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 1.42 2003/10/25 00:49:14 sam 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 #include <stdlib.h>
  29
  30 #define VLC_THREADS_UNINITIALIZED  0
  31 #define VLC_THREADS_PENDING        1
  32 #define VLC_THREADS_ERROR          2
  33 #define VLC_THREADS_READY          3
  34
  35 /*****************************************************************************
  36  * Global mutex for lazy initialization of the threads system
  37  *****************************************************************************/
  38 static volatile int i_initializations = 0;
  39
  40 #if defined( PTH_INIT_IN_PTH_H )
  41 #elif defined( ST_INIT_IN_ST_H )
  42 #elif defined( UNDER_CE )
  43 #elif defined( WIN32 )
  44 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
  45     static pthread_mutex_t once_mutex = PTHREAD_MUTEX_INITIALIZER;
  46 #elif defined( HAVE_CTHREADS_H )
  47 #elif defined( HAVE_KERNEL_SCHEDULER_H )
  48 #endif
  49
  50 /*****************************************************************************
  51  * Global variable for named mutexes
  52  *****************************************************************************/
  53 typedef struct vlc_namedmutex_t vlc_namedmutex_t;
  54 struct vlc_namedmutex_t
  55 {
  56     vlc_mutex_t lock;
  57
  58     char *psz_name;
  59     int i_usage;
  60     vlc_namedmutex_t *p_next;
  61 };
  62
  63 /*****************************************************************************
  64  * vlc_threads_init: initialize threads system
  65  *****************************************************************************
  66  * This function requires lazy initialization of a global lock in order to
  67  * keep the library really thread-safe. Some architectures don't support this
  68  * and thus do not guarantee the complete reentrancy.
  69  *****************************************************************************/
  70 int __vlc_threads_init( vlc_object_t *p_this )
  71 {
  72     static volatile int i_status = VLC_THREADS_UNINITIALIZED;
  73
  74     libvlc_t *p_libvlc = (libvlc_t *)p_this;
  75     int i_ret = VLC_SUCCESS;
  76
  77     /* If we have lazy mutex initialization, use it. Otherwise, we just
  78      * hope nothing wrong happens. */
  79 #if defined( PTH_INIT_IN_PTH_H )
  80 #elif defined( ST_INIT_IN_ST_H )
  81 #elif defined( UNDER_CE )
  82 #elif defined( WIN32 )
  83     HINSTANCE hInstLib;
  84 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
  85     pthread_mutex_lock( &once_mutex );
  86 #elif defined( HAVE_CTHREADS_H )
  87 #elif defined( HAVE_KERNEL_SCHEDULER_H )
  88 #endif
  89
  90     if( i_status == VLC_THREADS_UNINITIALIZED )
  91     {
  92         i_status = VLC_THREADS_PENDING;
  93
  94         /* We should be safe now. Do all the initialization stuff we want. */
  95         p_libvlc->b_ready = VLC_FALSE;
  96
  97 #if defined( PTH_INIT_IN_PTH_H )
  98         i_ret = ( pth_init() == FALSE );
  99
 100 #elif defined( ST_INIT_IN_ST_H )
 101         i_ret = st_init();
 102
 103 #elif defined( UNDER_CE )
 104         /* Nothing to initialize */
 105
 106 #elif defined( WIN32 )
 107         /* Dynamically get the address of SignalObjectAndWait */
 108         if( GetVersion() < 0x80000000 )
 109         {
 110             /* We are running on NT/2K/XP, we can use SignalObjectAndWait */
 111             hInstLib = LoadLibrary( "kernel32" );
 112             if( hInstLib )
 113             {
 114                 p_libvlc->SignalObjectAndWait =
 115                     (SIGNALOBJECTANDWAIT)GetProcAddress( hInstLib,
 116                                                      "SignalObjectAndWait" );
 117             }
 118         }
 119         else
 120         {
 121             p_libvlc->SignalObjectAndWait = NULL;
 122         }
 123
 124         p_libvlc->b_fast_mutex = 0;
 125         p_libvlc->i_win9x_cv = 0;
 126
 127 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 128 #elif defined( HAVE_CTHREADS_H )
 129 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 130 #endif
 131
 132         vlc_object_create( p_libvlc, VLC_OBJECT_ROOT );
 133
 134         if( i_ret )
 135         {
 136             i_status = VLC_THREADS_ERROR;
 137         }
 138         else
 139         {
 140             i_initializations++;
 141             i_status = VLC_THREADS_READY;
 142         }
 143     }
 144     else
 145     {
 146         /* Just increment the initialization count */
 147         i_initializations++;
 148     }
 149
 150     /* If we have lazy mutex initialization support, unlock the mutex;
 151      * otherwize, do a naive wait loop. */
 152 #if defined( PTH_INIT_IN_PTH_H )
 153     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 154 #elif defined( ST_INIT_IN_ST_H )
 155     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 156 #elif defined( UNDER_CE )
 157     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 158 #elif defined( WIN32 )
 159     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 160 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 161     pthread_mutex_unlock( &once_mutex );
 162 #elif defined( HAVE_CTHREADS_H )
 163     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 164 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 165     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 166 #endif
 167
 168     if( i_status != VLC_THREADS_READY )
 169     {
 170         return VLC_ETHREAD;
 171     }
 172
 173     return i_ret;
 174 }
 175
 176 /*****************************************************************************
 177  * vlc_threads_end: stop threads system
 178  *****************************************************************************
 179  * FIXME: This function is far from being threadsafe. We should undo exactly
 180  * what we did above in vlc_threads_init.
 181  *****************************************************************************/
 182 int __vlc_threads_end( vlc_object_t *p_this )
 183 {
 184 #if defined( PTH_INIT_IN_PTH_H )
 185     i_initializations--;
 186     if( i_initializations == 0 )
 187     {
 188         return ( pth_kill() == FALSE );
 189     }
 190
 191 #elif defined( ST_INIT_IN_ST_H )
 192     i_initializations--;
 193
 194 #elif defined( UNDER_CE )
 195     i_initializations--;
 196
 197 #elif defined( WIN32 )
 198     i_initializations--;
 199
 200 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 201     pthread_mutex_lock( &once_mutex );
 202     i_initializations--;
 203     pthread_mutex_unlock( &once_mutex );
 204
 205 #elif defined( HAVE_CTHREADS_H )
 206     i_initializations--;
 207
 208 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 209     i_initializations--;
 210
 211 #endif
 212     return VLC_SUCCESS;
 213 }
 214
 215 /*****************************************************************************
 216  * vlc_mutex_init: initialize a mutex
 217  *****************************************************************************/
 218 int __vlc_mutex_init( vlc_object_t *p_this, vlc_mutex_t *p_mutex )
 219 {
 220     p_mutex->p_this = p_this;
 221
 222 #if defined( PTH_INIT_IN_PTH_H )
 223     return ( pth_mutex_init( &p_mutex->mutex ) == FALSE );
 224
 225 #elif defined( ST_INIT_IN_ST_H )
 226     p_mutex->mutex = st_mutex_new();
 227     return ( p_mutex->mutex == NULL ) ? errno : 0;
 228
 229 #elif defined( UNDER_CE )
 230     InitializeCriticalSection( &p_mutex->csection );
 231     return 0;
 232
 233 #elif defined( WIN32 )
 234     /* We use mutexes on WinNT/2K/XP because we can use the SignalObjectAndWait
 235      * function and have a 100% correct vlc_cond_wait() implementation.
 236      * As this function is not available on Win9x, we can use the faster
 237      * CriticalSections */
 238     if( p_this->p_libvlc->SignalObjectAndWait &&
 239         !p_this->p_libvlc->b_fast_mutex )
 240     {
 241         /* We are running on NT/2K/XP, we can use SignalObjectAndWait */
 242         p_mutex->mutex = CreateMutex( 0, FALSE, 0 );
 243         return ( p_mutex->mutex != NULL ? 0 : 1 );
 244     }
 245     else
 246     {
 247         p_mutex->mutex = NULL;
 248         InitializeCriticalSection( &p_mutex->csection );
 249         return 0;
 250     }
 251
 252 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 253 #   if defined(DEBUG) && defined(SYS_LINUX)
 254     {
 255         /* Create error-checking mutex to detect problems more easily. */
 256         pthread_mutexattr_t attr;
 257         int                 i_result;
 258
 259         pthread_mutexattr_init( &attr );
 260         pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_ERRORCHECK_NP );
 261         i_result = pthread_mutex_init( &p_mutex->mutex, &attr );
 262         pthread_mutexattr_destroy( &attr );
 263         return( i_result );
 264     }
 265 #   endif
 266     return pthread_mutex_init( &p_mutex->mutex, NULL );
 267
 268 #elif defined( HAVE_CTHREADS_H )
 269     mutex_init( p_mutex );
 270     return 0;
 271
 272 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 273     /* check the arguments and whether it's already been initialized */
 274     if( p_mutex == NULL )
 275     {
 276         return B_BAD_VALUE;
 277     }
 278
 279     if( p_mutex->init == 9999 )
 280     {
 281         return EALREADY;
 282     }
 283
 284     p_mutex->lock = create_sem( 1, "BeMutex" );
 285     if( p_mutex->lock < B_NO_ERROR )
 286     {
 287         return( -1 );
 288     }
 289
 290     p_mutex->init = 9999;
 291     return B_OK;
 292
 293 #endif
 294 }
 295
 296 /*****************************************************************************
 297  * vlc_mutex_destroy: destroy a mutex, inner version
 298  *****************************************************************************/
 299 int __vlc_mutex_destroy( char * psz_file, int i_line, vlc_mutex_t *p_mutex )
 300 {
 301     int i_result;
 302     /* In case of error : */
 303     int i_thread = -1;
 304     const char * psz_error = "";
 305
 306 #if defined( PTH_INIT_IN_PTH_H )
 307     return 0;
 308
 309 #elif defined( ST_INIT_IN_ST_H )
 310     i_result = st_mutex_destroy( p_mutex->mutex );
 311
 312 #elif defined( UNDER_CE )
 313     DeleteCriticalSection( &p_mutex->csection );
 314     return 0;
 315
 316 #elif defined( WIN32 )
 317     if( p_mutex->mutex )
 318     {
 319         CloseHandle( p_mutex->mutex );
 320     }
 321     else
 322     {
 323         DeleteCriticalSection( &p_mutex->csection );
 324     }
 325     return 0;
 326
 327 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 328     i_result = pthread_mutex_destroy( &p_mutex->mutex );
 329     if ( i_result )
 330     {
 331         i_thread = (int)pthread_self();
 332         psz_error = strerror(i_result);
 333     }
 334
 335 #elif defined( HAVE_CTHREADS_H )
 336     return 0;
 337
 338 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 339     if( p_mutex->init == 9999 )
 340     {
 341         delete_sem( p_mutex->lock );
 342     }
 343
 344     p_mutex->init = 0;
 345     return B_OK;
 346 #endif
 347
 348     if( i_result )
 349     {
 350         msg_Err( p_mutex->p_this,
 351                  "thread %d: mutex_destroy failed at %s:%d (%d:%s)",
 352                  i_thread, psz_file, i_line, i_result, psz_error );
 353     }
 354     return i_result;
 355 }
 356
 357 /*****************************************************************************
 358  * vlc_cond_init: initialize a condition
 359  *****************************************************************************/
 360 int __vlc_cond_init( vlc_object_t *p_this, vlc_cond_t *p_condvar )
 361 {
 362     p_condvar->p_this = p_this;
 363
 364 #if defined( PTH_INIT_IN_PTH_H )
 365     return ( pth_cond_init( &p_condvar->cond ) == FALSE );
 366
 367 #elif defined( ST_INIT_IN_ST_H )
 368     p_condvar->cond = st_cond_new();
 369     return ( p_condvar->cond == NULL ) ? errno : 0;
 370
 371 #elif defined( UNDER_CE )
 372     /* Initialize counter */
 373     p_condvar->i_waiting_threads = 0;
 374
 375     /* Create an auto-reset event. */
 376     p_condvar->event = CreateEvent( NULL,   /* no security */
 377                                     FALSE,  /* auto-reset event */
 378                                     FALSE,  /* start non-signaled */
 379                                     NULL ); /* unnamed */
 380     return !p_condvar->event;
 381
 382 #elif defined( WIN32 )
 383     /* Initialize counter */
 384     p_condvar->i_waiting_threads = 0;
 385
 386     /* Misc init */
 387     p_condvar->i_win9x_cv = p_this->p_libvlc->i_win9x_cv;
 388     p_condvar->SignalObjectAndWait = p_this->p_libvlc->SignalObjectAndWait;
 389
 390     if( (p_condvar->SignalObjectAndWait && !p_this->p_libvlc->b_fast_mutex)
 391         || p_condvar->i_win9x_cv == 0 )
 392     {
 393         /* Create an auto-reset event. */
 394         p_condvar->event = CreateEvent( NULL,   /* no security */
 395                                         FALSE,  /* auto-reset event */
 396                                         FALSE,  /* start non-signaled */
 397                                         NULL ); /* unnamed */
 398
 399         p_condvar->semaphore = NULL;
 400         return !p_condvar->event;
 401     }
 402     else
 403     {
 404         p_condvar->semaphore = CreateSemaphore( NULL,       /* no security */
 405                                                 0,          /* initial count */
 406                                                 0x7fffffff, /* max count */
 407                                                 NULL );     /* unnamed */
 408
 409         if( p_condvar->i_win9x_cv == 1 )
 410             /* Create a manual-reset event initially signaled. */
 411             p_condvar->event = CreateEvent( NULL, TRUE, TRUE, NULL );
 412         else
 413             /* Create a auto-reset event. */
 414             p_condvar->event = CreateEvent( NULL, FALSE, FALSE, NULL );
 415
 416         InitializeCriticalSection( &p_condvar->csection );
 417
 418         return !p_condvar->semaphore || !p_condvar->event;
 419     }
 420
 421 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 422     return pthread_cond_init( &p_condvar->cond, NULL );
 423
 424 #elif defined( HAVE_CTHREADS_H )
 425     /* condition_init() */
 426     spin_lock_init( &p_condvar->lock );
 427     cthread_queue_init( &p_condvar->queue );
 428     p_condvar->name = 0;
 429     p_condvar->implications = 0;
 430
 431     return 0;
 432
 433 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 434     if( !p_condvar )
 435     {
 436         return B_BAD_VALUE;
 437     }
 438
 439     if( p_condvar->init == 9999 )
 440     {
 441         return EALREADY;
 442     }
 443
 444     p_condvar->thread = -1;
 445     p_condvar->init = 9999;
 446     return 0;
 447 #endif
 448 }
 449
 450 /*****************************************************************************
 451  * vlc_cond_destroy: destroy a condition, inner version
 452  *****************************************************************************/
 453 int __vlc_cond_destroy( char * psz_file, int i_line, vlc_cond_t *p_condvar )
 454 {
 455     int i_result;
 456     /* In case of error : */
 457     int i_thread = -1;
 458     const char * psz_error = "";
 459
 460 #if defined( PTH_INIT_IN_PTH_H )
 461     return 0;
 462
 463 #elif defined( ST_INIT_IN_ST_H )
 464     i_result = st_cond_destroy( p_condvar->cond );
 465
 466 #elif defined( UNDER_CE )
 467     i_result = !CloseHandle( p_condvar->event );
 468
 469 #elif defined( WIN32 )
 470     if( !p_condvar->semaphore )
 471         i_result = !CloseHandle( p_condvar->event );
 472     else
 473         i_result = !CloseHandle( p_condvar->event )
 474           || !CloseHandle( p_condvar->semaphore );
 475
 476 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 477     i_result = pthread_cond_destroy( &p_condvar->cond );
 478     if ( i_result )
 479     {
 480         i_thread = (int)pthread_self();
 481         psz_error = strerror(i_result);
 482     }
 483
 484 #elif defined( HAVE_CTHREADS_H )
 485     return 0;
 486
 487 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 488     p_condvar->init = 0;
 489     return 0;
 490 #endif
 491
 492     if( i_result )
 493     {
 494         msg_Err( p_condvar->p_this,
 495                  "thread %d: cond_destroy failed at %s:%d (%d:%s)",
 496                  i_thread, psz_file, i_line, i_result, psz_error );
 497     }
 498     return i_result;
 499 }
 500
 501 /*****************************************************************************
 502  * vlc_thread_create: create a thread, inner version
 503  *****************************************************************************
 504  * Note that i_priority is only taken into account on platforms supporting
 505  * userland real-time priority threads.
 506  *****************************************************************************/
 507 int __vlc_thread_create( vlc_object_t *p_this, char * psz_file, int i_line,
 508                          char *psz_name, void * ( *func ) ( void * ),
 509                          int i_priority, vlc_bool_t b_wait )
 510 {
 511     int i_ret;
 512     void *p_data = (void *)p_this;
 513
 514     vlc_mutex_lock( &p_this->object_lock );
 515
 516 #if defined( PTH_INIT_IN_PTH_H )
 517     p_this->thread_id = pth_spawn( PTH_ATTR_DEFAULT, func, p_data );
 518     i_ret = p_this->thread_id == NULL;
 519
 520 #elif defined( ST_INIT_IN_ST_H )
 521     p_this->thread_id = st_thread_create( func, p_data, 1, 0 );
 522     i_ret = 0;
 523
 524 #elif defined( WIN32 ) || defined( UNDER_CE )
 525     {
 526         unsigned threadID;
 527         /* When using the MSVCRT C library you have to use the _beginthreadex
 528          * function instead of CreateThread, otherwise you'll end up with
 529          * memory leaks and the signal functions not working (see Microsoft
 530          * Knowledge Base, article 104641) */
 531         p_this->thread_id =
 532 #if defined( UNDER_CE )
 533                 (HANDLE)CreateThread( NULL, 0, (PTHREAD_START) func,
 534                                       p_data, 0, &threadID );
 535 #else
 536                 (HANDLE)_beginthreadex( NULL, 0, (PTHREAD_START) func,
 537                                         p_data, 0, &threadID );
 538 #endif
 539     }
 540
 541     if ( p_this->thread_id && i_priority )
 542     {
 543         if ( !SetThreadPriority(p_this->thread_id, i_priority) )
 544         {
 545             msg_Warn( p_this, "couldn't set a faster priority" );
 546             i_priority = 0;
 547         }
 548     }
 549
 550     i_ret = ( p_this->thread_id ? 0 : 1 );
 551
 552 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 553     i_ret = pthread_create( &p_this->thread_id, NULL, func, p_data );
 554
 555 #ifdef SYS_DARWIN
 556     if ( i_priority )
 557     {
 558         int i_error, i_policy;
 559         struct sched_param param;
 560         memset( &param, 0, sizeof(struct sched_param) );
 561         if ( i_priority < 0 )
 562         {
 563             param.sched_priority = (-1) * i_priority;
 564             i_policy = SCHED_OTHER;
 565         }
 566         else
 567         {
 568             param.sched_priority = i_priority;
 569             i_policy = SCHED_RR;
 570         }
 571         if ( (i_error = pthread_setschedparam( p_this->thread_id,
 572                                                i_policy, &param )) )
 573         {
 574             msg_Warn( p_this, "couldn't set thread priority (%s:%d): %s",
 575                       psz_file, i_line, strerror(i_error) );
 576             i_priority = 0;
 577         }
 578     }
 579 #endif
 580
 581 #elif defined( HAVE_CTHREADS_H )
 582     p_this->thread_id = cthread_fork( (cthread_fn_t)func, (any_t)p_data );
 583     i_ret = 0;
 584
 585 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 586     p_this->thread_id = spawn_thread( (thread_func)func, psz_name,
 587                                       i_priority, p_data );
 588     i_ret = resume_thread( p_this->thread_id );
 589
 590 #endif
 591
 592     if( i_ret == 0 )
 593     {
 594         if( b_wait )
 595         {
 596             msg_Dbg( p_this, "waiting for thread completion" );
 597             vlc_cond_wait( &p_this->object_wait, &p_this->object_lock );
 598         }
 599
 600         p_this->b_thread = 1;
 601
 602         msg_Dbg( p_this, "thread %d (%s) created at priority %d (%s:%d)",
 603                  (int)p_this->thread_id, psz_name, i_priority,
 604                  psz_file, i_line );
 605
 606         vlc_mutex_unlock( &p_this->object_lock );
 607     }
 608     else
 609     {
 610 #ifdef HAVE_STRERROR
 611         msg_Err( p_this, "%s thread could not be created at %s:%d (%s)",
 612                          psz_name, psz_file, i_line, strerror(i_ret) );
 613 #else
 614         msg_Err( p_this, "%s thread could not be created at %s:%d",
 615                          psz_name, psz_file, i_line );
 616 #endif
 617         vlc_mutex_unlock( &p_this->object_lock );
 618     }
 619
 620     return i_ret;
 621 }
 622
 623 /*****************************************************************************
 624  * vlc_thread_set_priority: set the priority of the current thread when we
 625  * couldn't set it in vlc_thread_create (for instance for the main thread)
 626  *****************************************************************************/
 627 int __vlc_thread_set_priority( vlc_object_t *p_this, char * psz_file,
 628                                int i_line, int i_priority )
 629 {
 630 #if defined( PTH_INIT_IN_PTH_H ) || defined( ST_INIT_IN_ST_H )
 631 #elif defined( WIN32 ) || defined( UNDER_CE )
 632     if ( !SetThreadPriority(GetCurrentThread(), i_priority) )
 633     {
 634         msg_Warn( p_this, "couldn't set a faster priority" );
 635         return 1;
 636     }
 637
 638 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 639
 640 #ifdef SYS_DARWIN
 641     if ( i_priority )
 642     {
 643         int i_error, i_policy;
 644         struct sched_param param;
 645         memset( &param, 0, sizeof(struct sched_param) );
 646         if ( i_priority < 0 )
 647         {
 648             param.sched_priority = (-1) * i_priority;
 649             i_policy = SCHED_OTHER;
 650         }
 651         else
 652         {
 653             param.sched_priority = i_priority;
 654             i_policy = SCHED_RR;
 655         }
 656         if ( (i_error = pthread_setschedparam( pthread_self(),
 657                                                i_policy, &param )) )
 658         {
 659             msg_Warn( p_this, "couldn't set thread priority (%s:%d): %s",
 660                       psz_file, i_line, strerror(i_error) );
 661             i_priority = 0;
 662         }
 663     }
 664 #endif
 665
 666 #endif
 667
 668     return 0;
 669 }
 670
 671 /*****************************************************************************
 672  * vlc_thread_ready: tell the parent thread we were successfully spawned
 673  *****************************************************************************/
 674 void __vlc_thread_ready( vlc_object_t *p_this )
 675 {
 676     vlc_mutex_lock( &p_this->object_lock );
 677     vlc_cond_signal( &p_this->object_wait );
 678     vlc_mutex_unlock( &p_this->object_lock );
 679 }
 680
 681 /*****************************************************************************
 682  * vlc_thread_join: wait until a thread exits, inner version
 683  *****************************************************************************/
 684 void __vlc_thread_join( vlc_object_t *p_this, char * psz_file, int i_line )
 685 {
 686     int i_ret = 0;
 687
 688 #if defined( PTH_INIT_IN_PTH_H )
 689     i_ret = ( pth_join( p_this->thread_id, NULL ) == FALSE );
 690
 691 #elif defined( ST_INIT_IN_ST_H )
 692     i_ret = st_thread_join( p_this->thread_id, NULL );
 693
 694 #elif defined( UNDER_CE )
 695     WaitForSingleObject( p_this->thread_id, INFINITE );
 696
 697 #elif defined( WIN32 )
 698     WaitForSingleObject( p_this->thread_id, INFINITE );
 699
 700 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 701     i_ret = pthread_join( p_this->thread_id, NULL );
 702
 703 #elif defined( HAVE_CTHREADS_H )
 704     cthread_join( p_this->thread_id );
 705     i_ret = 1;
 706
 707 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 708     int32_t exit_value;
 709     wait_for_thread( p_this->thread_id, &exit_value );
 710
 711 #endif
 712
 713     if( i_ret )
 714     {
 715 #ifdef HAVE_STRERROR
 716         msg_Err( p_this, "thread_join(%d) failed at %s:%d (%s)",
 717                          (int)p_this->thread_id, psz_file, i_line,
 718                          strerror(i_ret) );
 719 #else
 720         msg_Err( p_this, "thread_join(%d) failed at %s:%d",
 721                          (int)p_this->thread_id, psz_file, i_line );
 722 #endif
 723     }
 724     else
 725     {
 726         msg_Dbg( p_this, "thread %d joined (%s:%d)",
 727                          (int)p_this->thread_id, psz_file, i_line );
 728     }
 729
 730     p_this->b_thread = 0;
 731 }
 732