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 #if defined( LIBVLC_USE_PTHREAD )
45 static vlc_threadvar_t cancel_key;
48 #ifdef HAVE_EXECINFO_H
49 # include <execinfo.h>
53 # define WaitForSingleObjectEx(a,b,c) WaitForSingleObject(a,b)
57 * Print a backtrace to the standard error for debugging purpose.
59 void vlc_trace (const char *fn, const char *file, unsigned line)
61 fprintf (stderr, "at %s:%u in %s\n", file, line, fn);
62 fflush (stderr); /* needed before switch to low-level I/O */
65 int len = backtrace (stack, sizeof (stack) / sizeof (stack[0]));
66 backtrace_symbols_fd (stack, len, 2);
73 static inline unsigned long vlc_threadid (void)
75 #if defined(LIBVLC_USE_PTHREAD)
76 union { pthread_t th; unsigned long int i; } v = { };
77 v.th = pthread_self ();
81 return GetCurrentThreadId ();
89 /*****************************************************************************
90 * vlc_thread_fatal: Report an error from the threading layer
91 *****************************************************************************
92 * This is mostly meant for debugging.
93 *****************************************************************************/
95 vlc_thread_fatal (const char *action, int error,
96 const char *function, const char *file, unsigned line)
98 fprintf (stderr, "LibVLC fatal error %s (%d) in thread %lu ",
99 action, error, vlc_threadid ());
100 vlc_trace (function, file, line);
102 /* Sometimes strerror_r() crashes too, so make sure we print an error
103 * message before we invoke it */
105 /* Avoid the strerror_r() prototype brain damage in glibc */
107 fprintf (stderr, " Error message: %m\n");
108 #elif !defined (WIN32)
112 switch (strerror_r (error, buf, sizeof (buf)))
117 case ERANGE: /* should never happen */
118 msg = "unknwon (too big to display)";
121 msg = "unknown (invalid error number)";
124 fprintf (stderr, " Error message: %s\n", msg);
132 # define VLC_THREAD_ASSERT( action ) \
133 if (val) vlc_thread_fatal (action, val, __func__, __FILE__, __LINE__)
135 # define VLC_THREAD_ASSERT( action ) ((void)val)
139 * Per-thread cancellation data
141 #ifndef LIBVLC_USE_PTHREAD_CANCEL
142 typedef struct vlc_cancel_t
144 vlc_cleanup_t *cleaners;
149 # define VLC_CANCEL_INIT { NULL, true, false }
153 static vlc_mutex_t super_mutex;
155 BOOL WINAPI DllMain (HINSTANCE hinstDll, DWORD fdwReason, LPVOID lpvReserved)
162 case DLL_PROCESS_ATTACH:
163 vlc_mutex_init (&super_mutex);
164 vlc_threadvar_create (&cancel_key, free);
167 case DLL_PROCESS_DETACH:
168 vlc_threadvar_delete( &cancel_key );
169 vlc_mutex_destroy (&super_mutex);
176 #if defined (__GLIBC__) && (__GLIBC_MINOR__ < 6)
177 /* This is not prototyped under glibc, though it exists. */
178 int pthread_mutexattr_setkind_np( pthread_mutexattr_t *attr, int kind );
181 /*****************************************************************************
182 * vlc_mutex_init: initialize a mutex
183 *****************************************************************************/
184 int vlc_mutex_init( vlc_mutex_t *p_mutex )
186 #if defined( LIBVLC_USE_PTHREAD )
187 pthread_mutexattr_t attr;
190 pthread_mutexattr_init( &attr );
193 /* Create error-checking mutex to detect problems more easily. */
194 # if defined (__GLIBC__) && (__GLIBC_MINOR__ < 6)
195 pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_ERRORCHECK_NP );
197 pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_ERRORCHECK );
200 i_result = pthread_mutex_init( p_mutex, &attr );
201 pthread_mutexattr_destroy( &attr );
204 #elif defined( WIN32 )
205 /* This creates a recursive mutex. This is OK as fast mutexes have
206 * no defined behavior in case of recursive locking. */
207 InitializeCriticalSection (&p_mutex->mutex);
213 /*****************************************************************************
214 * vlc_mutex_init: initialize a recursive mutex (Do not use)
215 *****************************************************************************/
216 int vlc_mutex_init_recursive( vlc_mutex_t *p_mutex )
218 #if defined( LIBVLC_USE_PTHREAD )
219 pthread_mutexattr_t attr;
222 pthread_mutexattr_init( &attr );
223 # if defined (__GLIBC__) && (__GLIBC_MINOR__ < 6)
224 pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_RECURSIVE_NP );
226 pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_RECURSIVE );
228 i_result = pthread_mutex_init( p_mutex, &attr );
229 pthread_mutexattr_destroy( &attr );
232 #elif defined( WIN32 )
233 InitializeCriticalSection( &p_mutex->mutex );
234 InterlockedIncrement (&p_mutex->initialized);
243 * Destroys a mutex. The mutex must not be locked.
245 * @param p_mutex mutex to destroy
246 * @return always succeeds
248 void vlc_mutex_destroy (vlc_mutex_t *p_mutex)
250 #if defined( LIBVLC_USE_PTHREAD )
251 int val = pthread_mutex_destroy( p_mutex );
252 VLC_THREAD_ASSERT ("destroying mutex");
254 #elif defined( WIN32 )
255 InterlockedDecrement (&p_mutex->initialized);
256 DeleteCriticalSection (&p_mutex->mutex);
262 * Acquires a mutex. If needed, waits for any other thread to release it.
263 * Beware of deadlocks when locking multiple mutexes at the same time,
264 * or when using mutexes from callbacks.
266 * @param p_mutex mutex initialized with vlc_mutex_init() or
267 * vlc_mutex_init_recursive()
269 void vlc_mutex_lock (vlc_mutex_t *p_mutex)
271 #if defined(LIBVLC_USE_PTHREAD)
272 int val = pthread_mutex_lock( p_mutex );
273 VLC_THREAD_ASSERT ("locking mutex");
275 #elif defined( WIN32 )
276 if (InterlockedCompareExchange (&p_mutex->initialized, 0, 0) == 0)
277 { /* ^^ We could also lock super_mutex all the time... sluggish */
278 assert (p_mutex != &super_mutex); /* this one cannot be static */
280 vlc_mutex_lock (&super_mutex);
281 vlc_mutex_init (p_mutex);
282 /* FIXME: destroy the mutex some time... */
283 vlc_mutex_unlock (&super_mutex);
285 EnterCriticalSection (&p_mutex->mutex);
292 * Releases a mutex (or crashes if the mutex is not locked by the caller).
293 * @param p_mutex mutex locked with vlc_mutex_lock().
295 void vlc_mutex_unlock (vlc_mutex_t *p_mutex)
297 #if defined(LIBVLC_USE_PTHREAD)
298 int val = pthread_mutex_unlock( p_mutex );
299 VLC_THREAD_ASSERT ("unlocking mutex");
301 #elif defined( WIN32 )
302 LeaveCriticalSection (&p_mutex->mutex);
307 /*****************************************************************************
308 * vlc_cond_init: initialize a condition variable
309 *****************************************************************************/
310 int vlc_cond_init( vlc_cond_t *p_condvar )
312 #if defined( LIBVLC_USE_PTHREAD )
313 pthread_condattr_t attr;
316 ret = pthread_condattr_init (&attr);
320 # if !defined (_POSIX_CLOCK_SELECTION)
321 /* Fairly outdated POSIX support (that was defined in 2001) */
322 # define _POSIX_CLOCK_SELECTION (-1)
324 # if (_POSIX_CLOCK_SELECTION >= 0)
325 /* NOTE: This must be the same clock as the one in mtime.c */
326 pthread_condattr_setclock (&attr, CLOCK_MONOTONIC);
329 ret = pthread_cond_init (p_condvar, &attr);
330 pthread_condattr_destroy (&attr);
333 #elif defined( WIN32 )
334 /* Create a manual-reset event (manual reset is needed for broadcast). */
335 *p_condvar = CreateEvent( NULL, TRUE, FALSE, NULL );
336 return *p_condvar ? 0 : ENOMEM;
342 * Destroys a condition variable. No threads shall be waiting or signaling the
344 * @param p_condvar condition variable to destroy
346 void vlc_cond_destroy (vlc_cond_t *p_condvar)
348 #if defined( LIBVLC_USE_PTHREAD )
349 int val = pthread_cond_destroy( p_condvar );
350 VLC_THREAD_ASSERT ("destroying condition");
352 #elif defined( WIN32 )
353 CloseHandle( *p_condvar );
359 * Wakes up one thread waiting on a condition variable, if any.
360 * @param p_condvar condition variable
362 void vlc_cond_signal (vlc_cond_t *p_condvar)
364 #if defined(LIBVLC_USE_PTHREAD)
365 int val = pthread_cond_signal( p_condvar );
366 VLC_THREAD_ASSERT ("signaling condition variable");
368 #elif defined( WIN32 )
369 /* NOTE: This will cause a broadcast, that is wrong.
370 * This will also wake up the next waiting thread if no thread are yet
371 * waiting, which is also wrong. However both of these issues are allowed
372 * by the provision for spurious wakeups. Better have too many wakeups
373 * than too few (= deadlocks). */
374 SetEvent (*p_condvar);
380 * Wakes up all threads (if any) waiting on a condition variable.
381 * @param p_cond condition variable
383 void vlc_cond_broadcast (vlc_cond_t *p_condvar)
385 #if defined (LIBVLC_USE_PTHREAD)
386 pthread_cond_broadcast (p_condvar);
388 #elif defined (WIN32)
389 SetEvent (*p_condvar);
396 # define WaitForMultipleObjectsEx(a,b,c) WaitForMultipleObjects(a,b)
400 * Waits for a condition variable. The calling thread will be suspended until
401 * another thread calls vlc_cond_signal() or vlc_cond_broadcast() on the same
402 * condition variable, the thread is cancelled with vlc_cancel(), or the
403 * system causes a "spurious" unsolicited wake-up.
405 * A mutex is needed to wait on a condition variable. It must <b>not</b> be
406 * a recursive mutex. Although it is possible to use the same mutex for
407 * multiple condition, it is not valid to use different mutexes for the same
408 * condition variable at the same time from different threads.
410 * In case of thread cancellation, the mutex is always locked before
411 * cancellation proceeds.
413 * The canonical way to use a condition variable to wait for event foobar is:
415 vlc_mutex_lock (&lock);
416 mutex_cleanup_push (&lock); // release the mutex in case of cancellation
419 vlc_cond_wait (&wait, &lock);
421 --- foobar is now true, do something about it here --
423 vlc_cleanup_run (); // release the mutex
426 * @param p_condvar condition variable to wait on
427 * @param p_mutex mutex which is unlocked while waiting,
428 * then locked again when waking up.
429 * @param deadline <b>absolute</b> timeout
431 * @return 0 if the condition was signaled, an error code in case of timeout.
433 void vlc_cond_wait (vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex)
435 #if defined(LIBVLC_USE_PTHREAD)
436 int val = pthread_cond_wait( p_condvar, p_mutex );
437 VLC_THREAD_ASSERT ("waiting on condition");
439 #elif defined( WIN32 )
445 LeaveCriticalSection (&p_mutex->mutex);
446 result = WaitForSingleObjectEx (*p_condvar, INFINITE, TRUE);
447 EnterCriticalSection (&p_mutex->mutex);
449 while (result == WAIT_IO_COMPLETION);
451 ResetEvent (*p_condvar);
457 * Waits for a condition variable up to a certain date.
458 * This works like vlc_cond_wait(), except for the additional timeout.
460 * @param p_condvar condition variable to wait on
461 * @param p_mutex mutex which is unlocked while waiting,
462 * then locked again when waking up.
463 * @param deadline <b>absolute</b> timeout
465 * @return 0 if the condition was signaled, an error code in case of timeout.
467 int vlc_cond_timedwait (vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex,
470 #if defined(LIBVLC_USE_PTHREAD)
471 lldiv_t d = lldiv( deadline, CLOCK_FREQ );
472 struct timespec ts = { d.quot, d.rem * (1000000000 / CLOCK_FREQ) };
474 int val = pthread_cond_timedwait (p_condvar, p_mutex, &ts);
475 if (val != ETIMEDOUT)
476 VLC_THREAD_ASSERT ("timed-waiting on condition");
479 #elif defined( WIN32 )
486 mtime_t total = (deadline - mdate ())/1000;
490 DWORD delay = (total > 0x7fffffff) ? 0x7fffffff : total;
491 LeaveCriticalSection (&p_mutex->mutex);
492 result = WaitForSingleObjectEx (*p_condvar, delay, TRUE);
493 EnterCriticalSection (&p_mutex->mutex);
495 while (result == WAIT_IO_COMPLETION);
497 ResetEvent (*p_condvar);
499 return (result == WAIT_OBJECT_0) ? 0 : ETIMEDOUT;
504 /*****************************************************************************
505 * vlc_tls_create: create a thread-local variable
506 *****************************************************************************/
507 int vlc_threadvar_create( vlc_threadvar_t *p_tls, void (*destr) (void *) )
511 #if defined( LIBVLC_USE_PTHREAD )
512 i_ret = pthread_key_create( p_tls, destr );
513 #elif defined( UNDER_CE )
515 #elif defined( WIN32 )
516 /* FIXME: remember/use the destr() callback and stop leaking whatever */
518 i_ret = (*p_tls == TLS_OUT_OF_INDEXES) ? EAGAIN : 0;
520 # error Unimplemented!
525 void vlc_threadvar_delete (vlc_threadvar_t *p_tls)
527 #if defined( LIBVLC_USE_PTHREAD )
528 pthread_key_delete (*p_tls);
529 #elif defined( UNDER_CE )
530 #elif defined( WIN32 )
533 # error Unimplemented!
537 #if defined (LIBVLC_USE_PTHREAD)
538 #elif defined (WIN32)
539 static unsigned __stdcall vlc_entry (void *data)
541 vlc_cancel_t cancel_data = VLC_CANCEL_INIT;
542 vlc_thread_t self = data;
544 vlc_threadvar_set (&cancel_key, &cancel_data);
545 self->data = self->entry (self->data);
551 * Creates and starts new thread.
553 * @param p_handle [OUT] pointer to write the handle of the created thread to
554 * @param entry entry point for the thread
555 * @param data data parameter given to the entry point
556 * @param priority thread priority value
557 * @return 0 on success, a standard error code on error.
559 int vlc_clone (vlc_thread_t *p_handle, void * (*entry) (void *), void *data,
564 #if defined( LIBVLC_USE_PTHREAD )
566 pthread_attr_init (&attr);
568 /* Block the signals that signals interface plugin handles.
569 * If the LibVLC caller wants to handle some signals by itself, it should
570 * block these before whenever invoking LibVLC. And it must obviously not
571 * start the VLC signals interface plugin.
573 * LibVLC will normally ignore any interruption caused by an asynchronous
574 * signal during a system call. But there may well be some buggy cases
575 * where it fails to handle EINTR (bug reports welcome). Some underlying
576 * libraries might also not handle EINTR properly.
582 sigdelset (&set, SIGHUP);
583 sigaddset (&set, SIGINT);
584 sigaddset (&set, SIGQUIT);
585 sigaddset (&set, SIGTERM);
587 sigaddset (&set, SIGPIPE); /* We don't want this one, really! */
588 pthread_sigmask (SIG_BLOCK, &set, &oldset);
591 struct sched_param sp = { .sched_priority = priority, };
594 if (sp.sched_priority <= 0)
595 sp.sched_priority += sched_get_priority_max (policy = SCHED_OTHER);
597 sp.sched_priority += sched_get_priority_min (policy = SCHED_RR);
599 pthread_attr_setschedpolicy (&attr, policy);
600 pthread_attr_setschedparam (&attr, &sp);
603 /* The thread stack size.
604 * The lower the value, the less address space per thread, the highest
605 * maximum simultaneous threads per process. Too low values will cause
606 * stack overflows and weird crashes. Set with caution. Also keep in mind
607 * that 64-bits platforms consume more stack than 32-bits one.
609 * Thanks to on-demand paging, thread stack size only affects address space
610 * consumption. In terms of memory, threads only use what they need
611 * (rounded up to the page boundary).
613 * For example, on Linux i386, the default is 2 mega-bytes, which supports
614 * about 320 threads per processes. */
615 #define VLC_STACKSIZE (128 * sizeof (void *) * 1024)
618 ret = pthread_attr_setstacksize (&attr, VLC_STACKSIZE);
619 assert (ret == 0); /* fails iif VLC_STACKSIZE is invalid */
622 ret = pthread_create (p_handle, &attr, entry, data);
623 pthread_sigmask (SIG_SETMASK, &oldset, NULL);
624 pthread_attr_destroy (&attr);
626 #elif defined( WIN32 ) || defined( UNDER_CE )
627 /* When using the MSVCRT C library you have to use the _beginthreadex
628 * function instead of CreateThread, otherwise you'll end up with
629 * memory leaks and the signal functions not working (see Microsoft
630 * Knowledge Base, article 104641) */
632 vlc_thread_t th = malloc (sizeof (*th));
639 #if defined( UNDER_CE )
640 hThread = CreateThread (NULL, 0, vlc_entry, th, CREATE_SUSPENDED, NULL);
642 hThread = (HANDLE)(uintptr_t)
643 _beginthreadex (NULL, 0, vlc_entry, th, CREATE_SUSPENDED, NULL);
648 /* Thread closes the handle when exiting, duplicate it here
649 * to be on the safe side when joining. */
650 if (!DuplicateHandle (GetCurrentProcess (), hThread,
651 GetCurrentProcess (), &th->handle, 0, FALSE,
652 DUPLICATE_SAME_ACCESS))
654 CloseHandle (hThread);
659 ResumeThread (hThread);
661 SetThreadPriority (hThread, priority);
677 /* APC procedure for thread cancellation */
678 static void CALLBACK vlc_cancel_self (ULONG_PTR dummy)
681 vlc_control_cancel (VLC_DO_CANCEL);
686 * Marks a thread as cancelled. Next time the target thread reaches a
687 * cancellation point (while not having disabled cancellation), it will
688 * run its cancellation cleanup handler, the thread variable destructors, and
689 * terminate. vlc_join() must be used afterward regardless of a thread being
692 void vlc_cancel (vlc_thread_t thread_id)
694 #if defined (LIBVLC_USE_PTHREAD_CANCEL)
695 pthread_cancel (thread_id);
696 #elif defined (UNDER_CE)
697 /* HACK:There is no way to use something
698 * like QueueUserAPC on Windows CE, so I rely
699 * on some crappy arch specific code */
701 context.ContextFlags = CONTEXT_CONTROL;
702 GetThreadContext (thread_id->handle, &context);
703 /* Setting the instruction pointer for the canceled thread */
704 #if defined(_ARM_) || defined(ARM)
705 context.Pc = (DWORD_PTR) vlc_cancel_self;
707 SetThreadContext (thread_id->handle, &context);
709 #elif defined (WIN32)
710 QueueUserAPC (vlc_cancel_self, thread_id->handle, 0);
712 # warning vlc_cancel is not implemented!
717 * Waits for a thread to complete (if needed), and destroys it.
718 * This is a cancellation point; in case of cancellation, the join does _not_
721 * @param handle thread handle
722 * @param p_result [OUT] pointer to write the thread return value or NULL
723 * @return 0 on success, a standard error code otherwise.
725 void vlc_join (vlc_thread_t handle, void **result)
727 #if defined( LIBVLC_USE_PTHREAD )
728 int val = pthread_join (handle, result);
730 vlc_thread_fatal ("joining thread", val, __func__, __FILE__, __LINE__);
732 #elif defined( UNDER_CE ) || defined( WIN32 )
735 while (WaitForSingleObjectEx (handle->handle, INFINITE, TRUE)
736 == WAIT_IO_COMPLETION);
738 CloseHandle (handle->handle);
740 *result = handle->data;
747 struct vlc_thread_boot
749 void * (*entry) (vlc_object_t *);
750 vlc_object_t *object;
753 static void *thread_entry (void *data)
755 vlc_object_t *obj = ((struct vlc_thread_boot *)data)->object;
756 void *(*func) (vlc_object_t *) = ((struct vlc_thread_boot *)data)->entry;
759 msg_Dbg (obj, "thread started");
761 msg_Dbg (obj, "thread ended");
766 /*****************************************************************************
767 * vlc_thread_create: create a thread, inner version
768 *****************************************************************************
769 * Note that i_priority is only taken into account on platforms supporting
770 * userland real-time priority threads.
771 *****************************************************************************/
772 int __vlc_thread_create( vlc_object_t *p_this, const char * psz_file, int i_line,
773 const char *psz_name, void * ( *func ) ( vlc_object_t * ),
774 int i_priority, bool b_wait )
777 vlc_object_internals_t *p_priv = vlc_internals( p_this );
779 struct vlc_thread_boot *boot = malloc (sizeof (*boot));
783 boot->object = p_this;
785 /* Make sure we don't re-create a thread if the object has already one */
786 assert( !p_priv->b_thread );
788 #if defined( LIBVLC_USE_PTHREAD )
790 sem_init (&p_priv->thread_ready, 0, 0);
792 if( config_GetInt( p_this, "rt-priority" ) > 0 )
795 /* Hack to avoid error msg */
796 if( config_GetType( p_this, "rt-offset" ) )
797 i_priority += config_GetInt( p_this, "rt-offset" );
799 #elif defined (WIN32)
801 p_priv->thread_ready = CreateEvent (NULL, TRUE, FALSE, NULL);
804 p_priv->b_thread = true;
805 i_ret = vlc_clone( &p_priv->thread_id, thread_entry, boot, i_priority );
808 msg_Dbg( p_this, "thread %lu (%s) created at priority %d (%s:%d)",
809 (unsigned long)p_priv->thread_id, psz_name, i_priority,
813 msg_Dbg( p_this, "waiting for thread initialization" );
814 #if defined (LIBVLC_USE_PTHREAD)
815 sem_wait (&p_priv->thread_ready);
816 sem_destroy (&p_priv->thread_ready);
817 #elif defined (WIN32)
818 WaitForSingleObject (p_priv->thread_ready, INFINITE);
819 CloseHandle (p_priv->thread_ready);
825 p_priv->b_thread = false;
827 msg_Err( p_this, "%s thread could not be created at %s:%d (%m)",
828 psz_name, psz_file, i_line );
834 #undef vlc_thread_ready
835 void vlc_thread_ready (vlc_object_t *obj)
837 vlc_object_internals_t *priv = vlc_internals (obj);
839 assert (priv->b_thread);
840 #if defined (LIBVLC_USE_PTHREAD)
841 assert (pthread_equal (pthread_self (), priv->thread_id));
842 sem_post (&priv->thread_ready);
843 #elif defined (WIN32)
844 SetEvent (priv->thread_ready);
848 /*****************************************************************************
849 * vlc_thread_set_priority: set the priority of the current thread when we
850 * couldn't set it in vlc_thread_create (for instance for the main thread)
851 *****************************************************************************/
852 int __vlc_thread_set_priority( vlc_object_t *p_this, const char * psz_file,
853 int i_line, int i_priority )
855 vlc_object_internals_t *p_priv = vlc_internals( p_this );
857 if( !p_priv->b_thread )
859 msg_Err( p_this, "couldn't set priority of non-existent thread" );
863 #if defined( LIBVLC_USE_PTHREAD )
865 if( config_GetInt( p_this, "rt-priority" ) > 0 )
868 int i_error, i_policy;
869 struct sched_param param;
871 memset( ¶m, 0, sizeof(struct sched_param) );
872 if( config_GetType( p_this, "rt-offset" ) )
873 i_priority += config_GetInt( p_this, "rt-offset" );
874 if( i_priority <= 0 )
876 param.sched_priority = (-1) * i_priority;
877 i_policy = SCHED_OTHER;
881 param.sched_priority = i_priority;
884 if( (i_error = pthread_setschedparam( p_priv->thread_id,
885 i_policy, ¶m )) )
888 msg_Warn( p_this, "couldn't set thread priority (%s:%d): %m",
894 #elif defined( WIN32 ) || defined( UNDER_CE )
895 VLC_UNUSED( psz_file); VLC_UNUSED( i_line );
897 if( !SetThreadPriority(p_priv->thread_id->handle, i_priority) )
899 msg_Warn( p_this, "couldn't set a faster priority" );
908 /*****************************************************************************
909 * vlc_thread_join: wait until a thread exits, inner version
910 *****************************************************************************/
911 void __vlc_thread_join( vlc_object_t *p_this )
913 vlc_object_internals_t *p_priv = vlc_internals( p_this );
915 #if defined( LIBVLC_USE_PTHREAD )
916 vlc_join (p_priv->thread_id, NULL);
918 #elif defined( UNDER_CE ) || defined( WIN32 )
920 FILETIME create_ft, exit_ft, kernel_ft, user_ft;
921 int64_t real_time, kernel_time, user_time;
923 if( ! DuplicateHandle(GetCurrentProcess(),
924 p_priv->thread_id->handle,
929 DUPLICATE_SAME_ACCESS) )
931 p_priv->b_thread = false;
932 return; /* We have a problem! */
935 vlc_join( p_priv->thread_id, NULL );
937 if( GetThreadTimes( hThread, &create_ft, &exit_ft, &kernel_ft, &user_ft ) )
940 ((((int64_t)exit_ft.dwHighDateTime)<<32)| exit_ft.dwLowDateTime) -
941 ((((int64_t)create_ft.dwHighDateTime)<<32)| create_ft.dwLowDateTime);
945 ((((int64_t)kernel_ft.dwHighDateTime)<<32)|
946 kernel_ft.dwLowDateTime) / 10;
949 ((((int64_t)user_ft.dwHighDateTime)<<32)|
950 user_ft.dwLowDateTime) / 10;
952 msg_Dbg( p_this, "thread times: "
953 "real %"PRId64"m%fs, kernel %"PRId64"m%fs, user %"PRId64"m%fs",
954 real_time/60/1000000,
955 (double)((real_time%(60*1000000))/1000000.0),
956 kernel_time/60/1000000,
957 (double)((kernel_time%(60*1000000))/1000000.0),
958 user_time/60/1000000,
959 (double)((user_time%(60*1000000))/1000000.0) );
961 CloseHandle( hThread );
964 vlc_join( p_priv->thread_id, NULL );
968 p_priv->b_thread = false;
971 void vlc_thread_cancel (vlc_object_t *obj)
973 vlc_object_internals_t *priv = vlc_internals (obj);
976 vlc_cancel (priv->thread_id);
979 void vlc_control_cancel (int cmd, ...)
981 /* NOTE: This function only modifies thread-specific data, so there is no
982 * need to lock anything. */
983 #ifdef LIBVLC_USE_PTHREAD_CANCEL
989 vlc_cancel_t *nfo = vlc_threadvar_get (&cancel_key);
993 /* Main thread - cannot be cancelled anyway */
996 nfo = malloc (sizeof (*nfo));
998 return; /* Uho! Expect problems! */
999 *nfo = VLC_CANCEL_INIT;
1000 vlc_threadvar_set (&cancel_key, nfo);
1007 case VLC_SAVE_CANCEL:
1009 int *p_state = va_arg (ap, int *);
1010 *p_state = nfo->killable;
1011 nfo->killable = false;
1015 case VLC_RESTORE_CANCEL:
1017 int state = va_arg (ap, int);
1018 nfo->killable = state != 0;
1022 case VLC_TEST_CANCEL:
1023 if (nfo->killable && nfo->killed)
1025 for (vlc_cleanup_t *p = nfo->cleaners; p != NULL; p = p->next)
1030 #if defined (LIBVLC_USE_PTHREAD)
1031 pthread_exit (PTHREAD_CANCELLED);
1032 #elif defined (UNDER_CE)
1034 #elif defined (WIN32)
1037 # error Not implemented!
1046 case VLC_CLEANUP_PUSH:
1048 /* cleaner is a pointer to the caller stack, no need to allocate
1049 * and copy anything. As a nice side effect, this cannot fail. */
1050 vlc_cleanup_t *cleaner = va_arg (ap, vlc_cleanup_t *);
1051 cleaner->next = nfo->cleaners;
1052 nfo->cleaners = cleaner;
1056 case VLC_CLEANUP_POP:
1058 nfo->cleaners = nfo->cleaners->next;