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 1.17 2002/09/29 18:16:04 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  * Prototype for GPROF wrapper
  35  *****************************************************************************/
  36 #ifdef GPROF
  37 /* Wrapper function for profiling */
  38 static void *      vlc_thread_wrapper ( void *p_wrapper );
  39
  40 #   ifdef WIN32
  41
  42 #       define ITIMER_REAL 1
  43 #       define ITIMER_PROF 2
  44
  45 struct itimerval
  46 {
  47     struct timeval it_value;
  48     struct timeval it_interval;
  49 };
  50
  51 int setitimer(int kind, const struct itimerval* itnew, struct itimerval* itold);
  52 #   endif /* WIN32 */
  53
  54 typedef struct wrapper_t
  55 {
  56     /* Data lock access */
  57     vlc_mutex_t lock;
  58     vlc_cond_t  wait;
  59
  60     /* Data used to spawn the real thread */
  61     vlc_thread_func_t func;
  62     void *p_data;
  63
  64     /* Profiling timer passed to the thread */
  65     struct itimerval itimer;
  66
  67 } wrapper_t;
  68
  69 #endif /* GPROF */
  70
  71 /*****************************************************************************
  72  * Global mutexes for lazy initialization of the threads system
  73  *****************************************************************************/
  74 static volatile int i_initializations = 0;
  75
  76 #if defined( PTH_INIT_IN_PTH_H )
  77     /* Unimplemented */
  78 #elif defined( ST_INIT_IN_ST_H )
  79     /* Unimplemented */
  80 #elif defined( WIN32 )
  81     /* Unimplemented */
  82 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
  83     static pthread_mutex_t once_mutex = PTHREAD_MUTEX_INITIALIZER;
  84 #elif defined( HAVE_CTHREADS_H )
  85     /* Unimplemented */
  86 #elif defined( HAVE_KERNEL_SCHEDULER_H )
  87     /* Unimplemented */
  88 #endif
  89
  90 /*****************************************************************************
  91  * vlc_threads_init: initialize threads system
  92  *****************************************************************************
  93  * This function requires lazy initialization of a global lock in order to
  94  * keep the library really thread-safe. Some architectures don't support this
  95  * and thus do not guarantee the complete reentrancy.
  96  *****************************************************************************/
  97 int __vlc_threads_init( vlc_object_t *p_this )
  98 {
  99     static volatile int i_status = VLC_THREADS_UNINITIALIZED;
 100     int i_ret = 0;
 101
 102 #if defined( PTH_INIT_IN_PTH_H )
 103     /* Unimplemented */
 104 #elif defined( ST_INIT_IN_ST_H )
 105     /* Unimplemented */
 106 #elif defined( WIN32 )
 107     HINSTANCE hInstLib;
 108 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 109     pthread_mutex_lock( &once_mutex );
 110 #elif defined( HAVE_CTHREADS_H )
 111     /* Unimplemented */
 112 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 113     /* Unimplemented */
 114 #endif
 115
 116     if( i_status == VLC_THREADS_UNINITIALIZED )
 117     {
 118         i_status = VLC_THREADS_PENDING;
 119
 120 #if defined( PTH_INIT_IN_PTH_H )
 121         i_ret = pth_init();
 122 #elif defined( ST_INIT_IN_ST_H )
 123         i_ret = st_init();
 124 #elif defined( WIN32 )
 125         /* dynamically get the address of SignalObjectAndWait */
 126         if( GetVersion() < 0x80000000 )
 127         {
 128             /* We are running on NT/2K/XP, we can use SignalObjectAndWait */
 129             hInstLib = LoadLibrary( "kernel32" );
 130             if( hInstLib )
 131             {
 132                 p_this->p_vlc->SignalObjectAndWait =
 133                     (SIGNALOBJECTANDWAIT)GetProcAddress( hInstLib,
 134                                                      "SignalObjectAndWait" );
 135             }
 136         }
 137         else
 138         {
 139             p_this->p_vlc->SignalObjectAndWait = NULL;
 140         }
 141
 142         p_this->p_vlc->b_fast_mutex = 0;
 143         p_this->p_vlc->i_win9x_cv = 0;
 144
 145 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 146         /* Unimplemented */
 147 #elif defined( HAVE_CTHREADS_H )
 148         /* Unimplemented */
 149 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 150         /* Unimplemented */
 151 #endif
 152
 153         if( i_ret )
 154         {
 155             i_status = VLC_THREADS_ERROR;
 156         }
 157         else
 158         {
 159             vlc_mutex_init( p_this, p_this->p_vlc->p_global_lock );
 160             i_status = VLC_THREADS_READY;
 161         }
 162     }
 163     else
 164     {
 165         i_ret = ( i_status == VLC_THREADS_READY );
 166     }
 167
 168     i_initializations++;
 169
 170 #if defined( PTH_INIT_IN_PTH_H )
 171     /* Unimplemented */
 172 #elif defined( ST_INIT_IN_ST_H )
 173     /* Unimplemented */
 174 #elif defined( WIN32 )
 175     /* Unimplemented */
 176 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 177     pthread_mutex_unlock( &once_mutex );
 178     return i_ret;
 179 #elif defined( HAVE_CTHREADS_H )
 180     /* Unimplemented */
 181 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 182     /* Unimplemented */
 183 #endif
 184
 185     /* Wait until the other thread has initialized the thread library */
 186     while( i_status == VLC_THREADS_PENDING )
 187     {
 188         msleep( THREAD_SLEEP );
 189     }
 190
 191     return i_status == VLC_THREADS_READY;
 192 }
 193
 194 /*****************************************************************************
 195  * vlc_threads_end: stop threads system
 196  *****************************************************************************
 197  * FIXME: This function is far from being threadsafe. We should undo exactly
 198  * what we did above in vlc_threads_init.
 199  *****************************************************************************/
 200 int __vlc_threads_end( vlc_object_t *p_this )
 201 {
 202 #if defined( PTH_INIT_IN_PTH_H )
 203     i_initializations--;
 204     if( i_initializations == 0 )
 205     {
 206         return pth_kill();
 207     }
 208     return 0;
 209
 210 #elif defined( ST_INIT_IN_ST_H )
 211     i_initializations--;
 212     return 0;
 213
 214 #elif defined( WIN32 )
 215     i_initializations--;
 216     return 0;
 217
 218 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 219     pthread_mutex_lock( &once_mutex );
 220     i_initializations--;
 221     pthread_mutex_unlock( &once_mutex );
 222     return 0;
 223
 224 #elif defined( HAVE_CTHREADS_H )
 225     i_initializations--;
 226     return 0;
 227
 228 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 229     i_initializations--;
 230     return 0;
 231
 232 #endif
 233 }
 234
 235 /*****************************************************************************
 236  * vlc_mutex_init: initialize a mutex
 237  *****************************************************************************/
 238 int __vlc_mutex_init( vlc_object_t *p_this, vlc_mutex_t *p_mutex )
 239 {
 240     p_mutex->p_this = p_this;
 241
 242 #if defined( PTH_INIT_IN_PTH_H )
 243     return pth_mutex_init( &p_mutex->mutex );
 244
 245 #elif defined( ST_INIT_IN_ST_H )
 246     p_mutex->mutex = st_mutex_new();
 247     return ( p_mutex->mutex == NULL ) ? errno : 0;
 248
 249 #elif defined( WIN32 )
 250     /* We use mutexes on WinNT/2K/XP because we can use the SignalObjectAndWait
 251      * function and have a 100% correct vlc_cond_wait() implementation.
 252      * As this function is not available on Win9x, we can use the faster
 253      * CriticalSections */
 254     if( p_this->p_vlc->SignalObjectAndWait && !p_this->p_vlc->b_fast_mutex )
 255     {
 256         /* We are running on NT/2K/XP, we can use SignalObjectAndWait */
 257         p_mutex->mutex = CreateMutex( 0, FALSE, 0 );
 258         return ( p_mutex->mutex != NULL ? 0 : 1 );
 259     }
 260     else
 261     {
 262         p_mutex->mutex = NULL;
 263         InitializeCriticalSection( &p_mutex->csection );
 264         return 0;
 265     }
 266
 267 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 268 #   if defined(DEBUG) && defined(SYS_LINUX)
 269     {
 270         /* Create error-checking mutex to detect problems more easily. */
 271         pthread_mutexattr_t attr;
 272         int                 i_result;
 273
 274         pthread_mutexattr_init( &attr );
 275         pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_ERRORCHECK_NP );
 276         i_result = pthread_mutex_init( &p_mutex->mutex, &attr );
 277         pthread_mutexattr_destroy( &attr );
 278         return( i_result );
 279     }
 280 #   endif
 281     return pthread_mutex_init( &p_mutex->mutex, NULL );
 282
 283 #elif defined( HAVE_CTHREADS_H )
 284     mutex_init( p_mutex );
 285     return 0;
 286
 287 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 288     /* check the arguments and whether it's already been initialized */
 289     if( p_mutex == NULL )
 290     {
 291         return B_BAD_VALUE;
 292     }
 293
 294     if( p_mutex->init == 9999 )
 295     {
 296         return EALREADY;
 297     }
 298
 299     p_mutex->lock = create_sem( 1, "BeMutex" );
 300     if( p_mutex->lock < B_NO_ERROR )
 301     {
 302         return( -1 );
 303     }
 304
 305     p_mutex->init = 9999;
 306     return B_OK;
 307
 308 #endif
 309 }
 310
 311 /*****************************************************************************
 312  * vlc_mutex_destroy: destroy a mutex, inner version
 313  *****************************************************************************/
 314 int __vlc_mutex_destroy( char * psz_file, int i_line, vlc_mutex_t *p_mutex )
 315 {
 316     int i_result;
 317     /* In case of error : */
 318     int i_thread = -1;
 319     const char * psz_error = "";
 320
 321 #if defined( PTH_INIT_IN_PTH_H )
 322     return 0;
 323
 324 #elif defined( ST_INIT_IN_ST_H )
 325     i_result = st_mutex_destroy( p_mutex->mutex );
 326
 327 #elif defined( WIN32 )
 328     if( p_mutex->mutex )
 329     {
 330         CloseHandle( p_mutex->mutex );
 331     }
 332     else
 333     {
 334         DeleteCriticalSection( &p_mutex->csection );
 335     }
 336     return 0;
 337
 338 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 339     i_result = pthread_mutex_destroy( &p_mutex->mutex );
 340     if ( i_result )
 341     {
 342         i_thread = (int)pthread_self();
 343         psz_error = strerror(i_result);
 344     }
 345
 346 #elif defined( HAVE_CTHREADS_H )
 347     return 0;
 348
 349 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 350     if( p_mutex->init == 9999 )
 351     {
 352         delete_sem( p_mutex->lock );
 353     }
 354
 355     p_mutex->init = 0;
 356     return B_OK;
 357 #endif
 358
 359     if( i_result )
 360     {
 361         msg_Err( p_mutex->p_this,
 362                  "thread %d: mutex_destroy failed at %s:%d (%d:%s)",
 363                  i_thread, psz_file, i_line, i_result, psz_error );
 364     }
 365     return i_result;
 366 }
 367
 368 /*****************************************************************************
 369  * vlc_cond_init: initialize a condition
 370  *****************************************************************************/
 371 int __vlc_cond_init( vlc_object_t *p_this, vlc_cond_t *p_condvar )
 372 {
 373     p_condvar->p_this = p_this;
 374
 375 #if defined( PTH_INIT_IN_PTH_H )
 376     return pth_cond_init( &p_condvar->cond );
 377
 378 #elif defined( ST_INIT_IN_ST_H )
 379     p_condvar->cond = st_cond_new();
 380     return ( p_condvar->cond == NULL ) ? errno : 0;
 381
 382 #elif defined( WIN32 )
 383     /* Initialize counter */
 384     p_condvar->i_waiting_threads = 0;
 385
 386     /* Misc init */
 387     p_condvar->i_win9x_cv = p_this->p_vlc->i_win9x_cv;
 388     p_condvar->SignalObjectAndWait = p_this->p_vlc->SignalObjectAndWait;
 389
 390     if( p_this->p_vlc->i_win9x_cv == 0 )
 391     {
 392         /* Create an auto-reset event. */
 393         p_condvar->event = CreateEvent( NULL,   /* no security */
 394                                         FALSE,  /* auto-reset event */
 395                                         FALSE,  /* start non-signaled */
 396                                         NULL ); /* unnamed */
 397
 398         p_condvar->semaphore = NULL;
 399         return !p_condvar->event;
 400     }
 401     else
 402     {
 403         p_condvar->semaphore = CreateSemaphore( NULL,       /* no security */
 404                                                 0,          /* initial count */
 405                                                 0x7fffffff, /* max count */
 406                                                 NULL );     /* unnamed */
 407
 408         if( p_this->p_vlc->i_win9x_cv == 1 )
 409             /* Create a manual-reset event initially signaled. */
 410             p_condvar->event = CreateEvent( NULL, TRUE, TRUE, NULL );
 411         else
 412             /* Create a auto-reset event. */
 413             p_condvar->event = CreateEvent( NULL, FALSE, FALSE, NULL );
 414
 415         InitializeCriticalSection( &p_condvar->csection );
 416
 417         return !p_condvar->semaphore || !p_condvar->event;
 418     }
 419
 420 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 421     return pthread_cond_init( &p_condvar->cond, NULL );
 422
 423 #elif defined( HAVE_CTHREADS_H )
 424     /* condition_init() */
 425     spin_lock_init( &p_condvar->lock );
 426     cthread_queue_init( &p_condvar->queue );
 427     p_condvar->name = 0;
 428     p_condvar->implications = 0;
 429
 430     return 0;
 431
 432 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 433     if( !p_condvar )
 434     {
 435         return B_BAD_VALUE;
 436     }
 437
 438     if( p_condvar->init == 9999 )
 439     {
 440         return EALREADY;
 441     }
 442
 443     p_condvar->thread = -1;
 444     p_condvar->init = 9999;
 445     return 0;
 446 #endif
 447 }
 448
 449 /*****************************************************************************
 450  * vlc_cond_destroy: destroy a condition, inner version
 451  *****************************************************************************/
 452 int __vlc_cond_destroy( char * psz_file, int i_line, vlc_cond_t *p_condvar )
 453 {
 454     int i_result;
 455     /* In case of error : */
 456     int i_thread = -1;
 457     const char * psz_error = "";
 458
 459 #if defined( PTH_INIT_IN_PTH_H )
 460     return 0;
 461
 462 #elif defined( ST_INIT_IN_ST_H )
 463     i_result = st_cond_destroy( p_condvar->cond );
 464
 465 #elif defined( WIN32 )
 466     if( !p_condvar->semaphore )
 467         i_result = !CloseHandle( p_condvar->event );
 468     else
 469         i_result = !CloseHandle( p_condvar->event )
 470           || !CloseHandle( p_condvar->semaphore );
 471
 472 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 473     i_result = pthread_cond_destroy( &p_condvar->cond );
 474     if ( i_result )
 475     {
 476         i_thread = (int)pthread_self();
 477         psz_error = strerror(i_result);
 478     }
 479
 480 #elif defined( HAVE_CTHREADS_H )
 481     return 0;
 482
 483 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 484     p_condvar->init = 0;
 485     return 0;
 486 #endif
 487
 488     if( i_result )
 489     {
 490         msg_Err( p_condvar->p_this,
 491                  "thread %d: cond_destroy failed at %s:%d (%d:%s)",
 492                  i_thread, psz_file, i_line, i_result, psz_error );
 493     }
 494     return i_result;
 495 }
 496
 497 /*****************************************************************************
 498  * vlc_thread_create: create a thread, inner version
 499  *****************************************************************************
 500  * Note that i_priority is only taken into account on platforms supporting
 501  * userland real-time priority threads.
 502  *****************************************************************************/
 503 int __vlc_thread_create( vlc_object_t *p_this, char * psz_file, int i_line,
 504                          char *psz_name, void * ( *func ) ( void * ),
 505                          int i_priority, vlc_bool_t b_wait )
 506 {
 507     int i_ret;
 508
 509     vlc_mutex_lock( &p_this->object_lock );
 510
 511 #ifdef GPROF
 512     wrapper_t wrapper;
 513
 514     /* Initialize the wrapper structure */
 515     wrapper.func = func;
 516     wrapper.p_data = (void *)p_this;
 517     getitimer( ITIMER_PROF, &wrapper.itimer );
 518     vlc_mutex_init( p_this, &wrapper.lock );
 519     vlc_cond_init( p_this, &wrapper.wait );
 520     vlc_mutex_lock( &wrapper.lock );
 521
 522     /* Alter user-passed data so that we call the wrapper instead
 523      * of the real function */
 524     p_data = &wrapper;
 525     func = vlc_thread_wrapper;
 526 #endif
 527
 528 #if defined( PTH_INIT_IN_PTH_H )
 529     p_this->thread_id = pth_spawn( PTH_ATTR_DEFAULT, func, (void *)p_this );
 530     i_ret = 0;
 531
 532 #elif defined( ST_INIT_IN_ST_H )
 533     p_this->thread_id = st_thread_create( func, (void *)p_this, 1, 0 );
 534     i_ret = 0;
 535
 536 #elif defined( WIN32 )
 537     {
 538         unsigned threadID;
 539         /* When using the MSVCRT C library you have to use the _beginthreadex
 540          * function instead of CreateThread, otherwise you'll end up with
 541          * memory leaks and the signal functions not working */
 542         p_this->thread_id =
 543                 (HANDLE)_beginthreadex( NULL, 0, (PTHREAD_START) func,
 544                                         (void *)p_this, 0, &threadID );
 545     }
 546
 547     if ( p_this->thread_id && i_priority )
 548     {
 549         if ( !SetThreadPriority(p_this->thread_id, i_priority) )
 550         {
 551             msg_Warn( p_this, "couldn't set a faster priority" );
 552             i_priority = 0;
 553         }
 554     }
 555
 556     i_ret = ( p_this->thread_id ? 0 : 1 );
 557
 558 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 559     i_ret = pthread_create( &p_this->thread_id, NULL, func, (void *)p_this );
 560
 561     if ( i_priority )
 562     {
 563         struct sched_param param;
 564         memset( &param, 0, sizeof(struct sched_param) );
 565         param.sched_priority = i_priority;
 566         if ( pthread_setschedparam( p_this->thread_id, SCHED_RR, &param ) )
 567         {
 568             msg_Warn( p_this, "couldn't go to real-time priority" );
 569             i_priority = 0;
 570         }
 571     }
 572
 573 #elif defined( HAVE_CTHREADS_H )
 574     p_this->thread_id = cthread_fork( (cthread_fn_t)func, (any_t)p_this );
 575     i_ret = 0;
 576
 577 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 578     p_this->thread_id = spawn_thread( (thread_func)func, psz_name,
 579                                       B_NORMAL_PRIORITY, (void *)p_this );
 580     i_ret = resume_thread( p_this->thread_id );
 581
 582 #endif
 583
 584 #ifdef GPROF
 585     if( i_ret == 0 )
 586     {
 587         vlc_cond_wait( &wrapper.wait, &wrapper.lock );
 588     }
 589
 590     vlc_mutex_unlock( &wrapper.lock );
 591     vlc_mutex_destroy( &wrapper.lock );
 592     vlc_cond_destroy( &wrapper.wait );
 593 #endif
 594
 595     if( i_ret == 0 )
 596     {
 597         if( b_wait )
 598         {
 599             msg_Dbg( p_this, "waiting for thread completion" );
 600             vlc_cond_wait( &p_this->object_wait, &p_this->object_lock );
 601         }
 602
 603         p_this->b_thread = 1;
 604
 605         msg_Dbg( p_this, "thread %d (%s) created at priority %d (%s:%d)",
 606                  p_this->thread_id, psz_name, i_priority,
 607                  psz_file, i_line );
 608
 609         vlc_mutex_unlock( &p_this->object_lock );
 610     }
 611     else
 612     {
 613         msg_Err( p_this, "%s thread could not be created at %s:%d (%s)",
 614                          psz_name, psz_file, i_line, strerror(i_ret) );
 615         vlc_mutex_unlock( &p_this->object_lock );
 616     }
 617
 618     return i_ret;
 619 }
 620
 621 /*****************************************************************************
 622  * vlc_thread_ready: tell the parent thread we were successfully spawned
 623  *****************************************************************************/
 624 void __vlc_thread_ready( vlc_object_t *p_this )
 625 {
 626     vlc_mutex_lock( &p_this->object_lock );
 627     vlc_cond_signal( &p_this->object_wait );
 628     vlc_mutex_unlock( &p_this->object_lock );
 629 }
 630
 631 /*****************************************************************************
 632  * vlc_thread_join: wait until a thread exits, inner version
 633  *****************************************************************************/
 634 void __vlc_thread_join( vlc_object_t *p_this, char * psz_file, int i_line )
 635 {
 636     int i_ret = 0;
 637
 638 #if defined( PTH_INIT_IN_PTH_H )
 639     i_ret = pth_join( p_this->thread_id, NULL );
 640
 641 #elif defined( ST_INIT_IN_ST_H )
 642     i_ret = st_thread_join( p_this->thread_id, NULL );
 643
 644 #elif defined( WIN32 )
 645     WaitForSingleObject( p_this->thread_id, INFINITE );
 646
 647 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 648     i_ret = pthread_join( p_this->thread_id, NULL );
 649
 650 #elif defined( HAVE_CTHREADS_H )
 651     cthread_join( p_this->thread_id );
 652     i_ret = 1;
 653
 654 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 655     int32 exit_value;
 656     wait_for_thread( p_this->thread_id, &exit_value );
 657
 658 #endif
 659
 660     if( i_ret )
 661     {
 662         msg_Err( p_this, "thread_join(%d) failed at %s:%d (%s)",
 663                          p_this->thread_id, psz_file, i_line, strerror(i_ret) );
 664     }
 665     else
 666     {
 667         msg_Dbg( p_this, "thread %d joined (%s:%d)",
 668                          p_this->thread_id, psz_file, i_line );
 669     }
 670
 671     p_this->b_thread = 0;
 672 }
 673
 674 /*****************************************************************************
 675  * vlc_thread_wrapper: wrapper around thread functions used when profiling.
 676  *****************************************************************************/
 677 #ifdef GPROF
 678 static void *vlc_thread_wrapper( void *p_wrapper )
 679 {
 680     /* Put user data in thread-local variables */
 681     void *            p_data = ((wrapper_t*)p_wrapper)->p_data;
 682     vlc_thread_func_t func   = ((wrapper_t*)p_wrapper)->func;
 683
 684     /* Set the profile timer value */
 685     setitimer( ITIMER_PROF, &((wrapper_t*)p_wrapper)->itimer, NULL );
 686
 687     /* Tell the calling thread that we don't need its data anymore */
 688     vlc_mutex_lock( &((wrapper_t*)p_wrapper)->lock );
 689     vlc_cond_signal( &((wrapper_t*)p_wrapper)->wait );
 690     vlc_mutex_unlock( &((wrapper_t*)p_wrapper)->lock );
 691
 692     /* Call the real function */
 693     return func( p_data );
 694 }
 695 #endif