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

   1 /*****************************************************************************
   2  * threads.h : threads implementation for the VideoLAN client
   3  * This header provides a portable threads implementation.
   4  *****************************************************************************
   5  * Copyright (C) 1999, 2000 VideoLAN
   6  * $Id: vlc_threads.h,v 1.5 2002/07/16 21:29:10 sam 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  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  25  *****************************************************************************/
  26
  27 #include <stdio.h>
  28
  29 #if defined(GPROF) || defined(DEBUG)
  30 #   include <sys/time.h>
  31 #endif
  32
  33 #if defined( PTH_INIT_IN_PTH_H )                                  /* GNU Pth */
  34 #   include <pth.h>
  35
  36 #elif defined( ST_INIT_IN_ST_H )                            /* State threads */
  37 #   include <st.h>
  38
  39 #elif defined( WIN32 )                                          /* Win32 API */
  40 #   include <process.h>
  41
  42 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )  /* pthreads (like Linux & BSD) */
  43 #   include <pthread.h>
  44 #   ifdef DEBUG
  45         /* Needed for pthread_cond_timedwait */
  46 #       include <errno.h>
  47 #   endif
  48     /* This is not prototyped under Linux, though it exists. */
  49     int pthread_mutexattr_setkind_np( pthread_mutexattr_t *attr, int kind );
  50
  51 #elif defined( HAVE_CTHREADS_H )                                  /* GNUMach */
  52 #   include <cthreads.h>
  53
  54 #elif defined( HAVE_KERNEL_SCHEDULER_H )                             /* BeOS */
  55 #   include <kernel/OS.h>
  56 #   include <kernel/scheduler.h>
  57 #   include <byteorder.h>
  58
  59 #else
  60 #   error no threads available on your system !
  61
  62 #endif
  63
  64 /*****************************************************************************
  65  * Constants
  66  *****************************************************************************
  67  * These constants are used by all threads in *_CreateThread() and
  68  * *_DestroyThreads() functions. Since those calls are non-blocking, an integer
  69  * value is used as a shared flag to represent the status of the thread.
  70  *****************************************************************************/
  71
  72 /* Void status - this value can be used to make sure no operation is currently
  73  * in progress on the concerned thread in an array of recorded threads */
  74 #define THREAD_NOP          0                            /* nothing happened */
  75
  76 /* Creation status */
  77 #define THREAD_CREATE       10                     /* thread is initializing */
  78 #define THREAD_START        11                          /* thread has forked */
  79 #define THREAD_READY        19                            /* thread is ready */
  80
  81 /* Destructions status */
  82 #define THREAD_DESTROY      20            /* destruction order has been sent */
  83 #define THREAD_END          21        /* destruction order has been received */
  84 #define THREAD_OVER         29             /* thread does not exist any more */
  85
  86 /* Error status */
  87 #define THREAD_ERROR        30                           /* an error occured */
  88 #define THREAD_FATAL        31  /* an fatal error occured - program must end */
  89
  90 /*****************************************************************************
  91  * Type definitions
  92  *****************************************************************************/
  93
  94 #if defined( PTH_INIT_IN_PTH_H )
  95 typedef pth_t            vlc_thread_t;
  96 typedef pth_mutex_t      vlc_mutex_t;
  97 typedef pth_cond_t       vlc_cond_t;
  98
  99 #elif defined( ST_INIT_IN_ST_H )
 100 typedef st_thread_t *    vlc_thread_t;
 101 typedef st_mutex_t *     vlc_mutex_t;
 102 typedef st_cond_t *      vlc_cond_t;
 103
 104 #elif defined( WIN32 )
 105 typedef HANDLE vlc_thread_t;
 106 typedef BOOL (WINAPI *SIGNALOBJECTANDWAIT) ( HANDLE, HANDLE, DWORD, BOOL );
 107 typedef unsigned (__stdcall *PTHREAD_START) (void *);
 108
 109 typedef struct
 110 {
 111     /* WinNT/2K/XP implementation */
 112     HANDLE              mutex;
 113     /* Win95/98/ME implementation */
 114     CRITICAL_SECTION    csection;
 115 } vlc_mutex_t;
 116
 117 typedef struct
 118 {
 119     int                 i_waiting_threads;
 120     /* WinNT/2K/XP implementation */
 121     HANDLE              semaphore;
 122     HANDLE              signal;
 123     vlc_bool_t          b_broadcast;
 124     SIGNALOBJECTANDWAIT SignalObjectAndWait;
 125     /* Win95/98/ME implementation */
 126     HANDLE              p_events[2];
 127 } vlc_cond_t;
 128
 129 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 130 typedef pthread_t        vlc_thread_t;
 131 typedef pthread_mutex_t  vlc_mutex_t;
 132 typedef pthread_cond_t   vlc_cond_t;
 133
 134 #elif defined( HAVE_CTHREADS_H )
 135 typedef cthread_t        vlc_thread_t;
 136
 137 /* Those structs are the ones defined in /include/cthreads.h but we need
 138  * to handle (&foo) where foo is a (mutex_t) while they handle (foo) where
 139  * foo is a (mutex_t*) */
 140 typedef struct
 141 {
 142     spin_lock_t held;
 143     spin_lock_t lock;
 144     char *name;
 145     struct cthread_queue queue;
 146 } vlc_mutex_t;
 147
 148 typedef struct
 149 {
 150     spin_lock_t lock;
 151     struct cthread_queue queue;
 152     char *name;
 153     struct cond_imp *implications;
 154 } vlc_cond_t;
 155
 156 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 157 /* This is the BeOS implementation of the vlc threads, note that the mutex is
 158  * not a real mutex and the cond_var is not like a pthread cond_var but it is
 159  * enough for what wee need */
 160
 161 typedef thread_id vlc_thread_t;
 162
 163 typedef struct
 164 {
 165     int32           init;
 166     sem_id          lock;
 167 } vlc_mutex_t;
 168
 169 typedef struct
 170 {
 171     int32           init;
 172     thread_id       thread;
 173 } vlc_cond_t;
 174
 175 #endif
 176
 177 /*****************************************************************************
 178  * Function definitions
 179  *****************************************************************************/
 180 VLC_EXPORT( int,  __vlc_threads_init,  ( vlc_object_t * ) );
 181 VLC_EXPORT( int,  __vlc_threads_end,   ( vlc_object_t * ) );
 182 VLC_EXPORT( int,  __vlc_mutex_init,    ( vlc_object_t *, vlc_mutex_t * ) );
 183 VLC_EXPORT( int,  __vlc_mutex_destroy, ( char *, int, vlc_mutex_t * ) );
 184 VLC_EXPORT( int,  __vlc_cond_init,     ( vlc_object_t *, vlc_cond_t * ) );
 185 VLC_EXPORT( int,  __vlc_cond_destroy,  ( char *, int, vlc_cond_t * ) );
 186 VLC_EXPORT( int,  __vlc_thread_create, ( vlc_object_t *, char *, int, char *, void * ( * ) ( void * ), vlc_bool_t ) );
 187 VLC_EXPORT( void, __vlc_thread_ready,  ( vlc_object_t * ) );
 188 VLC_EXPORT( void, __vlc_thread_join,   ( vlc_object_t *, char *, int ) );
 189
 190 /*****************************************************************************
 191  * vlc_threads_init: initialize threads system
 192  *****************************************************************************/
 193 #define vlc_threads_init( P_THIS )                                          \
 194     __vlc_threads_init( CAST_TO_VLC_OBJECT(P_THIS) )
 195
 196 /*****************************************************************************
 197  * vlc_threads_end: deinitialize threads system
 198  *****************************************************************************/
 199 #define vlc_threads_end( P_THIS )                                          \
 200     __vlc_threads_end( CAST_TO_VLC_OBJECT(P_THIS) )
 201
 202 /*****************************************************************************
 203  * vlc_mutex_init: initialize a mutex
 204  *****************************************************************************/
 205 #define vlc_mutex_init( P_THIS, P_MUTEX )                                   \
 206     __vlc_mutex_init( CAST_TO_VLC_OBJECT(P_THIS), P_MUTEX )
 207
 208 /*****************************************************************************
 209  * vlc_mutex_lock: lock a mutex
 210  *****************************************************************************/
 211 #ifdef DEBUG
 212 #   define vlc_mutex_lock( P_MUTEX )                                        \
 213         __vlc_mutex_lock( __FILE__, __LINE__, P_MUTEX )
 214 #else
 215 #   define vlc_mutex_lock( P_MUTEX )                                        \
 216         __vlc_mutex_lock( "(unknown)", 0, P_MUTEX )
 217 #endif
 218
 219 static inline int __vlc_mutex_lock( char * psz_file, int i_line,
 220                                     vlc_mutex_t *p_mutex )
 221 {
 222 #if defined( PTH_INIT_IN_PTH_H )
 223     return pth_mutex_acquire( p_mutex, TRUE, NULL );
 224
 225 #elif defined( ST_INIT_IN_ST_H )
 226     return st_mutex_lock( *p_mutex );
 227
 228 #elif defined( WIN32 )
 229     if( p_mutex->mutex )
 230     {
 231         WaitForSingleObject( p_mutex->mutex, INFINITE );
 232     }
 233     else
 234     {
 235         EnterCriticalSection( &p_mutex->csection );
 236     }
 237     return 0;
 238
 239 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 240     int i_return = pthread_mutex_lock( p_mutex );
 241     if( i_return )
 242     {
 243 //        msg_Err( "thread %d: mutex_lock failed at %s:%d (%s)",
 244 //                 pthread_self(), psz_file, i_line, strerror(i_return) );
 245     }
 246     return i_return;
 247
 248 #elif defined( HAVE_CTHREADS_H )
 249     mutex_lock( p_mutex );
 250     return 0;
 251
 252 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 253     status_t err;
 254
 255     if( !p_mutex )
 256     {
 257         return B_BAD_VALUE;
 258     }
 259
 260     if( p_mutex->init < 2000 )
 261     {
 262         return B_NO_INIT;
 263     }
 264
 265     err = acquire_sem( p_mutex->lock );
 266     return err;
 267
 268 #endif
 269 }
 270
 271 /*****************************************************************************
 272  * vlc_mutex_unlock: unlock a mutex
 273  *****************************************************************************/
 274 #ifdef DEBUG
 275 #   define vlc_mutex_unlock( P_MUTEX )                                      \
 276         __vlc_mutex_unlock( __FILE__, __LINE__, P_MUTEX )
 277 #else
 278 #   define vlc_mutex_unlock( P_MUTEX )                                      \
 279         __vlc_mutex_unlock( "(unknown)", 0, P_MUTEX )
 280 #endif
 281
 282 static inline int __vlc_mutex_unlock( char * psz_file, int i_line,
 283                                       vlc_mutex_t *p_mutex )
 284 {
 285 #if defined( PTH_INIT_IN_PTH_H )
 286     return pth_mutex_release( p_mutex );
 287
 288 #elif defined( ST_INIT_IN_ST_H )
 289     return st_mutex_unlock( *p_mutex );
 290
 291 #elif defined( WIN32 )
 292     if( p_mutex->mutex )
 293     {
 294         ReleaseMutex( p_mutex->mutex );
 295     }
 296     else
 297     {
 298         LeaveCriticalSection( &p_mutex->csection );
 299     }
 300     return 0;
 301
 302 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 303     int i_return = pthread_mutex_unlock( p_mutex );
 304     if( i_return )
 305     {
 306 //        msg_Err( "thread %d: mutex_unlock failed at %s:%d (%s)",
 307 //                 pthread_self(), psz_file, i_line, strerror(i_return) );
 308     }
 309     return i_return;
 310
 311 #elif defined( HAVE_CTHREADS_H )
 312     mutex_unlock( p_mutex );
 313     return 0;
 314
 315 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 316     if( !p_mutex)
 317     {
 318         return B_BAD_VALUE;
 319     }
 320
 321     if( p_mutex->init < 2000 )
 322     {
 323         return B_NO_INIT;
 324     }
 325
 326     release_sem( p_mutex->lock );
 327     return B_OK;
 328
 329 #endif
 330 }
 331
 332 /*****************************************************************************
 333  * vlc_mutex_destroy: destroy a mutex
 334  *****************************************************************************/
 335 #ifdef DEBUG
 336 #   define vlc_mutex_destroy( P_MUTEX )                                     \
 337         __vlc_mutex_destroy( __FILE__, __LINE__, P_MUTEX )
 338 #else
 339 #   define vlc_mutex_destroy( P_MUTEX )                                     \
 340         __vlc_mutex_destroy( "(unknown)", 0, P_MUTEX )
 341 #endif
 342
 343 /*****************************************************************************
 344  * vlc_cond_init: initialize a condition
 345  *****************************************************************************/
 346 #define vlc_cond_init( P_THIS, P_COND )                                   \
 347     __vlc_cond_init( CAST_TO_VLC_OBJECT(P_THIS), P_COND )
 348
 349 /*****************************************************************************
 350  * vlc_cond_signal: start a thread on condition completion
 351  *****************************************************************************/
 352 static inline int vlc_cond_signal( vlc_cond_t *p_condvar )
 353 {
 354 #if defined( PTH_INIT_IN_PTH_H )
 355     return pth_cond_notify( p_condvar, FALSE );
 356
 357 #elif defined( ST_INIT_IN_ST_H )
 358     return st_cond_signal( *p_condvar );
 359
 360 #elif defined( WIN32 )
 361     /* Release one waiting thread if one is available. */
 362     /* For this trick to work properly, the vlc_cond_signal must be surrounded
 363      * by a mutex. This will prevent another thread from stealing the signal */
 364     if( p_condvar->i_waiting_threads )
 365     {
 366         if( p_condvar->signal )
 367         {
 368             ReleaseSemaphore( p_condvar->semaphore, 1, 0 );
 369         }
 370         else
 371         {
 372             SetEvent( p_condvar->p_events[0/*signal*/] );
 373         }
 374     }
 375     return 0;
 376
 377 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 378     return pthread_cond_signal( p_condvar );
 379
 380 #elif defined( HAVE_CTHREADS_H )
 381     /* condition_signal() */
 382     if ( p_condvar->queue.head || p_condvar->implications )
 383     {
 384         cond_signal( (condition_t)p_condvar );
 385     }
 386     return 0;
 387
 388 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 389     if( !p_condvar )
 390     {
 391         return B_BAD_VALUE;
 392     }
 393
 394     if( p_condvar->init < 2000 )
 395     {
 396         return B_NO_INIT;
 397     }
 398
 399     while( p_condvar->thread != -1 )
 400     {
 401         thread_info info;
 402         if( get_thread_info(p_condvar->thread, &info) == B_BAD_VALUE )
 403         {
 404             return 0;
 405         }
 406
 407         if( info.state != B_THREAD_SUSPENDED )
 408         {
 409             /* The  waiting thread is not suspended so it could
 410              * have been interrupted beetwen the unlock and the
 411              * suspend_thread line. That is why we sleep a little
 412              * before retesting p_condver->thread. */
 413             snooze( 10000 );
 414         }
 415         else
 416         {
 417             /* Ok, we have to wake up that thread */
 418             resume_thread( p_condvar->thread );
 419             return 0;
 420         }
 421     }
 422     return 0;
 423
 424 #endif
 425 }
 426
 427 /*****************************************************************************
 428  * vlc_cond_broadcast: start all threads waiting on condition completion
 429  *****************************************************************************/
 430 /*
 431  * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
 432  * Only works with pthreads, you need to adapt it for others
 433  * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
 434  */
 435 static inline int vlc_cond_broadcast( vlc_cond_t *p_condvar )
 436 {
 437 #if defined( PTH_INIT_IN_PTH_H )
 438     return pth_cond_notify( p_condvar, FALSE );
 439
 440 #elif defined( ST_INIT_IN_ST_H )
 441     return st_cond_broadcast( p_condvar );
 442
 443 #elif defined( WIN32 )
 444     /* Release all waiting threads. */
 445     if( p_condvar->i_waiting_threads )
 446     {
 447         if( p_condvar->signal )
 448         {
 449             p_condvar->b_broadcast = 1;
 450             /* This call is atomic */
 451             ReleaseSemaphore( p_condvar->semaphore,
 452                               p_condvar->i_waiting_threads, 0 );
 453             /* Wait for all threads to get the semaphore */
 454             WaitForSingleObject( p_condvar->signal, INFINITE );
 455             p_condvar->b_broadcast = 0;
 456         }
 457         else
 458         {
 459             SetEvent( p_condvar->p_events[1/*broadcast*/] );
 460         }
 461     }
 462     return 0;
 463
 464 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 465     return pthread_cond_broadcast( p_condvar );
 466
 467 #elif defined( HAVE_CTHREADS_H )
 468     /* condition_signal() */
 469     if ( p_condvar->queue.head || p_condvar->implications )
 470     {
 471         cond_signal( (condition_t)p_condvar );
 472     }
 473     return 0;
 474
 475 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 476     if( !p_condvar )
 477     {
 478         return B_BAD_VALUE;
 479     }
 480
 481     if( p_condvar->init < 2000 )
 482     {
 483         return B_NO_INIT;
 484     }
 485
 486     while( p_condvar->thread != -1 )
 487     {
 488         thread_info info;
 489         if( get_thread_info(p_condvar->thread, &info) == B_BAD_VALUE )
 490         {
 491             return 0;
 492         }
 493
 494         if( info.state != B_THREAD_SUSPENDED )
 495         {
 496             /* The  waiting thread is not suspended so it could
 497              * have been interrupted beetwen the unlock and the
 498              * suspend_thread line. That is why we sleep a little
 499              * before retesting p_condver->thread. */
 500             snooze( 10000 );
 501         }
 502         else
 503         {
 504             /* Ok, we have to wake up that thread */
 505             resume_thread( p_condvar->thread );
 506             return 0;
 507         }
 508     }
 509     return 0;
 510
 511 #endif
 512 }
 513
 514 /*****************************************************************************
 515  * vlc_cond_wait: wait until condition completion
 516  *****************************************************************************/
 517 #ifdef DEBUG
 518 #   define vlc_cond_wait( P_COND, P_MUTEX )                                   \
 519         __vlc_cond_wait( __FILE__, __LINE__, P_COND, P_MUTEX  )
 520 #else
 521 #   define vlc_cond_wait( P_COND, P_MUTEX )                                   \
 522         __vlc_cond_wait( "(unknown)", 0, P_COND, P_MUTEX )
 523 #endif
 524
 525 static inline int __vlc_cond_wait( char * psz_file, int i_line,
 526                                    vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex )
 527 {
 528 #if defined( PTH_INIT_IN_PTH_H )
 529     return pth_cond_await( p_condvar, p_mutex, NULL );
 530
 531 #elif defined( ST_INIT_IN_ST_H )
 532     int i_ret;
 533
 534     st_mutex_unlock( *p_mutex );
 535     i_ret = st_cond_wait( *p_condvar );
 536     st_mutex_lock( *p_mutex );
 537
 538     return i_ret;
 539
 540 #elif defined( WIN32 )
 541     /* Increase our wait count */
 542     p_condvar->i_waiting_threads++;
 543
 544     if( p_condvar->signal )
 545     {
 546         /* It is only possible to atomically release the mutex and initiate the
 547          * waiting on WinNT/2K/XP. Win9x doesn't have SignalObjectAndWait(). */
 548         p_condvar->SignalObjectAndWait( p_mutex->mutex, p_condvar->semaphore,
 549                                         INFINITE, FALSE );
 550         /* XXX: we should protect i_waiting_threads with a mutex, but
 551          * is it really worth it ? */
 552         p_condvar->i_waiting_threads--;
 553
 554         if( p_condvar->b_broadcast
 555              && p_condvar->i_waiting_threads == 0 )
 556         {
 557             p_condvar->SignalObjectAndWait( p_condvar->signal, p_mutex->mutex,
 558                                             INFINITE, FALSE );
 559         }
 560         else
 561         {
 562             /* Just take back the lock */
 563             WaitForSingleObject( p_mutex->mutex, INFINITE );
 564         }
 565         return 0;
 566     }
 567     else
 568     {
 569         int i_ret;
 570
 571         /* Release the mutex, wait, and reacquire. */
 572         LeaveCriticalSection( &p_mutex->csection );
 573         i_ret = WaitForMultipleObjects( 2, p_condvar->p_events,
 574                                         FALSE, INFINITE );
 575         EnterCriticalSection( &p_mutex->csection );
 576
 577         /* Decrease our wait count */
 578         p_condvar->i_waiting_threads--;
 579
 580         /* If we are the last waiter and it was a broadcast signal, reset
 581          * the broadcast event. */
 582         if( i_ret == WAIT_OBJECT_0 + 1/*broadcast*/
 583              && p_condvar->i_waiting_threads == 0 )
 584         {
 585             ResetEvent( p_condvar->p_events[1/*broadcast*/] );
 586         }
 587
 588         return( i_ret == WAIT_FAILED );
 589     }
 590
 591 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 592
 593 #   ifdef DEBUG
 594     /* In debug mode, timeout */
 595     struct timeval now;
 596     struct timespec timeout;
 597     int    i_result;
 598
 599     for( ; ; )
 600     {
 601         gettimeofday( &now, NULL );
 602         timeout.tv_sec = now.tv_sec + THREAD_COND_TIMEOUT;
 603         timeout.tv_nsec = now.tv_usec * 1000;
 604
 605         i_result = pthread_cond_timedwait( p_condvar, p_mutex, &timeout );
 606
 607         if( i_result == ETIMEDOUT )
 608         {
 609 //X            msg_Warn( "thread %d: possible deadlock detected "
 610 //X                      "in cond_wait at %s:%d (%s)", pthread_self(),
 611 //X                      psz_file, i_line, strerror(i_result) );
 612             continue;
 613         }
 614
 615         if( i_result )
 616         {
 617 //X            msg_Err( "thread %d: cond_wait failed at %s:%d (%s)",
 618 //X                     pthread_self(), psz_file, i_line, strerror(i_result) );
 619         }
 620         return( i_result );
 621     }
 622 #   else
 623     return pthread_cond_wait( p_condvar, p_mutex );
 624 #   endif
 625
 626 #elif defined( HAVE_CTHREADS_H )
 627     condition_wait( (condition_t)p_condvar, (mutex_t)p_mutex );
 628     return 0;
 629
 630 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 631     if( !p_condvar )
 632     {
 633         return B_BAD_VALUE;
 634     }
 635
 636     if( !p_mutex )
 637     {
 638         return B_BAD_VALUE;
 639     }
 640
 641     if( p_condvar->init < 2000 )
 642     {
 643         return B_NO_INIT;
 644     }
 645
 646     /* The p_condvar->thread var is initialized before the unlock because
 647      * it enables to identify when the thread is interrupted beetwen the
 648      * unlock line and the suspend_thread line */
 649     p_condvar->thread = find_thread( NULL );
 650     vlc_mutex_unlock( p_mutex );
 651     suspend_thread( p_condvar->thread );
 652     p_condvar->thread = -1;
 653
 654     vlc_mutex_lock( p_mutex );
 655     return 0;
 656
 657 #endif
 658 }
 659
 660 /*****************************************************************************
 661  * vlc_cond_destroy: destroy a condition
 662  *****************************************************************************/
 663 #ifdef DEBUG
 664 #   define vlc_cond_destroy( P_COND )                                       \
 665         __vlc_cond_destroy( __FILE__, __LINE__, P_COND )
 666 #else
 667 #   define vlc_cond_destroy( P_COND )                                       \
 668         __vlc_cond_destroy( "(unknown)", 0, P_COND )
 669 #endif
 670
 671 /*****************************************************************************
 672  * vlc_thread_create: create a thread
 673  *****************************************************************************/
 674 #   define vlc_thread_create( P_THIS, PSZ_NAME, FUNC, WAIT )                \
 675         __vlc_thread_create( CAST_TO_VLC_OBJECT(P_THIS), __FILE__, __LINE__, PSZ_NAME, (void * ( * ) ( void * ))FUNC, WAIT )
 676
 677 /*****************************************************************************
 678  * vlc_thread_ready: tell the parent thread we were successfully spawned
 679  *****************************************************************************/
 680 #   define vlc_thread_ready( P_THIS )                                       \
 681         __vlc_thread_ready( CAST_TO_VLC_OBJECT(P_THIS) )
 682
 683 /*****************************************************************************
 684  * vlc_thread_join: wait until a thread exits
 685  *****************************************************************************/
 686 #ifdef DEBUG
 687 #   define vlc_thread_join( P_THIS )                                        \
 688         __vlc_thread_join( CAST_TO_VLC_OBJECT(P_THIS), __FILE__, __LINE__ )
 689 #else
 690 #   define vlc_thread_join( P_THIS )                                        \
 691         __vlc_thread_join( CAST_TO_VLC_OBJECT(P_THIS), "(unknown)", 0 )
 692 #endif