1 /*****************************************************************************
2 * objects.c: vlc_object_t handling
3 *****************************************************************************
4 * Copyright (C) 2004-2008 the VideoLAN team
6 * Authors: Samuel Hocevar <sam@zoy.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
21 *****************************************************************************/
25 * This file contains the functions to handle the vlc_object_t type
27 * Unless otherwise stated, functions in this file are not cancellation point.
28 * All functions in this file are safe w.r.t. deferred cancellation.
32 /*****************************************************************************
34 *****************************************************************************/
39 #include <vlc_common.h>
41 #include "../libvlc.h"
44 #include "audio_output/aout_internal.h"
46 #include <vlc_access.h>
47 #include <vlc_demux.h>
48 #include <vlc_stream.h>
51 #include "stream_output/stream_output.h"
53 #include "vlc_interface.h"
54 #include "vlc_codec.h"
55 #include "vlc_filter.h"
57 #include "variables.h"
63 # include <errno.h> /* ENOSYS */
67 /*****************************************************************************
69 *****************************************************************************/
70 static int DumpCommand( vlc_object_t *, char const *,
71 vlc_value_t, vlc_value_t, void * );
73 static vlc_object_t * FindObject ( vlc_object_t *, int, int );
74 static vlc_object_t * FindObjectName( vlc_object_t *, const char *, int );
75 static void PrintObject ( vlc_object_t *, const char * );
76 static void DumpStructure ( vlc_object_t *, int, char * );
78 static vlc_list_t * NewList ( int );
79 static void ListReplace ( vlc_list_t *, vlc_object_t *, int );
80 /*static void ListAppend ( vlc_list_t *, vlc_object_t * );*/
81 static int CountChildren ( vlc_object_t *, int );
82 static void ListChildren ( vlc_list_t *, vlc_object_t *, int );
84 static void vlc_object_destroy( vlc_object_t *p_this );
85 static void vlc_object_detach_unlocked (vlc_object_t *p_this);
86 static void vlc_object_dump( vlc_object_t *p_this );
88 /*****************************************************************************
89 * Local structure lock
90 *****************************************************************************/
91 static vlc_mutex_t structure_lock;
92 static unsigned object_counter = 0;
94 static void close_nocancel (int fd)
96 int canc = vlc_savecancel ();
98 vlc_restorecancel (canc);
101 void *__vlc_custom_create( vlc_object_t *p_this, size_t i_size,
102 int i_type, const char *psz_type )
105 vlc_object_internals_t *p_priv;
108 * VLC objects are laid out as follow:
109 * - first the LibVLC-private per-object data,
110 * - then VLC_COMMON members from vlc_object_t,
111 * - finally, the type-specific data (if any).
113 * This function initializes the LibVLC and common data,
114 * and zeroes the rest.
116 p_priv = calloc( 1, sizeof( *p_priv ) + i_size );
120 assert (i_size >= sizeof (vlc_object_t));
121 p_new = (vlc_object_t *)(p_priv + 1);
123 p_new->i_object_type = i_type;
124 p_new->psz_object_type = psz_type;
125 p_new->psz_object_name = NULL;
127 p_new->b_die = false;
128 p_new->b_error = false;
129 p_new->b_dead = false;
130 p_new->b_force = false;
132 p_new->psz_header = NULL;
135 p_new->i_flags = p_this->i_flags
136 & (OBJECT_FLAGS_NODBG|OBJECT_FLAGS_QUIET|OBJECT_FLAGS_NOINTERACT);
138 p_priv->p_vars = calloc( sizeof( variable_t ), 16 );
140 if( !p_priv->p_vars )
148 if( i_type == VLC_OBJECT_LIBVLC )
149 p_new->p_libvlc = (libvlc_int_t*)p_new;
152 p_new->p_libvlc = NULL;
153 vlc_mutex_init( &structure_lock );
156 p_this = p_priv->next = p_priv->prev = p_new;
159 p_new->p_libvlc = p_this->p_libvlc;
161 vlc_spin_init( &p_priv->ref_spin );
162 p_priv->i_refcount = 1;
163 p_priv->pf_destructor = NULL;
164 p_priv->b_thread = false;
165 p_new->p_parent = NULL;
166 p_priv->pp_children = NULL;
167 p_priv->i_children = 0;
169 p_new->p_private = NULL;
171 /* Initialize mutexes and condvars */
172 vlc_mutex_init( &p_priv->lock );
173 vlc_cond_init( &p_priv->wait );
174 vlc_mutex_init( &p_priv->var_lock );
175 vlc_spin_init( &p_priv->spin );
176 p_priv->pipes[0] = p_priv->pipes[1] = -1;
178 p_priv->next = p_this;
179 vlc_mutex_lock( &structure_lock );
180 p_priv->prev = vlc_internals (p_this)->prev;
181 vlc_internals (p_this)->prev = p_new;
182 vlc_internals (p_priv->prev)->next = p_new;
183 p_new->i_object_id = object_counter++; /* fetch THEN increment */
184 vlc_mutex_unlock( &structure_lock );
186 if( i_type == VLC_OBJECT_LIBVLC )
188 int canc = vlc_savecancel ();
189 var_Create( p_new, "list", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
190 var_AddCallback( p_new, "list", DumpCommand, NULL );
191 var_Create( p_new, "tree", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
192 var_AddCallback( p_new, "tree", DumpCommand, NULL );
193 var_Create( p_new, "vars", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
194 var_AddCallback( p_new, "vars", DumpCommand, NULL );
195 vlc_restorecancel (canc);
203 * Allocates and initializes a vlc object.
205 * @param i_type known object type (all of them are negative integer values),
206 * or object byte size (always positive).
208 * @return the new object, or NULL on error.
210 void * __vlc_object_create( vlc_object_t *p_this, int i_type )
212 const char * psz_type;
217 case VLC_OBJECT_INTF:
218 i_size = sizeof(intf_thread_t);
219 psz_type = "interface";
221 case VLC_OBJECT_DECODER:
222 i_size = sizeof(decoder_t);
223 psz_type = "decoder";
225 case VLC_OBJECT_PACKETIZER:
226 i_size = sizeof(decoder_t);
227 psz_type = "packetizer";
229 case VLC_OBJECT_ENCODER:
230 i_size = sizeof(encoder_t);
231 psz_type = "encoder";
233 case VLC_OBJECT_AOUT:
234 i_size = sizeof(aout_instance_t);
235 psz_type = "audio output";
237 case VLC_OBJECT_OPENGL:
238 i_size = sizeof( vout_thread_t );
241 case VLC_OBJECT_ANNOUNCE:
242 i_size = sizeof( announce_handler_t );
243 psz_type = "announce";
246 assert( i_type > 0 ); /* unknown type?! */
248 i_type = VLC_OBJECT_GENERIC;
249 psz_type = "generic";
253 return vlc_custom_create( p_this, i_size, i_type, psz_type );
258 ****************************************************************************
259 * Set the destructor of a vlc object
261 * This function sets the destructor of the vlc object. It will be called
262 * when the object is destroyed when the its refcount reaches 0.
263 * (It is called by the internal function vlc_object_destroy())
264 *****************************************************************************/
265 void __vlc_object_set_destructor( vlc_object_t *p_this,
266 vlc_destructor_t pf_destructor )
268 vlc_object_internals_t *p_priv = vlc_internals(p_this );
269 p_priv->pf_destructor = pf_destructor;
273 ****************************************************************************
274 * Destroy a vlc object (Internal)
276 * This function destroys an object that has been previously allocated with
277 * vlc_object_create. The object's refcount must be zero and it must not be
278 * attached to other objects in any way.
280 * This function must be called with cancellation disabled (currently).
281 *****************************************************************************/
282 static void vlc_object_destroy( vlc_object_t *p_this )
284 vlc_object_internals_t *p_priv = vlc_internals( p_this );
286 /* Objects are always detached beforehand */
287 assert( !p_this->p_parent );
289 /* Send a kill to the object's thread if applicable */
290 vlc_object_kill( p_this );
292 /* Call the custom "subclass" destructor */
293 if( p_priv->pf_destructor )
294 p_priv->pf_destructor( p_this );
296 /* Any thread must have been cleaned up at this point. */
297 assert( !p_priv->b_thread );
299 /* Destroy the associated variables, starting from the end so that
300 * no memmove calls have to be done. */
301 while( p_priv->i_vars )
303 var_Destroy( p_this, p_priv->p_vars[p_priv->i_vars - 1].psz_name );
306 free( p_priv->p_vars );
307 vlc_mutex_destroy( &p_priv->var_lock );
309 free( p_this->psz_header );
311 if( p_this->p_libvlc == NULL )
312 /* We are the global object ... no need to lock. */
313 vlc_mutex_destroy( &structure_lock );
315 FREENULL( p_this->psz_object_name );
317 #if defined(WIN32) || defined(UNDER_CE)
318 /* if object has an associated thread, close it now */
319 if( p_priv->thread_id )
320 CloseHandle(p_priv->thread_id);
323 vlc_spin_destroy( &p_priv->ref_spin );
324 vlc_mutex_destroy( &p_priv->lock );
325 vlc_cond_destroy( &p_priv->wait );
326 vlc_spin_destroy( &p_priv->spin );
327 if( p_priv->pipes[1] != -1 )
328 close( p_priv->pipes[1] );
329 if( p_priv->pipes[0] != -1 )
330 close( p_priv->pipes[0] );
336 /** Inter-object signaling */
338 void __vlc_object_lock( vlc_object_t *obj )
340 vlc_mutex_lock( &(vlc_internals(obj)->lock) );
343 void __vlc_object_unlock( vlc_object_t *obj )
345 vlc_assert_locked( &(vlc_internals(obj)->lock) );
346 vlc_mutex_unlock( &(vlc_internals(obj)->lock) );
350 # include <winsock2.h>
351 # include <ws2tcpip.h>
354 * select()-able pipes emulated using Winsock
356 static int pipe (int fd[2])
359 int addrlen = sizeof (addr);
361 SOCKET l = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP), a,
362 c = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
363 if ((l == INVALID_SOCKET) || (c == INVALID_SOCKET))
366 memset (&addr, 0, sizeof (addr));
367 addr.sin_family = AF_INET;
368 addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
369 if (bind (l, (PSOCKADDR)&addr, sizeof (addr))
370 || getsockname (l, (PSOCKADDR)&addr, &addrlen)
372 || connect (c, (PSOCKADDR)&addr, addrlen))
375 a = accept (l, NULL, NULL);
376 if (a == INVALID_SOCKET)
387 if (l != INVALID_SOCKET)
389 if (c != INVALID_SOCKET)
395 #define read( a, b, c ) recv (a, b, c, 0)
397 #define write( a, b, c ) send (a, b, c, 0)
399 #define close( a ) closesocket (a)
403 * Returns the readable end of a pipe that becomes readable once termination
404 * of the object is requested (vlc_object_kill()).
405 * This can be used to wake-up out of a select() or poll() event loop, such
406 * typically when doing network I/O.
408 * Note that the pipe will remain the same for the lifetime of the object.
409 * DO NOT read the pipe nor close it yourself. Ever.
411 * @param obj object that would be "killed"
412 * @return a readable pipe descriptor, or -1 on error.
414 int __vlc_object_waitpipe( vlc_object_t *obj )
416 int pfd[2] = { -1, -1 };
417 vlc_object_internals_t *internals = vlc_internals( obj );
420 vlc_spin_lock (&internals->spin);
421 if (internals->pipes[0] == -1)
423 /* This can only ever happen if someone killed us without locking: */
424 assert (internals->pipes[1] == -1);
425 vlc_spin_unlock (&internals->spin);
430 vlc_spin_lock (&internals->spin);
431 if (internals->pipes[0] == -1)
433 internals->pipes[0] = pfd[0];
434 internals->pipes[1] = pfd[1];
435 pfd[0] = pfd[1] = -1;
439 vlc_spin_unlock (&internals->spin);
443 /* Race condition: vlc_object_kill() already invoked! */
446 vlc_spin_lock (&internals->spin);
447 fd = internals->pipes[1];
448 internals->pipes[1] = -1;
449 vlc_spin_unlock (&internals->spin);
451 msg_Dbg (obj, "waitpipe: object already dying");
456 /* Race condition: two threads call pipe() - unlikely */
462 return internals->pipes[0];
467 * Suspends until another thread calls vlc_object_signal_unlocked().
468 * The thread may be woken up earlier due to limitations of the underlying
471 * In new code, please use vlc_cond_wait() instead.
473 * This function is a cancellation point. In case of cancellation, the object
474 * will be in locked state.
476 void __vlc_object_wait( vlc_object_t *obj )
478 vlc_object_internals_t *priv = vlc_internals( obj );
479 vlc_assert_locked( &priv->lock);
480 vlc_cond_wait( &priv->wait, &priv->lock );
485 * Wakes up one thread waiting on the object. If no thread are (yet) waiting,
488 * Please do not use this function in new code as we are trying to untangle
489 * objects and threads. Use vlc_cond_wait() instead.
491 void __vlc_object_signal_unlocked( vlc_object_t *obj )
493 vlc_assert_locked (&(vlc_internals(obj)->lock));
494 vlc_cond_signal( &(vlc_internals(obj)->wait) );
499 * Requests termination of an object.
500 * If the object is LibVLC, also request to terminate all its children.
502 void __vlc_object_kill( vlc_object_t *p_this )
504 vlc_object_internals_t *priv = vlc_internals( p_this );
507 vlc_thread_cancel( p_this );
508 vlc_object_lock( p_this );
509 p_this->b_die = true;
511 vlc_spin_lock (&priv->spin);
514 vlc_spin_unlock (&priv->spin);
518 msg_Dbg (p_this, "waitpipe: object killed");
522 vlc_cond_broadcast (&priv->wait);
523 /* This also serves as a memory barrier toward vlc_object_alive(): */
524 vlc_object_unlock( p_this );
529 * Find an object given its ID.
531 * This function looks for the object whose i_object_id field is i_id.
532 * This function is slow, and often used to hide bugs. Do not use it.
533 * If you need to retain reference to an object, yield the object pointer with
534 * vlc_object_yield(), use the pointer as your reference, and call
535 * vlc_object_release() when you're done.
537 void * vlc_object_get( libvlc_int_t *p_anchor, int i_id )
539 vlc_object_t *obj = NULL;
541 int canc = vlc_savecancel ();
542 fprintf (stderr, "Use of deprecated vlc_object_get(%d) ", i_id);
544 vlc_restorecancel (canc);
546 vlc_mutex_lock( &structure_lock );
548 for( obj = vlc_internals (p_anchor)->next;
549 obj != VLC_OBJECT (p_anchor);
550 obj = vlc_internals (obj)->next )
552 if( obj->i_object_id == i_id )
554 vlc_object_yield( obj );
560 fprintf (stderr, "Object %d does not exist\n", i_id);
563 vlc_mutex_unlock( &structure_lock );
568 ****************************************************************************
569 * find a typed object and increment its refcount
570 *****************************************************************************
571 * This function recursively looks for a given object type. i_mode can be one
572 * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
573 *****************************************************************************/
574 void * __vlc_object_find( vlc_object_t *p_this, int i_type, int i_mode )
576 vlc_object_t *p_found;
578 /* If we are of the requested type ourselves, don't look further */
579 if( !(i_mode & FIND_STRICT) && p_this->i_object_type == i_type )
581 vlc_object_yield( p_this );
585 /* Otherwise, recursively look for the object */
586 if ((i_mode & 0x000f) == FIND_ANYWHERE)
589 if (i_type == VLC_OBJECT_PLAYLIST)
590 msg_Err (p_this, "using vlc_object_find(VLC_OBJECT_PLAYLIST) "
591 "instead of pl_Yield()");
593 return vlc_object_find (p_this->p_libvlc, i_type,
594 (i_mode & ~0x000f)|FIND_CHILD);
597 vlc_mutex_lock( &structure_lock );
598 p_found = FindObject( p_this, i_type, i_mode );
599 vlc_mutex_unlock( &structure_lock );
603 #undef vlc_object_find_name
605 * Finds a named object and increment its reference count.
606 * Beware that objects found in this manner can be "owned" by another thread,
607 * be of _any_ type, and be attached to any module (if any). With such an
608 * object reference, you can set or get object variables, emit log messages,
609 * and read write-once object parameters (i_object_id, psz_object_type, etc).
610 * You CANNOT cast the object to a more specific object type, and you
611 * definitely cannot invoke object type-specific callbacks with this.
613 * @param p_this object to search from
614 * @param psz_name name of the object to search for
615 * @param i_mode search direction: FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
617 * @return a matching object (must be released by the caller),
620 vlc_object_t *vlc_object_find_name( vlc_object_t *p_this,
621 const char *psz_name, int i_mode )
623 vlc_object_t *p_found;
625 /* If have the requested name ourselves, don't look further */
626 if( !(i_mode & FIND_STRICT)
627 && p_this->psz_object_name
628 && !strcmp( p_this->psz_object_name, psz_name ) )
630 vlc_object_yield( p_this );
634 vlc_mutex_lock( &structure_lock );
636 /* Otherwise, recursively look for the object */
637 if( (i_mode & 0x000f) == FIND_ANYWHERE )
639 vlc_object_t *p_root = p_this;
642 while( p_root->p_parent != NULL &&
643 p_root != VLC_OBJECT( p_this->p_libvlc ) )
645 p_root = p_root->p_parent;
648 p_found = FindObjectName( p_root, psz_name,
649 (i_mode & ~0x000f)|FIND_CHILD );
650 if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
652 p_found = FindObjectName( VLC_OBJECT( p_this->p_libvlc ),
653 psz_name, (i_mode & ~0x000f)|FIND_CHILD );
658 p_found = FindObjectName( p_this, psz_name, i_mode );
661 vlc_mutex_unlock( &structure_lock );
667 * Increment an object reference counter.
669 void __vlc_object_yield( vlc_object_t *p_this )
671 vlc_object_internals_t *internals = vlc_internals( p_this );
673 vlc_spin_lock( &internals->ref_spin );
674 /* Avoid obvious freed object uses */
675 assert( internals->i_refcount > 0 );
676 /* Increment the counter */
677 internals->i_refcount++;
678 vlc_spin_unlock( &internals->ref_spin );
681 /*****************************************************************************
682 * Decrement an object refcount
683 * And destroy the object if its refcount reach zero.
684 *****************************************************************************/
685 void __vlc_object_release( vlc_object_t *p_this )
687 vlc_object_internals_t *internals = vlc_internals( p_this );
688 bool b_should_destroy;
690 vlc_spin_lock( &internals->ref_spin );
691 assert( internals->i_refcount > 0 );
693 if( internals->i_refcount > 1 )
696 /* There are still other references to the object */
697 internals->i_refcount--;
698 vlc_spin_unlock( &internals->ref_spin );
701 vlc_spin_unlock( &internals->ref_spin );
704 /* Remember that we cannot hold the spin while waiting on the mutex */
705 vlc_mutex_lock( &structure_lock );
706 /* Take the spin again. Note that another thread may have yielded the
707 * object in the (very short) mean time. */
708 vlc_spin_lock( &internals->ref_spin );
709 b_should_destroy = --internals->i_refcount == 0;
710 vlc_spin_unlock( &internals->ref_spin );
712 if( b_should_destroy )
715 if( VLC_OBJECT(p_this->p_libvlc) == p_this )
718 vlc_object_t *leaked = internals->next;
719 while( leaked != p_this )
721 /* We are leaking this object */
723 "ERROR: leaking object (id:%i, type:%s, name:%s)\n",
724 leaked->i_object_id, leaked->psz_object_type,
725 leaked->psz_object_name );
726 /* Dump object to ease debugging */
727 vlc_object_dump( leaked );
729 leaked = vlc_internals (leaked)->next;
732 if( internals->next != p_this )
733 /* Dump libvlc object to ease debugging */
734 vlc_object_dump( p_this );
737 /* Remove the object from object list
738 * so that it cannot be encountered by vlc_object_get() */
739 vlc_internals (internals->next)->prev = internals->prev;
740 vlc_internals (internals->prev)->next = internals->next;
742 /* Detach from parent to protect against FIND_CHILDREN */
743 vlc_object_detach_unlocked (p_this);
744 /* Detach from children to protect against FIND_PARENT */
745 for (int i = 0; i < internals->i_children; i++)
746 internals->pp_children[i]->p_parent = NULL;
749 vlc_mutex_unlock( &structure_lock );
751 if( b_should_destroy )
755 free( internals->pp_children );
756 internals->pp_children = NULL;
757 internals->i_children = 0;
758 canc = vlc_savecancel ();
759 vlc_object_destroy( p_this );
760 vlc_restorecancel (canc);
765 ****************************************************************************
766 * attach object to a parent object
767 *****************************************************************************
768 * This function sets p_this as a child of p_parent, and p_parent as a parent
769 * of p_this. This link can be undone using vlc_object_detach.
770 *****************************************************************************/
771 void __vlc_object_attach( vlc_object_t *p_this, vlc_object_t *p_parent )
773 if( !p_this ) return;
775 vlc_mutex_lock( &structure_lock );
777 /* Attach the parent to its child */
778 assert (!p_this->p_parent);
779 p_this->p_parent = p_parent;
781 /* Attach the child to its parent */
782 vlc_object_internals_t *priv = vlc_internals( p_parent );
783 INSERT_ELEM( priv->pp_children, priv->i_children, priv->i_children,
786 vlc_mutex_unlock( &structure_lock );
790 static void vlc_object_detach_unlocked (vlc_object_t *p_this)
792 vlc_assert_locked (&structure_lock);
794 if (p_this->p_parent == NULL)
797 vlc_object_internals_t *priv = vlc_internals( p_this->p_parent );
801 /* Remove p_this's parent */
802 p_this->p_parent = NULL;
804 /* Remove all of p_parent's children which are p_this */
805 for( i_index = priv->i_children ; i_index-- ; )
807 if( priv->pp_children[i_index] == p_this )
810 for( i = i_index ; i < priv->i_children ; i++ )
811 priv->pp_children[i] = priv->pp_children[i+1];
815 if( priv->i_children )
817 priv->pp_children = (vlc_object_t **)realloc( priv->pp_children,
818 priv->i_children * sizeof(vlc_object_t *) );
822 /* Special case - don't realloc() to zero to avoid leaking */
823 free( priv->pp_children );
824 priv->pp_children = NULL;
830 ****************************************************************************
831 * detach object from its parent
832 *****************************************************************************
833 * This function removes all links between an object and its parent.
834 *****************************************************************************/
835 void __vlc_object_detach( vlc_object_t *p_this )
837 if( !p_this ) return;
839 vlc_mutex_lock( &structure_lock );
840 if( !p_this->p_parent )
841 msg_Err( p_this, "object is not attached" );
843 vlc_object_detach_unlocked( p_this );
844 vlc_mutex_unlock( &structure_lock );
849 ****************************************************************************
850 * find a list typed objects and increment their refcount
851 *****************************************************************************
852 * This function recursively looks for a given object type. i_mode can be one
853 * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
854 *****************************************************************************/
855 vlc_list_t * __vlc_list_find( vlc_object_t *p_this, int i_type, int i_mode )
860 /* Look for the objects */
861 switch( i_mode & 0x000f )
864 /* Modules should probably not be object, and the module should perhaps
865 * not be shared across LibVLC instances. In the mean time, this ugly
866 * hack is brought to you by Courmisch. */
867 if (i_type == VLC_OBJECT_MODULE)
868 return vlc_list_find ((vlc_object_t *)p_module_bank,
870 return vlc_list_find (p_this->p_libvlc, i_type, FIND_CHILD);
873 vlc_mutex_lock( &structure_lock );
874 i_count = CountChildren( p_this, i_type );
875 p_list = NewList( i_count );
877 /* Check allocation was successful */
878 if( p_list->i_count != i_count )
880 vlc_mutex_unlock( &structure_lock );
881 msg_Err( p_this, "list allocation failed!" );
887 ListChildren( p_list, p_this, i_type );
888 vlc_mutex_unlock( &structure_lock );
892 msg_Err( p_this, "unimplemented!" );
893 p_list = NewList( 0 );
901 * Gets the list of children of an objects, and increment their reference
903 * @return a list (possibly empty) or NULL in case of error.
905 vlc_list_t *__vlc_list_children( vlc_object_t *obj )
908 vlc_object_internals_t *priv = vlc_internals( obj );
910 vlc_mutex_lock( &structure_lock );
911 l = NewList( priv->i_children );
912 for (int i = 0; i < l->i_count; i++)
914 vlc_object_yield( priv->pp_children[i] );
915 l->p_values[i].p_object = priv->pp_children[i];
917 vlc_mutex_unlock( &structure_lock );
921 /*****************************************************************************
922 * DumpCommand: print the current vlc structure
923 *****************************************************************************
924 * This function prints either an ASCII tree showing the connections between
925 * vlc objects, and additional information such as their refcount, thread ID,
926 * etc. (command "tree"), or the same data as a simple list (command "list").
927 *****************************************************************************/
928 static int DumpCommand( vlc_object_t *p_this, char const *psz_cmd,
929 vlc_value_t oldval, vlc_value_t newval, void *p_data )
931 libvlc_int_t *p_libvlc = p_this->p_libvlc;
933 (void)oldval; (void)p_data;
934 if( *psz_cmd == 'l' )
936 vlc_object_t *cur = VLC_OBJECT (p_libvlc);
938 vlc_mutex_lock( &structure_lock );
941 PrintObject (cur, "");
942 cur = vlc_internals (cur)->next;
944 while (cur != VLC_OBJECT(p_libvlc));
945 vlc_mutex_unlock( &structure_lock );
949 vlc_object_t *p_object = NULL;
951 if( *newval.psz_string )
954 int i_id = strtol( newval.psz_string, &end, 0 );
956 p_object = vlc_object_get( p_libvlc, i_id );
958 /* try using the object's name to find it */
959 p_object = vlc_object_find_name( p_this, newval.psz_string,
968 vlc_mutex_lock( &structure_lock );
970 if( *psz_cmd == 't' )
972 char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
975 p_object = VLC_OBJECT(p_this->p_libvlc);
978 DumpStructure( p_object, 0, psz_foo );
980 else if( *psz_cmd == 'v' )
985 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
987 PrintObject( p_object, "" );
989 if( !vlc_internals( p_object )->i_vars )
990 printf( " `-o No variables\n" );
991 for( i = 0; i < vlc_internals( p_object )->i_vars; i++ )
993 variable_t *p_var = vlc_internals( p_object )->p_vars + i;
995 const char *psz_type = "unknown";
996 switch( p_var->i_type & VLC_VAR_TYPE )
998 #define MYCASE( type, nice ) \
999 case VLC_VAR_ ## type: \
1002 MYCASE( VOID, "void" );
1003 MYCASE( BOOL, "bool" );
1004 MYCASE( INTEGER, "integer" );
1005 MYCASE( HOTKEY, "hotkey" );
1006 MYCASE( STRING, "string" );
1007 MYCASE( MODULE, "module" );
1008 MYCASE( FILE, "file" );
1009 MYCASE( DIRECTORY, "directory" );
1010 MYCASE( VARIABLE, "variable" );
1011 MYCASE( FLOAT, "float" );
1012 MYCASE( TIME, "time" );
1013 MYCASE( ADDRESS, "address" );
1014 MYCASE( MUTEX, "mutex" );
1015 MYCASE( LIST, "list" );
1018 printf( " %c-o \"%s\" (%s",
1019 i + 1 == vlc_internals( p_object )->i_vars ? '`' : '|',
1020 p_var->psz_name, psz_type );
1021 if( p_var->psz_text )
1022 printf( ", %s", p_var->psz_text );
1024 if( p_var->i_type & VLC_VAR_HASCHOICE )
1025 printf( ", has choices" );
1026 if( p_var->i_type & VLC_VAR_ISCOMMAND )
1027 printf( ", command" );
1028 if( p_var->i_entries )
1029 printf( ", %d callbacks", p_var->i_entries );
1030 switch( p_var->i_type & 0x00f0 )
1036 printf( ": %s", p_var->val.b_bool ? "true" : "false" );
1038 case VLC_VAR_INTEGER:
1039 printf( ": %d", p_var->val.i_int );
1041 case VLC_VAR_STRING:
1042 printf( ": \"%s\"", p_var->val.psz_string );
1045 printf( ": %f", p_var->val.f_float );
1048 printf( ": %"PRIi64, (int64_t)p_var->val.i_time );
1050 case VLC_VAR_ADDRESS:
1051 printf( ": %p", p_var->val.p_address );
1061 vlc_mutex_unlock( &structure_lock );
1063 if( *newval.psz_string )
1065 vlc_object_release( p_object );
1072 /*****************************************************************************
1073 * vlc_list_release: free a list previously allocated by vlc_list_find
1074 *****************************************************************************
1075 * This function decreases the refcount of all objects in the list and
1077 *****************************************************************************/
1078 void vlc_list_release( vlc_list_t *p_list )
1082 for( i_index = 0; i_index < p_list->i_count; i_index++ )
1084 vlc_object_release( p_list->p_values[i_index].p_object );
1087 free( p_list->p_values );
1091 /*****************************************************************************
1092 * dump an object. (Debug function)
1093 *****************************************************************************/
1094 static void vlc_object_dump( vlc_object_t *p_this )
1096 char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
1099 vlc_assert_locked( &structure_lock );
1100 DumpStructure( p_this, 0, psz_foo );
1103 /* Following functions are local */
1105 static vlc_object_t * FindObject( vlc_object_t *p_this, int i_type, int i_mode )
1108 vlc_object_t *p_tmp;
1110 switch( i_mode & 0x000f )
1113 p_tmp = p_this->p_parent;
1116 if( p_tmp->i_object_type == i_type )
1118 vlc_object_yield( p_tmp );
1123 return FindObject( p_tmp, i_type, i_mode );
1129 for( i = vlc_internals( p_this )->i_children; i--; )
1131 p_tmp = vlc_internals( p_this )->pp_children[i];
1132 if( p_tmp->i_object_type == i_type )
1134 vlc_object_yield( p_tmp );
1137 else if( vlc_internals( p_tmp )->i_children )
1139 p_tmp = FindObject( p_tmp, i_type, i_mode );
1149 /* Handled in vlc_object_find */
1156 static vlc_object_t * FindObjectName( vlc_object_t *p_this,
1157 const char *psz_name,
1161 vlc_object_t *p_tmp;
1163 switch( i_mode & 0x000f )
1166 p_tmp = p_this->p_parent;
1169 if( p_tmp->psz_object_name
1170 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1172 vlc_object_yield( p_tmp );
1177 return FindObjectName( p_tmp, psz_name, i_mode );
1183 for( i = vlc_internals( p_this )->i_children; i--; )
1185 p_tmp = vlc_internals( p_this )->pp_children[i];
1186 if( p_tmp->psz_object_name
1187 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1189 vlc_object_yield( p_tmp );
1192 else if( vlc_internals( p_tmp )->i_children )
1194 p_tmp = FindObjectName( p_tmp, psz_name, i_mode );
1204 /* Handled in vlc_object_find */
1212 static void PrintObject( vlc_object_t *p_this, const char *psz_prefix )
1214 char psz_children[20], psz_refcount[20], psz_thread[30], psz_name[50],
1217 int canc = vlc_savecancel ();
1218 memset( &psz_name, 0, sizeof(psz_name) );
1219 if( p_this->psz_object_name )
1221 snprintf( psz_name, 49, " \"%s\"", p_this->psz_object_name );
1223 psz_name[48] = '\"';
1226 psz_children[0] = '\0';
1227 switch( vlc_internals( p_this )->i_children )
1232 strcpy( psz_children, ", 1 child" );
1235 snprintf( psz_children, 19, ", %i children",
1236 vlc_internals( p_this )->i_children );
1240 psz_refcount[0] = '\0';
1241 if( vlc_internals( p_this )->i_refcount > 0 )
1242 snprintf( psz_refcount, 19, ", refcount %u",
1243 vlc_internals( p_this )->i_refcount );
1245 psz_thread[0] = '\0';
1246 if( vlc_internals( p_this )->b_thread )
1247 snprintf( psz_thread, 29, " (thread %lu)",
1248 (unsigned long)vlc_internals( p_this )->thread_id );
1250 psz_parent[0] = '\0';
1251 if( p_this->p_parent )
1252 snprintf( psz_parent, 19, ", parent %i", p_this->p_parent->i_object_id );
1254 printf( " %so %.8i %s%s%s%s%s%s\n", psz_prefix,
1255 p_this->i_object_id, p_this->psz_object_type,
1256 psz_name, psz_thread, psz_refcount, psz_children,
1258 vlc_restorecancel (canc);
1261 static void DumpStructure( vlc_object_t *p_this, int i_level, char *psz_foo )
1264 char i_back = psz_foo[i_level];
1265 psz_foo[i_level] = '\0';
1267 PrintObject( p_this, psz_foo );
1269 psz_foo[i_level] = i_back;
1271 if( i_level / 2 >= MAX_DUMPSTRUCTURE_DEPTH )
1273 msg_Warn( p_this, "structure tree is too deep" );
1277 for( i = 0 ; i < vlc_internals( p_this )->i_children ; i++ )
1281 psz_foo[i_level-1] = ' ';
1283 if( psz_foo[i_level-2] == '`' )
1285 psz_foo[i_level-2] = ' ';
1289 if( i == vlc_internals( p_this )->i_children - 1 )
1291 psz_foo[i_level] = '`';
1295 psz_foo[i_level] = '|';
1298 psz_foo[i_level+1] = '-';
1299 psz_foo[i_level+2] = '\0';
1301 DumpStructure( vlc_internals( p_this )->pp_children[i], i_level + 2,
1306 static vlc_list_t * NewList( int i_count )
1308 vlc_list_t * p_list = (vlc_list_t *)malloc( sizeof( vlc_list_t ) );
1309 if( p_list == NULL )
1314 p_list->i_count = i_count;
1318 p_list->p_values = NULL;
1322 p_list->p_values = malloc( i_count * sizeof( vlc_value_t ) );
1323 if( p_list->p_values == NULL )
1325 p_list->i_count = 0;
1332 static void ListReplace( vlc_list_t *p_list, vlc_object_t *p_object,
1335 if( p_list == NULL || i_index >= p_list->i_count )
1340 vlc_object_yield( p_object );
1342 p_list->p_values[i_index].p_object = p_object;
1347 /*static void ListAppend( vlc_list_t *p_list, vlc_object_t *p_object )
1349 if( p_list == NULL )
1354 p_list->p_values = realloc( p_list->p_values, (p_list->i_count + 1)
1355 * sizeof( vlc_value_t ) );
1356 if( p_list->p_values == NULL )
1358 p_list->i_count = 0;
1362 vlc_object_yield( p_object );
1364 p_list->p_values[p_list->i_count].p_object = p_object;
1370 static int CountChildren( vlc_object_t *p_this, int i_type )
1372 vlc_object_t *p_tmp;
1375 for( i = 0; i < vlc_internals( p_this )->i_children; i++ )
1377 p_tmp = vlc_internals( p_this )->pp_children[i];
1379 if( p_tmp->i_object_type == i_type )
1383 i_count += CountChildren( p_tmp, i_type );
1389 static void ListChildren( vlc_list_t *p_list, vlc_object_t *p_this, int i_type )
1391 vlc_object_t *p_tmp;
1394 for( i = 0; i < vlc_internals( p_this )->i_children; i++ )
1396 p_tmp = vlc_internals( p_this )->pp_children[i];
1398 if( p_tmp->i_object_type == i_type )
1399 ListReplace( p_list, p_tmp, p_list->i_count++ );
1401 ListChildren( p_list, p_tmp, i_type );