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