git.sesse.net Git - vlc/blob - src/misc/threads.c

   1 /*****************************************************************************
   2  * threads.c : threads implementation for the VideoLAN client
   3  *****************************************************************************
   4  * Copyright (C) 1999-2007 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Jean-Marc Dressler <polux@via.ecp.fr>
   8  *          Samuel Hocevar <sam@zoy.org>
   9  *          Gildas Bazin <gbazin@netcourrier.com>
  10  *          Clément Sténac
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  25  *****************************************************************************/
  26
  27 #include <vlc/vlc.h>
  28
  29 #include "libvlc.h"
  30 #include <assert.h>
  31 #ifdef HAVE_UNISTD_H
  32 # include <unistd.h>
  33 #endif
  34
  35 #define VLC_THREADS_UNINITIALIZED  0
  36 #define VLC_THREADS_PENDING        1
  37 #define VLC_THREADS_ERROR          2
  38 #define VLC_THREADS_READY          3
  39
  40 /*****************************************************************************
  41  * Global mutex for lazy initialization of the threads system
  42  *****************************************************************************/
  43 static volatile unsigned i_initializations = 0;
  44 static volatile int i_status = VLC_THREADS_UNINITIALIZED;
  45 static vlc_object_t *p_root;
  46
  47 #if defined( PTH_INIT_IN_PTH_H )
  48 #elif defined( ST_INIT_IN_ST_H )
  49 #elif defined( UNDER_CE )
  50 #elif defined( WIN32 )
  51
  52 /* following is only available on NT/2000/XP and above */
  53 static SIGNALOBJECTANDWAIT pf_SignalObjectAndWait = NULL;
  54
  55 /*
  56 ** On Windows NT/2K/XP we use a slow mutex implementation but which
  57 ** allows us to correctly implement condition variables.
  58 ** You can also use the faster Win9x implementation but you might
  59 ** experience problems with it.
  60 */
  61 static vlc_bool_t          b_fast_mutex = VLC_FALSE;
  62 /*
  63 ** On Windows 9x/Me you can use a fast but incorrect condition variables
  64 ** implementation (more precisely there is a possibility for a race
  65 ** condition to happen).
  66 ** However it is possible to use slower alternatives which are more robust.
  67 ** Currently you can choose between implementation 0 (which is the
  68 ** fastest but slightly incorrect), 1 (default) and 2.
  69 */
  70 static int i_win9x_cv = 1;
  71
  72 #elif defined( HAVE_KERNEL_SCHEDULER_H )
  73 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
  74 static pthread_mutex_t once_mutex = PTHREAD_MUTEX_INITIALIZER;
  75 #elif defined( HAVE_CTHREADS_H )
  76 #endif
  77
  78 vlc_threadvar_t msg_context_global_key;
  79
  80 /*****************************************************************************
  81  * vlc_threads_init: initialize threads system
  82  *****************************************************************************
  83  * This function requires lazy initialization of a global lock in order to
  84  * keep the library really thread-safe. Some architectures don't support this
  85  * and thus do not guarantee the complete reentrancy.
  86  *****************************************************************************/
  87 int __vlc_threads_init( vlc_object_t *p_this )
  88 {
  89     libvlc_global_data_t *p_libvlc_global = (libvlc_global_data_t *)p_this;
  90     int i_ret = VLC_SUCCESS;
  91
  92     /* If we have lazy mutex initialization, use it. Otherwise, we just
  93      * hope nothing wrong happens. */
  94 #if defined( PTH_INIT_IN_PTH_H )
  95 #elif defined( ST_INIT_IN_ST_H )
  96 #elif defined( UNDER_CE )
  97 #elif defined( WIN32 )
  98     if( IsDebuggerPresent() )
  99     {
 100         /* SignalObjectAndWait() is problematic under a debugger */
 101         b_fast_mutex = VLC_TRUE;
 102         i_win9x_cv = 1;
 103     }
 104 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 105 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 106     pthread_mutex_lock( &once_mutex );
 107 #elif defined( HAVE_CTHREADS_H )
 108 #endif
 109
 110     if( i_status == VLC_THREADS_UNINITIALIZED )
 111     {
 112         i_status = VLC_THREADS_PENDING;
 113
 114         /* We should be safe now. Do all the initialization stuff we want. */
 115         p_libvlc_global->b_ready = VLC_FALSE;
 116
 117 #if defined( PTH_INIT_IN_PTH_H )
 118         i_ret = ( pth_init() == FALSE );
 119
 120 #elif defined( ST_INIT_IN_ST_H )
 121         i_ret = st_init();
 122
 123 #elif defined( UNDER_CE )
 124         /* Nothing to initialize */
 125
 126 #elif defined( WIN32 )
 127         /* Dynamically get the address of SignalObjectAndWait */
 128         if( GetVersion() < 0x80000000 )
 129         {
 130             HINSTANCE hInstLib;
 131
 132             /* We are running on NT/2K/XP, we can use SignalObjectAndWait */
 133             hInstLib = LoadLibrary( "kernel32" );
 134             if( hInstLib )
 135             {
 136                 pf_SignalObjectAndWait =
 137                     (SIGNALOBJECTANDWAIT)GetProcAddress( hInstLib,
 138                                                      "SignalObjectAndWait" );
 139             }
 140         }
 141
 142 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 143 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 144 #elif defined( HAVE_CTHREADS_H )
 145 #endif
 146
 147         p_root = vlc_object_create( p_libvlc_global, VLC_OBJECT_GLOBAL );
 148         if( p_root == NULL )
 149             i_ret = VLC_ENOMEM;
 150
 151         if( i_ret )
 152         {
 153             i_status = VLC_THREADS_ERROR;
 154         }
 155         else
 156         {
 157             i_initializations++;
 158             i_status = VLC_THREADS_READY;
 159         }
 160
 161         vlc_threadvar_create( p_root, &msg_context_global_key );
 162     }
 163     else
 164     {
 165         /* Just increment the initialization count */
 166         i_initializations++;
 167     }
 168
 169     /* If we have lazy mutex initialization support, unlock the mutex;
 170      * otherwize, do a naive wait loop. */
 171 #if defined( PTH_INIT_IN_PTH_H )
 172     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 173 #elif defined( ST_INIT_IN_ST_H )
 174     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 175 #elif defined( UNDER_CE )
 176     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 177 #elif defined( WIN32 )
 178     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 179 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 180     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 181 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 182     pthread_mutex_unlock( &once_mutex );
 183 #elif defined( HAVE_CTHREADS_H )
 184     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 185 #endif
 186
 187     if( i_status != VLC_THREADS_READY )
 188     {
 189         return VLC_ETHREAD;
 190     }
 191
 192     return i_ret;
 193 }
 194
 195 /*****************************************************************************
 196  * vlc_threads_end: stop threads system
 197  *****************************************************************************
 198  * FIXME: This function is far from being threadsafe.
 199  *****************************************************************************/
 200 int __vlc_threads_end( vlc_object_t *p_this )
 201 {
 202     (void)p_this;
 203 #if defined( PTH_INIT_IN_PTH_H )
 204 #elif defined( ST_INIT_IN_ST_H )
 205 #elif defined( UNDER_CE )
 206 #elif defined( WIN32 )
 207 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 208 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 209     pthread_mutex_lock( &once_mutex );
 210 #elif defined( HAVE_CTHREADS_H )
 211 #endif
 212
 213     if( i_initializations == 0 )
 214         return VLC_EGENERIC;
 215
 216     i_initializations--;
 217     if( i_initializations == 0 )
 218     {
 219         i_status = VLC_THREADS_UNINITIALIZED;
 220         vlc_object_destroy( p_root );
 221     }
 222
 223 #if defined( PTH_INIT_IN_PTH_H )
 224     if( i_initializations == 0 )
 225     {
 226         return ( pth_kill() == FALSE );
 227     }
 228
 229 #elif defined( ST_INIT_IN_ST_H )
 230 #elif defined( UNDER_CE )
 231 #elif defined( WIN32 )
 232 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 233 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 234     pthread_mutex_unlock( &once_mutex );
 235 #elif defined( HAVE_CTHREADS_H )
 236 #endif
 237     return VLC_SUCCESS;
 238 }
 239
 240 /*****************************************************************************
 241  * vlc_mutex_init: initialize a mutex
 242  *****************************************************************************/
 243 int __vlc_mutex_init( vlc_object_t *p_this, vlc_mutex_t *p_mutex )
 244 {
 245     assert( p_this );
 246     p_mutex->p_this = p_this;
 247
 248 #if defined( PTH_INIT_IN_PTH_H )
 249     return ( pth_mutex_init( &p_mutex->mutex ) == FALSE );
 250
 251 #elif defined( ST_INIT_IN_ST_H )
 252     p_mutex->mutex = st_mutex_new();
 253     return ( p_mutex->mutex == NULL ) ? errno : 0;
 254
 255 #elif defined( UNDER_CE )
 256     InitializeCriticalSection( &p_mutex->csection );
 257     return 0;
 258
 259 #elif defined( WIN32 )
 260     /* We use mutexes on WinNT/2K/XP because we can use the SignalObjectAndWait
 261      * function and have a 100% correct vlc_cond_wait() implementation.
 262      * As this function is not available on Win9x, we can use the faster
 263      * CriticalSections */
 264     if( pf_SignalObjectAndWait && !b_fast_mutex )
 265     {
 266         /* We are running on NT/2K/XP, we can use SignalObjectAndWait */
 267         p_mutex->mutex = CreateMutex( 0, FALSE, 0 );
 268         return ( p_mutex->mutex != NULL ? 0 : 1 );
 269     }
 270     else
 271     {
 272         p_mutex->mutex = NULL;
 273         InitializeCriticalSection( &p_mutex->csection );
 274         return 0;
 275     }
 276
 277 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 278     /* check the arguments and whether it's already been initialized */
 279     if( p_mutex == NULL )
 280     {
 281         return B_BAD_VALUE;
 282     }
 283
 284     if( p_mutex->init == 9999 )
 285     {
 286         return EALREADY;
 287     }
 288
 289     p_mutex->lock = create_sem( 1, "BeMutex" );
 290     if( p_mutex->lock < B_NO_ERROR )
 291     {
 292         return( -1 );
 293     }
 294
 295     p_mutex->init = 9999;
 296     return B_OK;
 297
 298 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 299 # if defined(DEBUG)
 300     {
 301         /* Create error-checking mutex to detect problems more easily. */
 302         pthread_mutexattr_t attr;
 303         int                 i_result;
 304
 305         pthread_mutexattr_init( &attr );
 306 #   if defined(SYS_LINUX)
 307         pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_ERRORCHECK_NP );
 308 #   else
 309         pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_ERRORCHECK );
 310 #   endif
 311         i_result = pthread_mutex_init( &p_mutex->mutex, &attr );
 312         pthread_mutexattr_destroy( &attr );
 313         return( i_result );
 314     }
 315 # endif
 316     return pthread_mutex_init( &p_mutex->mutex, NULL );
 317
 318 #elif defined( HAVE_CTHREADS_H )
 319     mutex_init( p_mutex );
 320     return 0;
 321
 322 #endif
 323 }
 324
 325 /*****************************************************************************
 326  * vlc_mutex_destroy: destroy a mutex, inner version
 327  *****************************************************************************/
 328 int __vlc_mutex_destroy( const char * psz_file, int i_line, vlc_mutex_t *p_mutex )
 329 {
 330     int i_result;
 331     /* In case of error : */
 332     int i_thread = -1;
 333
 334 #if defined( PTH_INIT_IN_PTH_H )
 335     return 0;
 336
 337 #elif defined( ST_INIT_IN_ST_H )
 338     i_result = st_mutex_destroy( p_mutex->mutex );
 339
 340 #elif defined( UNDER_CE )
 341     DeleteCriticalSection( &p_mutex->csection );
 342     return 0;
 343
 344 #elif defined( WIN32 )
 345     if( p_mutex->mutex )
 346     {
 347         CloseHandle( p_mutex->mutex );
 348     }
 349     else
 350     {
 351         DeleteCriticalSection( &p_mutex->csection );
 352     }
 353     return 0;
 354
 355 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 356     if( p_mutex->init == 9999 )
 357     {
 358         delete_sem( p_mutex->lock );
 359     }
 360
 361     p_mutex->init = 0;
 362     return B_OK;
 363
 364 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 365     i_result = pthread_mutex_destroy( &p_mutex->mutex );
 366     if( i_result )
 367     {
 368         i_thread = CAST_PTHREAD_TO_INT(pthread_self());
 369         errno = i_result;
 370     }
 371
 372 #elif defined( HAVE_CTHREADS_H )
 373     return 0;
 374
 375 #endif
 376
 377     if( i_result )
 378     {
 379         msg_Err( p_mutex->p_this,
 380                  "thread %d: mutex_destroy failed at %s:%d (%d:%m)",
 381                  i_thread, psz_file, i_line, i_result );
 382     }
 383     return i_result;
 384 }
 385
 386 /*****************************************************************************
 387  * vlc_cond_init: initialize a condition
 388  *****************************************************************************/
 389 int __vlc_cond_init( vlc_object_t *p_this, vlc_cond_t *p_condvar )
 390 {
 391     p_condvar->p_this = p_this;
 392
 393 #if defined( PTH_INIT_IN_PTH_H )
 394     return ( pth_cond_init( &p_condvar->cond ) == FALSE );
 395
 396 #elif defined( ST_INIT_IN_ST_H )
 397     p_condvar->cond = st_cond_new();
 398     return ( p_condvar->cond == NULL ) ? errno : 0;
 399
 400 #elif defined( UNDER_CE )
 401     /* Initialize counter */
 402     p_condvar->i_waiting_threads = 0;
 403
 404     /* Create an auto-reset event. */
 405     p_condvar->event = CreateEvent( NULL,   /* no security */
 406                                     FALSE,  /* auto-reset event */
 407                                     FALSE,  /* start non-signaled */
 408                                     NULL ); /* unnamed */
 409     return !p_condvar->event;
 410
 411 #elif defined( WIN32 )
 412     /* Initialize counter */
 413     p_condvar->i_waiting_threads = 0;
 414
 415     /* Misc init */
 416     p_condvar->i_win9x_cv = i_win9x_cv;
 417     p_condvar->SignalObjectAndWait = pf_SignalObjectAndWait;
 418
 419     if( (p_condvar->SignalObjectAndWait && !b_fast_mutex)
 420         || p_condvar->i_win9x_cv == 0 )
 421     {
 422         /* Create an auto-reset event. */
 423         p_condvar->event = CreateEvent( NULL,   /* no security */
 424                                         FALSE,  /* auto-reset event */
 425                                         FALSE,  /* start non-signaled */
 426                                         NULL ); /* unnamed */
 427
 428         p_condvar->semaphore = NULL;
 429         return !p_condvar->event;
 430     }
 431     else
 432     {
 433         p_condvar->semaphore = CreateSemaphore( NULL,       /* no security */
 434                                                 0,          /* initial count */
 435                                                 0x7fffffff, /* max count */
 436                                                 NULL );     /* unnamed */
 437
 438         if( p_condvar->i_win9x_cv == 1 )
 439             /* Create a manual-reset event initially signaled. */
 440             p_condvar->event = CreateEvent( NULL, TRUE, TRUE, NULL );
 441         else
 442             /* Create a auto-reset event. */
 443             p_condvar->event = CreateEvent( NULL, FALSE, FALSE, NULL );
 444
 445         InitializeCriticalSection( &p_condvar->csection );
 446
 447         return !p_condvar->semaphore || !p_condvar->event;
 448     }
 449
 450 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 451     if( !p_condvar )
 452     {
 453         return B_BAD_VALUE;
 454     }
 455
 456     if( p_condvar->init == 9999 )
 457     {
 458         return EALREADY;
 459     }
 460
 461     p_condvar->thread = -1;
 462     p_condvar->init = 9999;
 463     return 0;
 464
 465 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 466     pthread_condattr_t attr;
 467     int ret;
 468
 469     ret = pthread_condattr_init (&attr);
 470     if (ret)
 471         return ret;
 472
 473 # if defined (_POSIX_CLOCK_SELECTION) && (_POSIX_CLOCK_SELECTION - 0 > 0)
 474     /* NOTE: This must be the same clock as the one in mtime.c */
 475     pthread_condattr_setclock (&attr, CLOCK_MONOTONIC);
 476 # endif
 477
 478     ret = pthread_cond_init (&p_condvar->cond, &attr);
 479     pthread_condattr_destroy (&attr);
 480     return ret;
 481
 482 #elif defined( HAVE_CTHREADS_H )
 483     /* condition_init() */
 484     spin_lock_init( &p_condvar->lock );
 485     cthread_queue_init( &p_condvar->queue );
 486     p_condvar->name = 0;
 487     p_condvar->implications = 0;
 488
 489     return 0;
 490
 491 #endif
 492 }
 493
 494 /*****************************************************************************
 495  * vlc_cond_destroy: destroy a condition, inner version
 496  *****************************************************************************/
 497 int __vlc_cond_destroy( const char * psz_file, int i_line, vlc_cond_t *p_condvar )
 498 {
 499     int i_result;
 500     /* In case of error : */
 501     int i_thread = -1;
 502
 503 #if defined( PTH_INIT_IN_PTH_H )
 504     return 0;
 505
 506 #elif defined( ST_INIT_IN_ST_H )
 507     i_result = st_cond_destroy( p_condvar->cond );
 508
 509 #elif defined( UNDER_CE )
 510     i_result = !CloseHandle( p_condvar->event );
 511
 512 #elif defined( WIN32 )
 513     if( !p_condvar->semaphore )
 514         i_result = !CloseHandle( p_condvar->event );
 515     else
 516         i_result = !CloseHandle( p_condvar->event )
 517           || !CloseHandle( p_condvar->semaphore );
 518
 519     if( p_condvar->semaphore != NULL )
 520         DeleteCriticalSection( &p_condvar->csection );
 521
 522 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 523     p_condvar->init = 0;
 524     return 0;
 525
 526 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 527     i_result = pthread_cond_destroy( &p_condvar->cond );
 528     if( i_result )
 529     {
 530         i_thread = CAST_PTHREAD_TO_INT(pthread_self());
 531         errno = i_result;
 532     }
 533
 534 #elif defined( HAVE_CTHREADS_H )
 535     return 0;
 536
 537 #endif
 538
 539     if( i_result )
 540     {
 541         msg_Err( p_condvar->p_this,
 542                  "thread %d: cond_destroy failed at %s:%d (%d:%m)",
 543                  i_thread, psz_file, i_line, i_result );
 544     }
 545     return i_result;
 546 }
 547
 548 /*****************************************************************************
 549  * vlc_tls_create: create a thread-local variable
 550  *****************************************************************************/
 551 int __vlc_threadvar_create( vlc_object_t *p_this, vlc_threadvar_t *p_tls )
 552 {
 553     int i_ret = -1;
 554     (void)p_this;
 555 #if defined( PTH_INIT_IN_PTH_H )
 556     i_ret = pth_key_create( &p_tls->handle, NULL );
 557 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 558     msg_Err( p_this, "TLS not implemented" );
 559     i_ret VLC_EGENERIC;
 560 #elif defined( ST_INIT_IN_ST_H )
 561     i_ret = st_key_create( &p_tls->handle, NULL );
 562 #elif defined( UNDER_CE ) || defined( WIN32 )
 563 #elif defined( WIN32 )
 564     p_tls->handle = TlsAlloc();
 565     i_ret = !( p_tls->handle == 0xFFFFFFFF );
 566
 567 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 568     i_ret =  pthread_key_create( &p_tls->handle, NULL );
 569 #elif defined( HAVE_CTHREADS_H )
 570     i_ret = cthread_keycreate( &p_tls-handle );
 571 #endif
 572     return i_ret;
 573 }
 574
 575 /*****************************************************************************
 576  * vlc_thread_create: create a thread, inner version
 577  *****************************************************************************
 578  * Note that i_priority is only taken into account on platforms supporting
 579  * userland real-time priority threads.
 580  *****************************************************************************/
 581 int __vlc_thread_create( vlc_object_t *p_this, const char * psz_file, int i_line,
 582                          const char *psz_name, void * ( *func ) ( void * ),
 583                          int i_priority, vlc_bool_t b_wait )
 584 {
 585     int i_ret;
 586     void *p_data = (void *)p_this;
 587     vlc_object_internals_t *p_priv = p_this->p_internals;
 588
 589     vlc_mutex_lock( &p_this->object_lock );
 590
 591 #if defined( PTH_INIT_IN_PTH_H )
 592     p_priv->thread_id = pth_spawn( PTH_ATTR_DEFAULT, func, p_data );
 593     i_ret = p_priv->thread_id == NULL;
 594
 595 #elif defined( ST_INIT_IN_ST_H )
 596     p_priv->thread_id = st_thread_create( func, p_data, 1, 0 );
 597     i_ret = 0;
 598
 599 #elif defined( WIN32 ) || defined( UNDER_CE )
 600     {
 601         /* When using the MSVCRT C library you have to use the _beginthreadex
 602          * function instead of CreateThread, otherwise you'll end up with
 603          * memory leaks and the signal functions not working (see Microsoft
 604          * Knowledge Base, article 104641) */
 605 #if defined( UNDER_CE )
 606         DWORD  threadId;
 607         HANDLE hThread = CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE)func,
 608                                       (LPVOID)p_data, CREATE_SUSPENDED,
 609                       &threadId );
 610 #else
 611         unsigned threadId;
 612         uintptr_t hThread = _beginthreadex( NULL, 0,
 613                         (LPTHREAD_START_ROUTINE)func,
 614                                             (void*)p_data, CREATE_SUSPENDED,
 615                         &threadId );
 616 #endif
 617         p_priv->thread_id.id = (DWORD)threadId;
 618         p_priv->thread_id.hThread = (HANDLE)hThread;
 619     ResumeThread((HANDLE)hThread);
 620     }
 621
 622     i_ret = ( p_priv->thread_id.hThread ? 0 : 1 );
 623
 624     if( i_ret && i_priority )
 625     {
 626         if( !SetThreadPriority(p_priv->thread_id.hThread, i_priority) )
 627         {
 628             msg_Warn( p_this, "couldn't set a faster priority" );
 629             i_priority = 0;
 630         }
 631     }
 632
 633 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 634     p_priv->thread_id = spawn_thread( (thread_func)func, psz_name,
 635                                       i_priority, p_data );
 636     i_ret = resume_thread( p_priv->thread_id );
 637
 638 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 639     i_ret = pthread_create( &p_priv->thread_id, NULL, func, p_data );
 640
 641 #ifndef __APPLE__
 642     if( config_GetInt( p_this, "rt-priority" ) )
 643 #endif
 644     {
 645         int i_error, i_policy;
 646         struct sched_param param;
 647
 648         memset( &param, 0, sizeof(struct sched_param) );
 649         if( config_GetType( p_this, "rt-offset" ) )
 650         {
 651             i_priority += config_GetInt( p_this, "rt-offset" );
 652         }
 653         if( i_priority <= 0 )
 654         {
 655             param.sched_priority = (-1) * i_priority;
 656             i_policy = SCHED_OTHER;
 657         }
 658         else
 659         {
 660             param.sched_priority = i_priority;
 661             i_policy = SCHED_RR;
 662         }
 663         if( (i_error = pthread_setschedparam( p_priv->thread_id,
 664                                                i_policy, &param )) )
 665         {
 666             errno = i_error;
 667             msg_Warn( p_this, "couldn't set thread priority (%s:%d): %m",
 668                       psz_file, i_line );
 669             i_priority = 0;
 670         }
 671     }
 672 #ifndef __APPLE__
 673     else
 674     {
 675         i_priority = 0;
 676     }
 677 #endif
 678
 679 #elif defined( HAVE_CTHREADS_H )
 680     p_priv->thread_id = cthread_fork( (cthread_fn_t)func, (any_t)p_data );
 681     i_ret = 0;
 682
 683 #endif
 684
 685     if( i_ret == 0 )
 686     {
 687         if( b_wait )
 688         {
 689             msg_Dbg( p_this, "waiting for thread completion" );
 690             vlc_object_wait( p_this );
 691         }
 692
 693         p_priv->b_thread = VLC_TRUE;
 694
 695 #if defined( WIN32 ) || defined( UNDER_CE )
 696         msg_Dbg( p_this, "thread %u (%s) created at priority %d (%s:%d)",
 697                  (unsigned int)p_priv->thread_id.id, psz_name,
 698          i_priority, psz_file, i_line );
 699 #else
 700         msg_Dbg( p_this, "thread %u (%s) created at priority %d (%s:%d)",
 701                  (unsigned int)p_priv->thread_id, psz_name, i_priority,
 702                  psz_file, i_line );
 703 #endif
 704
 705
 706         vlc_mutex_unlock( &p_this->object_lock );
 707     }
 708     else
 709     {
 710         errno = i_ret;
 711         msg_Err( p_this, "%s thread could not be created at %s:%d (%m)",
 712                          psz_name, psz_file, i_line );
 713         vlc_mutex_unlock( &p_this->object_lock );
 714     }
 715
 716     return i_ret;
 717 }
 718
 719 /*****************************************************************************
 720  * vlc_thread_set_priority: set the priority of the current thread when we
 721  * couldn't set it in vlc_thread_create (for instance for the main thread)
 722  *****************************************************************************/
 723 int __vlc_thread_set_priority( vlc_object_t *p_this, const char * psz_file,
 724                                int i_line, int i_priority )
 725 {
 726     vlc_object_internals_t *p_priv = p_this->p_internals;
 727 #if defined( PTH_INIT_IN_PTH_H ) || defined( ST_INIT_IN_ST_H )
 728 #elif defined( WIN32 ) || defined( UNDER_CE )
 729     if( !p_priv->thread_id.hThread )
 730         p_priv->thread_id.hThread = GetCurrentThread();
 731     if( !SetThreadPriority(p_priv->thread_id.hThread, i_priority) )
 732     {
 733         msg_Warn( p_this, "couldn't set a faster priority" );
 734         return 1;
 735     }
 736
 737 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 738 # ifndef __APPLE__
 739     if( config_GetInt( p_this, "rt-priority" ) > 0 )
 740 # endif
 741     {
 742         int i_error, i_policy;
 743         struct sched_param param;
 744
 745         memset( &param, 0, sizeof(struct sched_param) );
 746         if( config_GetType( p_this, "rt-offset" ) )
 747         {
 748             i_priority += config_GetInt( p_this, "rt-offset" );
 749         }
 750         if( i_priority <= 0 )
 751         {
 752             param.sched_priority = (-1) * i_priority;
 753             i_policy = SCHED_OTHER;
 754         }
 755         else
 756         {
 757             param.sched_priority = i_priority;
 758             i_policy = SCHED_RR;
 759         }
 760         if( !p_priv->thread_id )
 761             p_priv->thread_id = pthread_self();
 762         if( (i_error = pthread_setschedparam( p_priv->thread_id,
 763                                                i_policy, &param )) )
 764         {
 765             errno = i_error;
 766             msg_Warn( p_this, "couldn't set thread priority (%s:%d): %m",
 767                       psz_file, i_line );
 768             i_priority = 0;
 769         }
 770     }
 771 #endif
 772
 773     return 0;
 774 }
 775
 776 /*****************************************************************************
 777  * vlc_thread_ready: tell the parent thread we were successfully spawned
 778  *****************************************************************************/
 779 void __vlc_thread_ready( vlc_object_t *p_this )
 780 {
 781     vlc_object_signal( p_this );
 782 }
 783
 784 /*****************************************************************************
 785  * vlc_thread_join: wait until a thread exits, inner version
 786  *****************************************************************************/
 787 void __vlc_thread_join( vlc_object_t *p_this, const char * psz_file, int i_line )
 788 {
 789     vlc_object_internals_t *p_priv = p_this->p_internals;
 790
 791 #if defined( UNDER_CE ) || defined( WIN32 )
 792     HMODULE hmodule;
 793     BOOL (WINAPI *OurGetThreadTimes)( HANDLE, FILETIME*, FILETIME*,
 794                                       FILETIME*, FILETIME* );
 795     FILETIME create_ft, exit_ft, kernel_ft, user_ft;
 796     int64_t real_time, kernel_time, user_time;
 797     HANDLE hThread;
 798
 799     /*
 800     ** object will close its thread handle when destroyed, duplicate it here
 801     ** to be on the safe side
 802     */
 803     if( ! DuplicateHandle(GetCurrentProcess(),
 804             p_priv->thread_id.hThread,
 805             GetCurrentProcess(),
 806             &hThread,
 807             0,
 808             FALSE,
 809             DUPLICATE_SAME_ACCESS) )
 810     {
 811         msg_Err( p_this, "thread_join(%u) failed at %s:%d (%s)",
 812                          (unsigned int)p_priv->thread_id.id,
 813              psz_file, i_line, GetLastError() );
 814         p_priv->b_thread = VLC_FALSE;
 815         return;
 816     }
 817
 818     WaitForSingleObject( hThread, INFINITE );
 819
 820     msg_Dbg( p_this, "thread %u joined (%s:%d)",
 821              (unsigned int)p_priv->thread_id.id,
 822              psz_file, i_line );
 823 #if defined( UNDER_CE )
 824     hmodule = GetModuleHandle( _T("COREDLL") );
 825 #else
 826     hmodule = GetModuleHandle( _T("KERNEL32") );
 827 #endif
 828     OurGetThreadTimes = (BOOL (WINAPI*)( HANDLE, FILETIME*, FILETIME*,
 829                                          FILETIME*, FILETIME* ))
 830         GetProcAddress( hmodule, _T("GetThreadTimes") );
 831
 832     if( OurGetThreadTimes &&
 833         OurGetThreadTimes( hThread,
 834                            &create_ft, &exit_ft, &kernel_ft, &user_ft ) )
 835     {
 836         real_time =
 837           ((((int64_t)exit_ft.dwHighDateTime)<<32)| exit_ft.dwLowDateTime) -
 838           ((((int64_t)create_ft.dwHighDateTime)<<32)| create_ft.dwLowDateTime);
 839         real_time /= 10;
 840
 841         kernel_time =
 842           ((((int64_t)kernel_ft.dwHighDateTime)<<32)|
 843            kernel_ft.dwLowDateTime) / 10;
 844
 845         user_time =
 846           ((((int64_t)user_ft.dwHighDateTime)<<32)|
 847            user_ft.dwLowDateTime) / 10;
 848
 849         msg_Dbg( p_this, "thread times: "
 850                  "real "I64Fd"m%fs, kernel "I64Fd"m%fs, user "I64Fd"m%fs",
 851                  real_time/60/1000000,
 852                  (double)((real_time%(60*1000000))/1000000.0),
 853                  kernel_time/60/1000000,
 854                  (double)((kernel_time%(60*1000000))/1000000.0),
 855                  user_time/60/1000000,
 856                  (double)((user_time%(60*1000000))/1000000.0) );
 857     }
 858     CloseHandle( hThread );
 859
 860 #else /* !defined(WIN32) */
 861
 862     int i_ret = 0;
 863
 864 #if defined( PTH_INIT_IN_PTH_H )
 865     i_ret = ( pth_join( p_priv->thread_id, NULL ) == FALSE );
 866
 867 #elif defined( ST_INIT_IN_ST_H )
 868     i_ret = st_thread_join( p_priv->thread_id, NULL );
 869
 870 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 871     int32_t exit_value;
 872     i_ret = (B_OK == wait_for_thread( p_priv->thread_id, &exit_value ));
 873
 874 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 875     i_ret = pthread_join( p_priv->thread_id, NULL );
 876
 877 #elif defined( HAVE_CTHREADS_H )
 878     cthread_join( p_priv->thread_id );
 879     i_ret = 1;
 880
 881 #endif
 882
 883     if( i_ret )
 884     {
 885         errno = i_ret;
 886         msg_Err( p_this, "thread_join(%u) failed at %s:%d (%m)",
 887                          (unsigned int)p_priv->thread_id, psz_file, i_line );
 888     }
 889     else
 890     {
 891         msg_Dbg( p_this, "thread %u joined (%s:%d)",
 892                          (unsigned int)p_priv->thread_id, psz_file, i_line );
 893     }
 894
 895 #endif
 896
 897     p_priv->b_thread = VLC_FALSE;
 898 }
 899