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 1.36 2003/02/10 16:53:34 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 #include <stdlib.h>
  29
  30 #define VLC_THREADS_UNINITIALIZED  0
  31 #define VLC_THREADS_PENDING        1
  32 #define VLC_THREADS_ERROR          2
  33 #define VLC_THREADS_READY          3
  34
  35 /*****************************************************************************
  36  * Global mutex for lazy initialization of the threads system
  37  *****************************************************************************/
  38 static volatile int i_initializations = 0;
  39
  40 #if defined( PTH_INIT_IN_PTH_H )
  41 #elif defined( ST_INIT_IN_ST_H )
  42 #elif defined( UNDER_CE )
  43 #elif defined( WIN32 )
  44 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
  45     static pthread_mutex_t once_mutex = PTHREAD_MUTEX_INITIALIZER;
  46 #elif defined( HAVE_CTHREADS_H )
  47 #elif defined( HAVE_KERNEL_SCHEDULER_H )
  48 #endif
  49
  50 /*****************************************************************************
  51  * Global variable for named mutexes
  52  *****************************************************************************/
  53 typedef struct vlc_namedmutex_t vlc_namedmutex_t;
  54 struct vlc_namedmutex_t
  55 {
  56     vlc_mutex_t lock;
  57
  58     char *psz_name;
  59     int i_usage;
  60     vlc_namedmutex_t *p_next;
  61 };
  62
  63 /*****************************************************************************
  64  * vlc_threads_init: initialize threads system
  65  *****************************************************************************
  66  * This function requires lazy initialization of a global lock in order to
  67  * keep the library really thread-safe. Some architectures don't support this
  68  * and thus do not guarantee the complete reentrancy.
  69  *****************************************************************************/
  70 int __vlc_threads_init( vlc_object_t *p_this )
  71 {
  72     static volatile int i_status = VLC_THREADS_UNINITIALIZED;
  73
  74     libvlc_t *p_libvlc = (libvlc_t *)p_this;
  75     int i_ret = VLC_SUCCESS;
  76
  77     /* If we have lazy mutex initialization, use it. Otherwise, we just
  78      * hope nothing wrong happens. */
  79 #if defined( PTH_INIT_IN_PTH_H )
  80 #elif defined( ST_INIT_IN_ST_H )
  81 #elif defined( UNDER_CE )
  82 #elif defined( WIN32 )
  83     HINSTANCE hInstLib;
  84 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
  85     pthread_mutex_lock( &once_mutex );
  86 #elif defined( HAVE_CTHREADS_H )
  87 #elif defined( HAVE_KERNEL_SCHEDULER_H )
  88 #endif
  89
  90     if( i_status == VLC_THREADS_UNINITIALIZED )
  91     {
  92         i_status = VLC_THREADS_PENDING;
  93
  94         /* We should be safe now. Do all the initialization stuff we want. */
  95         vlc_object_create( p_libvlc, VLC_OBJECT_ROOT );
  96         p_libvlc->b_ready = VLC_FALSE;
  97
  98 #if defined( PTH_INIT_IN_PTH_H )
  99         i_ret = pth_init();
 100
 101 #elif defined( ST_INIT_IN_ST_H )
 102         i_ret = st_init();
 103
 104 #elif defined( UNDER_CE )
 105         /* Nothing to initialize */
 106
 107 #elif defined( WIN32 )
 108         /* Dynamically get the address of SignalObjectAndWait */
 109         if( GetVersion() < 0x80000000 )
 110         {
 111             /* We are running on NT/2K/XP, we can use SignalObjectAndWait */
 112             hInstLib = LoadLibrary( "kernel32" );
 113             if( hInstLib )
 114             {
 115                 p_libvlc->SignalObjectAndWait =
 116                     (SIGNALOBJECTANDWAIT)GetProcAddress( hInstLib,
 117                                                      "SignalObjectAndWait" );
 118             }
 119         }
 120         else
 121         {
 122             p_libvlc->SignalObjectAndWait = NULL;
 123         }
 124
 125         p_libvlc->b_fast_mutex = 0;
 126         p_libvlc->i_win9x_cv = 0;
 127
 128 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 129 #elif defined( HAVE_CTHREADS_H )
 130 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 131 #endif
 132
 133         if( i_ret )
 134         {
 135             i_status = VLC_THREADS_ERROR;
 136         }
 137         else
 138         {
 139             i_initializations++;
 140             i_status = VLC_THREADS_READY;
 141         }
 142     }
 143     else
 144     {
 145         /* Just increment the initialization count */
 146         i_initializations++;
 147     }
 148
 149     /* If we have lazy mutex initialization support, unlock the mutex;
 150      * otherwize, do a naive wait loop. */
 151 #if defined( PTH_INIT_IN_PTH_H )
 152     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 153 #elif defined( ST_INIT_IN_ST_H )
 154     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 155 #elif defined( UNDER_CE )
 156     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 157 #elif defined( WIN32 )
 158     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 159 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 160     pthread_mutex_unlock( &once_mutex );
 161 #elif defined( HAVE_CTHREADS_H )
 162     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 163 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 164     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 165 #endif
 166
 167     if( i_status != VLC_THREADS_READY )
 168     {
 169         return VLC_ETHREAD;
 170     }
 171
 172     return i_ret;
 173 }
 174
 175 /*****************************************************************************
 176  * vlc_threads_end: stop threads system
 177  *****************************************************************************
 178  * FIXME: This function is far from being threadsafe. We should undo exactly
 179  * what we did above in vlc_threads_init.
 180  *****************************************************************************/
 181 int __vlc_threads_end( vlc_object_t *p_this )
 182 {
 183 #if defined( PTH_INIT_IN_PTH_H )
 184     i_initializations--;
 185     if( i_initializations == 0 )
 186     {
 187         return pth_kill();
 188     }
 189
 190 #elif defined( ST_INIT_IN_ST_H )
 191     i_initializations--;
 192
 193 #elif defined( UNDER_CE )
 194     i_initializations--;
 195
 196 #elif defined( WIN32 )
 197     i_initializations--;
 198
 199 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 200     pthread_mutex_lock( &once_mutex );
 201     i_initializations--;
 202     pthread_mutex_unlock( &once_mutex );
 203
 204 #elif defined( HAVE_CTHREADS_H )
 205     i_initializations--;
 206
 207 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 208     i_initializations--;
 209
 210 #endif
 211     return VLC_SUCCESS;
 212 }
 213
 214 /*****************************************************************************
 215  * Prototype for GPROF wrapper
 216  *****************************************************************************/
 217 #ifdef GPROF
 218 typedef void *(*vlc_thread_func_t)(void *p_data);
 219
 220 /* Wrapper function for profiling */
 221 static void *      vlc_thread_wrapper ( void *p_wrapper );
 222
 223 #   if defined( WIN32 ) && !defined( UNDER_CE )
 224
 225 #       define ITIMER_REAL 1
 226 #       define ITIMER_PROF 2
 227
 228 struct itimerval
 229 {
 230     struct timeval it_value;
 231     struct timeval it_interval;
 232 };
 233
 234 int setitimer(int kind, const struct itimerval* itnew, struct itimerval* itold);
 235 #   endif /* WIN32 && !UNDER_CE */
 236
 237 typedef struct wrapper_t
 238 {
 239     /* Data lock access */
 240     vlc_mutex_t lock;
 241     vlc_cond_t  wait;
 242
 243     /* Data used to spawn the real thread */
 244     vlc_thread_func_t func;
 245     void *p_data;
 246
 247     /* Profiling timer passed to the thread */
 248     struct itimerval itimer;
 249
 250 } wrapper_t;
 251
 252 #endif /* GPROF */
 253
 254 /*****************************************************************************
 255  * vlc_mutex_init: initialize a mutex
 256  *****************************************************************************/
 257 int __vlc_mutex_init( vlc_object_t *p_this, vlc_mutex_t *p_mutex )
 258 {
 259     p_mutex->p_this = p_this;
 260
 261 #if defined( PTH_INIT_IN_PTH_H )
 262     return pth_mutex_init( &p_mutex->mutex );
 263
 264 #elif defined( ST_INIT_IN_ST_H )
 265     p_mutex->mutex = st_mutex_new();
 266     return ( p_mutex->mutex == NULL ) ? errno : 0;
 267
 268 #elif defined( UNDER_CE )
 269     InitializeCriticalSection( &p_mutex->csection );
 270     return 0;
 271
 272 #elif defined( WIN32 )
 273     /* We use mutexes on WinNT/2K/XP because we can use the SignalObjectAndWait
 274      * function and have a 100% correct vlc_cond_wait() implementation.
 275      * As this function is not available on Win9x, we can use the faster
 276      * CriticalSections */
 277     if( p_this->p_libvlc->SignalObjectAndWait &&
 278         !p_this->p_libvlc->b_fast_mutex )
 279     {
 280         /* We are running on NT/2K/XP, we can use SignalObjectAndWait */
 281         p_mutex->mutex = CreateMutex( 0, FALSE, 0 );
 282         return ( p_mutex->mutex != NULL ? 0 : 1 );
 283     }
 284     else
 285     {
 286         p_mutex->mutex = NULL;
 287         InitializeCriticalSection( &p_mutex->csection );
 288         return 0;
 289     }
 290
 291 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 292 #   if defined(DEBUG) && defined(SYS_LINUX)
 293     {
 294         /* Create error-checking mutex to detect problems more easily. */
 295         pthread_mutexattr_t attr;
 296         int                 i_result;
 297
 298         pthread_mutexattr_init( &attr );
 299         pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_ERRORCHECK_NP );
 300         i_result = pthread_mutex_init( &p_mutex->mutex, &attr );
 301         pthread_mutexattr_destroy( &attr );
 302         return( i_result );
 303     }
 304 #   endif
 305     return pthread_mutex_init( &p_mutex->mutex, NULL );
 306
 307 #elif defined( HAVE_CTHREADS_H )
 308     mutex_init( p_mutex );
 309     return 0;
 310
 311 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 312     /* check the arguments and whether it's already been initialized */
 313     if( p_mutex == NULL )
 314     {
 315         return B_BAD_VALUE;
 316     }
 317
 318     if( p_mutex->init == 9999 )
 319     {
 320         return EALREADY;
 321     }
 322
 323     p_mutex->lock = create_sem( 1, "BeMutex" );
 324     if( p_mutex->lock < B_NO_ERROR )
 325     {
 326         return( -1 );
 327     }
 328
 329     p_mutex->init = 9999;
 330     return B_OK;
 331
 332 #endif
 333 }
 334
 335 /*****************************************************************************
 336  * vlc_mutex_destroy: destroy a mutex, inner version
 337  *****************************************************************************/
 338 int __vlc_mutex_destroy( char * psz_file, int i_line, vlc_mutex_t *p_mutex )
 339 {
 340     int i_result;
 341     /* In case of error : */
 342     int i_thread = -1;
 343     const char * psz_error = "";
 344
 345 #if defined( PTH_INIT_IN_PTH_H )
 346     return 0;
 347
 348 #elif defined( ST_INIT_IN_ST_H )
 349     i_result = st_mutex_destroy( p_mutex->mutex );
 350
 351 #elif defined( UNDER_CE )
 352     DeleteCriticalSection( &p_mutex->csection );
 353     return 0;
 354
 355 #elif defined( WIN32 )
 356     if( p_mutex->mutex )
 357     {
 358         CloseHandle( p_mutex->mutex );
 359     }
 360     else
 361     {
 362         DeleteCriticalSection( &p_mutex->csection );
 363     }
 364     return 0;
 365
 366 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 367     i_result = pthread_mutex_destroy( &p_mutex->mutex );
 368     if ( i_result )
 369     {
 370         i_thread = (int)pthread_self();
 371         psz_error = strerror(i_result);
 372     }
 373
 374 #elif defined( HAVE_CTHREADS_H )
 375     return 0;
 376
 377 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 378     if( p_mutex->init == 9999 )
 379     {
 380         delete_sem( p_mutex->lock );
 381     }
 382
 383     p_mutex->init = 0;
 384     return B_OK;
 385 #endif
 386
 387     if( i_result )
 388     {
 389         msg_Err( p_mutex->p_this,
 390                  "thread %d: mutex_destroy failed at %s:%d (%d:%s)",
 391                  i_thread, psz_file, i_line, i_result, psz_error );
 392     }
 393     return i_result;
 394 }
 395
 396 /*****************************************************************************
 397  * vlc_cond_init: initialize a condition
 398  *****************************************************************************/
 399 int __vlc_cond_init( vlc_object_t *p_this, vlc_cond_t *p_condvar )
 400 {
 401     p_condvar->p_this = p_this;
 402
 403 #if defined( PTH_INIT_IN_PTH_H )
 404     return pth_cond_init( &p_condvar->cond );
 405
 406 #elif defined( ST_INIT_IN_ST_H )
 407     p_condvar->cond = st_cond_new();
 408     return ( p_condvar->cond == NULL ) ? errno : 0;
 409
 410 #elif defined( UNDER_CE )
 411     /* Initialize counter */
 412     p_condvar->i_waiting_threads = 0;
 413
 414     /* Create an auto-reset event. */
 415     p_condvar->event = CreateEvent( NULL,   /* no security */
 416                                     FALSE,  /* auto-reset event */
 417                                     FALSE,  /* start non-signaled */
 418                                     NULL ); /* unnamed */
 419     return !p_condvar->event;
 420
 421 #elif defined( WIN32 )
 422     /* Initialize counter */
 423     p_condvar->i_waiting_threads = 0;
 424
 425     /* Misc init */
 426     p_condvar->i_win9x_cv = p_this->p_libvlc->i_win9x_cv;
 427     p_condvar->SignalObjectAndWait = p_this->p_libvlc->SignalObjectAndWait;
 428
 429     if( (p_condvar->SignalObjectAndWait && !p_this->p_libvlc->b_fast_mutex)
 430         || p_condvar->i_win9x_cv == 0 )
 431     {
 432         /* Create an auto-reset event. */
 433         p_condvar->event = CreateEvent( NULL,   /* no security */
 434                                         FALSE,  /* auto-reset event */
 435                                         FALSE,  /* start non-signaled */
 436                                         NULL ); /* unnamed */
 437
 438         p_condvar->semaphore = NULL;
 439         return !p_condvar->event;
 440     }
 441     else
 442     {
 443         p_condvar->semaphore = CreateSemaphore( NULL,       /* no security */
 444                                                 0,          /* initial count */
 445                                                 0x7fffffff, /* max count */
 446                                                 NULL );     /* unnamed */
 447
 448         if( p_condvar->i_win9x_cv == 1 )
 449             /* Create a manual-reset event initially signaled. */
 450             p_condvar->event = CreateEvent( NULL, TRUE, TRUE, NULL );
 451         else
 452             /* Create a auto-reset event. */
 453             p_condvar->event = CreateEvent( NULL, FALSE, FALSE, NULL );
 454
 455         InitializeCriticalSection( &p_condvar->csection );
 456
 457         return !p_condvar->semaphore || !p_condvar->event;
 458     }
 459
 460 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 461     return pthread_cond_init( &p_condvar->cond, NULL );
 462
 463 #elif defined( HAVE_CTHREADS_H )
 464     /* condition_init() */
 465     spin_lock_init( &p_condvar->lock );
 466     cthread_queue_init( &p_condvar->queue );
 467     p_condvar->name = 0;
 468     p_condvar->implications = 0;
 469
 470     return 0;
 471
 472 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 473     if( !p_condvar )
 474     {
 475         return B_BAD_VALUE;
 476     }
 477
 478     if( p_condvar->init == 9999 )
 479     {
 480         return EALREADY;
 481     }
 482
 483     p_condvar->thread = -1;
 484     p_condvar->init = 9999;
 485     return 0;
 486 #endif
 487 }
 488
 489 /*****************************************************************************
 490  * vlc_cond_destroy: destroy a condition, inner version
 491  *****************************************************************************/
 492 int __vlc_cond_destroy( char * psz_file, int i_line, vlc_cond_t *p_condvar )
 493 {
 494     int i_result;
 495     /* In case of error : */
 496     int i_thread = -1;
 497     const char * psz_error = "";
 498
 499 #if defined( PTH_INIT_IN_PTH_H )
 500     return 0;
 501
 502 #elif defined( ST_INIT_IN_ST_H )
 503     i_result = st_cond_destroy( p_condvar->cond );
 504
 505 #elif defined( UNDER_CE )
 506     i_result = !CloseHandle( p_condvar->event );
 507
 508 #elif defined( WIN32 )
 509     if( !p_condvar->semaphore )
 510         i_result = !CloseHandle( p_condvar->event );
 511     else
 512         i_result = !CloseHandle( p_condvar->event )
 513           || !CloseHandle( p_condvar->semaphore );
 514
 515 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 516     i_result = pthread_cond_destroy( &p_condvar->cond );
 517     if ( i_result )
 518     {
 519         i_thread = (int)pthread_self();
 520         psz_error = strerror(i_result);
 521     }
 522
 523 #elif defined( HAVE_CTHREADS_H )
 524     return 0;
 525
 526 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 527     p_condvar->init = 0;
 528     return 0;
 529 #endif
 530
 531     if( i_result )
 532     {
 533         msg_Err( p_condvar->p_this,
 534                  "thread %d: cond_destroy failed at %s:%d (%d:%s)",
 535                  i_thread, psz_file, i_line, i_result, psz_error );
 536     }
 537     return i_result;
 538 }
 539
 540 /*****************************************************************************
 541  * vlc_thread_create: create a thread, inner version
 542  *****************************************************************************
 543  * Note that i_priority is only taken into account on platforms supporting
 544  * userland real-time priority threads.
 545  *****************************************************************************/
 546 int __vlc_thread_create( vlc_object_t *p_this, char * psz_file, int i_line,
 547                          char *psz_name, void * ( *func ) ( void * ),
 548                          int i_priority, vlc_bool_t b_wait )
 549 {
 550     int i_ret;
 551     void *p_data;
 552
 553     vlc_mutex_lock( &p_this->object_lock );
 554
 555 #ifdef GPROF
 556     wrapper_t wrapper;
 557
 558     /* Initialize the wrapper structure */
 559     wrapper.func = func;
 560     wrapper.p_data = (void *)p_this;
 561     getitimer( ITIMER_PROF, &wrapper.itimer );
 562     vlc_mutex_init( p_this, &wrapper.lock );
 563     vlc_cond_init( p_this, &wrapper.wait );
 564     vlc_mutex_lock( &wrapper.lock );
 565
 566     /* Alter user-passed data so that we call the wrapper instead
 567      * of the real function */
 568     p_data = &wrapper;
 569     func = vlc_thread_wrapper;
 570 #else
 571     p_data = (void *)p_this;
 572 #endif
 573
 574 #if defined( PTH_INIT_IN_PTH_H )
 575     p_this->thread_id = pth_spawn( PTH_ATTR_DEFAULT, func, p_data );
 576     i_ret = 0;
 577
 578 #elif defined( ST_INIT_IN_ST_H )
 579     p_this->thread_id = st_thread_create( func, p_data, 1, 0 );
 580     i_ret = 0;
 581
 582 #elif defined( WIN32 ) || defined( UNDER_CE )
 583     {
 584         unsigned threadID;
 585         /* When using the MSVCRT C library you have to use the _beginthreadex
 586          * function instead of CreateThread, otherwise you'll end up with
 587          * memory leaks and the signal functions not working (see Microsoft
 588          * Knowledge Base, article 104641) */
 589         p_this->thread_id =
 590 #if defined( UNDER_CE )
 591                 (HANDLE)CreateThread( NULL, 0, (PTHREAD_START) func,
 592                                       p_data, 0, &threadID );
 593 #else
 594                 (HANDLE)_beginthreadex( NULL, 0, (PTHREAD_START) func,
 595                                         p_data, 0, &threadID );
 596 #endif
 597     }
 598
 599     if ( p_this->thread_id && i_priority )
 600     {
 601         if ( !SetThreadPriority(p_this->thread_id, i_priority) )
 602         {
 603             msg_Warn( p_this, "couldn't set a faster priority" );
 604             i_priority = 0;
 605         }
 606     }
 607
 608     i_ret = ( p_this->thread_id ? 0 : 1 );
 609
 610 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 611     i_ret = pthread_create( &p_this->thread_id, NULL, func, p_data );
 612
 613     if ( i_priority )
 614     {
 615         int i_error;
 616         struct sched_param param;
 617         memset( &param, 0, sizeof(struct sched_param) );
 618         param.sched_priority = i_priority;
 619         if ( (i_error = pthread_setschedparam( p_this->thread_id,
 620                                                SCHED_RR, &param )) )
 621         {
 622             msg_Warn( p_this, "couldn't go to real-time priority (%s:%d): %s",
 623                       psz_file, i_line, strerror(i_error) );
 624             i_priority = 0;
 625         }
 626
 627     }
 628
 629 #elif defined( HAVE_CTHREADS_H )
 630     p_this->thread_id = cthread_fork( (cthread_fn_t)func, (any_t)p_data );
 631     i_ret = 0;
 632
 633 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 634     p_this->thread_id = spawn_thread( (thread_func)func, psz_name,
 635                                       i_priority, p_data );
 636     i_ret = resume_thread( p_this->thread_id );
 637
 638 #endif
 639
 640 #ifdef GPROF
 641     if( i_ret == 0 )
 642     {
 643         vlc_cond_wait( &wrapper.wait, &wrapper.lock );
 644     }
 645
 646     vlc_mutex_unlock( &wrapper.lock );
 647     vlc_mutex_destroy( &wrapper.lock );
 648     vlc_cond_destroy( &wrapper.wait );
 649 #endif
 650
 651     if( i_ret == 0 )
 652     {
 653         if( b_wait )
 654         {
 655             msg_Dbg( p_this, "waiting for thread completion" );
 656             vlc_cond_wait( &p_this->object_wait, &p_this->object_lock );
 657         }
 658
 659         p_this->b_thread = 1;
 660
 661         msg_Dbg( p_this, "thread %d (%s) created at priority %d (%s:%d)",
 662                  (int)p_this->thread_id, psz_name, i_priority,
 663                  psz_file, i_line );
 664
 665         vlc_mutex_unlock( &p_this->object_lock );
 666     }
 667     else
 668     {
 669 #ifdef HAVE_STRERROR
 670         msg_Err( p_this, "%s thread could not be created at %s:%d (%s)",
 671                          psz_name, psz_file, i_line, strerror(i_ret) );
 672 #else
 673         msg_Err( p_this, "%s thread could not be created at %s:%d",
 674                          psz_name, psz_file, i_line );
 675 #endif
 676         vlc_mutex_unlock( &p_this->object_lock );
 677     }
 678
 679     return i_ret;
 680 }
 681
 682 /*****************************************************************************
 683  * vlc_thread_set_priority: set the priority of the current thread when we
 684  * couldn't set it in vlc_thread_create (for instance for the main thread)
 685  *****************************************************************************/
 686 int __vlc_thread_set_priority( vlc_object_t *p_this, char * psz_file,
 687                                int i_line, int i_priority )
 688 {
 689 #if defined( WIN32 ) || defined( UNDER_CE )
 690     if ( !SetThreadPriority(GetCurrentThread(), i_priority) )
 691     {
 692         msg_Warn( p_this, "couldn't set a faster priority" );
 693         return 1;
 694     }
 695
 696 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 697     if ( i_priority )
 698     {
 699         int i_error;
 700         struct sched_param param;
 701         memset( &param, 0, sizeof(struct sched_param) );
 702         param.sched_priority = i_priority;
 703         if ( (i_error = pthread_setschedparam( pthread_self(),
 704                                                SCHED_RR, &param )) )
 705         {
 706             msg_Warn( p_this, "couldn't go to real-time priority (%s:%d): %s",
 707                       psz_file, i_line, strerror(i_error) );
 708             i_priority = 0;
 709         }
 710     }
 711
 712 #endif
 713
 714     return 0;
 715 }
 716
 717 /*****************************************************************************
 718  * vlc_thread_ready: tell the parent thread we were successfully spawned
 719  *****************************************************************************/
 720 void __vlc_thread_ready( vlc_object_t *p_this )
 721 {
 722     vlc_mutex_lock( &p_this->object_lock );
 723     vlc_cond_signal( &p_this->object_wait );
 724     vlc_mutex_unlock( &p_this->object_lock );
 725 }
 726
 727 /*****************************************************************************
 728  * vlc_thread_join: wait until a thread exits, inner version
 729  *****************************************************************************/
 730 void __vlc_thread_join( vlc_object_t *p_this, char * psz_file, int i_line )
 731 {
 732     int i_ret = 0;
 733
 734 #if defined( PTH_INIT_IN_PTH_H )
 735     i_ret = pth_join( p_this->thread_id, NULL );
 736
 737 #elif defined( ST_INIT_IN_ST_H )
 738     i_ret = st_thread_join( p_this->thread_id, NULL );
 739
 740 #elif defined( UNDER_CE )
 741     WaitForSingleObject( p_this->thread_id, INFINITE );
 742
 743 #elif defined( WIN32 )
 744     WaitForSingleObject( p_this->thread_id, INFINITE );
 745
 746 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 747     i_ret = pthread_join( p_this->thread_id, NULL );
 748
 749 #elif defined( HAVE_CTHREADS_H )
 750     cthread_join( p_this->thread_id );
 751     i_ret = 1;
 752
 753 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 754     int32 exit_value;
 755     wait_for_thread( p_this->thread_id, &exit_value );
 756
 757 #endif
 758
 759     if( i_ret )
 760     {
 761 #ifdef HAVE_STRERROR
 762         msg_Err( p_this, "thread_join(%d) failed at %s:%d (%s)",
 763                          (int)p_this->thread_id, psz_file, i_line,
 764                          strerror(i_ret) );
 765 #else
 766         msg_Err( p_this, "thread_join(%d) failed at %s:%d",
 767                          (int)p_this->thread_id, psz_file, i_line );
 768 #endif
 769     }
 770     else
 771     {
 772         msg_Dbg( p_this, "thread %d joined (%s:%d)",
 773                          (int)p_this->thread_id, psz_file, i_line );
 774     }
 775
 776     p_this->b_thread = 0;
 777 }
 778
 779 /*****************************************************************************
 780  * vlc_thread_wrapper: wrapper around thread functions used when profiling.
 781  *****************************************************************************/
 782 #ifdef GPROF
 783 static void *vlc_thread_wrapper( void *p_wrapper )
 784 {
 785     /* Put user data in thread-local variables */
 786     void *            p_data = ((wrapper_t*)p_wrapper)->p_data;
 787     vlc_thread_func_t func   = ((wrapper_t*)p_wrapper)->func;
 788
 789     /* Set the profile timer value */
 790     setitimer( ITIMER_PROF, &((wrapper_t*)p_wrapper)->itimer, NULL );
 791
 792     /* Tell the calling thread that we don't need its data anymore */
 793     vlc_mutex_lock( &((wrapper_t*)p_wrapper)->lock );
 794     vlc_cond_signal( &((wrapper_t*)p_wrapper)->wait );
 795     vlc_mutex_unlock( &((wrapper_t*)p_wrapper)->lock );
 796
 797     /* Call the real function */
 798     return func( p_data );
 799 }
 800 #endif