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

   1 /*****************************************************************************
   2  * objects.c: vlc_object_t handling
   3  *****************************************************************************
   4  * Copyright (C) 2004-2008 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_interface.h"
  52 #include "vlc_codec.h"
  53 #include "vlc_filter.h"
  54
  55 #include "variables.h"
  56 #ifndef WIN32
  57 # include <unistd.h>
  58 #else
  59 # include <io.h>
  60 # include <fcntl.h>
  61 # include <errno.h> /* ENOSYS */
  62 #endif
  63 #include <assert.h>
  64
  65 /*****************************************************************************
  66  * Local prototypes
  67  *****************************************************************************/
  68 static int  DumpCommand( vlc_object_t *, char const *,
  69                          vlc_value_t, vlc_value_t, void * );
  70
  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           DetachObject  ( vlc_object_t * );
  74 static void           PrintObject   ( vlc_object_t *, const char * );
  75 static void           DumpStructure ( vlc_object_t *, int, char * );
  76 static int            FindIndex     ( vlc_object_t *, vlc_object_t **, int );
  77 static void           SetAttachment ( vlc_object_t *, bool );
  78
  79 static vlc_list_t   * NewList       ( int );
  80 static void           ListReplace   ( vlc_list_t *, vlc_object_t *, int );
  81 /*static void           ListAppend    ( vlc_list_t *, vlc_object_t * );*/
  82 static int            CountChildren ( vlc_object_t *, int );
  83 static void           ListChildren  ( vlc_list_t *, vlc_object_t *, int );
  84
  85 static void vlc_object_destroy( vlc_object_t *p_this );
  86 static void vlc_object_detach_unlocked (vlc_object_t *p_this);
  87
  88 /*****************************************************************************
  89  * Local structure lock
  90  *****************************************************************************/
  91 static vlc_mutex_t    structure_lock;
  92
  93 void *vlc_custom_create( vlc_object_t *p_this, size_t i_size,
  94                          int i_type, const char *psz_type )
  95 {
  96     vlc_object_t *p_new;
  97     vlc_object_internals_t *p_priv;
  98
  99     /* NOTE:
 100      * VLC objects are laid out as follow:
 101      * - first the LibVLC-private per-object data,
 102      * - then VLC_COMMON members from vlc_object_t,
 103      * - finally, the type-specific data (if any).
 104      *
 105      * This function initializes the LibVLC and common data,
 106      * and zeroes the rest.
 107      */
 108     p_priv = calloc( 1, sizeof( *p_priv ) + i_size );
 109     if( p_priv == NULL )
 110         return NULL;
 111
 112     assert (i_size >= sizeof (vlc_object_t));
 113     p_new = (vlc_object_t *)(p_priv + 1);
 114
 115     p_new->i_object_type = i_type;
 116     p_new->psz_object_type = psz_type;
 117     p_new->psz_object_name = NULL;
 118
 119     p_new->b_die = false;
 120     p_new->b_error = false;
 121     p_new->b_dead = false;
 122     p_priv->b_attached = false;
 123     p_new->b_force = false;
 124
 125     p_new->psz_header = NULL;
 126
 127     if (p_this)
 128         p_new->i_flags = p_this->i_flags
 129             & (OBJECT_FLAGS_NODBG|OBJECT_FLAGS_QUIET|OBJECT_FLAGS_NOINTERACT);
 130
 131     p_priv->p_vars = calloc( sizeof( variable_t ), 16 );
 132
 133     if( !p_priv->p_vars )
 134     {
 135         free( p_priv );
 136         return NULL;
 137     }
 138
 139     libvlc_global_data_t *p_libvlc_global;
 140     if( p_this == NULL )
 141     {
 142         /* Only the global root object is created out of the blue */
 143         p_libvlc_global = (libvlc_global_data_t *)p_new;
 144         p_new->p_libvlc = NULL;
 145
 146         p_libvlc_global->i_counter = 0;
 147         p_libvlc_global->i_objects = 0;
 148         p_libvlc_global->pp_objects = NULL;
 149         p_priv->b_attached = true;
 150         vlc_mutex_init( &structure_lock );
 151     }
 152     else
 153     {
 154         p_libvlc_global = vlc_global();
 155         if( i_type == VLC_OBJECT_LIBVLC )
 156         {
 157             p_new->p_libvlc = (libvlc_int_t*)p_new;
 158             p_priv->b_attached = true;
 159         }
 160         else
 161         {
 162             p_new->p_libvlc = p_this->p_libvlc;
 163         }
 164     }
 165
 166     vlc_spin_init( &p_priv->ref_spin );
 167     p_priv->i_refcount = 1;
 168     p_priv->pf_destructor = NULL;
 169     p_priv->b_thread = false;
 170     p_new->p_parent = NULL;
 171     p_new->pp_children = NULL;
 172     p_new->i_children = 0;
 173
 174     p_new->p_private = NULL;
 175
 176     /* Initialize mutexes and condvars */
 177     vlc_mutex_init( &p_new->object_lock );
 178     vlc_cond_init( p_new, &p_new->object_wait );
 179     vlc_mutex_init( &p_priv->var_lock );
 180     vlc_spin_init( &p_priv->spin );
 181     p_priv->pipes[0] = p_priv->pipes[1] = -1;
 182
 183     vlc_mutex_lock( &structure_lock );
 184     p_new->i_object_id = p_libvlc_global->i_counter++;
 185     /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 186      * useless to try and recover anything if pp_objects gets smashed. */
 187     TAB_APPEND( p_libvlc_global->i_objects, p_libvlc_global->pp_objects,
 188                 p_new );
 189     vlc_mutex_unlock( &structure_lock );
 190
 191     if( i_type == VLC_OBJECT_LIBVLC )
 192     {
 193         var_Create( p_new, "list", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 194         var_AddCallback( p_new, "list", DumpCommand, NULL );
 195         var_Create( p_new, "tree", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 196         var_AddCallback( p_new, "tree", DumpCommand, NULL );
 197         var_Create( p_new, "vars", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 198         var_AddCallback( p_new, "vars", DumpCommand, NULL );
 199     }
 200
 201     return p_new;
 202 }
 203
 204
 205 /**
 206  * Allocates and initializes a vlc object.
 207  *
 208  * @param i_type known object type (all of them are negative integer values),
 209  *               or object byte size (always positive).
 210  *
 211  * @return the new object, or NULL on error.
 212  */
 213 void * __vlc_object_create( vlc_object_t *p_this, int i_type )
 214 {
 215     const char   * psz_type;
 216     size_t         i_size;
 217
 218     switch( i_type )
 219     {
 220         case VLC_OBJECT_LIBVLC:
 221             i_size = sizeof(libvlc_int_t);
 222             psz_type = "libvlc";
 223             break;
 224         case VLC_OBJECT_INTF:
 225             i_size = sizeof(intf_thread_t);
 226             psz_type = "interface";
 227             break;
 228         case VLC_OBJECT_DIALOGS:
 229             i_size = sizeof(intf_thread_t);
 230             psz_type = "dialogs";
 231             break;
 232         case VLC_OBJECT_DEMUX:
 233             i_size = sizeof(demux_t);
 234             psz_type = "demux";
 235             break;
 236         case VLC_OBJECT_ACCESS:
 237             i_size = sizeof(access_t);
 238             psz_type = "access";
 239             break;
 240         case VLC_OBJECT_DECODER:
 241             i_size = sizeof(decoder_t);
 242             psz_type = "decoder";
 243             break;
 244         case VLC_OBJECT_PACKETIZER:
 245             i_size = sizeof(decoder_t);
 246             psz_type = "packetizer";
 247             break;
 248         case VLC_OBJECT_ENCODER:
 249             i_size = sizeof(encoder_t);
 250             psz_type = "encoder";
 251             break;
 252         case VLC_OBJECT_FILTER:
 253             i_size = sizeof(filter_t);
 254             psz_type = "filter";
 255             break;
 256         case VLC_OBJECT_VOUT:
 257             i_size = sizeof(vout_thread_t);
 258             psz_type = "video output";
 259             break;
 260         case VLC_OBJECT_AOUT:
 261             i_size = sizeof(aout_instance_t);
 262             psz_type = "audio output";
 263             break;
 264         case VLC_OBJECT_SOUT:
 265             i_size = sizeof(sout_instance_t);
 266             psz_type = "stream output";
 267             break;
 268         case VLC_OBJECT_OPENGL:
 269             i_size = sizeof( vout_thread_t );
 270             psz_type = "opengl";
 271             break;
 272         case VLC_OBJECT_ANNOUNCE:
 273             i_size = sizeof( announce_handler_t );
 274             psz_type = "announce";
 275             break;
 276         case VLC_OBJECT_INTERACTION:
 277             i_size = sizeof( interaction_t );
 278             psz_type = "interaction";
 279             break;
 280         default:
 281             i_size = i_type > (int)sizeof(vlc_object_t)
 282                          ? i_type : (int)sizeof(vlc_object_t);
 283             i_type = VLC_OBJECT_GENERIC;
 284             psz_type = "generic";
 285             break;
 286     }
 287
 288     return vlc_custom_create( p_this, i_size, i_type, psz_type );
 289 }
 290
 291
 292 /**
 293  ****************************************************************************
 294  * Set the destructor of a vlc object
 295  *
 296  * This function sets the destructor of the vlc object. It will be called
 297  * when the object is destroyed when the its refcount reaches 0.
 298  * (It is called by the internal function vlc_object_destroy())
 299  *****************************************************************************/
 300 void __vlc_object_set_destructor( vlc_object_t *p_this,
 301                                   vlc_destructor_t pf_destructor )
 302 {
 303     vlc_object_internals_t *p_priv = vlc_internals(p_this );
 304     p_priv->pf_destructor = pf_destructor;
 305 }
 306
 307 /**
 308  ****************************************************************************
 309  * Destroy a vlc object (Internal)
 310  *
 311  * This function destroys an object that has been previously allocated with
 312  * vlc_object_create. The object's refcount must be zero and it must not be
 313  * attached to other objects in any way.
 314  *****************************************************************************/
 315 static void vlc_object_destroy( vlc_object_t *p_this )
 316 {
 317     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 318
 319     /* Objects are always detached beforehand */
 320     assert( !p_this->p_parent );
 321
 322     /* Send a kill to the object's thread if applicable */
 323     vlc_object_kill( p_this );
 324
 325     /* If we are running on a thread, wait until it ends */
 326     if( p_priv->b_thread )
 327         vlc_thread_join( p_this );
 328
 329     /* Call the custom "subclass" destructor */
 330     if( p_priv->pf_destructor )
 331         p_priv->pf_destructor( p_this );
 332
 333     /* Sanity checks */
 334     if( p_this->i_children )
 335     {
 336         int i;
 337
 338         fprintf( stderr,
 339                  "ERROR: cannot delete object (%i, %s) with %d children\n",
 340                  p_this->i_object_id, p_this->psz_object_name,
 341                  p_this->i_children );
 342
 343         for( i = 0; i < p_this->i_children; i++ )
 344         {
 345             fprintf( stderr,
 346                      "ERROR: Remaining children object "
 347                      "(id:%i, type:%s, name:%s)\n",
 348                      p_this->pp_children[i]->i_object_id,
 349                      p_this->pp_children[i]->psz_object_type,
 350                      p_this->pp_children[i]->psz_object_name );
 351         }
 352         fflush(stderr);
 353
 354         /* Dump libvlc object to ease debugging */
 355         vlc_object_dump( p_this->p_libvlc );
 356
 357         abort();
 358     }
 359
 360     /* Destroy the associated variables, starting from the end so that
 361      * no memmove calls have to be done. */
 362     while( p_priv->i_vars )
 363     {
 364         var_Destroy( p_this, p_priv->p_vars[p_priv->i_vars - 1].psz_name );
 365     }
 366
 367     free( p_priv->p_vars );
 368     vlc_mutex_destroy( &p_priv->var_lock );
 369
 370     free( p_this->psz_header );
 371
 372     if( p_this->p_libvlc == NULL )
 373     {
 374         libvlc_global_data_t *p_global = (libvlc_global_data_t *)p_this;
 375
 376 #ifndef NDEBUG
 377         assert( p_global == vlc_global() );
 378         /* Test for leaks */
 379         if( p_global->i_objects > 0 )
 380         {
 381             int i;
 382             for( i = 0; i < p_global->i_objects; i++ )
 383             {
 384                 /* We are leaking this object */
 385                 fprintf( stderr,
 386                          "ERROR: leaking object (id:%i, type:%s, name:%s)\n",
 387                          p_global->pp_objects[i]->i_object_id,
 388                          p_global->pp_objects[i]->psz_object_type,
 389                          p_global->pp_objects[i]->psz_object_name );
 390
 391                 /* Dump libvlc object to ease debugging */
 392                 vlc_object_dump( p_global->pp_objects[i] );
 393
 394                 fflush(stderr);
 395             }
 396
 397             /* Dump libvlc object to ease debugging */
 398             vlc_object_dump( p_this );
 399
 400             /* Strongly abort, cause we want these to be fixed */
 401             abort();
 402         }
 403 #endif
 404
 405         /* We are the global object ... no need to lock. */
 406         free( p_global->pp_objects );
 407         p_global->pp_objects = NULL;
 408
 409         vlc_mutex_destroy( &structure_lock );
 410     }
 411
 412     FREENULL( p_this->psz_object_name );
 413
 414 #if defined(WIN32) || defined(UNDER_CE)
 415     /* if object has an associated thread, close it now */
 416     if( p_priv->thread_id )
 417        CloseHandle(p_priv->thread_id);
 418 #endif
 419
 420     vlc_spin_destroy( &p_priv->ref_spin );
 421     vlc_mutex_destroy( &p_this->object_lock );
 422     vlc_cond_destroy( &p_this->object_wait );
 423     vlc_spin_destroy( &p_priv->spin );
 424     if( p_priv->pipes[1] != -1 )
 425         close( p_priv->pipes[1] );
 426     if( p_priv->pipes[0] != -1 )
 427         close( p_priv->pipes[0] );
 428
 429     free( p_priv );
 430 }
 431
 432
 433 /** Inter-object signaling */
 434
 435 void __vlc_object_lock( vlc_object_t *obj )
 436 {
 437     vlc_mutex_lock( &obj->object_lock );
 438 }
 439
 440 void __vlc_object_unlock( vlc_object_t *obj )
 441 {
 442     vlc_assert_locked( &obj->object_lock );
 443     vlc_mutex_unlock( &obj->object_lock );
 444 }
 445
 446 #ifdef WIN32
 447 # include <winsock2.h>
 448 # include <ws2tcpip.h>
 449
 450 /**
 451  * select()-able pipes emulated using Winsock
 452  */
 453 static int pipe (int fd[2])
 454 {
 455     SOCKADDR_IN addr;
 456     int addrlen = sizeof (addr);
 457
 458     SOCKET l = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP), a,
 459            c = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
 460     if ((l == INVALID_SOCKET) || (c == INVALID_SOCKET))
 461         goto error;
 462
 463     memset (&addr, 0, sizeof (addr));
 464     addr.sin_family = AF_INET;
 465     addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
 466     if (bind (l, (PSOCKADDR)&addr, sizeof (addr))
 467      || getsockname (l, (PSOCKADDR)&addr, &addrlen)
 468      || listen (l, 1)
 469      || connect (c, (PSOCKADDR)&addr, addrlen))
 470         goto error;
 471
 472     a = accept (l, NULL, NULL);
 473     if (a == INVALID_SOCKET)
 474         goto error;
 475
 476     closesocket (l);
 477     //shutdown (a, 0);
 478     //shutdown (c, 1);
 479     fd[0] = c;
 480     fd[1] = a;
 481     return 0;
 482
 483 error:
 484     if (l != INVALID_SOCKET)
 485         closesocket (l);
 486     if (c != INVALID_SOCKET)
 487         closesocket (c);
 488     return -1;
 489 }
 490
 491 #undef  read
 492 #define read( a, b, c )  recv (a, b, c, 0)
 493 #undef  write
 494 #define write( a, b, c ) send (a, b, c, 0)
 495 #undef  close
 496 #define close( a )       closesocket (a)
 497 #endif /* WIN32 */
 498
 499 /**
 500  * Returns the readable end of a pipe that becomes readable once termination
 501  * of the object is requested (vlc_object_kill()).
 502  * This can be used to wake-up out of a select() or poll() event loop, such
 503  * typically when doing network I/O.
 504  *
 505  * Note that the pipe will remain the same for the lifetime of the object.
 506  * DO NOT read the pipe nor close it yourself. Ever.
 507  *
 508  * @param obj object that would be "killed"
 509  * @return a readable pipe descriptor, or -1 on error.
 510  */
 511 int __vlc_object_waitpipe( vlc_object_t *obj )
 512 {
 513     int pfd[2] = { -1, -1 };
 514     vlc_object_internals_t *internals = vlc_internals( obj );
 515     bool killed = false;
 516
 517     vlc_spin_lock (&internals->spin);
 518     if (internals->pipes[0] == -1)
 519     {
 520         /* This can only ever happen if someone killed us without locking: */
 521         assert (internals->pipes[1] == -1);
 522         vlc_spin_unlock (&internals->spin);
 523
 524         if (pipe (pfd))
 525             return -1;
 526
 527         vlc_spin_lock (&internals->spin);
 528         if (internals->pipes[0] == -1)
 529         {
 530             internals->pipes[0] = pfd[0];
 531             internals->pipes[1] = pfd[1];
 532             pfd[0] = pfd[1] = -1;
 533         }
 534         killed = obj->b_die;
 535     }
 536     vlc_spin_unlock (&internals->spin);
 537
 538     if (killed)
 539     {
 540         /* Race condition: vlc_object_kill() already invoked! */
 541         int fd;
 542
 543         vlc_spin_lock (&internals->spin);
 544         fd = internals->pipes[1];
 545         internals->pipes[1] = -1;
 546         vlc_spin_unlock (&internals->spin);
 547
 548         msg_Dbg (obj, "waitpipe: object already dying");
 549         if (fd != -1)
 550             close (fd);
 551     }
 552
 553     /* Race condition: two threads call pipe() - unlikely */
 554     if (pfd[0] != -1)
 555         close (pfd[0]);
 556     if (pfd[1] != -1)
 557         close (pfd[1]);
 558
 559     return internals->pipes[0];
 560 }
 561
 562
 563 /**
 564  * Waits for the object to be signaled (using vlc_object_signal()).
 565  * If the object already has a signal pending, this function will return
 566  * immediately. It is asserted that the caller holds the object lock.
 567  *
 568  * @return true if the object is dying and should terminate.
 569  */
 570 bool __vlc_object_wait( vlc_object_t *obj )
 571 {
 572     vlc_assert_locked( &obj->object_lock );
 573     vlc_cond_wait( &obj->object_wait, &obj->object_lock );
 574     return obj->b_die;
 575 }
 576
 577
 578 /**
 579  * Waits for the object to be signaled (using vlc_object_signal()), or for
 580  * a timer to expire.
 581  * If the object already has a signal pending, this function will return
 582  * immediately. It is asserted that the caller holds the object lock.
 583  *
 584  * @return negative if the object is dying and should terminate,
 585  * positive if the the object has been signaled but is not dying,
 586  * 0 if timeout has been reached.
 587  */
 588 int __vlc_object_timedwait( vlc_object_t *obj, mtime_t deadline )
 589 {
 590     int v;
 591
 592     vlc_assert_locked( &obj->object_lock );
 593     v = vlc_cond_timedwait( &obj->object_wait, &obj->object_lock, deadline );
 594     if( v == 0 ) /* signaled */
 595         return obj->b_die ? -1 : 1;
 596     return 0;
 597 }
 598
 599
 600 /**
 601  * Checks whether an object has been "killed".
 602  * The object lock must be held.
 603  *
 604  * Typical code for an object thread could be:
 605  *
 606    vlc_object_lock (self);
 607    ...initialization...
 608    while (vlc_object_alive (self))
 609    {
 610        ...preprocessing...
 611
 612        if (vlc_object_wait (self))
 613            continue;
 614
 615        ...postprocessing...
 616    }
 617    ...deinitialization...
 618    vlc_object_unlock (self);
 619  *
 620  *
 621  * @return true iff the object has not been killed yet
 622  */
 623 bool __vlc_object_alive( vlc_object_t *obj )
 624 {
 625     vlc_assert_locked( &obj->object_lock );
 626     return !obj->b_die;
 627 }
 628
 629
 630 /**
 631  * Signals an object for which the lock is held.
 632  */
 633 void __vlc_object_signal_unlocked( vlc_object_t *obj )
 634 {
 635     vlc_assert_locked (&obj->object_lock);
 636     vlc_cond_signal( &obj->object_wait );
 637 }
 638
 639
 640 /**
 641  * Requests termination of an object.
 642  * If the object is LibVLC, also request to terminate all its children.
 643  */
 644 void __vlc_object_kill( vlc_object_t *p_this )
 645 {
 646     vlc_object_internals_t *internals = vlc_internals( p_this );
 647     int fd;
 648
 649     vlc_mutex_lock( &p_this->object_lock );
 650     p_this->b_die = true;
 651
 652     vlc_spin_lock (&internals->spin);
 653     fd = internals->pipes[1];
 654     internals->pipes[1] = -1;
 655     vlc_spin_unlock (&internals->spin);
 656
 657     if( fd != -1 )
 658     {
 659         msg_Dbg (p_this, "waitpipe: object killed");
 660         close (fd);
 661     }
 662
 663     if( p_this->i_object_type == VLC_OBJECT_LIBVLC )
 664         for( int i = 0; i < p_this->i_children ; i++ )
 665             vlc_object_kill( p_this->pp_children[i] );
 666
 667     vlc_object_signal_unlocked( p_this );
 668     vlc_mutex_unlock( &p_this->object_lock );
 669 }
 670
 671
 672 /**
 673  * find an object given its ID
 674  *
 675  * This function looks for the object whose i_object_id field is i_id. We
 676  * use a dichotomy so that lookups are in log2(n).
 677  *****************************************************************************/
 678 void * vlc_object_get( int i_id )
 679 {
 680     int i_max, i_middle;
 681     vlc_object_t **pp_objects;
 682     libvlc_global_data_t *p_libvlc_global = vlc_global();
 683     vlc_object_t *obj = NULL;
 684
 685     vlc_mutex_lock( &structure_lock );
 686
 687     pp_objects = p_libvlc_global->pp_objects;
 688
 689     /* Perform our dichotomy */
 690     for( i_max = p_libvlc_global->i_objects - 1 ; ; )
 691     {
 692         i_middle = i_max / 2;
 693
 694         if( pp_objects[i_middle]->i_object_id > i_id )
 695         {
 696             i_max = i_middle;
 697         }
 698         else if( pp_objects[i_middle]->i_object_id < i_id )
 699         {
 700             if( i_middle )
 701             {
 702                 pp_objects += i_middle;
 703                 i_max -= i_middle;
 704             }
 705             else
 706             {
 707                 /* This happens when there are only two remaining objects */
 708                 if( pp_objects[i_middle+1]->i_object_id == i_id )
 709                 {
 710                     vlc_object_yield( pp_objects[i_middle+1] );
 711                     obj = pp_objects[i_middle+1];
 712                 }
 713                 break;
 714             }
 715         }
 716         else
 717         {
 718             vlc_object_yield( pp_objects[i_middle] );
 719             obj = pp_objects[i_middle];
 720             break;
 721         }
 722     }
 723
 724     vlc_mutex_unlock( &structure_lock );
 725     return obj;
 726 }
 727
 728 /**
 729  ****************************************************************************
 730  * find a typed object and increment its refcount
 731  *****************************************************************************
 732  * This function recursively looks for a given object type. i_mode can be one
 733  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 734  *****************************************************************************/
 735 void * __vlc_object_find( vlc_object_t *p_this, int i_type, int i_mode )
 736 {
 737     vlc_object_t *p_found;
 738
 739     /* If we are of the requested type ourselves, don't look further */
 740     if( !(i_mode & FIND_STRICT) && p_this->i_object_type == i_type )
 741     {
 742         vlc_object_yield( p_this );
 743         return p_this;
 744     }
 745
 746     vlc_mutex_lock( &structure_lock );
 747
 748     /* Otherwise, recursively look for the object */
 749     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 750     {
 751         vlc_object_t *p_root = p_this;
 752
 753         /* Find the root */
 754         while( p_root->p_parent != NULL &&
 755                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 756         {
 757             p_root = p_root->p_parent;
 758         }
 759
 760         p_found = FindObject( p_root, i_type, (i_mode & ~0x000f)|FIND_CHILD );
 761         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 762         {
 763             p_found = FindObject( VLC_OBJECT( p_this->p_libvlc ),
 764                                   i_type, (i_mode & ~0x000f)|FIND_CHILD );
 765         }
 766     }
 767     else
 768     {
 769         p_found = FindObject( p_this, i_type, i_mode );
 770     }
 771
 772     vlc_mutex_unlock( &structure_lock );
 773
 774     return p_found;
 775 }
 776
 777 /**
 778  ****************************************************************************
 779  * find a named object and increment its refcount
 780  *****************************************************************************
 781  * This function recursively looks for a given object name. i_mode can be one
 782  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 783  *****************************************************************************/
 784 void * __vlc_object_find_name( vlc_object_t *p_this, const char *psz_name,
 785                                int i_mode )
 786 {
 787     vlc_object_t *p_found;
 788
 789     /* If have the requested name ourselves, don't look further */
 790     if( !(i_mode & FIND_STRICT)
 791         && p_this->psz_object_name
 792         && !strcmp( p_this->psz_object_name, psz_name ) )
 793     {
 794         vlc_object_yield( p_this );
 795         return p_this;
 796     }
 797
 798     vlc_mutex_lock( &structure_lock );
 799
 800     /* Otherwise, recursively look for the object */
 801     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 802     {
 803         vlc_object_t *p_root = p_this;
 804
 805         /* Find the root */
 806         while( p_root->p_parent != NULL &&
 807                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 808         {
 809             p_root = p_root->p_parent;
 810         }
 811
 812         p_found = FindObjectName( p_root, psz_name,
 813                                  (i_mode & ~0x000f)|FIND_CHILD );
 814         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 815         {
 816             p_found = FindObjectName( VLC_OBJECT( p_this->p_libvlc ),
 817                                       psz_name, (i_mode & ~0x000f)|FIND_CHILD );
 818         }
 819     }
 820     else
 821     {
 822         p_found = FindObjectName( p_this, psz_name, i_mode );
 823     }
 824
 825     vlc_mutex_unlock( &structure_lock );
 826
 827     return p_found;
 828 }
 829
 830 /**
 831  * Increment an object reference counter.
 832  */
 833 void __vlc_object_yield( vlc_object_t *p_this )
 834 {
 835     vlc_object_internals_t *internals = vlc_internals( p_this );
 836
 837     vlc_spin_lock( &internals->ref_spin );
 838     /* Avoid obvious freed object uses */
 839     assert( internals->i_refcount > 0 );
 840     /* Increment the counter */
 841     internals->i_refcount++;
 842     vlc_spin_unlock( &internals->ref_spin );
 843 }
 844
 845 /*****************************************************************************
 846  * decrement an object refcount
 847  * And destroy the object if its refcount reach zero.
 848  *****************************************************************************/
 849 void __vlc_object_release( vlc_object_t *p_this )
 850 {
 851     vlc_object_internals_t *internals = vlc_internals( p_this );
 852     bool b_should_destroy;
 853
 854     vlc_spin_lock( &internals->ref_spin );
 855     assert( internals->i_refcount > 0 );
 856
 857     if( internals->i_refcount > 1 )
 858     {
 859         /* Fast path */
 860         /* There are still other references to the object */
 861         internals->i_refcount--;
 862         vlc_spin_unlock( &internals->ref_spin );
 863         return;
 864     }
 865     vlc_spin_unlock( &internals->ref_spin );
 866
 867     /* Slow path */
 868     /* Remember that we cannot hold the spin while waiting on the mutex */
 869     vlc_mutex_lock( &structure_lock );
 870     /* Take the spin again. Note that another thread may have yielded the
 871      * object in the (very short) mean time. */
 872     vlc_spin_lock( &internals->ref_spin );
 873     b_should_destroy = --internals->i_refcount == 0;
 874     vlc_spin_unlock( &internals->ref_spin );
 875
 876     if( b_should_destroy )
 877     {
 878         /* Remove the object from the table so that it cannot be returned from
 879          * vlc_object_find() and friends. */
 880         libvlc_global_data_t *p_libvlc_global = vlc_global();
 881         int i_index;
 882
 883         i_index = FindIndex( p_this, p_libvlc_global->pp_objects,
 884                              p_libvlc_global->i_objects );
 885         REMOVE_ELEM( p_libvlc_global->pp_objects,
 886                      p_libvlc_global->i_objects, i_index );
 887         if (p_this->p_parent)
 888             vlc_object_detach_unlocked (p_this);
 889     }
 890
 891     vlc_mutex_unlock( &structure_lock );
 892
 893     if( b_should_destroy )
 894         vlc_object_destroy( p_this );
 895 }
 896
 897 /**
 898  ****************************************************************************
 899  * attach object to a parent object
 900  *****************************************************************************
 901  * This function sets p_this as a child of p_parent, and p_parent as a parent
 902  * of p_this. This link can be undone using vlc_object_detach.
 903  *****************************************************************************/
 904 void __vlc_object_attach( vlc_object_t *p_this, vlc_object_t *p_parent )
 905 {
 906     if( !p_this ) return;
 907
 908     vlc_mutex_lock( &structure_lock );
 909
 910     /* Attach the parent to its child */
 911     p_this->p_parent = p_parent;
 912
 913     /* Attach the child to its parent */
 914     INSERT_ELEM( p_parent->pp_children, p_parent->i_children,
 915                  p_parent->i_children, p_this );
 916
 917     /* Climb up the tree to see whether we are connected with the root */
 918     if( vlc_internals( p_parent )->b_attached )
 919     {
 920         SetAttachment( p_this, true );
 921     }
 922
 923     vlc_mutex_unlock( &structure_lock );
 924 }
 925
 926
 927 static void vlc_object_detach_unlocked (vlc_object_t *p_this)
 928 {
 929     assert (p_this->p_parent);
 930
 931     /* Climb up the tree to see whether we are connected with the root */
 932     if( vlc_internals( p_this->p_parent )->b_attached )
 933         SetAttachment( p_this, false );
 934
 935     DetachObject( p_this );
 936 }
 937
 938
 939 /**
 940  ****************************************************************************
 941  * detach object from its parent
 942  *****************************************************************************
 943  * This function removes all links between an object and its parent.
 944  *****************************************************************************/
 945 void __vlc_object_detach( vlc_object_t *p_this )
 946 {
 947     if( !p_this ) return;
 948
 949     vlc_mutex_lock( &structure_lock );
 950
 951     if( !p_this->p_parent )
 952     {
 953         msg_Err( p_this, "object is not attached" );
 954         vlc_mutex_unlock( &structure_lock );
 955         return;
 956     }
 957
 958     vlc_object_detach_unlocked( p_this );
 959     vlc_mutex_unlock( &structure_lock );
 960 }
 961
 962 /**
 963  ****************************************************************************
 964  * find a list typed objects and increment their refcount
 965  *****************************************************************************
 966  * This function recursively looks for a given object type. i_mode can be one
 967  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 968  *****************************************************************************/
 969 vlc_list_t * __vlc_list_find( vlc_object_t *p_this, int i_type, int i_mode )
 970 {
 971     vlc_list_t *p_list;
 972     vlc_object_t **pp_current, **pp_end;
 973     int i_count = 0, i_index = 0;
 974     libvlc_global_data_t *p_libvlc_global = vlc_global();
 975
 976     vlc_mutex_lock( &structure_lock );
 977
 978     /* Look for the objects */
 979     switch( i_mode & 0x000f )
 980     {
 981     case FIND_ANYWHERE:
 982         pp_current = p_libvlc_global->pp_objects;
 983         pp_end = pp_current + p_libvlc_global->i_objects;
 984
 985         for( ; pp_current < pp_end ; pp_current++ )
 986         {
 987             if( vlc_internals(*pp_current)->b_attached
 988                  && (*pp_current)->i_object_type == i_type )
 989             {
 990                 i_count++;
 991             }
 992         }
 993
 994         p_list = NewList( i_count );
 995         pp_current = p_libvlc_global->pp_objects;
 996
 997         for( ; pp_current < pp_end ; pp_current++ )
 998         {
 999             if( vlc_internals(*pp_current)->b_attached
1000                  && (*pp_current)->i_object_type == i_type )
1001             {
1002                 ListReplace( p_list, *pp_current, i_index );
1003                 if( i_index < i_count ) i_index++;
1004             }
1005         }
1006     break;
1007
1008     case FIND_CHILD:
1009         i_count = CountChildren( p_this, i_type );
1010         p_list = NewList( i_count );
1011
1012         /* Check allocation was successful */
1013         if( p_list->i_count != i_count )
1014         {
1015             msg_Err( p_this, "list allocation failed!" );
1016             p_list->i_count = 0;
1017             break;
1018         }
1019
1020         p_list->i_count = 0;
1021         ListChildren( p_list, p_this, i_type );
1022         break;
1023
1024     default:
1025         msg_Err( p_this, "unimplemented!" );
1026         p_list = NewList( 0 );
1027         break;
1028     }
1029
1030     vlc_mutex_unlock( &structure_lock );
1031
1032     return p_list;
1033 }
1034
1035 /*****************************************************************************
1036  * DumpCommand: print the current vlc structure
1037  *****************************************************************************
1038  * This function prints either an ASCII tree showing the connections between
1039  * vlc objects, and additional information such as their refcount, thread ID,
1040  * etc. (command "tree"), or the same data as a simple list (command "list").
1041  *****************************************************************************/
1042 static int DumpCommand( vlc_object_t *p_this, char const *psz_cmd,
1043                         vlc_value_t oldval, vlc_value_t newval, void *p_data )
1044 {
1045     libvlc_global_data_t *p_libvlc_global = vlc_global();
1046
1047     (void)oldval; (void)p_data;
1048     if( *psz_cmd == 'l' )
1049     {
1050         vlc_mutex_lock( &structure_lock );
1051
1052         vlc_object_t **pp_current, **pp_end;
1053
1054         pp_current = p_libvlc_global->pp_objects;
1055         pp_end = pp_current + p_libvlc_global->i_objects;
1056
1057         for( ; pp_current < pp_end ; pp_current++ )
1058         {
1059             if( vlc_internals(*pp_current)->b_attached )
1060             {
1061                 PrintObject( *pp_current, "" );
1062             }
1063             else
1064             {
1065                 printf( " o %.8i %s (not attached)\n",
1066                         (*pp_current)->i_object_id,
1067                         (*pp_current)->psz_object_type );
1068             }
1069         }
1070
1071         vlc_mutex_unlock( &structure_lock );
1072     }
1073     else
1074     {
1075         vlc_object_t *p_object = NULL;
1076
1077         if( *newval.psz_string )
1078         {
1079             char *end;
1080             int i_id = strtol( newval.psz_string, &end, 0 );
1081             if( end != newval.psz_string )
1082                 p_object = vlc_object_get( i_id );
1083             else
1084             {
1085                 /* try using the object's name to find it */
1086                 vlc_object_t *p_libvlc = vlc_object_get( 1 );
1087                 if( p_libvlc )
1088                 {
1089                     /* Look in p_libvlc's children tree */
1090                     p_object = vlc_object_find_name( p_libvlc,
1091                                                      newval.psz_string,
1092                                                      FIND_CHILD );
1093                     vlc_object_release( p_libvlc );
1094                 }
1095                 if( !p_object )
1096                 {
1097                     /* If it's not in libvlc, look in libvlc_global (== p_this) */
1098                     p_object = vlc_object_find_name( p_this,
1099                                                      newval.psz_string,
1100                                                      FIND_CHILD );
1101                 }
1102             }
1103
1104             if( !p_object )
1105             {
1106                 return VLC_ENOOBJ;
1107             }
1108         }
1109
1110         vlc_mutex_lock( &structure_lock );
1111
1112         if( *psz_cmd == 't' )
1113         {
1114             char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
1115
1116             if( !p_object )
1117                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1118
1119             psz_foo[0] = '|';
1120             DumpStructure( p_object, 0, psz_foo );
1121         }
1122         else if( *psz_cmd == 'v' )
1123         {
1124             int i;
1125
1126             if( !p_object )
1127                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1128
1129             PrintObject( p_object, "" );
1130
1131             if( !vlc_internals( p_object )->i_vars )
1132                 printf( " `-o No variables\n" );
1133             for( i = 0; i < vlc_internals( p_object )->i_vars; i++ )
1134             {
1135                 variable_t *p_var = vlc_internals( p_object )->p_vars + i;
1136
1137                 const char *psz_type = "unknown";
1138                 switch( p_var->i_type & VLC_VAR_TYPE )
1139                 {
1140 #define MYCASE( type, nice )                \
1141                     case VLC_VAR_ ## type:  \
1142                         psz_type = nice;    \
1143                         break;
1144                     MYCASE( VOID, "void" );
1145                     MYCASE( BOOL, "bool" );
1146                     MYCASE( INTEGER, "integer" );
1147                     MYCASE( HOTKEY, "hotkey" );
1148                     MYCASE( STRING, "string" );
1149                     MYCASE( MODULE, "module" );
1150                     MYCASE( FILE, "file" );
1151                     MYCASE( DIRECTORY, "directory" );
1152                     MYCASE( VARIABLE, "variable" );
1153                     MYCASE( FLOAT, "float" );
1154                     MYCASE( TIME, "time" );
1155                     MYCASE( ADDRESS, "address" );
1156                     MYCASE( MUTEX, "mutex" );
1157                     MYCASE( LIST, "list" );
1158 #undef MYCASE
1159                 }
1160                 printf( " %c-o \"%s\" (%s",
1161                         i + 1 == vlc_internals( p_object )->i_vars ? '`' : '|',
1162                         p_var->psz_name, psz_type );
1163                 if( p_var->psz_text )
1164                     printf( ", %s", p_var->psz_text );
1165                 printf( ")" );
1166                 if( p_var->i_type & VLC_VAR_ISCOMMAND )
1167                     printf( ", command" );
1168                 if( p_var->i_entries )
1169                     printf( ", %d callbacks", p_var->i_entries );
1170                 switch( p_var->i_type & 0x00f0 )
1171                 {
1172                     case VLC_VAR_VOID:
1173                     case VLC_VAR_MUTEX:
1174                         break;
1175                     case VLC_VAR_BOOL:
1176                         printf( ": %s", p_var->val.b_bool ? "true" : "false" );
1177                         break;
1178                     case VLC_VAR_INTEGER:
1179                         printf( ": %d", p_var->val.i_int );
1180                         break;
1181                     case VLC_VAR_STRING:
1182                         printf( ": \"%s\"", p_var->val.psz_string );
1183                         break;
1184                     case VLC_VAR_FLOAT:
1185                         printf( ": %f", p_var->val.f_float );
1186                         break;
1187                     case VLC_VAR_TIME:
1188                         printf( ": %"PRIi64, (int64_t)p_var->val.i_time );
1189                         break;
1190                     case VLC_VAR_ADDRESS:
1191                         printf( ": %p", p_var->val.p_address );
1192                         break;
1193                     case VLC_VAR_LIST:
1194                         printf( ": TODO" );
1195                         break;
1196                 }
1197                 printf( "\n" );
1198             }
1199         }
1200
1201         vlc_mutex_unlock( &structure_lock );
1202
1203         if( *newval.psz_string )
1204         {
1205             vlc_object_release( p_object );
1206         }
1207     }
1208
1209     return VLC_SUCCESS;
1210 }
1211
1212 /*****************************************************************************
1213  * vlc_list_release: free a list previously allocated by vlc_list_find
1214  *****************************************************************************
1215  * This function decreases the refcount of all objects in the list and
1216  * frees the list.
1217  *****************************************************************************/
1218 void vlc_list_release( vlc_list_t *p_list )
1219 {
1220     int i_index;
1221
1222     for( i_index = 0; i_index < p_list->i_count; i_index++ )
1223     {
1224         vlc_object_release( p_list->p_values[i_index].p_object );
1225     }
1226
1227     free( p_list->p_values );
1228     free( p_list );
1229 }
1230
1231 /*****************************************************************************
1232  * dump an object. (Debug function)
1233  *****************************************************************************/
1234 void __vlc_object_dump( vlc_object_t *p_this )
1235 {
1236     vlc_mutex_lock( &structure_lock );
1237     char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
1238     psz_foo[0] = '|';
1239     DumpStructure( p_this, 0, psz_foo );
1240     vlc_mutex_unlock( &structure_lock );
1241 }
1242
1243 /* Following functions are local */
1244
1245 /*****************************************************************************
1246  * FindIndex: find the index of an object in an array of objects
1247  *****************************************************************************
1248  * This function assumes that p_this can be found in pp_objects. It will not
1249  * crash if p_this cannot be found, but will return a wrong value. It is your
1250  * duty to check the return value if you are not certain that the object could
1251  * be found for sure.
1252  *****************************************************************************/
1253 static int FindIndex( vlc_object_t *p_this,
1254                       vlc_object_t **pp_objects, int i_count )
1255 {
1256     int i_middle = i_count / 2;
1257
1258     if( i_count == 0 )
1259     {
1260         return 0;
1261     }
1262
1263     if( pp_objects[i_middle] == p_this )
1264     {
1265         return i_middle;
1266     }
1267
1268     if( i_count == 1 )
1269     {
1270         return 0;
1271     }
1272
1273     /* We take advantage of the sorted array */
1274     if( pp_objects[i_middle]->i_object_id < p_this->i_object_id )
1275     {
1276         return i_middle + FindIndex( p_this, pp_objects + i_middle,
1277                                              i_count - i_middle );
1278     }
1279     else
1280     {
1281         return FindIndex( p_this, pp_objects, i_middle );
1282     }
1283 }
1284
1285 static vlc_object_t * FindObject( vlc_object_t *p_this, int i_type, int i_mode )
1286 {
1287     int i;
1288     vlc_object_t *p_tmp;
1289
1290     switch( i_mode & 0x000f )
1291     {
1292     case FIND_PARENT:
1293         p_tmp = p_this->p_parent;
1294         if( p_tmp )
1295         {
1296             if( p_tmp->i_object_type == i_type )
1297             {
1298                 vlc_object_yield( p_tmp );
1299                 return p_tmp;
1300             }
1301             else
1302             {
1303                 return FindObject( p_tmp, i_type, i_mode );
1304             }
1305         }
1306         break;
1307
1308     case FIND_CHILD:
1309         for( i = p_this->i_children; i--; )
1310         {
1311             p_tmp = p_this->pp_children[i];
1312             if( p_tmp->i_object_type == i_type )
1313             {
1314                 vlc_object_yield( p_tmp );
1315                 return p_tmp;
1316             }
1317             else if( p_tmp->i_children )
1318             {
1319                 p_tmp = FindObject( p_tmp, i_type, i_mode );
1320                 if( p_tmp )
1321                 {
1322                     return p_tmp;
1323                 }
1324             }
1325         }
1326         break;
1327
1328     case FIND_ANYWHERE:
1329         /* Handled in vlc_object_find */
1330         break;
1331     }
1332
1333     return NULL;
1334 }
1335
1336 static vlc_object_t * FindObjectName( vlc_object_t *p_this,
1337                                       const char *psz_name,
1338                                       int i_mode )
1339 {
1340     int i;
1341     vlc_object_t *p_tmp;
1342
1343     switch( i_mode & 0x000f )
1344     {
1345     case FIND_PARENT:
1346         p_tmp = p_this->p_parent;
1347         if( p_tmp )
1348         {
1349             if( p_tmp->psz_object_name
1350                 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1351             {
1352                 vlc_object_yield( p_tmp );
1353                 return p_tmp;
1354             }
1355             else
1356             {
1357                 return FindObjectName( p_tmp, psz_name, i_mode );
1358             }
1359         }
1360         break;
1361
1362     case FIND_CHILD:
1363         for( i = p_this->i_children; i--; )
1364         {
1365             p_tmp = p_this->pp_children[i];
1366             if( p_tmp->psz_object_name
1367                 && !strcmp( p_tmp->psz_object_name, psz_name ) )
1368             {
1369                 vlc_object_yield( p_tmp );
1370                 return p_tmp;
1371             }
1372             else if( p_tmp->i_children )
1373             {
1374                 p_tmp = FindObjectName( p_tmp, psz_name, i_mode );
1375                 if( p_tmp )
1376                 {
1377                     return p_tmp;
1378                 }
1379             }
1380         }
1381         break;
1382
1383     case FIND_ANYWHERE:
1384         /* Handled in vlc_object_find */
1385         break;
1386     }
1387
1388     return NULL;
1389 }
1390
1391 static void DetachObject( vlc_object_t *p_this )
1392 {
1393     vlc_object_t *p_parent = p_this->p_parent;
1394     int i_index, i;
1395
1396     /* Remove p_this's parent */
1397     p_this->p_parent = NULL;
1398
1399     /* Remove all of p_parent's children which are p_this */
1400     for( i_index = p_parent->i_children ; i_index-- ; )
1401     {
1402         if( p_parent->pp_children[i_index] == p_this )
1403         {
1404             p_parent->i_children--;
1405             for( i = i_index ; i < p_parent->i_children ; i++ )
1406             {
1407                 p_parent->pp_children[i] = p_parent->pp_children[i+1];
1408             }
1409         }
1410     }
1411
1412     if( p_parent->i_children )
1413     {
1414         p_parent->pp_children = (vlc_object_t **)realloc( p_parent->pp_children,
1415                                p_parent->i_children * sizeof(vlc_object_t *) );
1416     }
1417     else
1418     {
1419         free( p_parent->pp_children );
1420         p_parent->pp_children = NULL;
1421     }
1422 }
1423
1424 /*****************************************************************************
1425  * SetAttachment: recursively set the b_attached flag of a subtree.
1426  *****************************************************************************
1427  * This function is used by the attach and detach functions to propagate
1428  * the b_attached flag in a subtree.
1429  *****************************************************************************/
1430 static void SetAttachment( vlc_object_t *p_this, bool b_attached )
1431 {
1432     int i_index;
1433
1434     for( i_index = p_this->i_children ; i_index-- ; )
1435     {
1436         SetAttachment( p_this->pp_children[i_index], b_attached );
1437     }
1438
1439     vlc_internals( p_this )->b_attached = b_attached;
1440 }
1441
1442 static void PrintObject( vlc_object_t *p_this, const char *psz_prefix )
1443 {
1444     char psz_children[20], psz_refcount[20], psz_thread[30], psz_name[50],
1445          psz_parent[20];
1446
1447     memset( &psz_name, 0, sizeof(psz_name) );
1448     if( p_this->psz_object_name )
1449     {
1450         snprintf( psz_name, 49, " \"%s\"", p_this->psz_object_name );
1451         if( psz_name[48] )
1452             psz_name[48] = '\"';
1453     }
1454
1455     psz_children[0] = '\0';
1456     switch( p_this->i_children )
1457     {
1458         case 0:
1459             break;
1460         case 1:
1461             strcpy( psz_children, ", 1 child" );
1462             break;
1463         default:
1464             snprintf( psz_children, 19, ", %i children", p_this->i_children );
1465             break;
1466     }
1467
1468     psz_refcount[0] = '\0';
1469     if( vlc_internals( p_this )->i_refcount > 0 )
1470         snprintf( psz_refcount, 19, ", refcount %u",
1471                   vlc_internals( p_this )->i_refcount );
1472
1473     psz_thread[0] = '\0';
1474     if( vlc_internals( p_this )->b_thread )
1475         snprintf( psz_thread, 29, " (thread %lu)",
1476                   (unsigned long)vlc_internals( p_this )->thread_id );
1477
1478     psz_parent[0] = '\0';
1479     if( p_this->p_parent )
1480         snprintf( psz_parent, 19, ", parent %i", p_this->p_parent->i_object_id );
1481
1482     printf( " %so %.8i %s%s%s%s%s%s\n", psz_prefix,
1483             p_this->i_object_id, p_this->psz_object_type,
1484             psz_name, psz_thread, psz_refcount, psz_children,
1485             psz_parent );
1486 }
1487
1488 static void DumpStructure( vlc_object_t *p_this, int i_level, char *psz_foo )
1489 {
1490     int i;
1491     char i_back = psz_foo[i_level];
1492     psz_foo[i_level] = '\0';
1493
1494     PrintObject( p_this, psz_foo );
1495
1496     psz_foo[i_level] = i_back;
1497
1498     if( i_level / 2 >= MAX_DUMPSTRUCTURE_DEPTH )
1499     {
1500         msg_Warn( p_this, "structure tree is too deep" );
1501         return;
1502     }
1503
1504     for( i = 0 ; i < p_this->i_children ; i++ )
1505     {
1506         if( i_level )
1507         {
1508             psz_foo[i_level-1] = ' ';
1509
1510             if( psz_foo[i_level-2] == '`' )
1511             {
1512                 psz_foo[i_level-2] = ' ';
1513             }
1514         }
1515
1516         if( i == p_this->i_children - 1 )
1517         {
1518             psz_foo[i_level] = '`';
1519         }
1520         else
1521         {
1522             psz_foo[i_level] = '|';
1523         }
1524
1525         psz_foo[i_level+1] = '-';
1526         psz_foo[i_level+2] = '\0';
1527
1528         DumpStructure( p_this->pp_children[i], i_level + 2, psz_foo );
1529     }
1530 }
1531
1532 static vlc_list_t * NewList( int i_count )
1533 {
1534     vlc_list_t * p_list = (vlc_list_t *)malloc( sizeof( vlc_list_t ) );
1535     if( p_list == NULL )
1536     {
1537         return NULL;
1538     }
1539
1540     p_list->i_count = i_count;
1541
1542     if( i_count == 0 )
1543     {
1544         p_list->p_values = NULL;
1545         return p_list;
1546     }
1547
1548     p_list->p_values = malloc( i_count * sizeof( vlc_value_t ) );
1549     if( p_list->p_values == NULL )
1550     {
1551         p_list->i_count = 0;
1552         return p_list;
1553     }
1554
1555     return p_list;
1556 }
1557
1558 static void ListReplace( vlc_list_t *p_list, vlc_object_t *p_object,
1559                          int i_index )
1560 {
1561     if( p_list == NULL || i_index >= p_list->i_count )
1562     {
1563         return;
1564     }
1565
1566     vlc_object_yield( p_object );
1567
1568     p_list->p_values[i_index].p_object = p_object;
1569
1570     return;
1571 }
1572
1573 /*static void ListAppend( vlc_list_t *p_list, vlc_object_t *p_object )
1574 {
1575     if( p_list == NULL )
1576     {
1577         return;
1578     }
1579
1580     p_list->p_values = realloc( p_list->p_values, (p_list->i_count + 1)
1581                                 * sizeof( vlc_value_t ) );
1582     if( p_list->p_values == NULL )
1583     {
1584         p_list->i_count = 0;
1585         return;
1586     }
1587
1588     vlc_object_yield( p_object );
1589
1590     p_list->p_values[p_list->i_count].p_object = p_object;
1591     p_list->i_count++;
1592
1593     return;
1594 }*/
1595
1596 static int CountChildren( vlc_object_t *p_this, int i_type )
1597 {
1598     vlc_object_t *p_tmp;
1599     int i, i_count = 0;
1600
1601     for( i = 0; i < p_this->i_children; i++ )
1602     {
1603         p_tmp = p_this->pp_children[i];
1604
1605         if( p_tmp->i_object_type == i_type )
1606         {
1607             i_count++;
1608         }
1609
1610         if( p_tmp->i_children )
1611         {
1612             i_count += CountChildren( p_tmp, i_type );
1613         }
1614     }
1615
1616     return i_count;
1617 }
1618
1619 static void ListChildren( vlc_list_t *p_list, vlc_object_t *p_this, int i_type )
1620 {
1621     vlc_object_t *p_tmp;
1622     int i;
1623
1624     for( i = 0; i < p_this->i_children; i++ )
1625     {
1626         p_tmp = p_this->pp_children[i];
1627
1628         if( p_tmp->i_object_type == i_type )
1629         {
1630             ListReplace( p_list, p_tmp, p_list->i_count++ );
1631         }
1632
1633         if( p_tmp->i_children )
1634         {
1635             ListChildren( p_list, p_tmp, i_type );
1636         }
1637     }
1638 }