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_tls.h"
  60 #include "vlc_xml.h"
  61 #include "vlc_osd.h"
  62 #include "vlc_meta.h"
  63
  64 #include "variables.h"
  65 #ifndef WIN32
  66 # include <unistd.h>
  67 #else
  68 # include <io.h>
  69 # include <fcntl.h>
  70 # include <errno.h> /* ENOSYS */
  71 #endif
  72 #include <assert.h>
  73
  74 /*****************************************************************************
  75  * Constants
  76  *****************************************************************************/
  77
  78 const vlc_destructor_t kVLCDestructor = NULL;
  79
  80 /*****************************************************************************
  81  * Local prototypes
  82  *****************************************************************************/
  83 static int  DumpCommand( vlc_object_t *, char const *,
  84                          vlc_value_t, vlc_value_t, void * );
  85
  86 static vlc_object_t * FindObject    ( vlc_object_t *, int, int );
  87 static vlc_object_t * FindObjectName( vlc_object_t *, const char *, int );
  88 static void           DetachObject  ( vlc_object_t * );
  89 static void           PrintObject   ( vlc_object_t *, const char * );
  90 static void           DumpStructure ( vlc_object_t *, int, char * );
  91 static int            FindIndex     ( vlc_object_t *, vlc_object_t **, int );
  92 static void           SetAttachment ( vlc_object_t *, vlc_bool_t );
  93
  94 static vlc_list_t   * NewList       ( int );
  95 static void           ListReplace   ( vlc_list_t *, vlc_object_t *, int );
  96 /*static void           ListAppend    ( vlc_list_t *, vlc_object_t * );*/
  97 static int            CountChildren ( vlc_object_t *, int );
  98 static void           ListChildren  ( vlc_list_t *, vlc_object_t *, int );
  99
 100 static void vlc_object_destroy( vlc_object_t *p_this );
 101 static void vlc_object_yield_locked( vlc_object_t *p_this );
 102
 103 /*****************************************************************************
 104  * Local structure lock
 105  *****************************************************************************/
 106 static vlc_mutex_t    structure_lock;
 107 static vlc_object_internals_t global_internals;
 108
 109 vlc_object_t *vlc_custom_create( vlc_object_t *p_this, size_t i_size,
 110                                  int i_type, const char *psz_type )
 111 {
 112     vlc_object_t *p_new;
 113     vlc_object_internals_t *p_priv;
 114
 115     if( i_type == VLC_OBJECT_GLOBAL )
 116     {
 117         p_new = p_this;
 118         p_priv = &global_internals;
 119         memset( p_priv, 0, sizeof( *p_priv ) );
 120     }
 121     else
 122     {
 123         p_priv = calloc( 1, sizeof( *p_priv ) + i_size );
 124         if( p_priv == NULL )
 125             return NULL;
 126
 127         p_new = (vlc_object_t *)(p_priv + 1);
 128     }
 129
 130     p_new->p_internals = p_priv;
 131     p_new->i_object_type = i_type;
 132     p_new->psz_object_type = psz_type;
 133
 134     p_new->psz_object_name = NULL;
 135
 136     p_new->b_die = VLC_FALSE;
 137     p_new->b_error = VLC_FALSE;
 138     p_new->b_dead = VLC_FALSE;
 139     p_priv->b_attached = VLC_FALSE;
 140     p_new->b_force = VLC_FALSE;
 141
 142     p_new->psz_header = NULL;
 143
 144     if( p_this->i_flags & OBJECT_FLAGS_NODBG )
 145         p_new->i_flags |= OBJECT_FLAGS_NODBG;
 146     if( p_this->i_flags & OBJECT_FLAGS_QUIET )
 147         p_new->i_flags |= OBJECT_FLAGS_QUIET;
 148     if( p_this->i_flags & OBJECT_FLAGS_NOINTERACT )
 149         p_new->i_flags |= OBJECT_FLAGS_NOINTERACT;
 150
 151     p_priv->p_vars = calloc( sizeof( variable_t ), 16 );
 152
 153     if( !p_priv->p_vars )
 154     {
 155         if( i_type != VLC_OBJECT_GLOBAL )
 156             free( p_priv );
 157         return NULL;
 158     }
 159
 160     if( i_type == VLC_OBJECT_GLOBAL )
 161     {
 162         /* If i_type is global, then p_new is actually p_libvlc_global */
 163         libvlc_global_data_t *p_libvlc_global = (libvlc_global_data_t *)p_new;
 164         p_new->p_libvlc = NULL;
 165
 166         p_libvlc_global->i_counter = 0;
 167         p_new->i_object_id = 0;
 168
 169         p_libvlc_global->i_objects = 1;
 170         p_libvlc_global->pp_objects = malloc( sizeof(vlc_object_t *) );
 171         p_libvlc_global->pp_objects[0] = p_new;
 172         p_priv->b_attached = VLC_TRUE;
 173     }
 174     else
 175     {
 176         libvlc_global_data_t *p_libvlc_global = vlc_global();
 177         if( i_type == VLC_OBJECT_LIBVLC )
 178         {
 179             p_new->p_libvlc = (libvlc_int_t*)p_new;
 180             p_priv->b_attached = VLC_TRUE;
 181         }
 182         else
 183         {
 184             p_new->p_libvlc = p_this->p_libvlc;
 185         }
 186
 187         vlc_mutex_lock( &structure_lock );
 188
 189         p_libvlc_global->i_counter++;
 190         p_new->i_object_id = p_libvlc_global->i_counter;
 191
 192         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 193          * useless to try and recover anything if pp_objects gets smashed. */
 194         TAB_APPEND( p_libvlc_global->i_objects, p_libvlc_global->pp_objects,
 195                     p_new );
 196
 197         vlc_mutex_unlock( &structure_lock );
 198     }
 199
 200     p_priv->i_refcount = 1;
 201     p_priv->pf_destructor = kVLCDestructor;
 202     p_priv->b_thread = VLC_FALSE;
 203     p_new->p_parent = NULL;
 204     p_new->pp_children = NULL;
 205     p_new->i_children = 0;
 206
 207     p_new->p_private = NULL;
 208
 209     /* Initialize mutexes and condvars */
 210     vlc_mutex_init( p_new, &p_new->object_lock );
 211     vlc_cond_init( p_new, &p_new->object_wait );
 212     vlc_mutex_init( p_new, &p_priv->var_lock );
 213     vlc_spin_init( &p_priv->spin );
 214     p_priv->pipes[0] = p_priv->pipes[1] = -1;
 215
 216     if( i_type == VLC_OBJECT_GLOBAL )
 217     {
 218         vlc_mutex_init( p_new, &structure_lock );
 219     }
 220
 221     if( i_type == VLC_OBJECT_LIBVLC )
 222     {
 223         var_Create( p_new, "list", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 224         var_AddCallback( p_new, "list", DumpCommand, NULL );
 225         var_Create( p_new, "tree", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 226         var_AddCallback( p_new, "tree", DumpCommand, NULL );
 227         var_Create( p_new, "vars", VLC_VAR_STRING | VLC_VAR_ISCOMMAND );
 228         var_AddCallback( p_new, "vars", DumpCommand, NULL );
 229     }
 230
 231     return p_new;
 232 }
 233
 234
 235 /**
 236  * Allocates and initializes a vlc object.
 237  *
 238  * @param i_type known object type (all of them are negative integer values),
 239  *               or object byte size (always positive).
 240  *
 241  * @return the new object, or NULL on error.
 242  */
 243 void * __vlc_object_create( vlc_object_t *p_this, int i_type )
 244 {
 245     const char   * psz_type;
 246     size_t         i_size;
 247
 248     switch( i_type )
 249     {
 250         case VLC_OBJECT_GLOBAL:
 251             i_size = sizeof(libvlc_global_data_t);
 252             psz_type = "global";
 253             break;
 254         case VLC_OBJECT_LIBVLC:
 255             i_size = sizeof(libvlc_int_t);
 256             psz_type = "libvlc";
 257             break;
 258         case VLC_OBJECT_INTF:
 259             i_size = sizeof(intf_thread_t);
 260             psz_type = "interface";
 261             break;
 262         case VLC_OBJECT_DIALOGS:
 263             i_size = sizeof(intf_thread_t);
 264             psz_type = "dialogs";
 265             break;
 266         case VLC_OBJECT_PLAYLIST:
 267             i_size = sizeof(playlist_t);
 268             psz_type = "playlist";
 269             break;
 270         case VLC_OBJECT_SD:
 271             i_size = sizeof(services_discovery_t);
 272             psz_type = "services discovery";
 273             break;
 274         case VLC_OBJECT_INPUT:
 275             i_size = sizeof(input_thread_t);
 276             psz_type = "input";
 277             break;
 278         case VLC_OBJECT_DEMUX:
 279             i_size = sizeof(demux_t);
 280             psz_type = "demux";
 281             break;
 282         case VLC_OBJECT_ACCESS:
 283             i_size = sizeof(access_t);
 284             psz_type = "access";
 285             break;
 286         case VLC_OBJECT_DECODER:
 287             i_size = sizeof(decoder_t);
 288             psz_type = "decoder";
 289             break;
 290         case VLC_OBJECT_PACKETIZER:
 291             i_size = sizeof(decoder_t);
 292             psz_type = "packetizer";
 293             break;
 294         case VLC_OBJECT_ENCODER:
 295             i_size = sizeof(encoder_t);
 296             psz_type = "encoder";
 297             break;
 298         case VLC_OBJECT_FILTER:
 299             i_size = sizeof(filter_t);
 300             psz_type = "filter";
 301             break;
 302         case VLC_OBJECT_VOUT:
 303             i_size = sizeof(vout_thread_t);
 304             psz_type = "video output";
 305             break;
 306         case VLC_OBJECT_SPU:
 307             i_size = sizeof(spu_t);
 308             psz_type = "subpicture";
 309             break;
 310         case VLC_OBJECT_AOUT:
 311             i_size = sizeof(aout_instance_t);
 312             psz_type = "audio output";
 313             break;
 314         case VLC_OBJECT_SOUT:
 315             i_size = sizeof(sout_instance_t);
 316             psz_type = "stream output";
 317             break;
 318         case VLC_OBJECT_VLM:
 319             i_size = sizeof( vlm_t );
 320             psz_type = "vlm dameon";
 321             break;
 322         case VLC_OBJECT_XML:
 323             i_size = sizeof( xml_t );
 324             psz_type = "xml";
 325             break;
 326         case VLC_OBJECT_OPENGL:
 327             i_size = sizeof( vout_thread_t );
 328             psz_type = "opengl";
 329             break;
 330         case VLC_OBJECT_ANNOUNCE:
 331             i_size = sizeof( announce_handler_t );
 332             psz_type = "announce";
 333             break;
 334         case VLC_OBJECT_META_ENGINE:
 335             i_size = sizeof( meta_engine_t );
 336             psz_type = "meta engine";
 337             break;
 338         case VLC_OBJECT_OSDMENU:
 339             i_size = sizeof( osd_menu_t );
 340             psz_type = "osd menu";
 341             break;
 342         case VLC_OBJECT_INTERACTION:
 343             i_size = sizeof( interaction_t );
 344             psz_type = "interaction";
 345             break;
 346         default:
 347             i_size = i_type > (int)sizeof(vlc_object_t)
 348                          ? i_type : (int)sizeof(vlc_object_t);
 349             i_type = VLC_OBJECT_GENERIC;
 350             psz_type = "generic";
 351             break;
 352     }
 353
 354     return vlc_custom_create( p_this, i_size, i_type, psz_type );
 355 }
 356
 357
 358 /**
 359  ****************************************************************************
 360  * Set the destructor of a vlc object
 361  *
 362  * This function sets the destructor of the vlc object. It will be called
 363  * when the object is destroyed when the its refcount reaches 0.
 364  * (It is called by the internal function vlc_object_destroy())
 365  *****************************************************************************/
 366 void __vlc_object_set_destructor( vlc_object_t *p_this,
 367                                   vlc_destructor_t pf_destructor )
 368 {
 369     vlc_object_internals_t *p_priv = vlc_internals(p_this );
 370
 371     vlc_mutex_lock( &structure_lock );
 372     p_priv->pf_destructor = pf_destructor;
 373     vlc_mutex_unlock( &structure_lock );
 374 }
 375
 376 /**
 377  ****************************************************************************
 378  * Destroy a vlc object (Internal)
 379  *
 380  * This function destroys an object that has been previously allocated with
 381  * vlc_object_create. The object's refcount must be zero and it must not be
 382  * attached to other objects in any way.
 383  *****************************************************************************/
 384 static void vlc_object_destroy( vlc_object_t *p_this )
 385 {
 386     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 387
 388     /* Automatically detach the object from its parents */
 389     if( p_this->p_parent ) vlc_object_detach( p_this );
 390
 391
 392     /* Send a kill to the object's thread if applicable */
 393     vlc_object_kill( p_this );
 394
 395     /* If we are running on a thread, wait until it ends */
 396     if( p_priv->b_thread )
 397         vlc_thread_join( p_this );
 398
 399     /* Call the custom "subclass" destructor */
 400     if( p_priv->pf_destructor )
 401         p_priv->pf_destructor( p_this );
 402
 403     /* Sanity checks */
 404     if( p_this->i_children )
 405     {
 406         int i;
 407
 408         fprintf( stderr,
 409                  "ERROR: cannot delete object (%i, %s) with %d children\n",
 410                  p_this->i_object_id, p_this->psz_object_name,
 411                  p_this->i_children );
 412
 413         for( i = 0; i < p_this->i_children; i++ )
 414         {
 415             fprintf( stderr,
 416                      "ERROR: Remaining children object "
 417                      "(id:%i, type:%s, name:%s)\n",
 418                      p_this->pp_children[i]->i_object_id,
 419                      p_this->pp_children[i]->psz_object_type,
 420                      p_this->pp_children[i]->psz_object_name );
 421         }
 422         fflush(stderr);
 423         abort();
 424     }
 425
 426     /* Destroy the associated variables, starting from the end so that
 427      * no memmove calls have to be done. */
 428     while( p_priv->i_vars )
 429     {
 430         var_Destroy( p_this, p_priv->p_vars[p_priv->i_vars - 1].psz_name );
 431     }
 432
 433     free( p_priv->p_vars );
 434     vlc_mutex_destroy( &p_priv->var_lock );
 435
 436     free( p_this->psz_header );
 437
 438     if( p_this->i_object_type == VLC_OBJECT_GLOBAL )
 439     {
 440         libvlc_global_data_t *p_global = (libvlc_global_data_t *)p_this;
 441
 442         /* Test for leaks */
 443         if( p_global->i_objects > 0 )
 444         {
 445             int i;
 446             for( i = 0; i < p_global->i_objects; i++ )
 447             {
 448                 /* We are leaking this object */
 449                 fprintf( stderr,
 450                          "ERROR: leaking object (id:%i, type:%s, name:%s)\n",
 451                          p_global->pp_objects[i]->i_object_id,
 452                          p_global->pp_objects[i]->psz_object_type,
 453                          p_global->pp_objects[i]->psz_object_name );
 454                 fflush(stderr);
 455             }
 456             /* Strongly abort, cause we want these to be fixed */
 457             abort();
 458         }
 459
 460         /* We are the global object ... no need to lock. */
 461         free( p_global->pp_objects );
 462         p_global->pp_objects = NULL;
 463
 464         vlc_mutex_destroy( &structure_lock );
 465     }
 466
 467 #if defined(WIN32) || defined(UNDER_CE)
 468     /* if object has an associated thread, close it now */
 469     if( p_priv->thread_id.hThread )
 470        CloseHandle(p_priv->thread_id.hThread);
 471 #endif
 472
 473     vlc_mutex_destroy( &p_this->object_lock );
 474     vlc_cond_destroy( &p_this->object_wait );
 475     vlc_spin_destroy( &p_priv->spin );
 476     if( p_priv->pipes[1] != -1 )
 477         close( p_priv->pipes[1] );
 478     if( p_priv->pipes[0] != -1 )
 479         close( p_priv->pipes[0] );
 480
 481     /* global is not dynamically allocated by vlc_object_create */
 482     if( p_this->i_object_type != VLC_OBJECT_GLOBAL )
 483         free( p_priv );
 484 }
 485
 486
 487 /** Inter-object signaling */
 488
 489 void __vlc_object_lock( vlc_object_t *obj )
 490 {
 491     vlc_mutex_lock( &obj->object_lock );
 492 }
 493
 494 void __vlc_object_unlock( vlc_object_t *obj )
 495 {
 496     vlc_assert_locked( &obj->object_lock );
 497     vlc_mutex_unlock( &obj->object_lock );
 498 }
 499
 500 #ifdef WIN32
 501 # include <winsock2.h>
 502 # include <ws2tcpip.h>
 503
 504 /**
 505  * select()-able pipes emulated using Winsock
 506  */
 507 static int pipe (int fd[2])
 508 {
 509     SOCKADDR_IN addr;
 510     int addrlen = sizeof (addr);
 511
 512     SOCKET l = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP), a,
 513            c = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP);
 514     if ((l == INVALID_SOCKET) || (c == INVALID_SOCKET))
 515         goto error;
 516
 517     memset (&addr, 0, sizeof (addr));
 518     addr.sin_family = AF_INET;
 519     addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
 520     if (bind (l, (PSOCKADDR)&addr, sizeof (addr))
 521      || getsockname (l, (PSOCKADDR)&addr, &addrlen)
 522      || listen (l, 1)
 523      || connect (c, (PSOCKADDR)&addr, addrlen))
 524         goto error;
 525
 526     a = accept (l, NULL, NULL);
 527     if (a == INVALID_SOCKET)
 528         goto error;
 529
 530     closesocket (l);
 531     //shutdown (a, 0);
 532     //shutdown (c, 1);
 533     fd[0] = c;
 534     fd[1] = a;
 535     return 0;
 536
 537 error:
 538     if (l != INVALID_SOCKET)
 539         closesocket (l);
 540     if (c != INVALID_SOCKET)
 541         closesocket (c);
 542     return -1;
 543 }
 544
 545 #undef  read
 546 #define read( a, b, c )  recv (a, b, c, 0)
 547 #undef  write
 548 #define write( a, b, c ) send (a, b, c, 0)
 549 #undef  close
 550 #define close( a )       closesocket (a)
 551 #endif /* WIN32 */
 552
 553 /**
 554  * Returns the readable end of a pipe that becomes readable once termination
 555  * of the object is requested (vlc_object_kill()).
 556  * This can be used to wake-up out of a select() or poll() event loop, such
 557  * typically when doing network I/O.
 558  *
 559  * Note that the pipe will remain the same for the lifetime of the object.
 560  * DO NOT read the pipe nor close it yourself. Ever.
 561  *
 562  * @param obj object that would be "killed"
 563  * @return a readable pipe descriptor, or -1 on error.
 564  */
 565 int __vlc_object_waitpipe( vlc_object_t *obj )
 566 {
 567     int pfd[2] = { -1, -1 };
 568     struct vlc_object_internals_t *internals = obj->p_internals;
 569     vlc_bool_t killed = VLC_FALSE;
 570
 571     vlc_spin_lock (&internals->spin);
 572     if (internals->pipes[0] == -1)
 573     {
 574         /* This can only ever happen if someone killed us without locking: */
 575         assert (internals->pipes[1] == -1);
 576         vlc_spin_unlock (&internals->spin);
 577
 578         if (pipe (pfd))
 579             return -1;
 580
 581         vlc_spin_lock (&internals->spin);
 582         if (internals->pipes[0] == -1)
 583         {
 584             internals->pipes[0] = pfd[0];
 585             internals->pipes[1] = pfd[1];
 586             pfd[0] = pfd[1] = -1;
 587         }
 588         killed = obj->b_die;
 589     }
 590     vlc_spin_unlock (&internals->spin);
 591
 592     if (killed)
 593     {
 594         /* Race condition: vlc_object_kill() already invoked! */
 595         int fd;
 596
 597         vlc_spin_lock (&internals->spin);
 598         fd = internals->pipes[1];
 599         internals->pipes[1] = -1;
 600         vlc_spin_unlock (&internals->spin);
 601
 602         msg_Dbg (obj, "waitpipe: object already dying");
 603         if (fd != -1)
 604             close (fd);
 605     }
 606
 607     /* Race condition: two threads call pipe() - unlikely */
 608     if (pfd[0] != -1)
 609         close (pfd[0]);
 610     if (pfd[1] != -1)
 611         close (pfd[1]);
 612
 613     return internals->pipes[0];
 614 }
 615
 616
 617 /**
 618  * Waits for the object to be signaled (using vlc_object_signal()).
 619  * If the object already has a signal pending, this function will return
 620  * immediately. It is asserted that the caller holds the object lock.
 621  *
 622  * @return true if the object is dying and should terminate.
 623  */
 624 vlc_bool_t __vlc_object_wait( vlc_object_t *obj )
 625 {
 626     vlc_assert_locked( &obj->object_lock );
 627     vlc_cond_wait( &obj->object_wait, &obj->object_lock );
 628     return obj->b_die;
 629 }
 630
 631
 632 /**
 633  * Waits for the object to be signaled (using vlc_object_signal()), or for
 634  * a timer to expire.
 635  * If the object already has a signal pending, this function will return
 636  * immediately. It is asserted that the caller holds the object lock.
 637  *
 638  * @return negative if the object is dying and should terminate,
 639  * positive if the the object has been signaled but is not dying,
 640  * 0 if timeout has been reached.
 641  */
 642 int __vlc_object_timedwait( vlc_object_t *obj, mtime_t deadline )
 643 {
 644     int v;
 645
 646     vlc_assert_locked( &obj->object_lock );
 647     v = vlc_cond_timedwait( &obj->object_wait, &obj->object_lock, deadline );
 648     if( v == 0 ) /* signaled */
 649         return obj->b_die ? -1 : 1;
 650     return 0;
 651 }
 652
 653
 654 /**
 655  * Checks whether an object has been "killed".
 656  * The object lock must be held.
 657  *
 658  * Typical code for an object thread could be:
 659  *
 660    vlc_object_lock (self);
 661    ...initialization...
 662    while (vlc_object_alive (self))
 663    {
 664        ...preprocessing...
 665
 666        if (vlc_object_wait (self))
 667            continue;
 668
 669        ...postprocessing...
 670    }
 671    ...deinitialization...
 672    vlc_object_unlock (self);
 673  *
 674  *
 675  * @return true iff the object has not been killed yet
 676  */
 677 vlc_bool_t __vlc_object_alive( vlc_object_t *obj )
 678 {
 679     vlc_assert_locked( &obj->object_lock );
 680     return !obj->b_die;
 681 }
 682
 683
 684 /**
 685  * Signals an object for which the lock is held.
 686  */
 687 void __vlc_object_signal_unlocked( vlc_object_t *obj )
 688 {
 689     vlc_assert_locked (&obj->object_lock);
 690     vlc_cond_signal( &obj->object_wait );
 691 }
 692
 693
 694 /**
 695  * Requests termination of an object.
 696  * If the object is LibVLC, also request to terminate all its children.
 697  */
 698 void __vlc_object_kill( vlc_object_t *p_this )
 699 {
 700     struct vlc_object_internals_t *internals = p_this->p_internals;
 701     int fd;
 702
 703     vlc_mutex_lock( &p_this->object_lock );
 704     p_this->b_die = VLC_TRUE;
 705
 706     vlc_spin_lock (&internals->spin);
 707     fd = internals->pipes[1];
 708     internals->pipes[1] = -1;
 709     vlc_spin_unlock (&internals->spin);
 710
 711     if( fd != -1 )
 712     {
 713         msg_Dbg (p_this, "waitpipe: object killed");
 714         close (fd);
 715     }
 716
 717     if( p_this->i_object_type == VLC_OBJECT_LIBVLC )
 718         for( int i = 0; i < p_this->i_children ; i++ )
 719             vlc_object_kill( p_this->pp_children[i] );
 720
 721     vlc_object_signal_unlocked( p_this );
 722     vlc_mutex_unlock( &p_this->object_lock );
 723 }
 724
 725
 726 /**
 727  * find an object given its ID
 728  *
 729  * This function looks for the object whose i_object_id field is i_id. We
 730  * use a dichotomy so that lookups are in log2(n).
 731  *****************************************************************************/
 732 void * vlc_object_get( int i_id )
 733 {
 734     int i_max, i_middle;
 735     vlc_object_t **pp_objects;
 736     libvlc_global_data_t *p_libvlc_global = vlc_global();
 737
 738     vlc_mutex_lock( &structure_lock );
 739
 740     pp_objects = p_libvlc_global->pp_objects;
 741
 742     /* Perform our dichotomy */
 743     for( i_max = p_libvlc_global->i_objects - 1 ; ; )
 744     {
 745         i_middle = i_max / 2;
 746
 747         if( pp_objects[i_middle]->i_object_id > i_id )
 748         {
 749             i_max = i_middle;
 750         }
 751         else if( pp_objects[i_middle]->i_object_id < i_id )
 752         {
 753             if( i_middle )
 754             {
 755                 pp_objects += i_middle;
 756                 i_max -= i_middle;
 757             }
 758             else
 759             {
 760                 /* This happens when there are only two remaining objects */
 761                 if( pp_objects[i_middle+1]->i_object_id == i_id
 762                     && pp_objects[i_middle+1]->p_internals->i_refcount > 0 )
 763                 {
 764                     vlc_object_yield_locked( pp_objects[i_middle+1] );
 765                     vlc_mutex_unlock( &structure_lock );
 766                     return pp_objects[i_middle+1];
 767                 }
 768                 break;
 769             }
 770         }
 771         else if( pp_objects[i_middle]->p_internals->i_refcount > 0 )
 772         {
 773             vlc_object_yield_locked( pp_objects[i_middle] );
 774             vlc_mutex_unlock( &structure_lock );
 775             return pp_objects[i_middle];
 776         }
 777
 778         if( i_max == 0 )
 779         {
 780             /* this means that i_max == i_middle, and since we have already
 781              * tested pp_objects[i_middle]), p_found is properly set. */
 782             break;
 783         }
 784     }
 785
 786     vlc_mutex_unlock( &structure_lock );
 787     return NULL;
 788 }
 789
 790 /**
 791  ****************************************************************************
 792  * find a typed object and increment its refcount
 793  *****************************************************************************
 794  * This function recursively looks for a given object type. i_mode can be one
 795  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 796  *****************************************************************************/
 797 void * __vlc_object_find( vlc_object_t *p_this, int i_type, int i_mode )
 798 {
 799     vlc_object_t *p_found;
 800
 801     vlc_mutex_lock( &structure_lock );
 802
 803     /* If we are of the requested type ourselves, don't look further */
 804     if( !(i_mode & FIND_STRICT) && p_this->i_object_type == i_type
 805         && p_this->p_internals->i_refcount > 0 )
 806     {
 807         vlc_object_yield_locked( p_this );
 808         vlc_mutex_unlock( &structure_lock );
 809         return p_this;
 810     }
 811
 812     /* Otherwise, recursively look for the object */
 813     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 814     {
 815         vlc_object_t *p_root = p_this;
 816
 817         /* Find the root */
 818         while( p_root->p_parent != NULL &&
 819                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 820         {
 821             p_root = p_root->p_parent;
 822         }
 823
 824         p_found = FindObject( p_root, i_type, (i_mode & ~0x000f)|FIND_CHILD );
 825         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 826         {
 827             p_found = FindObject( VLC_OBJECT( p_this->p_libvlc ),
 828                                   i_type, (i_mode & ~0x000f)|FIND_CHILD );
 829         }
 830     }
 831     else
 832     {
 833         p_found = FindObject( p_this, i_type, i_mode );
 834     }
 835
 836     vlc_mutex_unlock( &structure_lock );
 837
 838     return p_found;
 839 }
 840
 841 /**
 842  ****************************************************************************
 843  * find a named object and increment its refcount
 844  *****************************************************************************
 845  * This function recursively looks for a given object name. i_mode can be one
 846  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
 847  *****************************************************************************/
 848 void * __vlc_object_find_name( vlc_object_t *p_this, const char *psz_name,
 849                                int i_mode )
 850 {
 851     vlc_object_t *p_found;
 852
 853     vlc_mutex_lock( &structure_lock );
 854
 855     /* Avoid obvious freed object uses */
 856     assert( p_this->p_internals->i_refcount > 0 );
 857
 858     /* If have the requested name ourselves, don't look further */
 859     if( !(i_mode & FIND_STRICT)
 860         && p_this->psz_object_name
 861         && !strcmp( p_this->psz_object_name, psz_name )
 862         && p_this->p_internals->i_refcount > 0 )
 863     {
 864         vlc_object_yield_locked( p_this );
 865         vlc_mutex_unlock( &structure_lock );
 866         return p_this;
 867     }
 868
 869     /* Otherwise, recursively look for the object */
 870     if( (i_mode & 0x000f) == FIND_ANYWHERE )
 871     {
 872         vlc_object_t *p_root = p_this;
 873
 874         /* Find the root */
 875         while( p_root->p_parent != NULL &&
 876                p_root != VLC_OBJECT( p_this->p_libvlc ) )
 877         {
 878             p_root = p_root->p_parent;
 879         }
 880
 881         p_found = FindObjectName( p_root, psz_name,
 882                                  (i_mode & ~0x000f)|FIND_CHILD );
 883         if( p_found == NULL && p_root != VLC_OBJECT( p_this->p_libvlc ) )
 884         {
 885             p_found = FindObjectName( VLC_OBJECT( p_this->p_libvlc ),
 886                                       psz_name, (i_mode & ~0x000f)|FIND_CHILD );
 887         }
 888     }
 889     else
 890     {
 891         p_found = FindObjectName( p_this, psz_name, i_mode );
 892     }
 893
 894     vlc_mutex_unlock( &structure_lock );
 895
 896     return p_found;
 897 }
 898
 899 /**
 900  ****************************************************************************
 901  * increment an object refcount
 902  *****************************************************************************/
 903
 904 /* When the structure_lock is locked */
 905 static void vlc_object_yield_locked( vlc_object_t *p_this )
 906 {
 907     vlc_assert_locked (&structure_lock);
 908
 909     /* Avoid obvious freed object uses */
 910     assert( p_this->p_internals->i_refcount > 0 );
 911
 912     /* Increment the counter */
 913     p_this->p_internals->i_refcount++;
 914 }
 915
 916 /* Public function */
 917 void __vlc_object_yield( vlc_object_t *p_this )
 918 {
 919     vlc_mutex_lock( &structure_lock );
 920     vlc_object_yield_locked( p_this );
 921     vlc_mutex_unlock( &structure_lock );
 922 }
 923
 924
 925 /*****************************************************************************
 926  * decrement an object refcount
 927  * And destroy the object if its refcount reach zero.
 928  *****************************************************************************/
 929 void __vlc_object_release( vlc_object_t *p_this )
 930 {
 931     vlc_bool_t b_should_destroy;
 932
 933     vlc_mutex_lock( &structure_lock );
 934
 935     assert( p_this->p_internals->i_refcount > 0 );
 936     p_this->p_internals->i_refcount--;
 937     b_should_destroy = (p_this->p_internals->i_refcount == 0);
 938
 939     if( b_should_destroy )
 940     {
 941         /* Make sure this object can't be obtained via vlc_find_object now that
 942          * it is freed */
 943         libvlc_global_data_t *p_libvlc_global = vlc_global();
 944         int i_index;
 945
 946         /* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
 947          * useless to try and recover anything if pp_objects gets smashed. */
 948         i_index = FindIndex( p_this, p_libvlc_global->pp_objects,
 949                              p_libvlc_global->i_objects );
 950         REMOVE_ELEM( p_libvlc_global->pp_objects,
 951                      p_libvlc_global->i_objects, i_index );
 952     }
 953
 954     vlc_mutex_unlock( &structure_lock );
 955
 956     if( b_should_destroy )
 957         vlc_object_destroy( p_this );
 958 }
 959
 960 /**
 961  ****************************************************************************
 962  * attach object to a parent object
 963  *****************************************************************************
 964  * This function sets p_this as a child of p_parent, and p_parent as a parent
 965  * of p_this. This link can be undone using vlc_object_detach.
 966  *****************************************************************************/
 967 void __vlc_object_attach( vlc_object_t *p_this, vlc_object_t *p_parent )
 968 {
 969     if( !p_this ) return;
 970
 971     vlc_mutex_lock( &structure_lock );
 972
 973     /* Avoid obvious freed object uses */
 974     assert( p_this->p_internals->i_refcount > 0 );
 975
 976     /* Attach the parent to its child */
 977     p_this->p_parent = p_parent;
 978
 979     /* Attach the child to its parent */
 980     INSERT_ELEM( p_parent->pp_children, p_parent->i_children,
 981                  p_parent->i_children, p_this );
 982
 983     /* Climb up the tree to see whether we are connected with the root */
 984     if( p_parent->p_internals->b_attached )
 985     {
 986         SetAttachment( p_this, VLC_TRUE );
 987     }
 988
 989     vlc_mutex_unlock( &structure_lock );
 990 }
 991
 992 /**
 993  ****************************************************************************
 994  * detach object from its parent
 995  *****************************************************************************
 996  * This function removes all links between an object and its parent.
 997  *****************************************************************************/
 998 void __vlc_object_detach( vlc_object_t *p_this )
 999 {
1000     if( !p_this ) return;
1001
1002     vlc_mutex_lock( &structure_lock );
1003
1004     if( !p_this->p_parent )
1005     {
1006         msg_Err( p_this, "object is not attached" );
1007         vlc_mutex_unlock( &structure_lock );
1008         return;
1009     }
1010
1011     /* Climb up the tree to see whether we are connected with the root */
1012     if( p_this->p_parent->p_internals->b_attached )
1013     {
1014         SetAttachment( p_this, VLC_FALSE );
1015     }
1016
1017     DetachObject( p_this );
1018     vlc_mutex_unlock( &structure_lock );
1019     p_this = NULL;
1020 }
1021
1022 /**
1023  ****************************************************************************
1024  * find a list typed objects and increment their refcount
1025  *****************************************************************************
1026  * This function recursively looks for a given object type. i_mode can be one
1027  * of FIND_PARENT, FIND_CHILD or FIND_ANYWHERE.
1028  *****************************************************************************/
1029 vlc_list_t * __vlc_list_find( vlc_object_t *p_this, int i_type, int i_mode )
1030 {
1031     vlc_list_t *p_list;
1032     vlc_object_t **pp_current, **pp_end;
1033     int i_count = 0, i_index = 0;
1034     libvlc_global_data_t *p_libvlc_global = vlc_global();
1035
1036     vlc_mutex_lock( &structure_lock );
1037
1038     /* Look for the objects */
1039     switch( i_mode & 0x000f )
1040     {
1041     case FIND_ANYWHERE:
1042         pp_current = p_libvlc_global->pp_objects;
1043         pp_end = pp_current + p_libvlc_global->i_objects;
1044
1045         for( ; pp_current < pp_end ; pp_current++ )
1046         {
1047             if( (*pp_current)->p_internals->b_attached
1048                  && (*pp_current)->i_object_type == i_type )
1049             {
1050                 i_count++;
1051             }
1052         }
1053
1054         p_list = NewList( i_count );
1055         pp_current = p_libvlc_global->pp_objects;
1056
1057         for( ; pp_current < pp_end ; pp_current++ )
1058         {
1059             if( (*pp_current)->p_internals->b_attached
1060                  && (*pp_current)->i_object_type == i_type )
1061             {
1062                 ListReplace( p_list, *pp_current, i_index );
1063                 if( i_index < i_count ) i_index++;
1064             }
1065         }
1066     break;
1067
1068     case FIND_CHILD:
1069         i_count = CountChildren( p_this, i_type );
1070         p_list = NewList( i_count );
1071
1072         /* Check allocation was successful */
1073         if( p_list->i_count != i_count )
1074         {
1075             msg_Err( p_this, "list allocation failed!" );
1076             p_list->i_count = 0;
1077             break;
1078         }
1079
1080         p_list->i_count = 0;
1081         ListChildren( p_list, p_this, i_type );
1082         break;
1083
1084     default:
1085         msg_Err( p_this, "unimplemented!" );
1086         p_list = NewList( 0 );
1087         break;
1088     }
1089
1090     vlc_mutex_unlock( &structure_lock );
1091
1092     return p_list;
1093 }
1094
1095 /*****************************************************************************
1096  * DumpCommand: print the current vlc structure
1097  *****************************************************************************
1098  * This function prints either an ASCII tree showing the connections between
1099  * vlc objects, and additional information such as their refcount, thread ID,
1100  * etc. (command "tree"), or the same data as a simple list (command "list").
1101  *****************************************************************************/
1102 static int DumpCommand( vlc_object_t *p_this, char const *psz_cmd,
1103                         vlc_value_t oldval, vlc_value_t newval, void *p_data )
1104 {
1105     libvlc_global_data_t *p_libvlc_global = vlc_global();
1106
1107     (void)oldval; (void)p_data;
1108     if( *psz_cmd == 'l' )
1109     {
1110         vlc_mutex_lock( &structure_lock );
1111
1112         vlc_object_t **pp_current, **pp_end;
1113
1114         pp_current = p_libvlc_global->pp_objects;
1115         pp_end = pp_current + p_libvlc_global->i_objects;
1116
1117         for( ; pp_current < pp_end ; pp_current++ )
1118         {
1119             if( (*pp_current)->p_internals->b_attached )
1120             {
1121                 PrintObject( *pp_current, "" );
1122             }
1123             else
1124             {
1125                 printf( " o %.8i %s (not attached)\n",
1126                         (*pp_current)->i_object_id,
1127                         (*pp_current)->psz_object_type );
1128             }
1129         }
1130
1131         vlc_mutex_unlock( &structure_lock );
1132     }
1133     else
1134     {
1135         vlc_object_t *p_object = NULL;
1136
1137         if( *newval.psz_string )
1138         {
1139             char *end;
1140             int i_id = strtol( newval.psz_string, &end, 0 );
1141             if( end != newval.psz_string )
1142                 p_object = vlc_object_get( i_id );
1143             else
1144             {
1145                 /* try using the object's name to find it */
1146                 vlc_object_t *p_libvlc = vlc_object_get( 1 );
1147                 if( p_libvlc )
1148                 {
1149                     /* Look in p_libvlc's children tree */
1150                     p_object = vlc_object_find_name( p_libvlc,
1151                                                      newval.psz_string,
1152                                                      FIND_CHILD );
1153                     vlc_object_release( p_libvlc );
1154                 }
1155                 if( !p_object )
1156                 {
1157                     /* If it's not in libvlc, look in libvlc_global (== p_this) */
1158                     p_object = vlc_object_find_name( p_this,
1159                                                      newval.psz_string,
1160                                                      FIND_CHILD );
1161                 }
1162             }
1163
1164             if( !p_object )
1165             {
1166                 return VLC_ENOOBJ;
1167             }
1168         }
1169
1170         vlc_mutex_lock( &structure_lock );
1171
1172         if( *psz_cmd == 't' )
1173         {
1174             char psz_foo[2 * MAX_DUMPSTRUCTURE_DEPTH + 1];
1175
1176             if( !p_object )
1177                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1178
1179             psz_foo[0] = '|';
1180             DumpStructure( p_object, 0, psz_foo );
1181         }
1182         else if( *psz_cmd == 'v' )
1183         {
1184             int i;
1185
1186             if( !p_object )
1187                 p_object = p_this->p_libvlc ? VLC_OBJECT(p_this->p_libvlc) : p_this;
1188
1189             PrintObject( p_object, "" );
1190
1191             if( !p_object->p_internals->i_vars )
1192                 printf( " `-o No variables\n" );
1193             for( i = 0; i < p_object->p_internals->i_vars; i++ )
1194             {
1195                 variable_t *p_var = p_object->p_internals->p_vars + i;
1196
1197                 const char *psz_type = "unknown";
1198                 switch( p_var->i_type & VLC_VAR_TYPE )
1199                 {
1200 #define MYCASE( type, nice )                \
1201                     case VLC_VAR_ ## type:  \
1202                         psz_type = nice;    \
1203                         break;
1204                     MYCASE( VOID, "void" );
1205                     MYCASE( BOOL, "bool" );
1206                     MYCASE( INTEGER, "integer" );
1207                     MYCASE( HOTKEY, "hotkey" );
1208                     MYCASE( STRING, "string" );
1209                     MYCASE( MODULE, "module" );
1210                     MYCASE( FILE, "file" );
1211                     MYCASE( DIRECTORY, "directory" );
1212                     MYCASE( VARIABLE, "variable" );
1213                     MYCASE( FLOAT, "float" );
1214                     MYCASE( TIME, "time" );
1215                     MYCASE( ADDRESS, "address" );
1216                     MYCASE( MUTEX, "mutex" );
1217                     MYCASE( LIST, "list" );
1218 #undef MYCASE
1219                 }
1220                 printf( " %c-o \"%s\" (%s",
1221                         i + 1 == p_object->p_internals->i_vars ? '`' : '|',
1222                         p_var->psz_name, psz_type );
1223                 if( p_var->psz_text )
1224                     printf( ", %s", p_var->psz_text );
1225                 printf( ")" );
1226                 if( p_var->i_type & VLC_VAR_ISCOMMAND )
1227                     printf( ", command" );
1228                 if( p_var->i_entries )
1229                     printf( ", %d callbacks", p_var->i_entries );
1230                 switch( p_var->i_type & 0x00f0 )
1231                 {
1232                     case VLC_VAR_VOID:
1233                     case VLC_VAR_MUTEX:
1234                         break;
1235                     case VLC_VAR_BOOL:
1236                         printf( ": %s", p_var->val.b_bool ? "true" : "false" );
1237                         break;
1238                     case VLC_VAR_INTEGER:
1239                         printf( ": %d", p_var->val.i_int );
1240                         break;
1241                     case VLC_VAR_STRING:
1242                         printf( ": \"%s\"", p_var->val.psz_string );
1243                         break;
1244                     case VLC_VAR_FLOAT:
1245                         printf( ": %f", p_var->val.f_float );
1246                         break;
1247                     case VLC_VAR_TIME:
1248                         printf( ": " I64Fi, (int64_t)p_var->val.i_time );
1249                         break;
1250                     case VLC_VAR_ADDRESS:
1251                         printf( ": %p", p_var->val.p_address );
1252                         break;
1253                     case VLC_VAR_LIST:
1254                         printf( ": TODO" );
1255                         break;
1256                 }
1257                 printf( "\n" );
1258             }
1259         }
1260
1261         vlc_mutex_unlock( &structure_lock );
1262
1263         if( *newval.psz_string )
1264         {
1265             vlc_object_release( p_object );
1266         }
1267     }
1268
1269     return VLC_SUCCESS;
1270 }
1271
1272 /*****************************************************************************
1273  * vlc_list_release: free a list previously allocated by vlc_list_find
1274  *****************************************************************************
1275  * This function decreases the refcount of all objects in the list and
1276  * frees the list.
1277  *****************************************************************************/
1278 void vlc_list_release( vlc_list_t *p_list )
1279 {
1280     int i_index;
1281
1282     for( i_index = 0; i_index < p_list->i_count; i_index++ )
1283     {
1284         vlc_object_release( p_list->p_values[i_index].p_object );
1285     }
1286
1287     free( p_list->p_values );
1288     free( p_list );
1289 }
1290
1291 /* Following functions are local */
1292
1293 /*****************************************************************************
1294  * FindIndex: find the index of an object in an array of objects
1295  *****************************************************************************
1296  * This function assumes that p_this can be found in pp_objects. It will not
1297  * crash if p_this cannot be found, but will return a wrong value. It is your
1298  * duty to check the return value if you are not certain that the object could
1299  * be found for sure.
1300  *****************************************************************************/
1301 static int FindIndex( vlc_object_t *p_this,
1302                       vlc_object_t **pp_objects, int i_count )
1303 {
1304     int i_middle = i_count / 2;
1305
1306     if( i_count == 0 )
1307     {
1308         return 0;
1309     }
1310
1311     if( pp_objects[i_middle] == p_this )
1312     {
1313         return i_middle;
1314     }
1315
1316     if( i_count == 1 )
1317     {
1318         return 0;
1319     }
1320
1321     /* We take advantage of the sorted array */
1322     if( pp_objects[i_middle]->i_object_id < p_this->i_object_id )
1323     {
1324         return i_middle + FindIndex( p_this, pp_objects + i_middle,
1325                                              i_count - i_middle );
1326     }
1327     else
1328     {
1329         return FindIndex( p_this, pp_objects, i_middle );
1330     }
1331 }
1332
1333 static vlc_object_t * FindObject( vlc_object_t *p_this, int i_type, int i_mode )
1334 {
1335     int i;
1336     vlc_object_t *p_tmp;
1337
1338     switch( i_mode & 0x000f )
1339     {
1340     case FIND_PARENT:
1341         p_tmp = p_this->p_parent;
1342         if( p_tmp )
1343         {
1344             if( p_tmp->i_object_type == i_type
1345                 && p_tmp->p_internals->i_refcount > 0 )
1346             {
1347                 vlc_object_yield_locked( p_tmp );
1348                 return p_tmp;
1349             }
1350             else
1351             {
1352                 return FindObject( p_tmp, i_type, i_mode );
1353             }
1354         }
1355         break;
1356
1357     case FIND_CHILD:
1358         for( i = p_this->i_children; i--; )
1359         {
1360             p_tmp = p_this->pp_children[i];
1361             if( p_tmp->i_object_type == i_type
1362                 && p_tmp->p_internals->i_refcount > 0 )
1363             {
1364                 vlc_object_yield_locked( p_tmp );
1365                 return p_tmp;
1366             }
1367             else if( p_tmp->i_children )
1368             {
1369                 p_tmp = FindObject( p_tmp, i_type, i_mode );
1370                 if( p_tmp )
1371                 {
1372                     return p_tmp;
1373                 }
1374             }
1375         }
1376         break;
1377
1378     case FIND_ANYWHERE:
1379         /* Handled in vlc_object_find */
1380         break;
1381     }
1382
1383     return NULL;
1384 }
1385
1386 static vlc_object_t * FindObjectName( vlc_object_t *p_this,
1387                                       const char *psz_name,
1388                                       int i_mode )
1389 {
1390     int i;
1391     vlc_object_t *p_tmp;
1392
1393     switch( i_mode & 0x000f )
1394     {
1395     case FIND_PARENT:
1396         p_tmp = p_this->p_parent;
1397         if( p_tmp )
1398         {
1399             if( p_tmp->psz_object_name
1400                 && !strcmp( p_tmp->psz_object_name, psz_name )
1401                 && p_tmp->p_internals->i_refcount > 0 )
1402             {
1403                 vlc_object_yield_locked( p_tmp );
1404                 return p_tmp;
1405             }
1406             else
1407             {
1408                 return FindObjectName( p_tmp, psz_name, i_mode );
1409             }
1410         }
1411         break;
1412
1413     case FIND_CHILD:
1414         for( i = p_this->i_children; i--; )
1415         {
1416             p_tmp = p_this->pp_children[i];
1417             if( p_tmp->psz_object_name
1418                 && !strcmp( p_tmp->psz_object_name, psz_name )
1419                 && p_tmp->p_internals->i_refcount > 0 )
1420             {
1421                 vlc_object_yield_locked( p_tmp );
1422                 return p_tmp;
1423             }
1424             else if( p_tmp->i_children )
1425             {
1426                 p_tmp = FindObjectName( p_tmp, psz_name, i_mode );
1427                 if( p_tmp )
1428                 {
1429                     return p_tmp;
1430                 }
1431             }
1432         }
1433         break;
1434
1435     case FIND_ANYWHERE:
1436         /* Handled in vlc_object_find */
1437         break;
1438     }
1439
1440     return NULL;
1441 }
1442
1443 static void DetachObject( vlc_object_t *p_this )
1444 {
1445     vlc_object_t *p_parent = p_this->p_parent;
1446     int i_index, i;
1447
1448     /* Remove p_this's parent */
1449     p_this->p_parent = NULL;
1450
1451     /* Remove all of p_parent's children which are p_this */
1452     for( i_index = p_parent->i_children ; i_index-- ; )
1453     {
1454         if( p_parent->pp_children[i_index] == p_this )
1455         {
1456             p_parent->i_children--;
1457             for( i = i_index ; i < p_parent->i_children ; i++ )
1458             {
1459                 p_parent->pp_children[i] = p_parent->pp_children[i+1];
1460             }
1461         }
1462     }
1463
1464     if( p_parent->i_children )
1465     {
1466         p_parent->pp_children = (vlc_object_t **)realloc( p_parent->pp_children,
1467                                p_parent->i_children * sizeof(vlc_object_t *) );
1468     }
1469     else
1470     {
1471         free( p_parent->pp_children );
1472         p_parent->pp_children = NULL;
1473     }
1474 }
1475
1476 /*****************************************************************************
1477  * SetAttachment: recursively set the b_attached flag of a subtree.
1478  *****************************************************************************
1479  * This function is used by the attach and detach functions to propagate
1480  * the b_attached flag in a subtree.
1481  *****************************************************************************/
1482 static void SetAttachment( vlc_object_t *p_this, vlc_bool_t b_attached )
1483 {
1484     int i_index;
1485
1486     for( i_index = p_this->i_children ; i_index-- ; )
1487     {
1488         SetAttachment( p_this->pp_children[i_index], b_attached );
1489     }
1490
1491     p_this->p_internals->b_attached = b_attached;
1492 }
1493
1494 static void PrintObject( vlc_object_t *p_this, const char *psz_prefix )
1495 {
1496     char psz_children[20], psz_refcount[20], psz_thread[30], psz_name[50],
1497          psz_parent[20];
1498
1499     psz_name[0] = '\0';
1500     if( p_this->psz_object_name )
1501     {
1502         snprintf( psz_name, 49, " \"%s\"", p_this->psz_object_name );
1503         if( psz_name[48] )
1504             psz_name[48] = '\"';
1505     }
1506
1507     psz_children[0] = '\0';
1508     switch( p_this->i_children )
1509     {
1510         case 0:
1511             break;
1512         case 1:
1513             strcpy( psz_children, ", 1 child" );
1514             break;
1515         default:
1516             snprintf( psz_children, 19, ", %i children", p_this->i_children );
1517             break;
1518     }
1519
1520     psz_refcount[0] = '\0';
1521     if( p_this->p_internals->i_refcount > 0 )
1522         snprintf( psz_refcount, 19, ", refcount %u",
1523                   p_this->p_internals->i_refcount );
1524
1525     psz_thread[0] = '\0';
1526     if( p_this->p_internals->b_thread )
1527         snprintf( psz_thread, 29, " (thread %u)",
1528 #if defined(WIN32) || defined(UNDER_CE)
1529                   (unsigned)p_this->p_internals->thread_id.id );
1530 #else
1531                   (unsigned)p_this->p_internals->thread_id );
1532 #endif
1533
1534     psz_parent[0] = '\0';
1535     if( p_this->p_parent )
1536         snprintf( psz_parent, 19, ", parent %i", p_this->p_parent->i_object_id );
1537
1538     printf( " %so %.8i %s%s%s%s%s%s\n", psz_prefix,
1539             p_this->i_object_id, p_this->psz_object_type,
1540             psz_name, psz_thread, psz_refcount, psz_children,
1541             psz_parent );
1542 }
1543
1544 static void DumpStructure( vlc_object_t *p_this, int i_level, char *psz_foo )
1545 {
1546     int i;
1547     char i_back = psz_foo[i_level];
1548     psz_foo[i_level] = '\0';
1549
1550     PrintObject( p_this, psz_foo );
1551
1552     psz_foo[i_level] = i_back;
1553
1554     if( i_level / 2 >= MAX_DUMPSTRUCTURE_DEPTH )
1555     {
1556         msg_Warn( p_this, "structure tree is too deep" );
1557         return;
1558     }
1559
1560     for( i = 0 ; i < p_this->i_children ; i++ )
1561     {
1562         if( i_level )
1563         {
1564             psz_foo[i_level-1] = ' ';
1565
1566             if( psz_foo[i_level-2] == '`' )
1567             {
1568                 psz_foo[i_level-2] = ' ';
1569             }
1570         }
1571
1572         if( i == p_this->i_children - 1 )
1573         {
1574             psz_foo[i_level] = '`';
1575         }
1576         else
1577         {
1578             psz_foo[i_level] = '|';
1579         }
1580
1581         psz_foo[i_level+1] = '-';
1582         psz_foo[i_level+2] = '\0';
1583
1584         DumpStructure( p_this->pp_children[i], i_level + 2, psz_foo );
1585     }
1586 }
1587
1588 static vlc_list_t * NewList( int i_count )
1589 {
1590     vlc_list_t * p_list = (vlc_list_t *)malloc( sizeof( vlc_list_t ) );
1591     if( p_list == NULL )
1592     {
1593         return NULL;
1594     }
1595
1596     p_list->i_count = i_count;
1597
1598     if( i_count == 0 )
1599     {
1600         p_list->p_values = NULL;
1601         return p_list;
1602     }
1603
1604     p_list->p_values = malloc( i_count * sizeof( vlc_value_t ) );
1605     if( p_list->p_values == NULL )
1606     {
1607         p_list->i_count = 0;
1608         return p_list;
1609     }
1610
1611     return p_list;
1612 }
1613
1614 static void ListReplace( vlc_list_t *p_list, vlc_object_t *p_object,
1615                          int i_index )
1616 {
1617     if( p_list == NULL || i_index >= p_list->i_count )
1618     {
1619         return;
1620     }
1621
1622     vlc_object_yield_locked( p_object );
1623
1624     p_list->p_values[i_index].p_object = p_object;
1625
1626     return;
1627 }
1628
1629 /*static void ListAppend( vlc_list_t *p_list, vlc_object_t *p_object )
1630 {
1631     if( p_list == NULL )
1632     {
1633         return;
1634     }
1635
1636     p_list->p_values = realloc( p_list->p_values, (p_list->i_count + 1)
1637                                 * sizeof( vlc_value_t ) );
1638     if( p_list->p_values == NULL )
1639     {
1640         p_list->i_count = 0;
1641         return;
1642     }
1643
1644     vlc_object_yield_locked( p_object );
1645
1646     p_list->p_values[p_list->i_count].p_object = p_object;
1647     p_list->i_count++;
1648
1649     return;
1650 }*/
1651
1652 static int CountChildren( vlc_object_t *p_this, int i_type )
1653 {
1654     vlc_object_t *p_tmp;
1655     int i, i_count = 0;
1656
1657     for( i = 0; i < p_this->i_children; i++ )
1658     {
1659         p_tmp = p_this->pp_children[i];
1660
1661         if( p_tmp->i_object_type == i_type )
1662         {
1663             i_count++;
1664         }
1665
1666         if( p_tmp->i_children )
1667         {
1668             i_count += CountChildren( p_tmp, i_type );
1669         }
1670     }
1671
1672     return i_count;
1673 }
1674
1675 static void ListChildren( vlc_list_t *p_list, vlc_object_t *p_this, int i_type )
1676 {
1677     vlc_object_t *p_tmp;
1678     int i;
1679
1680     for( i = 0; i < p_this->i_children; i++ )
1681     {
1682         p_tmp = p_this->pp_children[i];
1683
1684         if( p_tmp->i_object_type == i_type )
1685         {
1686             ListReplace( p_list, p_tmp, p_list->i_count++ );
1687         }
1688
1689         if( p_tmp->i_children )
1690         {
1691             ListChildren( p_list, p_tmp, i_type );
1692         }
1693     }
1694 }