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vlc-2-2
Commit 0d37c5b1 authored by Rémi Denis-Courmont's avatar Rémi Denis-Courmont
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Use a doubly-linked list for objects instead of a flat table 

Speeds up object creation and deletion, slows down vlc_object_get (which
you should not use anyway, remember), makes no difference for the rest
parent 620675d9
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Showing with 38 additions and 122 deletions
src/libvlc.h
View file @ 0d37c5b1
......@@ -149,8 +149,6 @@ typedef struct libvlc_global_data_t
/* Object structure data */
int i_counter; ///< object counter
int i_objects; ///< Attached objects count
vlc_object_t ** pp_objects; ///< Array of all objects
module_bank_t * p_module_bank; ///< The module bank
......@@ -184,6 +182,8 @@ struct vlc_object_internals_t
unsigned i_refcount;
vlc_destructor_t pf_destructor;
/* Objects tree structure */
vlc_object_t *prev, *next;
vlc_object_t **pp_children;
int i_children;
};
......
src/misc/objects.c
View file @ 0d37c5b1
......@@ -72,7 +72,6 @@ static vlc_object_t * FindObject ( vlc_object_t *, int, int );
static vlc_object_t * FindObjectName( vlc_object_t *, const char *, int );
static void PrintObject ( vlc_object_t *, const char * );
static void DumpStructure ( vlc_object_t *, int, char * );
static int FindIndex ( vlc_object_t *, vlc_object_t **, int );
static vlc_list_t * NewList ( int );
static void ListReplace ( vlc_list_t *, vlc_object_t *, int );
......@@ -141,8 +140,7 @@ void *vlc_custom_create( vlc_object_t *p_this, size_t i_size,
p_new->p_libvlc = NULL;
p_libvlc_global->i_counter = 0;
p_libvlc_global->i_objects = 0;
p_libvlc_global->pp_objects = NULL;
p_priv->next = p_priv->prev = p_new;
vlc_mutex_init( &structure_lock );
}
else
......@@ -171,12 +169,12 @@ void *vlc_custom_create( vlc_object_t *p_this, size_t i_size,
vlc_spin_init( &p_priv->spin );
p_priv->pipes[0] = p_priv->pipes[1] = -1;
p_priv->next = VLC_OBJECT (p_libvlc_global);
vlc_mutex_lock( &structure_lock );
p_priv->prev = vlc_internals (p_libvlc_global)->prev;
vlc_internals (p_libvlc_global)->prev = p_new;
vlc_internals (p_priv->prev)->next = p_new;
p_new->i_object_id = p_libvlc_global->i_counter++;
/* Wooohaa! If *this* fails, we're in serious trouble! Anyway it's
* useless to try and recover anything if pp_objects gets smashed. */
TAB_APPEND( p_libvlc_global->i_objects, p_libvlc_global->pp_objects,
p_new );
vlc_mutex_unlock( &structure_lock );
if( i_type == VLC_OBJECT_LIBVLC )
......@@ -340,36 +338,30 @@ static void vlc_object_destroy( vlc_object_t *p_this )
#ifndef NDEBUG
assert( p_global == vlc_global() );
/* Test for leaks */
if( p_global->i_objects > 0 )
for( vlc_object_t *leaked = p_priv->next;
leaked != p_this;
leaked = vlc_internals (leaked)->next )
{
int i;
for( i = 0; i < p_global->i_objects; i++ )
{
/* We are leaking this object */
fprintf( stderr,
"ERROR: leaking object (id:%i, type:%s, name:%s)\n",
p_global->pp_objects[i]->i_object_id,
p_global->pp_objects[i]->psz_object_type,
p_global->pp_objects[i]->psz_object_name );
/* Dump libvlc object to ease debugging */
vlc_object_dump( p_global->pp_objects[i] );
fflush(stderr);
}
/* We are leaking this object */
fprintf( stderr,
"ERROR: leaking object (id:%i, type:%s, name:%s)\n",
leaked->i_object_id, leaked->psz_object_type,
leaked->psz_object_name );
/* Dump libvlc object to ease debugging */
vlc_object_dump( leaked );
fflush(stderr);
}
if( p_priv->next != p_this )
{
/* Dump libvlc object to ease debugging */
vlc_object_dump( p_this );
/* Strongly abort, cause we want these to be fixed */
abort();
}
#endif
/* We are the global object ... no need to lock. */
free( p_global->pp_objects );
p_global->pp_objects = NULL;
vlc_mutex_destroy( &structure_lock );
}
......@@ -644,47 +636,19 @@ void __vlc_object_kill( vlc_object_t *p_this )
*/
void * vlc_object_get( int i_id )
{
int i_max, i_middle;
vlc_object_t **pp_objects;
libvlc_global_data_t *p_libvlc_global = vlc_global();
vlc_object_t *obj = NULL;
vlc_mutex_lock( &structure_lock );
pp_objects = p_libvlc_global->pp_objects;
/* Perform our dichotomy */
for( i_max = p_libvlc_global->i_objects - 1 ; ; )
for( obj = vlc_internals (p_libvlc_global)->next;
obj != VLC_OBJECT (p_libvlc_global);
obj = vlc_internals (obj)->next )
{
i_middle = i_max / 2;
if( pp_objects[i_middle]->i_object_id > i_id )
if( obj->i_object_id == i_id )
{
i_max = i_middle;
}
else if( pp_objects[i_middle]->i_object_id < i_id )
{
if( i_middle )
{
pp_objects += i_middle;
i_max -= i_middle;
}
else
{
/* This happens when there are only two remaining objects */
if( pp_objects[i_middle+1]->i_object_id == i_id )
{
vlc_object_yield( pp_objects[i_middle+1] );
obj = pp_objects[i_middle+1];
}
break;
}
}
else
{
vlc_object_yield( pp_objects[i_middle] );
obj = pp_objects[i_middle];
break;
vlc_object_yield( obj );
return obj;
}
}
......@@ -829,15 +793,10 @@ void __vlc_object_release( vlc_object_t *p_this )
if( b_should_destroy )
{
/* Remove the object from the table
/* Remove the object from object list
* so that it cannot be encountered by vlc_object_get() */
libvlc_global_data_t *p_libvlc_global = vlc_global();
int i_index;
i_index = FindIndex( p_this, p_libvlc_global->pp_objects,
p_libvlc_global->i_objects );
REMOVE_ELEM( p_libvlc_global->pp_objects,
p_libvlc_global->i_objects, i_index );
vlc_internals (internals->next)->prev = internals->prev;
vlc_internals (internals->prev)->next = internals->next;
/* Detach from parent to protect against FIND_CHILDREN */
vlc_object_detach_unlocked (p_this);
......@@ -1023,21 +982,18 @@ vlc_list_t *__vlc_list_children( vlc_object_t *obj )
static int DumpCommand( vlc_object_t *p_this, char const *psz_cmd,
vlc_value_t oldval, vlc_value_t newval, void *p_data )
{
libvlc_global_data_t *p_libvlc_global = vlc_global();
(void)oldval; (void)p_data;
if( *psz_cmd == 'l' )
{
vlc_mutex_lock( &structure_lock );
vlc_object_t **pp_current, **pp_end;
pp_current = p_libvlc_global->pp_objects;
pp_end = pp_current + p_libvlc_global->i_objects;
for( ; pp_current < pp_end ; pp_current++ )
PrintObject( *pp_current, "" );
vlc_object_t *root = VLC_OBJECT (vlc_global ()), *cur = root;
vlc_mutex_lock( &structure_lock );
do
{
PrintObject (cur, "");
cur = vlc_internals (cur)->next;
}
while (cur != root);
vlc_mutex_unlock( &structure_lock );
}
else
......@@ -1212,46 +1168,6 @@ void __vlc_object_dump( vlc_object_t *p_this )
/* Following functions are local */
/*****************************************************************************
* FindIndex: find the index of an object in an array of objects
*****************************************************************************
* This function assumes that p_this can be found in pp_objects. It will not
* crash if p_this cannot be found, but will return a wrong value. It is your
* duty to check the return value if you are not certain that the object could
* be found for sure.
*****************************************************************************/
static int FindIndex( vlc_object_t *p_this,
vlc_object_t **pp_objects, int i_count )
{
int i_middle = i_count / 2;
if( i_count == 0 )
{
return 0;
}
if( pp_objects[i_middle] == p_this )
{
return i_middle;
}
if( i_count == 1 )
{
return 0;
}
/* We take advantage of the sorted array */
if( pp_objects[i_middle]->i_object_id < p_this->i_object_id )
{
return i_middle + FindIndex( p_this, pp_objects + i_middle,
i_count - i_middle );
}
else
{
return FindIndex( p_this, pp_objects, i_middle );
}
}
static vlc_object_t * FindObject( vlc_object_t *p_this, int i_type, int i_mode )
{
int i;
......
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