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 1.19 2002/10/03 17:01:58 gbazin 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_condvar->SignalObjectAndWait && !p_this->p_vlc->b_fast_mutex)
 385         || p_condvar->i_win9x_cv == 0 )
 386     {
 387         /* Create an auto-reset event. */
 388         p_condvar->event = CreateEvent( NULL,   /* no security */
 389                                         FALSE,  /* auto-reset event */
 390                                         FALSE,  /* start non-signaled */
 391                                         NULL ); /* unnamed */
 392
 393         p_condvar->semaphore = NULL;
 394         return !p_condvar->event;
 395     }
 396     else
 397     {
 398         p_condvar->semaphore = CreateSemaphore( NULL,       /* no security */
 399                                                 0,          /* initial count */
 400                                                 0x7fffffff, /* max count */
 401                                                 NULL );     /* unnamed */
 402
 403         if( p_this->p_vlc->i_win9x_cv == 1 )
 404             /* Create a manual-reset event initially signaled. */
 405             p_condvar->event = CreateEvent( NULL, TRUE, TRUE, NULL );
 406         else
 407             /* Create a auto-reset event. */
 408             p_condvar->event = CreateEvent( NULL, FALSE, FALSE, NULL );
 409
 410         InitializeCriticalSection( &p_condvar->csection );
 411
 412         return !p_condvar->semaphore || !p_condvar->event;
 413     }
 414
 415 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 416     return pthread_cond_init( &p_condvar->cond, NULL );
 417
 418 #elif defined( HAVE_CTHREADS_H )
 419     /* condition_init() */
 420     spin_lock_init( &p_condvar->lock );
 421     cthread_queue_init( &p_condvar->queue );
 422     p_condvar->name = 0;
 423     p_condvar->implications = 0;
 424
 425     return 0;
 426
 427 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 428     if( !p_condvar )
 429     {
 430         return B_BAD_VALUE;
 431     }
 432
 433     if( p_condvar->init == 9999 )
 434     {
 435         return EALREADY;
 436     }
 437
 438     p_condvar->thread = -1;
 439     p_condvar->init = 9999;
 440     return 0;
 441 #endif
 442 }
 443
 444 /*****************************************************************************
 445  * vlc_cond_destroy: destroy a condition, inner version
 446  *****************************************************************************/
 447 int __vlc_cond_destroy( char * psz_file, int i_line, vlc_cond_t *p_condvar )
 448 {
 449     int i_result;
 450     /* In case of error : */
 451     int i_thread = -1;
 452     const char * psz_error = "";
 453
 454 #if defined( PTH_INIT_IN_PTH_H )
 455     return 0;
 456
 457 #elif defined( ST_INIT_IN_ST_H )
 458     i_result = st_cond_destroy( p_condvar->cond );
 459
 460 #elif defined( WIN32 )
 461     if( !p_condvar->semaphore )
 462         i_result = !CloseHandle( p_condvar->event );
 463     else
 464         i_result = !CloseHandle( p_condvar->event )
 465           || !CloseHandle( p_condvar->semaphore );
 466
 467 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 468     i_result = pthread_cond_destroy( &p_condvar->cond );
 469     if ( i_result )
 470     {
 471         i_thread = (int)pthread_self();
 472         psz_error = strerror(i_result);
 473     }
 474
 475 #elif defined( HAVE_CTHREADS_H )
 476     return 0;
 477
 478 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 479     p_condvar->init = 0;
 480     return 0;
 481 #endif
 482
 483     if( i_result )
 484     {
 485         msg_Err( p_condvar->p_this,
 486                  "thread %d: cond_destroy failed at %s:%d (%d:%s)",
 487                  i_thread, psz_file, i_line, i_result, psz_error );
 488     }
 489     return i_result;
 490 }
 491
 492 /*****************************************************************************
 493  * vlc_thread_create: create a thread, inner version
 494  *****************************************************************************
 495  * Note that i_priority is only taken into account on platforms supporting
 496  * userland real-time priority threads.
 497  *****************************************************************************/
 498 int __vlc_thread_create( vlc_object_t *p_this, char * psz_file, int i_line,
 499                          char *psz_name, void * ( *func ) ( void * ),
 500                          int i_priority, vlc_bool_t b_wait )
 501 {
 502     int i_ret;
 503
 504     vlc_mutex_lock( &p_this->object_lock );
 505
 506 #ifdef GPROF
 507     wrapper_t wrapper;
 508
 509     /* Initialize the wrapper structure */
 510     wrapper.func = func;
 511     wrapper.p_data = (void *)p_this;
 512     getitimer( ITIMER_PROF, &wrapper.itimer );
 513     vlc_mutex_init( p_this, &wrapper.lock );
 514     vlc_cond_init( p_this, &wrapper.wait );
 515     vlc_mutex_lock( &wrapper.lock );
 516
 517     /* Alter user-passed data so that we call the wrapper instead
 518      * of the real function */
 519     p_data = &wrapper;
 520     func = vlc_thread_wrapper;
 521 #endif
 522
 523 #if defined( PTH_INIT_IN_PTH_H )
 524     p_this->thread_id = pth_spawn( PTH_ATTR_DEFAULT, func, (void *)p_this );
 525     i_ret = 0;
 526
 527 #elif defined( ST_INIT_IN_ST_H )
 528     p_this->thread_id = st_thread_create( func, (void *)p_this, 1, 0 );
 529     i_ret = 0;
 530
 531 #elif defined( WIN32 )
 532     {
 533         unsigned threadID;
 534         /* When using the MSVCRT C library you have to use the _beginthreadex
 535          * function instead of CreateThread, otherwise you'll end up with
 536          * memory leaks and the signal functions not working */
 537         p_this->thread_id =
 538                 (HANDLE)_beginthreadex( NULL, 0, (PTHREAD_START) func,
 539                                         (void *)p_this, 0, &threadID );
 540     }
 541
 542     if ( p_this->thread_id && i_priority )
 543     {
 544         if ( !SetThreadPriority(p_this->thread_id, i_priority) )
 545         {
 546             msg_Warn( p_this, "couldn't set a faster priority" );
 547             i_priority = 0;
 548         }
 549     }
 550
 551     i_ret = ( p_this->thread_id ? 0 : 1 );
 552
 553 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 554     i_ret = pthread_create( &p_this->thread_id, NULL, func, (void *)p_this );
 555
 556     if ( i_priority )
 557     {
 558         struct sched_param param;
 559         memset( &param, 0, sizeof(struct sched_param) );
 560         param.sched_priority = i_priority;
 561         if ( pthread_setschedparam( p_this->thread_id, SCHED_RR, &param ) )
 562         {
 563             msg_Warn( p_this, "couldn't go to real-time priority" );
 564             i_priority = 0;
 565         }
 566     }
 567
 568 #elif defined( HAVE_CTHREADS_H )
 569     p_this->thread_id = cthread_fork( (cthread_fn_t)func, (any_t)p_this );
 570     i_ret = 0;
 571
 572 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 573     p_this->thread_id = spawn_thread( (thread_func)func, psz_name,
 574                                       B_NORMAL_PRIORITY, (void *)p_this );
 575     i_ret = resume_thread( p_this->thread_id );
 576
 577 #endif
 578
 579 #ifdef GPROF
 580     if( i_ret == 0 )
 581     {
 582         vlc_cond_wait( &wrapper.wait, &wrapper.lock );
 583     }
 584
 585     vlc_mutex_unlock( &wrapper.lock );
 586     vlc_mutex_destroy( &wrapper.lock );
 587     vlc_cond_destroy( &wrapper.wait );
 588 #endif
 589
 590     if( i_ret == 0 )
 591     {
 592         if( b_wait )
 593         {
 594             msg_Dbg( p_this, "waiting for thread completion" );
 595             vlc_cond_wait( &p_this->object_wait, &p_this->object_lock );
 596         }
 597
 598         p_this->b_thread = 1;
 599
 600         msg_Dbg( p_this, "thread %d (%s) created at priority %d (%s:%d)",
 601                  p_this->thread_id, psz_name, i_priority,
 602                  psz_file, i_line );
 603
 604         vlc_mutex_unlock( &p_this->object_lock );
 605     }
 606     else
 607     {
 608         msg_Err( p_this, "%s thread could not be created at %s:%d (%s)",
 609                          psz_name, psz_file, i_line, strerror(i_ret) );
 610         vlc_mutex_unlock( &p_this->object_lock );
 611     }
 612
 613     return i_ret;
 614 }
 615
 616 /*****************************************************************************
 617  * vlc_thread_ready: tell the parent thread we were successfully spawned
 618  *****************************************************************************/
 619 void __vlc_thread_ready( vlc_object_t *p_this )
 620 {
 621     vlc_mutex_lock( &p_this->object_lock );
 622     vlc_cond_signal( &p_this->object_wait );
 623     vlc_mutex_unlock( &p_this->object_lock );
 624 }
 625
 626 /*****************************************************************************
 627  * vlc_thread_join: wait until a thread exits, inner version
 628  *****************************************************************************/
 629 void __vlc_thread_join( vlc_object_t *p_this, char * psz_file, int i_line )
 630 {
 631     int i_ret = 0;
 632
 633 #if defined( PTH_INIT_IN_PTH_H )
 634     i_ret = pth_join( p_this->thread_id, NULL );
 635
 636 #elif defined( ST_INIT_IN_ST_H )
 637     i_ret = st_thread_join( p_this->thread_id, NULL );
 638
 639 #elif defined( WIN32 )
 640     WaitForSingleObject( p_this->thread_id, INFINITE );
 641
 642 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 643     i_ret = pthread_join( p_this->thread_id, NULL );
 644
 645 #elif defined( HAVE_CTHREADS_H )
 646     cthread_join( p_this->thread_id );
 647     i_ret = 1;
 648
 649 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 650     int32 exit_value;
 651     wait_for_thread( p_this->thread_id, &exit_value );
 652
 653 #endif
 654
 655     if( i_ret )
 656     {
 657         msg_Err( p_this, "thread_join(%d) failed at %s:%d (%s)",
 658                          p_this->thread_id, psz_file, i_line, strerror(i_ret) );
 659     }
 660     else
 661     {
 662         msg_Dbg( p_this, "thread %d joined (%s:%d)",
 663                          p_this->thread_id, psz_file, i_line );
 664     }
 665
 666     p_this->b_thread = 0;
 667 }
 668
 669 /*****************************************************************************
 670  * vlc_thread_wrapper: wrapper around thread functions used when profiling.
 671  *****************************************************************************/
 672 #ifdef GPROF
 673 static void *vlc_thread_wrapper( void *p_wrapper )
 674 {
 675     /* Put user data in thread-local variables */
 676     void *            p_data = ((wrapper_t*)p_wrapper)->p_data;
 677     vlc_thread_func_t func   = ((wrapper_t*)p_wrapper)->func;
 678
 679     /* Set the profile timer value */
 680     setitimer( ITIMER_PROF, &((wrapper_t*)p_wrapper)->itimer, NULL );
 681
 682     /* Tell the calling thread that we don't need its data anymore */
 683     vlc_mutex_lock( &((wrapper_t*)p_wrapper)->lock );
 684     vlc_cond_signal( &((wrapper_t*)p_wrapper)->wait );
 685     vlc_mutex_unlock( &((wrapper_t*)p_wrapper)->lock );
 686
 687     /* Call the real function */
 688     return func( p_data );
 689 }
 690 #endif