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 1.8 2002/07/31 20:56:50 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     volatile int        i_waiting_threads;
 120     /* WinNT/2K/XP implementation */
 121     HANDLE              event;
 122     SIGNALOBJECTANDWAIT SignalObjectAndWait;
 123     /* Win95/98/ME implementation */
 124     HANDLE              semaphore;
 125     CRITICAL_SECTION    csection;
 126     int                 i_win9x_cv;
 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( 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( 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( 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( 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->semaphore )
 365     {
 366         PulseEvent( p_condvar->event );
 367     }
 368     else if( p_condvar->i_win9x_cv == 1 )
 369     {
 370         /* Wait for the gate to be open */
 371         WaitForSingleObject( p_condvar->event, INFINITE );
 372
 373         if( p_condvar->i_waiting_threads )
 374         {
 375             /* Using a semaphore exposes us to a race condition. It is
 376              * possible for another thread to start waiting on the semaphore
 377              * just after we signaled it and thus steal the signal.
 378              * We have to prevent new threads from entering the cond_wait(). */
 379             ResetEvent( p_condvar->event );
 380
 381             /* A semaphore is used here because Win9x doesn't have
 382              * SignalObjectAndWait() and thus a race condition exists
 383              * during the time we release the mutex and the time we start
 384              * waiting on the event (more precisely, the signal can sometimes
 385              * be missed by the waiting thread if we use PulseEvent()). */
 386             ReleaseSemaphore( p_condvar->semaphore, 1, 0 );
 387         }
 388     }
 389     else
 390     {
 391         if( p_condvar->i_waiting_threads )
 392         {
 393             ReleaseSemaphore( p_condvar->semaphore, 1, 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     return pthread_cond_signal( p_condvar );
 403
 404 #elif defined( HAVE_CTHREADS_H )
 405     /* condition_signal() */
 406     if ( p_condvar->queue.head || p_condvar->implications )
 407     {
 408         cond_signal( (condition_t)p_condvar );
 409     }
 410     return 0;
 411
 412 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 413     if( !p_condvar )
 414     {
 415         return B_BAD_VALUE;
 416     }
 417
 418     if( p_condvar->init < 2000 )
 419     {
 420         return B_NO_INIT;
 421     }
 422
 423     while( p_condvar->thread != -1 )
 424     {
 425         thread_info info;
 426         if( get_thread_info(p_condvar->thread, &info) == B_BAD_VALUE )
 427         {
 428             return 0;
 429         }
 430
 431         if( info.state != B_THREAD_SUSPENDED )
 432         {
 433             /* The  waiting thread is not suspended so it could
 434              * have been interrupted beetwen the unlock and the
 435              * suspend_thread line. That is why we sleep a little
 436              * before retesting p_condver->thread. */
 437             snooze( 10000 );
 438         }
 439         else
 440         {
 441             /* Ok, we have to wake up that thread */
 442             resume_thread( p_condvar->thread );
 443             return 0;
 444         }
 445     }
 446     return 0;
 447
 448 #endif
 449 }
 450
 451 /*****************************************************************************
 452  * vlc_cond_broadcast: start all threads waiting on condition completion
 453  *****************************************************************************/
 454 /*
 455  * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
 456  * Only works with pthreads, you need to adapt it for others
 457  * FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
 458  */
 459 static inline int vlc_cond_broadcast( vlc_cond_t *p_condvar )
 460 {
 461 #if defined( PTH_INIT_IN_PTH_H )
 462     return pth_cond_notify( p_condvar, FALSE );
 463
 464 #elif defined( ST_INIT_IN_ST_H )
 465     return st_cond_broadcast( p_condvar );
 466
 467 #elif defined( WIN32 )
 468     /* Release all waiting threads. */
 469     int i;
 470
 471     if( !p_condvar->semaphore )
 472         for( i = p_condvar->i_waiting_threads; i > 0; i-- )
 473             PulseEvent( p_condvar->event );
 474     else if( p_condvar->i_win9x_cv == 1 )
 475     {
 476         /* Wait for the gate to be open */
 477         WaitForSingleObject( p_condvar->event, INFINITE );
 478
 479         if( p_condvar->i_waiting_threads )
 480         {
 481             /* close gate */
 482             ResetEvent( p_condvar->event );
 483
 484             ReleaseSemaphore( p_condvar->semaphore,
 485                               p_condvar->i_waiting_threads, 0 );
 486         }
 487     }
 488     else
 489     {
 490         if( p_condvar->i_waiting_threads )
 491         {
 492             ReleaseSemaphore( p_condvar->semaphore,
 493                               p_condvar->i_waiting_threads, 0 );
 494             /* Wait for the last thread to be awakened */
 495             WaitForSingleObject( p_condvar->event, INFINITE );
 496         }
 497     }
 498
 499     return 0;
 500
 501 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 502     return pthread_cond_broadcast( p_condvar );
 503
 504 #elif defined( HAVE_CTHREADS_H )
 505     /* condition_signal() */
 506     if ( p_condvar->queue.head || p_condvar->implications )
 507     {
 508         cond_signal( (condition_t)p_condvar );
 509     }
 510     return 0;
 511
 512 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 513     if( !p_condvar )
 514     {
 515         return B_BAD_VALUE;
 516     }
 517
 518     if( p_condvar->init < 2000 )
 519     {
 520         return B_NO_INIT;
 521     }
 522
 523     while( p_condvar->thread != -1 )
 524     {
 525         thread_info info;
 526         if( get_thread_info(p_condvar->thread, &info) == B_BAD_VALUE )
 527         {
 528             return 0;
 529         }
 530
 531         if( info.state != B_THREAD_SUSPENDED )
 532         {
 533             /* The  waiting thread is not suspended so it could
 534              * have been interrupted beetwen the unlock and the
 535              * suspend_thread line. That is why we sleep a little
 536              * before retesting p_condver->thread. */
 537             snooze( 10000 );
 538         }
 539         else
 540         {
 541             /* Ok, we have to wake up that thread */
 542             resume_thread( p_condvar->thread );
 543             return 0;
 544         }
 545     }
 546     return 0;
 547
 548 #endif
 549 }
 550
 551 /*****************************************************************************
 552  * vlc_cond_wait: wait until condition completion
 553  *****************************************************************************/
 554 #ifdef DEBUG
 555 #   define vlc_cond_wait( P_COND, P_MUTEX )                                   \
 556         __vlc_cond_wait( __FILE__, __LINE__, P_COND, P_MUTEX  )
 557 #else
 558 #   define vlc_cond_wait( P_COND, P_MUTEX )                                   \
 559         __vlc_cond_wait( "(unknown)", 0, P_COND, P_MUTEX )
 560 #endif
 561
 562 static inline int __vlc_cond_wait( char * psz_file, int i_line,
 563                                    vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex )
 564 {
 565 #if defined( PTH_INIT_IN_PTH_H )
 566     return pth_cond_await( p_condvar, p_mutex, NULL );
 567
 568 #elif defined( ST_INIT_IN_ST_H )
 569     int i_ret;
 570
 571     st_mutex_unlock( *p_mutex );
 572     i_ret = st_cond_wait( *p_condvar );
 573     st_mutex_lock( *p_mutex );
 574
 575     return i_ret;
 576
 577 #elif defined( WIN32 )
 578     if( !p_condvar->semaphore )
 579     {
 580         /* Increase our wait count */
 581         p_condvar->i_waiting_threads++;
 582
 583         if( p_condvar->SignalObjectAndWait && p_mutex->mutex )
 584         /* It is only possible to atomically release the mutex and initiate the
 585          * waiting on WinNT/2K/XP. Win9x doesn't have SignalObjectAndWait(). */
 586             p_condvar->SignalObjectAndWait( p_mutex->mutex,
 587                                             p_condvar->event,
 588                                             INFINITE, FALSE );
 589         else
 590         {
 591             LeaveCriticalSection( &p_mutex->csection );
 592             WaitForSingleObject( p_condvar->event, INFINITE );
 593         }
 594
 595         p_condvar->i_waiting_threads--;
 596     }
 597     else if( p_condvar->i_win9x_cv == 1 )
 598     {
 599         int i_waiting_threads;
 600
 601         /* Wait for the gate to be open */
 602         WaitForSingleObject( p_condvar->event, INFINITE );
 603
 604         /* Increase our wait count */
 605         p_condvar->i_waiting_threads++;
 606
 607         LeaveCriticalSection( &p_mutex->csection );
 608         WaitForSingleObject( p_condvar->semaphore, INFINITE );
 609
 610         /* Decrement and test must be atomic */
 611         EnterCriticalSection( &p_condvar->csection );
 612
 613         /* Decrease our wait count */
 614         i_waiting_threads = --p_condvar->i_waiting_threads;
 615
 616         LeaveCriticalSection( &p_condvar->csection );
 617
 618         /* Reopen the gate if we were the last waiting thread */
 619         if( !i_waiting_threads )
 620             SetEvent( p_condvar->event );
 621     }
 622     else
 623     {
 624         int i_waiting_threads;
 625
 626         /* Increase our wait count */
 627         p_condvar->i_waiting_threads++;
 628
 629         LeaveCriticalSection( &p_mutex->csection );
 630         WaitForSingleObject( p_condvar->semaphore, INFINITE );
 631
 632         /* Decrement and test must be atomic */
 633         EnterCriticalSection( &p_condvar->csection );
 634
 635         /* Decrease our wait count */
 636         i_waiting_threads = --p_condvar->i_waiting_threads;
 637
 638         LeaveCriticalSection( &p_condvar->csection );
 639
 640         /* Signal that the last waiting thread just went through */
 641         if( !i_waiting_threads )
 642             SetEvent( p_condvar->event );
 643     }
 644
 645     /* Reacquire the mutex before returning. */
 646     vlc_mutex_lock( p_mutex );
 647
 648     return 0;
 649
 650 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 651
 652 #   ifdef DEBUG
 653     /* In debug mode, timeout */
 654     struct timeval now;
 655     struct timespec timeout;
 656     int    i_result;
 657
 658     for( ; ; )
 659     {
 660         gettimeofday( &now, NULL );
 661         timeout.tv_sec = now.tv_sec + THREAD_COND_TIMEOUT;
 662         timeout.tv_nsec = now.tv_usec * 1000;
 663
 664         i_result = pthread_cond_timedwait( p_condvar, p_mutex, &timeout );
 665
 666         if( i_result == ETIMEDOUT )
 667         {
 668 //X            msg_Warn( "thread %d: possible deadlock detected "
 669 //X                      "in cond_wait at %s:%d (%s)", pthread_self(),
 670 //X                      psz_file, i_line, strerror(i_result) );
 671             continue;
 672         }
 673
 674         if( i_result )
 675         {
 676 //X            msg_Err( "thread %d: cond_wait failed at %s:%d (%s)",
 677 //X                     pthread_self(), psz_file, i_line, strerror(i_result) );
 678         }
 679         return( i_result );
 680     }
 681 #   else
 682     return pthread_cond_wait( p_condvar, p_mutex );
 683 #   endif
 684
 685 #elif defined( HAVE_CTHREADS_H )
 686     condition_wait( (condition_t)p_condvar, (mutex_t)p_mutex );
 687     return 0;
 688
 689 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 690     if( !p_condvar )
 691     {
 692         return B_BAD_VALUE;
 693     }
 694
 695     if( !p_mutex )
 696     {
 697         return B_BAD_VALUE;
 698     }
 699
 700     if( p_condvar->init < 2000 )
 701     {
 702         return B_NO_INIT;
 703     }
 704
 705     /* The p_condvar->thread var is initialized before the unlock because
 706      * it enables to identify when the thread is interrupted beetwen the
 707      * unlock line and the suspend_thread line */
 708     p_condvar->thread = find_thread( NULL );
 709     vlc_mutex_unlock( p_mutex );
 710     suspend_thread( p_condvar->thread );
 711     p_condvar->thread = -1;
 712
 713     vlc_mutex_lock( p_mutex );
 714     return 0;
 715
 716 #endif
 717 }
 718
 719 /*****************************************************************************
 720  * vlc_cond_destroy: destroy a condition
 721  *****************************************************************************/
 722 #ifdef DEBUG
 723 #   define vlc_cond_destroy( P_COND )                                       \
 724         __vlc_cond_destroy( __FILE__, __LINE__, P_COND )
 725 #else
 726 #   define vlc_cond_destroy( P_COND )                                       \
 727         __vlc_cond_destroy( "(unknown)", 0, P_COND )
 728 #endif
 729
 730 /*****************************************************************************
 731  * vlc_thread_create: create a thread
 732  *****************************************************************************/
 733 #   define vlc_thread_create( P_THIS, PSZ_NAME, FUNC, WAIT )                \
 734         __vlc_thread_create( VLC_OBJECT(P_THIS), __FILE__, __LINE__, PSZ_NAME, (void * ( * ) ( void * ))FUNC, WAIT )
 735
 736 /*****************************************************************************
 737  * vlc_thread_ready: tell the parent thread we were successfully spawned
 738  *****************************************************************************/
 739 #   define vlc_thread_ready( P_THIS )                                       \
 740         __vlc_thread_ready( VLC_OBJECT(P_THIS) )
 741
 742 /*****************************************************************************
 743  * vlc_thread_join: wait until a thread exits
 744  *****************************************************************************/
 745 #ifdef DEBUG
 746 #   define vlc_thread_join( P_THIS )                                        \
 747         __vlc_thread_join( VLC_OBJECT(P_THIS), __FILE__, __LINE__ )
 748 #else
 749 #   define vlc_thread_join( P_THIS )                                        \
 750         __vlc_thread_join( VLC_OBJECT(P_THIS), "(unknown)", 0 )
 751 #endif