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 the VideoLAN team
   5  * $Id$
   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 unsigned i_initializations = 0;
  39 static volatile int i_status = VLC_THREADS_UNINITIALIZED;
  40 static vlc_object_t *p_root;
  41
  42 #if defined( PTH_INIT_IN_PTH_H )
  43 #elif defined( ST_INIT_IN_ST_H )
  44 #elif defined( UNDER_CE )
  45 #elif defined( WIN32 )
  46 #elif defined( HAVE_KERNEL_SCHEDULER_H )
  47 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
  48     static pthread_mutex_t once_mutex = PTHREAD_MUTEX_INITIALIZER;
  49 #elif defined( HAVE_CTHREADS_H )
  50 #endif
  51
  52 /*****************************************************************************
  53  * Global variable for named mutexes
  54  *****************************************************************************/
  55 typedef struct vlc_namedmutex_t vlc_namedmutex_t;
  56 struct vlc_namedmutex_t
  57 {
  58     vlc_mutex_t lock;
  59
  60     char *psz_name;
  61     int i_usage;
  62     vlc_namedmutex_t *p_next;
  63 };
  64
  65 /*****************************************************************************
  66  * vlc_threads_init: initialize threads system
  67  *****************************************************************************
  68  * This function requires lazy initialization of a global lock in order to
  69  * keep the library really thread-safe. Some architectures don't support this
  70  * and thus do not guarantee the complete reentrancy.
  71  *****************************************************************************/
  72 int __vlc_threads_init( vlc_object_t *p_this )
  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 #elif defined( HAVE_KERNEL_SCHEDULER_H )
  84 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
  85     pthread_mutex_lock( &once_mutex );
  86 #elif defined( HAVE_CTHREADS_H )
  87 #endif
  88
  89     if( i_status == VLC_THREADS_UNINITIALIZED )
  90     {
  91         i_status = VLC_THREADS_PENDING;
  92
  93         /* We should be safe now. Do all the initialization stuff we want. */
  94         p_libvlc->b_ready = VLC_FALSE;
  95
  96 #if defined( PTH_INIT_IN_PTH_H )
  97         i_ret = ( pth_init() == FALSE );
  98
  99 #elif defined( ST_INIT_IN_ST_H )
 100         i_ret = st_init();
 101
 102 #elif defined( UNDER_CE )
 103         /* Nothing to initialize */
 104
 105 #elif defined( WIN32 )
 106         /* Dynamically get the address of SignalObjectAndWait */
 107         if( GetVersion() < 0x80000000 )
 108         {
 109             HINSTANCE hInstLib;
 110
 111             /* We are running on NT/2K/XP, we can use SignalObjectAndWait */
 112             hInstLib = LoadLibrary( "kernel32" );
 113             if( hInstLib )
 114             {
 115                 p_libvlc->SignalObjectAndWait =
 116                     (SIGNALOBJECTANDWAIT)GetProcAddress( hInstLib,
 117                                                      "SignalObjectAndWait" );
 118             }
 119         }
 120         else
 121         {
 122             p_libvlc->SignalObjectAndWait = NULL;
 123         }
 124
 125         p_libvlc->b_fast_mutex = 0;
 126         p_libvlc->i_win9x_cv = 0;
 127
 128 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 129 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 130 #elif defined( HAVE_CTHREADS_H )
 131 #endif
 132
 133         p_root = vlc_object_create( p_libvlc, VLC_OBJECT_ROOT );
 134         if( p_root == NULL )
 135             i_ret = VLC_ENOMEM;
 136
 137         if( i_ret )
 138         {
 139             i_status = VLC_THREADS_ERROR;
 140         }
 141         else
 142         {
 143             i_initializations++;
 144             i_status = VLC_THREADS_READY;
 145         }
 146     }
 147     else
 148     {
 149         /* Just increment the initialization count */
 150         i_initializations++;
 151     }
 152
 153     /* If we have lazy mutex initialization support, unlock the mutex;
 154      * otherwize, do a naive wait loop. */
 155 #if defined( PTH_INIT_IN_PTH_H )
 156     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 157 #elif defined( ST_INIT_IN_ST_H )
 158     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 159 #elif defined( UNDER_CE )
 160     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 161 #elif defined( WIN32 )
 162     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 163 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 164     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 165 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 166     pthread_mutex_unlock( &once_mutex );
 167 #elif defined( HAVE_CTHREADS_H )
 168     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 169 #endif
 170
 171     if( i_status != VLC_THREADS_READY )
 172     {
 173         return VLC_ETHREAD;
 174     }
 175
 176     return i_ret;
 177 }
 178
 179 /*****************************************************************************
 180  * vlc_threads_end: stop threads system
 181  *****************************************************************************
 182  * FIXME: This function is far from being threadsafe.
 183  *****************************************************************************/
 184 int __vlc_threads_end( vlc_object_t *p_this )
 185 {
 186 #if defined( PTH_INIT_IN_PTH_H )
 187 #elif defined( ST_INIT_IN_ST_H )
 188 #elif defined( UNDER_CE )
 189 #elif defined( WIN32 )
 190 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 191 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 192     pthread_mutex_lock( &once_mutex );
 193 #elif defined( HAVE_CTHREADS_H )
 194 #endif
 195
 196     if( i_initializations == 0 )
 197         return VLC_EGENERIC;
 198
 199     i_initializations--;
 200     if( i_initializations == 0 )
 201     {
 202         i_status = VLC_THREADS_UNINITIALIZED;
 203         vlc_object_destroy( p_root );
 204     }
 205
 206 #if defined( PTH_INIT_IN_PTH_H )
 207     if( i_initializations == 0 )
 208     {
 209         return ( pth_kill() == FALSE );
 210     }
 211
 212 #elif defined( ST_INIT_IN_ST_H )
 213 #elif defined( UNDER_CE )
 214 #elif defined( WIN32 )
 215 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 216 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 217     pthread_mutex_unlock( &once_mutex );
 218 #elif defined( HAVE_CTHREADS_H )
 219 #endif
 220     return VLC_SUCCESS;
 221 }
 222
 223 /*****************************************************************************
 224  * vlc_mutex_init: initialize a mutex
 225  *****************************************************************************/
 226 int __vlc_mutex_init( vlc_object_t *p_this, vlc_mutex_t *p_mutex )
 227 {
 228     p_mutex->p_this = p_this;
 229
 230 #if defined( PTH_INIT_IN_PTH_H )
 231     return ( pth_mutex_init( &p_mutex->mutex ) == FALSE );
 232
 233 #elif defined( ST_INIT_IN_ST_H )
 234     p_mutex->mutex = st_mutex_new();
 235     return ( p_mutex->mutex == NULL ) ? errno : 0;
 236
 237 #elif defined( UNDER_CE )
 238     InitializeCriticalSection( &p_mutex->csection );
 239     return 0;
 240
 241 #elif defined( WIN32 )
 242     /* We use mutexes on WinNT/2K/XP because we can use the SignalObjectAndWait
 243      * function and have a 100% correct vlc_cond_wait() implementation.
 244      * As this function is not available on Win9x, we can use the faster
 245      * CriticalSections */
 246     if( p_this->p_libvlc->SignalObjectAndWait &&
 247         !p_this->p_libvlc->b_fast_mutex )
 248     {
 249         /* We are running on NT/2K/XP, we can use SignalObjectAndWait */
 250         p_mutex->mutex = CreateMutex( 0, FALSE, 0 );
 251         return ( p_mutex->mutex != NULL ? 0 : 1 );
 252     }
 253     else
 254     {
 255         p_mutex->mutex = NULL;
 256         InitializeCriticalSection( &p_mutex->csection );
 257         return 0;
 258     }
 259
 260 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 261     /* check the arguments and whether it's already been initialized */
 262     if( p_mutex == NULL )
 263     {
 264         return B_BAD_VALUE;
 265     }
 266
 267     if( p_mutex->init == 9999 )
 268     {
 269         return EALREADY;
 270     }
 271
 272     p_mutex->lock = create_sem( 1, "BeMutex" );
 273     if( p_mutex->lock < B_NO_ERROR )
 274     {
 275         return( -1 );
 276     }
 277
 278     p_mutex->init = 9999;
 279     return B_OK;
 280
 281 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 282 #   if defined(DEBUG) && defined(SYS_LINUX)
 283     {
 284         /* Create error-checking mutex to detect problems more easily. */
 285         pthread_mutexattr_t attr;
 286         int                 i_result;
 287
 288         pthread_mutexattr_init( &attr );
 289         pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_ERRORCHECK_NP );
 290         i_result = pthread_mutex_init( &p_mutex->mutex, &attr );
 291         pthread_mutexattr_destroy( &attr );
 292         return( i_result );
 293     }
 294 #   endif
 295     return pthread_mutex_init( &p_mutex->mutex, NULL );
 296
 297 #elif defined( HAVE_CTHREADS_H )
 298     mutex_init( p_mutex );
 299     return 0;
 300
 301 #endif
 302 }
 303
 304 /*****************************************************************************
 305  * vlc_mutex_destroy: destroy a mutex, inner version
 306  *****************************************************************************/
 307 int __vlc_mutex_destroy( char * psz_file, int i_line, vlc_mutex_t *p_mutex )
 308 {
 309     int i_result;
 310     /* In case of error : */
 311     int i_thread = -1;
 312     const char * psz_error = "";
 313
 314 #if defined( PTH_INIT_IN_PTH_H )
 315     return 0;
 316
 317 #elif defined( ST_INIT_IN_ST_H )
 318     i_result = st_mutex_destroy( p_mutex->mutex );
 319
 320 #elif defined( UNDER_CE )
 321     DeleteCriticalSection( &p_mutex->csection );
 322     return 0;
 323
 324 #elif defined( WIN32 )
 325     if( p_mutex->mutex )
 326     {
 327         CloseHandle( p_mutex->mutex );
 328     }
 329     else
 330     {
 331         DeleteCriticalSection( &p_mutex->csection );
 332     }
 333     return 0;
 334
 335 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 336     if( p_mutex->init == 9999 )
 337     {
 338         delete_sem( p_mutex->lock );
 339     }
 340
 341     p_mutex->init = 0;
 342     return B_OK;
 343
 344 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 345     i_result = pthread_mutex_destroy( &p_mutex->mutex );
 346     if ( i_result )
 347     {
 348         i_thread = (int)pthread_self();
 349         psz_error = strerror(i_result);
 350     }
 351
 352 #elif defined( HAVE_CTHREADS_H )
 353     return 0;
 354
 355 #endif
 356
 357     if( i_result )
 358     {
 359         msg_Err( p_mutex->p_this,
 360                  "thread %d: mutex_destroy failed at %s:%d (%d:%s)",
 361                  i_thread, psz_file, i_line, i_result, psz_error );
 362     }
 363     return i_result;
 364 }
 365
 366 /*****************************************************************************
 367  * vlc_cond_init: initialize a condition
 368  *****************************************************************************/
 369 int __vlc_cond_init( vlc_object_t *p_this, vlc_cond_t *p_condvar )
 370 {
 371     p_condvar->p_this = p_this;
 372
 373 #if defined( PTH_INIT_IN_PTH_H )
 374     return ( pth_cond_init( &p_condvar->cond ) == FALSE );
 375
 376 #elif defined( ST_INIT_IN_ST_H )
 377     p_condvar->cond = st_cond_new();
 378     return ( p_condvar->cond == NULL ) ? errno : 0;
 379
 380 #elif defined( UNDER_CE )
 381     /* Initialize counter */
 382     p_condvar->i_waiting_threads = 0;
 383
 384     /* Create an auto-reset event. */
 385     p_condvar->event = CreateEvent( NULL,   /* no security */
 386                                     FALSE,  /* auto-reset event */
 387                                     FALSE,  /* start non-signaled */
 388                                     NULL ); /* unnamed */
 389     return !p_condvar->event;
 390
 391 #elif defined( WIN32 )
 392     /* Initialize counter */
 393     p_condvar->i_waiting_threads = 0;
 394
 395     /* Misc init */
 396     p_condvar->i_win9x_cv = p_this->p_libvlc->i_win9x_cv;
 397     p_condvar->SignalObjectAndWait = p_this->p_libvlc->SignalObjectAndWait;
 398
 399     if( (p_condvar->SignalObjectAndWait && !p_this->p_libvlc->b_fast_mutex)
 400         || p_condvar->i_win9x_cv == 0 )
 401     {
 402         /* Create an auto-reset event. */
 403         p_condvar->event = CreateEvent( NULL,   /* no security */
 404                                         FALSE,  /* auto-reset event */
 405                                         FALSE,  /* start non-signaled */
 406                                         NULL ); /* unnamed */
 407
 408         p_condvar->semaphore = NULL;
 409         return !p_condvar->event;
 410     }
 411     else
 412     {
 413         p_condvar->semaphore = CreateSemaphore( NULL,       /* no security */
 414                                                 0,          /* initial count */
 415                                                 0x7fffffff, /* max count */
 416                                                 NULL );     /* unnamed */
 417
 418         if( p_condvar->i_win9x_cv == 1 )
 419             /* Create a manual-reset event initially signaled. */
 420             p_condvar->event = CreateEvent( NULL, TRUE, TRUE, NULL );
 421         else
 422             /* Create a auto-reset event. */
 423             p_condvar->event = CreateEvent( NULL, FALSE, FALSE, NULL );
 424
 425         InitializeCriticalSection( &p_condvar->csection );
 426
 427         return !p_condvar->semaphore || !p_condvar->event;
 428     }
 429
 430 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 431     if( !p_condvar )
 432     {
 433         return B_BAD_VALUE;
 434     }
 435
 436     if( p_condvar->init == 9999 )
 437     {
 438         return EALREADY;
 439     }
 440
 441     p_condvar->thread = -1;
 442     p_condvar->init = 9999;
 443     return 0;
 444
 445 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 446     return pthread_cond_init( &p_condvar->cond, NULL );
 447
 448 #elif defined( HAVE_CTHREADS_H )
 449     /* condition_init() */
 450     spin_lock_init( &p_condvar->lock );
 451     cthread_queue_init( &p_condvar->queue );
 452     p_condvar->name = 0;
 453     p_condvar->implications = 0;
 454
 455     return 0;
 456
 457 #endif
 458 }
 459
 460 /*****************************************************************************
 461  * vlc_cond_destroy: destroy a condition, inner version
 462  *****************************************************************************/
 463 int __vlc_cond_destroy( char * psz_file, int i_line, vlc_cond_t *p_condvar )
 464 {
 465     int i_result;
 466     /* In case of error : */
 467     int i_thread = -1;
 468     const char * psz_error = "";
 469
 470 #if defined( PTH_INIT_IN_PTH_H )
 471     return 0;
 472
 473 #elif defined( ST_INIT_IN_ST_H )
 474     i_result = st_cond_destroy( p_condvar->cond );
 475
 476 #elif defined( UNDER_CE )
 477     i_result = !CloseHandle( p_condvar->event );
 478
 479 #elif defined( WIN32 )
 480     if( !p_condvar->semaphore )
 481         i_result = !CloseHandle( p_condvar->event );
 482     else
 483         i_result = !CloseHandle( p_condvar->event )
 484           || !CloseHandle( p_condvar->semaphore );
 485
 486     if( p_condvar->semaphore != NULL )
 487                 DeleteCriticalSection( &p_condvar->csection );
 488
 489 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 490     p_condvar->init = 0;
 491     return 0;
 492
 493 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 494     i_result = pthread_cond_destroy( &p_condvar->cond );
 495     if ( i_result )
 496     {
 497         i_thread = (int)pthread_self();
 498         psz_error = strerror(i_result);
 499     }
 500
 501 #elif defined( HAVE_CTHREADS_H )
 502     return 0;
 503
 504 #endif
 505
 506     if( i_result )
 507     {
 508         msg_Err( p_condvar->p_this,
 509                  "thread %d: cond_destroy failed at %s:%d (%d:%s)",
 510                  i_thread, psz_file, i_line, i_result, psz_error );
 511     }
 512     return i_result;
 513 }
 514
 515 /*****************************************************************************
 516  * vlc_thread_create: create a thread, inner version
 517  *****************************************************************************
 518  * Note that i_priority is only taken into account on platforms supporting
 519  * userland real-time priority threads.
 520  *****************************************************************************/
 521 int __vlc_thread_create( vlc_object_t *p_this, char * psz_file, int i_line,
 522                          char *psz_name, void * ( *func ) ( void * ),
 523                          int i_priority, vlc_bool_t b_wait )
 524 {
 525     int i_ret;
 526     void *p_data = (void *)p_this;
 527
 528     vlc_mutex_lock( &p_this->object_lock );
 529
 530 #if defined( PTH_INIT_IN_PTH_H )
 531     p_this->thread_id = pth_spawn( PTH_ATTR_DEFAULT, func, p_data );
 532     i_ret = p_this->thread_id == NULL;
 533
 534 #elif defined( ST_INIT_IN_ST_H )
 535     p_this->thread_id = st_thread_create( func, p_data, 1, 0 );
 536     i_ret = 0;
 537
 538 #elif defined( WIN32 ) || defined( UNDER_CE )
 539     {
 540         unsigned threadID;
 541         /* When using the MSVCRT C library you have to use the _beginthreadex
 542          * function instead of CreateThread, otherwise you'll end up with
 543          * memory leaks and the signal functions not working (see Microsoft
 544          * Knowledge Base, article 104641) */
 545         p_this->thread_id =
 546 #if defined( UNDER_CE )
 547                 (HANDLE)CreateThread( NULL, 0, (PTHREAD_START) func,
 548                                       p_data, 0, &threadID );
 549 #else
 550                 (HANDLE)_beginthreadex( NULL, 0, (PTHREAD_START) func,
 551                                         p_data, 0, &threadID );
 552 #endif
 553     }
 554
 555     if ( p_this->thread_id && i_priority )
 556     {
 557         if ( !SetThreadPriority(p_this->thread_id, i_priority) )
 558         {
 559             msg_Warn( p_this, "couldn't set a faster priority" );
 560             i_priority = 0;
 561         }
 562     }
 563
 564     i_ret = ( p_this->thread_id ? 0 : 1 );
 565
 566 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 567     p_this->thread_id = spawn_thread( (thread_func)func, psz_name,
 568                                       i_priority, p_data );
 569     i_ret = resume_thread( p_this->thread_id );
 570
 571 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 572     i_ret = pthread_create( &p_this->thread_id, NULL, func, p_data );
 573
 574 #ifndef SYS_DARWIN
 575     if ( config_GetInt( p_this, "rt-priority" ) )
 576 #endif
 577     {
 578         int i_error, i_policy;
 579         struct sched_param param;
 580
 581         memset( &param, 0, sizeof(struct sched_param) );
 582         i_priority += config_GetInt( p_this, "rt-offset" );
 583         if ( i_priority <= 0 )
 584         {
 585             param.sched_priority = (-1) * i_priority;
 586             i_policy = SCHED_OTHER;
 587         }
 588         else
 589         {
 590             param.sched_priority = i_priority;
 591             i_policy = SCHED_RR;
 592         }
 593         if ( (i_error = pthread_setschedparam( p_this->thread_id,
 594                                                i_policy, &param )) )
 595         {
 596             msg_Warn( p_this, "couldn't set thread priority (%s:%d): %s",
 597                       psz_file, i_line, strerror(i_error) );
 598             i_priority = 0;
 599         }
 600     }
 601 #ifndef SYS_DARWIN
 602     else
 603     {
 604         i_priority = 0;
 605     }
 606 #endif
 607
 608 #elif defined( HAVE_CTHREADS_H )
 609     p_this->thread_id = cthread_fork( (cthread_fn_t)func, (any_t)p_data );
 610     i_ret = 0;
 611
 612 #endif
 613
 614     if( i_ret == 0 )
 615     {
 616         if( b_wait )
 617         {
 618             msg_Dbg( p_this, "waiting for thread completion" );
 619             vlc_cond_wait( &p_this->object_wait, &p_this->object_lock );
 620         }
 621
 622         p_this->b_thread = 1;
 623
 624         msg_Dbg( p_this, "thread %u (%s) created at priority %d (%s:%d)",
 625                  (unsigned int)p_this->thread_id, psz_name, i_priority,
 626                  psz_file, i_line );
 627
 628         vlc_mutex_unlock( &p_this->object_lock );
 629     }
 630     else
 631     {
 632 #ifdef HAVE_STRERROR
 633         msg_Err( p_this, "%s thread could not be created at %s:%d (%s)",
 634                          psz_name, psz_file, i_line, strerror(i_ret) );
 635 #else
 636         msg_Err( p_this, "%s thread could not be created at %s:%d",
 637                          psz_name, psz_file, i_line );
 638 #endif
 639         vlc_mutex_unlock( &p_this->object_lock );
 640     }
 641
 642     return i_ret;
 643 }
 644
 645 /*****************************************************************************
 646  * vlc_thread_set_priority: set the priority of the current thread when we
 647  * couldn't set it in vlc_thread_create (for instance for the main thread)
 648  *****************************************************************************/
 649 int __vlc_thread_set_priority( vlc_object_t *p_this, char * psz_file,
 650                                int i_line, int i_priority )
 651 {
 652 #if defined( PTH_INIT_IN_PTH_H ) || defined( ST_INIT_IN_ST_H )
 653 #elif defined( WIN32 ) || defined( UNDER_CE )
 654     if ( !SetThreadPriority(GetCurrentThread(), i_priority) )
 655     {
 656         msg_Warn( p_this, "couldn't set a faster priority" );
 657         return 1;
 658     }
 659
 660 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 661 #ifndef SYS_DARWIN
 662     if ( config_GetInt( p_this, "rt-priority" ) )
 663 #endif
 664     {
 665         int i_error, i_policy;
 666         struct sched_param param;
 667
 668         memset( &param, 0, sizeof(struct sched_param) );
 669         i_priority += config_GetInt( p_this, "rt-offset" );
 670         if ( i_priority <= 0 )
 671         {
 672             param.sched_priority = (-1) * i_priority;
 673             i_policy = SCHED_OTHER;
 674         }
 675         else
 676         {
 677             param.sched_priority = i_priority;
 678             i_policy = SCHED_RR;
 679         }
 680         if ( !p_this->thread_id )
 681             p_this->thread_id = pthread_self();
 682         if ( (i_error = pthread_setschedparam( p_this->thread_id,
 683                                                i_policy, &param )) )
 684         {
 685             msg_Warn( p_this, "couldn't set thread priority (%s:%d): %s",
 686                       psz_file, i_line, strerror(i_error) );
 687             i_priority = 0;
 688         }
 689     }
 690 #endif
 691
 692     return 0;
 693 }
 694
 695 /*****************************************************************************
 696  * vlc_thread_ready: tell the parent thread we were successfully spawned
 697  *****************************************************************************/
 698 void __vlc_thread_ready( vlc_object_t *p_this )
 699 {
 700     vlc_mutex_lock( &p_this->object_lock );
 701     vlc_cond_signal( &p_this->object_wait );
 702     vlc_mutex_unlock( &p_this->object_lock );
 703 }
 704
 705 /*****************************************************************************
 706  * vlc_thread_join: wait until a thread exits, inner version
 707  *****************************************************************************/
 708 void __vlc_thread_join( vlc_object_t *p_this, char * psz_file, int i_line )
 709 {
 710     int i_ret = 0;
 711
 712 #if defined( PTH_INIT_IN_PTH_H )
 713     i_ret = ( pth_join( p_this->thread_id, NULL ) == FALSE );
 714
 715 #elif defined( ST_INIT_IN_ST_H )
 716     i_ret = st_thread_join( p_this->thread_id, NULL );
 717
 718 #elif defined( UNDER_CE ) || defined( WIN32 )
 719     HMODULE hmodule;
 720     BOOL (WINAPI *OurGetThreadTimes)( HANDLE, FILETIME*, FILETIME*,
 721                                       FILETIME*, FILETIME* );
 722     FILETIME create_ft, exit_ft, kernel_ft, user_ft;
 723     int64_t real_time, kernel_time, user_time;
 724
 725     WaitForSingleObject( p_this->thread_id, INFINITE );
 726
 727 #if defined( UNDER_CE )
 728     hmodule = GetModuleHandle( _T("COREDLL") );
 729 #else
 730     hmodule = GetModuleHandle( _T("KERNEL32") );
 731 #endif
 732     OurGetThreadTimes = (BOOL (WINAPI*)( HANDLE, FILETIME*, FILETIME*,
 733                                          FILETIME*, FILETIME* ))
 734         GetProcAddress( hmodule, _T("GetThreadTimes") );
 735
 736     if( OurGetThreadTimes &&
 737         OurGetThreadTimes( p_this->thread_id,
 738                            &create_ft, &exit_ft, &kernel_ft, &user_ft ) )
 739     {
 740         real_time =
 741           ((((int64_t)exit_ft.dwHighDateTime)<<32)| exit_ft.dwLowDateTime) -
 742           ((((int64_t)create_ft.dwHighDateTime)<<32)| create_ft.dwLowDateTime);
 743         real_time /= 10;
 744
 745         kernel_time =
 746           ((((int64_t)kernel_ft.dwHighDateTime)<<32)|
 747            kernel_ft.dwLowDateTime) / 10;
 748
 749         user_time =
 750           ((((int64_t)user_ft.dwHighDateTime)<<32)|
 751            user_ft.dwLowDateTime) / 10;
 752
 753         msg_Dbg( p_this, "thread times: "
 754                  "real "I64Fd"m%fs, kernel "I64Fd"m%fs, user "I64Fd"m%fs",
 755                  real_time/60/1000000,
 756                  (double)((real_time%(60*1000000))/1000000.0),
 757                  kernel_time/60/1000000,
 758                  (double)((kernel_time%(60*1000000))/1000000.0),
 759                  user_time/60/1000000,
 760                  (double)((user_time%(60*1000000))/1000000.0) );
 761     }
 762     CloseHandle( p_this->thread_id );
 763
 764 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 765     int32_t exit_value;
 766     wait_for_thread( p_this->thread_id, &exit_value );
 767
 768 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 769     i_ret = pthread_join( p_this->thread_id, NULL );
 770
 771 #elif defined( HAVE_CTHREADS_H )
 772     cthread_join( p_this->thread_id );
 773     i_ret = 1;
 774
 775 #endif
 776
 777     if( i_ret )
 778     {
 779 #ifdef HAVE_STRERROR
 780         msg_Err( p_this, "thread_join(%u) failed at %s:%d (%s)",
 781                          (unsigned int)p_this->thread_id, psz_file, i_line,
 782                          strerror(i_ret) );
 783 #else
 784         msg_Err( p_this, "thread_join(%u) failed at %s:%d",
 785                          (unsigned int)p_this->thread_id, psz_file, i_line );
 786 #endif
 787     }
 788     else
 789     {
 790         msg_Dbg( p_this, "thread %u joined (%s:%d)",
 791                          (unsigned int)p_this->thread_id, psz_file, i_line );
 792     }
 793
 794     p_this->b_thread = 0;
 795 }
 796