f6aac1c3b5
Moving include/sys NetBSD headers to /sys/sys Moving include/arch/*/ NetBSD headers to /sys/arch/*/include Change-Id: Ia1a45d4e83ab806c84093ec2b61bdbea9bed65a0
192 lines
7.1 KiB
C
192 lines
7.1 KiB
C
/* $NetBSD: rbtree.h,v 1.2 2012/02/17 08:20:55 yamt Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2001 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Matt Thomas <matt@3am-software.com>.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef _SYS_RBTREE_H_
|
|
#define _SYS_RBTREE_H_
|
|
|
|
#if defined(_KERNEL) || defined(_STANDALONE)
|
|
#include <sys/types.h>
|
|
#else
|
|
#include <stdbool.h>
|
|
#include <inttypes.h>
|
|
#endif
|
|
#include <sys/queue.h>
|
|
#include <sys/endian.h>
|
|
|
|
__BEGIN_DECLS
|
|
|
|
typedef struct rb_node {
|
|
struct rb_node *rb_nodes[2];
|
|
#define RB_DIR_LEFT 0
|
|
#define RB_DIR_RIGHT 1
|
|
#define RB_DIR_OTHER 1
|
|
#define rb_left rb_nodes[RB_DIR_LEFT]
|
|
#define rb_right rb_nodes[RB_DIR_RIGHT]
|
|
|
|
/*
|
|
* rb_info contains the two flags and the parent back pointer.
|
|
* We put the two flags in the low two bits since we know that
|
|
* rb_node will have an alignment of 4 or 8 bytes.
|
|
*/
|
|
uintptr_t rb_info;
|
|
#define RB_FLAG_POSITION 0x2
|
|
#define RB_FLAG_RED 0x1
|
|
#define RB_FLAG_MASK (RB_FLAG_POSITION|RB_FLAG_RED)
|
|
#define RB_FATHER(rb) \
|
|
((struct rb_node *)((rb)->rb_info & ~RB_FLAG_MASK))
|
|
#define RB_SET_FATHER(rb, father) \
|
|
((void)((rb)->rb_info = (uintptr_t)(father)|((rb)->rb_info & RB_FLAG_MASK)))
|
|
|
|
#define RB_SENTINEL_P(rb) ((rb) == NULL)
|
|
#define RB_LEFT_SENTINEL_P(rb) RB_SENTINEL_P((rb)->rb_left)
|
|
#define RB_RIGHT_SENTINEL_P(rb) RB_SENTINEL_P((rb)->rb_right)
|
|
#define RB_FATHER_SENTINEL_P(rb) RB_SENTINEL_P(RB_FATHER((rb)))
|
|
#define RB_CHILDLESS_P(rb) \
|
|
(RB_SENTINEL_P(rb) || (RB_LEFT_SENTINEL_P(rb) && RB_RIGHT_SENTINEL_P(rb)))
|
|
#define RB_TWOCHILDREN_P(rb) \
|
|
(!RB_SENTINEL_P(rb) && !RB_LEFT_SENTINEL_P(rb) && !RB_RIGHT_SENTINEL_P(rb))
|
|
|
|
#define RB_POSITION(rb) \
|
|
(((rb)->rb_info & RB_FLAG_POSITION) ? RB_DIR_RIGHT : RB_DIR_LEFT)
|
|
#define RB_RIGHT_P(rb) (RB_POSITION(rb) == RB_DIR_RIGHT)
|
|
#define RB_LEFT_P(rb) (RB_POSITION(rb) == RB_DIR_LEFT)
|
|
#define RB_RED_P(rb) (!RB_SENTINEL_P(rb) && ((rb)->rb_info & RB_FLAG_RED) != 0)
|
|
#define RB_BLACK_P(rb) (RB_SENTINEL_P(rb) || ((rb)->rb_info & RB_FLAG_RED) == 0)
|
|
#define RB_MARK_RED(rb) ((void)((rb)->rb_info |= RB_FLAG_RED))
|
|
#define RB_MARK_BLACK(rb) ((void)((rb)->rb_info &= ~RB_FLAG_RED))
|
|
#define RB_INVERT_COLOR(rb) ((void)((rb)->rb_info ^= RB_FLAG_RED))
|
|
#define RB_ROOT_P(rbt, rb) ((rbt)->rbt_root == (rb))
|
|
#define RB_SET_POSITION(rb, position) \
|
|
((void)((position) ? ((rb)->rb_info |= RB_FLAG_POSITION) : \
|
|
((rb)->rb_info &= ~RB_FLAG_POSITION)))
|
|
#define RB_ZERO_PROPERTIES(rb) ((void)((rb)->rb_info &= ~RB_FLAG_MASK))
|
|
#define RB_COPY_PROPERTIES(dst, src) \
|
|
((void)((dst)->rb_info ^= ((dst)->rb_info ^ (src)->rb_info) & RB_FLAG_MASK))
|
|
#define RB_SWAP_PROPERTIES(a, b) do { \
|
|
uintptr_t xorinfo = ((a)->rb_info ^ (b)->rb_info) & RB_FLAG_MASK; \
|
|
(a)->rb_info ^= xorinfo; \
|
|
(b)->rb_info ^= xorinfo; \
|
|
} while (/*CONSTCOND*/ 0)
|
|
#ifdef RBDEBUG
|
|
TAILQ_ENTRY(rb_node) rb_link;
|
|
#endif
|
|
} rb_node_t;
|
|
|
|
#define RB_TREE_MIN(T) rb_tree_iterate((T), NULL, RB_DIR_LEFT)
|
|
#define RB_TREE_MAX(T) rb_tree_iterate((T), NULL, RB_DIR_RIGHT)
|
|
#define RB_TREE_FOREACH(N, T) \
|
|
for ((N) = RB_TREE_MIN(T); (N); \
|
|
(N) = rb_tree_iterate((T), (N), RB_DIR_RIGHT))
|
|
#define RB_TREE_FOREACH_REVERSE(N, T) \
|
|
for ((N) = RB_TREE_MAX(T); (N); \
|
|
(N) = rb_tree_iterate((T), (N), RB_DIR_LEFT))
|
|
|
|
#ifdef RBDEBUG
|
|
TAILQ_HEAD(rb_node_qh, rb_node);
|
|
|
|
#define RB_TAILQ_REMOVE(a, b, c) TAILQ_REMOVE(a, b, c)
|
|
#define RB_TAILQ_INIT(a) TAILQ_INIT(a)
|
|
#define RB_TAILQ_INSERT_HEAD(a, b, c) TAILQ_INSERT_HEAD(a, b, c)
|
|
#define RB_TAILQ_INSERT_BEFORE(a, b, c) TAILQ_INSERT_BEFORE(a, b, c)
|
|
#define RB_TAILQ_INSERT_AFTER(a, b, c, d) TAILQ_INSERT_AFTER(a, b, c, d)
|
|
#else
|
|
#define RB_TAILQ_REMOVE(a, b, c) do { } while (/*CONSTCOND*/0)
|
|
#define RB_TAILQ_INIT(a) do { } while (/*CONSTCOND*/0)
|
|
#define RB_TAILQ_INSERT_HEAD(a, b, c) do { } while (/*CONSTCOND*/0)
|
|
#define RB_TAILQ_INSERT_BEFORE(a, b, c) do { } while (/*CONSTCOND*/0)
|
|
#define RB_TAILQ_INSERT_AFTER(a, b, c, d) do { } while (/*CONSTCOND*/0)
|
|
#endif /* RBDEBUG */
|
|
|
|
/*
|
|
* rbto_compare_nodes_fn:
|
|
* return a positive value if the first node > the second node.
|
|
* return a negative value if the first node < the second node.
|
|
* return 0 if they are considered same.
|
|
*
|
|
* rbto_compare_key_fn:
|
|
* return a positive value if the node > the key.
|
|
* return a negative value if the node < the key.
|
|
* return 0 if they are considered same.
|
|
*/
|
|
|
|
typedef signed int (*rbto_compare_nodes_fn)(void *, const void *, const void *);
|
|
typedef signed int (*rbto_compare_key_fn)(void *, const void *, const void *);
|
|
|
|
typedef struct {
|
|
rbto_compare_nodes_fn rbto_compare_nodes;
|
|
rbto_compare_key_fn rbto_compare_key;
|
|
size_t rbto_node_offset;
|
|
void *rbto_context;
|
|
} rb_tree_ops_t;
|
|
|
|
typedef struct rb_tree {
|
|
struct rb_node *rbt_root;
|
|
const rb_tree_ops_t *rbt_ops;
|
|
struct rb_node *rbt_minmax[2];
|
|
#ifdef RBDEBUG
|
|
struct rb_node_qh rbt_nodes;
|
|
#endif
|
|
#ifdef RBSTATS
|
|
unsigned int rbt_count;
|
|
unsigned int rbt_insertions;
|
|
unsigned int rbt_removals;
|
|
unsigned int rbt_insertion_rebalance_calls;
|
|
unsigned int rbt_insertion_rebalance_passes;
|
|
unsigned int rbt_removal_rebalance_calls;
|
|
unsigned int rbt_removal_rebalance_passes;
|
|
#endif
|
|
} rb_tree_t;
|
|
|
|
#ifdef RBSTATS
|
|
#define RBSTAT_INC(v) ((void)((v)++))
|
|
#define RBSTAT_DEC(v) ((void)((v)--))
|
|
#else
|
|
#define RBSTAT_INC(v) do { } while (/*CONSTCOND*/0)
|
|
#define RBSTAT_DEC(v) do { } while (/*CONSTCOND*/0)
|
|
#endif
|
|
|
|
void rb_tree_init(rb_tree_t *, const rb_tree_ops_t *);
|
|
void * rb_tree_insert_node(rb_tree_t *, void *);
|
|
void * rb_tree_find_node(rb_tree_t *, const void *);
|
|
void * rb_tree_find_node_geq(rb_tree_t *, const void *);
|
|
void * rb_tree_find_node_leq(rb_tree_t *, const void *);
|
|
void rb_tree_remove_node(rb_tree_t *, void *);
|
|
void * rb_tree_iterate(rb_tree_t *, void *, const unsigned int);
|
|
#ifdef RBDEBUG
|
|
void rb_tree_check(const rb_tree_t *, bool);
|
|
#endif
|
|
#ifdef RBSTATS
|
|
void rb_tree_depths(const rb_tree_t *, size_t *);
|
|
#endif
|
|
|
|
__END_DECLS
|
|
|
|
#endif /* _SYS_RBTREE_H_*/
|