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 * Print a backtrace to the standard error for debugging purpose.
55 void vlc_trace (const char *fn, const char *file, unsigned line)
57 fprintf (stderr, "at %s:%u in %s\n", file, line, fn);
58 fflush (stderr); /* needed before switch to low-level I/O */
61 int len = backtrace (stack, sizeof (stack) / sizeof (stack[0]));
62 backtrace_symbols_fd (stack, len, 2);
69 static inline unsigned long vlc_threadid (void)
71 #if defined(LIBVLC_USE_PTHREAD)
72 union { pthread_t th; unsigned long int i; } v = { };
73 v.th = pthread_self ();
77 return GetCurrentThreadId ();
85 /*****************************************************************************
86 * vlc_thread_fatal: Report an error from the threading layer
87 *****************************************************************************
88 * This is mostly meant for debugging.
89 *****************************************************************************/
91 vlc_thread_fatal (const char *action, int error,
92 const char *function, const char *file, unsigned line)
94 fprintf (stderr, "LibVLC fatal error %s (%d) in thread %lu ",
95 action, error, vlc_threadid ());
96 vlc_trace (function, file, line);
98 /* Sometimes strerror_r() crashes too, so make sure we print an error
99 * message before we invoke it */
101 /* Avoid the strerror_r() prototype brain damage in glibc */
103 fprintf (stderr, " Error message: %m\n");
104 #elif !defined (WIN32)
108 switch (strerror_r (error, buf, sizeof (buf)))
113 case ERANGE: /* should never happen */
114 msg = "unknwon (too big to display)";
117 msg = "unknown (invalid error number)";
120 fprintf (stderr, " Error message: %s\n", msg);
128 # define VLC_THREAD_ASSERT( action ) \
129 if (val) vlc_thread_fatal (action, val, __func__, __FILE__, __LINE__)
131 # define VLC_THREAD_ASSERT( action ) ((void)val)
135 * Per-thread cancellation data
137 #ifndef LIBVLC_USE_PTHREAD_CANCEL
138 typedef struct vlc_cancel_t
140 vlc_cleanup_t *cleaners;
149 # define VLC_CANCEL_INIT { NULL, true, false }
151 # define VLC_CANCEL_INIT { NULL, true, false, NULL }
156 static void CALLBACK vlc_cancel_self (ULONG_PTR dummy);
158 static DWORD vlc_cancelable_wait (DWORD count, const HANDLE *handles,
161 vlc_cancel_t *nfo = vlc_threadvar_get (&cancel_key);
164 /* Main thread - cannot be cancelled anyway */
165 return WaitForMultipleObjects (count, handles, FALSE, delay);
167 HANDLE new_handles[count + 1];
168 memcpy(new_handles, handles, count * sizeof(HANDLE));
169 new_handles[count] = nfo->cancel_event;
170 DWORD result = WaitForMultipleObjects (count + 1, new_handles, FALSE,
172 if (result == WAIT_OBJECT_0 + count)
174 vlc_cancel_self (NULL);
175 return WAIT_IO_COMPLETION;
183 DWORD SleepEx (DWORD dwMilliseconds, BOOL bAlertable)
187 DWORD result = vlc_cancelable_wait (0, NULL, dwMilliseconds);
188 return (result == WAIT_TIMEOUT) ? 0 : WAIT_IO_COMPLETION;
192 Sleep(dwMilliseconds);
197 DWORD WaitForSingleObjectEx (HANDLE hHandle, DWORD dwMilliseconds,
202 /* The MSDN documentation specifies different return codes,
203 * but in practice they are the same. We just check that it
205 #if WAIT_ABANDONED != WAIT_ABANDONED_0
206 # error Windows headers changed, code needs to be rewritten!
208 return vlc_cancelable_wait (1, &hHandle, dwMilliseconds);
212 return WaitForSingleObject (hHandle, dwMilliseconds);
216 DWORD WaitForMultipleObjectsEx (DWORD nCount, const HANDLE *lpHandles,
217 BOOL bWaitAll, DWORD dwMilliseconds,
222 /* We do not support the bWaitAll case */
224 return vlc_cancelable_wait (nCount, lpHandles, dwMilliseconds);
228 return WaitForMultipleObjects (nCount, lpHandles, bWaitAll,
235 static vlc_mutex_t super_mutex;
237 BOOL WINAPI DllMain (HINSTANCE hinstDll, DWORD fdwReason, LPVOID lpvReserved)
244 case DLL_PROCESS_ATTACH:
245 vlc_mutex_init (&super_mutex);
246 vlc_threadvar_create (&cancel_key, free);
249 case DLL_PROCESS_DETACH:
250 vlc_threadvar_delete( &cancel_key );
251 vlc_mutex_destroy (&super_mutex);
258 #if defined (__GLIBC__) && (__GLIBC_MINOR__ < 6)
259 /* This is not prototyped under glibc, though it exists. */
260 int pthread_mutexattr_setkind_np( pthread_mutexattr_t *attr, int kind );
263 /*****************************************************************************
264 * vlc_mutex_init: initialize a mutex
265 *****************************************************************************/
266 int vlc_mutex_init( vlc_mutex_t *p_mutex )
268 #if defined( LIBVLC_USE_PTHREAD )
269 pthread_mutexattr_t attr;
272 pthread_mutexattr_init( &attr );
275 /* Create error-checking mutex to detect problems more easily. */
276 # if defined (__GLIBC__) && (__GLIBC_MINOR__ < 6)
277 pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_ERRORCHECK_NP );
279 pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_ERRORCHECK );
282 i_result = pthread_mutex_init( p_mutex, &attr );
283 pthread_mutexattr_destroy( &attr );
286 #elif defined( WIN32 )
287 /* This creates a recursive mutex. This is OK as fast mutexes have
288 * no defined behavior in case of recursive locking. */
289 InitializeCriticalSection (&p_mutex->mutex);
290 p_mutex->initialized = 1;
296 /*****************************************************************************
297 * vlc_mutex_init: initialize a recursive mutex (Do not use)
298 *****************************************************************************/
299 int vlc_mutex_init_recursive( vlc_mutex_t *p_mutex )
301 #if defined( LIBVLC_USE_PTHREAD )
302 pthread_mutexattr_t attr;
305 pthread_mutexattr_init( &attr );
306 # if defined (__GLIBC__) && (__GLIBC_MINOR__ < 6)
307 pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_RECURSIVE_NP );
309 pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_RECURSIVE );
311 i_result = pthread_mutex_init( p_mutex, &attr );
312 pthread_mutexattr_destroy( &attr );
315 #elif defined( WIN32 )
316 InitializeCriticalSection( &p_mutex->mutex );
317 p_mutex->initialized = 1;
325 * Destroys a mutex. The mutex must not be locked.
327 * @param p_mutex mutex to destroy
328 * @return always succeeds
330 void vlc_mutex_destroy (vlc_mutex_t *p_mutex)
332 #if defined( LIBVLC_USE_PTHREAD )
333 int val = pthread_mutex_destroy( p_mutex );
334 VLC_THREAD_ASSERT ("destroying mutex");
336 #elif defined( WIN32 )
337 assert (InterlockedExchange (&p_mutex->initialized, -1) == 1);
338 DeleteCriticalSection (&p_mutex->mutex);
344 * Acquires a mutex. If needed, waits for any other thread to release it.
345 * Beware of deadlocks when locking multiple mutexes at the same time,
346 * or when using mutexes from callbacks.
348 * @param p_mutex mutex initialized with vlc_mutex_init() or
349 * vlc_mutex_init_recursive()
351 void vlc_mutex_lock (vlc_mutex_t *p_mutex)
353 #if defined(LIBVLC_USE_PTHREAD)
354 int val = pthread_mutex_lock( p_mutex );
355 VLC_THREAD_ASSERT ("locking mutex");
357 #elif defined( WIN32 )
358 if (InterlockedCompareExchange (&p_mutex->initialized, 0, 0) == 0)
359 { /* ^^ We could also lock super_mutex all the time... sluggish */
360 assert (p_mutex != &super_mutex); /* this one cannot be static */
362 vlc_mutex_lock (&super_mutex);
363 vlc_mutex_init (p_mutex);
364 /* FIXME: destroy the mutex some time... */
365 vlc_mutex_unlock (&super_mutex);
367 assert (InterlockedExchange (&p_mutex->initialized, 1) == 1);
368 EnterCriticalSection (&p_mutex->mutex);
375 * Releases a mutex (or crashes if the mutex is not locked by the caller).
376 * @param p_mutex mutex locked with vlc_mutex_lock().
378 void vlc_mutex_unlock (vlc_mutex_t *p_mutex)
380 #if defined(LIBVLC_USE_PTHREAD)
381 int val = pthread_mutex_unlock( p_mutex );
382 VLC_THREAD_ASSERT ("unlocking mutex");
384 #elif defined( WIN32 )
385 assert (InterlockedExchange (&p_mutex->initialized, 1) == 1);
386 LeaveCriticalSection (&p_mutex->mutex);
391 /*****************************************************************************
392 * vlc_cond_init: initialize a condition variable
393 *****************************************************************************/
394 int vlc_cond_init( vlc_cond_t *p_condvar )
396 #if defined( LIBVLC_USE_PTHREAD )
397 pthread_condattr_t attr;
400 ret = pthread_condattr_init (&attr);
404 # if !defined (_POSIX_CLOCK_SELECTION)
405 /* Fairly outdated POSIX support (that was defined in 2001) */
406 # define _POSIX_CLOCK_SELECTION (-1)
408 # if (_POSIX_CLOCK_SELECTION >= 0)
409 /* NOTE: This must be the same clock as the one in mtime.c */
410 pthread_condattr_setclock (&attr, CLOCK_MONOTONIC);
413 ret = pthread_cond_init (p_condvar, &attr);
414 pthread_condattr_destroy (&attr);
417 #elif defined( WIN32 )
418 /* Create a manual-reset event (manual reset is needed for broadcast). */
419 *p_condvar = CreateEvent( NULL, TRUE, FALSE, NULL );
420 return *p_condvar ? 0 : ENOMEM;
426 * Destroys a condition variable. No threads shall be waiting or signaling the
428 * @param p_condvar condition variable to destroy
430 void vlc_cond_destroy (vlc_cond_t *p_condvar)
432 #if defined( LIBVLC_USE_PTHREAD )
433 int val = pthread_cond_destroy( p_condvar );
434 VLC_THREAD_ASSERT ("destroying condition");
436 #elif defined( WIN32 )
437 CloseHandle( *p_condvar );
443 * Wakes up one thread waiting on a condition variable, if any.
444 * @param p_condvar condition variable
446 void vlc_cond_signal (vlc_cond_t *p_condvar)
448 #if defined(LIBVLC_USE_PTHREAD)
449 int val = pthread_cond_signal( p_condvar );
450 VLC_THREAD_ASSERT ("signaling condition variable");
452 #elif defined( WIN32 )
453 /* NOTE: This will cause a broadcast, that is wrong.
454 * This will also wake up the next waiting thread if no thread are yet
455 * waiting, which is also wrong. However both of these issues are allowed
456 * by the provision for spurious wakeups. Better have too many wakeups
457 * than too few (= deadlocks). */
458 SetEvent (*p_condvar);
464 * Wakes up all threads (if any) waiting on a condition variable.
465 * @param p_cond condition variable
467 void vlc_cond_broadcast (vlc_cond_t *p_condvar)
469 #if defined (LIBVLC_USE_PTHREAD)
470 pthread_cond_broadcast (p_condvar);
472 #elif defined (WIN32)
473 SetEvent (*p_condvar);
479 * Waits for a condition variable. The calling thread will be suspended until
480 * another thread calls vlc_cond_signal() or vlc_cond_broadcast() on the same
481 * condition variable, the thread is cancelled with vlc_cancel(), or the
482 * system causes a "spurious" unsolicited wake-up.
484 * A mutex is needed to wait on a condition variable. It must <b>not</b> be
485 * a recursive mutex. Although it is possible to use the same mutex for
486 * multiple condition, it is not valid to use different mutexes for the same
487 * condition variable at the same time from different threads.
489 * In case of thread cancellation, the mutex is always locked before
490 * cancellation proceeds.
492 * The canonical way to use a condition variable to wait for event foobar is:
494 vlc_mutex_lock (&lock);
495 mutex_cleanup_push (&lock); // release the mutex in case of cancellation
498 vlc_cond_wait (&wait, &lock);
500 --- foobar is now true, do something about it here --
502 vlc_cleanup_run (); // release the mutex
505 * @param p_condvar condition variable to wait on
506 * @param p_mutex mutex which is unlocked while waiting,
507 * then locked again when waking up.
508 * @param deadline <b>absolute</b> timeout
510 * @return 0 if the condition was signaled, an error code in case of timeout.
512 void vlc_cond_wait (vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex)
514 #if defined(LIBVLC_USE_PTHREAD)
515 int val = pthread_cond_wait( p_condvar, p_mutex );
516 VLC_THREAD_ASSERT ("waiting on condition");
518 #elif defined( WIN32 )
524 LeaveCriticalSection (&p_mutex->mutex);
525 result = WaitForSingleObjectEx (*p_condvar, INFINITE, TRUE);
526 EnterCriticalSection (&p_mutex->mutex);
528 while (result == WAIT_IO_COMPLETION);
530 ResetEvent (*p_condvar);
536 * Waits for a condition variable up to a certain date.
537 * This works like vlc_cond_wait(), except for the additional timeout.
539 * @param p_condvar condition variable to wait on
540 * @param p_mutex mutex which is unlocked while waiting,
541 * then locked again when waking up.
542 * @param deadline <b>absolute</b> timeout
544 * @return 0 if the condition was signaled, an error code in case of timeout.
546 int vlc_cond_timedwait (vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex,
549 #if defined(LIBVLC_USE_PTHREAD)
550 lldiv_t d = lldiv( deadline, CLOCK_FREQ );
551 struct timespec ts = { d.quot, d.rem * (1000000000 / CLOCK_FREQ) };
553 int val = pthread_cond_timedwait (p_condvar, p_mutex, &ts);
554 if (val != ETIMEDOUT)
555 VLC_THREAD_ASSERT ("timed-waiting on condition");
558 #elif defined( WIN32 )
565 mtime_t total = (deadline - mdate ())/1000;
569 DWORD delay = (total > 0x7fffffff) ? 0x7fffffff : total;
570 LeaveCriticalSection (&p_mutex->mutex);
571 result = WaitForSingleObjectEx (*p_condvar, delay, TRUE);
572 EnterCriticalSection (&p_mutex->mutex);
574 while (result == WAIT_IO_COMPLETION);
576 ResetEvent (*p_condvar);
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( WIN32 )
593 /* FIXME: remember/use the destr() callback and stop leaking whatever */
595 i_ret = (*p_tls == TLS_OUT_OF_INDEXES) ? EAGAIN : 0;
597 # error Unimplemented!
602 void vlc_threadvar_delete (vlc_threadvar_t *p_tls)
604 #if defined( LIBVLC_USE_PTHREAD )
605 pthread_key_delete (*p_tls);
606 #elif defined( WIN32 )
609 # error Unimplemented!
613 #if defined (LIBVLC_USE_PTHREAD)
614 #elif defined (WIN32)
615 static unsigned __stdcall vlc_entry (void *data)
617 vlc_cancel_t cancel_data = VLC_CANCEL_INIT;
618 vlc_thread_t self = data;
620 cancel_data.cancel_event = self->cancel_event;
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 /* The thread stack size.
683 * The lower the value, the less address space per thread, the highest
684 * maximum simultaneous threads per process. Too low values will cause
685 * stack overflows and weird crashes. Set with caution. Also keep in mind
686 * that 64-bits platforms consume more stack than 32-bits one.
688 * Thanks to on-demand paging, thread stack size only affects address space
689 * consumption. In terms of memory, threads only use what they need
690 * (rounded up to the page boundary).
692 * For example, on Linux i386, the default is 2 mega-bytes, which supports
693 * about 320 threads per processes. */
694 #define VLC_STACKSIZE (128 * sizeof (void *) * 1024)
697 ret = pthread_attr_setstacksize (&attr, VLC_STACKSIZE);
698 assert (ret == 0); /* fails iif VLC_STACKSIZE is invalid */
701 ret = pthread_create (p_handle, &attr, entry, data);
702 pthread_sigmask (SIG_SETMASK, &oldset, NULL);
703 pthread_attr_destroy (&attr);
705 #elif defined( WIN32 ) || defined( UNDER_CE )
706 /* When using the MSVCRT C library you have to use the _beginthreadex
707 * function instead of CreateThread, otherwise you'll end up with
708 * memory leaks and the signal functions not working (see Microsoft
709 * Knowledge Base, article 104641) */
711 vlc_thread_t th = malloc (sizeof (*th));
718 #if defined( UNDER_CE )
719 th->cancel_event = CreateEvent (NULL, FALSE, FALSE, NULL);
720 if (th->cancel_event == NULL)
725 hThread = CreateThread (NULL, 0, vlc_entry, th, CREATE_SUSPENDED, NULL);
727 hThread = (HANDLE)(uintptr_t)
728 _beginthreadex (NULL, 0, vlc_entry, th, CREATE_SUSPENDED, NULL);
734 /* Thread closes the handle when exiting, duplicate it here
735 * to be on the safe side when joining. */
736 if (!DuplicateHandle (GetCurrentProcess (), hThread,
737 GetCurrentProcess (), &th->handle, 0, FALSE,
738 DUPLICATE_SAME_ACCESS))
740 CloseHandle (hThread);
745 th->handle = hThread;
748 ResumeThread (hThread);
750 SetThreadPriority (hThread, priority);
766 /* APC procedure for thread cancellation */
767 static void CALLBACK vlc_cancel_self (ULONG_PTR dummy)
770 vlc_control_cancel (VLC_DO_CANCEL);
775 * Marks a thread as cancelled. Next time the target thread reaches a
776 * cancellation point (while not having disabled cancellation), it will
777 * run its cancellation cleanup handler, the thread variable destructors, and
778 * terminate. vlc_join() must be used afterward regardless of a thread being
781 void vlc_cancel (vlc_thread_t thread_id)
783 #if defined (LIBVLC_USE_PTHREAD_CANCEL)
784 pthread_cancel (thread_id);
785 #elif defined (UNDER_CE)
786 SetEvent (thread_id->cancel_event);
787 #elif defined (WIN32)
788 QueueUserAPC (vlc_cancel_self, thread_id->handle, 0);
790 # warning vlc_cancel is not implemented!
795 * Waits for a thread to complete (if needed), and destroys it.
796 * This is a cancellation point; in case of cancellation, the join does _not_
799 * @param handle thread handle
800 * @param p_result [OUT] pointer to write the thread return value or NULL
801 * @return 0 on success, a standard error code otherwise.
803 void vlc_join (vlc_thread_t handle, void **result)
805 #if defined( LIBVLC_USE_PTHREAD )
806 int val = pthread_join (handle, result);
808 vlc_thread_fatal ("joining thread", val, __func__, __FILE__, __LINE__);
810 #elif defined( UNDER_CE ) || defined( WIN32 )
813 while (WaitForSingleObjectEx (handle->handle, INFINITE, TRUE)
814 == WAIT_IO_COMPLETION);
816 CloseHandle (handle->handle);
818 *result = handle->data;
819 #if defined( UNDER_CE )
820 CloseHandle (handle->cancel_event);
828 struct vlc_thread_boot
830 void * (*entry) (vlc_object_t *);
831 vlc_object_t *object;
834 static void *thread_entry (void *data)
836 vlc_object_t *obj = ((struct vlc_thread_boot *)data)->object;
837 void *(*func) (vlc_object_t *) = ((struct vlc_thread_boot *)data)->entry;
840 msg_Dbg (obj, "thread started");
842 msg_Dbg (obj, "thread ended");
847 /*****************************************************************************
848 * vlc_thread_create: create a thread, inner version
849 *****************************************************************************
850 * Note that i_priority is only taken into account on platforms supporting
851 * userland real-time priority threads.
852 *****************************************************************************/
853 int __vlc_thread_create( vlc_object_t *p_this, const char * psz_file, int i_line,
854 const char *psz_name, void * ( *func ) ( vlc_object_t * ),
855 int i_priority, bool b_wait )
858 vlc_object_internals_t *p_priv = vlc_internals( p_this );
860 struct vlc_thread_boot *boot = malloc (sizeof (*boot));
864 boot->object = p_this;
866 /* Make sure we don't re-create a thread if the object has already one */
867 assert( !p_priv->b_thread );
869 #if defined( LIBVLC_USE_PTHREAD )
871 sem_init (&p_priv->thread_ready, 0, 0);
873 if( config_GetInt( p_this, "rt-priority" ) > 0 )
876 /* Hack to avoid error msg */
877 if( config_GetType( p_this, "rt-offset" ) )
878 i_priority += config_GetInt( p_this, "rt-offset" );
880 #elif defined (WIN32)
882 p_priv->thread_ready = CreateEvent (NULL, TRUE, FALSE, NULL);
885 p_priv->b_thread = true;
886 i_ret = vlc_clone( &p_priv->thread_id, thread_entry, boot, i_priority );
889 msg_Dbg( p_this, "thread (%s) created at priority %d (%s:%d)",
890 psz_name, i_priority, psz_file, i_line );
893 msg_Dbg( p_this, "waiting for thread initialization" );
894 #if defined (LIBVLC_USE_PTHREAD)
895 sem_wait (&p_priv->thread_ready);
896 sem_destroy (&p_priv->thread_ready);
897 #elif defined (WIN32)
898 WaitForSingleObject (p_priv->thread_ready, INFINITE);
899 CloseHandle (p_priv->thread_ready);
905 p_priv->b_thread = false;
907 msg_Err( p_this, "%s thread could not be created at %s:%d (%m)",
908 psz_name, psz_file, i_line );
914 #undef vlc_thread_ready
915 void vlc_thread_ready (vlc_object_t *obj)
917 vlc_object_internals_t *priv = vlc_internals (obj);
919 assert (priv->b_thread);
920 #if defined (LIBVLC_USE_PTHREAD)
921 assert (pthread_equal (pthread_self (), priv->thread_id));
922 sem_post (&priv->thread_ready);
923 #elif defined (WIN32)
924 SetEvent (priv->thread_ready);
928 /*****************************************************************************
929 * vlc_thread_set_priority: set the priority of the current thread when we
930 * couldn't set it in vlc_thread_create (for instance for the main thread)
931 *****************************************************************************/
932 int __vlc_thread_set_priority( vlc_object_t *p_this, const char * psz_file,
933 int i_line, int i_priority )
935 vlc_object_internals_t *p_priv = vlc_internals( p_this );
937 if( !p_priv->b_thread )
939 msg_Err( p_this, "couldn't set priority of non-existent thread" );
943 #if defined( LIBVLC_USE_PTHREAD )
945 if( config_GetInt( p_this, "rt-priority" ) > 0 )
948 int i_error, i_policy;
949 struct sched_param param;
951 memset( ¶m, 0, sizeof(struct sched_param) );
952 if( config_GetType( p_this, "rt-offset" ) )
953 i_priority += config_GetInt( p_this, "rt-offset" );
954 if( i_priority <= 0 )
956 param.sched_priority = (-1) * i_priority;
957 i_policy = SCHED_OTHER;
961 param.sched_priority = i_priority;
964 if( (i_error = pthread_setschedparam( p_priv->thread_id,
965 i_policy, ¶m )) )
968 msg_Warn( p_this, "couldn't set thread priority (%s:%d): %m",
974 #elif defined( WIN32 ) || defined( UNDER_CE )
975 VLC_UNUSED( psz_file); VLC_UNUSED( i_line );
977 if( !SetThreadPriority(p_priv->thread_id->handle, i_priority) )
979 msg_Warn( p_this, "couldn't set a faster priority" );
988 /*****************************************************************************
989 * vlc_thread_join: wait until a thread exits, inner version
990 *****************************************************************************/
991 void __vlc_thread_join( vlc_object_t *p_this )
993 vlc_object_internals_t *p_priv = vlc_internals( p_this );
995 #if defined( LIBVLC_USE_PTHREAD )
996 vlc_join (p_priv->thread_id, NULL);
998 #elif defined( UNDER_CE ) || defined( WIN32 )
1000 FILETIME create_ft, exit_ft, kernel_ft, user_ft;
1001 int64_t real_time, kernel_time, user_time;
1004 if( ! DuplicateHandle(GetCurrentProcess(),
1005 p_priv->thread_id->handle,
1006 GetCurrentProcess(),
1010 DUPLICATE_SAME_ACCESS) )
1012 p_priv->b_thread = false;
1013 return; /* We have a problem! */
1016 hThread = p_priv->thread_id->handle;
1019 vlc_join( p_priv->thread_id, NULL );
1021 if( GetThreadTimes( hThread, &create_ft, &exit_ft, &kernel_ft, &user_ft ) )
1024 ((((int64_t)exit_ft.dwHighDateTime)<<32)| exit_ft.dwLowDateTime) -
1025 ((((int64_t)create_ft.dwHighDateTime)<<32)| create_ft.dwLowDateTime);
1029 ((((int64_t)kernel_ft.dwHighDateTime)<<32)|
1030 kernel_ft.dwLowDateTime) / 10;
1033 ((((int64_t)user_ft.dwHighDateTime)<<32)|
1034 user_ft.dwLowDateTime) / 10;
1036 msg_Dbg( p_this, "thread times: "
1037 "real %"PRId64"m%fs, kernel %"PRId64"m%fs, user %"PRId64"m%fs",
1038 real_time/60/1000000,
1039 (double)((real_time%(60*1000000))/1000000.0),
1040 kernel_time/60/1000000,
1041 (double)((kernel_time%(60*1000000))/1000000.0),
1042 user_time/60/1000000,
1043 (double)((user_time%(60*1000000))/1000000.0) );
1045 CloseHandle( hThread );
1048 vlc_join( p_priv->thread_id, NULL );
1052 p_priv->b_thread = false;
1055 void vlc_thread_cancel (vlc_object_t *obj)
1057 vlc_object_internals_t *priv = vlc_internals (obj);
1060 vlc_cancel (priv->thread_id);
1063 void vlc_control_cancel (int cmd, ...)
1065 /* NOTE: This function only modifies thread-specific data, so there is no
1066 * need to lock anything. */
1067 #ifdef LIBVLC_USE_PTHREAD_CANCEL
1073 vlc_cancel_t *nfo = vlc_threadvar_get (&cancel_key);
1077 /* Main thread - cannot be cancelled anyway */
1080 nfo = malloc (sizeof (*nfo));
1082 return; /* Uho! Expect problems! */
1083 *nfo = VLC_CANCEL_INIT;
1084 vlc_threadvar_set (&cancel_key, nfo);
1091 case VLC_SAVE_CANCEL:
1093 int *p_state = va_arg (ap, int *);
1094 *p_state = nfo->killable;
1095 nfo->killable = false;
1099 case VLC_RESTORE_CANCEL:
1101 int state = va_arg (ap, int);
1102 nfo->killable = state != 0;
1106 case VLC_TEST_CANCEL:
1107 if (nfo->killable && nfo->killed)
1109 for (vlc_cleanup_t *p = nfo->cleaners; p != NULL; p = p->next)
1114 #if defined (LIBVLC_USE_PTHREAD)
1115 pthread_exit (PTHREAD_CANCELLED);
1116 #elif defined (UNDER_CE)
1118 #elif defined (WIN32)
1121 # error Not implemented!
1130 case VLC_CLEANUP_PUSH:
1132 /* cleaner is a pointer to the caller stack, no need to allocate
1133 * and copy anything. As a nice side effect, this cannot fail. */
1134 vlc_cleanup_t *cleaner = va_arg (ap, vlc_cleanup_t *);
1135 cleaner->next = nfo->cleaners;
1136 nfo->cleaners = cleaner;
1140 case VLC_CLEANUP_POP:
1142 nfo->cleaners = nfo->cleaners->next;