */
 218     int i_thread = -1;
 219     const char * psz_error = "";
 220
 221 #if defined( PTH_INIT_IN_PTH_H )
 222     i_result = pth_cond_notify( &p_condvar->cond, FALSE );
 223
 224 #elif defined( ST_INIT_IN_ST_H )
 225     i_result = st_cond_signal( *p_condvar->cond );
 226
 227 #elif defined( WIN32 )
 228     /* Release one waiting thread if one is available. */
 229     /* For this trick to work properly, the vlc_cond_signal must be surrounded
 230      * by a mutex. This will prevent another thread from stealing the signal */
 231     if( !p_condvar->semaphore )
 232     {
 233         PulseEvent( p_condvar->event );
 234     }
 235     else if( p_condvar->i_win9x_cv == 1 )
 236     {
 237         /* Wait for the gate to be open */
 238         WaitForSingleObject( p_condvar->event, INFINITE );
 239
 240         if( p_condvar->i_waiting_threads )
 241         {
 242             /* Using a semaphore exposes us to a race condition. It is
 243              * possible for another thread to start waiting on the semaphore
 244              * just after we signaled it and thus steal the signal.
 245              * We have to prevent new threads from entering the cond_wait(). */
 246             ResetEvent( p_condvar->event );
 247
 248             /* A semaphore is used here because Win9x doesn't have
 249              * SignalObjectAndWait() and thus a race condition exists
 250              * during the time we release the mutex and the time we start
 251              * waiting on the event (more precisely, the signal can sometimes
 252              * be missed by the waiting thread if we use PulseEvent()). */
 253             ReleaseSemaphore( p_condvar->semaphore, 1, 0 );
 254         }
 255     }
 256     else
 257     {
 258         if( p_condvar->i_waiting_threads )
 259         {
 260             ReleaseSemaphore( p_condvar->semaphore, 1, 0 );
 261
 262             /* Wait for the last thread to be awakened */
 263             WaitForSingleObject( p_condvar->event, INFINITE );
 264         }
 265     }
 266     return 0;
 267
 268 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 269     i_result = pthread_cond_signal( &p_condvar->cond );
 270     if ( i_result )
 271     {
 272         i_thread = (int)pthread_self();
 273         psz_error = strerror(i_result);
 274     }
 275
 276 #elif defined( HAVE_CTHREADS_H )
 277     /* condition_signal() */
 278     if ( p_condvar->queue.head || p_condvar->implications )
 279     {
 280         cond_signal( (condition_t)p_condvar );
 281     }
 282     return 0;
 283
 284 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 285     if( p_condvar == NULL )
 286     {
 287         i_result = B_BAD_VALUE;
 288     }
 289     else if( p_condvar->init < 2000 )
 290     {
 291         i_result = B_NO_INIT;
 292     }
 293     else
 294     {
 295         while( p_condvar->thread != -1 )
 296         {
 297             thread_info info;
 298             if( get_thread_info(p_condvar->thread, &info) == B_BAD_VALUE )
 299             {
 300                 return 0;
 301             }
 302
 303             if( info.state != B_THREAD_SUSPENDED )
 304             {
 305                 /* The  waiting thread is not suspended so it could
 306                  * have been interrupted beetwen the unlock and the
 307                  * suspend_thread line. That is why we sleep a little
 308                  * before retesting p_condver->thread. */
 309                 snooze( 10000 );
 310             }
 311             else
 312             {
 313                 /* Ok, we have to wake up that thread */
 314                 resume_thread( p_condvar->thread );
 315                 return 0;
 316             }
 317         }
 318     }
 319 #endif
 320
 321     if( i_result )
 322     {
 323         msg_Err( p_condvar->p_this,
 324                  "thread %d: cond_signal failed at %s:%d (%d:%s)",
 325                  i_thread, psz_file, i_line, i_result, psz_error );
 326     }
 327
 328     return i_result;
 329 }
 330
 331 /*****************************************************************************
 332  * vlc_cond_broadcast: start all threads waiting on condition completion
 333  *****************************************************************************/
 334 /*
 335  * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
 336  * Only works with pthreads, st, win32
 337  * You need to adapt it for others
 338  * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
 339  */
 340 #define vlc_cond_broadcast( P_COND )                                        \
 341     __vlc_cond_broadcast( __FILE__, __LINE__, P_COND )
 342
 343 static inline int __vlc_cond_broadcast( char * psz_file, int i_line,
 344                                         vlc_cond_t *p_condvar )
 345 {
 346     int i_result;
 347     /* In case of error : */
 348     int i_thread = -1;
 349     const char * psz_error = "";
 350
 351 #if defined( PTH_INIT_IN_PTH_H )
 352     i_result = pth_cond_notify( &p_condvar->cond, FALSE );
 353
 354 #elif defined( ST_INIT_IN_ST_H )
 355     i_result = st_cond_broadcast( *p_condvar->cond );
 356
 357 #elif defined( WIN32 )
 358     /* Release all waiting threads. */
 359     if( !p_condvar->semaphore )
 360     {
 361         for( i = p_condvar->i_waiting_threads; i > 0; i-- )
 362         {
 363             PulseEvent( p_condvar->event );
 364         }
 365     }
 366     else if( p_condvar->i_win9x_cv == 1 )
 367     {
 368         /* Wait for the gate to be open */
 369         WaitForSingleObject( p_condvar->event, INFINITE );
 370
 371         if( p_condvar->i_waiting_threads )
 372         {
 373             /* Using a semaphore exposes us to a race condition. It is
 374              * possible for another thread to start waiting on the semaphore
 375              * just after we signaled it and thus steal the signal.
 376              * We have to prevent new threads from entering the cond_wait(). */
 377             ResetEvent( p_condvar->event );
 378
 379             /* A semaphore is used here because Win9x doesn't have
 380              * SignalObjectAndWait() and thus a race condition exists
 381              * during the time we release the mutex and the time we start
 382              * waiting on the event (more precisely, the signal can sometimes
 383              * be missed by the waiting thread if we use PulseEvent()). */
 384             ReleaseSemaphore( p_condvar->semaphore,
 385                               p_condvar->i_waiting_threads, 0 );
 386         }
 387     }
 388     else
 389     {
 390         if( p_condvar->i_waiting_threads )
 391         {
 392             ReleaseSemaphore( p_condvar->semaphore,
 393                               p_condvar->i_waiting_threads, 0 );
 394
 395             /* Wait for the last thread to be awakened */
 396             WaitForSingleObject( p_condvar->event, INFINITE );
 397         }
 398     }
 399     return 0;
 400
 401 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 402     i_result = pthread_cond_broadcast( &p_condvar->cond );
 403     if ( i_result )
 404     {
 405         i_thread = (int)pthread_self();
 406         psz_error = strerror(i_result);
 407     }
 408
 409 #elif defined( HAVE_CTHREADS_H )
 410     /* condition_signal() */
 411     if ( p_condvar->queue.head || p_condvar->implications )
 412     {
 413         cond_signal( (condition_t)p_condvar );
 414     }
 415     return 0;
 416
 417 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 418     if( p_condvar == NULL )
 419     {
 420         i_result = B_BAD_VALUE;
 421     }
 422     else if( p_condvar->init < 2000 )
 423     {
 424         i_result = B_NO_INIT;
 425     }
 426     else
 427     {
 428         while( p_condvar->thread != -1 )
 429         {
 430             thread_info info;
 431             if( get_thread_info(p_condvar->thread, &info) == B_BAD_VALUE )
 432             {
 433                 return 0;
 434             }
 435
 436             if( info.state != B_THREAD_SUSPENDED )
 437             {
 438                 /* The  waiting thread is not suspended so it could
 439                  * have been interrupted beetwen the unlock and the
 440                  * suspend_thread line. That is why we sleep a little
 441                  * before retesting p_condver->thread. */
 442                 snooze( 10000 );
 443             }
 444             else
 445             {
 446                 /* Ok, we have to wake up that thread */
 447                 resume_thread( p_condvar->thread );
 448                 return 0;
 449             }
 450         }
 451     }
 452 #endif
 453
 454     if( i_result )
 455     {
 456         msg_Err( p_condvar->p_this,
 457                  "thread %d: cond_broadcast failed at %s:%d (%d:%s)",
 458                  i_thread, psz_file, i_line, i_result, psz_error );
 459     }
 460
 461     return i_result;
 462 }
 463
 464 /*****************************************************************************
 465  * vlc_cond_wait: wait until condition completion
 466  *****************************************************************************/
 467 #define vlc_cond_wait( P_COND, P_MUTEX )                                     \
 468     __vlc_cond_wait( __FILE__, __LINE__, P_COND, P_MUTEX  )
 469
 470 static inline int __vlc_cond_wait( char * psz_file, int i_line,
 471                                    vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex )
 472 {
 473     int i_result;
 474     /* In case of error : */
 475     int i_thread = -1;
 476     const char * psz_error = "";
 477
 478 #if defined( PTH_INIT_IN_PTH_H )
 479     i_result = pth_cond_await( &p_condvar->cond, &p_mutex->mutex, NULL );
 480
 481 #elif defined( ST_INIT_IN_ST_H )
 482     st_mutex_unlock( *p_mutex->mutex );
 483     i_result = st_cond_wait( *p_condvar->cond );
 484     st_mutex_lock( *p_mutex->mutex );
 485
 486 #elif defined( WIN32 )
 487     if( !p_condvar->semaphore )
 488     {
 489         /* Increase our wait count */
 490         p_condvar->i_waiting_threads++;
 491
 492         if( p_condvar->SignalObjectAndWait && p_mutex->mutex )
 493         {
 494             /* It is only possible to atomically release the mutex and
 495              * initiate the waiting on WinNT/2K/XP. Win9x doesn't have
 496              * SignalObjectAndWait(). */
 497             p_condvar->SignalObjectAndWait( p_mutex->mutex,
 498                                             p_condvar->event,
 499                                             INFINITE, FALSE );
 500         }
 501         else
 502         {
 503             LeaveCriticalSection( &p_mutex->csection );
 504             WaitForSingleObject( p_condvar->event, INFINITE );
 505         }
 506
 507         p_condvar->i_waiting_threads--;
 508     }
 509     else if( p_condvar->i_win9x_cv == 1 )
 510     {
 511         int i_waiting_threads;
 512
 513         /* Wait for the gate to be open */
 514         WaitForSingleObject( p_condvar->event, INFINITE );
 515
 516         /* Increase our wait count */
 517         p_condvar->i_waiting_threads++;
 518
 519         LeaveCriticalSection( &p_mutex->csection );
 520         WaitForSingleObject( p_condvar->semaphore, INFINITE );
 521
 522         /* Decrement and test must be atomic */
 523         EnterCriticalSection( &p_condvar->csection );
 524
 525         /* Decrease our wait count */
 526         i_waiting_threads = --p_condvar->i_waiting_threads;
 527
 528         LeaveCriticalSection( &p_condvar->csection );
 529
 530         /* Reopen the gate if we were the last waiting thread */
 531         if( !i_waiting_threads )
 532             SetEvent( p_condvar->event );
 533     }
 534     else
 535     {
 536         int i_waiting_threads;
 537
 538         /* Increase our wait count */
 539         p_condvar->i_waiting_threads++;
 540
 541         LeaveCriticalSection( &p_mutex->csection );
 542         WaitForSingleObject( p_condvar->semaphore, INFINITE );
 543
 544         /* Decrement and test must be atomic */
 545         EnterCriticalSection( &p_condvar->csection );
 546
 547         /* Decrease our wait count */
 548         i_waiting_threads = --p_condvar->i_waiting_threads;
 549
 550         LeaveCriticalSection( &p_condvar->csection );
 551
 552         /* Signal that the last waiting thread just went through */
 553         if( !i_waiting_threads )
 554             SetEvent( p_condvar->event );
 555     }
 556
 557     /* Reacquire the mutex before returning. */
 558     vlc_mutex_lock( p_mutex );
 559
 560     return 0;
 561
 562 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 563
 564 #   ifdef DEBUG
 565     /* In debug mode, timeout */
 566     struct timeval now;
 567     struct timespec timeout;
 568
 569     for( ; ; )
 570     {
 571         gettimeofday( &now, NULL );
 572         timeout.tv_sec = now.tv_sec + THREAD_COND_TIMEOUT;
 573         timeout.tv_nsec = now.tv_usec * 1000;
 574
 575         i_result = pthread_cond_timedwait( &p_condvar->cond, &p_mutex->mutex,
 576                                            &timeout );
 577
 578         if( i_result == ETIMEDOUT )
 579         {
 580             msg_Warn( p_condvar->p_this,
 581                       "thread %d: possible deadlock detected "
 582                       "in cond_wait at %s:%d (%s)", pthread_self(),
 583                       psz_file, i_line, strerror(i_result) );
 584         }
 585         else break;
 586     }
 587 #   else
 588     i_result = pthread_cond_wait( &p_condvar->cond, &p_mutex->mutex );
 589 #   endif
 590
 591     if ( i_result )
 592     {
 593         i_thread = (int)pthread_self();
 594         psz_error = strerror(i_result);
 595     }
 596
 597 #elif defined( HAVE_CTHREADS_H )
 598     condition_wait( (condition_t)p_condvar, (mutex_t)p_mutex );
 599     return 0;
 600
 601 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 602     if( p_condvar == NULL )
 603     {
 604         i_result = B_BAD_VALUE;
 605     }
 606     else if( p_mutex == NULL )
 607     {
 608         i_result = B_BAD_VALUE;
 609     }
 610     else if( p_condvar->init < 2000 )
 611     {
 612         i_result = B_NO_INIT;
 613     }
 614
 615     /* The p_condvar->thread var is initialized before the unlock because
 616      * it enables to identify when the thread is interrupted beetwen the
 617      * unlock line and the suspend_thread line */
 618     p_condvar->thread = find_thread( NULL );
 619     vlc_mutex_unlock( p_mutex );
 620     suspend_thread( p_condvar->thread );
 621     p_condvar->thread = -1;
 622
 623     vlc_mutex_lock( p_mutex );
 624     return 0;
 625
 626 #endif
 627
 628     if( i_result )
 629     {
 630         msg_Err( p_condvar->p_this,
 631                  "thread %d: cond_wait failed at %s:%d (%d:%s)",
 632                  i_thread, psz_file, i_line, i_result, psz_error );
 633     }
 634
 635     return i_result;
 636 }
 637
 638 /*****************************************************************************
 639  * vlc_cond_destroy: destroy a condition
 640  *****************************************************************************/
 641 #define vlc_cond_destroy( P_COND )                                          \
 642     __vlc_cond_destroy( __FILE__, __LINE__, P_COND )
 643
 644 /*****************************************************************************
 645  * vlc_thread_create: create a thread
 646  *****************************************************************************/
 647 #define vlc_thread_create( P_THIS, PSZ_NAME, FUNC, PRIORITY, WAIT )         \
 648     __vlc_thread_create( VLC_OBJECT(P_THIS), __FILE__, __LINE__, PSZ_NAME, (void * ( * ) ( void * ))FUNC, PRIORITY, WAIT )
 649
 650 /*****************************************************************************
 651  * vlc_thread_ready: tell the parent thread we were successfully spawned
 652  *****************************************************************************/
 653 #define vlc_thread_ready( P_THIS )                                          \
 654     __vlc_thread_ready( VLC_OBJECT(P_THIS) )
 655
 656 /*****************************************************************************
 657  * vlc_thread_join: wait until a thread exits
 658  *****************************************************************************/
 659 #define vlc_thread_join( P_THIS )                                           \
 660     __vlc_thread_join( VLC_OBJECT(P_THIS), __FILE__, __LINE__ )