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 *****************************************************************************/
115 vlc_thread_fatal (const char *action, int error,
116 const char *function, const char *file, unsigned line)
118 fprintf (stderr, "LibVLC fatal error %s (%d) in thread %lu ",
119 action, error, vlc_threadid ());
120 vlc_trace (function, file, line);
122 /* Sometimes strerror_r() crashes too, so make sure we print an error
123 * message before we invoke it */
125 /* Avoid the strerror_r() prototype brain damage in glibc */
127 fprintf (stderr, " Error message: %m at:\n");
128 #elif !defined (WIN32)
132 switch (strerror_r (error, buf, sizeof (buf)))
137 case ERANGE: /* should never happen */
138 msg = "unknwon (too big to display)";
141 msg = "unknown (invalid error number)";
144 fprintf (stderr, " Error message: %s\n", msg);
152 # define VLC_THREAD_ASSERT( action ) \
153 if (val) vlc_thread_fatal (action, val, __func__, __FILE__, __LINE__)
155 # define VLC_THREAD_ASSERT( action ) ((void)val)
159 * Per-thread cancellation data
161 #ifndef LIBVLC_USE_PTHREAD_CANCEL
162 typedef struct vlc_cancel_t
164 vlc_cleanup_t *cleaners;
169 # define VLC_CANCEL_INIT { NULL, true, false }
172 /*****************************************************************************
173 * vlc_threads_init: initialize threads system
174 *****************************************************************************
175 * This function requires lazy initialization of a global lock in order to
176 * keep the library really thread-safe. Some architectures don't support this
177 * and thus do not guarantee the complete reentrancy.
178 *****************************************************************************/
179 int vlc_threads_init( void )
181 int i_ret = VLC_SUCCESS;
183 /* If we have lazy mutex initialization, use it. Otherwise, we just
184 * hope nothing wrong happens. */
185 #if defined( LIBVLC_USE_PTHREAD )
186 pthread_mutex_lock( &once_mutex );
189 if( i_initializations == 0 )
191 p_root = vlc_custom_create( (vlc_object_t *)NULL, sizeof( *p_root ),
192 VLC_OBJECT_GENERIC, "root" );
199 /* We should be safe now. Do all the initialization stuff we want. */
200 #ifndef LIBVLC_USE_PTHREAD_CANCEL
201 vlc_threadvar_create( &cancel_key, free );
207 /* If we have lazy mutex initialization support, unlock the mutex.
208 * Otherwize, we are screwed. */
209 #if defined( LIBVLC_USE_PTHREAD )
210 pthread_mutex_unlock( &once_mutex );
216 /*****************************************************************************
217 * vlc_threads_end: stop threads system
218 *****************************************************************************
219 * FIXME: This function is far from being threadsafe.
220 *****************************************************************************/
221 void vlc_threads_end( void )
223 #if defined( LIBVLC_USE_PTHREAD )
224 pthread_mutex_lock( &once_mutex );
227 assert( i_initializations > 0 );
229 if( i_initializations == 1 )
231 vlc_object_release( p_root );
232 #ifndef LIBVLC_USE_PTHREAD
233 vlc_threadvar_delete( &cancel_key );
238 #if defined( LIBVLC_USE_PTHREAD )
239 pthread_mutex_unlock( &once_mutex );
243 #if defined (__GLIBC__) && (__GLIBC_MINOR__ < 6)
244 /* This is not prototyped under glibc, though it exists. */
245 int pthread_mutexattr_setkind_np( pthread_mutexattr_t *attr, int kind );
248 /*****************************************************************************
249 * vlc_mutex_init: initialize a mutex
250 *****************************************************************************/
251 int vlc_mutex_init( vlc_mutex_t *p_mutex )
253 #if defined( LIBVLC_USE_PTHREAD )
254 pthread_mutexattr_t attr;
257 pthread_mutexattr_init( &attr );
260 /* Create error-checking mutex to detect problems more easily. */
261 # if defined (__GLIBC__) && (__GLIBC_MINOR__ < 6)
262 pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_ERRORCHECK_NP );
264 pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_ERRORCHECK );
267 i_result = pthread_mutex_init( p_mutex, &attr );
268 pthread_mutexattr_destroy( &attr );
270 #elif defined( UNDER_CE )
271 InitializeCriticalSection( &p_mutex->csection );
274 #elif defined( WIN32 )
275 *p_mutex = CreateMutex( NULL, FALSE, NULL );
276 return (*p_mutex != NULL) ? 0 : ENOMEM;
281 /*****************************************************************************
282 * vlc_mutex_init: initialize a recursive mutex (Do not use)
283 *****************************************************************************/
284 int vlc_mutex_init_recursive( vlc_mutex_t *p_mutex )
286 #if defined( LIBVLC_USE_PTHREAD )
287 pthread_mutexattr_t attr;
290 pthread_mutexattr_init( &attr );
291 # if defined (__GLIBC__) && (__GLIBC_MINOR__ < 6)
292 pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_RECURSIVE_NP );
294 pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_RECURSIVE );
296 i_result = pthread_mutex_init( p_mutex, &attr );
297 pthread_mutexattr_destroy( &attr );
299 #elif defined( WIN32 )
300 /* Create mutex returns a recursive mutex */
301 *p_mutex = CreateMutex( 0, FALSE, 0 );
302 return (*p_mutex != NULL) ? 0 : ENOMEM;
304 # error Unimplemented!
310 * Destroys a mutex. The mutex must not be locked.
312 * @param p_mutex mutex to destroy
313 * @return always succeeds
315 void vlc_mutex_destroy (vlc_mutex_t *p_mutex)
317 #if defined( LIBVLC_USE_PTHREAD )
318 int val = pthread_mutex_destroy( p_mutex );
319 VLC_THREAD_ASSERT ("destroying mutex");
321 #elif defined( UNDER_CE )
322 DeleteCriticalSection( &p_mutex->csection );
324 #elif defined( WIN32 )
325 CloseHandle( *p_mutex );
331 * Acquires a mutex. If needed, waits for any other thread to release it.
332 * Beware of deadlocks when locking multiple mutexes at the same time,
333 * or when using mutexes from callbacks.
335 * @param p_mutex mutex initialized with vlc_mutex_init() or
336 * vlc_mutex_init_recursive()
338 void vlc_mutex_lock (vlc_mutex_t *p_mutex)
340 #if defined(LIBVLC_USE_PTHREAD)
341 int val = pthread_mutex_lock( p_mutex );
342 VLC_THREAD_ASSERT ("locking mutex");
344 #elif defined( UNDER_CE )
345 EnterCriticalSection( &p_mutex->csection );
347 #elif defined( WIN32 )
348 WaitForSingleObject( *p_mutex, INFINITE );
355 * Releases a mutex (or crashes if the mutex is not locked by the caller).
356 * @param p_mutex mutex locked with vlc_mutex_lock().
358 void vlc_mutex_unlock (vlc_mutex_t *p_mutex)
360 #if defined(LIBVLC_USE_PTHREAD)
361 int val = pthread_mutex_unlock( p_mutex );
362 VLC_THREAD_ASSERT ("unlocking mutex");
364 #elif defined( UNDER_CE )
365 LeaveCriticalSection( &p_mutex->csection );
367 #elif defined( WIN32 )
368 ReleaseMutex( *p_mutex );
373 /*****************************************************************************
374 * vlc_cond_init: initialize a condition variable
375 *****************************************************************************/
376 int vlc_cond_init( vlc_cond_t *p_condvar )
378 #if defined( LIBVLC_USE_PTHREAD )
379 pthread_condattr_t attr;
382 ret = pthread_condattr_init (&attr);
386 # if !defined (_POSIX_CLOCK_SELECTION)
387 /* Fairly outdated POSIX support (that was defined in 2001) */
388 # define _POSIX_CLOCK_SELECTION (-1)
390 # if (_POSIX_CLOCK_SELECTION >= 0)
391 /* NOTE: This must be the same clock as the one in mtime.c */
392 pthread_condattr_setclock (&attr, CLOCK_MONOTONIC);
395 ret = pthread_cond_init (p_condvar, &attr);
396 pthread_condattr_destroy (&attr);
399 #elif defined( UNDER_CE ) || defined( WIN32 )
400 /* Create an auto-reset event. */
401 *p_condvar = CreateEvent( NULL, /* no security */
402 FALSE, /* auto-reset event */
403 FALSE, /* start non-signaled */
404 NULL ); /* unnamed */
405 return *p_condvar ? 0 : ENOMEM;
411 * Destroys a condition variable. No threads shall be waiting or signaling the
413 * @param p_condvar condition variable to destroy
415 void vlc_cond_destroy (vlc_cond_t *p_condvar)
417 #if defined( LIBVLC_USE_PTHREAD )
418 int val = pthread_cond_destroy( p_condvar );
419 VLC_THREAD_ASSERT ("destroying condition");
421 #elif defined( UNDER_CE ) || defined( WIN32 )
422 CloseHandle( *p_condvar );
428 * Wakes up one thread waiting on a condition variable, if any.
429 * @param p_condvar condition variable
431 void vlc_cond_signal (vlc_cond_t *p_condvar)
433 #if defined(LIBVLC_USE_PTHREAD)
434 int val = pthread_cond_signal( p_condvar );
435 VLC_THREAD_ASSERT ("signaling condition variable");
437 #elif defined( UNDER_CE ) || defined( WIN32 )
438 /* Release one waiting thread if one is available. */
439 /* For this trick to work properly, the vlc_cond_signal must be surrounded
440 * by a mutex. This will prevent another thread from stealing the signal */
441 /* PulseEvent() only works if none of the waiting threads is suspended.
442 * This is particularily problematic under a debug session.
443 * as documented in http://support.microsoft.com/kb/q173260/ */
444 PulseEvent( *p_condvar );
450 * Wakes up all threads (if any) waiting on a condition variable.
451 * @param p_cond condition variable
453 void vlc_cond_broadcast (vlc_cond_t *p_condvar)
455 #if defined (LIBVLC_USE_PTHREAD)
456 pthread_cond_broadcast (p_condvar);
458 #elif defined (WIN32)
459 SetEvent (*p_condvar);
465 * Waits for a condition variable. The calling thread will be suspended until
466 * another thread calls vlc_cond_signal() or vlc_cond_broadcast() on the same
467 * condition variable, the thread is cancelled with vlc_cancel(), or the
468 * system causes a "spurious" unsolicited wake-up.
470 * A mutex is needed to wait on a condition variable. It must <b>not</b> be
471 * a recursive mutex. Although it is possible to use the same mutex for
472 * multiple condition, it is not valid to use different mutexes for the same
473 * condition variable at the same time from different threads.
475 * In case of thread cancellation, the mutex is always locked before
476 * cancellation proceeds.
478 * The canonical way to use a condition variable to wait for event foobar is:
480 vlc_mutex_lock (&lock);
481 mutex_cleanup_push (&lock); // release the mutex in case of cancellation
484 vlc_cond_wait (&wait, &lock);
486 --- foobar is now true, do something about it here --
488 vlc_cleanup_run (); // release the mutex
491 * @param p_condvar condition variable to wait on
492 * @param p_mutex mutex which is unlocked while waiting,
493 * then locked again when waking up.
494 * @param deadline <b>absolute</b> timeout
496 * @return 0 if the condition was signaled, an error code in case of timeout.
498 void vlc_cond_wait (vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex)
500 #if defined(LIBVLC_USE_PTHREAD)
501 int val = pthread_cond_wait( p_condvar, p_mutex );
502 VLC_THREAD_ASSERT ("waiting on condition");
504 #elif defined( UNDER_CE )
505 LeaveCriticalSection( &p_mutex->csection );
506 WaitForSingleObject( *p_condvar, INFINITE );
508 /* Reacquire the mutex before returning. */
509 vlc_mutex_lock( p_mutex );
511 #elif defined( WIN32 )
514 while (SignalObjectAndWait (*p_mutex, *p_condvar, INFINITE, TRUE)
515 == WAIT_IO_COMPLETION);
517 /* Reacquire the mutex before returning. */
518 vlc_mutex_lock( p_mutex );
524 * Waits for a condition variable up to a certain date.
525 * This works like vlc_cond_wait(), except for the additional timeout.
527 * @param p_condvar condition variable to wait on
528 * @param p_mutex mutex which is unlocked while waiting,
529 * then locked again when waking up.
530 * @param deadline <b>absolute</b> timeout
532 * @return 0 if the condition was signaled, an error code in case of timeout.
534 int vlc_cond_timedwait (vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex,
537 #if defined(LIBVLC_USE_PTHREAD)
538 lldiv_t d = lldiv( deadline, CLOCK_FREQ );
539 struct timespec ts = { d.quot, d.rem * (1000000000 / CLOCK_FREQ) };
541 int val = pthread_cond_timedwait (p_condvar, p_mutex, &ts);
542 if (val != ETIMEDOUT)
543 VLC_THREAD_ASSERT ("timed-waiting on condition");
546 #elif defined( UNDER_CE )
547 mtime_t delay_ms = (deadline - mdate()) / (CLOCK_FREQ / 1000);
552 LeaveCriticalSection( &p_mutex->csection );
553 result = WaitForSingleObject( *p_condvar, delay_ms );
555 /* Reacquire the mutex before returning. */
556 vlc_mutex_lock( p_mutex );
558 return (result == WAIT_TIMEOUT) ? ETIMEDOUT : 0;
560 #elif defined( WIN32 )
567 mtime_t total = (deadline - mdate ())/1000;
571 DWORD delay = (total > 0x7fffffff) ? 0x7fffffff : total;
572 result = SignalObjectAndWait (*p_mutex, *p_condvar, delay, TRUE);
574 while (result == WAIT_IO_COMPLETION);
576 /* Reacquire the mutex before return/cancel. */
577 vlc_mutex_lock (p_mutex);
578 return (result == WAIT_OBJECT_0) ? 0 : ETIMEDOUT;
583 /*****************************************************************************
584 * vlc_tls_create: create a thread-local variable
585 *****************************************************************************/
586 int vlc_threadvar_create( vlc_threadvar_t *p_tls, void (*destr) (void *) )
590 #if defined( LIBVLC_USE_PTHREAD )
591 i_ret = pthread_key_create( p_tls, destr );
592 #elif defined( UNDER_CE )
594 #elif defined( WIN32 )
595 /* FIXME: remember/use the destr() callback and stop leaking whatever */
597 i_ret = (*p_tls == TLS_OUT_OF_INDEXES) ? EAGAIN : 0;
599 # error Unimplemented!
604 void vlc_threadvar_delete (vlc_threadvar_t *p_tls)
606 #if defined( LIBVLC_USE_PTHREAD )
607 pthread_key_delete (*p_tls);
608 #elif defined( UNDER_CE )
609 #elif defined( WIN32 )
612 # error Unimplemented!
616 #if defined (LIBVLC_USE_PTHREAD)
617 #elif defined (WIN32)
618 static unsigned __stdcall vlc_entry (void *data)
620 vlc_cancel_t cancel_data = VLC_CANCEL_INIT;
621 vlc_thread_t self = data;
623 vlc_threadvar_set (&cancel_key, &cancel_data);
624 self->data = self->entry (self->data);
630 * Creates and starts new thread.
632 * @param p_handle [OUT] pointer to write the handle of the created thread to
633 * @param entry entry point for the thread
634 * @param data data parameter given to the entry point
635 * @param priority thread priority value
636 * @return 0 on success, a standard error code on error.
638 int vlc_clone (vlc_thread_t *p_handle, void * (*entry) (void *), void *data,
643 #if defined( LIBVLC_USE_PTHREAD )
645 pthread_attr_init (&attr);
647 /* Block the signals that signals interface plugin handles.
648 * If the LibVLC caller wants to handle some signals by itself, it should
649 * block these before whenever invoking LibVLC. And it must obviously not
650 * start the VLC signals interface plugin.
652 * LibVLC will normally ignore any interruption caused by an asynchronous
653 * signal during a system call. But there may well be some buggy cases
654 * where it fails to handle EINTR (bug reports welcome). Some underlying
655 * libraries might also not handle EINTR properly.
661 sigdelset (&set, SIGHUP);
662 sigaddset (&set, SIGINT);
663 sigaddset (&set, SIGQUIT);
664 sigaddset (&set, SIGTERM);
666 sigaddset (&set, SIGPIPE); /* We don't want this one, really! */
667 pthread_sigmask (SIG_BLOCK, &set, &oldset);
670 struct sched_param sp = { .sched_priority = priority, };
673 if (sp.sched_priority <= 0)
674 sp.sched_priority += sched_get_priority_max (policy = SCHED_OTHER);
676 sp.sched_priority += sched_get_priority_min (policy = SCHED_RR);
678 pthread_attr_setschedpolicy (&attr, policy);
679 pthread_attr_setschedparam (&attr, &sp);
682 ret = pthread_create (p_handle, &attr, entry, data);
683 pthread_sigmask (SIG_SETMASK, &oldset, NULL);
684 pthread_attr_destroy (&attr);
686 #elif defined( WIN32 ) || defined( UNDER_CE )
687 /* When using the MSVCRT C library you have to use the _beginthreadex
688 * function instead of CreateThread, otherwise you'll end up with
689 * memory leaks and the signal functions not working (see Microsoft
690 * Knowledge Base, article 104641) */
692 vlc_thread_t th = malloc (sizeof (*th));
699 #if defined( UNDER_CE )
700 hThread = CreateThread (NULL, 0, vlc_entry, th, CREATE_SUSPENDED, NULL);
702 hThread = (HANDLE)(uintptr_t)
703 _beginthreadex (NULL, 0, vlc_entry, th, CREATE_SUSPENDED, NULL);
708 /* Thread closes the handle when exiting, duplicate it here
709 * to be on the safe side when joining. */
710 if (!DuplicateHandle (GetCurrentProcess (), hThread,
711 GetCurrentProcess (), &th->handle, 0, FALSE,
712 DUPLICATE_SAME_ACCESS))
714 CloseHandle (hThread);
719 ResumeThread (hThread);
721 SetThreadPriority (hThread, priority);
737 /* APC procedure for thread cancellation */
738 static void CALLBACK vlc_cancel_self (ULONG_PTR dummy)
741 vlc_control_cancel (VLC_DO_CANCEL);
746 * Marks a thread as cancelled. Next time the target thread reaches a
747 * cancellation point (while not having disabled cancellation), it will
748 * run its cancellation cleanup handler, the thread variable destructors, and
749 * terminate. vlc_join() must be used afterward regardless of a thread being
752 void vlc_cancel (vlc_thread_t thread_id)
754 #if defined (LIBVLC_USE_PTHREAD_CANCEL)
755 pthread_cancel (thread_id);
756 #elif defined (WIN32)
757 QueueUserAPC (vlc_cancel_self, thread_id->handle, 0);
759 # warning vlc_cancel is not implemented!
764 * Waits for a thread to complete (if needed), and destroys it.
765 * This is a cancellation point; in case of cancellation, the join does _not_
768 * @param handle thread handle
769 * @param p_result [OUT] pointer to write the thread return value or NULL
770 * @return 0 on success, a standard error code otherwise.
772 void vlc_join (vlc_thread_t handle, void **result)
774 #if defined( LIBVLC_USE_PTHREAD )
775 int val = pthread_join (handle, result);
777 vlc_thread_fatal ("joining thread", val, __func__, __FILE__, __LINE__);
779 #elif defined( UNDER_CE ) || defined( WIN32 )
782 while (WaitForSingleObjectEx (handle->handle, INFINITE, TRUE)
783 == WAIT_IO_COMPLETION);
785 CloseHandle (handle->handle);
787 *result = handle->data;
794 struct vlc_thread_boot
796 void * (*entry) (vlc_object_t *);
797 vlc_object_t *object;
800 static void *thread_entry (void *data)
802 vlc_object_t *obj = ((struct vlc_thread_boot *)data)->object;
803 void *(*func) (vlc_object_t *) = ((struct vlc_thread_boot *)data)->entry;
806 msg_Dbg (obj, "thread started");
808 msg_Dbg (obj, "thread ended");
813 /*****************************************************************************
814 * vlc_thread_create: create a thread, inner version
815 *****************************************************************************
816 * Note that i_priority is only taken into account on platforms supporting
817 * userland real-time priority threads.
818 *****************************************************************************/
819 int __vlc_thread_create( vlc_object_t *p_this, const char * psz_file, int i_line,
820 const char *psz_name, void * ( *func ) ( vlc_object_t * ),
821 int i_priority, bool b_wait )
824 vlc_object_internals_t *p_priv = vlc_internals( p_this );
826 struct vlc_thread_boot *boot = malloc (sizeof (*boot));
830 boot->object = p_this;
832 vlc_object_lock( p_this );
834 /* Make sure we don't re-create a thread if the object has already one */
835 assert( !p_priv->b_thread );
837 #if defined( LIBVLC_USE_PTHREAD )
839 if( config_GetInt( p_this, "rt-priority" ) > 0 )
842 /* Hack to avoid error msg */
843 if( config_GetType( p_this, "rt-offset" ) )
844 i_priority += config_GetInt( p_this, "rt-offset" );
848 i_ret = vlc_clone( &p_priv->thread_id, thread_entry, boot, i_priority );
853 msg_Dbg( p_this, "waiting for thread initialization" );
854 vlc_object_wait( p_this );
857 p_priv->b_thread = true;
858 msg_Dbg( p_this, "thread %lu (%s) created at priority %d (%s:%d)",
859 (unsigned long)p_priv->thread_id, psz_name, i_priority,
865 msg_Err( p_this, "%s thread could not be created at %s:%d (%m)",
866 psz_name, psz_file, i_line );
869 vlc_object_unlock( p_this );
873 /*****************************************************************************
874 * vlc_thread_set_priority: set the priority of the current thread when we
875 * couldn't set it in vlc_thread_create (for instance for the main thread)
876 *****************************************************************************/
877 int __vlc_thread_set_priority( vlc_object_t *p_this, const char * psz_file,
878 int i_line, int i_priority )
880 vlc_object_internals_t *p_priv = vlc_internals( p_this );
882 if( !p_priv->b_thread )
884 msg_Err( p_this, "couldn't set priority of non-existent thread" );
888 #if defined( LIBVLC_USE_PTHREAD )
890 if( config_GetInt( p_this, "rt-priority" ) > 0 )
893 int i_error, i_policy;
894 struct sched_param param;
896 memset( ¶m, 0, sizeof(struct sched_param) );
897 if( config_GetType( p_this, "rt-offset" ) )
898 i_priority += config_GetInt( p_this, "rt-offset" );
899 if( i_priority <= 0 )
901 param.sched_priority = (-1) * i_priority;
902 i_policy = SCHED_OTHER;
906 param.sched_priority = i_priority;
909 if( (i_error = pthread_setschedparam( p_priv->thread_id,
910 i_policy, ¶m )) )
913 msg_Warn( p_this, "couldn't set thread priority (%s:%d): %m",
919 #elif defined( WIN32 ) || defined( UNDER_CE )
920 VLC_UNUSED( psz_file); VLC_UNUSED( i_line );
922 if( !SetThreadPriority(p_priv->thread_id->handle, i_priority) )
924 msg_Warn( p_this, "couldn't set a faster priority" );
933 /*****************************************************************************
934 * vlc_thread_join: wait until a thread exits, inner version
935 *****************************************************************************/
936 void __vlc_thread_join( vlc_object_t *p_this )
938 vlc_object_internals_t *p_priv = vlc_internals( p_this );
940 #if defined( LIBVLC_USE_PTHREAD )
941 vlc_join (p_priv->thread_id, NULL);
943 #elif defined( UNDER_CE ) || defined( WIN32 )
945 FILETIME create_ft, exit_ft, kernel_ft, user_ft;
946 int64_t real_time, kernel_time, user_time;
948 if( ! DuplicateHandle(GetCurrentProcess(),
949 p_priv->thread_id->handle,
954 DUPLICATE_SAME_ACCESS) )
956 p_priv->b_thread = false;
957 return; /* We have a problem! */
960 vlc_join( p_priv->thread_id, NULL );
962 if( GetThreadTimes( hThread, &create_ft, &exit_ft, &kernel_ft, &user_ft ) )
965 ((((int64_t)exit_ft.dwHighDateTime)<<32)| exit_ft.dwLowDateTime) -
966 ((((int64_t)create_ft.dwHighDateTime)<<32)| create_ft.dwLowDateTime);
970 ((((int64_t)kernel_ft.dwHighDateTime)<<32)|
971 kernel_ft.dwLowDateTime) / 10;
974 ((((int64_t)user_ft.dwHighDateTime)<<32)|
975 user_ft.dwLowDateTime) / 10;
977 msg_Dbg( p_this, "thread times: "
978 "real %"PRId64"m%fs, kernel %"PRId64"m%fs, user %"PRId64"m%fs",
979 real_time/60/1000000,
980 (double)((real_time%(60*1000000))/1000000.0),
981 kernel_time/60/1000000,
982 (double)((kernel_time%(60*1000000))/1000000.0),
983 user_time/60/1000000,
984 (double)((user_time%(60*1000000))/1000000.0) );
986 CloseHandle( hThread );
989 vlc_join( p_priv->thread_id, NULL );
993 p_priv->b_thread = false;
996 void vlc_thread_cancel (vlc_object_t *obj)
998 vlc_object_internals_t *priv = vlc_internals (obj);
1001 vlc_cancel (priv->thread_id);
1004 void vlc_control_cancel (int cmd, ...)
1006 /* NOTE: This function only modifies thread-specific data, so there is no
1007 * need to lock anything. */
1008 #ifdef LIBVLC_USE_PTHREAD_CANCEL
1014 vlc_cancel_t *nfo = vlc_threadvar_get (&cancel_key);
1018 /* Main thread - cannot be cancelled anyway */
1021 nfo = malloc (sizeof (*nfo));
1023 return; /* Uho! Expect problems! */
1024 *nfo = VLC_CANCEL_INIT;
1025 vlc_threadvar_set (&cancel_key, nfo);
1032 case VLC_SAVE_CANCEL:
1034 int *p_state = va_arg (ap, int *);
1035 *p_state = nfo->killable;
1036 nfo->killable = false;
1040 case VLC_RESTORE_CANCEL:
1042 int state = va_arg (ap, int);
1043 nfo->killable = state != 0;
1047 case VLC_TEST_CANCEL:
1048 if (nfo->killable && nfo->killed)
1050 for (vlc_cleanup_t *p = nfo->cleaners; p != NULL; p = p->next)
1053 #if defined (LIBVLC_USE_PTHREAD)
1054 pthread_exit (PTHREAD_CANCELLED);
1055 #elif defined (WIN32)
1058 # error Not implemented!
1067 case VLC_CLEANUP_PUSH:
1069 /* cleaner is a pointer to the caller stack, no need to allocate
1070 * and copy anything. As a nice side effect, this cannot fail. */
1071 vlc_cleanup_t *cleaner = va_arg (ap, vlc_cleanup_t *);
1072 cleaner->next = nfo->cleaners;
1073 nfo->cleaners = cleaner;
1077 case VLC_CLEANUP_POP:
1079 nfo->cleaners = nfo->cleaners->next;