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 1.18 2002/10/03 13:21:55 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 #define VLC_THREADS_UNINITIALIZED  0
  29 #define VLC_THREADS_PENDING        1
  30 #define VLC_THREADS_ERROR          2
  31 #define VLC_THREADS_READY          3
  32
  33 /*****************************************************************************
  34  * Global mutex for lazy initialization of the threads system
  35  *****************************************************************************/
  36 static volatile int i_initializations = 0;
  37
  38 #if defined( PTH_INIT_IN_PTH_H )
  39 #elif defined( ST_INIT_IN_ST_H )
  40 #elif defined( WIN32 )
  41 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
  42     static pthread_mutex_t once_mutex = PTHREAD_MUTEX_INITIALIZER;
  43 #elif defined( HAVE_CTHREADS_H )
  44 #elif defined( HAVE_KERNEL_SCHEDULER_H )
  45 #endif
  46
  47 /*****************************************************************************
  48  * vlc_threads_init: initialize threads system
  49  *****************************************************************************
  50  * This function requires lazy initialization of a global lock in order to
  51  * keep the library really thread-safe. Some architectures don't support this
  52  * and thus do not guarantee the complete reentrancy.
  53  *****************************************************************************/
  54 int __vlc_threads_init( vlc_object_t *p_this )
  55 {
  56     static volatile int i_status = VLC_THREADS_UNINITIALIZED;
  57
  58     libvlc_t *p_libvlc = (libvlc_t *)p_this;
  59     int i_ret = VLC_SUCCESS;
  60
  61     /* If we have lazy mutex initialization, use it. Otherwise, we just
  62      * hope nothing wrong happens. */
  63 #if defined( PTH_INIT_IN_PTH_H )
  64 #elif defined( ST_INIT_IN_ST_H )
  65 #elif defined( WIN32 )
  66     HINSTANCE hInstLib;
  67 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
  68     pthread_mutex_lock( &once_mutex );
  69 #elif defined( HAVE_CTHREADS_H )
  70 #elif defined( HAVE_KERNEL_SCHEDULER_H )
  71 #endif
  72
  73     if( i_status == VLC_THREADS_UNINITIALIZED )
  74     {
  75         i_status = VLC_THREADS_PENDING;
  76
  77         /* We should be safe now. Do all the initialization stuff we want. */
  78         vlc_object_create( p_libvlc, VLC_OBJECT_ROOT );
  79         p_libvlc->b_ready = VLC_FALSE;
  80
  81 #if defined( PTH_INIT_IN_PTH_H )
  82         i_ret = pth_init();
  83
  84 #elif defined( ST_INIT_IN_ST_H )
  85         i_ret = st_init();
  86
  87 #elif defined( WIN32 )
  88         /* Dynamically get the address of SignalObjectAndWait */
  89         if( GetVersion() < 0x80000000 )
  90         {
  91             /* We are running on NT/2K/XP, we can use SignalObjectAndWait */
  92             hInstLib = LoadLibrary( "kernel32" );
  93             if( hInstLib )
  94             {
  95                 p_libvlc->SignalObjectAndWait =
  96                     (SIGNALOBJECTANDWAIT)GetProcAddress( hInstLib,
  97                                                      "SignalObjectAndWait" );
  98             }
  99         }
 100         else
 101         {
 102             p_libvlc->SignalObjectAndWait = NULL;
 103         }
 104
 105         p_libvlc->b_fast_mutex = 0;
 106         p_libvlc->i_win9x_cv = 0;
 107
 108 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 109 #elif defined( HAVE_CTHREADS_H )
 110 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 111 #endif
 112
 113         vlc_mutex_init( p_libvlc, &p_libvlc->global_lock );
 114
 115         if( i_ret )
 116         {
 117             i_status = VLC_THREADS_ERROR;
 118         }
 119         else
 120         {
 121             i_initializations++;
 122             i_status = VLC_THREADS_READY;
 123         }
 124     }
 125     else
 126     {
 127         /* Just increment the initialization count */
 128         i_initializations++;
 129     }
 130
 131     /* If we have lazy mutex initialization support, unlock the mutex;
 132      * otherwize, do a naive wait loop. */
 133 #if defined( PTH_INIT_IN_PTH_H )
 134     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 135 #elif defined( ST_INIT_IN_ST_H )
 136     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 137 #elif defined( WIN32 )
 138     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 139 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 140     pthread_mutex_unlock( &once_mutex );
 141 #elif defined( HAVE_CTHREADS_H )
 142     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 143 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 144     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 145 #endif
 146
 147     if( i_status != VLC_THREADS_READY )
 148     {
 149         return VLC_ETHREAD;
 150     }
 151
 152     return i_ret;
 153 }
 154
 155 /*****************************************************************************
 156  * vlc_threads_end: stop threads system
 157  *****************************************************************************
 158  * FIXME: This function is far from being threadsafe. We should undo exactly
 159  * what we did above in vlc_threads_init.
 160  *****************************************************************************/
 161 int __vlc_threads_end( vlc_object_t *p_this )
 162 {
 163 #if defined( PTH_INIT_IN_PTH_H )
 164     i_initializations--;
 165     if( i_initializations == 0 )
 166     {
 167         return pth_kill();
 168     }
 169
 170 #elif defined( ST_INIT_IN_ST_H )
 171     i_initializations--;
 172
 173 #elif defined( WIN32 )
 174     i_initializations--;
 175
 176 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 177     pthread_mutex_lock( &once_mutex );
 178     i_initializations--;
 179     pthread_mutex_unlock( &once_mutex );
 180
 181 #elif defined( HAVE_CTHREADS_H )
 182     i_initializations--;
 183
 184 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 185     i_initializations--;
 186
 187 #endif
 188     return VLC_SUCCESS;
 189 }
 190
 191 /*****************************************************************************
 192  * Prototype for GPROF wrapper
 193  *****************************************************************************/
 194 #ifdef GPROF
 195 /* Wrapper function for profiling */
 196 static void *      vlc_thread_wrapper ( void *p_wrapper );
 197
 198 #   ifdef WIN32
 199
 200 #       define ITIMER_REAL 1
 201 #       define ITIMER_PROF 2
 202
 203 struct itimerval
 204 {
 205     struct timeval it_value;
 206     struct timeval it_interval;
 207 };
 208
 209 int setitimer(int kind, const struct itimerval* itnew, struct itimerval* itold);
 210 #   endif /* WIN32 */
 211
 212 typedef struct wrapper_t
 213 {
 214     /* Data lock access */
 215     vlc_mutex_t lock;
 216     vlc_cond_t  wait;
 217
 218     /* Data used to spawn the real thread */
 219     vlc_thread_func_t func;
 220     void *p_data;
 221
 222     /* Profiling timer passed to the thread */
 223     struct itimerval itimer;
 224
 225 } wrapper_t;
 226
 227 #endif /* GPROF */
 228
 229 /*****************************************************************************
 230  * vlc_mutex_init: initialize a mutex
 231  *****************************************************************************/
 232 int __vlc_mutex_init( vlc_object_t *p_this, vlc_mutex_t *p_mutex )
 233 {
 234     p_mutex->p_this = p_this;
 235
 236 #if defined( PTH_INIT_IN_PTH_H )
 237     return pth_mutex_init( &p_mutex->mutex );
 238
 239 #elif defined( ST_INIT_IN_ST_H )
 240     p_mutex->mutex = st_mutex_new();
 241     return ( p_mutex->mutex == NULL ) ? errno : 0;
 242
 243 #elif defined( WIN32 )
 244     /* We use mutexes on WinNT/2K/XP because we can use the SignalObjectAndWait
 245      * function and have a 100% correct vlc_cond_wait() implementation.
 246      * As this function is not available on Win9x, we can use the faster
 247      * CriticalSections */
 248     if( p_this->p_vlc->SignalObjectAndWait && !p_this->p_vlc->b_fast_mutex )
 249     {
 250         /* We are running on NT/2K/XP, we can use SignalObjectAndWait */
 251         p_mutex->mutex = CreateMutex( 0, FALSE, 0 );
 252         return ( p_mutex->mutex != NULL ? 0 : 1 );
 253     }
 254     else
 255     {
 256         p_mutex->mutex = NULL;
 257         InitializeCriticalSection( &p_mutex->csection );
 258         return 0;
 259     }
 260
 261 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 262 #   if defined(DEBUG) && defined(SYS_LINUX)
 263     {
 264         /* Create error-checking mutex to detect problems more easily. */
 265         pthread_mutexattr_t attr;
 266         int                 i_result;
 267
 268         pthread_mutexattr_init( &attr );
 269         pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_ERRORCHECK_NP );
 270         i_result = pthread_mutex_init( &p_mutex->mutex, &attr );
 271         pthread_mutexattr_destroy( &attr );
 272         return( i_result );
 273     }
 274 #   endif
 275     return pthread_mutex_init( &p_mutex->mutex, NULL );
 276
 277 #elif defined( HAVE_CTHREADS_H )
 278     mutex_init( p_mutex );
 279     return 0;
 280
 281 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 282     /* check the arguments and whether it's already been initialized */
 283     if( p_mutex == NULL )
 284     {
 285         return B_BAD_VALUE;
 286     }
 287
 288     if( p_mutex->init == 9999 )
 289     {
 290         return EALREADY;
 291     }
 292
 293     p_mutex->lock = create_sem( 1, "BeMutex" );
 294     if( p_mutex->lock < B_NO_ERROR )
 295     {
 296         return( -1 );
 297     }
 298
 299     p_mutex->init = 9999;
 300     return B_OK;
 301
 302 #endif
 303 }
 304
 305 /*****************************************************************************
 306  * vlc_mutex_destroy: destroy a mutex, inner version
 307  *****************************************************************************/
 308 int __vlc_mutex_destroy( char * psz_file, int i_line, vlc_mutex_t *p_mutex )
 309 {
 310     int i_result;
 311     /* In case of error : */
 312     int i_thread = -1;
 313     const char * psz_error = "";
 314
 315 #if defined( PTH_INIT_IN_PTH_H )
 316     return 0;
 317
 318 #elif defined( ST_INIT_IN_ST_H )
 319     i_result = st_mutex_destroy( p_mutex->mutex );
 320
 321 #elif defined( WIN32 )
 322     if( p_mutex->mutex )
 323     {
 324         CloseHandle( p_mutex->mutex );
 325     }
 326     else
 327     {
 328         DeleteCriticalSection( &p_mutex->csection );
 329     }
 330     return 0;
 331
 332 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 333     i_result = pthread_mutex_destroy( &p_mutex->mutex );
 334     if ( i_result )
 335     {
 336         i_thread = (int)pthread_self();
 337         psz_error = strerror(i_result);
 338     }
 339
 340 #elif defined( HAVE_CTHREADS_H )
 341     return 0;
 342
 343 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 344     if( p_mutex->init == 9999 )
 345     {
 346         delete_sem( p_mutex->lock );
 347     }
 348
 349     p_mutex->init = 0;
 350     return B_OK;
 351 #endif
 352
 353     if( i_result )
 354     {
 355         msg_Err( p_mutex->p_this,
 356                  "thread %d: mutex_destroy failed at %s:%d (%d:%s)",
 357                  i_thread, psz_file, i_line, i_result, psz_error );
 358     }
 359     return i_result;
 360 }
 361
 362 /*****************************************************************************
 363  * vlc_cond_init: initialize a condition
 364  *****************************************************************************/
 365 int __vlc_cond_init( vlc_object_t *p_this, vlc_cond_t *p_condvar )
 366 {
 367     p_condvar->p_this = p_this;
 368
 369 #if defined( PTH_INIT_IN_PTH_H )
 370     return pth_cond_init( &p_condvar->cond );
 371
 372 #elif defined( ST_INIT_IN_ST_H )
 373     p_condvar->cond = st_cond_new();
 374     return ( p_condvar->cond == NULL ) ? errno : 0;
 375
 376 #elif defined( WIN32 )
 377     /* Initialize counter */
 378     p_condvar->i_waiting_threads = 0;
 379
 380     /* Misc init */
 381     p_condvar->i_win9x_cv = p_this->p_vlc->i_win9x_cv;
 382     p_condvar->SignalObjectAndWait = p_this->p_vlc->SignalObjectAndWait;
 383
 384     if( p_this->p_vlc->i_win9x_cv == 0 )
 385     {
 386         /* Create an auto-reset event. */
 387         p_condvar->event = CreateEvent( NULL,   /* no security */
 388                                         FALSE,  /* auto-reset event */
 389                                         FALSE,  /* start non-signaled */
 390                                         NULL ); /* unnamed */
 391
 392         p_condvar->semaphore = NULL;
 393         return !p_condvar->event;
 394     }
 395     else
 396     {
 397         p_condvar->semaphore = CreateSemaphore( NULL,       /* no security */
 398                                                 0,          /* initial count */
 399                                                 0x7fffffff, /* max count */
 400                                                 NULL );     /* unnamed */
 401
 402         if( p_this->p_vlc->i_win9x_cv == 1 )
 403             /* Create a manual-reset event initially signaled. */
 404             p_condvar->event = CreateEvent( NULL, TRUE, TRUE, NULL );
 405         else
 406             /* Create a auto-reset event. */
 407             p_condvar->event = CreateEvent( NULL, FALSE, FALSE, NULL );
 408
 409         InitializeCriticalSection( &p_condvar->csection );
 410
 411         return !p_condvar->semaphore || !p_condvar->event;
 412     }
 413
 414 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 415     return pthread_cond_init( &p_condvar->cond, NULL );
 416
 417 #elif defined( HAVE_CTHREADS_H )
 418     /* condition_init() */
 419     spin_lock_init( &p_condvar->lock );
 420     cthread_queue_init( &p_condvar->queue );
 421     p_condvar->name = 0;
 422     p_condvar->implications = 0;
 423
 424     return 0;
 425
 426 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 427     if( !p_condvar )
 428     {
 429         return B_BAD_VALUE;
 430     }
 431
 432     if( p_condvar->init == 9999 )
 433     {
 434         return EALREADY;
 435     }
 436
 437     p_condvar->thread = -1;
 438     p_condvar->init = 9999;
 439     return 0;
 440 #endif
 441 }
 442
 443 /*****************************************************************************
 444  * vlc_cond_destroy: destroy a condition, inner version
 445  *****************************************************************************/
 446 int __vlc_cond_destroy( char * psz_file, int i_line, vlc_cond_t *p_condvar )
 447 {
 448     int i_result;
 449     /* In case of error : */
 450     int i_thread = -1;
 451     const char * psz_error = "";
 452
 453 #if defined( PTH_INIT_IN_PTH_H )
 454     return 0;
 455
 456 #elif defined( ST_INIT_IN_ST_H )
 457     i_result = st_cond_destroy( p_condvar->cond );
 458
 459 #elif defined( WIN32 )
 460     if( !p_condvar->semaphore )
 461         i_result = !CloseHandle( p_condvar->event );
 462     else
 463         i_result = !CloseHandle( p_condvar->event )
 464           || !CloseHandle( p_condvar->semaphore );
 465
 466 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 467     i_result = pthread_cond_destroy( &p_condvar->cond );
 468     if ( i_result )
 469     {
 470         i_thread = (int)pthread_self();
 471         psz_error = strerror(i_result);
 472     }
 473
 474 #elif defined( HAVE_CTHREADS_H )
 475     return 0;
 476
 477 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 478     p_condvar->init = 0;
 479     return 0;
 480 #endif
 481
 482     if( i_result )
 483     {
 484         msg_Err( p_condvar->p_this,
 485                  "thread %d: cond_destroy failed at %s:%d (%d:%s)",
 486                  i_thread, psz_file, i_line, i_result, psz_error );
 487     }
 488     return i_result;
 489 }
 490
 491 /*****************************************************************************
 492  * vlc_thread_create: create a thread, inner version
 493  *****************************************************************************
 494  * Note that i_priority is only taken into account on platforms supporting
 495  * userland real-time priority threads.
 496  *****************************************************************************/
 497 int __vlc_thread_create( vlc_object_t *p_this, char * psz_file, int i_line,
 498                          char *psz_name, void * ( *func ) ( void * ),
 499                          int i_priority, vlc_bool_t b_wait )
 500 {
 501     int i_ret;
 502
 503     vlc_mutex_lock( &p_this->object_lock );
 504
 505 #ifdef GPROF
 506     wrapper_t wrapper;
 507
 508     /* Initialize the wrapper structure */
 509     wrapper.func = func;
 510     wrapper.p_data = (void *)p_this;
 511     getitimer( ITIMER_PROF, &wrapper.itimer );
 512     vlc_mutex_init( p_this, &wrapper.lock );
 513     vlc_cond_init( p_this, &wrapper.wait );
 514     vlc_mutex_lock( &wrapper.lock );
 515
 516     /* Alter user-passed data so that we call the wrapper instead
 517      * of the real function */
 518     p_data = &wrapper;
 519     func = vlc_thread_wrapper;
 520 #endif
 521
 522 #if defined( PTH_INIT_IN_PTH_H )
 523     p_this->thread_id = pth_spawn( PTH_ATTR_DEFAULT, func, (void *)p_this );
 524     i_ret = 0;
 525
 526 #elif defined( ST_INIT_IN_ST_H )
 527     p_this->thread_id = st_thread_create( func, (void *)p_this, 1, 0 );
 528     i_ret = 0;
 529
 530 #elif defined( WIN32 )
 531     {
 532         unsigned threadID;
 533         /* When using the MSVCRT C library you have to use the _beginthreadex
 534          * function instead of CreateThread, otherwise you'll end up with
 535          * memory leaks and the signal functions not working */
 536         p_this->thread_id =
 537                 (HANDLE)_beginthreadex( NULL, 0, (PTHREAD_START) func,
 538                                         (void *)p_this, 0, &threadID );
 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, (void *)p_this );
 554
 555     if ( i_priority )
 556     {
 557         struct sched_param param;
 558         memset( &param, 0, sizeof(struct sched_param) );
 559         param.sched_priority = i_priority;
 560         if ( pthread_setschedparam( p_this->thread_id, SCHED_RR, &param ) )
 561         {
 562             msg_Warn( p_this, "couldn't go to real-time priority" );
 563             i_priority = 0;
 564         }
 565     }
 566
 567 #elif defined( HAVE_CTHREADS_H )
 568     p_this->thread_id = cthread_fork( (cthread_fn_t)func, (any_t)p_this );
 569     i_ret = 0;
 570
 571 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 572     p_this->thread_id = spawn_thread( (thread_func)func, psz_name,
 573                                       B_NORMAL_PRIORITY, (void *)p_this );
 574     i_ret = resume_thread( p_this->thread_id );
 575
 576 #endif
 577
 578 #ifdef GPROF
 579     if( i_ret == 0 )
 580     {
 581         vlc_cond_wait( &wrapper.wait, &wrapper.lock );
 582     }
 583
 584     vlc_mutex_unlock( &wrapper.lock );
 585     vlc_mutex_destroy( &wrapper.lock );
 586     vlc_cond_destroy( &wrapper.wait );
 587 #endif
 588
 589     if( i_ret == 0 )
 590     {
 591         if( b_wait )
 592         {
 593             msg_Dbg( p_this, "waiting for thread completion" );
 594             vlc_cond_wait( &p_this->object_wait, &p_this->object_lock );
 595         }
 596
 597         p_this->b_thread = 1;
 598
 599         msg_Dbg( p_this, "thread %d (%s) created at priority %d (%s:%d)",
 600                  p_this->thread_id, psz_name, i_priority,
 601                  psz_file, i_line );
 602
 603         vlc_mutex_unlock( &p_this->object_lock );
 604     }
 605     else
 606     {
 607         msg_Err( p_this, "%s thread could not be created at %s:%d (%s)",
 608                          psz_name, psz_file, i_line, strerror(i_ret) );
 609         vlc_mutex_unlock( &p_this->object_lock );
 610     }
 611
 612     return i_ret;
 613 }
 614
 615 /*****************************************************************************
 616  * vlc_thread_ready: tell the parent thread we were successfully spawned
 617  *****************************************************************************/
 618 void __vlc_thread_ready( vlc_object_t *p_this )
 619 {
 620     vlc_mutex_lock( &p_this->object_lock );
 621     vlc_cond_signal( &p_this->object_wait );
 622     vlc_mutex_unlock( &p_this->object_lock );
 623 }
 624
 625 /*****************************************************************************
 626  * vlc_thread_join: wait until a thread exits, inner version
 627  *****************************************************************************/
 628 void __vlc_thread_join( vlc_object_t *p_this, char * psz_file, int i_line )
 629 {
 630     int i_ret = 0;
 631
 632 #if defined( PTH_INIT_IN_PTH_H )
 633     i_ret = pth_join( p_this->thread_id, NULL );
 634
 635 #elif defined( ST_INIT_IN_ST_H )
 636     i_ret = st_thread_join( p_this->thread_id, NULL );
 637
 638 #elif defined( WIN32 )
 639     WaitForSingleObject( p_this->thread_id, INFINITE );
 640
 641 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 642     i_ret = pthread_join( p_this->thread_id, NULL );
 643
 644 #elif defined( HAVE_CTHREADS_H )
 645     cthread_join( p_this->thread_id );
 646     i_ret = 1;
 647
 648 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 649     int32 exit_value;
 650     wait_for_thread( p_this->thread_id, &exit_value );
 651
 652 #endif
 653
 654     if( i_ret )
 655     {
 656         msg_Err( p_this, "thread_join(%d) failed at %s:%d (%s)",
 657                          p_this->thread_id, psz_file, i_line, strerror(i_ret) );
 658     }
 659     else
 660     {
 661         msg_Dbg( p_this, "thread %d joined (%s:%d)",
 662                          p_this->thread_id, psz_file, i_line );
 663     }
 664
 665     p_this->b_thread = 0;
 666 }
 667
 668 /*****************************************************************************
 669  * vlc_thread_wrapper: wrapper around thread functions used when profiling.
 670  *****************************************************************************/
 671 #ifdef GPROF
 672 static void *vlc_thread_wrapper( void *p_wrapper )
 673 {
 674     /* Put user data in thread-local variables */
 675     void *            p_data = ((wrapper_t*)p_wrapper)->p_data;
 676     vlc_thread_func_t func   = ((wrapper_t*)p_wrapper)->func;
 677
 678     /* Set the profile timer value */
 679     setitimer( ITIMER_PROF, &((wrapper_t*)p_wrapper)->itimer, NULL );
 680
 681     /* Tell the calling thread that we don't need its data anymore */
 682     vlc_mutex_lock( &((wrapper_t*)p_wrapper)->lock );
 683     vlc_cond_signal( &((wrapper_t*)p_wrapper)->wait );
 684     vlc_mutex_unlock( &((wrapper_t*)p_wrapper)->lock );
 685
 686     /* Call the real function */
 687     return func( p_data );
 688 }
 689 #endif