1 /*****************************************************************************
2 * threads.c : threads implementation for the VideoLAN client
3 *****************************************************************************
4 * Copyright (C) 1999-2008 the VideoLAN team
7 * Authors: Jean-Marc Dressler <polux@via.ecp.fr>
8 * Samuel Hocevar <sam@zoy.org>
9 * Gildas Bazin <gbazin@netcourrier.com>
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.
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.
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 *****************************************************************************/
32 #include <vlc_common.h>
42 #define VLC_THREADS_UNINITIALIZED 0
43 #define VLC_THREADS_PENDING 1
44 #define VLC_THREADS_ERROR 2
45 #define VLC_THREADS_READY 3
47 /*****************************************************************************
48 * Global mutex for lazy initialization of the threads system
49 *****************************************************************************/
50 static volatile unsigned i_initializations = 0;
52 #if defined( LIBVLC_USE_PTHREAD )
55 static pthread_mutex_t once_mutex = PTHREAD_MUTEX_INITIALIZER;
57 static vlc_threadvar_t cancel_key;
61 * Global process-wide VLC object.
62 * Contains inter-instance data, such as the module cache and global mutexes.
64 static libvlc_global_data_t *p_root;
66 libvlc_global_data_t *vlc_global( void )
68 assert( i_initializations > 0 );
72 #ifdef HAVE_EXECINFO_H
73 # include <execinfo.h>
77 * Print a backtrace to the standard error for debugging purpose.
79 void vlc_trace (const char *fn, const char *file, unsigned line)
81 fprintf (stderr, "at %s:%u in %s\n", file, line, fn);
82 fflush (stderr); /* needed before switch to low-level I/O */
85 int len = backtrace (stack, sizeof (stack) / sizeof (stack[0]));
86 backtrace_symbols_fd (stack, len, 2);
93 static inline unsigned long vlc_threadid (void)
95 #if defined(LIBVLC_USE_PTHREAD)
96 union { pthread_t th; unsigned long int i; } v = { };
97 v.th = pthread_self ();
100 #elif defined (WIN32)
101 return GetCurrentThreadId ();
109 /*****************************************************************************
110 * vlc_thread_fatal: Report an error from the threading layer
111 *****************************************************************************
112 * This is mostly meant for debugging.
113 *****************************************************************************/
114 void vlc_thread_fatal (const char *action, int error, const char *function,
115 const char *file, unsigned line)
117 fprintf (stderr, "LibVLC fatal error %s (%d) in thread %lu ",
118 action, error, vlc_threadid ());
119 vlc_trace (function, file, line);
121 /* Sometimes strerror_r() crashes too, so make sure we print an error
122 * message before we invoke it */
124 /* Avoid the strerror_r() prototype brain damage in glibc */
126 fprintf (stderr, " Error message: %m at:\n");
127 #elif !defined (WIN32)
131 switch (strerror_r (error, buf, sizeof (buf)))
136 case ERANGE: /* should never happen */
137 msg = "unknwon (too big to display)";
140 msg = "unknown (invalid error number)";
143 fprintf (stderr, " Error message: %s\n", msg);
151 # define VLC_THREAD_ASSERT( action ) \
152 if (val) vlc_thread_fatal (action, val, __func__, __FILE__, __LINE__)
154 # define VLC_THREAD_ASSERT( action ) ((void)val)
158 * Per-thread cancellation data
160 #ifndef LIBVLC_USE_PTHREAD_CANCEL
161 typedef struct vlc_cancel_t
163 vlc_cleanup_t *cleaners;
168 # define VLC_CANCEL_INIT { NULL, true, false }
171 /*****************************************************************************
172 * vlc_threads_init: initialize threads system
173 *****************************************************************************
174 * This function requires lazy initialization of a global lock in order to
175 * keep the library really thread-safe. Some architectures don't support this
176 * and thus do not guarantee the complete reentrancy.
177 *****************************************************************************/
178 int vlc_threads_init( void )
180 int i_ret = VLC_SUCCESS;
182 /* If we have lazy mutex initialization, use it. Otherwise, we just
183 * hope nothing wrong happens. */
184 #if defined( LIBVLC_USE_PTHREAD )
185 pthread_mutex_lock( &once_mutex );
188 if( i_initializations == 0 )
190 p_root = vlc_custom_create( (vlc_object_t *)NULL, sizeof( *p_root ),
191 VLC_OBJECT_GENERIC, "root" );
198 /* We should be safe now. Do all the initialization stuff we want. */
199 #ifndef LIBVLC_USE_PTHREAD_CANCEL
200 vlc_threadvar_create( &cancel_key, free );
206 /* If we have lazy mutex initialization support, unlock the mutex.
207 * Otherwize, we are screwed. */
208 #if defined( LIBVLC_USE_PTHREAD )
209 pthread_mutex_unlock( &once_mutex );
215 /*****************************************************************************
216 * vlc_threads_end: stop threads system
217 *****************************************************************************
218 * FIXME: This function is far from being threadsafe.
219 *****************************************************************************/
220 void vlc_threads_end( void )
222 #if defined( LIBVLC_USE_PTHREAD )
223 pthread_mutex_lock( &once_mutex );
226 assert( i_initializations > 0 );
228 if( i_initializations == 1 )
230 vlc_object_release( p_root );
231 #ifndef LIBVLC_USE_PTHREAD
232 vlc_threadvar_delete( &cancel_key );
237 #if defined( LIBVLC_USE_PTHREAD )
238 pthread_mutex_unlock( &once_mutex );
242 #if defined (__GLIBC__) && (__GLIBC_MINOR__ < 6)
243 /* This is not prototyped under glibc, though it exists. */
244 int pthread_mutexattr_setkind_np( pthread_mutexattr_t *attr, int kind );
247 /*****************************************************************************
248 * vlc_mutex_init: initialize a mutex
249 *****************************************************************************/
250 int vlc_mutex_init( vlc_mutex_t *p_mutex )
252 #if defined( LIBVLC_USE_PTHREAD )
253 pthread_mutexattr_t attr;
256 pthread_mutexattr_init( &attr );
259 /* Create error-checking mutex to detect problems more easily. */
260 # if defined (__GLIBC__) && (__GLIBC_MINOR__ < 6)
261 pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_ERRORCHECK_NP );
263 pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_ERRORCHECK );
266 i_result = pthread_mutex_init( p_mutex, &attr );
267 pthread_mutexattr_destroy( &attr );
269 #elif defined( UNDER_CE )
270 InitializeCriticalSection( &p_mutex->csection );
273 #elif defined( WIN32 )
274 *p_mutex = CreateMutex( NULL, FALSE, NULL );
275 return (*p_mutex != NULL) ? 0 : ENOMEM;
280 /*****************************************************************************
281 * vlc_mutex_init: initialize a recursive mutex (Do not use)
282 *****************************************************************************/
283 int vlc_mutex_init_recursive( vlc_mutex_t *p_mutex )
285 #if defined( LIBVLC_USE_PTHREAD )
286 pthread_mutexattr_t attr;
289 pthread_mutexattr_init( &attr );
290 # if defined (__GLIBC__) && (__GLIBC_MINOR__ < 6)
291 pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_RECURSIVE_NP );
293 pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_RECURSIVE );
295 i_result = pthread_mutex_init( p_mutex, &attr );
296 pthread_mutexattr_destroy( &attr );
298 #elif defined( WIN32 )
299 /* Create mutex returns a recursive mutex */
300 *p_mutex = CreateMutex( 0, FALSE, 0 );
301 return (*p_mutex != NULL) ? 0 : ENOMEM;
303 # error Unimplemented!
309 * Destroys a mutex. The mutex must not be locked.
311 * @param p_mutex mutex to destroy
312 * @return always succeeds
314 void vlc_mutex_destroy (vlc_mutex_t *p_mutex)
316 #if defined( LIBVLC_USE_PTHREAD )
317 int val = pthread_mutex_destroy( p_mutex );
318 VLC_THREAD_ASSERT ("destroying mutex");
320 #elif defined( UNDER_CE )
321 DeleteCriticalSection( &p_mutex->csection );
323 #elif defined( WIN32 )
324 CloseHandle( *p_mutex );
330 * Acquires a mutex. If needed, waits for any other thread to release it.
331 * Beware of deadlocks when locking multiple mutexes at the same time,
332 * or when using mutexes from callbacks.
334 * @param p_mutex mutex initialized with vlc_mutex_init() or
335 * vlc_mutex_init_recursive()
337 void vlc_mutex_lock (vlc_mutex_t *p_mutex)
339 #if defined(LIBVLC_USE_PTHREAD)
340 int val = pthread_mutex_lock( p_mutex );
341 VLC_THREAD_ASSERT ("locking mutex");
343 #elif defined( UNDER_CE )
344 EnterCriticalSection( &p_mutex->csection );
346 #elif defined( WIN32 )
347 WaitForSingleObject( *p_mutex, INFINITE );
354 * Releases a mutex (or crashes if the mutex is not locked by the caller).
355 * @param p_mutex mutex locked with vlc_mutex_lock().
357 void vlc_mutex_unlock (vlc_mutex_t *p_mutex)
359 #if defined(LIBVLC_USE_PTHREAD)
360 int val = pthread_mutex_unlock( p_mutex );
361 VLC_THREAD_ASSERT ("unlocking mutex");
363 #elif defined( UNDER_CE )
364 LeaveCriticalSection( &p_mutex->csection );
366 #elif defined( WIN32 )
367 ReleaseMutex( *p_mutex );
372 /*****************************************************************************
373 * vlc_cond_init: initialize a condition variable
374 *****************************************************************************/
375 int vlc_cond_init( vlc_cond_t *p_condvar )
377 #if defined( LIBVLC_USE_PTHREAD )
378 pthread_condattr_t attr;
381 ret = pthread_condattr_init (&attr);
385 # if !defined (_POSIX_CLOCK_SELECTION)
386 /* Fairly outdated POSIX support (that was defined in 2001) */
387 # define _POSIX_CLOCK_SELECTION (-1)
389 # if (_POSIX_CLOCK_SELECTION >= 0)
390 /* NOTE: This must be the same clock as the one in mtime.c */
391 pthread_condattr_setclock (&attr, CLOCK_MONOTONIC);
394 ret = pthread_cond_init (p_condvar, &attr);
395 pthread_condattr_destroy (&attr);
398 #elif defined( UNDER_CE ) || defined( WIN32 )
399 /* Create an auto-reset event. */
400 *p_condvar = CreateEvent( NULL, /* no security */
401 FALSE, /* auto-reset event */
402 FALSE, /* start non-signaled */
403 NULL ); /* unnamed */
404 return *p_condvar ? 0 : ENOMEM;
410 * Destroys a condition variable. No threads shall be waiting or signaling the
412 * @param p_condvar condition variable to destroy
414 void vlc_cond_destroy (vlc_cond_t *p_condvar)
416 #if defined( LIBVLC_USE_PTHREAD )
417 int val = pthread_cond_destroy( p_condvar );
418 VLC_THREAD_ASSERT ("destroying condition");
420 #elif defined( UNDER_CE ) || defined( WIN32 )
421 CloseHandle( *p_condvar );
427 * Wakes up one thread waiting on a condition variable, if any.
428 * @param p_condvar condition variable
430 void vlc_cond_signal (vlc_cond_t *p_condvar)
432 #if defined(LIBVLC_USE_PTHREAD)
433 int val = pthread_cond_signal( p_condvar );
434 VLC_THREAD_ASSERT ("signaling condition variable");
436 #elif defined( UNDER_CE ) || defined( WIN32 )
437 /* Release one waiting thread if one is available. */
438 /* For this trick to work properly, the vlc_cond_signal must be surrounded
439 * by a mutex. This will prevent another thread from stealing the signal */
440 /* PulseEvent() only works if none of the waiting threads is suspended.
441 * This is particularily problematic under a debug session.
442 * as documented in http://support.microsoft.com/kb/q173260/ */
443 PulseEvent( *p_condvar );
449 * Wakes up all threads (if any) waiting on a condition variable.
450 * @param p_cond condition variable
452 void vlc_cond_broadcast (vlc_cond_t *p_condvar)
454 #if defined (LIBVLC_USE_PTHREAD)
455 pthread_cond_broadcast (p_condvar);
457 #elif defined (WIN32)
458 SetEvent (*p_condvar);
464 * Waits for a condition variable. The calling thread will be suspended until
465 * another thread calls vlc_cond_signal() or vlc_cond_broadcast() on the same
466 * condition variable, the thread is cancelled with vlc_cancel(), or the
467 * system causes a "spurious" unsolicited wake-up.
469 * A mutex is needed to wait on a condition variable. It must <b>not</b> be
470 * a recursive mutex. Although it is possible to use the same mutex for
471 * multiple condition, it is not valid to use different mutexes for the same
472 * condition variable at the same time from different threads.
474 * In case of thread cancellation, the mutex is always locked before
475 * cancellation proceeds.
477 * The canonical way to use a condition variable to wait for event foobar is:
479 vlc_mutex_lock (&lock);
480 mutex_cleanup_push (&lock); // release the mutex in case of cancellation
483 vlc_cond_wait (&wait, &lock);
485 --- foobar is now true, do something about it here --
487 vlc_cleanup_run (); // release the mutex
490 * @param p_condvar condition variable to wait on
491 * @param p_mutex mutex which is unlocked while waiting,
492 * then locked again when waking up.
493 * @param deadline <b>absolute</b> timeout
495 * @return 0 if the condition was signaled, an error code in case of timeout.
497 void vlc_cond_wait (vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex)
499 #if defined(LIBVLC_USE_PTHREAD)
500 int val = pthread_cond_wait( p_condvar, p_mutex );
501 VLC_THREAD_ASSERT ("waiting on condition");
503 #elif defined( UNDER_CE )
504 LeaveCriticalSection( &p_mutex->csection );
505 WaitForSingleObject( *p_condvar, INFINITE );
507 /* Reacquire the mutex before returning. */
508 vlc_mutex_lock( p_mutex );
510 #elif defined( WIN32 )
513 while (SignalObjectAndWait (*p_mutex, *p_condvar, INFINITE, TRUE)
514 == WAIT_IO_COMPLETION);
516 /* Reacquire the mutex before returning. */
517 vlc_mutex_lock( p_mutex );
523 * Waits for a condition variable up to a certain date.
524 * This works like vlc_cond_wait(), except for the additional timeout.
526 * @param p_condvar condition variable to wait on
527 * @param p_mutex mutex which is unlocked while waiting,
528 * then locked again when waking up.
529 * @param deadline <b>absolute</b> timeout
531 * @return 0 if the condition was signaled, an error code in case of timeout.
533 int vlc_cond_timedwait (vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex,
536 #if defined(LIBVLC_USE_PTHREAD)
537 lldiv_t d = lldiv( deadline, CLOCK_FREQ );
538 struct timespec ts = { d.quot, d.rem * (1000000000 / CLOCK_FREQ) };
540 int val = pthread_cond_timedwait (p_condvar, p_mutex, &ts);
541 if (val != ETIMEDOUT)
542 VLC_THREAD_ASSERT ("timed-waiting on condition");
545 #elif defined( UNDER_CE )
546 mtime_t delay_ms = (deadline - mdate()) / (CLOCK_FREQ / 1000);
551 LeaveCriticalSection( &p_mutex->csection );
552 result = WaitForSingleObject( *p_condvar, delay_ms );
554 /* Reacquire the mutex before returning. */
555 vlc_mutex_lock( p_mutex );
557 return (result == WAIT_TIMEOUT) ? ETIMEDOUT : 0;
559 #elif defined( WIN32 )
566 mtime_t total = (deadline - mdate ())/1000;
570 DWORD delay = (total > 0x7fffffff) ? 0x7fffffff : total;
571 result = SignalObjectAndWait (*p_mutex, *p_condvar, delay, TRUE);
573 while (result == WAIT_IO_COMPLETION);
575 /* Reacquire the mutex before return/cancel. */
576 vlc_mutex_lock (p_mutex);
577 return (result == WAIT_OBJECT_0) ? 0 : ETIMEDOUT;
582 /*****************************************************************************
583 * vlc_tls_create: create a thread-local variable
584 *****************************************************************************/
585 int vlc_threadvar_create( vlc_threadvar_t *p_tls, void (*destr) (void *) )
589 #if defined( LIBVLC_USE_PTHREAD )
590 i_ret = pthread_key_create( p_tls, destr );
591 #elif defined( UNDER_CE )
593 #elif defined( WIN32 )
594 /* FIXME: remember/use the destr() callback and stop leaking whatever */
596 i_ret = (*p_tls == TLS_OUT_OF_INDEXES) ? EAGAIN : 0;
598 # error Unimplemented!
603 void vlc_threadvar_delete (vlc_threadvar_t *p_tls)
605 #if defined( LIBVLC_USE_PTHREAD )
606 pthread_key_delete (*p_tls);
607 #elif defined( UNDER_CE )
608 #elif defined( WIN32 )
611 # error Unimplemented!
615 #if defined (LIBVLC_USE_PTHREAD)
616 #elif defined (WIN32)
617 static unsigned __stdcall vlc_entry (void *data)
619 vlc_cancel_t cancel_data = VLC_CANCEL_INIT;
620 vlc_thread_t self = data;
622 vlc_threadvar_set (&cancel_key, &cancel_data);
623 self->data = self->entry (self->data);
629 * Creates and starts new thread.
631 * @param p_handle [OUT] pointer to write the handle of the created thread to
632 * @param entry entry point for the thread
633 * @param data data parameter given to the entry point
634 * @param priority thread priority value
635 * @return 0 on success, a standard error code on error.
637 int vlc_clone (vlc_thread_t *p_handle, void * (*entry) (void *), void *data,
642 #if defined( LIBVLC_USE_PTHREAD )
644 pthread_attr_init (&attr);
646 /* Block the signals that signals interface plugin handles.
647 * If the LibVLC caller wants to handle some signals by itself, it should
648 * block these before whenever invoking LibVLC. And it must obviously not
649 * start the VLC signals interface plugin.
651 * LibVLC will normally ignore any interruption caused by an asynchronous
652 * signal during a system call. But there may well be some buggy cases
653 * where it fails to handle EINTR (bug reports welcome). Some underlying
654 * libraries might also not handle EINTR properly.
660 sigdelset (&set, SIGHUP);
661 sigaddset (&set, SIGINT);
662 sigaddset (&set, SIGQUIT);
663 sigaddset (&set, SIGTERM);
665 sigaddset (&set, SIGPIPE); /* We don't want this one, really! */
666 pthread_sigmask (SIG_BLOCK, &set, &oldset);
669 struct sched_param sp = { .sched_priority = priority, };
672 if (sp.sched_priority <= 0)
673 sp.sched_priority += sched_get_priority_max (policy = SCHED_OTHER);
675 sp.sched_priority += sched_get_priority_min (policy = SCHED_RR);
677 pthread_attr_setschedpolicy (&attr, policy);
678 pthread_attr_setschedparam (&attr, &sp);
681 ret = pthread_create (p_handle, &attr, entry, data);
682 pthread_sigmask (SIG_SETMASK, &oldset, NULL);
683 pthread_attr_destroy (&attr);
685 #elif defined( WIN32 ) || defined( UNDER_CE )
686 /* When using the MSVCRT C library you have to use the _beginthreadex
687 * function instead of CreateThread, otherwise you'll end up with
688 * memory leaks and the signal functions not working (see Microsoft
689 * Knowledge Base, article 104641) */
691 vlc_thread_t th = malloc (sizeof (*th));
698 #if defined( UNDER_CE )
699 hThread = CreateThread (NULL, 0, vlc_entry, th, CREATE_SUSPENDED, NULL);
701 hThread = (HANDLE)(uintptr_t)
702 _beginthreadex (NULL, 0, vlc_entry, th, CREATE_SUSPENDED, NULL);
707 /* Thread closes the handle when exiting, duplicate it here
708 * to be on the safe side when joining. */
709 if (!DuplicateHandle (GetCurrentProcess (), hThread,
710 GetCurrentProcess (), &th->handle, 0, FALSE,
711 DUPLICATE_SAME_ACCESS))
713 CloseHandle (hThread);
718 ResumeThread (hThread);
720 SetThreadPriority (hThread, priority);
736 /* APC procedure for thread cancellation */
737 static void CALLBACK vlc_cancel_self (ULONG_PTR dummy)
740 vlc_control_cancel (VLC_DO_CANCEL);
745 * Marks a thread as cancelled. Next time the target thread reaches a
746 * cancellation point (while not having disabled cancellation), it will
747 * run its cancellation cleanup handler, the thread variable destructors, and
748 * terminate. vlc_join() must be used afterward regardless of a thread being
751 void vlc_cancel (vlc_thread_t thread_id)
753 #if defined (LIBVLC_USE_PTHREAD_CANCEL)
754 pthread_cancel (thread_id);
755 #elif defined (WIN32)
756 QueueUserAPC (vlc_cancel_self, thread_id->handle, 0);
758 # warning vlc_cancel is not implemented!
763 * Waits for a thread to complete (if needed), and destroys it.
764 * This is a cancellation point; in case of cancellation, the join does _not_
767 * @param handle thread handle
768 * @param p_result [OUT] pointer to write the thread return value or NULL
769 * @return 0 on success, a standard error code otherwise.
771 void vlc_join (vlc_thread_t handle, void **result)
773 #if defined( LIBVLC_USE_PTHREAD )
774 int val = pthread_join (handle, result);
776 vlc_thread_fatal ("joining thread", val, __func__, __FILE__, __LINE__);
778 #elif defined( UNDER_CE ) || defined( WIN32 )
781 while (WaitForSingleObjectEx (handle->handle, INFINITE, TRUE)
782 == WAIT_IO_COMPLETION);
784 CloseHandle (handle->handle);
786 *result = handle->data;
793 struct vlc_thread_boot
795 void * (*entry) (vlc_object_t *);
796 vlc_object_t *object;
799 static void *thread_entry (void *data)
801 vlc_object_t *obj = ((struct vlc_thread_boot *)data)->object;
802 void *(*func) (vlc_object_t *) = ((struct vlc_thread_boot *)data)->entry;
805 msg_Dbg (obj, "thread started");
807 msg_Dbg (obj, "thread ended");
812 /*****************************************************************************
813 * vlc_thread_create: create a thread, inner version
814 *****************************************************************************
815 * Note that i_priority is only taken into account on platforms supporting
816 * userland real-time priority threads.
817 *****************************************************************************/
818 int __vlc_thread_create( vlc_object_t *p_this, const char * psz_file, int i_line,
819 const char *psz_name, void * ( *func ) ( vlc_object_t * ),
820 int i_priority, bool b_wait )
823 vlc_object_internals_t *p_priv = vlc_internals( p_this );
825 struct vlc_thread_boot *boot = malloc (sizeof (*boot));
829 boot->object = p_this;
831 vlc_object_lock( p_this );
833 /* Make sure we don't re-create a thread if the object has already one */
834 assert( !p_priv->b_thread );
836 #if defined( LIBVLC_USE_PTHREAD )
838 if( config_GetInt( p_this, "rt-priority" ) > 0 )
841 /* Hack to avoid error msg */
842 if( config_GetType( p_this, "rt-offset" ) )
843 i_priority += config_GetInt( p_this, "rt-offset" );
847 i_ret = vlc_clone( &p_priv->thread_id, thread_entry, boot, i_priority );
852 msg_Dbg( p_this, "waiting for thread initialization" );
853 vlc_object_wait( p_this );
856 p_priv->b_thread = true;
857 msg_Dbg( p_this, "thread %lu (%s) created at priority %d (%s:%d)",
858 (unsigned long)p_priv->thread_id, psz_name, i_priority,
864 msg_Err( p_this, "%s thread could not be created at %s:%d (%m)",
865 psz_name, psz_file, i_line );
868 vlc_object_unlock( p_this );
872 /*****************************************************************************
873 * vlc_thread_set_priority: set the priority of the current thread when we
874 * couldn't set it in vlc_thread_create (for instance for the main thread)
875 *****************************************************************************/
876 int __vlc_thread_set_priority( vlc_object_t *p_this, const char * psz_file,
877 int i_line, int i_priority )
879 vlc_object_internals_t *p_priv = vlc_internals( p_this );
881 if( !p_priv->b_thread )
883 msg_Err( p_this, "couldn't set priority of non-existent thread" );
887 #if defined( LIBVLC_USE_PTHREAD )
889 if( config_GetInt( p_this, "rt-priority" ) > 0 )
892 int i_error, i_policy;
893 struct sched_param param;
895 memset( ¶m, 0, sizeof(struct sched_param) );
896 if( config_GetType( p_this, "rt-offset" ) )
897 i_priority += config_GetInt( p_this, "rt-offset" );
898 if( i_priority <= 0 )
900 param.sched_priority = (-1) * i_priority;
901 i_policy = SCHED_OTHER;
905 param.sched_priority = i_priority;
908 if( (i_error = pthread_setschedparam( p_priv->thread_id,
909 i_policy, ¶m )) )
912 msg_Warn( p_this, "couldn't set thread priority (%s:%d): %m",
918 #elif defined( WIN32 ) || defined( UNDER_CE )
919 VLC_UNUSED( psz_file); VLC_UNUSED( i_line );
921 if( !SetThreadPriority(p_priv->thread_id->handle, i_priority) )
923 msg_Warn( p_this, "couldn't set a faster priority" );
932 /*****************************************************************************
933 * vlc_thread_join: wait until a thread exits, inner version
934 *****************************************************************************/
935 void __vlc_thread_join( vlc_object_t *p_this )
937 vlc_object_internals_t *p_priv = vlc_internals( p_this );
939 #if defined( LIBVLC_USE_PTHREAD )
940 vlc_join (p_priv->thread_id, NULL);
942 #elif defined( UNDER_CE ) || defined( WIN32 )
944 FILETIME create_ft, exit_ft, kernel_ft, user_ft;
945 int64_t real_time, kernel_time, user_time;
947 if( ! DuplicateHandle(GetCurrentProcess(),
948 p_priv->thread_id->handle,
953 DUPLICATE_SAME_ACCESS) )
955 p_priv->b_thread = false;
956 return; /* We have a problem! */
959 vlc_join( p_priv->thread_id, NULL );
961 if( GetThreadTimes( hThread, &create_ft, &exit_ft, &kernel_ft, &user_ft ) )
964 ((((int64_t)exit_ft.dwHighDateTime)<<32)| exit_ft.dwLowDateTime) -
965 ((((int64_t)create_ft.dwHighDateTime)<<32)| create_ft.dwLowDateTime);
969 ((((int64_t)kernel_ft.dwHighDateTime)<<32)|
970 kernel_ft.dwLowDateTime) / 10;
973 ((((int64_t)user_ft.dwHighDateTime)<<32)|
974 user_ft.dwLowDateTime) / 10;
976 msg_Dbg( p_this, "thread times: "
977 "real %"PRId64"m%fs, kernel %"PRId64"m%fs, user %"PRId64"m%fs",
978 real_time/60/1000000,
979 (double)((real_time%(60*1000000))/1000000.0),
980 kernel_time/60/1000000,
981 (double)((kernel_time%(60*1000000))/1000000.0),
982 user_time/60/1000000,
983 (double)((user_time%(60*1000000))/1000000.0) );
985 CloseHandle( hThread );
988 vlc_join( p_priv->thread_id, NULL );
992 p_priv->b_thread = false;
995 void vlc_thread_cancel (vlc_object_t *obj)
997 vlc_object_internals_t *priv = vlc_internals (obj);
1000 vlc_cancel (priv->thread_id);
1003 void vlc_control_cancel (int cmd, ...)
1005 /* NOTE: This function only modifies thread-specific data, so there is no
1006 * need to lock anything. */
1007 #ifdef LIBVLC_USE_PTHREAD_CANCEL
1013 vlc_cancel_t *nfo = vlc_threadvar_get (&cancel_key);
1017 /* Main thread - cannot be cancelled anyway */
1020 nfo = malloc (sizeof (*nfo));
1022 return; /* Uho! Expect problems! */
1023 *nfo = VLC_CANCEL_INIT;
1024 vlc_threadvar_set (&cancel_key, nfo);
1031 case VLC_SAVE_CANCEL:
1033 int *p_state = va_arg (ap, int *);
1034 *p_state = nfo->killable;
1035 nfo->killable = false;
1039 case VLC_RESTORE_CANCEL:
1041 int state = va_arg (ap, int);
1042 nfo->killable = state != 0;
1046 case VLC_TEST_CANCEL:
1047 if (nfo->killable && nfo->killed)
1049 for (vlc_cleanup_t *p = nfo->cleaners; p != NULL; p = p->next)
1052 #if defined (LIBVLC_USE_PTHREAD)
1053 pthread_exit (PTHREAD_CANCELLED);
1054 #elif defined (WIN32)
1057 # error Not implemented!
1066 case VLC_CLEANUP_PUSH:
1068 /* cleaner is a pointer to the caller stack, no need to allocate
1069 * and copy anything. As a nice side effect, this cannot fail. */
1070 vlc_cleanup_t *cleaner = va_arg (ap, vlc_cleanup_t *);
1071 cleaner->next = nfo->cleaners;
1072 nfo->cleaners = cleaner;
1076 case VLC_CLEANUP_POP:
1078 nfo->cleaners = nfo->cleaners->next;