Red-Black Tree Handler

This group contains the Red-Black Tree Handler implementation. More...

Files
file	bsd-tree.h
	This header file provides a red-black tree implementation.
file	rbtree.h
	This header file provides interfaces of the Red-Black Tree Handler which are used by the implementation, the Application Configuration, and the API.
file	rbtreeimpl.h
	This header file provides interfaces of the Red-Black Tree Handler which are only used by the implementation.
file	rbtreeappend.c
	This source file contains the implementation of _RBTree_Append().
file	rbtreeextract.c
	This source file contains the implementation of _RBTree_Extract().
file	rbtreeinsert.c
	This source file contains the implementation of _RBTree_Insert_color().
file	rbtreeiterate.c
	This source file contains the implementation of _RBTree_Iterate().
file	rbtreemax.c
	This source file contains the implementation of _RBTree_Maximum().
file	rbtreemin.c
	This source file contains the implementation of _RBTree_Minimum().
file	rbtreenext.c
	This source file contains the implementation of _RBTree_Minimum(), _RBTree_Maximum(), _RBTree_Successor(), and _RBTree_Predecessor().
file	rbtreepostorder.c
	This source file contains the implementation of _RBTree_Postorder_next() and _RBTree_Postorder_first().
file	rbtreeprepend.c
	This source file contains the implementation of _RBTree_Prepend().
file	rbtreeprev.c
	This source file contains the implementation of _RBTree_Predecessor().
file	rbtreereplace.c
	This source file contains the implementation of _RBTree_Replace_node().

Data Structures
struct	RBTree_Node
	Red-black tree node. More...

Macros
#define	RBTREE_INITIALIZER_EMPTY(name)    RTEMS_RB_INITIALIZER( name )
	Initializer for an empty red-black tree with designator name.
#define	RBTREE_DEFINE_EMPTY(name)    RBTree_Control name = RBTREE_INITIALIZER_EMPTY( name )
	Definition for an empty red-black tree with designator name.

Typedefs
typedef struct RBTree_Node	RBTree_Node
	Red-black tree node.
typedef bool(*	RBTree_Visitor) (const RBTree_Node *node, void *visitor_arg)
	Red-black tree visitor.

Functions
typedef	RTEMS_RB_HEAD (RBTree_Control, RBTree_Node) RBTree_Control
	Red-black tree control.
void	_RBTree_Insert_color (RBTree_Control *the_rbtree, RBTree_Node *the_node)
	Rebalances the red-black tree after insertion of the node.
void	_RBTree_Extract (RBTree_Control *the_rbtree, RBTree_Node *the_node)
	Extracts (removes) the node from the red-black tree.
RBTree_Node *	_RBTree_Minimum (const RBTree_Control *the_rbtree)
	Returns the minimum node of the red-black tree.
RBTree_Node *	_RBTree_Maximum (const RBTree_Control *the_rbtree)
	Returns the maximum node of the red-black tree.
RBTree_Node *	_RBTree_Predecessor (const RBTree_Node *node)
	Returns the predecessor of a node.
RBTree_Node *	_RBTree_Successor (const RBTree_Node *node)
	Returns the successor of a node.
void	_RBTree_Replace_node (RBTree_Control *the_rbtree, RBTree_Node *victim, RBTree_Node *replacement)
	Replaces a node in the red-black tree without a rebalance.
void *	_RBTree_Postorder_first (const RBTree_Control *the_rbtree, size_t offset)
	Returns the container of the first node of the specified red-black tree in postorder.
void *	_RBTree_Postorder_next (const RBTree_Node *the_node, size_t offset)
	Returns the container of the next node in postorder.
void	_RBTree_Append (RBTree_Control *the_rbtree, RBTree_Node *the_node)
	Appends the node to the red-black tree.
void	_RBTree_Prepend (RBTree_Control *the_rbtree, RBTree_Node *the_node)
	Prepends the node to the red-black tree.
void	_RBTree_Iterate (const RBTree_Control *rbtree, RBTree_Visitor visitor, void *visitor_arg)
	Red-black tree iteration.

Detailed Description

This group contains the Red-Black Tree Handler implementation.

The Red-Black Tree Handler is used to manage sets of entities. This handler provides two data structures. The rbtree Node data structure is included as the first part of every data structure that will be placed on a RBTree. The second data structure is rbtree Control which is used to manage a set of rbtree Nodes.

Typedef Documentation

RBTree_Node

typedef struct RBTree_Node RBTree_Node

Red-black tree node.

This is used to manage each node (element) which is placed on a red-black tree.

RBTree_Visitor

typedef bool(* RBTree_Visitor) (const RBTree_Node *node, void *visitor_arg)

Red-black tree visitor.

Parameters

[in]	node	The node.
[in]	visitor_arg	The visitor argument.

Return values

true	Stop the iteration.
false	Continue the iteration.

See also

_RBTree_Iterate().

Function Documentation

_RBTree_Append()

void _RBTree_Append	(	RBTree_Control *	the_rbtree,
		RBTree_Node *	the_node
	)

Appends the node to the red-black tree.

The appended node is the new maximum node of the tree. The caller shall ensure that the appended node is indeed the maximum node with respect to the tree order.

Parameters

[in,out]	the_rbtree	is the red-black tree control.
	the_node[out]	is the node to append.

_RBTree_Extract()

void _RBTree_Extract	(	RBTree_Control *	the_rbtree,
		RBTree_Node *	the_node
	)

Extracts (removes) the node from the red-black tree.

This function does not set the node off-tree. In the case this is desired, then call _RBTree_Set_off_tree() after the extraction.

In the case the node to extract is not a node of the tree, then this function yields unpredictable results.

Parameters

[in,out]	the_rbtree	The red-black tree control.
[out]	the_node	The node to extract.

_RBTree_Insert_color()

void _RBTree_Insert_color	(	RBTree_Control *	the_rbtree,
		RBTree_Node *	the_node
	)

Rebalances the red-black tree after insertion of the node.

Parameters

[in,out]	the_rbtree	The red-black tree control.
[in,out]	the_node	The most recently inserted node.

_RBTree_Iterate()

void _RBTree_Iterate	(	const RBTree_Control *	rbtree,
		RBTree_Visitor	visitor,
		void *	visitor_arg
	)

Red-black tree iteration.

Parameters

rbtree	The red-black tree.
visitor	The visitor.
visitor_arg	The visitor argument.

_RBTree_Maximum()

RBTree_Node * _RBTree_Maximum

(

const RBTree_Control *

the_rbtree

)

Returns the maximum node of the red-black tree.

Parameters

the_rbtree

The red-black tree control.

Return values

node	The maximum node.
NULL	The red-black tree is empty.

_RBTree_Minimum()

RBTree_Node * _RBTree_Minimum

(

const RBTree_Control *

the_rbtree

)

Returns the minimum node of the red-black tree.

Parameters

the_rbtree

The red-black tree control.

Return values

node	The minimum node.
NULL	The red-black tree is empty.

_RBTree_Postorder_first()

void * _RBTree_Postorder_first	(	const RBTree_Control *	the_rbtree,
		size_t	offset
	)

Returns the container of the first node of the specified red-black tree in postorder.

Postorder traversal may be used to delete all nodes of a red-black tree.

Parameters

the_rbtree	The red-black tree control.
offset	The offset to the red-black tree node in the container structure.

Return values

container	The container of the first node of the specified red-black tree in postorder.
NULL	The red-black tree is empty.

See also

_RBTree_Postorder_next().

#include <rtems/score/rbtree.h>
 
typedef struct {
  int         data;
  RBTree_Node Node;
} Container_Control;
 
void visit( Container_Control *the_container );
 
void postorder_traversal( RBTree_Control *the_rbtree )
{
  Container_Control *the_container;
 
  the_container = _RBTree_Postorder_first(
    the_rbtree,
    offsetof( Container_Control, Node )
  );
 
  while ( the_container != NULL ) {
    visit( the_container );
 
    the_container = _RBTree_Postorder_next(
      &the_container->Node,
      offsetof( Container_Control, Node )
    );
  }
}

_RBTree_Postorder_next()

void * _RBTree_Postorder_next	(	const RBTree_Node *	the_node,
		size_t	offset
	)

Returns the container of the next node in postorder.

Parameters

the_node	The red-black tree node. The node must not be NULL.
offset	The offset to the red-black tree node in the container structure.

Return values

container	The container of the next node in postorder.
NULL	The node is NULL or there is no next node in postorder.

See also

_RBTree_Postorder_first().

_RBTree_Predecessor()

RBTree_Node * _RBTree_Predecessor

(

const RBTree_Node *

node

)

Returns the predecessor of a node.

Parameters

node	is the node.

Return values

node	The predecessor node.
NULL	The predecessor does not exist.

_RBTree_Prepend()

void _RBTree_Prepend	(	RBTree_Control *	the_rbtree,
		RBTree_Node *	the_node
	)

Prepends the node to the red-black tree.

The prepended node is the new minimum node of the tree. The caller shall ensure that the prepended node is indeed the minimum node with respect to the tree order.

Parameters

[in,out]	the_rbtree	is the red-black tree control.
	the_node[out]	is the node to prepend.

_RBTree_Replace_node()

void _RBTree_Replace_node	(	RBTree_Control *	the_rbtree,
		RBTree_Node *	victim,
		RBTree_Node *	replacement
	)

Replaces a node in the red-black tree without a rebalance.

Parameters

[in,out]	the_rbtree	The red-black tree control.
	victim	The victim node.
[out]	replacement	The replacement node.

_RBTree_Successor()

RBTree_Node * _RBTree_Successor

(

const RBTree_Node *

node

)

Returns the successor of a node.

Parameters

node	is the node.

Return values

node	The successor node.
NULL	The successor does not exist.

RTEMS_RB_HEAD()

typedef RTEMS_RB_HEAD	(	RBTree_Control	,
		RBTree_Node
	)

Red-black tree control.

This is used to manage a red-black tree. A red-black tree consists of a tree of zero or more nodes.