1 /*****************************************************************************
2 * objects.c: vlc_object_t handling
3 *****************************************************************************
4 * Copyright (C) 2004-2008 the VideoLAN team
7 * Authors: Samuel Hocevar <sam@zoy.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
26 * This file contains the functions to handle the vlc_object_t type
30 /*****************************************************************************
32 *****************************************************************************/
39 #include "../libvlc.h"
42 #include "audio_output/aout_internal.h"
44 #include <vlc_access.h>
45 #include <vlc_demux.h>
46 #include <vlc_stream.h>
49 #include "stream_output/stream_output.h"
51 #include "vlc_interface.h"
52 #include "vlc_codec.h"
53 #include "vlc_filter.h"
55 #include "variables.h"
61 # include <errno.h> /* ENOSYS */
65 /*****************************************************************************
67 *****************************************************************************/
68 static int DumpCommand( vlc_object_t *, char const *,
69 vlc_value_t, vlc_value_t, void * );
71 static vlc_object_t * FindObject ( vlc_object_t *, int, int );
72 static vlc_object_t * FindObjectName( vlc_object_t *, const char *, int );
73 static void PrintObject ( vlc_object_t *, const char * );
74 static void DumpStructure ( vlc_object_t *, int, char * );
76 static vlc_list_t * NewList ( int );
77 static void ListReplace ( vlc_list_t *, vlc_object_t *, int );
78 /*static void ListAppend ( vlc_list_t *, vlc_object_t * );*/
79 static int CountChildren ( vlc_object_t *, int );
80 static void ListChildren ( vlc_list_t *, vlc_object_t *, int );
82 static void vlc_object_destroy( vlc_object_t *p_this );
83 static void vlc_object_detach_unlocked (vlc_object_t *p_this);
85 /*****************************************************************************
86 * Local structure lock
87 *****************************************************************************/
88 static vlc_mutex_t structure_lock;
89 static vlc_threadvar_t thread_object;
91 void *vlc_custom_create( vlc_object_t *p_this, size_t i_size,
92 int i_type, const char *psz_type )
95 vlc_object_internals_t *p_priv;
98 * VLC objects are laid out as follow:
99 * - first the LibVLC-private per-object data,
100 * - then VLC_COMMON members from vlc_object_t,
101 * - finally, the type-specific data (if any).
103 * This function initializes the LibVLC and common data,
104 * and zeroes the rest.
106 p_priv = calloc( 1, sizeof( *p_priv ) + i_size );
110 assert (i_size >= sizeof (vlc_object_t));
111 p_new = (vlc_object_t *)(p_priv + 1);
113 p_new->i_object_type = i_type;
114 p_new->psz_object_type = psz_type;
115 p_new->psz_object_name = NULL;
117 p_new->b_die = false;
118 p_new->b_error = false;
119 p_new->b_dead = false;
120 p_new->b_force = false;
122 p_new->psz_header = NULL;
125 p_new->i_flags = p_this->i_flags
126 & (OBJECT_FLAGS_NODBG|OBJECT_FLAGS_QUIET|OBJECT_FLAGS_NOINTERACT);
128 p_priv->p_vars = calloc( sizeof( variable_t ), 16 );
130 if( !p_priv->p_vars )
136 libvlc_global_data_t *p_libvlc_global;
139 /* Only the global root object is created out of the blue */
140 p_libvlc_global = (libvlc_global_data_t *)p_new;
141 p_new->p_libvlc = NULL;
143 p_libvlc_global->i_counter = 0;
144 p_priv->next = p_priv->prev = p_new;
145 vlc_mutex_init( &structure_lock );
149 p_libvlc_global = vlc_global();
150 if( i_type == VLC_OBJECT_LIBVLC )
151 p_new->p_libvlc = (libvlc_int_t*)p_new;
153 p_new->p_libvlc = p_this->p_libvlc;
156 vlc_spin_init( &p_priv->ref_spin );
157 p_priv->i_refcount = 1;
158 p_priv->pf_destructor = NULL;
159 p_priv->b_thread = false;
160 p_new->p_parent = NULL;
161 p_priv->pp_children = NULL;
162 p_priv->i_children = 0;
164 p_new->p_private = NULL;
166 /* Initialize mutexes and condvars */
167 vlc_mutex_init( &p_new->object_lock );
168 vlc_cond_init( p_new, &p_new->object_wait );
169 vlc_mutex_init( &p_priv->var_lock );
170 vlc_spin_init( &p_priv->spin );
171 p_priv->pipes[0] = p_priv->pipes[1] = -1;
173 p_priv->next = VLC_OBJECT (p_libvlc_global);
174 vlc_mutex_lock( &structure_lock );
175 p_priv->prev = vlc_internals (p_libvlc_global)->prev;
176 vlc_internals (p_libvlc_global)->prev = p_new;
177 vlc_internals (p_priv->prev)->next = p_new;
178 p_new->i_object_id = p_libvlc_global->i_counter++;
179 vlc_mutex_unlock( &structure_lock );
181 if( i_type == VLC_OBJECT_LIBVLC )
183 var_Create( p_new, "list", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
184 var_AddCallback( p_new, "list", DumpCommand, NULL );
185 var_Create( p_new, "tree", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
186 var_AddCallback( p_new, "tree", DumpCommand, NULL );
187 var_Create( p_new, "vars", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
188 var_AddCallback( p_new, "vars", DumpCommand, NULL );
196 * Allocates and initializes a vlc object.
198 * @param i_type known object type (all of them are negative integer values),
199 * or object byte size (always positive).
201 * @return the new object, or NULL on error.
203 void * __vlc_object_create( vlc_object_t *p_this, int i_type )
205 const char * psz_type;
210 case VLC_OBJECT_LIBVLC:
211 i_size = sizeof(libvlc_int_t);
214 case VLC_OBJECT_INTF:
215 i_size = sizeof(intf_thread_t);
216 psz_type = "interface";
218 case VLC_OBJECT_DIALOGS:
219 i_size = sizeof(intf_thread_t);
220 psz_type = "dialogs";
222 case VLC_OBJECT_DEMUX:
223 i_size = sizeof(demux_t);
226 case VLC_OBJECT_ACCESS:
227 i_size = sizeof(access_t);
230 case VLC_OBJECT_DECODER:
231 i_size = sizeof(decoder_t);
232 psz_type = "decoder";
234 case VLC_OBJECT_PACKETIZER:
235 i_size = sizeof(decoder_t);
236 psz_type = "packetizer";
238 case VLC_OBJECT_ENCODER:
239 i_size = sizeof(encoder_t);
240 psz_type = "encoder";
242 case VLC_OBJECT_FILTER:
243 i_size = sizeof(filter_t);
246 case VLC_OBJECT_VOUT:
247 i_size = sizeof(vout_thread_t);
248 psz_type = "video output";
250 case VLC_OBJECT_AOUT:
251 i_size = sizeof(aout_instance_t);
252 psz_type = "audio output";
254 case VLC_OBJECT_SOUT:
255 i_size = sizeof(sout_instance_t);
256 psz_type = "stream output";
258 case VLC_OBJECT_OPENGL:
259 i_size = sizeof( vout_thread_t );
262 case VLC_OBJECT_ANNOUNCE:
263 i_size = sizeof( announce_handler_t );
264 psz_type = "announce";
266 case VLC_OBJECT_INTERACTION:
267 i_size = sizeof( interaction_t );
268 psz_type = "interaction";
271 i_size = i_type > (int)sizeof(vlc_object_t)
272 ? i_type : (int)sizeof(vlc_object_t);
273 i_type = VLC_OBJECT_GENERIC;
274 psz_type = "generic";
278 return vlc_custom_create( p_this, i_size, i_type, psz_type );
283 ****************************************************************************
284 * Set the destructor of a vlc object
286 * This function sets the destructor of the vlc object. It will be called
287 * when the object is destroyed when the its refcount reaches 0.
288 * (It is called by the internal function vlc_object_destroy())
289 *****************************************************************************/
290 void __vlc_object_set_destructor( vlc_object_t *p_this,
291 vlc_destructor_t pf_destructor )
293 vlc_object_internals_t *p_priv = vlc_internals(p_this );
294 p_priv->pf_destructor = pf_destructor;
298 ****************************************************************************
299 * Destroy a vlc object (Internal)
301 * This function destroys an object that has been previously allocated with
302 * vlc_object_create. The object's refcount must be zero and it must not be
303 * attached to other objects in any way.
304 *****************************************************************************/
305 static void vlc_object_destroy( vlc_object_t *p_this )
307 vlc_object_internals_t *p_priv = vlc_internals( p_this );
309 /* Objects are always detached beforehand */
310 assert( !p_this->p_parent );
312 /* Send a kill to the object's thread if applicable */
313 vlc_object_kill( p_this );
315 /* If we are running on a thread, wait until it ends */
316 if( p_priv->b_thread )
317 vlc_thread_join( p_this );
319 /* Call the custom "subclass" destructor */
320 if( p_priv->pf_destructor )
321 p_priv->pf_destructor( p_this );
323 /* Destroy the associated variables, starting from the end so that
324 * no memmove calls have to be done. */
325 while( p_priv->i_vars )
327 var_Destroy( p_this, p_priv->p_vars[p_priv->i_vars - 1].psz_name );
330 free( p_priv->p_vars );
331 vlc_mutex_destroy( &p_priv->var_lock );
333 free( p_this->psz_header );
335 if( p_this->p_libvlc == NULL )
337 libvlc_global_data_t *p_global = (libvlc_global_data_t *)p_this;
340 assert( p_global == vlc_global() );
342 if (p_priv->next != p_this)
344 vlc_object_t *leaked = p_priv->next, *first = leaked;
347 /* We are leaking this object */
349 "ERROR: leaking object (id:%i, type:%s, name:%s)\n",
350 leaked->i_object_id, leaked->psz_object_type,
351 leaked->psz_object_name );
352 /* Dump libvlc object to ease debugging */
353 vlc_object_dump( leaked );
355 leaked = vlc_internals (leaked)->next;
357 while (leaked != first);
359 /* Dump global object to ease debugging */
360 vlc_object_dump( p_this );
361 /* Strongly abort, cause we want these to be fixed */
366 /* We are the global object ... no need to lock. */
367 vlc_mutex_destroy( &structure_lock );
370 FREENULL( p_this->psz_object_name );
372 #if defined(WIN32) || defined(UNDER_CE)
373 /* if object has an associated thread, close it now */
374 if( p_priv->thread_id )
375 CloseHandle(p_priv->thread_id);
378 vlc_spin_destroy( &p_priv->ref_spin );
379 vlc_mutex_destroy( &p_this->object_lock );
380 vlc_cond_destroy( &p_this->object_wait );
381 vlc_spin_destroy( &p_priv->spin );
382 if( p_priv->pipes[1] != -1 )
383 close( p_priv->pipes[1] );
384 if( p_priv->pipes[0] != -1 )
385 close( p_priv->pipes[0] );
391 /** Inter-object signaling */
393 void __vlc_object_lock( vlc_object_t *obj )
395 vlc_mutex_lock( &obj->object_lock );
398 void __vlc_object_unlock( vlc_object_t *obj )
400 vlc_assert_locked( &obj->object_lock );
401 vlc_mutex_unlock( &obj->object_lock );
405 # include <winsock2.h>
406 # include <ws2tcpip.h>
409 * select()-able pipes emulated using Winsock
411 static int pipe (int fd[2])
414 int addrlen = sizeof (addr);
416 SOCKET l = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP), a,
417 c = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
418 if ((l == INVALID_SOCKET) || (c == INVALID_SOCKET))
421 memset (&addr, 0, sizeof (addr));
422 addr.sin_family = AF_INET;
423 addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
424 if (bind (l, (PSOCKADDR)&addr, sizeof (addr))
425 || getsockname (l, (PSOCKADDR)&addr, &addrlen)
427 || connect (c, (PSOCKADDR)&addr, addrlen))
430 a = accept (l, NULL, NULL);
431 if (a == INVALID_SOCKET)
442 if (l != INVALID_SOCKET)
444 if (c != INVALID_SOCKET)
450 #define read( a, b, c ) recv (a, b, c, 0)
452 #define write( a, b, c ) send (a, b, c, 0)
454 #define close( a ) closesocket (a)
458 * Returns the readable end of a pipe that becomes readable once termination
459 * of the object is requested (vlc_object_kill()).
460 * This can be used to wake-up out of a select() or poll() event loop, such
461 * typically when doing network I/O.
463 * Note that the pipe will remain the same for the lifetime of the object.
464 * DO NOT read the pipe nor close it yourself. Ever.
466 * @param obj object that would be "killed"
467 * @return a readable pipe descriptor, or -1 on error.
469 int __vlc_object_waitpipe( vlc_object_t *obj )
471 int pfd[2] = { -1, -1 };
472 vlc_object_internals_t *internals = vlc_internals( obj );
475 vlc_spin_lock (&internals->spin);
476 if (internals->pipes[0] == -1)
478 /* This can only ever happen if someone killed us without locking: */
479 assert (internals->pipes[1] == -1);
480 vlc_spin_unlock (&internals->spin);
485 vlc_spin_lock (&internals->spin);
486 if (internals->pipes[0] == -1)
488 internals->pipes[0] = pfd[0];
489 internals->pipes[1] = pfd[1];
490 pfd[0] = pfd[1] = -1;
494 vlc_spin_unlock (&internals->spin);
498 /* Race condition: vlc_object_kill() already invoked! */
501 vlc_spin_lock (&internals->spin);
502 fd = internals->pipes[1];
503 internals->pipes[1] = -1;
504 vlc_spin_unlock (&internals->spin);
506 msg_Dbg (obj, "waitpipe: object already dying");
511 /* Race condition: two threads call pipe() - unlikely */
517 return internals->pipes[0];
522 * Waits for the object to be signaled (using vlc_object_signal()).
523 * If the object already has a signal pending, this function will return
524 * immediately. It is asserted that the caller holds the object lock.
526 * @return true if the object is dying and should terminate.
528 bool __vlc_object_wait( vlc_object_t *obj )
530 vlc_assert_locked( &obj->object_lock );
531 vlc_cond_wait( &obj->object_wait, &obj->object_lock );
537 * Waits for the object to be signaled (using vlc_object_signal()), or for
539 * If the object already has a signal pending, this function will return
540 * immediately. It is asserted that the caller holds the object lock.
542 * @return negative if the object is dying and should terminate,
543 * positive if the the object has been signaled but is not dying,
544 * 0 if timeout has been reached.
546 int __vlc_object_timedwait( vlc_object_t *obj, mtime_t deadline )
550 vlc_assert_locked( &obj->object_lock );
551 v = vlc_cond_timedwait( &obj->object_wait, &obj->object_lock, deadline );
552 if( v == 0 ) /* signaled */
553 return obj->b_die ? -1 : 1;
559 * Checks whether an object has been "killed".
560 * The object lock must be held.
562 * Typical code for an object thread could be:
564 vlc_object_lock (self);
566 while (vlc_object_alive (self))
570 if (vlc_object_wait (self))
575 ...deinitialization...
576 vlc_object_unlock (self);
579 * @return true iff the object has not been killed yet
581 bool __vlc_object_alive( vlc_object_t *obj )
583 vlc_assert_locked( &obj->object_lock );
589 * Signals an object for which the lock is held.
591 void __vlc_object_signal_unlocked( vlc_object_t *obj )
593 vlc_assert_locked (&obj->object_lock);
594 vlc_cond_signal( &obj->object_wait );
599 * Requests termination of an object.
600 * If the object is LibVLC, also request to terminate all its children.
602 void __vlc_object_kill( vlc_object_t *p_this )
604 vlc_object_internals_t *internals = vlc_internals( p_this );
607 vlc_mutex_lock( &p_this->object_lock );
608 p_this->b_die = true;
610 vlc_spin_lock (&internals->spin);
611 fd = internals->pipes[1];
612 internals->pipes[1] = -1;
613 vlc_spin_unlock (&internals->spin);
617 msg_Dbg (p_this, "waitpipe: object killed");
621 if( p_this->i_object_type == VLC_OBJECT_LIBVLC )
622 for( int i = 0; i < internals->i_children ; i++ )
623 vlc_object_kill( internals->pp_children[i] );
625 vlc_object_signal_unlocked( p_this );
626 vlc_mutex_unlock( &p_this->object_lock );
631 * Find an object given its ID.
633 * This function looks for the object whose i_object_id field is i_id.
634 * This function is slow, and often used to hide bugs. Do not use it.
635 * If you need to retain reference to an object, yield the object pointer with
636 * vlc_object_yield(), use the pointer as your reference, and call
637 * vlc_object_release() when you're done.
639 void * vlc_object_get( int i_id )
641 libvlc_global_data_t *p_libvlc_global = vlc_global();
642 vlc_object_t *obj = NULL;
644 vlc_mutex_lock( &structure_lock );
646 for( obj = vlc_internals (p_libvlc_global)->next;
647 obj != VLC_OBJECT (p_libvlc_global);
648 obj = vlc_internals (obj)->next )
650 if( obj->i_object_id == i_id )
652 vlc_object_yield( obj );
659 vlc_mutex_unlock( &structure_lock );
664 ****************************************************************************
665 * find a typed object and increment its refcount
666 *****************************************************************************
667 * This function recursively looks for a given object type. i_mode can be one
668 * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
669 *****************************************************************************/
670 void * __vlc_object_find( vlc_object_t *p_this, int i_type, int i_mode )
672 vlc_object_t *p_found;
674 /* If we are of the requested type ourselves, don't look further */
675 if( !(i_mode & FIND_STRICT) && p_this->i_object_type == i_type )
677 vlc_object_yield( p_this );
681 /* Otherwise, recursively look for the object */
682 if ((i_mode & 0x000f) == FIND_ANYWHERE)
685 if (i_type == VLC_OBJECT_PLAYLIST)
686 msg_Warn (p_this, "using vlc_object_find(VLC_OBJECT_PLAYLIST) "
687 "instead of pl_Yield()");
689 return vlc_object_find (p_this->p_libvlc, i_type,
690 (i_mode & ~0x000f)|FIND_CHILD);
693 vlc_mutex_lock( &structure_lock );
694 p_found = FindObject( p_this, i_type, i_mode );
695 vlc_mutex_unlock( &structure_lock );
700 ****************************************************************************
701 * find a named object and increment its refcount
702 *****************************************************************************
703 * This function recursively looks for a given object name. i_mode can be one
704 * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
705 *****************************************************************************/
706 void * __vlc_object_find_name( vlc_object_t *p_this, const char *psz_name,
709 vlc_object_t *p_found;
711 /* If have the requested name ourselves, don't look further */
712 if( !(i_mode & FIND_STRICT)
713 && p_this->psz_object_name
714 && !strcmp( p_this->psz_object_name, psz_name ) )
716 vlc_object_yield( p_this );
720 vlc_mutex_lock( &structure_lock );
722 /* Otherwise, recursively look for the object */
723 if( (i_mode & 0x000f) == FIND_ANYWHERE )
725 vlc_object_t *p_root = p_this;
728 while( p_root->p_parent != NULL &&
729 p_root != VLC_OBJECT( p_this->p_libvlc ) )
731 p_root = p_root->p_parent;
734 p_found = FindObjectName( p_root, psz_name,
735 (i_mode & ~0x000f)|FIND_CHILD );
736 if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
738 p_found = FindObjectName( VLC_OBJECT( p_this->p_libvlc ),
739 psz_name, (i_mode & ~0x000f)|FIND_CHILD );
744 p_found = FindObjectName( p_this, psz_name, i_mode );
747 vlc_mutex_unlock( &structure_lock );
753 * Increment an object reference counter.
755 void __vlc_object_yield( vlc_object_t *p_this )
757 vlc_object_internals_t *internals = vlc_internals( p_this );
759 vlc_spin_lock( &internals->ref_spin );
760 /* Avoid obvious freed object uses */
761 assert( internals->i_refcount > 0 );
762 /* Increment the counter */
763 internals->i_refcount++;
764 vlc_spin_unlock( &internals->ref_spin );
767 /*****************************************************************************
768 * decrement an object refcount
769 * And destroy the object if its refcount reach zero.
770 *****************************************************************************/
771 void __vlc_object_release( vlc_object_t *p_this )
773 vlc_object_internals_t *internals = vlc_internals( p_this );
774 bool b_should_destroy;
776 vlc_spin_lock( &internals->ref_spin );
777 assert( internals->i_refcount > 0 );
779 if( internals->i_refcount > 1 )
782 /* There are still other references to the object */
783 internals->i_refcount--;
784 vlc_spin_unlock( &internals->ref_spin );
787 vlc_spin_unlock( &internals->ref_spin );
790 /* Remember that we cannot hold the spin while waiting on the mutex */
791 vlc_mutex_lock( &structure_lock );
792 /* Take the spin again. Note that another thread may have yielded the
793 * object in the (very short) mean time. */
794 vlc_spin_lock( &internals->ref_spin );
795 b_should_destroy = --internals->i_refcount == 0;
796 vlc_spin_unlock( &internals->ref_spin );
798 if( b_should_destroy )
800 /* Remove the object from object list
801 * so that it cannot be encountered by vlc_object_get() */
802 vlc_internals (internals->next)->prev = internals->prev;
803 vlc_internals (internals->prev)->next = internals->next;
805 /* Detach from parent to protect against FIND_CHILDREN */
806 vlc_object_detach_unlocked (p_this);
807 /* Detach from children to protect against FIND_PARENT */
808 for (int i = 0; i < internals->i_children; i++)
809 internals->pp_children[i]->p_parent = NULL;
812 vlc_mutex_unlock( &structure_lock );
814 if( b_should_destroy )
816 free( internals->pp_children );
817 internals->pp_children = NULL;
818 internals->i_children = 0;
819 vlc_object_destroy( p_this );
824 ****************************************************************************
825 * attach object to a parent object
826 *****************************************************************************
827 * This function sets p_this as a child of p_parent, and p_parent as a parent
828 * of p_this. This link can be undone using vlc_object_detach.
829 *****************************************************************************/
830 void __vlc_object_attach( vlc_object_t *p_this, vlc_object_t *p_parent )
832 if( !p_this ) return;
834 vlc_mutex_lock( &structure_lock );
836 /* Attach the parent to its child */
837 assert (!p_this->p_parent);
838 p_this->p_parent = p_parent;
840 vlc_object_lock( p_this->p_parent );
842 /* Attach the child to its parent */
843 vlc_object_internals_t *priv = vlc_internals( p_parent );
844 INSERT_ELEM( priv->pp_children, priv->i_children, priv->i_children,
847 /* Kill the object if parent is already dead */
848 if( !vlc_object_alive( p_this->p_parent) )
849 vlc_object_kill( p_this );
851 vlc_object_unlock( p_this->p_parent );
853 vlc_mutex_unlock( &structure_lock );
857 static void vlc_object_detach_unlocked (vlc_object_t *p_this)
859 vlc_assert_locked (&structure_lock);
861 if (p_this->p_parent == NULL)
864 vlc_object_internals_t *priv = vlc_internals( p_this->p_parent );
868 /* Remove p_this's parent */
869 p_this->p_parent = NULL;
871 /* Remove all of p_parent's children which are p_this */
872 for( i_index = priv->i_children ; i_index-- ; )
874 if( priv->pp_children[i_index] == p_this )
877 for( i = i_index ; i < priv->i_children ; i++ )
878 priv->pp_children[i] = priv->pp_children[i+1];
882 if( priv->i_children )
884 priv->pp_children = (vlc_object_t **)realloc( priv->pp_children,
885 priv->i_children * sizeof(vlc_object_t *) );
889 /* Special case - don't realloc() to zero to avoid leaking */
890 free( priv->pp_children );
891 priv->pp_children = NULL;
897 ****************************************************************************
898 * detach object from its parent
899 *****************************************************************************
900 * This function removes all links between an object and its parent.
901 *****************************************************************************/
902 void __vlc_object_detach( vlc_object_t *p_this )
904 if( !p_this ) return;
906 vlc_mutex_lock( &structure_lock );
907 if( !p_this->p_parent )
908 msg_Err( p_this, "object is not attached" );
910 vlc_object_detach_unlocked( p_this );
911 vlc_mutex_unlock( &structure_lock );
916 ****************************************************************************
917 * find a list typed objects and increment their refcount
918 *****************************************************************************
919 * This function recursively looks for a given object type. i_mode can be one
920 * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
921 *****************************************************************************/
922 vlc_list_t * __vlc_list_find( vlc_object_t *p_this, int i_type, int i_mode )
927 /* Look for the objects */
928 switch( i_mode & 0x000f )
931 /* Modules should probably not be object, and the module should perhaps
932 * not be shared across LibVLC instances. In the mean time, this ugly
933 * hack is brought to you by Courmisch. */
934 if (i_type == VLC_OBJECT_MODULE)
935 return vlc_list_find ((vlc_object_t *)vlc_global ()->p_module_bank,
937 return vlc_list_find (p_this->p_libvlc, i_type, FIND_CHILD);
940 vlc_mutex_lock( &structure_lock );
941 i_count = CountChildren( p_this, i_type );
942 p_list = NewList( i_count );
944 /* Check allocation was successful */
945 if( p_list->i_count != i_count )
947 vlc_mutex_unlock( &structure_lock );
948 msg_Err( p_this, "list allocation failed!" );
954 ListChildren( p_list, p_this, i_type );
955 vlc_mutex_unlock( &structure_lock );
959 msg_Err( p_this, "unimplemented!" );
960 p_list = NewList( 0 );
968 * Gets the list of children of an objects, and increment their reference
970 * @return a list (possibly empty) or NULL in case of error.
972 vlc_list_t *__vlc_list_children( vlc_object_t *obj )
975 vlc_object_internals_t *priv = vlc_internals( obj );
977 vlc_mutex_lock( &structure_lock );
978 l = NewList( priv->i_children );
979 for (int i = 0; i < l->i_count; i++)
981 vlc_object_yield( priv->pp_children[i] );
982 l->p_values[i].p_object = priv->pp_children[i];
984 vlc_mutex_unlock( &structure_lock );
988 /*****************************************************************************
989 * DumpCommand: print the current vlc structure
990 *****************************************************************************
991 * This function prints either an ASCII tree showing the connections between
992 * vlc objects, and additional information such as their refcount, thread ID,
993 * etc. (command "tree"), or the same data as a simple list (command "list").
994 *****************************************************************************/
995 static int DumpCommand( vlc_object_t *p_this, char const *psz_cmd,
996 vlc_value_t oldval, vlc_value_t newval, void *p_data )
998 (void)oldval; (void)p_data;
999 if( *psz_cmd == 'l' )
1001 vlc_object_t *root = VLC_OBJECT (vlc_global ()), *cur = root;
1003 vlc_mutex_lock( &structure_lock );
1006 PrintObject (cur, "");
1007 cur = vlc_internals (cur)->next;
1009 while (cur != root);
1010 vlc_mutex_unlock( &structure_lock );
1014 vlc_object_t *p_object = NULL;
1016 if( *newval.psz_string )
1019 int i_id = strtol( newval.psz_string, &end, 0 );
1020 if( end != newval.psz_string )
1021 p_object = vlc_object_get( i_id );
1024 /* try using the object's name to find it */
1025 vlc_object_t *p_libvlc = vlc_object_get( 1 );
1028 /* Look in p_libvlc's children tree */
1029 p_object = vlc_object_find_name( p_libvlc,
1032 vlc_object_release( p_libvlc );
1036 /* If it's not in libvlc, look in libvlc_global (== p_this) */
1037 p_object = vlc_object_find_name( p_this,
1049 vlc_mutex_lock( &structure_lock );
1051 if( *psz_cmd == 't' )
1053 char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
1056 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1059 DumpStructure( p_object, 0, psz_foo );
1061 else if( *psz_cmd == 'v' )
1066 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1068 PrintObject( p_object, "" );
1070 if( !vlc_internals( p_object )->i_vars )
1071 printf( " `-o No variables\n" );
1072 for( i = 0; i < vlc_internals( p_object )->i_vars; i++ )
1074 variable_t *p_var = vlc_internals( p_object )->p_vars + i;
1076 const char *psz_type = "unknown";
1077 switch( p_var->i_type & VLC_VAR_TYPE )
1079 #define MYCASE( type, nice ) \
1080 case VLC_VAR_ ## type: \
1083 MYCASE( VOID, "void" );
1084 MYCASE( BOOL, "bool" );
1085 MYCASE( INTEGER, "integer" );
1086 MYCASE( HOTKEY, "hotkey" );
1087 MYCASE( STRING, "string" );
1088 MYCASE( MODULE, "module" );
1089 MYCASE( FILE, "file" );
1090 MYCASE( DIRECTORY, "directory" );
1091 MYCASE( VARIABLE, "variable" );
1092 MYCASE( FLOAT, "float" );
1093 MYCASE( TIME, "time" );
1094 MYCASE( ADDRESS, "address" );
1095 MYCASE( MUTEX, "mutex" );
1096 MYCASE( LIST, "list" );
1099 printf( " %c-o \"%s\" (%s",
1100 i + 1 == vlc_internals( p_object )->i_vars ? '`' : '|',
1101 p_var->psz_name, psz_type );
1102 if( p_var->psz_text )
1103 printf( ", %s", p_var->psz_text );
1105 if( p_var->i_type & VLC_VAR_ISCOMMAND )
1106 printf( ", command" );
1107 if( p_var->i_entries )
1108 printf( ", %d callbacks", p_var->i_entries );
1109 switch( p_var->i_type & 0x00f0 )
1115 printf( ": %s", p_var->val.b_bool ? "true" : "false" );
1117 case VLC_VAR_INTEGER:
1118 printf( ": %d", p_var->val.i_int );
1120 case VLC_VAR_STRING:
1121 printf( ": \"%s\"", p_var->val.psz_string );
1124 printf( ": %f", p_var->val.f_float );
1127 printf( ": %"PRIi64, (int64_t)p_var->val.i_time );
1129 case VLC_VAR_ADDRESS:
1130 printf( ": %p", p_var->val.p_address );
1140 vlc_mutex_unlock( &structure_lock );
1142 if( *newval.psz_string )
1144 vlc_object_release( p_object );
1151 /*****************************************************************************
1152 * vlc_list_release: free a list previously allocated by vlc_list_find
1153 *****************************************************************************
1154 * This function decreases the refcount of all objects in the list and
1156 *****************************************************************************/
1157 void vlc_list_release( vlc_list_t *p_list )
1161 for( i_index = 0; i_index < p_list->i_count; i_index++ )
1163 vlc_object_release( p_list->p_values[i_index].p_object );
1166 free( p_list->p_values );
1170 /*****************************************************************************
1171 * dump an object. (Debug function)
1172 *****************************************************************************/
1173 void __vlc_object_dump( vlc_object_t *p_this )
1175 vlc_mutex_lock( &structure_lock );
1176 char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
1178 DumpStructure( p_this, 0, psz_foo );
1179 vlc_mutex_unlock( &structure_lock );
1182 /* Following functions are local */
1184 static vlc_object_t * FindObject( vlc_object_t *p_this, int i_type, int i_mode )
1187 vlc_object_t *p_tmp;
1189 switch( i_mode & 0x000f )
1192 p_tmp = p_this->p_parent;
1195 if( p_tmp->i_object_type == i_type )
1197 vlc_object_yield( p_tmp );
1202 return FindObject( p_tmp, i_type, i_mode );
1208 for( i = vlc_internals( p_this )->i_children; i--; )
1210 p_tmp = vlc_internals( p_this )->pp_children[i];
1211 if( p_tmp->i_object_type == i_type )
1213 vlc_object_yield( p_tmp );
1216 else if( vlc_internals( p_tmp )->i_children )
1218 p_tmp = FindObject( p_tmp, i_type, i_mode );
1228 /* Handled in vlc_object_find */
1235 static vlc_object_t * FindObjectName( vlc_object_t *p_this,
1236 const char *psz_name,
1240 vlc_object_t *p_tmp;
1242 switch( i_mode & 0x000f )
1245 p_tmp = p_this->p_parent;
1248 if( p_tmp->psz_object_name
1249 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1251 vlc_object_yield( p_tmp );
1256 return FindObjectName( p_tmp, psz_name, i_mode );
1262 for( i = vlc_internals( p_this )->i_children; i--; )
1264 p_tmp = vlc_internals( p_this )->pp_children[i];
1265 if( p_tmp->psz_object_name
1266 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1268 vlc_object_yield( p_tmp );
1271 else if( vlc_internals( p_tmp )->i_children )
1273 p_tmp = FindObjectName( p_tmp, psz_name, i_mode );
1283 /* Handled in vlc_object_find */
1291 static void PrintObject( vlc_object_t *p_this, const char *psz_prefix )
1293 char psz_children[20], psz_refcount[20], psz_thread[30], psz_name[50],
1296 memset( &psz_name, 0, sizeof(psz_name) );
1297 if( p_this->psz_object_name )
1299 snprintf( psz_name, 49, " \"%s\"", p_this->psz_object_name );
1301 psz_name[48] = '\"';
1304 psz_children[0] = '\0';
1305 switch( vlc_internals( p_this )->i_children )
1310 strcpy( psz_children, ", 1 child" );
1313 snprintf( psz_children, 19, ", %i children",
1314 vlc_internals( p_this )->i_children );
1318 psz_refcount[0] = '\0';
1319 if( vlc_internals( p_this )->i_refcount > 0 )
1320 snprintf( psz_refcount, 19, ", refcount %u",
1321 vlc_internals( p_this )->i_refcount );
1323 psz_thread[0] = '\0';
1324 if( vlc_internals( p_this )->b_thread )
1325 snprintf( psz_thread, 29, " (thread %lu)",
1326 (unsigned long)vlc_internals( p_this )->thread_id );
1328 psz_parent[0] = '\0';
1329 if( p_this->p_parent )
1330 snprintf( psz_parent, 19, ", parent %i", p_this->p_parent->i_object_id );
1332 printf( " %so %.8i %s%s%s%s%s%s\n", psz_prefix,
1333 p_this->i_object_id, p_this->psz_object_type,
1334 psz_name, psz_thread, psz_refcount, psz_children,
1338 static void DumpStructure( vlc_object_t *p_this, int i_level, char *psz_foo )
1341 char i_back = psz_foo[i_level];
1342 psz_foo[i_level] = '\0';
1344 PrintObject( p_this, psz_foo );
1346 psz_foo[i_level] = i_back;
1348 if( i_level / 2 >= MAX_DUMPSTRUCTURE_DEPTH )
1350 msg_Warn( p_this, "structure tree is too deep" );
1354 for( i = 0 ; i < vlc_internals( p_this )->i_children ; i++ )
1358 psz_foo[i_level-1] = ' ';
1360 if( psz_foo[i_level-2] == '`' )
1362 psz_foo[i_level-2] = ' ';
1366 if( i == vlc_internals( p_this )->i_children - 1 )
1368 psz_foo[i_level] = '`';
1372 psz_foo[i_level] = '|';
1375 psz_foo[i_level+1] = '-';
1376 psz_foo[i_level+2] = '\0';
1378 DumpStructure( vlc_internals( p_this )->pp_children[i], i_level + 2,
1383 static vlc_list_t * NewList( int i_count )
1385 vlc_list_t * p_list = (vlc_list_t *)malloc( sizeof( vlc_list_t ) );
1386 if( p_list == NULL )
1391 p_list->i_count = i_count;
1395 p_list->p_values = NULL;
1399 p_list->p_values = malloc( i_count * sizeof( vlc_value_t ) );
1400 if( p_list->p_values == NULL )
1402 p_list->i_count = 0;
1409 static void ListReplace( vlc_list_t *p_list, vlc_object_t *p_object,
1412 if( p_list == NULL || i_index >= p_list->i_count )
1417 vlc_object_yield( p_object );
1419 p_list->p_values[i_index].p_object = p_object;
1424 /*static void ListAppend( vlc_list_t *p_list, vlc_object_t *p_object )
1426 if( p_list == NULL )
1431 p_list->p_values = realloc( p_list->p_values, (p_list->i_count + 1)
1432 * sizeof( vlc_value_t ) );
1433 if( p_list->p_values == NULL )
1435 p_list->i_count = 0;
1439 vlc_object_yield( p_object );
1441 p_list->p_values[p_list->i_count].p_object = p_object;
1447 static int CountChildren( vlc_object_t *p_this, int i_type )
1449 vlc_object_t *p_tmp;
1452 for( i = 0; i < vlc_internals( p_this )->i_children; i++ )
1454 p_tmp = vlc_internals( p_this )->pp_children[i];
1456 if( p_tmp->i_object_type == i_type )
1460 i_count += CountChildren( p_tmp, i_type );
1466 static void ListChildren( vlc_list_t *p_list, vlc_object_t *p_this, int i_type )
1468 vlc_object_t *p_tmp;
1471 for( i = 0; i < vlc_internals( p_this )->i_children; i++ )
1473 p_tmp = vlc_internals( p_this )->pp_children[i];
1475 if( p_tmp->i_object_type == i_type )
1476 ListReplace( p_list, p_tmp, p_list->i_count++ );
1478 ListChildren( p_list, p_tmp, i_type );
1483 void vlc_refcheck (vlc_object_t *obj)
1485 static unsigned errors = 0;
1486 vlc_object_t *caller = vlc_threadobj ();
1487 vlc_object_internals_t *priv = vlc_internals (obj);
1494 return; /* main thread, not sure how to handle it */
1496 /* An object can always access itself without reference! */
1500 /* The calling thread is younger than the object.
1501 * Access could be valid, we would need more accounting. */
1502 if (caller->i_object_id > obj->i_object_id)
1505 vlc_spin_lock (&priv->ref_spin);
1506 refs = priv->i_refcount;
1507 vlc_spin_unlock (&priv->ref_spin);
1509 /* Object has more than one reference.
1510 * The current thread could be holding a valid reference. */
1514 /* The parent of an object normally holds the unique reference.
1515 * As not all objects are threads, it could also be an ancestor. */
1516 vlc_mutex_lock (&structure_lock);
1517 for (vlc_object_t *cur = obj; cur != NULL; cur = cur->p_parent)
1520 vlc_mutex_unlock (&structure_lock);
1523 vlc_mutex_unlock (&structure_lock);
1526 if (caller->i_object_type == VLC_OBJECT_PLAYLIST)
1527 return; /* Playlist is too clever, or hopelessly broken. */
1529 msg_Err (caller, "This thread is accessing...");
1530 msg_Err (obj, "...this object in a suspicious manner.");
1532 if (++errors == 100)
1533 msg_Err (caller, "Too many reference errors");