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 <stdlib.h>
  30 #include "libvlc.h"
  31
  32 #define VLC_THREADS_UNINITIALIZED  0
  33 #define VLC_THREADS_PENDING        1
  34 #define VLC_THREADS_ERROR          2
  35 #define VLC_THREADS_READY          3
  36
  37 /*****************************************************************************
  38  * Global mutex for lazy initialization of the threads system
  39  *****************************************************************************/
  40 static volatile unsigned i_initializations = 0;
  41 static volatile int i_status = VLC_THREADS_UNINITIALIZED;
  42 static vlc_object_t *p_root;
  43
  44 #if defined( PTH_INIT_IN_PTH_H )
  45 #elif defined( ST_INIT_IN_ST_H )
  46 #elif defined( UNDER_CE )
  47 #elif defined( WIN32 )
  48
  49 /* following is only available on NT/2000/XP and above */
  50 static SIGNALOBJECTANDWAIT pf_SignalObjectAndWait = NULL;
  51
  52 /*
  53 ** On Windows NT/2K/XP we use a slow mutex implementation but which
  54 ** allows us to correctly implement condition variables.
  55 ** You can also use the faster Win9x implementation but you might
  56 ** experience problems with it.
  57 */
  58 static vlc_bool_t          b_fast_mutex = VLC_FALSE;
  59 /*
  60 ** On Windows 9x/Me you can use a fast but incorrect condition variables
  61 ** implementation (more precisely there is a possibility for a race
  62 ** condition to happen).
  63 ** However it is possible to use slower alternatives which are more robust.
  64 ** Currently you can choose between implementation 0 (which is the
  65 ** fastest but slightly incorrect), 1 (default) and 2.
  66 */
  67 static int i_win9x_cv = 1;
  68
  69 #elif defined( HAVE_KERNEL_SCHEDULER_H )
  70 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
  71 static pthread_mutex_t once_mutex = PTHREAD_MUTEX_INITIALIZER;
  72 #elif defined( HAVE_CTHREADS_H )
  73 #endif
  74
  75 vlc_threadvar_t msg_context_global_key;
  76
  77 /*****************************************************************************
  78  * vlc_threads_init: initialize threads system
  79  *****************************************************************************
  80  * This function requires lazy initialization of a global lock in order to
  81  * keep the library really thread-safe. Some architectures don't support this
  82  * and thus do not guarantee the complete reentrancy.
  83  *****************************************************************************/
  84 int __vlc_threads_init( vlc_object_t *p_this )
  85 {
  86     libvlc_global_data_t *p_libvlc_global = (libvlc_global_data_t *)p_this;
  87     int i_ret = VLC_SUCCESS;
  88
  89     /* If we have lazy mutex initialization, use it. Otherwise, we just
  90      * hope nothing wrong happens. */
  91 #if defined( PTH_INIT_IN_PTH_H )
  92 #elif defined( ST_INIT_IN_ST_H )
  93 #elif defined( UNDER_CE )
  94 #elif defined( WIN32 )
  95     if( IsDebuggerPresent() )
  96     {
  97         /* SignalObjectAndWait() is problematic under a debugger */
  98         b_fast_mutex = VLC_TRUE;
  99         i_win9x_cv = 1;
 100     }
 101 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 102 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 103     pthread_mutex_lock( &once_mutex );
 104 #elif defined( HAVE_CTHREADS_H )
 105 #endif
 106
 107     if( i_status == VLC_THREADS_UNINITIALIZED )
 108     {
 109         i_status = VLC_THREADS_PENDING;
 110
 111         /* We should be safe now. Do all the initialization stuff we want. */
 112         p_libvlc_global->b_ready = VLC_FALSE;
 113
 114 #if defined( PTH_INIT_IN_PTH_H )
 115         i_ret = ( pth_init() == FALSE );
 116
 117 #elif defined( ST_INIT_IN_ST_H )
 118         i_ret = st_init();
 119
 120 #elif defined( UNDER_CE )
 121         /* Nothing to initialize */
 122
 123 #elif defined( WIN32 )
 124         /* Dynamically get the address of SignalObjectAndWait */
 125         if( GetVersion() < 0x80000000 )
 126         {
 127             HINSTANCE hInstLib;
 128
 129             /* We are running on NT/2K/XP, we can use SignalObjectAndWait */
 130             hInstLib = LoadLibrary( "kernel32" );
 131             if( hInstLib )
 132             {
 133                 pf_SignalObjectAndWait =
 134                     (SIGNALOBJECTANDWAIT)GetProcAddress( hInstLib,
 135                                                      "SignalObjectAndWait" );
 136             }
 137         }
 138
 139 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 140 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 141 #elif defined( HAVE_CTHREADS_H )
 142 #endif
 143
 144         p_root = vlc_object_create( p_libvlc_global, VLC_OBJECT_GLOBAL );
 145         if( p_root == NULL )
 146             i_ret = VLC_ENOMEM;
 147
 148         if( i_ret )
 149         {
 150             i_status = VLC_THREADS_ERROR;
 151         }
 152         else
 153         {
 154             i_initializations++;
 155             i_status = VLC_THREADS_READY;
 156         }
 157
 158         vlc_threadvar_create( p_root, &msg_context_global_key );
 159     }
 160     else
 161     {
 162         /* Just increment the initialization count */
 163         i_initializations++;
 164     }
 165
 166     /* If we have lazy mutex initialization support, unlock the mutex;
 167      * otherwize, do a naive wait loop. */
 168 #if defined( PTH_INIT_IN_PTH_H )
 169     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 170 #elif defined( ST_INIT_IN_ST_H )
 171     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 172 #elif defined( UNDER_CE )
 173     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 174 #elif defined( WIN32 )
 175     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 176 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 177     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 178 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 179     pthread_mutex_unlock( &once_mutex );
 180 #elif defined( HAVE_CTHREADS_H )
 181     while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
 182 #endif
 183
 184     if( i_status != VLC_THREADS_READY )
 185     {
 186         return VLC_ETHREAD;
 187     }
 188
 189     return i_ret;
 190 }
 191
 192 /*****************************************************************************
 193  * vlc_threads_end: stop threads system
 194  *****************************************************************************
 195  * FIXME: This function is far from being threadsafe.
 196  *****************************************************************************/
 197 int __vlc_threads_end( vlc_object_t *p_this )
 198 {
 199     (void)p_this;
 200 #if defined( PTH_INIT_IN_PTH_H )
 201 #elif defined( ST_INIT_IN_ST_H )
 202 #elif defined( UNDER_CE )
 203 #elif defined( WIN32 )
 204 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 205 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 206     pthread_mutex_lock( &once_mutex );
 207 #elif defined( HAVE_CTHREADS_H )
 208 #endif
 209
 210     if( i_initializations == 0 )
 211         return VLC_EGENERIC;
 212
 213     i_initializations--;
 214     if( i_initializations == 0 )
 215     {
 216         i_status = VLC_THREADS_UNINITIALIZED;
 217         vlc_object_destroy( p_root );
 218     }
 219
 220 #if defined( PTH_INIT_IN_PTH_H )
 221     if( i_initializations == 0 )
 222     {
 223         return ( pth_kill() == FALSE );
 224     }
 225
 226 #elif defined( ST_INIT_IN_ST_H )
 227 #elif defined( UNDER_CE )
 228 #elif defined( WIN32 )
 229 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 230 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 231     pthread_mutex_unlock( &once_mutex );
 232 #elif defined( HAVE_CTHREADS_H )
 233 #endif
 234     return VLC_SUCCESS;
 235 }
 236
 237 /*****************************************************************************
 238  * vlc_mutex_init: initialize a mutex
 239  *****************************************************************************/
 240 int __vlc_mutex_init( vlc_object_t *p_this, vlc_mutex_t *p_mutex )
 241 {
 242     p_mutex->p_this = p_this;
 243
 244 #if defined( PTH_INIT_IN_PTH_H )
 245     return ( pth_mutex_init( &p_mutex->mutex ) == FALSE );
 246
 247 #elif defined( ST_INIT_IN_ST_H )
 248     p_mutex->mutex = st_mutex_new();
 249     return ( p_mutex->mutex == NULL ) ? errno : 0;
 250
 251 #elif defined( UNDER_CE )
 252     InitializeCriticalSection( &p_mutex->csection );
 253     return 0;
 254
 255 #elif defined( WIN32 )
 256     /* We use mutexes on WinNT/2K/XP because we can use the SignalObjectAndWait
 257      * function and have a 100% correct vlc_cond_wait() implementation.
 258      * As this function is not available on Win9x, we can use the faster
 259      * CriticalSections */
 260     if( pf_SignalObjectAndWait && !b_fast_mutex )
 261     {
 262         /* We are running on NT/2K/XP, we can use SignalObjectAndWait */
 263         p_mutex->mutex = CreateMutex( 0, FALSE, 0 );
 264         return ( p_mutex->mutex != NULL ? 0 : 1 );
 265     }
 266     else
 267     {
 268         p_mutex->mutex = NULL;
 269         InitializeCriticalSection( &p_mutex->csection );
 270         return 0;
 271     }
 272
 273 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 274     /* check the arguments and whether it's already been initialized */
 275     if( p_mutex == NULL )
 276     {
 277         return B_BAD_VALUE;
 278     }
 279
 280     if( p_mutex->init == 9999 )
 281     {
 282         return EALREADY;
 283     }
 284
 285     p_mutex->lock = create_sem( 1, "BeMutex" );
 286     if( p_mutex->lock < B_NO_ERROR )
 287     {
 288         return( -1 );
 289     }
 290
 291     p_mutex->init = 9999;
 292     return B_OK;
 293
 294 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 295 #   if defined(DEBUG) && defined(SYS_LINUX)
 296     {
 297         /* Create error-checking mutex to detect problems more easily. */
 298         pthread_mutexattr_t attr;
 299         int                 i_result;
 300
 301         pthread_mutexattr_init( &attr );
 302         pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_ERRORCHECK_NP );
 303         i_result = pthread_mutex_init( &p_mutex->mutex, &attr );
 304         pthread_mutexattr_destroy( &attr );
 305         return( i_result );
 306     }
 307 #   endif
 308     return pthread_mutex_init( &p_mutex->mutex, NULL );
 309
 310 #elif defined( HAVE_CTHREADS_H )
 311     mutex_init( p_mutex );
 312     return 0;
 313
 314 #endif
 315 }
 316
 317 /*****************************************************************************
 318  * vlc_mutex_destroy: destroy a mutex, inner version
 319  *****************************************************************************/
 320 int __vlc_mutex_destroy( const char * psz_file, int i_line, vlc_mutex_t *p_mutex )
 321 {
 322     int i_result;
 323     /* In case of error : */
 324     int i_thread = -1;
 325     const char * psz_error = "";
 326
 327 #if defined( PTH_INIT_IN_PTH_H )
 328     return 0;
 329
 330 #elif defined( ST_INIT_IN_ST_H )
 331     i_result = st_mutex_destroy( p_mutex->mutex );
 332
 333 #elif defined( UNDER_CE )
 334     DeleteCriticalSection( &p_mutex->csection );
 335     return 0;
 336
 337 #elif defined( WIN32 )
 338     if( p_mutex->mutex )
 339     {
 340         CloseHandle( p_mutex->mutex );
 341     }
 342     else
 343     {
 344         DeleteCriticalSection( &p_mutex->csection );
 345     }
 346     return 0;
 347
 348 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 349     if( p_mutex->init == 9999 )
 350     {
 351         delete_sem( p_mutex->lock );
 352     }
 353
 354     p_mutex->init = 0;
 355     return B_OK;
 356
 357 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 358     i_result = pthread_mutex_destroy( &p_mutex->mutex );
 359     if( i_result )
 360     {
 361         i_thread = CAST_PTHREAD_TO_INT(pthread_self());
 362         psz_error = strerror(i_result);
 363     }
 364
 365 #elif defined( HAVE_CTHREADS_H )
 366     return 0;
 367
 368 #endif
 369
 370     if( i_result )
 371     {
 372         msg_Err( p_mutex->p_this,
 373                  "thread %d: mutex_destroy failed at %s:%d (%d:%s)",
 374                  i_thread, psz_file, i_line, i_result, psz_error );
 375     }
 376     return i_result;
 377 }
 378
 379 /*****************************************************************************
 380  * vlc_cond_init: initialize a condition
 381  *****************************************************************************/
 382 int __vlc_cond_init( vlc_object_t *p_this, vlc_cond_t *p_condvar )
 383 {
 384     p_condvar->p_this = p_this;
 385
 386 #if defined( PTH_INIT_IN_PTH_H )
 387     return ( pth_cond_init( &p_condvar->cond ) == FALSE );
 388
 389 #elif defined( ST_INIT_IN_ST_H )
 390     p_condvar->cond = st_cond_new();
 391     return ( p_condvar->cond == NULL ) ? errno : 0;
 392
 393 #elif defined( UNDER_CE )
 394     /* Initialize counter */
 395     p_condvar->i_waiting_threads = 0;
 396
 397     /* Create an auto-reset event. */
 398     p_condvar->event = CreateEvent( NULL,   /* no security */
 399                                     FALSE,  /* auto-reset event */
 400                                     FALSE,  /* start non-signaled */
 401                                     NULL ); /* unnamed */
 402     return !p_condvar->event;
 403
 404 #elif defined( WIN32 )
 405     /* Initialize counter */
 406     p_condvar->i_waiting_threads = 0;
 407
 408     /* Misc init */
 409     p_condvar->i_win9x_cv = i_win9x_cv;
 410     p_condvar->SignalObjectAndWait = pf_SignalObjectAndWait;
 411
 412     if( (p_condvar->SignalObjectAndWait && !b_fast_mutex)
 413         || p_condvar->i_win9x_cv == 0 )
 414     {
 415         /* Create an auto-reset event. */
 416         p_condvar->event = CreateEvent( NULL,   /* no security */
 417                                         FALSE,  /* auto-reset event */
 418                                         FALSE,  /* start non-signaled */
 419                                         NULL ); /* unnamed */
 420
 421         p_condvar->semaphore = NULL;
 422         return !p_condvar->event;
 423     }
 424     else
 425     {
 426         p_condvar->semaphore = CreateSemaphore( NULL,       /* no security */
 427                                                 0,          /* initial count */
 428                                                 0x7fffffff, /* max count */
 429                                                 NULL );     /* unnamed */
 430
 431         if( p_condvar->i_win9x_cv == 1 )
 432             /* Create a manual-reset event initially signaled. */
 433             p_condvar->event = CreateEvent( NULL, TRUE, TRUE, NULL );
 434         else
 435             /* Create a auto-reset event. */
 436             p_condvar->event = CreateEvent( NULL, FALSE, FALSE, NULL );
 437
 438         InitializeCriticalSection( &p_condvar->csection );
 439
 440         return !p_condvar->semaphore || !p_condvar->event;
 441     }
 442
 443 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 444     if( !p_condvar )
 445     {
 446         return B_BAD_VALUE;
 447     }
 448
 449     if( p_condvar->init == 9999 )
 450     {
 451         return EALREADY;
 452     }
 453
 454     p_condvar->thread = -1;
 455     p_condvar->init = 9999;
 456     return 0;
 457
 458 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 459     return pthread_cond_init( &p_condvar->cond, NULL );
 460
 461 #elif defined( HAVE_CTHREADS_H )
 462     /* condition_init() */
 463     spin_lock_init( &p_condvar->lock );
 464     cthread_queue_init( &p_condvar->queue );
 465     p_condvar->name = 0;
 466     p_condvar->implications = 0;
 467
 468     return 0;
 469
 470 #endif
 471 }
 472
 473 /*****************************************************************************
 474  * vlc_cond_destroy: destroy a condition, inner version
 475  *****************************************************************************/
 476 int __vlc_cond_destroy( const char * psz_file, int i_line, vlc_cond_t *p_condvar )
 477 {
 478     int i_result;
 479     /* In case of error : */
 480     int i_thread = -1;
 481     const char * psz_error = "";
 482
 483 #if defined( PTH_INIT_IN_PTH_H )
 484     return 0;
 485
 486 #elif defined( ST_INIT_IN_ST_H )
 487     i_result = st_cond_destroy( p_condvar->cond );
 488
 489 #elif defined( UNDER_CE )
 490     i_result = !CloseHandle( p_condvar->event );
 491
 492 #elif defined( WIN32 )
 493     if( !p_condvar->semaphore )
 494         i_result = !CloseHandle( p_condvar->event );
 495     else
 496         i_result = !CloseHandle( p_condvar->event )
 497           || !CloseHandle( p_condvar->semaphore );
 498
 499     if( p_condvar->semaphore != NULL )
 500                 DeleteCriticalSection( &p_condvar->csection );
 501
 502 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 503     p_condvar->init = 0;
 504     return 0;
 505
 506 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 507     i_result = pthread_cond_destroy( &p_condvar->cond );
 508     if( i_result )
 509     {
 510         i_thread = CAST_PTHREAD_TO_INT(pthread_self());
 511         psz_error = strerror(i_result);
 512     }
 513
 514 #elif defined( HAVE_CTHREADS_H )
 515     return 0;
 516
 517 #endif
 518
 519     if( i_result )
 520     {
 521         msg_Err( p_condvar->p_this,
 522                  "thread %d: cond_destroy failed at %s:%d (%d:%s)",
 523                  i_thread, psz_file, i_line, i_result, psz_error );
 524     }
 525     return i_result;
 526 }
 527
 528 /*****************************************************************************
 529  * vlc_tls_create: create a thread-local variable
 530  *****************************************************************************/
 531 int __vlc_threadvar_create( vlc_object_t *p_this, vlc_threadvar_t *p_tls )
 532 {
 533     int i_ret = -1;
 534     (void)p_this;
 535 #if defined( PTH_INIT_IN_PTH_H )
 536     i_ret = pth_key_create( &p_tls->handle, NULL );
 537 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 538     msg_Err( p_this, "TLS not implemented" );
 539     i_ret VLC_EGENERIC;
 540 #elif defined( ST_INIT_IN_ST_H )
 541     i_ret = st_key_create( &p_tls->handle, NULL );
 542 #elif defined( UNDER_CE ) || defined( WIN32 )
 543 #elif defined( WIN32 )
 544     p_tls->handle = TlsAlloc();
 545     i_ret = !( p_tls->handle == 0xFFFFFFFF );
 546
 547 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 548     i_ret =  pthread_key_create( &p_tls->handle, NULL );
 549 #elif defined( HAVE_CTHREADS_H )
 550     i_ret = cthread_keycreate( &p_tls-handle );
 551 #endif
 552     return i_ret;
 553 }
 554
 555 #if defined( WIN32 ) || defined( UNDER_CE )
 556
 557 /*
 558 ** Use a wrapper function which will make sure that
 559 ** thread handle is closed
 560 */
 561 struct _vlc_win32_init_thread_data {
 562     void * ( *func ) (void * );
 563     void *p_data;
 564 };
 565
 566 static unsigned WINAPI __vlc_win32_thread_start(void* p_data) {
 567     struct _vlc_win32_init_thread_data *p_win32data =
 568         (struct _vlc_win32_init_thread_data *)p_data;
 569     vlc_object_t *p_this = (vlc_object_t *)p_win32data->p_data;
 570     HANDLE hThread = (HANDLE)p_this->p_internals->thread_id;
 571     void *retval = (*p_win32data->func)((LPVOID)p_this);
 572     CloseHandle(hThread);
 573     return (unsigned)retval;
 574 }
 575
 576 #endif
 577
 578 /*****************************************************************************
 579  * vlc_thread_create: create a thread, inner version
 580  *****************************************************************************
 581  * Note that i_priority is only taken into account on platforms supporting
 582  * userland real-time priority threads.
 583  *****************************************************************************/
 584 int __vlc_thread_create( vlc_object_t *p_this, const char * psz_file, int i_line,
 585                          const char *psz_name, void * ( *func ) ( void * ),
 586                          int i_priority, vlc_bool_t b_wait )
 587 {
 588     int i_ret;
 589     void *p_data = (void *)p_this;
 590     vlc_object_internals_t *p_priv = p_this->p_internals;
 591 #if defined( WIN32 ) || defined( UNDER_CE )
 592     struct _vlc_win32_init_thread_data win32data = { func, p_data };
 593 #endif
 594
 595     vlc_mutex_lock( &p_this->object_lock );
 596
 597 #if defined( PTH_INIT_IN_PTH_H )
 598     p_priv->thread_id = pth_spawn( PTH_ATTR_DEFAULT, func, p_data );
 599     i_ret = p_priv->thread_id == NULL;
 600
 601 #elif defined( ST_INIT_IN_ST_H )
 602     p_priv->thread_id = st_thread_create( func, p_data, 1, 0 );
 603     i_ret = 0;
 604
 605 #elif defined( WIN32 ) || defined( UNDER_CE )
 606     {
 607         unsigned threadID;
 608         /* When using the MSVCRT C library you have to use the _beginthreadex
 609          * function instead of CreateThread, otherwise you'll end up with
 610          * memory leaks and the signal functions not working (see Microsoft
 611          * Knowledge Base, article 104641) */
 612 #if defined( UNDER_CE )
 613         HANDLE hThread = CreateThread( NULL, 0, __vlc_win32_thread_start,
 614                                       (LPVOID)&win32data, 0, &threadID );
 615 #else
 616         uintptr_t hThread = _beginthreadex( NULL, 0, __vlc_win32_thread_start,
 617                                             (void*)&win32data, 0, &threadID );
 618 #endif
 619         p_priv->thread_id = (HANDLE)hThread;
 620     }
 621
 622     if( p_priv->thread_id && i_priority )
 623     {
 624         if( !SetThreadPriority(p_priv->thread_id, i_priority) )
 625         {
 626             msg_Warn( p_this, "couldn't set a faster priority" );
 627             i_priority = 0;
 628         }
 629     }
 630
 631     i_ret = ( p_priv->thread_id ? 0 : 1 );
 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             msg_Warn( p_this, "couldn't set thread priority (%s:%d): %s",
 667                       psz_file, i_line, strerror(i_error) );
 668             i_priority = 0;
 669         }
 670     }
 671 #ifndef __APPLE__
 672     else
 673     {
 674         i_priority = 0;
 675     }
 676 #endif
 677
 678 #elif defined( HAVE_CTHREADS_H )
 679     p_priv->thread_id = cthread_fork( (cthread_fn_t)func, (any_t)p_data );
 680     i_ret = 0;
 681
 682 #endif
 683
 684     if( i_ret == 0 )
 685     {
 686         if( b_wait )
 687         {
 688             msg_Dbg( p_this, "waiting for thread completion" );
 689             vlc_cond_wait( &p_this->object_wait, &p_this->object_lock );
 690         }
 691
 692         p_priv->b_thread = VLC_TRUE;
 693
 694         msg_Dbg( p_this, "thread %u (%s) created at priority %d (%s:%d)",
 695                  (unsigned int)p_priv->thread_id, psz_name, i_priority,
 696                  psz_file, i_line );
 697
 698         vlc_mutex_unlock( &p_this->object_lock );
 699     }
 700     else
 701     {
 702         msg_Err( p_this, "%s thread could not be created at %s:%d (%s)",
 703                          psz_name, psz_file, i_line, strerror(i_ret) );
 704         vlc_mutex_unlock( &p_this->object_lock );
 705     }
 706
 707     return i_ret;
 708 }
 709
 710 /*****************************************************************************
 711  * vlc_thread_set_priority: set the priority of the current thread when we
 712  * couldn't set it in vlc_thread_create (for instance for the main thread)
 713  *****************************************************************************/
 714 int __vlc_thread_set_priority( vlc_object_t *p_this, const char * psz_file,
 715                                int i_line, int i_priority )
 716 {
 717     vlc_object_internals_t *p_priv = p_this->p_internals;
 718 #if defined( PTH_INIT_IN_PTH_H ) || defined( ST_INIT_IN_ST_H )
 719 #elif defined( WIN32 ) || defined( UNDER_CE )
 720     if( !p_priv->thread_id )
 721         p_priv->thread_id = GetCurrentThread();
 722     if( !SetThreadPriority((HANDLE)p_priv->thread_id, i_priority) )
 723     {
 724         msg_Warn( p_this, "couldn't set a faster priority" );
 725         return 1;
 726     }
 727
 728 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 729 # ifndef __APPLE__
 730     if( config_GetInt( p_this, "rt-priority" ) > 0 )
 731 # endif
 732     {
 733         int i_error, i_policy;
 734         struct sched_param param;
 735
 736         memset( &param, 0, sizeof(struct sched_param) );
 737         if( config_GetType( p_this, "rt-offset" ) )
 738         {
 739             i_priority += config_GetInt( p_this, "rt-offset" );
 740         }
 741         if( i_priority <= 0 )
 742         {
 743             param.sched_priority = (-1) * i_priority;
 744             i_policy = SCHED_OTHER;
 745         }
 746         else
 747         {
 748             param.sched_priority = i_priority;
 749             i_policy = SCHED_RR;
 750         }
 751         if( !p_priv->thread_id )
 752             p_priv->thread_id = pthread_self();
 753         if( (i_error = pthread_setschedparam( p_priv->thread_id,
 754                                                i_policy, &param )) )
 755         {
 756             msg_Warn( p_this, "couldn't set thread priority (%s:%d): %s",
 757                       psz_file, i_line, strerror(i_error) );
 758             i_priority = 0;
 759         }
 760     }
 761 #endif
 762
 763     return 0;
 764 }
 765
 766 /*****************************************************************************
 767  * vlc_thread_ready: tell the parent thread we were successfully spawned
 768  *****************************************************************************/
 769 void __vlc_thread_ready( vlc_object_t *p_this )
 770 {
 771     vlc_mutex_lock( &p_this->object_lock );
 772     vlc_cond_signal( &p_this->object_wait );
 773     vlc_mutex_unlock( &p_this->object_lock );
 774 }
 775
 776 /*****************************************************************************
 777  * vlc_thread_join: wait until a thread exits, inner version
 778  *****************************************************************************/
 779 void __vlc_thread_join( vlc_object_t *p_this, const char * psz_file, int i_line )
 780 {
 781     vlc_object_internals_t *p_priv = p_this->p_internals;
 782     int i_ret = 0;
 783
 784 #if defined( PTH_INIT_IN_PTH_H )
 785     i_ret = ( pth_join( p_priv->thread_id, NULL ) == FALSE );
 786
 787 #elif defined( ST_INIT_IN_ST_H )
 788     i_ret = st_thread_join( p_priv->thread_id, NULL );
 789
 790 #elif defined( UNDER_CE ) || defined( WIN32 )
 791     HMODULE hmodule;
 792     BOOL (WINAPI *OurGetThreadTimes)( HANDLE, FILETIME*, FILETIME*,
 793                                       FILETIME*, FILETIME* );
 794     FILETIME create_ft, exit_ft, kernel_ft, user_ft;
 795     int64_t real_time, kernel_time, user_time;
 796     HANDLE hThread;
 797
 798     /* thread will destroy its own handle on exit, duplicate it here */
 799     if( ! DuplicateHandle(GetCurrentProcess(),
 800             (HANDLE)p_priv->thread_id,
 801             GetCurrentProcess(),
 802             &hThread,
 803             0,
 804             FALSE,
 805             DUPLICATE_SAME_ACCESS) )
 806     {
 807         msg_Err( p_this, "thread_join(%u) failed at %s:%d (%s)",
 808                          (unsigned int)p_priv->thread_id, psz_file, i_line,
 809                          GetLastError() );
 810         p_priv->b_thread = VLC_FALSE;
 811         return;
 812     }
 813
 814     WaitForSingleObject( hThread, INFINITE );
 815
 816 #if defined( UNDER_CE )
 817     hmodule = GetModuleHandle( _T("COREDLL") );
 818 #else
 819     hmodule = GetModuleHandle( _T("KERNEL32") );
 820 #endif
 821     OurGetThreadTimes = (BOOL (WINAPI*)( HANDLE, FILETIME*, FILETIME*,
 822                                          FILETIME*, FILETIME* ))
 823         GetProcAddress( hmodule, _T("GetThreadTimes") );
 824
 825     if( OurGetThreadTimes &&
 826         OurGetThreadTimes( hThread,
 827                            &create_ft, &exit_ft, &kernel_ft, &user_ft ) )
 828     {
 829         real_time =
 830           ((((int64_t)exit_ft.dwHighDateTime)<<32)| exit_ft.dwLowDateTime) -
 831           ((((int64_t)create_ft.dwHighDateTime)<<32)| create_ft.dwLowDateTime);
 832         real_time /= 10;
 833
 834         kernel_time =
 835           ((((int64_t)kernel_ft.dwHighDateTime)<<32)|
 836            kernel_ft.dwLowDateTime) / 10;
 837
 838         user_time =
 839           ((((int64_t)user_ft.dwHighDateTime)<<32)|
 840            user_ft.dwLowDateTime) / 10;
 841
 842         msg_Dbg( p_this, "thread times: "
 843                  "real "I64Fd"m%fs, kernel "I64Fd"m%fs, user "I64Fd"m%fs",
 844                  real_time/60/1000000,
 845                  (double)((real_time%(60*1000000))/1000000.0),
 846                  kernel_time/60/1000000,
 847                  (double)((kernel_time%(60*1000000))/1000000.0),
 848                  user_time/60/1000000,
 849                  (double)((user_time%(60*1000000))/1000000.0) );
 850     }
 851     CloseHandle( hThread );
 852
 853 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 854     int32_t exit_value;
 855     wait_for_thread( p_priv->thread_id, &exit_value );
 856
 857 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 858     i_ret = pthread_join( p_priv->thread_id, NULL );
 859
 860 #elif defined( HAVE_CTHREADS_H )
 861     cthread_join( p_priv->thread_id );
 862     i_ret = 1;
 863
 864 #endif
 865
 866     if( i_ret )
 867     {
 868         msg_Err( p_this, "thread_join(%u) failed at %s:%d (%s)",
 869                          (unsigned int)p_priv->thread_id, psz_file, i_line,
 870                          strerror(i_ret) );
 871     }
 872     else
 873     {
 874         msg_Dbg( p_this, "thread %u joined (%s:%d)",
 875                          (unsigned int)p_priv->thread_id, psz_file, i_line );
 876     }
 877
 878     p_priv->b_thread = VLC_FALSE;
 879 }
 880