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 * );
75 static int FindIndex ( vlc_object_t *, vlc_object_t **, int );
77 static vlc_list_t * NewList ( int );
78 static void ListReplace ( vlc_list_t *, vlc_object_t *, int );
79 /*static void ListAppend ( vlc_list_t *, vlc_object_t * );*/
80 static int CountChildren ( vlc_object_t *, int );
81 static void ListChildren ( vlc_list_t *, vlc_object_t *, int );
83 static void vlc_object_destroy( vlc_object_t *p_this );
84 static void vlc_object_detach_unlocked (vlc_object_t *p_this);
86 /*****************************************************************************
87 * Local structure lock
88 *****************************************************************************/
89 static vlc_mutex_t structure_lock;
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_libvlc_global->i_objects = 0;
145 p_libvlc_global->pp_objects = NULL;
146 vlc_mutex_init( &structure_lock );
150 p_libvlc_global = vlc_global();
151 if( i_type == VLC_OBJECT_LIBVLC )
152 p_new->p_libvlc = (libvlc_int_t*)p_new;
154 p_new->p_libvlc = p_this->p_libvlc;
157 vlc_spin_init( &p_priv->ref_spin );
158 p_priv->i_refcount = 1;
159 p_priv->pf_destructor = NULL;
160 p_priv->b_thread = false;
161 p_new->p_parent = NULL;
162 p_priv->pp_children = NULL;
163 p_priv->i_children = 0;
165 p_new->p_private = NULL;
167 /* Initialize mutexes and condvars */
168 vlc_mutex_init( &p_new->object_lock );
169 vlc_cond_init( p_new, &p_new->object_wait );
170 vlc_mutex_init( &p_priv->var_lock );
171 vlc_spin_init( &p_priv->spin );
172 p_priv->pipes[0] = p_priv->pipes[1] = -1;
174 vlc_mutex_lock( &structure_lock );
175 p_new->i_object_id = p_libvlc_global->i_counter++;
176 /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
177 * useless to try and recover anything if pp_objects gets smashed. */
178 TAB_APPEND( p_libvlc_global->i_objects, p_libvlc_global->pp_objects,
180 vlc_mutex_unlock( &structure_lock );
182 if( i_type == VLC_OBJECT_LIBVLC )
184 var_Create( p_new, "list", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
185 var_AddCallback( p_new, "list", DumpCommand, NULL );
186 var_Create( p_new, "tree", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
187 var_AddCallback( p_new, "tree", DumpCommand, NULL );
188 var_Create( p_new, "vars", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
189 var_AddCallback( p_new, "vars", DumpCommand, NULL );
197 * Allocates and initializes a vlc object.
199 * @param i_type known object type (all of them are negative integer values),
200 * or object byte size (always positive).
202 * @return the new object, or NULL on error.
204 void * __vlc_object_create( vlc_object_t *p_this, int i_type )
206 const char * psz_type;
211 case VLC_OBJECT_LIBVLC:
212 i_size = sizeof(libvlc_int_t);
215 case VLC_OBJECT_INTF:
216 i_size = sizeof(intf_thread_t);
217 psz_type = "interface";
219 case VLC_OBJECT_DIALOGS:
220 i_size = sizeof(intf_thread_t);
221 psz_type = "dialogs";
223 case VLC_OBJECT_DEMUX:
224 i_size = sizeof(demux_t);
227 case VLC_OBJECT_ACCESS:
228 i_size = sizeof(access_t);
231 case VLC_OBJECT_DECODER:
232 i_size = sizeof(decoder_t);
233 psz_type = "decoder";
235 case VLC_OBJECT_PACKETIZER:
236 i_size = sizeof(decoder_t);
237 psz_type = "packetizer";
239 case VLC_OBJECT_ENCODER:
240 i_size = sizeof(encoder_t);
241 psz_type = "encoder";
243 case VLC_OBJECT_FILTER:
244 i_size = sizeof(filter_t);
247 case VLC_OBJECT_VOUT:
248 i_size = sizeof(vout_thread_t);
249 psz_type = "video output";
251 case VLC_OBJECT_AOUT:
252 i_size = sizeof(aout_instance_t);
253 psz_type = "audio output";
255 case VLC_OBJECT_SOUT:
256 i_size = sizeof(sout_instance_t);
257 psz_type = "stream output";
259 case VLC_OBJECT_OPENGL:
260 i_size = sizeof( vout_thread_t );
263 case VLC_OBJECT_ANNOUNCE:
264 i_size = sizeof( announce_handler_t );
265 psz_type = "announce";
267 case VLC_OBJECT_INTERACTION:
268 i_size = sizeof( interaction_t );
269 psz_type = "interaction";
272 i_size = i_type > (int)sizeof(vlc_object_t)
273 ? i_type : (int)sizeof(vlc_object_t);
274 i_type = VLC_OBJECT_GENERIC;
275 psz_type = "generic";
279 return vlc_custom_create( p_this, i_size, i_type, psz_type );
284 ****************************************************************************
285 * Set the destructor of a vlc object
287 * This function sets the destructor of the vlc object. It will be called
288 * when the object is destroyed when the its refcount reaches 0.
289 * (It is called by the internal function vlc_object_destroy())
290 *****************************************************************************/
291 void __vlc_object_set_destructor( vlc_object_t *p_this,
292 vlc_destructor_t pf_destructor )
294 vlc_object_internals_t *p_priv = vlc_internals(p_this );
295 p_priv->pf_destructor = pf_destructor;
299 ****************************************************************************
300 * Destroy a vlc object (Internal)
302 * This function destroys an object that has been previously allocated with
303 * vlc_object_create. The object's refcount must be zero and it must not be
304 * attached to other objects in any way.
305 *****************************************************************************/
306 static void vlc_object_destroy( vlc_object_t *p_this )
308 vlc_object_internals_t *p_priv = vlc_internals( p_this );
310 /* Objects are always detached beforehand */
311 assert( !p_this->p_parent );
313 /* Send a kill to the object's thread if applicable */
314 vlc_object_kill( p_this );
316 /* If we are running on a thread, wait until it ends */
317 if( p_priv->b_thread )
318 vlc_thread_join( p_this );
320 /* Call the custom "subclass" destructor */
321 if( p_priv->pf_destructor )
322 p_priv->pf_destructor( p_this );
324 /* Destroy the associated variables, starting from the end so that
325 * no memmove calls have to be done. */
326 while( p_priv->i_vars )
328 var_Destroy( p_this, p_priv->p_vars[p_priv->i_vars - 1].psz_name );
331 free( p_priv->p_vars );
332 vlc_mutex_destroy( &p_priv->var_lock );
334 free( p_this->psz_header );
336 if( p_this->p_libvlc == NULL )
338 libvlc_global_data_t *p_global = (libvlc_global_data_t *)p_this;
341 assert( p_global == vlc_global() );
343 if( p_global->i_objects > 0 )
346 for( i = 0; i < p_global->i_objects; i++ )
348 /* We are leaking this object */
350 "ERROR: leaking object (id:%i, type:%s, name:%s)\n",
351 p_global->pp_objects[i]->i_object_id,
352 p_global->pp_objects[i]->psz_object_type,
353 p_global->pp_objects[i]->psz_object_name );
355 /* Dump libvlc object to ease debugging */
356 vlc_object_dump( p_global->pp_objects[i] );
361 /* Dump libvlc object to ease debugging */
362 vlc_object_dump( p_this );
364 /* Strongly abort, cause we want these to be fixed */
369 /* We are the global object ... no need to lock. */
370 free( p_global->pp_objects );
371 p_global->pp_objects = NULL;
373 vlc_mutex_destroy( &structure_lock );
376 FREENULL( p_this->psz_object_name );
378 #if defined(WIN32) || defined(UNDER_CE)
379 /* if object has an associated thread, close it now */
380 if( p_priv->thread_id )
381 CloseHandle(p_priv->thread_id);
384 vlc_spin_destroy( &p_priv->ref_spin );
385 vlc_mutex_destroy( &p_this->object_lock );
386 vlc_cond_destroy( &p_this->object_wait );
387 vlc_spin_destroy( &p_priv->spin );
388 if( p_priv->pipes[1] != -1 )
389 close( p_priv->pipes[1] );
390 if( p_priv->pipes[0] != -1 )
391 close( p_priv->pipes[0] );
397 /** Inter-object signaling */
399 void __vlc_object_lock( vlc_object_t *obj )
401 vlc_mutex_lock( &obj->object_lock );
404 void __vlc_object_unlock( vlc_object_t *obj )
406 vlc_assert_locked( &obj->object_lock );
407 vlc_mutex_unlock( &obj->object_lock );
411 # include <winsock2.h>
412 # include <ws2tcpip.h>
415 * select()-able pipes emulated using Winsock
417 static int pipe (int fd[2])
420 int addrlen = sizeof (addr);
422 SOCKET l = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP), a,
423 c = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
424 if ((l == INVALID_SOCKET) || (c == INVALID_SOCKET))
427 memset (&addr, 0, sizeof (addr));
428 addr.sin_family = AF_INET;
429 addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
430 if (bind (l, (PSOCKADDR)&addr, sizeof (addr))
431 || getsockname (l, (PSOCKADDR)&addr, &addrlen)
433 || connect (c, (PSOCKADDR)&addr, addrlen))
436 a = accept (l, NULL, NULL);
437 if (a == INVALID_SOCKET)
448 if (l != INVALID_SOCKET)
450 if (c != INVALID_SOCKET)
456 #define read( a, b, c ) recv (a, b, c, 0)
458 #define write( a, b, c ) send (a, b, c, 0)
460 #define close( a ) closesocket (a)
464 * Returns the readable end of a pipe that becomes readable once termination
465 * of the object is requested (vlc_object_kill()).
466 * This can be used to wake-up out of a select() or poll() event loop, such
467 * typically when doing network I/O.
469 * Note that the pipe will remain the same for the lifetime of the object.
470 * DO NOT read the pipe nor close it yourself. Ever.
472 * @param obj object that would be "killed"
473 * @return a readable pipe descriptor, or -1 on error.
475 int __vlc_object_waitpipe( vlc_object_t *obj )
477 int pfd[2] = { -1, -1 };
478 vlc_object_internals_t *internals = vlc_internals( obj );
481 vlc_spin_lock (&internals->spin);
482 if (internals->pipes[0] == -1)
484 /* This can only ever happen if someone killed us without locking: */
485 assert (internals->pipes[1] == -1);
486 vlc_spin_unlock (&internals->spin);
491 vlc_spin_lock (&internals->spin);
492 if (internals->pipes[0] == -1)
494 internals->pipes[0] = pfd[0];
495 internals->pipes[1] = pfd[1];
496 pfd[0] = pfd[1] = -1;
500 vlc_spin_unlock (&internals->spin);
504 /* Race condition: vlc_object_kill() already invoked! */
507 vlc_spin_lock (&internals->spin);
508 fd = internals->pipes[1];
509 internals->pipes[1] = -1;
510 vlc_spin_unlock (&internals->spin);
512 msg_Dbg (obj, "waitpipe: object already dying");
517 /* Race condition: two threads call pipe() - unlikely */
523 return internals->pipes[0];
528 * Waits for the object to be signaled (using vlc_object_signal()).
529 * If the object already has a signal pending, this function will return
530 * immediately. It is asserted that the caller holds the object lock.
532 * @return true if the object is dying and should terminate.
534 bool __vlc_object_wait( vlc_object_t *obj )
536 vlc_assert_locked( &obj->object_lock );
537 vlc_cond_wait( &obj->object_wait, &obj->object_lock );
543 * Waits for the object to be signaled (using vlc_object_signal()), or for
545 * If the object already has a signal pending, this function will return
546 * immediately. It is asserted that the caller holds the object lock.
548 * @return negative if the object is dying and should terminate,
549 * positive if the the object has been signaled but is not dying,
550 * 0 if timeout has been reached.
552 int __vlc_object_timedwait( vlc_object_t *obj, mtime_t deadline )
556 vlc_assert_locked( &obj->object_lock );
557 v = vlc_cond_timedwait( &obj->object_wait, &obj->object_lock, deadline );
558 if( v == 0 ) /* signaled */
559 return obj->b_die ? -1 : 1;
565 * Checks whether an object has been "killed".
566 * The object lock must be held.
568 * Typical code for an object thread could be:
570 vlc_object_lock (self);
572 while (vlc_object_alive (self))
576 if (vlc_object_wait (self))
581 ...deinitialization...
582 vlc_object_unlock (self);
585 * @return true iff the object has not been killed yet
587 bool __vlc_object_alive( vlc_object_t *obj )
589 vlc_assert_locked( &obj->object_lock );
595 * Signals an object for which the lock is held.
597 void __vlc_object_signal_unlocked( vlc_object_t *obj )
599 vlc_assert_locked (&obj->object_lock);
600 vlc_cond_signal( &obj->object_wait );
605 * Requests termination of an object.
606 * If the object is LibVLC, also request to terminate all its children.
608 void __vlc_object_kill( vlc_object_t *p_this )
610 vlc_object_internals_t *internals = vlc_internals( p_this );
613 vlc_mutex_lock( &p_this->object_lock );
614 p_this->b_die = true;
616 vlc_spin_lock (&internals->spin);
617 fd = internals->pipes[1];
618 internals->pipes[1] = -1;
619 vlc_spin_unlock (&internals->spin);
623 msg_Dbg (p_this, "waitpipe: object killed");
627 if( p_this->i_object_type == VLC_OBJECT_LIBVLC )
628 for( int i = 0; i < internals->i_children ; i++ )
629 vlc_object_kill( internals->pp_children[i] );
631 vlc_object_signal_unlocked( p_this );
632 vlc_mutex_unlock( &p_this->object_lock );
637 * Find an object given its ID.
639 * This function looks for the object whose i_object_id field is i_id.
640 * This function is slow, and often used to hide bugs. Do not use it.
641 * If you need to retain reference to an object, yield the object pointer with
642 * vlc_object_yield(), use the pointer as your reference, and call
643 * vlc_object_release() when you're done.
645 void * vlc_object_get( int i_id )
648 vlc_object_t **pp_objects;
649 libvlc_global_data_t *p_libvlc_global = vlc_global();
650 vlc_object_t *obj = NULL;
652 vlc_mutex_lock( &structure_lock );
654 pp_objects = p_libvlc_global->pp_objects;
656 /* Perform our dichotomy */
657 for( i_max = p_libvlc_global->i_objects - 1 ; ; )
659 i_middle = i_max / 2;
661 if( pp_objects[i_middle]->i_object_id > i_id )
665 else if( pp_objects[i_middle]->i_object_id < i_id )
669 pp_objects += i_middle;
674 /* This happens when there are only two remaining objects */
675 if( pp_objects[i_middle+1]->i_object_id == i_id )
677 vlc_object_yield( pp_objects[i_middle+1] );
678 obj = pp_objects[i_middle+1];
685 vlc_object_yield( pp_objects[i_middle] );
686 obj = pp_objects[i_middle];
691 vlc_mutex_unlock( &structure_lock );
696 ****************************************************************************
697 * find a typed object and increment its refcount
698 *****************************************************************************
699 * This function recursively looks for a given object type. i_mode can be one
700 * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
701 *****************************************************************************/
702 void * __vlc_object_find( vlc_object_t *p_this, int i_type, int i_mode )
704 vlc_object_t *p_found;
706 /* If we are of the requested type ourselves, don't look further */
707 if( !(i_mode & FIND_STRICT) && p_this->i_object_type == i_type )
709 vlc_object_yield( p_this );
713 vlc_mutex_lock( &structure_lock );
715 /* Otherwise, recursively look for the object */
716 if( (i_mode & 0x000f) == FIND_ANYWHERE )
718 vlc_object_t *p_root = p_this;
721 while( p_root->p_parent != NULL &&
722 p_root != VLC_OBJECT( p_this->p_libvlc ) )
724 p_root = p_root->p_parent;
727 p_found = FindObject( p_root, i_type, (i_mode & ~0x000f)|FIND_CHILD );
728 if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
730 p_found = FindObject( VLC_OBJECT( p_this->p_libvlc ),
731 i_type, (i_mode & ~0x000f)|FIND_CHILD );
736 p_found = FindObject( p_this, i_type, i_mode );
739 vlc_mutex_unlock( &structure_lock );
745 ****************************************************************************
746 * find a named object and increment its refcount
747 *****************************************************************************
748 * This function recursively looks for a given object name. i_mode can be one
749 * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
750 *****************************************************************************/
751 void * __vlc_object_find_name( vlc_object_t *p_this, const char *psz_name,
754 vlc_object_t *p_found;
756 /* If have the requested name ourselves, don't look further */
757 if( !(i_mode & FIND_STRICT)
758 && p_this->psz_object_name
759 && !strcmp( p_this->psz_object_name, psz_name ) )
761 vlc_object_yield( p_this );
765 vlc_mutex_lock( &structure_lock );
767 /* Otherwise, recursively look for the object */
768 if( (i_mode & 0x000f) == FIND_ANYWHERE )
770 vlc_object_t *p_root = p_this;
773 while( p_root->p_parent != NULL &&
774 p_root != VLC_OBJECT( p_this->p_libvlc ) )
776 p_root = p_root->p_parent;
779 p_found = FindObjectName( p_root, psz_name,
780 (i_mode & ~0x000f)|FIND_CHILD );
781 if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
783 p_found = FindObjectName( VLC_OBJECT( p_this->p_libvlc ),
784 psz_name, (i_mode & ~0x000f)|FIND_CHILD );
789 p_found = FindObjectName( p_this, psz_name, i_mode );
792 vlc_mutex_unlock( &structure_lock );
798 * Increment an object reference counter.
800 void __vlc_object_yield( vlc_object_t *p_this )
802 vlc_object_internals_t *internals = vlc_internals( p_this );
804 vlc_spin_lock( &internals->ref_spin );
805 /* Avoid obvious freed object uses */
806 assert( internals->i_refcount > 0 );
807 /* Increment the counter */
808 internals->i_refcount++;
809 vlc_spin_unlock( &internals->ref_spin );
812 /*****************************************************************************
813 * decrement an object refcount
814 * And destroy the object if its refcount reach zero.
815 *****************************************************************************/
816 void __vlc_object_release( vlc_object_t *p_this )
818 vlc_object_internals_t *internals = vlc_internals( p_this );
819 bool b_should_destroy;
821 vlc_spin_lock( &internals->ref_spin );
822 assert( internals->i_refcount > 0 );
824 if( internals->i_refcount > 1 )
827 /* There are still other references to the object */
828 internals->i_refcount--;
829 vlc_spin_unlock( &internals->ref_spin );
832 vlc_spin_unlock( &internals->ref_spin );
835 /* Remember that we cannot hold the spin while waiting on the mutex */
836 vlc_mutex_lock( &structure_lock );
837 /* Take the spin again. Note that another thread may have yielded the
838 * object in the (very short) mean time. */
839 vlc_spin_lock( &internals->ref_spin );
840 b_should_destroy = --internals->i_refcount == 0;
841 vlc_spin_unlock( &internals->ref_spin );
843 if( b_should_destroy )
845 /* Remove the object from the table
846 * so that it cannot be encountered by vlc_object_get() */
847 libvlc_global_data_t *p_libvlc_global = vlc_global();
850 i_index = FindIndex( p_this, p_libvlc_global->pp_objects,
851 p_libvlc_global->i_objects );
852 REMOVE_ELEM( p_libvlc_global->pp_objects,
853 p_libvlc_global->i_objects, i_index );
855 /* Detach from parent to protect against FIND_CHILDREN */
856 vlc_object_detach_unlocked (p_this);
857 /* Detach from children to protect against FIND_PARENT */
858 for (int i = 0; i < internals->i_children; i++)
859 internals->pp_children[i]->p_parent = NULL;
862 vlc_mutex_unlock( &structure_lock );
864 if( b_should_destroy )
866 free( internals->pp_children );
867 internals->pp_children = NULL;
868 internals->i_children = 0;
869 vlc_object_destroy( p_this );
874 ****************************************************************************
875 * attach object to a parent object
876 *****************************************************************************
877 * This function sets p_this as a child of p_parent, and p_parent as a parent
878 * of p_this. This link can be undone using vlc_object_detach.
879 *****************************************************************************/
880 void __vlc_object_attach( vlc_object_t *p_this, vlc_object_t *p_parent )
882 if( !p_this ) return;
884 vlc_mutex_lock( &structure_lock );
886 /* Attach the parent to its child */
887 assert (!p_this->p_parent);
888 p_this->p_parent = p_parent;
890 /* Attach the child to its parent */
891 vlc_object_internals_t *priv = vlc_internals( p_parent );
892 INSERT_ELEM( priv->pp_children, priv->i_children, priv->i_children,
895 vlc_mutex_unlock( &structure_lock );
899 static void vlc_object_detach_unlocked (vlc_object_t *p_this)
901 vlc_assert_locked (&structure_lock);
903 if (p_this->p_parent == NULL)
906 vlc_object_internals_t *priv = vlc_internals( p_this->p_parent );
910 /* Remove p_this's parent */
911 p_this->p_parent = NULL;
913 /* Remove all of p_parent's children which are p_this */
914 for( i_index = priv->i_children ; i_index-- ; )
916 if( priv->pp_children[i_index] == p_this )
919 for( i = i_index ; i < priv->i_children ; i++ )
920 priv->pp_children[i] = priv->pp_children[i+1];
924 if( priv->i_children )
926 priv->pp_children = (vlc_object_t **)realloc( priv->pp_children,
927 priv->i_children * sizeof(vlc_object_t *) );
931 /* Special case - don't realloc() to zero to avoid leaking */
932 free( priv->pp_children );
933 priv->pp_children = NULL;
939 ****************************************************************************
940 * detach object from its parent
941 *****************************************************************************
942 * This function removes all links between an object and its parent.
943 *****************************************************************************/
944 void __vlc_object_detach( vlc_object_t *p_this )
946 if( !p_this ) return;
948 vlc_mutex_lock( &structure_lock );
949 if( !p_this->p_parent )
950 msg_Err( p_this, "object is not attached" );
952 vlc_object_detach_unlocked( p_this );
953 vlc_mutex_unlock( &structure_lock );
958 ****************************************************************************
959 * find a list typed objects and increment their refcount
960 *****************************************************************************
961 * This function recursively looks for a given object type. i_mode can be one
962 * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
963 *****************************************************************************/
964 vlc_list_t * __vlc_list_find( vlc_object_t *p_this, int i_type, int i_mode )
969 /* Look for the objects */
970 switch( i_mode & 0x000f )
973 return vlc_list_find (vlc_global (), i_type, FIND_CHILD);
976 vlc_mutex_lock( &structure_lock );
977 i_count = CountChildren( p_this, i_type );
978 p_list = NewList( i_count );
980 /* Check allocation was successful */
981 if( p_list->i_count != i_count )
983 msg_Err( p_this, "list allocation failed!" );
989 ListChildren( p_list, p_this, i_type );
990 vlc_mutex_unlock( &structure_lock );
994 msg_Err( p_this, "unimplemented!" );
995 p_list = NewList( 0 );
1003 * Gets the list of children of an objects, and increment their reference
1005 * @return a list (possibly empty) or NULL in case of error.
1007 vlc_list_t *__vlc_list_children( vlc_object_t *obj )
1010 vlc_object_internals_t *priv = vlc_internals( obj );
1012 vlc_mutex_lock( &structure_lock );
1013 l = NewList( priv->i_children );
1014 for (int i = 0; i < l->i_count; i++)
1016 vlc_object_yield( priv->pp_children[i] );
1017 l->p_values[i].p_object = priv->pp_children[i];
1019 vlc_mutex_unlock( &structure_lock );
1023 /*****************************************************************************
1024 * DumpCommand: print the current vlc structure
1025 *****************************************************************************
1026 * This function prints either an ASCII tree showing the connections between
1027 * vlc objects, and additional information such as their refcount, thread ID,
1028 * etc. (command "tree"), or the same data as a simple list (command "list").
1029 *****************************************************************************/
1030 static int DumpCommand( vlc_object_t *p_this, char const *psz_cmd,
1031 vlc_value_t oldval, vlc_value_t newval, void *p_data )
1033 libvlc_global_data_t *p_libvlc_global = vlc_global();
1035 (void)oldval; (void)p_data;
1036 if( *psz_cmd == 'l' )
1038 vlc_mutex_lock( &structure_lock );
1040 vlc_object_t **pp_current, **pp_end;
1042 pp_current = p_libvlc_global->pp_objects;
1043 pp_end = pp_current + p_libvlc_global->i_objects;
1045 for( ; pp_current < pp_end ; pp_current++ )
1046 PrintObject( *pp_current, "" );
1048 vlc_mutex_unlock( &structure_lock );
1052 vlc_object_t *p_object = NULL;
1054 if( *newval.psz_string )
1057 int i_id = strtol( newval.psz_string, &end, 0 );
1058 if( end != newval.psz_string )
1059 p_object = vlc_object_get( i_id );
1062 /* try using the object's name to find it */
1063 vlc_object_t *p_libvlc = vlc_object_get( 1 );
1066 /* Look in p_libvlc's children tree */
1067 p_object = vlc_object_find_name( p_libvlc,
1070 vlc_object_release( p_libvlc );
1074 /* If it's not in libvlc, look in libvlc_global (== p_this) */
1075 p_object = vlc_object_find_name( p_this,
1087 vlc_mutex_lock( &structure_lock );
1089 if( *psz_cmd == 't' )
1091 char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
1094 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1097 DumpStructure( p_object, 0, psz_foo );
1099 else if( *psz_cmd == 'v' )
1104 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1106 PrintObject( p_object, "" );
1108 if( !vlc_internals( p_object )->i_vars )
1109 printf( " `-o No variables\n" );
1110 for( i = 0; i < vlc_internals( p_object )->i_vars; i++ )
1112 variable_t *p_var = vlc_internals( p_object )->p_vars + i;
1114 const char *psz_type = "unknown";
1115 switch( p_var->i_type & VLC_VAR_TYPE )
1117 #define MYCASE( type, nice ) \
1118 case VLC_VAR_ ## type: \
1121 MYCASE( VOID, "void" );
1122 MYCASE( BOOL, "bool" );
1123 MYCASE( INTEGER, "integer" );
1124 MYCASE( HOTKEY, "hotkey" );
1125 MYCASE( STRING, "string" );
1126 MYCASE( MODULE, "module" );
1127 MYCASE( FILE, "file" );
1128 MYCASE( DIRECTORY, "directory" );
1129 MYCASE( VARIABLE, "variable" );
1130 MYCASE( FLOAT, "float" );
1131 MYCASE( TIME, "time" );
1132 MYCASE( ADDRESS, "address" );
1133 MYCASE( MUTEX, "mutex" );
1134 MYCASE( LIST, "list" );
1137 printf( " %c-o \"%s\" (%s",
1138 i + 1 == vlc_internals( p_object )->i_vars ? '`' : '|',
1139 p_var->psz_name, psz_type );
1140 if( p_var->psz_text )
1141 printf( ", %s", p_var->psz_text );
1143 if( p_var->i_type & VLC_VAR_ISCOMMAND )
1144 printf( ", command" );
1145 if( p_var->i_entries )
1146 printf( ", %d callbacks", p_var->i_entries );
1147 switch( p_var->i_type & 0x00f0 )
1153 printf( ": %s", p_var->val.b_bool ? "true" : "false" );
1155 case VLC_VAR_INTEGER:
1156 printf( ": %d", p_var->val.i_int );
1158 case VLC_VAR_STRING:
1159 printf( ": \"%s\"", p_var->val.psz_string );
1162 printf( ": %f", p_var->val.f_float );
1165 printf( ": %"PRIi64, (int64_t)p_var->val.i_time );
1167 case VLC_VAR_ADDRESS:
1168 printf( ": %p", p_var->val.p_address );
1178 vlc_mutex_unlock( &structure_lock );
1180 if( *newval.psz_string )
1182 vlc_object_release( p_object );
1189 /*****************************************************************************
1190 * vlc_list_release: free a list previously allocated by vlc_list_find
1191 *****************************************************************************
1192 * This function decreases the refcount of all objects in the list and
1194 *****************************************************************************/
1195 void vlc_list_release( vlc_list_t *p_list )
1199 for( i_index = 0; i_index < p_list->i_count; i_index++ )
1201 vlc_object_release( p_list->p_values[i_index].p_object );
1204 free( p_list->p_values );
1208 /*****************************************************************************
1209 * dump an object. (Debug function)
1210 *****************************************************************************/
1211 void __vlc_object_dump( vlc_object_t *p_this )
1213 vlc_mutex_lock( &structure_lock );
1214 char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
1216 DumpStructure( p_this, 0, psz_foo );
1217 vlc_mutex_unlock( &structure_lock );
1220 /* Following functions are local */
1222 /*****************************************************************************
1223 * FindIndex: find the index of an object in an array of objects
1224 *****************************************************************************
1225 * This function assumes that p_this can be found in pp_objects. It will not
1226 * crash if p_this cannot be found, but will return a wrong value. It is your
1227 * duty to check the return value if you are not certain that the object could
1228 * be found for sure.
1229 *****************************************************************************/
1230 static int FindIndex( vlc_object_t *p_this,
1231 vlc_object_t **pp_objects, int i_count )
1233 int i_middle = i_count / 2;
1240 if( pp_objects[i_middle] == p_this )
1250 /* We take advantage of the sorted array */
1251 if( pp_objects[i_middle]->i_object_id < p_this->i_object_id )
1253 return i_middle + FindIndex( p_this, pp_objects + i_middle,
1254 i_count - i_middle );
1258 return FindIndex( p_this, pp_objects, i_middle );
1262 static vlc_object_t * FindObject( vlc_object_t *p_this, int i_type, int i_mode )
1265 vlc_object_t *p_tmp;
1267 switch( i_mode & 0x000f )
1270 p_tmp = p_this->p_parent;
1273 if( p_tmp->i_object_type == i_type )
1275 vlc_object_yield( p_tmp );
1280 return FindObject( p_tmp, i_type, i_mode );
1286 for( i = vlc_internals( p_this )->i_children; i--; )
1288 p_tmp = vlc_internals( p_this )->pp_children[i];
1289 if( p_tmp->i_object_type == i_type )
1291 vlc_object_yield( p_tmp );
1294 else if( vlc_internals( p_tmp )->i_children )
1296 p_tmp = FindObject( p_tmp, i_type, i_mode );
1306 /* Handled in vlc_object_find */
1313 static vlc_object_t * FindObjectName( vlc_object_t *p_this,
1314 const char *psz_name,
1318 vlc_object_t *p_tmp;
1320 switch( i_mode & 0x000f )
1323 p_tmp = p_this->p_parent;
1326 if( p_tmp->psz_object_name
1327 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1329 vlc_object_yield( p_tmp );
1334 return FindObjectName( p_tmp, psz_name, i_mode );
1340 for( i = vlc_internals( p_this )->i_children; i--; )
1342 p_tmp = vlc_internals( p_this )->pp_children[i];
1343 if( p_tmp->psz_object_name
1344 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1346 vlc_object_yield( p_tmp );
1349 else if( vlc_internals( p_tmp )->i_children )
1351 p_tmp = FindObjectName( p_tmp, psz_name, i_mode );
1361 /* Handled in vlc_object_find */
1369 static void PrintObject( vlc_object_t *p_this, const char *psz_prefix )
1371 char psz_children[20], psz_refcount[20], psz_thread[30], psz_name[50],
1374 memset( &psz_name, 0, sizeof(psz_name) );
1375 if( p_this->psz_object_name )
1377 snprintf( psz_name, 49, " \"%s\"", p_this->psz_object_name );
1379 psz_name[48] = '\"';
1382 psz_children[0] = '\0';
1383 switch( vlc_internals( p_this )->i_children )
1388 strcpy( psz_children, ", 1 child" );
1391 snprintf( psz_children, 19, ", %i children",
1392 vlc_internals( p_this )->i_children );
1396 psz_refcount[0] = '\0';
1397 if( vlc_internals( p_this )->i_refcount > 0 )
1398 snprintf( psz_refcount, 19, ", refcount %u",
1399 vlc_internals( p_this )->i_refcount );
1401 psz_thread[0] = '\0';
1402 if( vlc_internals( p_this )->b_thread )
1403 snprintf( psz_thread, 29, " (thread %lu)",
1404 (unsigned long)vlc_internals( p_this )->thread_id );
1406 psz_parent[0] = '\0';
1407 if( p_this->p_parent )
1408 snprintf( psz_parent, 19, ", parent %i", p_this->p_parent->i_object_id );
1410 printf( " %so %.8i %s%s%s%s%s%s\n", psz_prefix,
1411 p_this->i_object_id, p_this->psz_object_type,
1412 psz_name, psz_thread, psz_refcount, psz_children,
1416 static void DumpStructure( vlc_object_t *p_this, int i_level, char *psz_foo )
1419 char i_back = psz_foo[i_level];
1420 psz_foo[i_level] = '\0';
1422 PrintObject( p_this, psz_foo );
1424 psz_foo[i_level] = i_back;
1426 if( i_level / 2 >= MAX_DUMPSTRUCTURE_DEPTH )
1428 msg_Warn( p_this, "structure tree is too deep" );
1432 for( i = 0 ; i < vlc_internals( p_this )->i_children ; i++ )
1436 psz_foo[i_level-1] = ' ';
1438 if( psz_foo[i_level-2] == '`' )
1440 psz_foo[i_level-2] = ' ';
1444 if( i == vlc_internals( p_this )->i_children - 1 )
1446 psz_foo[i_level] = '`';
1450 psz_foo[i_level] = '|';
1453 psz_foo[i_level+1] = '-';
1454 psz_foo[i_level+2] = '\0';
1456 DumpStructure( vlc_internals( p_this )->pp_children[i], i_level + 2,
1461 static vlc_list_t * NewList( int i_count )
1463 vlc_list_t * p_list = (vlc_list_t *)malloc( sizeof( vlc_list_t ) );
1464 if( p_list == NULL )
1469 p_list->i_count = i_count;
1473 p_list->p_values = NULL;
1477 p_list->p_values = malloc( i_count * sizeof( vlc_value_t ) );
1478 if( p_list->p_values == NULL )
1480 p_list->i_count = 0;
1487 static void ListReplace( vlc_list_t *p_list, vlc_object_t *p_object,
1490 if( p_list == NULL || i_index >= p_list->i_count )
1495 vlc_object_yield( p_object );
1497 p_list->p_values[i_index].p_object = p_object;
1502 /*static void ListAppend( vlc_list_t *p_list, vlc_object_t *p_object )
1504 if( p_list == NULL )
1509 p_list->p_values = realloc( p_list->p_values, (p_list->i_count + 1)
1510 * sizeof( vlc_value_t ) );
1511 if( p_list->p_values == NULL )
1513 p_list->i_count = 0;
1517 vlc_object_yield( p_object );
1519 p_list->p_values[p_list->i_count].p_object = p_object;
1525 static int CountChildren( vlc_object_t *p_this, int i_type )
1527 vlc_object_t *p_tmp;
1530 for( i = 0; i < vlc_internals( p_this )->i_children; i++ )
1532 p_tmp = vlc_internals( p_this )->pp_children[i];
1534 if( p_tmp->i_object_type == i_type )
1538 i_count += CountChildren( p_tmp, i_type );
1544 static void ListChildren( vlc_list_t *p_list, vlc_object_t *p_this, int i_type )
1546 vlc_object_t *p_tmp;
1549 for( i = 0; i < vlc_internals( p_this )->i_children; i++ )
1551 p_tmp = vlc_internals( p_this )->pp_children[i];
1553 if( p_tmp->i_object_type == i_type )
1554 ListReplace( p_list, p_tmp, p_list->i_count++ );
1556 ListChildren( p_list, p_tmp, i_type );