include/vlc_threads.h

   1 /*****************************************************************************
   2  * vlc_threads.h : threads implementation for the VideoLAN client
   3  * This header provides portable declarations for mutexes & conditions
   4  *****************************************************************************
   5  * Copyright (C) 1999, 2002 the VideoLAN team
   6  * $Id$
   7  *
   8  * Authors: Jean-Marc Dressler <polux@via.ecp.fr>
   9  *          Samuel Hocevar <sam@via.ecp.fr>
  10  *          Gildas Bazin <gbazin@netcourrier.com>
  11  *          Christophe Massiot <massiot@via.ecp.fr>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  26  *****************************************************************************/
  27
  28 #ifndef _VLC_THREADS_H_
  29 #define _VLC_THREADS_H_
  30
  31 #if defined( UNDER_CE )
  32                                                                 /* WinCE API */
  33 #elif defined( WIN32 )
  34 #   include <process.h>                                         /* Win32 API */
  35 #   include <errno.h>
  36
  37 #elif defined( SYS_BEOS )                                            /* BeOS */
  38 #   include <kernel/OS.h>
  39 #   include <kernel/scheduler.h>
  40 #   include <byteorder.h>
  41
  42 #else                                         /* pthreads (like Linux & BSD) */
  43 #   define LIBVLC_USE_PTHREAD 1
  44 #   define _APPLE_C_SOURCE    1 /* Proper pthread semantics on OSX */
  45
  46 #   include <stdlib.h> /* lldiv_t definition (only in C99) */
  47 #   include <unistd.h> /* _POSIX_SPIN_LOCKS */
  48 #   include <pthread.h>
  49     /* Needed for pthread_cond_timedwait */
  50 #   include <errno.h>
  51 #   include <time.h>
  52
  53 #endif
  54
  55 /*****************************************************************************
  56  * Constants
  57  *****************************************************************************/
  58
  59 /* Thread priorities */
  60 #ifdef __APPLE__
  61 #   define VLC_THREAD_PRIORITY_LOW      0
  62 #   define VLC_THREAD_PRIORITY_INPUT   22
  63 #   define VLC_THREAD_PRIORITY_AUDIO   22
  64 #   define VLC_THREAD_PRIORITY_VIDEO    0
  65 #   define VLC_THREAD_PRIORITY_OUTPUT  22
  66 #   define VLC_THREAD_PRIORITY_HIGHEST 22
  67
  68 #elif defined(SYS_BEOS)
  69 #   define VLC_THREAD_PRIORITY_LOW 5
  70 #   define VLC_THREAD_PRIORITY_INPUT 10
  71 #   define VLC_THREAD_PRIORITY_AUDIO 10
  72 #   define VLC_THREAD_PRIORITY_VIDEO 5
  73 #   define VLC_THREAD_PRIORITY_OUTPUT 15
  74 #   define VLC_THREAD_PRIORITY_HIGHEST 15
  75
  76 #elif defined(LIBVLC_USE_PTHREAD)
  77 #   define VLC_THREAD_PRIORITY_LOW      0
  78 #   define VLC_THREAD_PRIORITY_INPUT   10
  79 #   define VLC_THREAD_PRIORITY_AUDIO    5
  80 #   define VLC_THREAD_PRIORITY_VIDEO    0
  81 #   define VLC_THREAD_PRIORITY_OUTPUT  15
  82 #   define VLC_THREAD_PRIORITY_HIGHEST 20
  83
  84 #elif defined(WIN32) || defined(UNDER_CE)
  85 /* Define different priorities for WinNT/2K/XP and Win9x/Me */
  86 #   define VLC_THREAD_PRIORITY_LOW 0
  87 #   define VLC_THREAD_PRIORITY_INPUT \
  88         (IS_WINNT ? THREAD_PRIORITY_ABOVE_NORMAL : 0)
  89 #   define VLC_THREAD_PRIORITY_AUDIO \
  90         (IS_WINNT ? THREAD_PRIORITY_HIGHEST : 0)
  91 #   define VLC_THREAD_PRIORITY_VIDEO \
  92         (IS_WINNT ? 0 : THREAD_PRIORITY_BELOW_NORMAL )
  93 #   define VLC_THREAD_PRIORITY_OUTPUT \
  94         (IS_WINNT ? THREAD_PRIORITY_ABOVE_NORMAL : 0)
  95 #   define VLC_THREAD_PRIORITY_HIGHEST \
  96         (IS_WINNT ? THREAD_PRIORITY_TIME_CRITICAL : 0)
  97
  98 #else
  99 #   define VLC_THREAD_PRIORITY_LOW 0
 100 #   define VLC_THREAD_PRIORITY_INPUT 0
 101 #   define VLC_THREAD_PRIORITY_AUDIO 0
 102 #   define VLC_THREAD_PRIORITY_VIDEO 0
 103 #   define VLC_THREAD_PRIORITY_OUTPUT 0
 104 #   define VLC_THREAD_PRIORITY_HIGHEST 0
 105
 106 #endif
 107
 108 /*****************************************************************************
 109  * Type definitions
 110  *****************************************************************************/
 111
 112 #if defined (LIBVLC_USE_PTHREAD)
 113 typedef pthread_t       vlc_thread_t;
 114 typedef pthread_mutex_t vlc_mutex_t;
 115 typedef pthread_cond_t  vlc_cond_t;
 116 typedef pthread_key_t   vlc_threadvar_t;
 117
 118 #elif defined( WIN32 ) || defined( UNDER_CE )
 119 typedef HANDLE  vlc_thread_t;
 120
 121 typedef BOOL (WINAPI *SIGNALOBJECTANDWAIT) ( HANDLE, HANDLE, DWORD, BOOL );
 122
 123 typedef HANDLE  vlc_mutex_t;
 124
 125 typedef struct
 126 {
 127     volatile int        i_waiting_threads;
 128     HANDLE              event;
 129 } vlc_cond_t;
 130
 131 typedef DWORD   vlc_threadvar_t;
 132
 133 #elif defined( SYS_BEOS )
 134 /* This is the BeOS implementation of the vlc threads, note that the mutex is
 135  * not a real mutex and the cond_var is not like a pthread cond_var but it is
 136  * enough for what we need */
 137
 138 typedef thread_id vlc_thread_t;
 139
 140 typedef struct
 141 {
 142     int32_t         init;
 143     sem_id          lock;
 144 } vlc_mutex_t;
 145
 146 typedef struct
 147 {
 148     int32_t         init;
 149     thread_id       thread;
 150 } vlc_cond_t;
 151
 152 typedef struct
 153 {
 154 } vlc_threadvar_t;
 155
 156 #endif
 157
 158 #if defined( WIN32 ) && !defined ETIMEDOUT
 159 #  define ETIMEDOUT 10060 /* This is the value in winsock.h. */
 160 #endif
 161
 162 /*****************************************************************************
 163  * Function definitions
 164  *****************************************************************************/
 165 VLC_EXPORT( int,  vlc_mutex_init,    ( vlc_mutex_t * ) );
 166 VLC_EXPORT( int,  vlc_mutex_init_recursive, ( vlc_mutex_t * ) );
 167 VLC_EXPORT( void,  __vlc_mutex_destroy, ( const char *, int, vlc_mutex_t * ) );
 168 VLC_EXPORT( int,  __vlc_cond_init,     ( vlc_cond_t * ) );
 169 VLC_EXPORT( void,  __vlc_cond_destroy,  ( const char *, int, vlc_cond_t * ) );
 170 VLC_EXPORT( int, vlc_threadvar_create, (vlc_threadvar_t * , void (*) (void *) ) );
 171 VLC_EXPORT( void, vlc_threadvar_delete, (vlc_threadvar_t *) );
 172 VLC_EXPORT( int,  __vlc_thread_create, ( vlc_object_t *, const char *, int, const char *, void * ( * ) ( vlc_object_t * ), int, bool ) );
 173 VLC_EXPORT( int,  __vlc_thread_set_priority, ( vlc_object_t *, const char *, int, int ) );
 174 VLC_EXPORT( void, __vlc_thread_join,   ( vlc_object_t *, const char *, int ) );
 175
 176 #define vlc_thread_ready vlc_object_signal
 177
 178 /*****************************************************************************
 179  * vlc_mutex_lock: lock a mutex
 180  *****************************************************************************/
 181 #define vlc_mutex_lock( P_MUTEX )                                           \
 182     __vlc_mutex_lock( __FILE__, __LINE__, P_MUTEX )
 183
 184 VLC_EXPORT(void, vlc_pthread_fatal, (const char *action, int error, const char *file, unsigned line));
 185
 186 #if defined(LIBVLC_USE_PTHREAD)
 187 # define VLC_THREAD_ASSERT( action ) \
 188     if (val) \
 189         vlc_pthread_fatal (action, val, psz_file, i_line)
 190 #else
 191 # define VLC_THREAD_ASSERT ((void)(val))
 192 #endif
 193
 194 static inline void __vlc_mutex_lock( const char * psz_file, int i_line,
 195                                     vlc_mutex_t * p_mutex )
 196 {
 197 #if defined(LIBVLC_USE_PTHREAD)
 198 #   define vlc_assert_locked( m ) \
 199            assert (pthread_mutex_lock (m) == EDEADLK)
 200     int val = pthread_mutex_lock( p_mutex );
 201     VLC_THREAD_ASSERT ("locking mutex");
 202
 203 #elif defined( UNDER_CE )
 204     (void)psz_file; (void)i_line;
 205
 206     EnterCriticalSection( &p_mutex->csection );
 207
 208 #elif defined( WIN32 )
 209     (void)psz_file; (void)i_line;
 210
 211     WaitForSingleObject( *p_mutex, INFINITE );
 212
 213 #elif defined( SYS_BEOS )
 214     acquire_sem( p_mutex->lock );
 215
 216 #endif
 217 }
 218
 219 #ifndef vlc_assert_locked
 220 # define vlc_assert_locked( m ) (void)0
 221 #endif
 222
 223 /*****************************************************************************
 224  * vlc_mutex_unlock: unlock a mutex
 225  *****************************************************************************/
 226 #define vlc_mutex_unlock( P_MUTEX )                                         \
 227     __vlc_mutex_unlock( __FILE__, __LINE__, P_MUTEX )
 228
 229 static inline void __vlc_mutex_unlock( const char * psz_file, int i_line,
 230                                       vlc_mutex_t *p_mutex )
 231 {
 232 #if defined(LIBVLC_USE_PTHREAD)
 233     int val = pthread_mutex_unlock( p_mutex );
 234     VLC_THREAD_ASSERT ("unlocking mutex");
 235
 236 #elif defined( UNDER_CE )
 237     (void)psz_file; (void)i_line;
 238
 239     LeaveCriticalSection( &p_mutex->csection );
 240
 241 #elif defined( WIN32 )
 242     (void)psz_file; (void)i_line;
 243
 244     ReleaseMutex( *p_mutex );
 245
 246 #elif defined( SYS_BEOS )
 247     release_sem( p_mutex->lock );
 248
 249 #endif
 250 }
 251
 252 /*****************************************************************************
 253  * vlc_mutex_destroy: destroy a mutex
 254  *****************************************************************************/
 255 #define vlc_mutex_destroy( P_MUTEX )                                        \
 256     __vlc_mutex_destroy( __FILE__, __LINE__, P_MUTEX )
 257
 258 /*****************************************************************************
 259  * vlc_cond_init: initialize a condition
 260  *****************************************************************************/
 261 #define vlc_cond_init( P_THIS, P_COND )                                     \
 262     __vlc_cond_init( P_COND )
 263
 264 /*****************************************************************************
 265  * vlc_cond_signal: start a thread on condition completion
 266  *****************************************************************************/
 267 #define vlc_cond_signal( P_COND )                                           \
 268     __vlc_cond_signal( __FILE__, __LINE__, P_COND )
 269
 270 static inline void __vlc_cond_signal( const char * psz_file, int i_line,
 271                                       vlc_cond_t *p_condvar )
 272 {
 273 #if defined(LIBVLC_USE_PTHREAD)
 274     int val = pthread_cond_signal( p_condvar );
 275     VLC_THREAD_ASSERT ("signaling condition variable");
 276
 277 #elif defined( UNDER_CE ) || defined( WIN32 )
 278     (void)psz_file; (void)i_line;
 279
 280     /* Release one waiting thread if one is available. */
 281     /* For this trick to work properly, the vlc_cond_signal must be surrounded
 282      * by a mutex. This will prevent another thread from stealing the signal */
 283     /* PulseEvent() only works if none of the waiting threads is suspended.
 284      * This is particularily problematic under a debug session.
 285      * as documented in http://support.microsoft.com/kb/q173260/ */
 286     PulseEvent( p_condvar->event );
 287
 288 #elif defined( SYS_BEOS )
 289     while( p_condvar->thread != -1 )
 290     {
 291         thread_info info;
 292         if( get_thread_info(p_condvar->thread, &info) == B_BAD_VALUE )
 293             return;
 294
 295         if( info.state != B_THREAD_SUSPENDED )
 296         {
 297             /* The  waiting thread is not suspended so it could
 298              * have been interrupted beetwen the unlock and the
 299              * suspend_thread line. That is why we sleep a little
 300              * before retesting p_condver->thread. */
 301             snooze( 10000 );
 302         }
 303         else
 304         {
 305             /* Ok, we have to wake up that thread */
 306             resume_thread( p_condvar->thread );
 307         }
 308     }
 309
 310 #endif
 311 }
 312
 313 /*****************************************************************************
 314  * vlc_cond_wait: wait until condition completion
 315  *****************************************************************************/
 316 #define vlc_cond_wait( P_COND, P_MUTEX )                                     \
 317     __vlc_cond_wait( __FILE__, __LINE__, P_COND, P_MUTEX  )
 318
 319 static inline void __vlc_cond_wait( const char * psz_file, int i_line,
 320                                     vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex )
 321 {
 322 #if defined(LIBVLC_USE_PTHREAD)
 323     int val = pthread_cond_wait( p_condvar, p_mutex );
 324     VLC_THREAD_ASSERT ("waiting on condition");
 325
 326 #elif defined( UNDER_CE )
 327     p_condvar->i_waiting_threads++;
 328     LeaveCriticalSection( &p_mutex->csection );
 329     WaitForSingleObject( p_condvar->event, INFINITE );
 330     p_condvar->i_waiting_threads--;
 331
 332     /* Reacquire the mutex before returning. */
 333     vlc_mutex_lock( p_mutex );
 334
 335 #elif defined( WIN32 )
 336     (void)psz_file; (void)i_line;
 337
 338     /* Increase our wait count */
 339     p_condvar->i_waiting_threads++;
 340     SignalObjectAndWait( *p_mutex, p_condvar->event, INFINITE, FALSE );
 341     p_condvar->i_waiting_threads--;
 342
 343     /* Reacquire the mutex before returning. */
 344     vlc_mutex_lock( p_mutex );
 345
 346 #elif defined( SYS_BEOS )
 347     /* The p_condvar->thread var is initialized before the unlock because
 348      * it enables to identify when the thread is interrupted beetwen the
 349      * unlock line and the suspend_thread line */
 350     p_condvar->thread = find_thread( NULL );
 351     vlc_mutex_unlock( p_mutex );
 352     suspend_thread( p_condvar->thread );
 353     p_condvar->thread = -1;
 354
 355     vlc_mutex_lock( p_mutex );
 356
 357 #endif
 358 }
 359
 360
 361 /*****************************************************************************
 362  * vlc_cond_timedwait: wait until condition completion or expiration
 363  *****************************************************************************
 364  * Returns 0 if object signaled, an error code in case of timeout or error.
 365  *****************************************************************************/
 366 #define vlc_cond_timedwait( P_COND, P_MUTEX, DEADLINE )                      \
 367     __vlc_cond_timedwait( __FILE__, __LINE__, P_COND, P_MUTEX, DEADLINE  )
 368
 369 static inline int __vlc_cond_timedwait( const char * psz_file, int i_line,
 370                                         vlc_cond_t *p_condvar,
 371                                         vlc_mutex_t *p_mutex,
 372                                         mtime_t deadline )
 373 {
 374 #if defined(LIBVLC_USE_PTHREAD)
 375     lldiv_t d = lldiv( deadline, 1000000 );
 376     struct timespec ts = { d.quot, d.rem * 1000 };
 377
 378     int val = pthread_cond_timedwait (p_condvar, p_mutex, &ts);
 379     if (val == ETIMEDOUT)
 380         return ETIMEDOUT; /* this error is perfectly normal */
 381     VLC_THREAD_ASSERT ("timed-waiting on condition");
 382
 383 #elif defined( UNDER_CE )
 384     mtime_t delay_ms = (deadline - mdate())/1000;
 385     DWORD result;
 386     if( delay_ms < 0 )
 387         delay_ms = 0;
 388
 389     p_condvar->i_waiting_threads++;
 390     LeaveCriticalSection( &p_mutex->csection );
 391     result = WaitForSingleObject( p_condvar->event, delay_ms );
 392     p_condvar->i_waiting_threads--;
 393
 394     /* Reacquire the mutex before returning. */
 395     vlc_mutex_lock( p_mutex );
 396
 397     if(result == WAIT_TIMEOUT)
 398        return ETIMEDOUT; /* this error is perfectly normal */
 399
 400     (void)psz_file; (void)i_line;
 401
 402 #elif defined( WIN32 )
 403     mtime_t delay_ms = (deadline - mdate())/1000;
 404     DWORD result;
 405     if( delay_ms < 0 )
 406         delay_ms = 0;
 407
 408     /* Increase our wait count */
 409     p_condvar->i_waiting_threads++;
 410     result = SignalObjectAndWait( *p_mutex, p_condvar->event,
 411                                   delay_ms, FALSE );
 412     p_condvar->i_waiting_threads--;
 413
 414     /* Reacquire the mutex before returning. */
 415     vlc_mutex_lock( p_mutex );
 416     if(result == WAIT_TIMEOUT)
 417        return ETIMEDOUT; /* this error is perfectly normal */
 418
 419     (void)psz_file; (void)i_line;
 420
 421 #elif defined( SYS_BEOS )
 422 #   error Unimplemented
 423
 424 #endif
 425
 426     return 0;
 427 }
 428
 429 /*****************************************************************************
 430  * vlc_cond_destroy: destroy a condition
 431  *****************************************************************************/
 432 #define vlc_cond_destroy( P_COND )                                          \
 433     __vlc_cond_destroy( __FILE__, __LINE__, P_COND )
 434
 435 /*****************************************************************************
 436  * vlc_threadvar_set: create: set the value of a thread-local variable
 437  *****************************************************************************/
 438 static inline int vlc_threadvar_set( vlc_threadvar_t * p_tls, void *p_value )
 439 {
 440     int i_ret;
 441
 442 #if defined(LIBVLC_USE_PTHREAD)
 443     i_ret = pthread_setspecific( *p_tls, p_value );
 444
 445 #elif defined( SYS_BEOS )
 446     i_ret = EINVAL;
 447
 448 #elif defined( UNDER_CE ) || defined( WIN32 )
 449     i_ret = TlsSetValue( *p_tls, p_value ) ? EINVAL : 0;
 450
 451 #endif
 452
 453     return i_ret;
 454 }
 455
 456 /*****************************************************************************
 457  * vlc_threadvar_get: create: get the value of a thread-local variable
 458  *****************************************************************************/
 459 static inline void* vlc_threadvar_get( vlc_threadvar_t * p_tls )
 460 {
 461     void *p_ret;
 462
 463 #if defined(LIBVLC_USE_PTHREAD)
 464     p_ret = pthread_getspecific( *p_tls );
 465
 466 #elif defined( SYS_BEOS )
 467     p_ret = NULL;
 468
 469 #elif defined( UNDER_CE ) || defined( WIN32 )
 470     p_ret = TlsGetValue( *p_tls );
 471
 472 #endif
 473
 474     return p_ret;
 475 }
 476
 477 # if defined (_POSIX_SPIN_LOCKS) && ((_POSIX_SPIN_LOCKS - 0) > 0)
 478 typedef pthread_spinlock_t vlc_spinlock_t;
 479
 480 /**
 481  * Initializes a spinlock.
 482  */
 483 static inline int vlc_spin_init (vlc_spinlock_t *spin)
 484 {
 485     return pthread_spin_init (spin, PTHREAD_PROCESS_PRIVATE);
 486 }
 487
 488 /**
 489  * Acquires a spinlock.
 490  */
 491 static inline void vlc_spin_lock (vlc_spinlock_t *spin)
 492 {
 493     pthread_spin_lock (spin);
 494 }
 495
 496 /**
 497  * Releases a spinlock.
 498  */
 499 static inline void vlc_spin_unlock (vlc_spinlock_t *spin)
 500 {
 501     pthread_spin_unlock (spin);
 502 }
 503
 504 /**
 505  * Deinitializes a spinlock.
 506  */
 507 static inline void vlc_spin_destroy (vlc_spinlock_t *spin)
 508 {
 509     pthread_spin_destroy (spin);
 510 }
 511
 512 #elif defined( WIN32 )
 513
 514 typedef CRITICAL_SECTION vlc_spinlock_t;
 515
 516 /**
 517  * Initializes a spinlock.
 518  */
 519 static inline int vlc_spin_init (vlc_spinlock_t *spin)
 520 {
 521     return !InitializeCriticalSectionAndSpinCount(spin, 4000);
 522 }
 523
 524 /**
 525  * Acquires a spinlock.
 526  */
 527 static inline void vlc_spin_lock (vlc_spinlock_t *spin)
 528 {
 529     EnterCriticalSection(spin);
 530 }
 531
 532 /**
 533  * Releases a spinlock.
 534  */
 535 static inline void vlc_spin_unlock (vlc_spinlock_t *spin)
 536 {
 537     LeaveCriticalSection(spin);
 538 }
 539
 540 /**
 541  * Deinitializes a spinlock.
 542  */
 543 static inline void vlc_spin_destroy (vlc_spinlock_t *spin)
 544 {
 545     DeleteCriticalSection(spin);
 546 }
 547
 548 #else
 549
 550 /* Fallback to plain mutexes if spinlocks are not available */
 551 typedef vlc_mutex_t vlc_spinlock_t;
 552
 553 static inline int vlc_spin_init (vlc_spinlock_t *spin)
 554 {
 555     return vlc_mutex_init (spin);
 556 }
 557
 558 # define vlc_spin_lock    vlc_mutex_lock
 559 # define vlc_spin_unlock  vlc_mutex_unlock
 560 # define vlc_spin_destroy vlc_mutex_destroy
 561 #endif
 562
 563 /**
 564  * Issues a full memory barrier.
 565  */
 566 #if defined (__APPLE__)
 567 # include <libkern/OSAtomic.h> /* OSMemoryBarrier() */
 568 #endif
 569 static inline void barrier (void)
 570 {
 571 #if defined (__GNUC__) && (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)
 572     __sync_synchronize ();
 573 #elif defined(__APPLE__)
 574     OSMemoryBarrier ();
 575 #elif defined(__powerpc__)
 576     asm volatile ("sync":::"memory");
 577 #elif defined(__i386__)
 578     asm volatile ("mfence":::"memory");
 579 #elif defined (LIBVLC_USE_PTHREAD)
 580     static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
 581     pthread_mutex_lock (&lock);
 582     pthread_mutex_unlock (&lock);
 583 #else
 584 # error barrier not implemented!
 585 #endif
 586 }
 587
 588 /*****************************************************************************
 589  * vlc_thread_create: create a thread
 590  *****************************************************************************/
 591 #define vlc_thread_create( P_THIS, PSZ_NAME, FUNC, PRIORITY, WAIT )         \
 592     __vlc_thread_create( VLC_OBJECT(P_THIS), __FILE__, __LINE__, PSZ_NAME, FUNC, PRIORITY, WAIT )
 593
 594 /*****************************************************************************
 595  * vlc_thread_set_priority: set the priority of the calling thread
 596  *****************************************************************************/
 597 #define vlc_thread_set_priority( P_THIS, PRIORITY )                         \
 598     __vlc_thread_set_priority( VLC_OBJECT(P_THIS), __FILE__, __LINE__, PRIORITY )
 599
 600 /*****************************************************************************
 601  * vlc_thread_join: wait until a thread exits
 602  *****************************************************************************/
 603 #define vlc_thread_join( P_THIS )                                           \
 604     __vlc_thread_join( VLC_OBJECT(P_THIS), __FILE__, __LINE__ )
 605
 606 #endif /* !_VLC_THREADS_H */