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 1.20 2002/10/04 12:01:40 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_libvlc->SignalObjectAndWait &&
 249         !p_this->p_libvlc->b_fast_mutex )
 250     {
 251         /* We are running on NT/2K/XP, we can use SignalObjectAndWait */
 252         p_mutex->mutex = CreateMutex( 0, FALSE, 0 );
 253         return ( p_mutex->mutex != NULL ? 0 : 1 );
 254     }
 255     else
 256     {
 257         p_mutex->mutex = NULL;
 258         InitializeCriticalSection( &p_mutex->csection );
 259         return 0;
 260     }
 261
 262 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 263 #   if defined(DEBUG) && defined(SYS_LINUX)
 264     {
 265         /* Create error-checking mutex to detect problems more easily. */
 266         pthread_mutexattr_t attr;
 267         int                 i_result;
 268
 269         pthread_mutexattr_init( &attr );
 270         pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_ERRORCHECK_NP );
 271         i_result = pthread_mutex_init( &p_mutex->mutex, &attr );
 272         pthread_mutexattr_destroy( &attr );
 273         return( i_result );
 274     }
 275 #   endif
 276     return pthread_mutex_init( &p_mutex->mutex, NULL );
 277
 278 #elif defined( HAVE_CTHREADS_H )
 279     mutex_init( p_mutex );
 280     return 0;
 281
 282 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 283     /* check the arguments and whether it's already been initialized */
 284     if( p_mutex == NULL )
 285     {
 286         return B_BAD_VALUE;
 287     }
 288
 289     if( p_mutex->init == 9999 )
 290     {
 291         return EALREADY;
 292     }
 293
 294     p_mutex->lock = create_sem( 1, "BeMutex" );
 295     if( p_mutex->lock < B_NO_ERROR )
 296     {
 297         return( -1 );
 298     }
 299
 300     p_mutex->init = 9999;
 301     return B_OK;
 302
 303 #endif
 304 }
 305
 306 /*****************************************************************************
 307  * vlc_mutex_destroy: destroy a mutex, inner version
 308  *****************************************************************************/
 309 int __vlc_mutex_destroy( char * psz_file, int i_line, vlc_mutex_t *p_mutex )
 310 {
 311     int i_result;
 312     /* In case of error : */
 313     int i_thread = -1;
 314     const char * psz_error = "";
 315
 316 #if defined( PTH_INIT_IN_PTH_H )
 317     return 0;
 318
 319 #elif defined( ST_INIT_IN_ST_H )
 320     i_result = st_mutex_destroy( p_mutex->mutex );
 321
 322 #elif defined( WIN32 )
 323     if( p_mutex->mutex )
 324     {
 325         CloseHandle( p_mutex->mutex );
 326     }
 327     else
 328     {
 329         DeleteCriticalSection( &p_mutex->csection );
 330     }
 331     return 0;
 332
 333 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 334     i_result = pthread_mutex_destroy( &p_mutex->mutex );
 335     if ( i_result )
 336     {
 337         i_thread = (int)pthread_self();
 338         psz_error = strerror(i_result);
 339     }
 340
 341 #elif defined( HAVE_CTHREADS_H )
 342     return 0;
 343
 344 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 345     if( p_mutex->init == 9999 )
 346     {
 347         delete_sem( p_mutex->lock );
 348     }
 349
 350     p_mutex->init = 0;
 351     return B_OK;
 352 #endif
 353
 354     if( i_result )
 355     {
 356         msg_Err( p_mutex->p_this,
 357                  "thread %d: mutex_destroy failed at %s:%d (%d:%s)",
 358                  i_thread, psz_file, i_line, i_result, psz_error );
 359     }
 360     return i_result;
 361 }
 362
 363 /*****************************************************************************
 364  * vlc_cond_init: initialize a condition
 365  *****************************************************************************/
 366 int __vlc_cond_init( vlc_object_t *p_this, vlc_cond_t *p_condvar )
 367 {
 368     p_condvar->p_this = p_this;
 369
 370 #if defined( PTH_INIT_IN_PTH_H )
 371     return pth_cond_init( &p_condvar->cond );
 372
 373 #elif defined( ST_INIT_IN_ST_H )
 374     p_condvar->cond = st_cond_new();
 375     return ( p_condvar->cond == NULL ) ? errno : 0;
 376
 377 #elif defined( WIN32 )
 378     /* Initialize counter */
 379     p_condvar->i_waiting_threads = 0;
 380
 381     /* Misc init */
 382     p_condvar->i_win9x_cv = p_this->p_libvlc->i_win9x_cv;
 383     p_condvar->SignalObjectAndWait = p_this->p_libvlc->SignalObjectAndWait;
 384
 385     if( (p_condvar->SignalObjectAndWait && !p_this->p_libvlc->b_fast_mutex)
 386         || p_condvar->i_win9x_cv == 0 )
 387     {
 388         /* Create an auto-reset event. */
 389         p_condvar->event = CreateEvent( NULL,   /* no security */
 390                                         FALSE,  /* auto-reset event */
 391                                         FALSE,  /* start non-signaled */
 392                                         NULL ); /* unnamed */
 393
 394         p_condvar->semaphore = NULL;
 395         return !p_condvar->event;
 396     }
 397     else
 398     {
 399         p_condvar->semaphore = CreateSemaphore( NULL,       /* no security */
 400                                                 0,          /* initial count */
 401                                                 0x7fffffff, /* max count */
 402                                                 NULL );     /* unnamed */
 403
 404         if( p_condvar->i_win9x_cv == 1 )
 405             /* Create a manual-reset event initially signaled. */
 406             p_condvar->event = CreateEvent( NULL, TRUE, TRUE, NULL );
 407         else
 408             /* Create a auto-reset event. */
 409             p_condvar->event = CreateEvent( NULL, FALSE, FALSE, NULL );
 410
 411         InitializeCriticalSection( &p_condvar->csection );
 412
 413         return !p_condvar->semaphore || !p_condvar->event;
 414     }
 415
 416 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 417     return pthread_cond_init( &p_condvar->cond, NULL );
 418
 419 #elif defined( HAVE_CTHREADS_H )
 420     /* condition_init() */
 421     spin_lock_init( &p_condvar->lock );
 422     cthread_queue_init( &p_condvar->queue );
 423     p_condvar->name = 0;
 424     p_condvar->implications = 0;
 425
 426     return 0;
 427
 428 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 429     if( !p_condvar )
 430     {
 431         return B_BAD_VALUE;
 432     }
 433
 434     if( p_condvar->init == 9999 )
 435     {
 436         return EALREADY;
 437     }
 438
 439     p_condvar->thread = -1;
 440     p_condvar->init = 9999;
 441     return 0;
 442 #endif
 443 }
 444
 445 /*****************************************************************************
 446  * vlc_cond_destroy: destroy a condition, inner version
 447  *****************************************************************************/
 448 int __vlc_cond_destroy( char * psz_file, int i_line, vlc_cond_t *p_condvar )
 449 {
 450     int i_result;
 451     /* In case of error : */
 452     int i_thread = -1;
 453     const char * psz_error = "";
 454
 455 #if defined( PTH_INIT_IN_PTH_H )
 456     return 0;
 457
 458 #elif defined( ST_INIT_IN_ST_H )
 459     i_result = st_cond_destroy( p_condvar->cond );
 460
 461 #elif defined( WIN32 )
 462     if( !p_condvar->semaphore )
 463         i_result = !CloseHandle( p_condvar->event );
 464     else
 465         i_result = !CloseHandle( p_condvar->event )
 466           || !CloseHandle( p_condvar->semaphore );
 467
 468 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 469     i_result = pthread_cond_destroy( &p_condvar->cond );
 470     if ( i_result )
 471     {
 472         i_thread = (int)pthread_self();
 473         psz_error = strerror(i_result);
 474     }
 475
 476 #elif defined( HAVE_CTHREADS_H )
 477     return 0;
 478
 479 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 480     p_condvar->init = 0;
 481     return 0;
 482 #endif
 483
 484     if( i_result )
 485     {
 486         msg_Err( p_condvar->p_this,
 487                  "thread %d: cond_destroy failed at %s:%d (%d:%s)",
 488                  i_thread, psz_file, i_line, i_result, psz_error );
 489     }
 490     return i_result;
 491 }
 492
 493 /*****************************************************************************
 494  * vlc_thread_create: create a thread, inner version
 495  *****************************************************************************
 496  * Note that i_priority is only taken into account on platforms supporting
 497  * userland real-time priority threads.
 498  *****************************************************************************/
 499 int __vlc_thread_create( vlc_object_t *p_this, char * psz_file, int i_line,
 500                          char *psz_name, void * ( *func ) ( void * ),
 501                          int i_priority, vlc_bool_t b_wait )
 502 {
 503     int i_ret;
 504
 505     vlc_mutex_lock( &p_this->object_lock );
 506
 507 #ifdef GPROF
 508     wrapper_t wrapper;
 509
 510     /* Initialize the wrapper structure */
 511     wrapper.func = func;
 512     wrapper.p_data = (void *)p_this;
 513     getitimer( ITIMER_PROF, &wrapper.itimer );
 514     vlc_mutex_init( p_this, &wrapper.lock );
 515     vlc_cond_init( p_this, &wrapper.wait );
 516     vlc_mutex_lock( &wrapper.lock );
 517
 518     /* Alter user-passed data so that we call the wrapper instead
 519      * of the real function */
 520     p_data = &wrapper;
 521     func = vlc_thread_wrapper;
 522 #endif
 523
 524 #if defined( PTH_INIT_IN_PTH_H )
 525     p_this->thread_id = pth_spawn( PTH_ATTR_DEFAULT, func, (void *)p_this );
 526     i_ret = 0;
 527
 528 #elif defined( ST_INIT_IN_ST_H )
 529     p_this->thread_id = st_thread_create( func, (void *)p_this, 1, 0 );
 530     i_ret = 0;
 531
 532 #elif defined( WIN32 )
 533     {
 534         unsigned threadID;
 535         /* When using the MSVCRT C library you have to use the _beginthreadex
 536          * function instead of CreateThread, otherwise you'll end up with
 537          * memory leaks and the signal functions not working */
 538         p_this->thread_id =
 539                 (HANDLE)_beginthreadex( NULL, 0, (PTHREAD_START) func,
 540                                         (void *)p_this, 0, &threadID );
 541     }
 542
 543     if ( p_this->thread_id && i_priority )
 544     {
 545         if ( !SetThreadPriority(p_this->thread_id, i_priority) )
 546         {
 547             msg_Warn( p_this, "couldn't set a faster priority" );
 548             i_priority = 0;
 549         }
 550     }
 551
 552     i_ret = ( p_this->thread_id ? 0 : 1 );
 553
 554 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 555     i_ret = pthread_create( &p_this->thread_id, NULL, func, (void *)p_this );
 556
 557     if ( i_priority )
 558     {
 559         struct sched_param param;
 560         memset( &param, 0, sizeof(struct sched_param) );
 561         param.sched_priority = i_priority;
 562         if ( pthread_setschedparam( p_this->thread_id, SCHED_RR, &param ) )
 563         {
 564             msg_Warn( p_this, "couldn't go to real-time priority" );
 565             i_priority = 0;
 566         }
 567     }
 568
 569 #elif defined( HAVE_CTHREADS_H )
 570     p_this->thread_id = cthread_fork( (cthread_fn_t)func, (any_t)p_this );
 571     i_ret = 0;
 572
 573 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 574     p_this->thread_id = spawn_thread( (thread_func)func, psz_name,
 575                                       B_NORMAL_PRIORITY, (void *)p_this );
 576     i_ret = resume_thread( p_this->thread_id );
 577
 578 #endif
 579
 580 #ifdef GPROF
 581     if( i_ret == 0 )
 582     {
 583         vlc_cond_wait( &wrapper.wait, &wrapper.lock );
 584     }
 585
 586     vlc_mutex_unlock( &wrapper.lock );
 587     vlc_mutex_destroy( &wrapper.lock );
 588     vlc_cond_destroy( &wrapper.wait );
 589 #endif
 590
 591     if( i_ret == 0 )
 592     {
 593         if( b_wait )
 594         {
 595             msg_Dbg( p_this, "waiting for thread completion" );
 596             vlc_cond_wait( &p_this->object_wait, &p_this->object_lock );
 597         }
 598
 599         p_this->b_thread = 1;
 600
 601         msg_Dbg( p_this, "thread %d (%s) created at priority %d (%s:%d)",
 602                  p_this->thread_id, psz_name, i_priority,
 603                  psz_file, i_line );
 604
 605         vlc_mutex_unlock( &p_this->object_lock );
 606     }
 607     else
 608     {
 609         msg_Err( p_this, "%s thread could not be created at %s:%d (%s)",
 610                          psz_name, psz_file, i_line, strerror(i_ret) );
 611         vlc_mutex_unlock( &p_this->object_lock );
 612     }
 613
 614     return i_ret;
 615 }
 616
 617 /*****************************************************************************
 618  * vlc_thread_ready: tell the parent thread we were successfully spawned
 619  *****************************************************************************/
 620 void __vlc_thread_ready( vlc_object_t *p_this )
 621 {
 622     vlc_mutex_lock( &p_this->object_lock );
 623     vlc_cond_signal( &p_this->object_wait );
 624     vlc_mutex_unlock( &p_this->object_lock );
 625 }
 626
 627 /*****************************************************************************
 628  * vlc_thread_join: wait until a thread exits, inner version
 629  *****************************************************************************/
 630 void __vlc_thread_join( vlc_object_t *p_this, char * psz_file, int i_line )
 631 {
 632     int i_ret = 0;
 633
 634 #if defined( PTH_INIT_IN_PTH_H )
 635     i_ret = pth_join( p_this->thread_id, NULL );
 636
 637 #elif defined( ST_INIT_IN_ST_H )
 638     i_ret = st_thread_join( p_this->thread_id, NULL );
 639
 640 #elif defined( WIN32 )
 641     WaitForSingleObject( p_this->thread_id, INFINITE );
 642
 643 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 644     i_ret = pthread_join( p_this->thread_id, NULL );
 645
 646 #elif defined( HAVE_CTHREADS_H )
 647     cthread_join( p_this->thread_id );
 648     i_ret = 1;
 649
 650 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 651     int32 exit_value;
 652     wait_for_thread( p_this->thread_id, &exit_value );
 653
 654 #endif
 655
 656     if( i_ret )
 657     {
 658         msg_Err( p_this, "thread_join(%d) failed at %s:%d (%s)",
 659                          p_this->thread_id, psz_file, i_line, strerror(i_ret) );
 660     }
 661     else
 662     {
 663         msg_Dbg( p_this, "thread %d joined (%s:%d)",
 664                          p_this->thread_id, psz_file, i_line );
 665     }
 666
 667     p_this->b_thread = 0;
 668 }
 669
 670 /*****************************************************************************
 671  * vlc_thread_wrapper: wrapper around thread functions used when profiling.
 672  *****************************************************************************/
 673 #ifdef GPROF
 674 static void *vlc_thread_wrapper( void *p_wrapper )
 675 {
 676     /* Put user data in thread-local variables */
 677     void *            p_data = ((wrapper_t*)p_wrapper)->p_data;
 678     vlc_thread_func_t func   = ((wrapper_t*)p_wrapper)->func;
 679
 680     /* Set the profile timer value */
 681     setitimer( ITIMER_PROF, &((wrapper_t*)p_wrapper)->itimer, NULL );
 682
 683     /* Tell the calling thread that we don't need its data anymore */
 684     vlc_mutex_lock( &((wrapper_t*)p_wrapper)->lock );
 685     vlc_cond_signal( &((wrapper_t*)p_wrapper)->wait );
 686     vlc_mutex_unlock( &((wrapper_t*)p_wrapper)->lock );
 687
 688     /* Call the real function */
 689     return func( p_data );
 690 }
 691 #endif