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 if (InterlockedCompareExchange (&p_mutex->initialized, 0, 0) == 0)
364 vlc_mutex_init (p_mutex);
365 /* FIXME: destroy the mutex some time... */
366 vlc_mutex_unlock (&super_mutex);
368 assert (InterlockedExchange (&p_mutex->initialized, 1) == 1);
369 EnterCriticalSection (&p_mutex->mutex);
376 * Releases a mutex (or crashes if the mutex is not locked by the caller).
377 * @param p_mutex mutex locked with vlc_mutex_lock().
379 void vlc_mutex_unlock (vlc_mutex_t *p_mutex)
381 #if defined(LIBVLC_USE_PTHREAD)
382 int val = pthread_mutex_unlock( p_mutex );
383 VLC_THREAD_ASSERT ("unlocking mutex");
385 #elif defined( WIN32 )
386 assert (InterlockedExchange (&p_mutex->initialized, 1) == 1);
387 LeaveCriticalSection (&p_mutex->mutex);
392 /*****************************************************************************
393 * vlc_cond_init: initialize a condition variable
394 *****************************************************************************/
395 int vlc_cond_init( vlc_cond_t *p_condvar )
397 #if defined( LIBVLC_USE_PTHREAD )
398 pthread_condattr_t attr;
401 ret = pthread_condattr_init (&attr);
405 # if !defined (_POSIX_CLOCK_SELECTION)
406 /* Fairly outdated POSIX support (that was defined in 2001) */
407 # define _POSIX_CLOCK_SELECTION (-1)
409 # if (_POSIX_CLOCK_SELECTION >= 0)
410 /* NOTE: This must be the same clock as the one in mtime.c */
411 pthread_condattr_setclock (&attr, CLOCK_MONOTONIC);
414 ret = pthread_cond_init (p_condvar, &attr);
415 pthread_condattr_destroy (&attr);
418 #elif defined( WIN32 )
419 /* Create a manual-reset event (manual reset is needed for broadcast). */
420 *p_condvar = CreateEvent( NULL, TRUE, FALSE, NULL );
421 return *p_condvar ? 0 : ENOMEM;
427 * Destroys a condition variable. No threads shall be waiting or signaling the
429 * @param p_condvar condition variable to destroy
431 void vlc_cond_destroy (vlc_cond_t *p_condvar)
433 #if defined( LIBVLC_USE_PTHREAD )
434 int val = pthread_cond_destroy( p_condvar );
435 VLC_THREAD_ASSERT ("destroying condition");
437 #elif defined( WIN32 )
438 CloseHandle( *p_condvar );
444 * Wakes up one thread waiting on a condition variable, if any.
445 * @param p_condvar condition variable
447 void vlc_cond_signal (vlc_cond_t *p_condvar)
449 #if defined(LIBVLC_USE_PTHREAD)
450 int val = pthread_cond_signal( p_condvar );
451 VLC_THREAD_ASSERT ("signaling condition variable");
453 #elif defined( WIN32 )
454 /* NOTE: This will cause a broadcast, that is wrong.
455 * This will also wake up the next waiting thread if no thread are yet
456 * waiting, which is also wrong. However both of these issues are allowed
457 * by the provision for spurious wakeups. Better have too many wakeups
458 * than too few (= deadlocks). */
459 SetEvent (*p_condvar);
465 * Wakes up all threads (if any) waiting on a condition variable.
466 * @param p_cond condition variable
468 void vlc_cond_broadcast (vlc_cond_t *p_condvar)
470 #if defined (LIBVLC_USE_PTHREAD)
471 pthread_cond_broadcast (p_condvar);
473 #elif defined (WIN32)
474 SetEvent (*p_condvar);
480 * Waits for a condition variable. The calling thread will be suspended until
481 * another thread calls vlc_cond_signal() or vlc_cond_broadcast() on the same
482 * condition variable, the thread is cancelled with vlc_cancel(), or the
483 * system causes a "spurious" unsolicited wake-up.
485 * A mutex is needed to wait on a condition variable. It must <b>not</b> be
486 * a recursive mutex. Although it is possible to use the same mutex for
487 * multiple condition, it is not valid to use different mutexes for the same
488 * condition variable at the same time from different threads.
490 * In case of thread cancellation, the mutex is always locked before
491 * cancellation proceeds.
493 * The canonical way to use a condition variable to wait for event foobar is:
495 vlc_mutex_lock (&lock);
496 mutex_cleanup_push (&lock); // release the mutex in case of cancellation
499 vlc_cond_wait (&wait, &lock);
501 --- foobar is now true, do something about it here --
503 vlc_cleanup_run (); // release the mutex
506 * @param p_condvar condition variable to wait on
507 * @param p_mutex mutex which is unlocked while waiting,
508 * then locked again when waking up.
509 * @param deadline <b>absolute</b> timeout
511 * @return 0 if the condition was signaled, an error code in case of timeout.
513 void vlc_cond_wait (vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex)
515 #if defined(LIBVLC_USE_PTHREAD)
516 int val = pthread_cond_wait( p_condvar, p_mutex );
517 VLC_THREAD_ASSERT ("waiting on condition");
519 #elif defined( WIN32 )
525 LeaveCriticalSection (&p_mutex->mutex);
526 result = WaitForSingleObjectEx (*p_condvar, INFINITE, TRUE);
527 EnterCriticalSection (&p_mutex->mutex);
529 while (result == WAIT_IO_COMPLETION);
531 ResetEvent (*p_condvar);
537 * Waits for a condition variable up to a certain date.
538 * This works like vlc_cond_wait(), except for the additional timeout.
540 * @param p_condvar condition variable to wait on
541 * @param p_mutex mutex which is unlocked while waiting,
542 * then locked again when waking up.
543 * @param deadline <b>absolute</b> timeout
545 * @return 0 if the condition was signaled, an error code in case of timeout.
547 int vlc_cond_timedwait (vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex,
550 #if defined(LIBVLC_USE_PTHREAD)
551 lldiv_t d = lldiv( deadline, CLOCK_FREQ );
552 struct timespec ts = { d.quot, d.rem * (1000000000 / CLOCK_FREQ) };
554 int val = pthread_cond_timedwait (p_condvar, p_mutex, &ts);
555 if (val != ETIMEDOUT)
556 VLC_THREAD_ASSERT ("timed-waiting on condition");
559 #elif defined( WIN32 )
566 mtime_t total = (deadline - mdate ())/1000;
570 DWORD delay = (total > 0x7fffffff) ? 0x7fffffff : total;
571 LeaveCriticalSection (&p_mutex->mutex);
572 result = WaitForSingleObjectEx (*p_condvar, delay, TRUE);
573 EnterCriticalSection (&p_mutex->mutex);
575 while (result == WAIT_IO_COMPLETION);
577 ResetEvent (*p_condvar);
579 return (result == WAIT_OBJECT_0) ? 0 : ETIMEDOUT;
584 /*****************************************************************************
585 * vlc_tls_create: create a thread-local variable
586 *****************************************************************************/
587 int vlc_threadvar_create( vlc_threadvar_t *p_tls, void (*destr) (void *) )
591 #if defined( LIBVLC_USE_PTHREAD )
592 i_ret = pthread_key_create( p_tls, destr );
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( WIN32 )
610 # error Unimplemented!
614 #if defined (LIBVLC_USE_PTHREAD)
615 #elif defined (WIN32)
616 static unsigned __stdcall vlc_entry (void *data)
618 vlc_cancel_t cancel_data = VLC_CANCEL_INIT;
619 vlc_thread_t self = data;
621 cancel_data.cancel_event = self->cancel_event;
624 vlc_threadvar_set (&cancel_key, &cancel_data);
625 self->data = self->entry (self->data);
631 * Creates and starts new thread.
633 * @param p_handle [OUT] pointer to write the handle of the created thread to
634 * @param entry entry point for the thread
635 * @param data data parameter given to the entry point
636 * @param priority thread priority value
637 * @return 0 on success, a standard error code on error.
639 int vlc_clone (vlc_thread_t *p_handle, void * (*entry) (void *), void *data,
644 #if defined( LIBVLC_USE_PTHREAD )
646 pthread_attr_init (&attr);
648 /* Block the signals that signals interface plugin handles.
649 * If the LibVLC caller wants to handle some signals by itself, it should
650 * block these before whenever invoking LibVLC. And it must obviously not
651 * start the VLC signals interface plugin.
653 * LibVLC will normally ignore any interruption caused by an asynchronous
654 * signal during a system call. But there may well be some buggy cases
655 * where it fails to handle EINTR (bug reports welcome). Some underlying
656 * libraries might also not handle EINTR properly.
662 sigdelset (&set, SIGHUP);
663 sigaddset (&set, SIGINT);
664 sigaddset (&set, SIGQUIT);
665 sigaddset (&set, SIGTERM);
667 sigaddset (&set, SIGPIPE); /* We don't want this one, really! */
668 pthread_sigmask (SIG_BLOCK, &set, &oldset);
671 struct sched_param sp = { .sched_priority = priority, };
674 if (sp.sched_priority <= 0)
675 sp.sched_priority += sched_get_priority_max (policy = SCHED_OTHER);
677 sp.sched_priority += sched_get_priority_min (policy = SCHED_RR);
679 pthread_attr_setschedpolicy (&attr, policy);
680 pthread_attr_setschedparam (&attr, &sp);
683 /* The thread stack size.
684 * The lower the value, the less address space per thread, the highest
685 * maximum simultaneous threads per process. Too low values will cause
686 * stack overflows and weird crashes. Set with caution. Also keep in mind
687 * that 64-bits platforms consume more stack than 32-bits one.
689 * Thanks to on-demand paging, thread stack size only affects address space
690 * consumption. In terms of memory, threads only use what they need
691 * (rounded up to the page boundary).
693 * For example, on Linux i386, the default is 2 mega-bytes, which supports
694 * about 320 threads per processes. */
695 #define VLC_STACKSIZE (128 * sizeof (void *) * 1024)
698 ret = pthread_attr_setstacksize (&attr, VLC_STACKSIZE);
699 assert (ret == 0); /* fails iif VLC_STACKSIZE is invalid */
702 ret = pthread_create (p_handle, &attr, entry, data);
703 pthread_sigmask (SIG_SETMASK, &oldset, NULL);
704 pthread_attr_destroy (&attr);
706 #elif defined( WIN32 ) || defined( UNDER_CE )
707 /* When using the MSVCRT C library you have to use the _beginthreadex
708 * function instead of CreateThread, otherwise you'll end up with
709 * memory leaks and the signal functions not working (see Microsoft
710 * Knowledge Base, article 104641) */
712 vlc_thread_t th = malloc (sizeof (*th));
719 #if defined( UNDER_CE )
720 th->cancel_event = CreateEvent (NULL, FALSE, FALSE, NULL);
721 if (th->cancel_event == NULL)
726 hThread = CreateThread (NULL, 0, vlc_entry, th, CREATE_SUSPENDED, NULL);
728 hThread = (HANDLE)(uintptr_t)
729 _beginthreadex (NULL, 0, vlc_entry, th, CREATE_SUSPENDED, NULL);
735 /* Thread closes the handle when exiting, duplicate it here
736 * to be on the safe side when joining. */
737 if (!DuplicateHandle (GetCurrentProcess (), hThread,
738 GetCurrentProcess (), &th->handle, 0, FALSE,
739 DUPLICATE_SAME_ACCESS))
741 CloseHandle (hThread);
746 th->handle = hThread;
749 ResumeThread (hThread);
751 SetThreadPriority (hThread, priority);
767 /* APC procedure for thread cancellation */
768 static void CALLBACK vlc_cancel_self (ULONG_PTR dummy)
771 vlc_control_cancel (VLC_DO_CANCEL);
776 * Marks a thread as cancelled. Next time the target thread reaches a
777 * cancellation point (while not having disabled cancellation), it will
778 * run its cancellation cleanup handler, the thread variable destructors, and
779 * terminate. vlc_join() must be used afterward regardless of a thread being
782 void vlc_cancel (vlc_thread_t thread_id)
784 #if defined (LIBVLC_USE_PTHREAD_CANCEL)
785 pthread_cancel (thread_id);
786 #elif defined (UNDER_CE)
787 SetEvent (thread_id->cancel_event);
788 #elif defined (WIN32)
789 QueueUserAPC (vlc_cancel_self, thread_id->handle, 0);
791 # warning vlc_cancel is not implemented!
796 * Waits for a thread to complete (if needed), and destroys it.
797 * This is a cancellation point; in case of cancellation, the join does _not_
800 * @param handle thread handle
801 * @param p_result [OUT] pointer to write the thread return value or NULL
802 * @return 0 on success, a standard error code otherwise.
804 void vlc_join (vlc_thread_t handle, void **result)
806 #if defined( LIBVLC_USE_PTHREAD )
807 int val = pthread_join (handle, result);
809 vlc_thread_fatal ("joining thread", val, __func__, __FILE__, __LINE__);
811 #elif defined( UNDER_CE ) || defined( WIN32 )
814 while (WaitForSingleObjectEx (handle->handle, INFINITE, TRUE)
815 == WAIT_IO_COMPLETION);
817 CloseHandle (handle->handle);
819 *result = handle->data;
820 #if defined( UNDER_CE )
821 CloseHandle (handle->cancel_event);
829 struct vlc_thread_boot
831 void * (*entry) (vlc_object_t *);
832 vlc_object_t *object;
835 static void *thread_entry (void *data)
837 vlc_object_t *obj = ((struct vlc_thread_boot *)data)->object;
838 void *(*func) (vlc_object_t *) = ((struct vlc_thread_boot *)data)->entry;
841 msg_Dbg (obj, "thread started");
843 msg_Dbg (obj, "thread ended");
848 /*****************************************************************************
849 * vlc_thread_create: create a thread, inner version
850 *****************************************************************************
851 * Note that i_priority is only taken into account on platforms supporting
852 * userland real-time priority threads.
853 *****************************************************************************/
854 int __vlc_thread_create( vlc_object_t *p_this, const char * psz_file, int i_line,
855 const char *psz_name, void * ( *func ) ( vlc_object_t * ),
856 int i_priority, bool b_wait )
859 vlc_object_internals_t *p_priv = vlc_internals( p_this );
861 struct vlc_thread_boot *boot = malloc (sizeof (*boot));
865 boot->object = p_this;
867 /* Make sure we don't re-create a thread if the object has already one */
868 assert( !p_priv->b_thread );
870 #if defined( LIBVLC_USE_PTHREAD )
872 if( config_GetInt( p_this, "rt-priority" ) > 0 )
875 /* Hack to avoid error msg */
876 if( config_GetType( p_this, "rt-offset" ) )
877 i_priority += config_GetInt( p_this, "rt-offset" );
881 p_priv->b_thread = true;
882 i_ret = vlc_clone( &p_priv->thread_id, thread_entry, boot, i_priority );
885 msg_Dbg( p_this, "thread (%s) created at priority %d (%s:%d)",
886 psz_name, i_priority, psz_file, i_line );
891 p_priv->b_thread = false;
893 msg_Err( p_this, "%s thread could not be created at %s:%d (%m)",
894 psz_name, psz_file, i_line );
900 /*****************************************************************************
901 * vlc_thread_set_priority: set the priority of the current thread when we
902 * couldn't set it in vlc_thread_create (for instance for the main thread)
903 *****************************************************************************/
904 int __vlc_thread_set_priority( vlc_object_t *p_this, const char * psz_file,
905 int i_line, int i_priority )
907 vlc_object_internals_t *p_priv = vlc_internals( p_this );
909 if( !p_priv->b_thread )
911 msg_Err( p_this, "couldn't set priority of non-existent thread" );
915 #if defined( LIBVLC_USE_PTHREAD )
917 if( config_GetInt( p_this, "rt-priority" ) > 0 )
920 int i_error, i_policy;
921 struct sched_param param;
923 memset( ¶m, 0, sizeof(struct sched_param) );
924 if( config_GetType( p_this, "rt-offset" ) )
925 i_priority += config_GetInt( p_this, "rt-offset" );
926 if( i_priority <= 0 )
928 param.sched_priority = (-1) * i_priority;
929 i_policy = SCHED_OTHER;
933 param.sched_priority = i_priority;
936 if( (i_error = pthread_setschedparam( p_priv->thread_id,
937 i_policy, ¶m )) )
940 msg_Warn( p_this, "couldn't set thread priority (%s:%d): %m",
946 #elif defined( WIN32 ) || defined( UNDER_CE )
947 VLC_UNUSED( psz_file); VLC_UNUSED( i_line );
949 if( !SetThreadPriority(p_priv->thread_id->handle, i_priority) )
951 msg_Warn( p_this, "couldn't set a faster priority" );
960 /*****************************************************************************
961 * vlc_thread_join: wait until a thread exits, inner version
962 *****************************************************************************/
963 void __vlc_thread_join( vlc_object_t *p_this )
965 vlc_object_internals_t *p_priv = vlc_internals( p_this );
967 #if defined( LIBVLC_USE_PTHREAD )
968 vlc_join (p_priv->thread_id, NULL);
970 #elif defined( UNDER_CE ) || defined( WIN32 )
972 FILETIME create_ft, exit_ft, kernel_ft, user_ft;
973 int64_t real_time, kernel_time, user_time;
976 if( ! DuplicateHandle(GetCurrentProcess(),
977 p_priv->thread_id->handle,
982 DUPLICATE_SAME_ACCESS) )
984 p_priv->b_thread = false;
985 return; /* We have a problem! */
988 hThread = p_priv->thread_id->handle;
991 vlc_join( p_priv->thread_id, NULL );
993 if( GetThreadTimes( hThread, &create_ft, &exit_ft, &kernel_ft, &user_ft ) )
996 ((((int64_t)exit_ft.dwHighDateTime)<<32)| exit_ft.dwLowDateTime) -
997 ((((int64_t)create_ft.dwHighDateTime)<<32)| create_ft.dwLowDateTime);
1001 ((((int64_t)kernel_ft.dwHighDateTime)<<32)|
1002 kernel_ft.dwLowDateTime) / 10;
1005 ((((int64_t)user_ft.dwHighDateTime)<<32)|
1006 user_ft.dwLowDateTime) / 10;
1008 msg_Dbg( p_this, "thread times: "
1009 "real %"PRId64"m%fs, kernel %"PRId64"m%fs, user %"PRId64"m%fs",
1010 real_time/60/1000000,
1011 (double)((real_time%(60*1000000))/1000000.0),
1012 kernel_time/60/1000000,
1013 (double)((kernel_time%(60*1000000))/1000000.0),
1014 user_time/60/1000000,
1015 (double)((user_time%(60*1000000))/1000000.0) );
1017 CloseHandle( hThread );
1020 vlc_join( p_priv->thread_id, NULL );
1024 p_priv->b_thread = false;
1027 void vlc_thread_cancel (vlc_object_t *obj)
1029 vlc_object_internals_t *priv = vlc_internals (obj);
1032 vlc_cancel (priv->thread_id);
1035 void vlc_control_cancel (int cmd, ...)
1037 /* NOTE: This function only modifies thread-specific data, so there is no
1038 * need to lock anything. */
1039 #ifdef LIBVLC_USE_PTHREAD_CANCEL
1045 vlc_cancel_t *nfo = vlc_threadvar_get (&cancel_key);
1049 /* Main thread - cannot be cancelled anyway */
1052 nfo = malloc (sizeof (*nfo));
1054 return; /* Uho! Expect problems! */
1055 *nfo = VLC_CANCEL_INIT;
1056 vlc_threadvar_set (&cancel_key, nfo);
1063 case VLC_SAVE_CANCEL:
1065 int *p_state = va_arg (ap, int *);
1066 *p_state = nfo->killable;
1067 nfo->killable = false;
1071 case VLC_RESTORE_CANCEL:
1073 int state = va_arg (ap, int);
1074 nfo->killable = state != 0;
1078 case VLC_TEST_CANCEL:
1079 if (nfo->killable && nfo->killed)
1081 for (vlc_cleanup_t *p = nfo->cleaners; p != NULL; p = p->next)
1086 #if defined (LIBVLC_USE_PTHREAD)
1087 pthread_exit (PTHREAD_CANCELLED);
1088 #elif defined (UNDER_CE)
1090 #elif defined (WIN32)
1093 # error Not implemented!
1102 case VLC_CLEANUP_PUSH:
1104 /* cleaner is a pointer to the caller stack, no need to allocate
1105 * and copy anything. As a nice side effect, this cannot fail. */
1106 vlc_cleanup_t *cleaner = va_arg (ap, vlc_cleanup_t *);
1107 cleaner->next = nfo->cleaners;
1108 nfo->cleaners = cleaner;
1112 case VLC_CLEANUP_POP:
1114 nfo->cleaners = nfo->cleaners->next;