git.sesse.net Git - vlc/blob - src/misc/objects.c

   1 /*****************************************************************************
   2  * objects.c: vlc_object_t handling
   3  *****************************************************************************
   4  * Copyright (C) 2004-2007 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   8  *
   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.
  13  *
  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.
  18  *
  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  *****************************************************************************/
  23
  24 /**
  25  * \file
  26  * This file contains the functions to handle the vlc_object_t type
  27  */
  28
  29
  30 /*****************************************************************************
  31  * Preamble
  32  *****************************************************************************/
  33 #ifdef HAVE_CONFIG_H
  34 # include "config.h"
  35 #endif
  36
  37 #include <vlc/vlc.h>
  38
  39 #include "../libvlc.h"
  40 #include <vlc_vout.h>
  41 #include <vlc_aout.h>
  42 #include "audio_output/aout_internal.h"
  43
  44 #include <vlc_access.h>
  45 #include <vlc_demux.h>
  46 #include <vlc_stream.h>
  47
  48 #include <vlc_sout.h>
  49 #include "stream_output/stream_output.h"
  50
  51 #include "vlc_playlist.h"
  52 #include "vlc_interface.h"
  53 #include "vlc_codec.h"
  54 #include "vlc_filter.h"
  55
  56 #include "vlc_httpd.h"
  57 #include "vlc_vlm.h"
  58 #include "input/vlm_internal.h"
  59 #include "vlc_vod.h"
  60 #include "vlc_tls.h"
  61 #include "vlc_xml.h"
  62 #include "vlc_osd.h"
  63 #include "vlc_meta.h"
  64
  65 #include "variables.h"
  66 #ifndef WIN32
  67 # include <unistd.h>
  68 #else
  69 # include <io.h>
  70 # include <fcntl.h>
  71 # include <errno.h> /* ENOSYS */
  72 #endif
  73 #include <assert.h>
  74
  75 /*****************************************************************************
  76  * Local prototypes
  77  *****************************************************************************/
  78 static int  DumpCommand( vlc_object_t *, char const *,
  79                          vlc_value_t, vlc_value_t, void * );
  80
  81 static vlc_object_t * FindObject    ( vlc_object_t *, int, int );
  82 static vlc_object_t * FindObjectName( vlc_object_t *, const char *, int );
  83 static void           DetachObject  ( vlc_object_t * );
  84 static void           PrintObject   ( vlc_object_t *, const char * );
  85 static void           DumpStructure ( vlc_object_t *, int, char * );
  86 static int            FindIndex     ( vlc_object_t *, vlc_object_t **, int );
  87 static void           SetAttachment ( vlc_object_t *, vlc_bool_t );
  88
  89 static vlc_list_t   * NewList       ( int );
  90 static void           ListReplace   ( vlc_list_t *, vlc_object_t *, int );
  91 /*static void           ListAppend    ( vlc_list_t *, vlc_object_t * );*/
  92 static int            CountChildren ( vlc_object_t *, int );
  93 static void           ListChildren  ( vlc_list_t *, vlc_object_t *, int );
  94
  95 /*****************************************************************************
  96  * Local structure lock
  97  *****************************************************************************/
  98 static vlc_mutex_t    structure_lock;
  99 static vlc_object_internals_t global_internals;
 100
 101 vlc_object_t *vlc_custom_create( vlc_object_t *p_this, size_t i_size,
 102                                  int i_type, const char *psz_type )
 103 {
 104     vlc_object_t *p_new;
 105     vlc_object_internals_t *p_priv;
 106
 107     if( i_type == VLC_OBJECT_GLOBAL )
 108     {
 109         p_new = p_this;
 110         p_priv = &global_internals;
 111         memset( p_priv, 0, sizeof( *p_priv ) );
 112     }
 113     else
 114     {
 115         p_priv = calloc( 1, sizeof( *p_priv ) + i_size );
 116         if( p_priv == NULL )
 117             return NULL;
 118
 119         p_new = (vlc_object_t *)(p_priv + 1);
 120     }
 121
 122     p_new->p_internals = p_priv;
 123     p_new->i_object_type = i_type;
 124     p_new->psz_object_type = psz_type;
 125
 126     p_new->psz_object_name = NULL;
 127
 128     p_new->b_die = VLC_FALSE;
 129     p_new->b_error = VLC_FALSE;
 130     p_new->b_dead = VLC_FALSE;
 131     p_priv->b_attached = VLC_FALSE;
 132     p_new->b_force = VLC_FALSE;
 133
 134     p_new->psz_header = NULL;
 135
 136     if( p_this->i_flags & OBJECT_FLAGS_NODBG )
 137         p_new->i_flags |= OBJECT_FLAGS_NODBG;
 138     if( p_this->i_flags & OBJECT_FLAGS_QUIET )
 139         p_new->i_flags |= OBJECT_FLAGS_QUIET;
 140     if( p_this->i_flags & OBJECT_FLAGS_NOINTERACT )
 141         p_new->i_flags |= OBJECT_FLAGS_NOINTERACT;
 142
 143     p_priv->p_vars = calloc( sizeof( variable_t ), 16 );
 144
 145     if( !p_priv->p_vars )
 146     {
 147         if( i_type != VLC_OBJECT_GLOBAL )
 148             free( p_priv );
 149         return NULL;
 150     }
 151
 152     if( i_type == VLC_OBJECT_GLOBAL )
 153     {
 154         /* If i_type is global, then p_new is actually p_libvlc_global */
 155         libvlc_global_data_t *p_libvlc_global = (libvlc_global_data_t *)p_new;
 156         p_new->p_libvlc = NULL;
 157
 158         p_libvlc_global->i_counter = 0;
 159         p_new->i_object_id = 0;
 160
 161         p_libvlc_global->i_objects = 1;
 162         p_libvlc_global->pp_objects = malloc( sizeof(vlc_object_t *) );
 163         p_libvlc_global->pp_objects[0] = p_new;
 164         p_priv->b_attached = VLC_TRUE;
 165     }
 166     else
 167     {
 168         libvlc_global_data_t *p_libvlc_global = vlc_global();
 169         if( i_type == VLC_OBJECT_LIBVLC )
 170         {
 171             p_new->p_libvlc = (libvlc_int_t*)p_new;
 172             p_priv->b_attached = VLC_TRUE;
 173         }
 174         else
 175         {
 176             p_new->p_libvlc = p_this->p_libvlc;
 177         }
 178
 179         vlc_mutex_lock( &structure_lock );
 180
 181         p_libvlc_global->i_counter++;
 182         p_new->i_object_id = p_libvlc_global->i_counter;
 183
 184         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 185          * useless to try and recover anything if pp_objects gets smashed. */
 186         TAB_APPEND( p_libvlc_global->i_objects, p_libvlc_global->pp_objects,
 187                     p_new );
 188
 189         vlc_mutex_unlock( &structure_lock );
 190     }
 191
 192     p_priv->i_refcount = 0;
 193     p_new->p_parent = NULL;
 194     p_new->pp_children = NULL;
 195     p_new->i_children = 0;
 196
 197     p_new->p_private = NULL;
 198
 199     /* Initialize mutexes and condvars */
 200     vlc_mutex_init( p_new, &p_new->object_lock );
 201     vlc_cond_init( p_new, &p_new->object_wait );
 202     vlc_mutex_init( p_new, &p_priv->var_lock );
 203     vlc_spin_init( &p_priv->spin );
 204     p_priv->pipes[0] = p_priv->pipes[1] = -1;
 205
 206     if( i_type == VLC_OBJECT_GLOBAL )
 207     {
 208         vlc_mutex_init( p_new, &structure_lock );
 209     }
 210
 211     if( i_type == VLC_OBJECT_LIBVLC )
 212     {
 213         var_Create( p_new, "list", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 214         var_AddCallback( p_new, "list", DumpCommand, NULL );
 215         var_Create( p_new, "tree", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 216         var_AddCallback( p_new, "tree", DumpCommand, NULL );
 217         var_Create( p_new, "vars", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 218         var_AddCallback( p_new, "vars", DumpCommand, NULL );
 219     }
 220
 221     return p_new;
 222 }
 223
 224
 225 /**
 226  * Allocates and initializes a vlc object.
 227  *
 228  * @param i_type known object type (all of them are negative integer values),
 229  *               or object byte size (always positive).
 230  *
 231  * @return the new object, or NULL on error.
 232  */
 233 void * __vlc_object_create( vlc_object_t *p_this, int i_type )
 234 {
 235     const char   * psz_type;
 236     size_t         i_size;
 237
 238     switch( i_type )
 239     {
 240         case VLC_OBJECT_GLOBAL:
 241             i_size = sizeof(libvlc_global_data_t);
 242             psz_type = "global";
 243             break;
 244         case VLC_OBJECT_LIBVLC:
 245             i_size = sizeof(libvlc_int_t);
 246             psz_type = "libvlc";
 247             break;
 248         case VLC_OBJECT_INTF:
 249             i_size = sizeof(intf_thread_t);
 250             psz_type = "interface";
 251             break;
 252         case VLC_OBJECT_DIALOGS:
 253             i_size = sizeof(intf_thread_t);
 254             psz_type = "dialogs";
 255             break;
 256         case VLC_OBJECT_PLAYLIST:
 257             i_size = sizeof(playlist_t);
 258             psz_type = "playlist";
 259             break;
 260         case VLC_OBJECT_SD:
 261             i_size = sizeof(services_discovery_t);
 262             psz_type = "services discovery";
 263             break;
 264         case VLC_OBJECT_INPUT:
 265             i_size = sizeof(input_thread_t);
 266             psz_type = "input";
 267             break;
 268         case VLC_OBJECT_DEMUX:
 269             i_size = sizeof(demux_t);
 270             psz_type = "demux";
 271             break;
 272         case VLC_OBJECT_ACCESS:
 273             i_size = sizeof(access_t);
 274             psz_type = "access";
 275             break;
 276         case VLC_OBJECT_DECODER:
 277             i_size = sizeof(decoder_t);
 278             psz_type = "decoder";
 279             break;
 280         case VLC_OBJECT_PACKETIZER:
 281             i_size = sizeof(decoder_t);
 282             psz_type = "packetizer";
 283             break;
 284         case VLC_OBJECT_ENCODER:
 285             i_size = sizeof(encoder_t);
 286             psz_type = "encoder";
 287             break;
 288         case VLC_OBJECT_FILTER:
 289             i_size = sizeof(filter_t);
 290             psz_type = "filter";
 291             break;
 292         case VLC_OBJECT_VOUT:
 293             i_size = sizeof(vout_thread_t);
 294             psz_type = "video output";
 295             break;
 296         case VLC_OBJECT_SPU:
 297             i_size = sizeof(spu_t);
 298             psz_type = "subpicture";
 299             break;
 300         case VLC_OBJECT_AOUT:
 301             i_size = sizeof(aout_instance_t);
 302             psz_type = "audio output";
 303             break;
 304         case VLC_OBJECT_SOUT:
 305             i_size = sizeof(sout_instance_t);
 306             psz_type = "stream output";
 307             break;
 308         case VLC_OBJECT_VLM:
 309             i_size = sizeof( vlm_t );
 310             psz_type = "vlm dameon";
 311             break;
 312         case VLC_OBJECT_VOD:
 313             i_size = sizeof( vod_t );
 314             psz_type = "vod server";
 315             break;
 316         case VLC_OBJECT_XML:
 317             i_size = sizeof( xml_t );
 318             psz_type = "xml";
 319             break;
 320         case VLC_OBJECT_OPENGL:
 321             i_size = sizeof( vout_thread_t );
 322             psz_type = "opengl";
 323             break;
 324         case VLC_OBJECT_ANNOUNCE:
 325             i_size = sizeof( announce_handler_t );
 326             psz_type = "announce";
 327             break;
 328         case VLC_OBJECT_META_ENGINE:
 329             i_size = sizeof( meta_engine_t );
 330             psz_type = "meta engine";
 331             break;
 332         case VLC_OBJECT_OSDMENU:
 333             i_size = sizeof( osd_menu_t );
 334             psz_type = "osd menu";
 335             break;
 336         default:
 337             i_size = i_type > (int)sizeof(vlc_object_t)
 338                          ? i_type : (int)sizeof(vlc_object_t);
 339             i_type = VLC_OBJECT_GENERIC;
 340             psz_type = "generic";
 341             break;
 342     }
 343
 344     return vlc_custom_create( p_this, i_size, i_type, psz_type );
 345 }
 346
 347
 348 /**
 349  ****************************************************************************
 350  * Destroy a vlc object
 351  *
 352  * This function destroys an object that has been previously allocated with
 353  * vlc_object_create. The object's refcount must be zero and it must not be
 354  * attached to other objects in any way.
 355  *****************************************************************************/
 356 void __vlc_object_destroy( vlc_object_t *p_this )
 357 {
 358     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 359     int i_delay = 0;
 360
 361     if( p_this->i_children )
 362     {
 363         msg_Err( p_this, "cannot delete object (%i, %s) with children" ,
 364                  p_this->i_object_id, p_this->psz_object_name );
 365         return;
 366     }
 367
 368     if( p_this->p_parent )
 369     {
 370         msg_Err( p_this, "cannot delete object (%i, %s) with a parent",
 371                  p_this->i_object_id, p_this->psz_object_name );
 372         return;
 373     }
 374
 375     while( p_priv->i_refcount > 0 )
 376     {
 377         i_delay++;
 378
 379         /* Don't warn immediately ... 100ms seems OK */
 380         if( i_delay == 2 )
 381         {
 382             msg_Warn( p_this,
 383                   "refcount is %u, delaying before deletion (id=%d,type=%d)",
 384                   p_priv->i_refcount, p_this->i_object_id,
 385                   p_this->i_object_type );
 386         }
 387         else if( i_delay == 10 )
 388         {
 389             msg_Err( p_this,
 390                   "refcount is %u, delaying again (id=%d,type=%d)",
 391                   p_priv->i_refcount, p_this->i_object_id,
 392                   p_this->i_object_type );
 393         }
 394         else if( i_delay == 20 )
 395         {
 396             msg_Err( p_this,
 397                   "waited too long, cancelling destruction (id=%d,type=%d)",
 398                   p_this->i_object_id, p_this->i_object_type );
 399             return;
 400         }
 401
 402         msleep( 100000 );
 403     }
 404
 405     /* Destroy the associated variables, starting from the end so that
 406      * no memmove calls have to be done. */
 407     while( p_priv->i_vars )
 408     {
 409         var_Destroy( p_this, p_priv->p_vars[p_priv->i_vars - 1].psz_name );
 410     }
 411
 412     free( p_priv->p_vars );
 413     vlc_mutex_destroy( &p_priv->var_lock );
 414
 415     if( p_this->psz_header ) free( p_this->psz_header );
 416
 417     if( p_this->i_object_type == VLC_OBJECT_GLOBAL )
 418     {
 419         libvlc_global_data_t *p_global = (libvlc_global_data_t *)p_this;
 420         /* We are the global object ... no need to lock. */
 421         free( p_global->pp_objects );
 422         p_global->pp_objects = NULL;
 423         p_global->i_objects--;
 424
 425         vlc_mutex_destroy( &structure_lock );
 426     }
 427     else
 428     {
 429         libvlc_global_data_t *p_libvlc_global = vlc_global();
 430         int i_index;
 431
 432         vlc_mutex_lock( &structure_lock );
 433
 434         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 435          * useless to try and recover anything if pp_objects gets smashed. */
 436         i_index = FindIndex( p_this, p_libvlc_global->pp_objects,
 437                              p_libvlc_global->i_objects );
 438         REMOVE_ELEM( p_libvlc_global->pp_objects,
 439                      p_libvlc_global->i_objects, i_index );
 440
 441         vlc_mutex_unlock( &structure_lock );
 442     }
 443
 444 #if defined(WIN32) || defined(UNDER_CE)
 445     /* if object has an associated thread, close it now */
 446     if( p_priv->thread_id.hThread )
 447        CloseHandle(p_priv->thread_id.hThread);
 448 #endif
 449
 450     vlc_mutex_destroy( &p_this->object_lock );
 451     vlc_cond_destroy( &p_this->object_wait );
 452     vlc_spin_destroy( &p_priv->spin );
 453     if( p_priv->pipes[0] != -1 )
 454         close( p_priv->pipes[0] );
 455     if( p_priv->pipes[1] != -1 )
 456         close( p_priv->pipes[1] );
 457
 458     /* global is not dynamically allocated by vlc_object_create */
 459     if( p_this->i_object_type != VLC_OBJECT_GLOBAL )
 460         free( p_priv );
 461 }
 462
 463
 464 /** Inter-object signaling */
 465
 466 void __vlc_object_lock( vlc_object_t *obj )
 467 {
 468     vlc_mutex_lock( &obj->object_lock );
 469 }
 470
 471 void __vlc_object_unlock( vlc_object_t *obj )
 472 {
 473     vlc_assert_locked( &obj->object_lock );
 474     vlc_mutex_unlock( &obj->object_lock );
 475 }
 476
 477 #ifdef WIN32
 478 # include <winsock2.h>
 479 # include <ws2tcpip.h>
 480
 481 /**
 482  * select()-able pipes emulated using Winsock
 483  */
 484 static int pipe (int fd[2])
 485 {
 486     SOCKADDR_IN addr;
 487     int addrlen = sizeof (addr);
 488
 489     SOCKET l = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP), a,
 490            c = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
 491     if ((l == INVALID_SOCKET) || (c == INVALID_SOCKET))
 492         goto error;
 493
 494     memset (&addr, 0, sizeof (addr));
 495     addr.sin_family = AF_INET;
 496     addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
 497     if (bind (l, (PSOCKADDR)&addr, sizeof (addr))
 498      || getsockname (l, (PSOCKADDR)&addr, &addrlen)
 499      || listen (l, 1)
 500      || connect (c, (PSOCKADDR)&addr, addrlen))
 501         goto error;
 502
 503     a = accept (l, NULL, NULL);
 504     if (a == INVALID_SOCKET)
 505         goto error;
 506
 507     closesocket (l);
 508     shutdown (a, 0);
 509     shutdown (c, 1);
 510     fd[0] = c;
 511     fd[1] = a;
 512     return 0;
 513
 514 error:
 515     if (l != INVALID_SOCKET)
 516         closesocket (l);
 517     if (c != INVALID_SOCKET)
 518         closesocket (c);
 519     return -1;
 520 }
 521
 522 #undef  read
 523 #define read( a, b, c )  recv (a, b, c, 0)
 524 #undef  write
 525 #define write( a, b, c ) send (a, b, c, 0)
 526 #undef  close
 527 #define close( a )       closesocket (a)
 528 #endif /* WIN32 */
 529
 530 /**
 531  * Returns the readable end of a pipe that becomes readable whenever
 532  * an object is signaled. This can be used to wait for VLC object events
 533  * inside select(), poll() loops or frameworks providing an event loop.
 534  *
 535  * Note that the pipe will remain the same for the lifetime of the object.
 536  * DO NOT close it yourself. Ever.
 537  *
 538  * DO NOT try to read from the pipe either: call vlc_object_wait() instead.
 539  * Assuming the pipe is readable, vlc_object_wait() will not block.
 540  * Also note that, as with vlc_object_wait(), there may be spurious wakeups.
 541  *
 542  * @param obj object that would be signaled
 543  * @return a readable pipe descriptor, or -1 on error.
 544  */
 545 int __vlc_object_waitpipe( vlc_object_t *obj )
 546 {
 547     int pfd[2] = { -1, -1 };
 548     struct vlc_object_internals_t *internals = obj->p_internals;
 549     vlc_bool_t race = VLC_FALSE, signaled = VLC_FALSE;
 550
 551     vlc_spin_lock (&internals->spin);
 552     if (internals->pipes[0] == -1)
 553     {
 554         /* This can only ever happen if someone killed us without locking: */
 555         assert (internals->pipes[1] == -1);
 556         vlc_spin_unlock (&internals->spin);
 557
 558         if (pipe (pfd))
 559             return -1;
 560
 561         vlc_spin_lock (&internals->spin);
 562         signaled = internals->b_signaled;
 563         if (internals->pipes[0] == -1)
 564         {
 565             internals->pipes[0] = pfd[0];
 566             internals->pipes[1] = pfd[1];
 567         }
 568         else
 569             race = VLC_TRUE;
 570     }
 571     vlc_spin_unlock (&internals->spin);
 572
 573     if (race)
 574     {   /* Race condition: two threads call pipe() - unlikely */
 575         close (pfd[0]);
 576         close (pfd[1]);
 577     }
 578
 579     if (signaled)
 580         /* Race condition: lc_object_signal() already invoked! */
 581         while (write (internals->pipes[1], &(char){ 0 }, 1) < 0);
 582
 583     return internals->pipes[0];
 584 }
 585
 586
 587 /**
 588  * Waits for the object to be signaled (using vlc_object_signal()).
 589  * If the object already has a signal pending, this function will return
 590  * immediately. It is asserted that the caller holds the object lock.
 591  *
 592  * @return true if the object is dying and should terminate.
 593  */
 594 vlc_bool_t __vlc_object_wait( vlc_object_t *obj )
 595 {
 596     int fd;
 597
 598     vlc_assert_locked( &obj->object_lock );
 599
 600     fd = obj->p_internals->pipes[0];
 601     if (fd != -1)
 602     {
 603         while (read (fd, &(char){ 0 }, 1)  < 0);
 604         return obj->b_die;
 605     }
 606
 607     vlc_cond_wait( &obj->object_wait, &obj->object_lock );
 608     obj->p_internals->b_signaled = VLC_FALSE;
 609     return obj->b_die;
 610 }
 611
 612
 613 /**
 614  * Waits for the object to be signaled (using vlc_object_signal()), or for
 615  * a timer to expire.
 616  * If the object already has a signal pending, this function will return
 617  * immediately. It is asserted that the caller holds the object lock.
 618  *
 619  * @return negative if the object is dying and should terminate,
 620  * positive if the the object has been signaled but is not dying,
 621  * 0 if timeout has been reached.
 622  */
 623 int __vlc_object_timedwait( vlc_object_t *obj, mtime_t deadline )
 624 {
 625     int v;
 626
 627     vlc_assert_locked( &obj->object_lock );
 628     v = vlc_cond_timedwait( &obj->object_wait, &obj->object_lock, deadline );
 629     if( v == 0 ) /* signaled */
 630         return obj->b_die ? -1 : 1;
 631     return 0;
 632 }
 633
 634
 635 /**
 636  * Checks whether an object has been "killed".
 637  * The object lock must be held.
 638  *
 639  * Typical code for an object thread could be:
 640  *
 641    vlc_object_lock (self);
 642    ...initialization...
 643    while (vlc_object_alive (self))
 644    {
 645        ...preprocessing...
 646
 647        if (vlc_object_wait (self))
 648            continue;
 649
 650        ...postprocessing...
 651    }
 652    ...deinitialization...
 653    vlc_object_unlock (self);
 654  *
 655  *
 656  * @return true iff the object has not been killed yet
 657  */
 658 vlc_bool_t __vlc_object_alive( vlc_object_t *obj )
 659 {
 660     vlc_assert_locked( &obj->object_lock );
 661     return !obj->b_die;
 662 }
 663
 664
 665 /**
 666  * Signals an object for which the lock is held.
 667  */
 668 void __vlc_object_signal_unlocked( vlc_object_t *obj )
 669 {
 670     struct vlc_object_internals_t *internals = obj->p_internals;
 671     int fd;
 672
 673     vlc_assert_locked (&obj->object_lock);
 674
 675     vlc_spin_lock (&internals->spin);
 676     fd = internals->pipes[1];
 677     internals->b_signaled = VLC_TRUE;
 678     vlc_spin_unlock (&internals->spin);
 679
 680     if( fd != -1 )
 681         while( write( fd, &(char){ 0 }, 1 ) < 0 );
 682
 683     vlc_cond_signal( &obj->object_wait );
 684 }
 685
 686
 687 /**
 688  * Requests termination of an object.
 689  * If the object is LibVLC, also request to terminate all its children.
 690  */
 691 void __vlc_object_kill( vlc_object_t *p_this )
 692 {
 693     vlc_mutex_lock( &p_this->object_lock );
 694     p_this->b_die = VLC_TRUE;
 695
 696     if( p_this->i_object_type == VLC_OBJECT_LIBVLC )
 697         for( int i = 0; i < p_this->i_children ; i++ )
 698             vlc_object_kill( p_this->pp_children[i] );
 699
 700     vlc_object_signal_unlocked( p_this );
 701     vlc_mutex_unlock( &p_this->object_lock );
 702 }
 703
 704
 705 /**
 706  * find an object given its ID
 707  *
 708  * This function looks for the object whose i_object_id field is i_id. We
 709  * use a dichotomy so that lookups are in log2(n).
 710  *****************************************************************************/
 711 void * vlc_object_get( int i_id )
 712 {
 713     int i_max, i_middle;
 714     vlc_object_t **pp_objects;
 715     libvlc_global_data_t *p_libvlc_global = vlc_global();
 716
 717     vlc_mutex_lock( &structure_lock );
 718
 719     pp_objects = p_libvlc_global->pp_objects;
 720
 721     /* Perform our dichotomy */
 722     for( i_max = p_libvlc_global->i_objects - 1 ; ; )
 723     {
 724         i_middle = i_max / 2;
 725
 726         if( pp_objects[i_middle]->i_object_id > i_id )
 727         {
 728             i_max = i_middle;
 729         }
 730         else if( pp_objects[i_middle]->i_object_id < i_id )
 731         {
 732             if( i_middle )
 733             {
 734                 pp_objects += i_middle;
 735                 i_max -= i_middle;
 736             }
 737             else
 738             {
 739                 /* This happens when there are only two remaining objects */
 740                 if( pp_objects[i_middle+1]->i_object_id == i_id )
 741                 {
 742                     vlc_mutex_unlock( &structure_lock );
 743                     pp_objects[i_middle+1]->p_internals->i_refcount++;
 744                     return pp_objects[i_middle+1];
 745                 }
 746                 break;
 747             }
 748         }
 749         else
 750         {
 751             vlc_mutex_unlock( &structure_lock );
 752             pp_objects[i_middle]->p_internals->i_refcount++;
 753             return pp_objects[i_middle];
 754         }
 755
 756         if( i_max == 0 )
 757         {
 758             /* this means that i_max == i_middle, and since we have already
 759              * tested pp_objects[i_middle]), p_found is properly set. */
 760             break;
 761         }
 762     }
 763
 764     vlc_mutex_unlock( &structure_lock );
 765     return NULL;
 766 }
 767
 768 /**
 769  ****************************************************************************
 770  * find a typed object and increment its refcount
 771  *****************************************************************************
 772  * This function recursively looks for a given object type. i_mode can be one
 773  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 774  *****************************************************************************/
 775 void * __vlc_object_find( vlc_object_t *p_this, int i_type, int i_mode )
 776 {
 777     vlc_object_t *p_found;
 778
 779     vlc_mutex_lock( &structure_lock );
 780
 781     /* If we are of the requested type ourselves, don't look further */
 782     if( !(i_mode & FIND_STRICT) && p_this->i_object_type == i_type )
 783     {
 784         p_this->p_internals->i_refcount++;
 785         vlc_mutex_unlock( &structure_lock );
 786         return p_this;
 787     }
 788
 789     /* Otherwise, recursively look for the object */
 790     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 791     {
 792         vlc_object_t *p_root = p_this;
 793
 794         /* Find the root */
 795         while( p_root->p_parent != NULL &&
 796                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 797         {
 798             p_root = p_root->p_parent;
 799         }
 800
 801         p_found = FindObject( p_root, i_type, (i_mode & ~0x000f)|FIND_CHILD );
 802         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 803         {
 804             p_found = FindObject( VLC_OBJECT( p_this->p_libvlc ),
 805                                   i_type, (i_mode & ~0x000f)|FIND_CHILD );
 806         }
 807     }
 808     else
 809     {
 810         p_found = FindObject( p_this, i_type, i_mode );
 811     }
 812
 813     vlc_mutex_unlock( &structure_lock );
 814
 815     return p_found;
 816 }
 817
 818 /**
 819  ****************************************************************************
 820  * find a named object and increment its refcount
 821  *****************************************************************************
 822  * This function recursively looks for a given object name. i_mode can be one
 823  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 824  *****************************************************************************/
 825 void * __vlc_object_find_name( vlc_object_t *p_this, const char *psz_name,
 826                                int i_mode )
 827 {
 828     vlc_object_t *p_found;
 829
 830     vlc_mutex_lock( &structure_lock );
 831
 832     /* If have the requested name ourselves, don't look further */
 833     if( !(i_mode & FIND_STRICT)
 834         && p_this->psz_object_name
 835         && !strcmp( p_this->psz_object_name, psz_name ) )
 836     {
 837         p_this->p_internals->i_refcount++;
 838         vlc_mutex_unlock( &structure_lock );
 839         return p_this;
 840     }
 841
 842     /* Otherwise, recursively look for the object */
 843     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 844     {
 845         vlc_object_t *p_root = p_this;
 846
 847         /* Find the root */
 848         while( p_root->p_parent != NULL &&
 849                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 850         {
 851             p_root = p_root->p_parent;
 852         }
 853
 854         p_found = FindObjectName( p_root, psz_name,
 855                                  (i_mode & ~0x000f)|FIND_CHILD );
 856         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 857         {
 858             p_found = FindObjectName( VLC_OBJECT( p_this->p_libvlc ),
 859                                       psz_name, (i_mode & ~0x000f)|FIND_CHILD );
 860         }
 861     }
 862     else
 863     {
 864         p_found = FindObjectName( p_this, psz_name, i_mode );
 865     }
 866
 867     vlc_mutex_unlock( &structure_lock );
 868
 869     return p_found;
 870 }
 871
 872 /**
 873  ****************************************************************************
 874  * increment an object refcount
 875  *****************************************************************************/
 876 void __vlc_object_yield( vlc_object_t *p_this )
 877 {
 878     vlc_mutex_lock( &structure_lock );
 879     p_this->p_internals->i_refcount++;
 880     vlc_mutex_unlock( &structure_lock );
 881 }
 882
 883 static inline void Release( vlc_object_t *obj )
 884 {
 885     assert( obj->p_internals->i_refcount > 0 );
 886     obj->p_internals->i_refcount--;
 887 }
 888
 889 /*****************************************************************************
 890  * decrement an object refcount
 891  *****************************************************************************/
 892 void __vlc_object_release( vlc_object_t *p_this )
 893 {
 894     vlc_mutex_lock( &structure_lock );
 895     Release( p_this );
 896     vlc_mutex_unlock( &structure_lock );
 897 }
 898
 899 /**
 900  ****************************************************************************
 901  * attach object to a parent object
 902  *****************************************************************************
 903  * This function sets p_this as a child of p_parent, and p_parent as a parent
 904  * of p_this. This link can be undone using vlc_object_detach.
 905  *****************************************************************************/
 906 void __vlc_object_attach( vlc_object_t *p_this, vlc_object_t *p_parent )
 907 {
 908     if( !p_this ) return;
 909
 910     vlc_mutex_lock( &structure_lock );
 911
 912     /* Attach the parent to its child */
 913     p_this->p_parent = p_parent;
 914
 915     /* Attach the child to its parent */
 916     INSERT_ELEM( p_parent->pp_children, p_parent->i_children,
 917                  p_parent->i_children, p_this );
 918
 919     /* Climb up the tree to see whether we are connected with the root */
 920     if( p_parent->p_internals->b_attached )
 921     {
 922         SetAttachment( p_this, VLC_TRUE );
 923     }
 924
 925     vlc_mutex_unlock( &structure_lock );
 926 }
 927
 928 /**
 929  ****************************************************************************
 930  * detach object from its parent
 931  *****************************************************************************
 932  * This function removes all links between an object and its parent.
 933  *****************************************************************************/
 934 void __vlc_object_detach( vlc_object_t *p_this )
 935 {
 936     if( !p_this ) return;
 937
 938     vlc_mutex_lock( &structure_lock );
 939     if( !p_this->p_parent )
 940     {
 941         msg_Err( p_this, "object is not attached" );
 942         vlc_mutex_unlock( &structure_lock );
 943         return;
 944     }
 945
 946     /* Climb up the tree to see whether we are connected with the root */
 947     if( p_this->p_parent->p_internals->b_attached )
 948     {
 949         SetAttachment( p_this, VLC_FALSE );
 950     }
 951
 952     DetachObject( p_this );
 953     vlc_mutex_unlock( &structure_lock );
 954     p_this = NULL;
 955 }
 956
 957 /**
 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 )
 965 {
 966     vlc_list_t *p_list;
 967     vlc_object_t **pp_current, **pp_end;
 968     int i_count = 0, i_index = 0;
 969     libvlc_global_data_t *p_libvlc_global = vlc_global();
 970
 971     vlc_mutex_lock( &structure_lock );
 972
 973     /* Look for the objects */
 974     switch( i_mode & 0x000f )
 975     {
 976     case FIND_ANYWHERE:
 977         pp_current = p_libvlc_global->pp_objects;
 978         pp_end = pp_current + p_libvlc_global->i_objects;
 979
 980         for( ; pp_current < pp_end ; pp_current++ )
 981         {
 982             if( (*pp_current)->p_internals->b_attached
 983                  && (*pp_current)->i_object_type == i_type )
 984             {
 985                 i_count++;
 986             }
 987         }
 988
 989         p_list = NewList( i_count );
 990         pp_current = p_libvlc_global->pp_objects;
 991
 992         for( ; pp_current < pp_end ; pp_current++ )
 993         {
 994             if( (*pp_current)->p_internals->b_attached
 995                  && (*pp_current)->i_object_type == i_type )
 996             {
 997                 ListReplace( p_list, *pp_current, i_index );
 998                 if( i_index < i_count ) i_index++;
 999             }
1000         }
1001     break;
1002
1003     case FIND_CHILD:
1004         i_count = CountChildren( p_this, i_type );
1005         p_list = NewList( i_count );
1006
1007         /* Check allocation was successful */
1008         if( p_list->i_count != i_count )
1009         {
1010             msg_Err( p_this, "list allocation failed!" );
1011             p_list->i_count = 0;
1012             break;
1013         }
1014
1015         p_list->i_count = 0;
1016         ListChildren( p_list, p_this, i_type );
1017         break;
1018
1019     default:
1020         msg_Err( p_this, "unimplemented!" );
1021         p_list = NewList( 0 );
1022         break;
1023     }
1024
1025     vlc_mutex_unlock( &structure_lock );
1026
1027     return p_list;
1028 }
1029
1030 /*****************************************************************************
1031  * DumpCommand: print the current vlc structure
1032  *****************************************************************************
1033  * This function prints either an ASCII tree showing the connections between
1034  * vlc objects, and additional information such as their refcount, thread ID,
1035  * etc. (command "tree"), or the same data as a simple list (command "list").
1036  *****************************************************************************/
1037 static int DumpCommand( vlc_object_t *p_this, char const *psz_cmd,
1038                         vlc_value_t oldval, vlc_value_t newval, void *p_data )
1039 {
1040     libvlc_global_data_t *p_libvlc_global = vlc_global();
1041
1042     (void)oldval; (void)p_data;
1043     if( *psz_cmd == 'l' )
1044     {
1045         vlc_mutex_lock( &structure_lock );
1046
1047         vlc_object_t **pp_current, **pp_end;
1048
1049         pp_current = p_libvlc_global->pp_objects;
1050         pp_end = pp_current + p_libvlc_global->i_objects;
1051
1052         for( ; pp_current < pp_end ; pp_current++ )
1053         {
1054             if( (*pp_current)->p_internals->b_attached )
1055             {
1056                 PrintObject( *pp_current, "" );
1057             }
1058             else
1059             {
1060                 printf( " o %.8i %s (not attached)\n",
1061                         (*pp_current)->i_object_id,
1062                         (*pp_current)->psz_object_type );
1063             }
1064         }
1065
1066         vlc_mutex_unlock( &structure_lock );
1067     }
1068     else
1069     {
1070         vlc_object_t *p_object = NULL;
1071
1072         if( *newval.psz_string )
1073         {
1074             char *end;
1075             int i_id = strtol( newval.psz_string, &end, 0 );
1076             if( end != newval.psz_string )
1077                 p_object = vlc_object_get( i_id );
1078             else
1079             {
1080                 /* try using the object's name to find it */
1081                 vlc_object_t *p_libvlc = vlc_object_get( 1 );
1082                 if( p_libvlc )
1083                 {
1084                     /* Look in p_libvlc's children tree */
1085                     p_object = vlc_object_find_name( p_libvlc,
1086                                                      newval.psz_string,
1087                                                      FIND_CHILD );
1088                     vlc_object_release( p_libvlc );
1089                 }
1090                 if( !p_object )
1091                 {
1092                     /* If it's not in libvlc, look in libvlc_global (== p_this) */
1093                     p_object = vlc_object_find_name( p_this,
1094                                                      newval.psz_string,
1095                                                      FIND_CHILD );
1096                 }
1097             }
1098
1099             if( !p_object )
1100             {
1101                 return VLC_ENOOBJ;
1102             }
1103         }
1104
1105         vlc_mutex_lock( &structure_lock );
1106
1107         if( *psz_cmd == 't' )
1108         {
1109             char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
1110
1111             if( !p_object )
1112                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1113
1114             psz_foo[0] = '|';
1115             DumpStructure( p_object, 0, psz_foo );
1116         }
1117         else if( *psz_cmd == 'v' )
1118         {
1119             int i;
1120
1121             if( !p_object )
1122                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1123
1124             PrintObject( p_object, "" );
1125
1126             if( !p_object->p_internals->i_vars )
1127                 printf( " `-o No variables\n" );
1128             for( i = 0; i < p_object->p_internals->i_vars; i++ )
1129             {
1130                 variable_t *p_var = p_object->p_internals->p_vars + i;
1131
1132                 const char *psz_type = "unknown";
1133                 switch( p_var->i_type & VLC_VAR_TYPE )
1134                 {
1135 #define MYCASE( type, nice )                \
1136                     case VLC_VAR_ ## type:  \
1137                         psz_type = nice;    \
1138                         break;
1139                     MYCASE( VOID, "void" );
1140                     MYCASE( BOOL, "bool" );
1141                     MYCASE( INTEGER, "integer" );
1142                     MYCASE( HOTKEY, "hotkey" );
1143                     MYCASE( STRING, "string" );
1144                     MYCASE( MODULE, "module" );
1145                     MYCASE( FILE, "file" );
1146                     MYCASE( DIRECTORY, "directory" );
1147                     MYCASE( VARIABLE, "variable" );
1148                     MYCASE( FLOAT, "float" );
1149                     MYCASE( TIME, "time" );
1150                     MYCASE( ADDRESS, "address" );
1151                     MYCASE( MUTEX, "mutex" );
1152                     MYCASE( LIST, "list" );
1153 #undef MYCASE
1154                 }
1155                 printf( " %c-o \"%s\" (%s",
1156                         i + 1 == p_object->p_internals->i_vars ? '`' : '|',
1157                         p_var->psz_name, psz_type );
1158                 if( p_var->psz_text )
1159                     printf( ", %s", p_var->psz_text );
1160                 printf( ")" );
1161                 if( p_var->i_type & VLC_VAR_ISCOMMAND )
1162                     printf( ", command" );
1163                 if( p_var->i_entries )
1164                     printf( ", %d callbacks", p_var->i_entries );
1165                 switch( p_var->i_type & 0x00f0 )
1166                 {
1167                     case VLC_VAR_VOID:
1168                     case VLC_VAR_MUTEX:
1169                         break;
1170                     case VLC_VAR_BOOL:
1171                         printf( ": %s", p_var->val.b_bool ? "true" : "false" );
1172                         break;
1173                     case VLC_VAR_INTEGER:
1174                         printf( ": %d", p_var->val.i_int );
1175                         break;
1176                     case VLC_VAR_STRING:
1177                         printf( ": \"%s\"", p_var->val.psz_string );
1178                         break;
1179                     case VLC_VAR_FLOAT:
1180                         printf( ": %f", p_var->val.f_float );
1181                         break;
1182                     case VLC_VAR_TIME:
1183                         printf( ": " I64Fi, (int64_t)p_var->val.i_time );
1184                         break;
1185                     case VLC_VAR_ADDRESS:
1186                         printf( ": %p", p_var->val.p_address );
1187                         break;
1188                     case VLC_VAR_LIST:
1189                         printf( ": TODO" );
1190                         break;
1191                 }
1192                 printf( "\n" );
1193             }
1194         }
1195
1196         vlc_mutex_unlock( &structure_lock );
1197
1198         if( *newval.psz_string )
1199         {
1200             vlc_object_release( p_object );
1201         }
1202     }
1203
1204     return VLC_SUCCESS;
1205 }
1206
1207 /*****************************************************************************
1208  * vlc_list_release: free a list previously allocated by vlc_list_find
1209  *****************************************************************************
1210  * This function decreases the refcount of all objects in the list and
1211  * frees the list.
1212  *****************************************************************************/
1213 void vlc_list_release( vlc_list_t *p_list )
1214 {
1215     int i_index;
1216
1217     vlc_mutex_lock( &structure_lock );
1218     for( i_index = 0; i_index < p_list->i_count; i_index++ )
1219     {
1220         Release( p_list->p_values[i_index].p_object );
1221     }
1222     vlc_mutex_unlock( &structure_lock );
1223
1224     free( p_list->p_values );
1225     free( p_list );
1226 }
1227
1228 /* Following functions are local */
1229
1230 /*****************************************************************************
1231  * FindIndex: find the index of an object in an array of objects
1232  *****************************************************************************
1233  * This function assumes that p_this can be found in pp_objects. It will not
1234  * crash if p_this cannot be found, but will return a wrong value. It is your
1235  * duty to check the return value if you are not certain that the object could
1236  * be found for sure.
1237  *****************************************************************************/
1238 static int FindIndex( vlc_object_t *p_this,
1239                       vlc_object_t **pp_objects, int i_count )
1240 {
1241     int i_middle = i_count / 2;
1242
1243     if( i_count == 0 )
1244     {
1245         return 0;
1246     }
1247
1248     if( pp_objects[i_middle] == p_this )
1249     {
1250         return i_middle;
1251     }
1252
1253     if( i_count == 1 )
1254     {
1255         return 0;
1256     }
1257
1258     /* We take advantage of the sorted array */
1259     if( pp_objects[i_middle]->i_object_id < p_this->i_object_id )
1260     {
1261         return i_middle + FindIndex( p_this, pp_objects + i_middle,
1262                                              i_count - i_middle );
1263     }
1264     else
1265     {
1266         return FindIndex( p_this, pp_objects, i_middle );
1267     }
1268 }
1269
1270 static vlc_object_t * FindObject( vlc_object_t *p_this, int i_type, int i_mode )
1271 {
1272     int i;
1273     vlc_object_t *p_tmp;
1274
1275     switch( i_mode & 0x000f )
1276     {
1277     case FIND_PARENT:
1278         p_tmp = p_this->p_parent;
1279         if( p_tmp )
1280         {
1281             if( p_tmp->i_object_type == i_type )
1282             {
1283                 p_tmp->p_internals->i_refcount++;
1284                 return p_tmp;
1285             }
1286             else
1287             {
1288                 return FindObject( p_tmp, i_type, i_mode );
1289             }
1290         }
1291         break;
1292
1293     case FIND_CHILD:
1294         for( i = p_this->i_children; i--; )
1295         {
1296             p_tmp = p_this->pp_children[i];
1297             if( p_tmp->i_object_type == i_type )
1298             {
1299                 p_tmp->p_internals->i_refcount++;
1300                 return p_tmp;
1301             }
1302             else if( p_tmp->i_children )
1303             {
1304                 p_tmp = FindObject( p_tmp, i_type, i_mode );
1305                 if( p_tmp )
1306                 {
1307                     return p_tmp;
1308                 }
1309             }
1310         }
1311         break;
1312
1313     case FIND_ANYWHERE:
1314         /* Handled in vlc_object_find */
1315         break;
1316     }
1317
1318     return NULL;
1319 }
1320
1321 static vlc_object_t * FindObjectName( vlc_object_t *p_this,
1322                                       const char *psz_name,
1323                                       int i_mode )
1324 {
1325     int i;
1326     vlc_object_t *p_tmp;
1327
1328     switch( i_mode & 0x000f )
1329     {
1330     case FIND_PARENT:
1331         p_tmp = p_this->p_parent;
1332         if( p_tmp )
1333         {
1334             if( p_tmp->psz_object_name
1335                 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1336             {
1337                 p_tmp->p_internals->i_refcount++;
1338                 return p_tmp;
1339             }
1340             else
1341             {
1342                 return FindObjectName( p_tmp, psz_name, i_mode );
1343             }
1344         }
1345         break;
1346
1347     case FIND_CHILD:
1348         for( i = p_this->i_children; i--; )
1349         {
1350             p_tmp = p_this->pp_children[i];
1351             if( p_tmp->psz_object_name
1352                 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1353             {
1354                 p_tmp->p_internals->i_refcount++;
1355                 return p_tmp;
1356             }
1357             else if( p_tmp->i_children )
1358             {
1359                 p_tmp = FindObjectName( p_tmp, psz_name, i_mode );
1360                 if( p_tmp )
1361                 {
1362                     return p_tmp;
1363                 }
1364             }
1365         }
1366         break;
1367
1368     case FIND_ANYWHERE:
1369         /* Handled in vlc_object_find */
1370         break;
1371     }
1372
1373     return NULL;
1374 }
1375
1376 static void DetachObject( vlc_object_t *p_this )
1377 {
1378     vlc_object_t *p_parent = p_this->p_parent;
1379     int i_index, i;
1380
1381     /* Remove p_this's parent */
1382     p_this->p_parent = NULL;
1383
1384     /* Remove all of p_parent's children which are p_this */
1385     for( i_index = p_parent->i_children ; i_index-- ; )
1386     {
1387         if( p_parent->pp_children[i_index] == p_this )
1388         {
1389             p_parent->i_children--;
1390             for( i = i_index ; i < p_parent->i_children ; i++ )
1391             {
1392                 p_parent->pp_children[i] = p_parent->pp_children[i+1];
1393             }
1394         }
1395     }
1396
1397     if( p_parent->i_children )
1398     {
1399         p_parent->pp_children = (vlc_object_t **)realloc( p_parent->pp_children,
1400                                p_parent->i_children * sizeof(vlc_object_t *) );
1401     }
1402     else
1403     {
1404         free( p_parent->pp_children );
1405         p_parent->pp_children = NULL;
1406     }
1407 }
1408
1409 /*****************************************************************************
1410  * SetAttachment: recursively set the b_attached flag of a subtree.
1411  *****************************************************************************
1412  * This function is used by the attach and detach functions to propagate
1413  * the b_attached flag in a subtree.
1414  *****************************************************************************/
1415 static void SetAttachment( vlc_object_t *p_this, vlc_bool_t b_attached )
1416 {
1417     int i_index;
1418
1419     for( i_index = p_this->i_children ; i_index-- ; )
1420     {
1421         SetAttachment( p_this->pp_children[i_index], b_attached );
1422     }
1423
1424     p_this->p_internals->b_attached = b_attached;
1425 }
1426
1427 static void PrintObject( vlc_object_t *p_this, const char *psz_prefix )
1428 {
1429     char psz_children[20], psz_refcount[20], psz_thread[30], psz_name[50],
1430          psz_parent[20];
1431
1432     psz_name[0] = '\0';
1433     if( p_this->psz_object_name )
1434     {
1435         snprintf( psz_name, 49, " \"%s\"", p_this->psz_object_name );
1436         if( psz_name[48] )
1437             psz_name[48] = '\"';
1438     }
1439
1440     psz_children[0] = '\0';
1441     switch( p_this->i_children )
1442     {
1443         case 0:
1444             break;
1445         case 1:
1446             strcpy( psz_children, ", 1 child" );
1447             break;
1448         default:
1449             snprintf( psz_children, 19, ", %i children", p_this->i_children );
1450             break;
1451     }
1452
1453     psz_refcount[0] = '\0';
1454     if( p_this->p_internals->i_refcount > 0 )
1455         snprintf( psz_refcount, 19, ", refcount %u",
1456                   p_this->p_internals->i_refcount );
1457
1458     psz_thread[0] = '\0';
1459     if( p_this->p_internals->b_thread )
1460         snprintf( psz_thread, 29, " (thread %u)",
1461 #if defined(WIN32) || defined(UNDER_CE)
1462                   (unsigned)p_this->p_internals->thread_id.id );
1463 #else
1464                   (unsigned)p_this->p_internals->thread_id );
1465 #endif
1466
1467     psz_parent[0] = '\0';
1468     if( p_this->p_parent )
1469         snprintf( psz_parent, 19, ", parent %i", p_this->p_parent->i_object_id );
1470
1471     printf( " %so %.8i %s%s%s%s%s%s\n", psz_prefix,
1472             p_this->i_object_id, p_this->psz_object_type,
1473             psz_name, psz_thread, psz_refcount, psz_children,
1474             psz_parent );
1475 }
1476
1477 static void DumpStructure( vlc_object_t *p_this, int i_level, char *psz_foo )
1478 {
1479     int i;
1480     char i_back = psz_foo[i_level];
1481     psz_foo[i_level] = '\0';
1482
1483     PrintObject( p_this, psz_foo );
1484
1485     psz_foo[i_level] = i_back;
1486
1487     if( i_level / 2 >= MAX_DUMPSTRUCTURE_DEPTH )
1488     {
1489         msg_Warn( p_this, "structure tree is too deep" );
1490         return;
1491     }
1492
1493     for( i = 0 ; i < p_this->i_children ; i++ )
1494     {
1495         if( i_level )
1496         {
1497             psz_foo[i_level-1] = ' ';
1498
1499             if( psz_foo[i_level-2] == '`' )
1500             {
1501                 psz_foo[i_level-2] = ' ';
1502             }
1503         }
1504
1505         if( i == p_this->i_children - 1 )
1506         {
1507             psz_foo[i_level] = '`';
1508         }
1509         else
1510         {
1511             psz_foo[i_level] = '|';
1512         }
1513
1514         psz_foo[i_level+1] = '-';
1515         psz_foo[i_level+2] = '\0';
1516
1517         DumpStructure( p_this->pp_children[i], i_level + 2, psz_foo );
1518     }
1519 }
1520
1521 static vlc_list_t * NewList( int i_count )
1522 {
1523     vlc_list_t * p_list = (vlc_list_t *)malloc( sizeof( vlc_list_t ) );
1524     if( p_list == NULL )
1525     {
1526         return NULL;
1527     }
1528
1529     p_list->i_count = i_count;
1530
1531     if( i_count == 0 )
1532     {
1533         p_list->p_values = NULL;
1534         return p_list;
1535     }
1536
1537     p_list->p_values = malloc( i_count * sizeof( vlc_value_t ) );
1538     if( p_list->p_values == NULL )
1539     {
1540         p_list->i_count = 0;
1541         return p_list;
1542     }
1543
1544     return p_list;
1545 }
1546
1547 static void ListReplace( vlc_list_t *p_list, vlc_object_t *p_object,
1548                          int i_index )
1549 {
1550     if( p_list == NULL || i_index >= p_list->i_count )
1551     {
1552         return;
1553     }
1554
1555     p_object->p_internals->i_refcount++;
1556
1557     p_list->p_values[i_index].p_object = p_object;
1558
1559     return;
1560 }
1561
1562 /*static void ListAppend( vlc_list_t *p_list, vlc_object_t *p_object )
1563 {
1564     if( p_list == NULL )
1565     {
1566         return;
1567     }
1568
1569     p_list->p_values = realloc( p_list->p_values, (p_list->i_count + 1)
1570                                 * sizeof( vlc_value_t ) );
1571     if( p_list->p_values == NULL )
1572     {
1573         p_list->i_count = 0;
1574         return;
1575     }
1576
1577     p_object->p_internals->i_refcount++;
1578
1579     p_list->p_values[p_list->i_count].p_object = p_object;
1580     p_list->i_count++;
1581
1582     return;
1583 }*/
1584
1585 static int CountChildren( vlc_object_t *p_this, int i_type )
1586 {
1587     vlc_object_t *p_tmp;
1588     int i, i_count = 0;
1589
1590     for( i = 0; i < p_this->i_children; i++ )
1591     {
1592         p_tmp = p_this->pp_children[i];
1593
1594         if( p_tmp->i_object_type == i_type )
1595         {
1596             i_count++;
1597         }
1598
1599         if( p_tmp->i_children )
1600         {
1601             i_count += CountChildren( p_tmp, i_type );
1602         }
1603     }
1604
1605     return i_count;
1606 }
1607
1608 static void ListChildren( vlc_list_t *p_list, vlc_object_t *p_this, int i_type )
1609 {
1610     vlc_object_t *p_tmp;
1611     int i;
1612
1613     for( i = 0; i < p_this->i_children; i++ )
1614     {
1615         p_tmp = p_this->pp_children[i];
1616
1617         if( p_tmp->i_object_type == i_type )
1618         {
1619             ListReplace( p_list, p_tmp, p_list->i_count++ );
1620         }
1621
1622         if( p_tmp->i_children )
1623         {
1624             ListChildren( p_list, p_tmp, i_type );
1625         }
1626     }
1627 }