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an implementation of radix tree. the idea from linux.

This commit is contained in:
yamt 2011-02-22 21:31:15 +00:00
parent 0aabb9242a
commit 62e2ded66d
2 changed files with 1204 additions and 0 deletions
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1122
common/lib/libc/gen/radixtree.c Normal file
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sys/sys/radixtree.h Normal file
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/* $NetBSD: radixtree.h,v 1.1 2011/02/22 21:31:15 yamt Exp $ */
/*-
* Copyright (c)2011 YAMAMOTO Takashi,
* All rights reserved.
*
* 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 AUTHOR 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 AUTHOR 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.
*/
#if !defined(_SYS_RADIXTREE_H_)
#define _SYS_RADIXTREE_H_
struct radix_tree {
void *t_root;
unsigned int t_height;
};
#if defined(_KERNEL)
#include <sys/types.h>
#else /* defined(_KERNEL) */
#include <stdbool.h>
#include <stdint.h>
#endif /* defined(_KERNEL) */
/*
* subsystem
*/
#if defined(_KERNEL)
void radix_tree_init(void);
#endif /* defined(_KERNEL) */
/*
* tree
*/
void radix_tree_init_tree(struct radix_tree *);
void radix_tree_fini_tree(struct radix_tree *);
/*
* node
*/
int radix_tree_insert_node(struct radix_tree *, uint64_t, void *);
void *radix_tree_replace_node(struct radix_tree *, uint64_t, void *);
void *radix_tree_remove_node(struct radix_tree *, uint64_t);
void *radix_tree_lookup_node(struct radix_tree *, uint64_t);
unsigned int radix_tree_gang_lookup_node(struct radix_tree *, uint64_t,
void **, unsigned int);
/*
* tag
*/
typedef int radix_tree_tagid_t;
#define RADIX_TREE_TAG_ID_MAX 2
bool radix_tree_get_tag(struct radix_tree *, uint64_t, radix_tree_tagid_t);
void radix_tree_set_tag(struct radix_tree *, uint64_t, radix_tree_tagid_t);
void radix_tree_clear_tag(struct radix_tree *, uint64_t, radix_tree_tagid_t);
unsigned int radix_tree_gang_lookup_tagged_node(struct radix_tree *, uint64_t,
void **, unsigned int, radix_tree_tagid_t);
#endif /* !defined(_SYS_RADIXTREE_H_) */