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( UNDER_CE )
  48 #elif defined( WIN32 )
  49
  50 /* following is only available on NT/2000/XP and above */
  51 static SIGNALOBJECTANDWAIT pf_SignalObjectAndWait = NULL;
  52
  53 /*
  54 ** On Windows NT/2K/XP we use a slow mutex implementation but which
  55 ** allows us to correctly implement condition variables.
  56 ** You can also use the faster Win9x implementation but you might
  57 ** experience problems with it.
  58 */
  59 static vlc_bool_t          b_fast_mutex = VLC_FALSE;
  60 /*
  61 ** On Windows 9x/Me you can use a fast but incorrect condition variables
  62 ** implementation (more precisely there is a possibility for a race
  63 ** condition to happen).
  64 ** However it is possible to use slower alternatives which are more robust.
  65 ** Currently you can choose between implementation 0 (which is the
  66 ** fastest but slightly incorrect), 1 (default) and 2.
  67 */
  68 static int i_win9x_cv = 1;
  69
  70 #elif defined( HAVE_KERNEL_SCHEDULER_H )
  71 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
  72 static pthread_mutex_t once_mutex = PTHREAD_MUTEX_INITIALIZER;
  73 #endif
  74
  75 vlc_threadvar_t msg_context_global_key;
  76
  77 #ifndef NDEBUG
  78 /*****************************************************************************
  79  * vlc_threads_error: Report an error from the threading mecanism
  80  *****************************************************************************
  81  * This is especially useful to debug those errors, as this is a nice symbol
  82  * on which you can break.
  83  *****************************************************************************/
  84 void vlc_threads_error( vlc_object_t *p_this )
  85 {
  86      msg_Err( p_this, "Error detected. Put a breakpoint in '%s' to debug.",
  87             __func__ );
  88 }
  89 #endif
  90
  91 /*****************************************************************************
  92  * vlc_threads_init: initialize threads system
  93  *****************************************************************************
  94  * This function requires lazy initialization of a global lock in order to
  95  * keep the library really thread-safe. Some architectures don't support this
  96  * and thus do not guarantee the complete reentrancy.
  97  *****************************************************************************/
  98 int __vlc_threads_init( vlc_object_t *p_this )
  99 {
 100     libvlc_global_data_t *p_libvlc_global = (libvlc_global_data_t *)p_this;
 101     int i_ret = VLC_SUCCESS;
 102
 103     /* If we have lazy mutex initialization, use it. Otherwise, we just
 104      * hope nothing wrong happens. */
 105 #if defined( UNDER_CE )
 106 #elif defined( WIN32 )
 107     if( IsDebuggerPresent() )
 108     {
 109         /* SignalObjectAndWait() is problematic under a debugger */
 110         b_fast_mutex = VLC_TRUE;
 111         i_win9x_cv = 1;
 112     }
 113 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 114 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 115     pthread_mutex_lock( &once_mutex );
 116 #endif
 117
 118     if( i_status == VLC_THREADS_UNINITIALIZED )
 119     {
 120         i_status = VLC_THREADS_PENDING;
 121
 122         /* We should be safe now. Do all the initialization stuff we want. */
 123         p_libvlc_global->b_ready = VLC_FALSE;
 124
 125 #if defined( UNDER_CE )
 126         /* Nothing to initialize */
 127
 128 #elif defined( WIN32 )
 129         /* Dynamically get the address of SignalObjectAndWait */
 130         if( GetVersion() < 0x80000000 )
 131         {
 132             HINSTANCE hInstLib;
 133
 134             /* We are running on NT/2K/XP, we can use SignalObjectAndWait */
 135             hInstLib = LoadLibrary( "kernel32" );
 136             if( hInstLib )
 137             {
 138                 pf_SignalObjectAndWait =
 139                     (SIGNALOBJECTANDWAIT)GetProcAddress( hInstLib,
 140                                                      "SignalObjectAndWait" );
 141             }
 142         }
 143
 144 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 145 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 146 #endif
 147
 148         p_root = vlc_object_create( p_libvlc_global, VLC_OBJECT_GLOBAL );
 149         if( p_root == NULL )
 150             i_ret = VLC_ENOMEM;
 151
 152         if( i_ret )
 153         {
 154             i_status = VLC_THREADS_ERROR;
 155         }
 156         else
 157         {
 158             i_initializations++;
 159             i_status = VLC_THREADS_READY;
 160         }
 161
 162         vlc_threadvar_create( p_root, &msg_context_global_key );
 163     }
 164     else
 165     {
 166         /* Just increment the initialization count */
 167         i_initializations++;
 168     }
 169
 170     /* If we have lazy mutex initialization support, unlock the mutex;
 171      * otherwize, do a naive wait loop. */
 172 #if 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 #endif
 181
 182     if( i_status != VLC_THREADS_READY )
 183     {
 184         return VLC_ETHREAD;
 185     }
 186
 187     return i_ret;
 188 }
 189
 190 /*****************************************************************************
 191  * vlc_threads_end: stop threads system
 192  *****************************************************************************
 193  * FIXME: This function is far from being threadsafe.
 194  *****************************************************************************/
 195 int __vlc_threads_end( vlc_object_t *p_this )
 196 {
 197     (void)p_this;
 198 #if defined( UNDER_CE )
 199 #elif defined( WIN32 )
 200 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 201 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 202     pthread_mutex_lock( &once_mutex );
 203 #endif
 204
 205     if( i_initializations == 0 )
 206         return VLC_EGENERIC;
 207
 208     i_initializations--;
 209     if( i_initializations == 0 )
 210     {
 211         i_status = VLC_THREADS_UNINITIALIZED;
 212         vlc_object_destroy( p_root );
 213     }
 214
 215 #if defined( UNDER_CE )
 216 #elif defined( WIN32 )
 217 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 218 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 219     pthread_mutex_unlock( &once_mutex );
 220 #endif
 221     return VLC_SUCCESS;
 222 }
 223
 224 /*****************************************************************************
 225  * vlc_mutex_init: initialize a mutex
 226  *****************************************************************************/
 227 int __vlc_mutex_init( vlc_object_t *p_this, vlc_mutex_t *p_mutex )
 228 {
 229     assert( p_this );
 230     p_mutex->p_this = p_this;
 231
 232 #if defined( UNDER_CE )
 233     InitializeCriticalSection( &p_mutex->csection );
 234     return 0;
 235
 236 #elif defined( WIN32 )
 237     /* We use mutexes on WinNT/2K/XP because we can use the SignalObjectAndWait
 238      * function and have a 100% correct vlc_cond_wait() implementation.
 239      * As this function is not available on Win9x, we can use the faster
 240      * CriticalSections */
 241     if( pf_SignalObjectAndWait && !b_fast_mutex )
 242     {
 243         /* We are running on NT/2K/XP, we can use SignalObjectAndWait */
 244         p_mutex->mutex = CreateMutex( 0, FALSE, 0 );
 245         return ( p_mutex->mutex != NULL ? 0 : 1 );
 246     }
 247     else
 248     {
 249         p_mutex->mutex = NULL;
 250         InitializeCriticalSection( &p_mutex->csection );
 251         return 0;
 252     }
 253
 254 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 255     /* check the arguments and whether it's already been initialized */
 256     if( p_mutex == NULL )
 257     {
 258         return B_BAD_VALUE;
 259     }
 260
 261     if( p_mutex->init == 9999 )
 262     {
 263         return EALREADY;
 264     }
 265
 266     p_mutex->lock = create_sem( 1, "BeMutex" );
 267     if( p_mutex->lock < B_NO_ERROR )
 268     {
 269         return( -1 );
 270     }
 271
 272     p_mutex->init = 9999;
 273     return B_OK;
 274
 275 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 276 # if defined(DEBUG)
 277     {
 278         /* Create error-checking mutex to detect problems more easily. */
 279         pthread_mutexattr_t attr;
 280         int                 i_result;
 281
 282         pthread_mutexattr_init( &attr );
 283 #   if defined(SYS_LINUX)
 284         pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_ERRORCHECK_NP );
 285 #   else
 286         pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_ERRORCHECK );
 287 #   endif
 288
 289         i_result = pthread_mutex_init( &p_mutex->mutex, &attr );
 290         pthread_mutexattr_destroy( &attr );
 291         return( i_result );
 292     }
 293 # endif
 294     return pthread_mutex_init( &p_mutex->mutex, NULL );
 295
 296 #endif
 297 }
 298
 299 /*****************************************************************************
 300  * vlc_mutex_init: initialize a recursive mutex (Do not use)
 301  *****************************************************************************/
 302 int __vlc_mutex_init_recursive( vlc_object_t *p_this, vlc_mutex_t *p_mutex )
 303 {
 304 #if defined( WIN32 )
 305     /* Create mutex returns a recursive mutex */
 306     p_mutex->mutex = CreateMutex( 0, FALSE, 0 );
 307     return ( p_mutex->mutex != NULL ? 0 : 1 );
 308 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 309     pthread_mutexattr_t attr;
 310     int                 i_result;
 311
 312     pthread_mutexattr_init( &attr );
 313 # if defined(DEBUG)
 314     /* Create error-checking mutex to detect problems more easily. */
 315 #   if defined(SYS_LINUX)
 316     pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_ERRORCHECK_NP );
 317 #   else
 318     pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_ERRORCHECK );
 319 #   endif
 320 # endif
 321     pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_RECURSIVE );
 322     i_result = pthread_mutex_init( &p_mutex->mutex, &attr );
 323     pthread_mutexattr_destroy( &attr );
 324     return( i_result );
 325 #else
 326     msg_Err(p_this, "no recursive mutex found. Falling back to regular mutex.\n"
 327                     "Expect hangs\n")
 328     return __vlc_mutex_init( p_this, p_mutex );
 329 #endif
 330 }
 331
 332
 333 /*****************************************************************************
 334  * vlc_mutex_destroy: destroy a mutex, inner version
 335  *****************************************************************************/
 336 int __vlc_mutex_destroy( const char * psz_file, int i_line, vlc_mutex_t *p_mutex )
 337 {
 338     int i_result;
 339     /* In case of error : */
 340     int i_thread = -1;
 341
 342 #if defined( UNDER_CE )
 343     DeleteCriticalSection( &p_mutex->csection );
 344     return 0;
 345
 346 #elif defined( WIN32 )
 347     if( p_mutex->mutex )
 348     {
 349         CloseHandle( p_mutex->mutex );
 350     }
 351     else
 352     {
 353         DeleteCriticalSection( &p_mutex->csection );
 354     }
 355     return 0;
 356
 357 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 358     if( p_mutex->init == 9999 )
 359     {
 360         delete_sem( p_mutex->lock );
 361     }
 362
 363     p_mutex->init = 0;
 364     return B_OK;
 365
 366 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 367     i_result = pthread_mutex_destroy( &p_mutex->mutex );
 368     if( i_result )
 369     {
 370         i_thread = CAST_PTHREAD_TO_INT(pthread_self());
 371         errno = i_result;
 372     }
 373
 374 #endif
 375
 376     if( i_result )
 377     {
 378         msg_Err( p_mutex->p_this,
 379                  "thread %d: mutex_destroy failed at %s:%d (%d:%m)",
 380                  i_thread, psz_file, i_line, i_result );
 381         vlc_threads_error( p_mutex->p_this );
 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( 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     pthread_condattr_t attr;
 460     int ret;
 461
 462     ret = pthread_condattr_init (&attr);
 463     if (ret)
 464         return ret;
 465
 466 # if !defined (_POSIX_CLOCK_SELECTION)
 467    /* Fairly outdated POSIX support (that was defined in 2001) */
 468 #  define _POSIX_CLOCK_SELECTION (-1)
 469 # endif
 470 # if (_POSIX_CLOCK_SELECTION >= 0)
 471     /* NOTE: This must be the same clock as the one in mtime.c */
 472     pthread_condattr_setclock (&attr, CLOCK_MONOTONIC);
 473 # endif
 474
 475     ret = pthread_cond_init (&p_condvar->cond, &attr);
 476     pthread_condattr_destroy (&attr);
 477     return ret;
 478
 479 #endif
 480 }
 481
 482 /*****************************************************************************
 483  * vlc_cond_destroy: destroy a condition, inner version
 484  *****************************************************************************/
 485 int __vlc_cond_destroy( const char * psz_file, int i_line, vlc_cond_t *p_condvar )
 486 {
 487     int i_result;
 488     /* In case of error : */
 489     int i_thread = -1;
 490
 491 #if defined( UNDER_CE )
 492     i_result = !CloseHandle( p_condvar->event );
 493
 494 #elif defined( WIN32 )
 495     if( !p_condvar->semaphore )
 496         i_result = !CloseHandle( p_condvar->event );
 497     else
 498         i_result = !CloseHandle( p_condvar->event )
 499           || !CloseHandle( p_condvar->semaphore );
 500
 501     if( p_condvar->semaphore != NULL )
 502         DeleteCriticalSection( &p_condvar->csection );
 503
 504 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 505     p_condvar->init = 0;
 506     return 0;
 507
 508 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 509     i_result = pthread_cond_destroy( &p_condvar->cond );
 510     if( i_result )
 511     {
 512         i_thread = CAST_PTHREAD_TO_INT(pthread_self());
 513         errno = i_result;
 514     }
 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:%m)",
 522                  i_thread, psz_file, i_line, i_result );
 523         vlc_threads_error( p_condvar->p_this );
 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
 536 #if defined( HAVE_KERNEL_SCHEDULER_H )
 537     msg_Err( p_this, "TLS not implemented" );
 538     i_ret VLC_EGENERIC;
 539 #elif defined( UNDER_CE ) || defined( WIN32 )
 540 #elif defined( WIN32 )
 541     p_tls->handle = TlsAlloc();
 542     i_ret = !( p_tls->handle == 0xFFFFFFFF );
 543
 544 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 545     i_ret =  pthread_key_create( &p_tls->handle, NULL );
 546 #endif
 547     return i_ret;
 548 }
 549
 550 /*****************************************************************************
 551  * vlc_thread_create: create a thread, inner version
 552  *****************************************************************************
 553  * Note that i_priority is only taken into account on platforms supporting
 554  * userland real-time priority threads.
 555  *****************************************************************************/
 556 int __vlc_thread_create( vlc_object_t *p_this, const char * psz_file, int i_line,
 557                          const char *psz_name, void * ( *func ) ( void * ),
 558                          int i_priority, vlc_bool_t b_wait )
 559 {
 560     int i_ret;
 561     void *p_data = (void *)p_this;
 562     vlc_object_internals_t *p_priv = p_this->p_internals;
 563
 564     vlc_mutex_lock( &p_this->object_lock );
 565
 566 #if defined( WIN32 ) || defined( UNDER_CE )
 567     {
 568         /* When using the MSVCRT C library you have to use the _beginthreadex
 569          * function instead of CreateThread, otherwise you'll end up with
 570          * memory leaks and the signal functions not working (see Microsoft
 571          * Knowledge Base, article 104641) */
 572 #if defined( UNDER_CE )
 573         DWORD  threadId;
 574         HANDLE hThread = CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE)func,
 575                                       (LPVOID)p_data, CREATE_SUSPENDED,
 576                       &threadId );
 577 #else
 578         unsigned threadId;
 579         uintptr_t hThread = _beginthreadex( NULL, 0,
 580                         (LPTHREAD_START_ROUTINE)func,
 581                                             (void*)p_data, CREATE_SUSPENDED,
 582                         &threadId );
 583 #endif
 584         p_priv->thread_id.id = (DWORD)threadId;
 585         p_priv->thread_id.hThread = (HANDLE)hThread;
 586     ResumeThread((HANDLE)hThread);
 587     }
 588
 589     i_ret = ( p_priv->thread_id.hThread ? 0 : 1 );
 590
 591     if( i_ret && i_priority )
 592     {
 593         if( !SetThreadPriority(p_priv->thread_id.hThread, i_priority) )
 594         {
 595             msg_Warn( p_this, "couldn't set a faster priority" );
 596             i_priority = 0;
 597         }
 598     }
 599
 600 #elif defined( HAVE_KERNEL_SCHEDULER_H )
 601     p_priv->thread_id = spawn_thread( (thread_func)func, psz_name,
 602                                       i_priority, p_data );
 603     i_ret = resume_thread( p_priv->thread_id );
 604
 605 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 606     i_ret = pthread_create( &p_priv->thread_id, NULL, func, p_data );
 607
 608 #ifndef __APPLE__
 609     if( config_GetInt( p_this, "rt-priority" ) )
 610 #endif
 611     {
 612         int i_error, i_policy;
 613         struct sched_param param;
 614
 615         memset( &param, 0, sizeof(struct sched_param) );
 616         if( config_GetType( p_this, "rt-offset" ) )
 617         {
 618             i_priority += config_GetInt( p_this, "rt-offset" );
 619         }
 620         if( i_priority <= 0 )
 621         {
 622             param.sched_priority = (-1) * i_priority;
 623             i_policy = SCHED_OTHER;
 624         }
 625         else
 626         {
 627             param.sched_priority = i_priority;
 628             i_policy = SCHED_RR;
 629         }
 630         if( (i_error = pthread_setschedparam( p_priv->thread_id,
 631                                                i_policy, &param )) )
 632         {
 633             errno = i_error;
 634             msg_Warn( p_this, "couldn't set thread priority (%s:%d): %m",
 635                       psz_file, i_line );
 636             i_priority = 0;
 637         }
 638     }
 639 #ifndef __APPLE__
 640     else
 641     {
 642         i_priority = 0;
 643     }
 644 #endif
 645
 646 #endif
 647
 648     if( i_ret == 0 )
 649     {
 650         if( b_wait )
 651         {
 652             msg_Dbg( p_this, "waiting for thread completion" );
 653             vlc_object_wait( p_this );
 654         }
 655
 656         p_priv->b_thread = VLC_TRUE;
 657
 658 #if defined( WIN32 ) || defined( UNDER_CE )
 659         msg_Dbg( p_this, "thread %u (%s) created at priority %d (%s:%d)",
 660                  (unsigned int)p_priv->thread_id.id, psz_name,
 661          i_priority, psz_file, i_line );
 662 #else
 663         msg_Dbg( p_this, "thread %u (%s) created at priority %d (%s:%d)",
 664                  (unsigned int)p_priv->thread_id, psz_name, i_priority,
 665                  psz_file, i_line );
 666 #endif
 667
 668
 669         vlc_mutex_unlock( &p_this->object_lock );
 670     }
 671     else
 672     {
 673         errno = i_ret;
 674         msg_Err( p_this, "%s thread could not be created at %s:%d (%m)",
 675                          psz_name, psz_file, i_line );
 676         vlc_threads_error( p_this );
 677         vlc_mutex_unlock( &p_this->object_lock );
 678     }
 679
 680     return i_ret;
 681 }
 682
 683 /*****************************************************************************
 684  * vlc_thread_set_priority: set the priority of the current thread when we
 685  * couldn't set it in vlc_thread_create (for instance for the main thread)
 686  *****************************************************************************/
 687 int __vlc_thread_set_priority( vlc_object_t *p_this, const char * psz_file,
 688                                int i_line, int i_priority )
 689 {
 690     vlc_object_internals_t *p_priv = p_this->p_internals;
 691 #if defined( WIN32 ) || defined( UNDER_CE )
 692     if( !p_priv->thread_id.hThread )
 693         p_priv->thread_id.hThread = GetCurrentThread();
 694     if( !SetThreadPriority(p_priv->thread_id.hThread, i_priority) )
 695     {
 696         msg_Warn( p_this, "couldn't set a faster priority" );
 697         return 1;
 698     }
 699
 700 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 701 # ifndef __APPLE__
 702     if( config_GetInt( p_this, "rt-priority" ) > 0 )
 703 # endif
 704     {
 705         int i_error, i_policy;
 706         struct sched_param param;
 707
 708         memset( &param, 0, sizeof(struct sched_param) );
 709         if( config_GetType( p_this, "rt-offset" ) )
 710         {
 711             i_priority += config_GetInt( p_this, "rt-offset" );
 712         }
 713         if( i_priority <= 0 )
 714         {
 715             param.sched_priority = (-1) * i_priority;
 716             i_policy = SCHED_OTHER;
 717         }
 718         else
 719         {
 720             param.sched_priority = i_priority;
 721             i_policy = SCHED_RR;
 722         }
 723         if( !p_priv->thread_id )
 724             p_priv->thread_id = pthread_self();
 725         if( (i_error = pthread_setschedparam( p_priv->thread_id,
 726                                                i_policy, &param )) )
 727         {
 728             errno = i_error;
 729             msg_Warn( p_this, "couldn't set thread priority (%s:%d): %m",
 730                       psz_file, i_line );
 731             i_priority = 0;
 732         }
 733     }
 734 #endif
 735
 736     return 0;
 737 }
 738
 739 /*****************************************************************************
 740  * vlc_thread_ready: tell the parent thread we were successfully spawned
 741  *****************************************************************************/
 742 void __vlc_thread_ready( vlc_object_t *p_this )
 743 {
 744     vlc_object_signal( p_this );
 745 }
 746
 747 /*****************************************************************************
 748  * vlc_thread_join: wait until a thread exits, inner version
 749  *****************************************************************************/
 750 void __vlc_thread_join( vlc_object_t *p_this, const char * psz_file, int i_line )
 751 {
 752     vlc_object_internals_t *p_priv = p_this->p_internals;
 753
 754 #if defined( UNDER_CE ) || defined( WIN32 )
 755     HMODULE hmodule;
 756     BOOL (WINAPI *OurGetThreadTimes)( HANDLE, FILETIME*, FILETIME*,
 757                                       FILETIME*, FILETIME* );
 758     FILETIME create_ft, exit_ft, kernel_ft, user_ft;
 759     int64_t real_time, kernel_time, user_time;
 760     HANDLE hThread;
 761
 762     /*
 763     ** object will close its thread handle when destroyed, duplicate it here
 764     ** to be on the safe side
 765     */
 766     if( ! DuplicateHandle(GetCurrentProcess(),
 767             p_priv->thread_id.hThread,
 768             GetCurrentProcess(),
 769             &hThread,
 770             0,
 771             FALSE,
 772             DUPLICATE_SAME_ACCESS) )
 773     {
 774         msg_Err( p_this, "thread_join(%u) failed at %s:%d (%s)",
 775                          (unsigned int)p_priv->thread_id.id,
 776              psz_file, i_line, GetLastError() );
 777         vlc_threads_error( p_this );
 778         p_priv->b_thread = VLC_FALSE;
 779         return;
 780     }
 781
 782     WaitForSingleObject( hThread, INFINITE );
 783
 784     msg_Dbg( p_this, "thread %u joined (%s:%d)",
 785              (unsigned int)p_priv->thread_id.id,
 786              psz_file, i_line );
 787 #if defined( UNDER_CE )
 788     hmodule = GetModuleHandle( _T("COREDLL") );
 789 #else
 790     hmodule = GetModuleHandle( _T("KERNEL32") );
 791 #endif
 792     OurGetThreadTimes = (BOOL (WINAPI*)( HANDLE, FILETIME*, FILETIME*,
 793                                          FILETIME*, FILETIME* ))
 794         GetProcAddress( hmodule, _T("GetThreadTimes") );
 795
 796     if( OurGetThreadTimes &&
 797         OurGetThreadTimes( hThread,
 798                            &create_ft, &exit_ft, &kernel_ft, &user_ft ) )
 799     {
 800         real_time =
 801           ((((int64_t)exit_ft.dwHighDateTime)<<32)| exit_ft.dwLowDateTime) -
 802           ((((int64_t)create_ft.dwHighDateTime)<<32)| create_ft.dwLowDateTime);
 803         real_time /= 10;
 804
 805         kernel_time =
 806           ((((int64_t)kernel_ft.dwHighDateTime)<<32)|
 807            kernel_ft.dwLowDateTime) / 10;
 808
 809         user_time =
 810           ((((int64_t)user_ft.dwHighDateTime)<<32)|
 811            user_ft.dwLowDateTime) / 10;
 812
 813         msg_Dbg( p_this, "thread times: "
 814                  "real "I64Fd"m%fs, kernel "I64Fd"m%fs, user "I64Fd"m%fs",
 815                  real_time/60/1000000,
 816                  (double)((real_time%(60*1000000))/1000000.0),
 817                  kernel_time/60/1000000,
 818                  (double)((kernel_time%(60*1000000))/1000000.0),
 819                  user_time/60/1000000,
 820                  (double)((user_time%(60*1000000))/1000000.0) );
 821     }
 822     CloseHandle( hThread );
 823
 824 #else /* !defined(WIN32) */
 825
 826     int i_ret = 0;
 827
 828 #if defined( HAVE_KERNEL_SCHEDULER_H )
 829     int32_t exit_value;
 830     i_ret = (B_OK == wait_for_thread( p_priv->thread_id, &exit_value ));
 831
 832 #elif defined( PTHREAD_COND_T_IN_PTHREAD_H )
 833     i_ret = pthread_join( p_priv->thread_id, NULL );
 834
 835 #endif
 836
 837     if( i_ret )
 838     {
 839         errno = i_ret;
 840         msg_Err( p_this, "thread_join(%u) failed at %s:%d (%m)",
 841                          (unsigned int)p_priv->thread_id, psz_file, i_line );
 842         vlc_threads_error( p_this );
 843     }
 844     else
 845     {
 846         msg_Dbg( p_this, "thread %u joined (%s:%d)",
 847                          (unsigned int)p_priv->thread_id, psz_file, i_line );
 848     }
 849
 850 #endif
 851
 852     p_priv->b_thread = VLC_FALSE;
 853 }
 854