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

   1 /*****************************************************************************
   2  * threads.c : threads implementation for the VideoLAN client
   3  *****************************************************************************
   4  * Copyright (C) 1999-2004 VideoLAN
   5  * $Id: threads.c,v 1.47 2004/02/22 15:41:27 massiot Exp $
   6  *
   7  * Authors: Jean-Marc Dressler <polux@via.ecp.fr>
   8  *          Samuel Hocevar <sam@zoy.org>
   9  *          Gildas Bazin <gbazin@netcourrier.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  24  *****************************************************************************/
  25
  26 #include <vlc/vlc.h>
  27
  28 #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( HAVE_KERNEL_SCHEDULER_H )
  45 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
  46     static pthread_mutex_t once_mutex = PTHREAD_MUTEX_INITIALIZER;
  47 #elif defined( HAVE_CTHREADS_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( HAVE_KERNEL_SCHEDULER_H )
  85 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
  86     pthread_mutex_lock( &once_mutex );
  87 #elif defined( HAVE_CTHREADS_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( HAVE_KERNEL_SCHEDULER_H )
 128 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 129 #elif defined( HAVE_CTHREADS_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( HAVE_KERNEL_SCHEDULER_H )
 161     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 162 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 163     pthread_mutex_unlock( &once_mutex );
 164 #elif defined( HAVE_CTHREADS_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( HAVE_KERNEL_SCHEDULER_H )
 201     i_initializations--;
 202
 203 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 204     pthread_mutex_lock( &once_mutex );
 205     i_initializations--;
 206     pthread_mutex_unlock( &once_mutex );
 207
 208 #elif defined( HAVE_CTHREADS_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( HAVE_KERNEL_SCHEDULER_H )
 253     /* check the arguments and whether it's already been initialized */
 254     if( p_mutex == NULL )
 255     {
 256         return B_BAD_VALUE;
 257     }
 258
 259     if( p_mutex->init == 9999 )
 260     {
 261         return EALREADY;
 262     }
 263
 264     p_mutex->lock = create_sem( 1, "BeMutex" );
 265     if( p_mutex->lock < B_NO_ERROR )
 266     {
 267         return( -1 );
 268     }
 269
 270     p_mutex->init = 9999;
 271     return B_OK;
 272
 273 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 274 #   if defined(DEBUG) && defined(SYS_LINUX)
 275     {
 276         /* Create error-checking mutex to detect problems more easily. */
 277         pthread_mutexattr_t attr;
 278         int                 i_result;
 279
 280         pthread_mutexattr_init( &attr );
 281         pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_ERRORCHECK_NP );
 282         i_result = pthread_mutex_init( &p_mutex->mutex, &attr );
 283         pthread_mutexattr_destroy( &attr );
 284         return( i_result );
 285     }
 286 #   endif
 287     return pthread_mutex_init( &p_mutex->mutex, NULL );
 288
 289 #elif defined( HAVE_CTHREADS_H )
 290     mutex_init( p_mutex );
 291     return 0;
 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( HAVE_KERNEL_SCHEDULER_H )
 328     if( p_mutex->init == 9999 )
 329     {
 330         delete_sem( p_mutex->lock );
 331     }
 332
 333     p_mutex->init = 0;
 334     return B_OK;
 335
 336 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 337     i_result = pthread_mutex_destroy( &p_mutex->mutex );
 338     if ( i_result )
 339     {
 340         i_thread = (int)pthread_self();
 341         psz_error = strerror(i_result);
 342     }
 343
 344 #elif defined( HAVE_CTHREADS_H )
 345     return 0;
 346
 347 #endif
 348
 349     if( i_result )
 350     {
 351         msg_Err( p_mutex->p_this,
 352                  "thread %d: mutex_destroy failed at %s:%d (%d:%s)",
 353                  i_thread, psz_file, i_line, i_result, psz_error );
 354     }
 355     return i_result;
 356 }
 357
 358 /*****************************************************************************
 359  * vlc_cond_init: initialize a condition
 360  *****************************************************************************/
 361 int __vlc_cond_init( vlc_object_t *p_this, vlc_cond_t *p_condvar )
 362 {
 363     p_condvar->p_this = p_this;
 364
 365 #if defined( PTH_INIT_IN_PTH_H )
 366     return ( pth_cond_init( &p_condvar->cond ) == FALSE );
 367
 368 #elif defined( ST_INIT_IN_ST_H )
 369     p_condvar->cond = st_cond_new();
 370     return ( p_condvar->cond == NULL ) ? errno : 0;
 371
 372 #elif defined( UNDER_CE )
 373     /* Initialize counter */
 374     p_condvar->i_waiting_threads = 0;
 375
 376     /* Create an auto-reset event. */
 377     p_condvar->event = CreateEvent( NULL,   /* no security */
 378                                     FALSE,  /* auto-reset event */
 379                                     FALSE,  /* start non-signaled */
 380                                     NULL ); /* unnamed */
 381     return !p_condvar->event;
 382
 383 #elif defined( WIN32 )
 384     /* Initialize counter */
 385     p_condvar->i_waiting_threads = 0;
 386
 387     /* Misc init */
 388     p_condvar->i_win9x_cv = p_this->p_libvlc->i_win9x_cv;
 389     p_condvar->SignalObjectAndWait = p_this->p_libvlc->SignalObjectAndWait;
 390
 391     if( (p_condvar->SignalObjectAndWait && !p_this->p_libvlc->b_fast_mutex)
 392         || p_condvar->i_win9x_cv == 0 )
 393     {
 394         /* Create an auto-reset event. */
 395         p_condvar->event = CreateEvent( NULL,   /* no security */
 396                                         FALSE,  /* auto-reset event */
 397                                         FALSE,  /* start non-signaled */
 398                                         NULL ); /* unnamed */
 399
 400         p_condvar->semaphore = NULL;
 401         return !p_condvar->event;
 402     }
 403     else
 404     {
 405         p_condvar->semaphore = CreateSemaphore( NULL,       /* no security */
 406                                                 0,          /* initial count */
 407                                                 0x7fffffff, /* max count */
 408                                                 NULL );     /* unnamed */
 409
 410         if( p_condvar->i_win9x_cv == 1 )
 411             /* Create a manual-reset event initially signaled. */
 412             p_condvar->event = CreateEvent( NULL, TRUE, TRUE, NULL );
 413         else
 414             /* Create a auto-reset event. */
 415             p_condvar->event = CreateEvent( NULL, FALSE, FALSE, NULL );
 416
 417         InitializeCriticalSection( &p_condvar->csection );
 418
 419         return !p_condvar->semaphore || !p_condvar->event;
 420     }
 421
 422 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 423     if( !p_condvar )
 424     {
 425         return B_BAD_VALUE;
 426     }
 427
 428     if( p_condvar->init == 9999 )
 429     {
 430         return EALREADY;
 431     }
 432
 433     p_condvar->thread = -1;
 434     p_condvar->init = 9999;
 435     return 0;
 436
 437 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 438     return pthread_cond_init( &p_condvar->cond, NULL );
 439
 440 #elif defined( HAVE_CTHREADS_H )
 441     /* condition_init() */
 442     spin_lock_init( &p_condvar->lock );
 443     cthread_queue_init( &p_condvar->queue );
 444     p_condvar->name = 0;
 445     p_condvar->implications = 0;
 446
 447     return 0;
 448
 449 #endif
 450 }
 451
 452 /*****************************************************************************
 453  * vlc_cond_destroy: destroy a condition, inner version
 454  *****************************************************************************/
 455 int __vlc_cond_destroy( char * psz_file, int i_line, vlc_cond_t *p_condvar )
 456 {
 457     int i_result;
 458     /* In case of error : */
 459     int i_thread = -1;
 460     const char * psz_error = "";
 461
 462 #if defined( PTH_INIT_IN_PTH_H )
 463     return 0;
 464
 465 #elif defined( ST_INIT_IN_ST_H )
 466     i_result = st_cond_destroy( p_condvar->cond );
 467
 468 #elif defined( UNDER_CE )
 469     i_result = !CloseHandle( p_condvar->event );
 470
 471 #elif defined( WIN32 )
 472     if( !p_condvar->semaphore )
 473         i_result = !CloseHandle( p_condvar->event );
 474     else
 475         i_result = !CloseHandle( p_condvar->event )
 476           || !CloseHandle( p_condvar->semaphore );
 477
 478 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 479     p_condvar->init = 0;
 480     return 0;
 481
 482 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 483     i_result = pthread_cond_destroy( &p_condvar->cond );
 484     if ( i_result )
 485     {
 486         i_thread = (int)pthread_self();
 487         psz_error = strerror(i_result);
 488     }
 489
 490 #elif defined( HAVE_CTHREADS_H )
 491     return 0;
 492
 493 #endif
 494
 495     if( i_result )
 496     {
 497         msg_Err( p_condvar->p_this,
 498                  "thread %d: cond_destroy failed at %s:%d (%d:%s)",
 499                  i_thread, psz_file, i_line, i_result, psz_error );
 500     }
 501     return i_result;
 502 }
 503
 504 /*****************************************************************************
 505  * vlc_thread_create: create a thread, inner version
 506  *****************************************************************************
 507  * Note that i_priority is only taken into account on platforms supporting
 508  * userland real-time priority threads.
 509  *****************************************************************************/
 510 int __vlc_thread_create( vlc_object_t *p_this, char * psz_file, int i_line,
 511                          char *psz_name, void * ( *func ) ( void * ),
 512                          int i_priority, vlc_bool_t b_wait )
 513 {
 514     int i_ret;
 515     void *p_data = (void *)p_this;
 516
 517     vlc_mutex_lock( &p_this->object_lock );
 518
 519 #if defined( PTH_INIT_IN_PTH_H )
 520     p_this->thread_id = pth_spawn( PTH_ATTR_DEFAULT, func, p_data );
 521     i_ret = p_this->thread_id == NULL;
 522
 523 #elif defined( ST_INIT_IN_ST_H )
 524     p_this->thread_id = st_thread_create( func, p_data, 1, 0 );
 525     i_ret = 0;
 526
 527 #elif defined( WIN32 ) || defined( UNDER_CE )
 528     {
 529         unsigned threadID;
 530         /* When using the MSVCRT C library you have to use the _beginthreadex
 531          * function instead of CreateThread, otherwise you'll end up with
 532          * memory leaks and the signal functions not working (see Microsoft
 533          * Knowledge Base, article 104641) */
 534         p_this->thread_id =
 535 #if defined( UNDER_CE )
 536                 (HANDLE)CreateThread( NULL, 0, (PTHREAD_START) func,
 537                                       p_data, 0, &threadID );
 538 #else
 539                 (HANDLE)_beginthreadex( NULL, 0, (PTHREAD_START) func,
 540                                         p_data, 0, &threadID );
 541 #endif
 542     }
 543
 544     if ( p_this->thread_id && i_priority )
 545     {
 546         if ( !SetThreadPriority(p_this->thread_id, i_priority) )
 547         {
 548             msg_Warn( p_this, "couldn't set a faster priority" );
 549             i_priority = 0;
 550         }
 551     }
 552
 553     i_ret = ( p_this->thread_id ? 0 : 1 );
 554
 555 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 556     p_this->thread_id = spawn_thread( (thread_func)func, psz_name,
 557                                       i_priority, p_data );
 558     i_ret = resume_thread( p_this->thread_id );
 559
 560 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 561     i_ret = pthread_create( &p_this->thread_id, NULL, func, p_data );
 562
 563     if ( i_priority
 564 #ifndef SYS_DARWIN
 565             && config_GetInt( p_this, "rt-priority" )
 566 #endif
 567        )
 568     {
 569         int i_error, i_policy;
 570         struct sched_param param;
 571
 572         memset( &param, 0, sizeof(struct sched_param) );
 573         i_priority += config_GetInt( p_this, "rt-offset" );
 574         if ( i_priority < 0 )
 575         {
 576             param.sched_priority = (-1) * i_priority;
 577             i_policy = SCHED_OTHER;
 578         }
 579         else
 580         {
 581             param.sched_priority = i_priority;
 582             i_policy = SCHED_RR;
 583         }
 584         if ( (i_error = pthread_setschedparam( p_this->thread_id,
 585                                                i_policy, &param )) )
 586         {
 587             msg_Warn( p_this, "couldn't set thread priority (%s:%d): %s",
 588                       psz_file, i_line, strerror(i_error) );
 589             i_priority = 0;
 590         }
 591     }
 592     else
 593     {
 594         i_priority = 0;
 595     }
 596
 597 #elif defined( HAVE_CTHREADS_H )
 598     p_this->thread_id = cthread_fork( (cthread_fn_t)func, (any_t)p_data );
 599     i_ret = 0;
 600
 601 #endif
 602
 603     if( i_ret == 0 )
 604     {
 605         if( b_wait )
 606         {
 607             msg_Dbg( p_this, "waiting for thread completion" );
 608             vlc_cond_wait( &p_this->object_wait, &p_this->object_lock );
 609         }
 610
 611         p_this->b_thread = 1;
 612
 613         msg_Dbg( p_this, "thread %d (%s) created at priority %d (%s:%d)",
 614                  (int)p_this->thread_id, psz_name, i_priority,
 615                  psz_file, i_line );
 616
 617         vlc_mutex_unlock( &p_this->object_lock );
 618     }
 619     else
 620     {
 621 #ifdef HAVE_STRERROR
 622         msg_Err( p_this, "%s thread could not be created at %s:%d (%s)",
 623                          psz_name, psz_file, i_line, strerror(i_ret) );
 624 #else
 625         msg_Err( p_this, "%s thread could not be created at %s:%d",
 626                          psz_name, psz_file, i_line );
 627 #endif
 628         vlc_mutex_unlock( &p_this->object_lock );
 629     }
 630
 631     return i_ret;
 632 }
 633
 634 /*****************************************************************************
 635  * vlc_thread_set_priority: set the priority of the current thread when we
 636  * couldn't set it in vlc_thread_create (for instance for the main thread)
 637  *****************************************************************************/
 638 int __vlc_thread_set_priority( vlc_object_t *p_this, char * psz_file,
 639                                int i_line, int i_priority )
 640 {
 641 #if defined( PTH_INIT_IN_PTH_H ) || defined( ST_INIT_IN_ST_H )
 642 #elif defined( WIN32 ) || defined( UNDER_CE )
 643     if ( !SetThreadPriority(GetCurrentThread(), i_priority) )
 644     {
 645         msg_Warn( p_this, "couldn't set a faster priority" );
 646         return 1;
 647     }
 648
 649 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 650     if ( i_priority
 651 #ifndef SYS_DARWIN
 652             && config_GetInt( p_this, "rt-priority" )
 653 #endif
 654         )
 655     {
 656         int i_error, i_policy;
 657         struct sched_param param;
 658
 659         memset( &param, 0, sizeof(struct sched_param) );
 660         i_priority += config_GetInt( p_this, "rt-offset" );
 661         if ( i_priority < 0 )
 662         {
 663             param.sched_priority = (-1) * i_priority;
 664             i_policy = SCHED_OTHER;
 665         }
 666         else
 667         {
 668             param.sched_priority = i_priority;
 669             i_policy = SCHED_RR;
 670         }
 671         if ( !p_this->thread_id )
 672             p_this->thread_id = pthread_self();
 673         if ( (i_error = pthread_setschedparam( p_this->thread_id,
 674                                                i_policy, &param )) )
 675         {
 676             msg_Warn( p_this, "couldn't set thread priority (%s:%d): %s",
 677                       psz_file, i_line, strerror(i_error) );
 678             i_priority = 0;
 679         }
 680     }
 681 #endif
 682
 683     return 0;
 684 }
 685
 686 /*****************************************************************************
 687  * vlc_thread_ready: tell the parent thread we were successfully spawned
 688  *****************************************************************************/
 689 void __vlc_thread_ready( vlc_object_t *p_this )
 690 {
 691     vlc_mutex_lock( &p_this->object_lock );
 692     vlc_cond_signal( &p_this->object_wait );
 693     vlc_mutex_unlock( &p_this->object_lock );
 694 }
 695
 696 /*****************************************************************************
 697  * vlc_thread_join: wait until a thread exits, inner version
 698  *****************************************************************************/
 699 void __vlc_thread_join( vlc_object_t *p_this, char * psz_file, int i_line )
 700 {
 701     int i_ret = 0;
 702
 703 #if defined( PTH_INIT_IN_PTH_H )
 704     i_ret = ( pth_join( p_this->thread_id, NULL ) == FALSE );
 705
 706 #elif defined( ST_INIT_IN_ST_H )
 707     i_ret = st_thread_join( p_this->thread_id, NULL );
 708
 709 #elif defined( UNDER_CE )
 710     WaitForSingleObject( p_this->thread_id, INFINITE );
 711
 712 #elif defined( WIN32 )
 713     WaitForSingleObject( p_this->thread_id, INFINITE );
 714
 715 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 716     int32_t exit_value;
 717     wait_for_thread( p_this->thread_id, &exit_value );
 718
 719 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 720     i_ret = pthread_join( p_this->thread_id, NULL );
 721
 722 #elif defined( HAVE_CTHREADS_H )
 723     cthread_join( p_this->thread_id );
 724     i_ret = 1;
 725
 726 #endif
 727
 728     if( i_ret )
 729     {
 730 #ifdef HAVE_STRERROR
 731         msg_Err( p_this, "thread_join(%d) failed at %s:%d (%s)",
 732                          (int)p_this->thread_id, psz_file, i_line,
 733                          strerror(i_ret) );
 734 #else
 735         msg_Err( p_this, "thread_join(%d) failed at %s:%d",
 736                          (int)p_this->thread_id, psz_file, i_line );
 737 #endif
 738     }
 739     else
 740     {
 741         msg_Dbg( p_this, "thread %d joined (%s:%d)",
 742                          (int)p_this->thread_id, psz_file, i_line );
 743     }
 744
 745     p_this->b_thread = 0;
 746 }
 747