1 /*****************************************************************************
2 * threads.c : threads implementation for the VideoLAN client
3 *****************************************************************************
4 * Copyright (C) 1999-2007 the VideoLAN team
7 * Authors: Jean-Marc Dressler <polux@via.ecp.fr>
8 * Samuel Hocevar <sam@zoy.org>
9 * Gildas Bazin <gbazin@netcourrier.com>
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.
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.
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 *****************************************************************************/
39 #define VLC_THREADS_UNINITIALIZED 0
40 #define VLC_THREADS_PENDING 1
41 #define VLC_THREADS_ERROR 2
42 #define VLC_THREADS_READY 3
44 /*****************************************************************************
45 * Global mutex for lazy initialization of the threads system
46 *****************************************************************************/
47 static volatile unsigned i_initializations = 0;
48 static volatile int i_status = VLC_THREADS_UNINITIALIZED;
49 static vlc_object_t *p_root;
51 #if defined( UNDER_CE )
52 #elif defined( WIN32 )
54 /* following is only available on NT/2000/XP and above */
55 static SIGNALOBJECTANDWAIT pf_SignalObjectAndWait = NULL;
58 ** On Windows NT/2K/XP we use a slow mutex implementation but which
59 ** allows us to correctly implement condition variables.
60 ** You can also use the faster Win9x implementation but you might
61 ** experience problems with it.
63 static vlc_bool_t b_fast_mutex = VLC_FALSE;
65 ** On Windows 9x/Me you can use a fast but incorrect condition variables
66 ** implementation (more precisely there is a possibility for a race
67 ** condition to happen).
68 ** However it is possible to use slower alternatives which are more robust.
69 ** Currently you can choose between implementation 0 (which is the
70 ** fastest but slightly incorrect), 1 (default) and 2.
72 static int i_win9x_cv = 1;
74 #elif defined( HAVE_KERNEL_SCHEDULER_H )
75 #elif defined( LIBVLC_USE_PTHREAD )
76 static pthread_mutex_t once_mutex = PTHREAD_MUTEX_INITIALIZER;
79 vlc_threadvar_t msg_context_global_key;
81 #if defined(LIBVLC_USE_PTHREAD)
82 static inline unsigned long vlc_threadid (void)
84 union { pthread_t th; unsigned long int i; } v = { };
85 v.th = pthread_self ();
90 /*****************************************************************************
91 * vlc_thread_fatal: Report an error from the threading layer
92 *****************************************************************************
93 * This is mostly meant for debugging.
94 *****************************************************************************/
95 void vlc_pthread_fatal (const char *action, int error,
96 const char *file, unsigned line)
101 fprintf (stderr, "LibVLC fatal error %s in thread %lu at %s:%u: %d\n",
102 action, vlc_threadid (), file, line, error);
105 /* Sometimes strerror_r() crashes too, so make sure we print an error
106 * message before we invoke it */
107 msg = strerror_r (error, buf, sizeof (buf));
108 fprintf (stderr, " %s\n", msg ? msg : "(null)");
115 /*****************************************************************************
116 * vlc_threads_init: initialize threads system
117 *****************************************************************************
118 * This function requires lazy initialization of a global lock in order to
119 * keep the library really thread-safe. Some architectures don't support this
120 * and thus do not guarantee the complete reentrancy.
121 *****************************************************************************/
122 int __vlc_threads_init( vlc_object_t *p_this )
124 libvlc_global_data_t *p_libvlc_global = (libvlc_global_data_t *)p_this;
125 int i_ret = VLC_SUCCESS;
127 /* If we have lazy mutex initialization, use it. Otherwise, we just
128 * hope nothing wrong happens. */
129 #if defined( UNDER_CE )
130 #elif defined( WIN32 )
131 if( IsDebuggerPresent() )
133 /* SignalObjectAndWait() is problematic under a debugger */
134 b_fast_mutex = VLC_TRUE;
137 #elif defined( HAVE_KERNEL_SCHEDULER_H )
138 #elif defined( LIBVLC_USE_PTHREAD )
139 pthread_mutex_lock( &once_mutex );
142 if( i_status == VLC_THREADS_UNINITIALIZED )
144 i_status = VLC_THREADS_PENDING;
146 /* We should be safe now. Do all the initialization stuff we want. */
147 p_libvlc_global->b_ready = VLC_FALSE;
149 #if defined( UNDER_CE )
150 /* Nothing to initialize */
152 #elif defined( WIN32 )
153 /* Dynamically get the address of SignalObjectAndWait */
154 if( GetVersion() < 0x80000000 )
158 /* We are running on NT/2K/XP, we can use SignalObjectAndWait */
159 hInstLib = LoadLibrary( "kernel32" );
162 pf_SignalObjectAndWait =
163 (SIGNALOBJECTANDWAIT)GetProcAddress( hInstLib,
164 "SignalObjectAndWait" );
168 #elif defined( HAVE_KERNEL_SCHEDULER_H )
169 #elif defined( LIBVLC_USE_PTHREAD )
172 p_root = vlc_object_create( p_libvlc_global, VLC_OBJECT_GLOBAL );
178 i_status = VLC_THREADS_ERROR;
183 i_status = VLC_THREADS_READY;
186 vlc_threadvar_create( p_root, &msg_context_global_key );
190 /* Just increment the initialization count */
194 /* If we have lazy mutex initialization support, unlock the mutex;
195 * otherwize, do a naive wait loop. */
196 #if defined( UNDER_CE )
197 while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
198 #elif defined( WIN32 )
199 while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
200 #elif defined( HAVE_KERNEL_SCHEDULER_H )
201 while( i_status == VLC_THREADS_PENDING ) msleep( THREAD_SLEEP );
202 #elif defined( LIBVLC_USE_PTHREAD )
203 pthread_mutex_unlock( &once_mutex );
206 if( i_status != VLC_THREADS_READY )
214 /*****************************************************************************
215 * vlc_threads_end: stop threads system
216 *****************************************************************************
217 * FIXME: This function is far from being threadsafe.
218 *****************************************************************************/
219 int __vlc_threads_end( vlc_object_t *p_this )
222 #if defined( UNDER_CE )
223 #elif defined( WIN32 )
224 #elif defined( HAVE_KERNEL_SCHEDULER_H )
225 #elif defined( LIBVLC_USE_PTHREAD )
226 pthread_mutex_lock( &once_mutex );
229 if( i_initializations == 0 )
233 if( i_initializations == 0 )
235 i_status = VLC_THREADS_UNINITIALIZED;
236 vlc_object_destroy( p_root );
239 #if defined( UNDER_CE )
240 #elif defined( WIN32 )
241 #elif defined( HAVE_KERNEL_SCHEDULER_H )
242 #elif defined( LIBVLC_USE_PTHREAD )
243 pthread_mutex_unlock( &once_mutex );
249 /* This is not prototyped under Linux, though it exists. */
250 int pthread_mutexattr_setkind_np( pthread_mutexattr_t *attr, int kind );
253 /*****************************************************************************
254 * vlc_mutex_init: initialize a mutex
255 *****************************************************************************/
256 int __vlc_mutex_init( vlc_object_t *p_this, vlc_mutex_t *p_mutex )
258 p_mutex->p_this = p_this;
260 #if defined( UNDER_CE )
261 InitializeCriticalSection( &p_mutex->csection );
264 #elif defined( WIN32 )
265 /* We use mutexes on WinNT/2K/XP because we can use the SignalObjectAndWait
266 * function and have a 100% correct vlc_cond_wait() implementation.
267 * As this function is not available on Win9x, we can use the faster
268 * CriticalSections */
269 if( pf_SignalObjectAndWait && !b_fast_mutex )
271 /* We are running on NT/2K/XP, we can use SignalObjectAndWait */
272 p_mutex->mutex = CreateMutex( 0, FALSE, 0 );
273 return ( p_mutex->mutex != NULL ? 0 : 1 );
277 p_mutex->mutex = NULL;
278 InitializeCriticalSection( &p_mutex->csection );
282 #elif defined( HAVE_KERNEL_SCHEDULER_H )
283 /* check the arguments and whether it's already been initialized */
284 if( p_mutex == NULL )
289 if( p_mutex->init == 9999 )
294 p_mutex->lock = create_sem( 1, "BeMutex" );
295 if( p_mutex->lock < B_NO_ERROR )
300 p_mutex->init = 9999;
303 #elif defined( LIBVLC_USE_PTHREAD )
306 /* Create error-checking mutex to detect problems more easily. */
307 pthread_mutexattr_t attr;
310 pthread_mutexattr_init( &attr );
311 # if defined(SYS_LINUX)
312 pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_ERRORCHECK_NP );
314 pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_ERRORCHECK );
317 i_result = pthread_mutex_init( &p_mutex->mutex, &attr );
318 pthread_mutexattr_destroy( &attr );
322 return pthread_mutex_init( &p_mutex->mutex, NULL );
327 /*****************************************************************************
328 * vlc_mutex_init: initialize a recursive mutex (Do not use)
329 *****************************************************************************/
330 int __vlc_mutex_init_recursive( vlc_object_t *p_this, vlc_mutex_t *p_mutex )
332 p_mutex->p_this = p_this;
335 /* Create mutex returns a recursive mutex */
336 p_mutex->mutex = CreateMutex( 0, FALSE, 0 );
337 return ( p_mutex->mutex != NULL ? 0 : 1 );
338 #elif defined( LIBVLC_USE_PTHREAD )
339 pthread_mutexattr_t attr;
342 pthread_mutexattr_init( &attr );
344 /* Create error-checking mutex to detect problems more easily. */
345 # if defined(SYS_LINUX)
346 pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_ERRORCHECK_NP );
348 pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_ERRORCHECK );
351 pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_RECURSIVE );
352 i_result = pthread_mutex_init( &p_mutex->mutex, &attr );
353 pthread_mutexattr_destroy( &attr );
356 msg_Err(p_this, "no recursive mutex found. Falling back to regular mutex.\n"
358 return __vlc_mutex_init( p_this, p_mutex );
363 /*****************************************************************************
364 * vlc_mutex_destroy: destroy a mutex, inner version
365 *****************************************************************************/
366 void __vlc_mutex_destroy( const char * psz_file, int i_line, vlc_mutex_t *p_mutex )
368 #if defined( UNDER_CE )
369 DeleteCriticalSection( &p_mutex->csection );
371 #elif defined( WIN32 )
373 CloseHandle( p_mutex->mutex );
375 DeleteCriticalSection( &p_mutex->csection );
377 #elif defined( HAVE_KERNEL_SCHEDULER_H )
378 if( p_mutex->init == 9999 )
379 delete_sem( p_mutex->lock );
383 #elif defined( LIBVLC_USE_PTHREAD )
384 int val = pthread_mutex_destroy( &p_mutex->mutex );
385 VLC_THREAD_ASSERT ("destroying mutex");
390 /*****************************************************************************
391 * vlc_cond_init: initialize a condition
392 *****************************************************************************/
393 int __vlc_cond_init( vlc_object_t *p_this, vlc_cond_t *p_condvar )
395 p_condvar->p_this = p_this;
397 #if defined( UNDER_CE )
398 /* Initialize counter */
399 p_condvar->i_waiting_threads = 0;
401 /* Create an auto-reset event. */
402 p_condvar->event = CreateEvent( NULL, /* no security */
403 FALSE, /* auto-reset event */
404 FALSE, /* start non-signaled */
405 NULL ); /* unnamed */
406 return !p_condvar->event;
408 #elif defined( WIN32 )
409 /* Initialize counter */
410 p_condvar->i_waiting_threads = 0;
413 p_condvar->i_win9x_cv = i_win9x_cv;
414 p_condvar->SignalObjectAndWait = pf_SignalObjectAndWait;
416 if( (p_condvar->SignalObjectAndWait && !b_fast_mutex)
417 || p_condvar->i_win9x_cv == 0 )
419 /* Create an auto-reset event. */
420 p_condvar->event = CreateEvent( NULL, /* no security */
421 FALSE, /* auto-reset event */
422 FALSE, /* start non-signaled */
423 NULL ); /* unnamed */
425 p_condvar->semaphore = NULL;
426 return !p_condvar->event;
430 p_condvar->semaphore = CreateSemaphore( NULL, /* no security */
431 0, /* initial count */
432 0x7fffffff, /* max count */
433 NULL ); /* unnamed */
435 if( p_condvar->i_win9x_cv == 1 )
436 /* Create a manual-reset event initially signaled. */
437 p_condvar->event = CreateEvent( NULL, TRUE, TRUE, NULL );
439 /* Create a auto-reset event. */
440 p_condvar->event = CreateEvent( NULL, FALSE, FALSE, NULL );
442 InitializeCriticalSection( &p_condvar->csection );
444 return !p_condvar->semaphore || !p_condvar->event;
447 #elif defined( HAVE_KERNEL_SCHEDULER_H )
453 if( p_condvar->init == 9999 )
458 p_condvar->thread = -1;
459 p_condvar->init = 9999;
462 #elif defined( LIBVLC_USE_PTHREAD )
463 pthread_condattr_t attr;
466 ret = pthread_condattr_init (&attr);
470 # if !defined (_POSIX_CLOCK_SELECTION)
471 /* Fairly outdated POSIX support (that was defined in 2001) */
472 # define _POSIX_CLOCK_SELECTION (-1)
474 # if (_POSIX_CLOCK_SELECTION >= 0)
475 /* NOTE: This must be the same clock as the one in mtime.c */
476 pthread_condattr_setclock (&attr, CLOCK_MONOTONIC);
479 ret = pthread_cond_init (&p_condvar->cond, &attr);
480 pthread_condattr_destroy (&attr);
486 /*****************************************************************************
487 * vlc_cond_destroy: destroy a condition, inner version
488 *****************************************************************************/
489 void __vlc_cond_destroy( const char * psz_file, int i_line, vlc_cond_t *p_condvar )
491 #if defined( UNDER_CE )
492 CloseHandle( p_condvar->event );
494 #elif defined( WIN32 )
495 if( !p_condvar->semaphore )
496 CloseHandle( p_condvar->event );
499 CloseHandle( p_condvar->event );
500 CloseHandle( p_condvar->semaphore );
503 if( p_condvar->semaphore != NULL )
504 DeleteCriticalSection( &p_condvar->csection );
506 #elif defined( HAVE_KERNEL_SCHEDULER_H )
509 #elif defined( LIBVLC_USE_PTHREAD )
510 int val = pthread_cond_destroy( &p_condvar->cond );
511 VLC_THREAD_ASSERT ("destroying condition");
516 /*****************************************************************************
517 * vlc_tls_create: create a thread-local variable
518 *****************************************************************************/
519 int __vlc_threadvar_create( vlc_object_t *p_this, vlc_threadvar_t *p_tls )
524 #if defined( HAVE_KERNEL_SCHEDULER_H )
525 msg_Err( p_this, "TLS not implemented" );
527 #elif defined( UNDER_CE ) || defined( WIN32 )
528 #elif defined( WIN32 )
529 p_tls->handle = TlsAlloc();
530 i_ret = !( p_tls->handle == 0xFFFFFFFF );
532 #elif defined( LIBVLC_USE_PTHREAD )
533 i_ret = pthread_key_create( &p_tls->handle, NULL );
538 /*****************************************************************************
539 * vlc_thread_create: create a thread, inner version
540 *****************************************************************************
541 * Note that i_priority is only taken into account on platforms supporting
542 * userland real-time priority threads.
543 *****************************************************************************/
544 int __vlc_thread_create( vlc_object_t *p_this, const char * psz_file, int i_line,
545 const char *psz_name, void * ( *func ) ( void * ),
546 int i_priority, vlc_bool_t b_wait )
549 void *p_data = (void *)p_this;
550 vlc_object_internals_t *p_priv = p_this->p_internals;
552 vlc_mutex_lock( &p_this->object_lock );
554 #if defined( WIN32 ) || defined( UNDER_CE )
556 /* When using the MSVCRT C library you have to use the _beginthreadex
557 * function instead of CreateThread, otherwise you'll end up with
558 * memory leaks and the signal functions not working (see Microsoft
559 * Knowledge Base, article 104641) */
560 #if defined( UNDER_CE )
562 HANDLE hThread = CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE)func,
563 (LPVOID)p_data, CREATE_SUSPENDED,
567 uintptr_t hThread = _beginthreadex( NULL, 0,
568 (LPTHREAD_START_ROUTINE)func,
569 (void*)p_data, CREATE_SUSPENDED,
572 p_priv->thread_id.id = (DWORD)threadId;
573 p_priv->thread_id.hThread = (HANDLE)hThread;
574 ResumeThread((HANDLE)hThread);
577 i_ret = ( p_priv->thread_id.hThread ? 0 : 1 );
579 if( !i_ret && i_priority )
581 if( !SetThreadPriority(p_priv->thread_id.hThread, i_priority) )
583 msg_Warn( p_this, "couldn't set a faster priority" );
588 #elif defined( HAVE_KERNEL_SCHEDULER_H )
589 p_priv->thread_id = spawn_thread( (thread_func)func, psz_name,
590 i_priority, p_data );
591 i_ret = resume_thread( p_priv->thread_id );
593 #elif defined( LIBVLC_USE_PTHREAD )
594 i_ret = pthread_create( &p_priv->thread_id, NULL, func, p_data );
597 if( config_GetInt( p_this, "rt-priority" ) )
600 int i_error, i_policy;
601 struct sched_param param;
603 memset( ¶m, 0, sizeof(struct sched_param) );
604 if( config_GetType( p_this, "rt-offset" ) )
606 i_priority += config_GetInt( p_this, "rt-offset" );
608 if( i_priority <= 0 )
610 param.sched_priority = (-1) * i_priority;
611 i_policy = SCHED_OTHER;
615 param.sched_priority = i_priority;
618 if( (i_error = pthread_setschedparam( p_priv->thread_id,
619 i_policy, ¶m )) )
622 msg_Warn( p_this, "couldn't set thread priority (%s:%d): %m",
640 msg_Dbg( p_this, "waiting for thread completion" );
641 vlc_object_wait( p_this );
644 p_priv->b_thread = VLC_TRUE;
646 #if defined( WIN32 ) || defined( UNDER_CE )
647 msg_Dbg( p_this, "thread %u (%s) created at priority %d (%s:%d)",
648 (unsigned int)p_priv->thread_id.id, psz_name,
649 i_priority, psz_file, i_line );
651 msg_Dbg( p_this, "thread %u (%s) created at priority %d (%s:%d)",
652 (unsigned int)p_priv->thread_id, psz_name, i_priority,
657 vlc_mutex_unlock( &p_this->object_lock );
662 msg_Err( p_this, "%s thread could not be created at %s:%d (%m)",
663 psz_name, psz_file, i_line );
664 vlc_mutex_unlock( &p_this->object_lock );
670 /*****************************************************************************
671 * vlc_thread_set_priority: set the priority of the current thread when we
672 * couldn't set it in vlc_thread_create (for instance for the main thread)
673 *****************************************************************************/
674 int __vlc_thread_set_priority( vlc_object_t *p_this, const char * psz_file,
675 int i_line, int i_priority )
677 vlc_object_internals_t *p_priv = p_this->p_internals;
678 #if defined( WIN32 ) || defined( UNDER_CE )
679 if( !p_priv->thread_id.hThread )
680 p_priv->thread_id.hThread = GetCurrentThread();
681 if( !SetThreadPriority(p_priv->thread_id.hThread, i_priority) )
683 msg_Warn( p_this, "couldn't set a faster priority" );
687 #elif defined( LIBVLC_USE_PTHREAD )
689 if( config_GetInt( p_this, "rt-priority" ) > 0 )
692 int i_error, i_policy;
693 struct sched_param param;
695 memset( ¶m, 0, sizeof(struct sched_param) );
696 if( config_GetType( p_this, "rt-offset" ) )
698 i_priority += config_GetInt( p_this, "rt-offset" );
700 if( i_priority <= 0 )
702 param.sched_priority = (-1) * i_priority;
703 i_policy = SCHED_OTHER;
707 param.sched_priority = i_priority;
710 if( !p_priv->thread_id )
711 p_priv->thread_id = pthread_self();
712 if( (i_error = pthread_setschedparam( p_priv->thread_id,
713 i_policy, ¶m )) )
716 msg_Warn( p_this, "couldn't set thread priority (%s:%d): %m",
726 /*****************************************************************************
727 * vlc_thread_ready: tell the parent thread we were successfully spawned
728 *****************************************************************************/
729 void __vlc_thread_ready( vlc_object_t *p_this )
731 vlc_object_signal( p_this );
734 /*****************************************************************************
735 * vlc_thread_join: wait until a thread exits, inner version
736 *****************************************************************************/
737 void __vlc_thread_join( vlc_object_t *p_this, const char * psz_file, int i_line )
739 vlc_object_internals_t *p_priv = p_this->p_internals;
741 #if defined( UNDER_CE ) || defined( WIN32 )
743 BOOL (WINAPI *OurGetThreadTimes)( HANDLE, FILETIME*, FILETIME*,
744 FILETIME*, FILETIME* );
745 FILETIME create_ft, exit_ft, kernel_ft, user_ft;
746 int64_t real_time, kernel_time, user_time;
750 ** object will close its thread handle when destroyed, duplicate it here
751 ** to be on the safe side
753 if( ! DuplicateHandle(GetCurrentProcess(),
754 p_priv->thread_id.hThread,
759 DUPLICATE_SAME_ACCESS) )
761 msg_Err( p_this, "thread_join(%u) failed at %s:%d (%s)",
762 (unsigned int)p_priv->thread_id.id,
763 psz_file, i_line, GetLastError() );
764 p_priv->b_thread = VLC_FALSE;
768 WaitForSingleObject( hThread, INFINITE );
770 msg_Dbg( p_this, "thread %u joined (%s:%d)",
771 (unsigned int)p_priv->thread_id.id,
773 #if defined( UNDER_CE )
774 hmodule = GetModuleHandle( _T("COREDLL") );
776 hmodule = GetModuleHandle( _T("KERNEL32") );
778 OurGetThreadTimes = (BOOL (WINAPI*)( HANDLE, FILETIME*, FILETIME*,
779 FILETIME*, FILETIME* ))
780 GetProcAddress( hmodule, _T("GetThreadTimes") );
782 if( OurGetThreadTimes &&
783 OurGetThreadTimes( hThread,
784 &create_ft, &exit_ft, &kernel_ft, &user_ft ) )
787 ((((int64_t)exit_ft.dwHighDateTime)<<32)| exit_ft.dwLowDateTime) -
788 ((((int64_t)create_ft.dwHighDateTime)<<32)| create_ft.dwLowDateTime);
792 ((((int64_t)kernel_ft.dwHighDateTime)<<32)|
793 kernel_ft.dwLowDateTime) / 10;
796 ((((int64_t)user_ft.dwHighDateTime)<<32)|
797 user_ft.dwLowDateTime) / 10;
799 msg_Dbg( p_this, "thread times: "
800 "real "I64Fd"m%fs, kernel "I64Fd"m%fs, user "I64Fd"m%fs",
801 real_time/60/1000000,
802 (double)((real_time%(60*1000000))/1000000.0),
803 kernel_time/60/1000000,
804 (double)((kernel_time%(60*1000000))/1000000.0),
805 user_time/60/1000000,
806 (double)((user_time%(60*1000000))/1000000.0) );
808 CloseHandle( hThread );
810 #else /* !defined(WIN32) */
814 #if defined( HAVE_KERNEL_SCHEDULER_H )
816 i_ret = (B_OK == wait_for_thread( p_priv->thread_id, &exit_value ));
818 #elif defined( LIBVLC_USE_PTHREAD )
819 i_ret = pthread_join( p_priv->thread_id, NULL );
826 msg_Err( p_this, "thread_join(%u) failed at %s:%d (%m)",
827 (unsigned int)p_priv->thread_id, psz_file, i_line );
831 msg_Dbg( p_this, "thread %u joined (%s:%d)",
832 (unsigned int)p_priv->thread_id, psz_file, i_line );
837 p_priv->b_thread = VLC_FALSE;