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本帖最后由 rc8523 于 2011-07-26 11:18 编辑
发个前不久写的东西
『Linux内核红黑树之通用红黑树』
经测试通过暂时没有发现问题,特发出来共享,欢迎拍砖
代码依照优良的Linux编码传统
对于一般返回int的函数, 返回<0是错误,0是正常的情况
对于一般返回指针的函数,返回空指针是错误,非空是正常的情况
下面附件有打包好的,简要介绍一下每一个文件:
1. rbtree.h 从Linux源码扒下来的红黑树代码文件
2. rbtree.c 从Linux源码扒下来的红黑树头文件
3. rbtree_rc.h 封装Linux内核红黑树成为通用红黑树的头文件
4. rbtree_rc.c 实现的封装Linux内核红黑树成为通用红黑树的代码
5. rbtest1.c 对树的测试用例1, 测试各项基本功能
6. rbtest2.c 对树的测试用例2, 进行大量节点的插入,替换,删除操作,
曾在vmware,512内存的配置成单核虚拟机,实际电脑2.6GHz双核I3CPU上
测试过分配100万节点的插入,替换,删除,几乎都是瞬间完成,这足以说明红黑的强悍效率,
可以取消屏幕打印操作试试,因为效率都消耗在打印上了
打包的代码文件是10万节点,可以改大试试
对红黑不了解的童鞋们去找这方面的资料看看
7. makefile 执行编译创建可执行测试用例的文件
内核红黑树代码某些地方经过略微修改,所以还是有必要帖一下
所有源码文件和头文件还有工程编译makefile文件放在同一目录下
直接执行make命令即可生成测试用例 rbtest1 和 rbtest2
//内核红黑树实现文件
//rbtree.c- /*
- Red Black Trees
- (C) 1999 Andrea Arcangeli <andrea@suse.de>
- (C) 2002 David Woodhouse <dwmw2@infradead.org>
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- linux/lib/rbtree.c
- */
- #include "rbtree.h"
- //#include <linux/module.h>
- static void __rb_rotate_left(struct rb_node *node, struct rb_root *root)
- {
- struct rb_node *right = node->rb_right;
- struct rb_node *parent = rb_parent(node);
- if ((node->rb_right = right->rb_left))
- rb_set_parent(right->rb_left, node);
- right->rb_left = node;
- rb_set_parent(right, parent);
- if (parent)
- {
- if (node == parent->rb_left)
- parent->rb_left = right;
- else
- parent->rb_right = right;
- }
- else
- root->rb_node = right;
- rb_set_parent(node, right);
- }
- static void __rb_rotate_right(struct rb_node *node, struct rb_root *root)
- {
- struct rb_node *left = node->rb_left;
- struct rb_node *parent = rb_parent(node);
- if ((node->rb_left = left->rb_right))
- rb_set_parent(left->rb_right, node);
- left->rb_right = node;
- rb_set_parent(left, parent);
- if (parent)
- {
- if (node == parent->rb_right)
- parent->rb_right = left;
- else
- parent->rb_left = left;
- }
- else
- root->rb_node = left;
- rb_set_parent(node, left);
- }
- void rb_insert_color(struct rb_node *node, struct rb_root *root)
- {
- struct rb_node *parent, *gparent;
- while ((parent = rb_parent(node)) && rb_is_red(parent))
- {
- gparent = rb_parent(parent);
- if (parent == gparent->rb_left)
- {
- {
- register struct rb_node *uncle = gparent->rb_right;
- if (uncle && rb_is_red(uncle))
- {
- rb_set_black(uncle);
- rb_set_black(parent);
- rb_set_red(gparent);
- node = gparent;
- continue;
- }
- }
- if (parent->rb_right == node)
- {
- register struct rb_node *tmp;
- __rb_rotate_left(parent, root);
- tmp = parent;
- parent = node;
- node = tmp;
- }
- rb_set_black(parent);
- rb_set_red(gparent);
- __rb_rotate_right(gparent, root);
- } else {
- {
- register struct rb_node *uncle = gparent->rb_left;
- if (uncle && rb_is_red(uncle))
- {
- rb_set_black(uncle);
- rb_set_black(parent);
- rb_set_red(gparent);
- node = gparent;
- continue;
- }
- }
- if (parent->rb_left == node)
- {
- register struct rb_node *tmp;
- __rb_rotate_right(parent, root);
- tmp = parent;
- parent = node;
- node = tmp;
- }
- rb_set_black(parent);
- rb_set_red(gparent);
- __rb_rotate_left(gparent, root);
- }
- }
- rb_set_black(root->rb_node);
- }
- //EXPORT_SYMBOL(rb_insert_color);
- static void __rb_erase_color(struct rb_node *node, struct rb_node *parent,
- struct rb_root *root)
- {
- struct rb_node *other;
- while ((!node || rb_is_black(node)) && node != root->rb_node)
- {
- if (parent->rb_left == node)
- {
- other = parent->rb_right;
- if (rb_is_red(other))
- {
- rb_set_black(other);
- rb_set_red(parent);
- __rb_rotate_left(parent, root);
- other = parent->rb_right;
- }
- if ((!other->rb_left || rb_is_black(other->rb_left)) &&
- (!other->rb_right || rb_is_black(other->rb_right)))
- {
- rb_set_red(other);
- node = parent;
- parent = rb_parent(node);
- }
- else
- {
- if (!other->rb_right || rb_is_black(other->rb_right))
- {
- rb_set_black(other->rb_left);
- rb_set_red(other);
- __rb_rotate_right(other, root);
- other = parent->rb_right;
- }
- rb_set_color(other, rb_color(parent));
- rb_set_black(parent);
- rb_set_black(other->rb_right);
- __rb_rotate_left(parent, root);
- node = root->rb_node;
- break;
- }
- }
- else
- {
- other = parent->rb_left;
- if (rb_is_red(other))
- {
- rb_set_black(other);
- rb_set_red(parent);
- __rb_rotate_right(parent, root);
- other = parent->rb_left;
- }
- if ((!other->rb_left || rb_is_black(other->rb_left)) &&
- (!other->rb_right || rb_is_black(other->rb_right)))
- {
- rb_set_red(other);
- node = parent;
- parent = rb_parent(node);
- }
- else
- {
- if (!other->rb_left || rb_is_black(other->rb_left))
- {
- rb_set_black(other->rb_right);
- rb_set_red(other);
- __rb_rotate_left(other, root);
- other = parent->rb_left;
- }
- rb_set_color(other, rb_color(parent));
- rb_set_black(parent);
- rb_set_black(other->rb_left);
- __rb_rotate_right(parent, root);
- node = root->rb_node;
- break;
- }
- }
- }
- if (node)
- rb_set_black(node);
- }
- void rb_erase(struct rb_node *node, struct rb_root *root)
- {
- struct rb_node *child, *parent;
- int color;
- if (!node->rb_left)
- child = node->rb_right;
- else if (!node->rb_right)
- child = node->rb_left;
- else
- {
- struct rb_node *old = node, *left;
- node = node->rb_right;
- while ((left = node->rb_left) != NULL)
- node = left;
- if (rb_parent(old)) {
- if (rb_parent(old)->rb_left == old)
- rb_parent(old)->rb_left = node;
- else
- rb_parent(old)->rb_right = node;
- } else
- root->rb_node = node;
- child = node->rb_right;
- parent = rb_parent(node);
- color = rb_color(node);
- if (parent == old) {
- parent = node;
- } else {
- if (child)
- rb_set_parent(child, parent);
- parent->rb_left = child;
- node->rb_right = old->rb_right;
- rb_set_parent(old->rb_right, node);
- }
- node->rb_parent_color = old->rb_parent_color;
- node->rb_left = old->rb_left;
- rb_set_parent(old->rb_left, node);
- goto color;
- }
- parent = rb_parent(node);
- color = rb_color(node);
- if (child)
- rb_set_parent(child, parent);
- if (parent)
- {
- if (parent->rb_left == node)
- parent->rb_left = child;
- else
- parent->rb_right = child;
- }
- else
- root->rb_node = child;
- color:
- if (color == RB_BLACK)
- __rb_erase_color(child, parent, root);
- }
- //EXPORT_SYMBOL(rb_erase);
- static void rb_augment_path(struct rb_node *node, rb_augment_f func, void *data)
- {
- struct rb_node *parent;
- up:
- func(node, data);
- parent = rb_parent(node);
- if (!parent)
- return;
- if (node == parent->rb_left && parent->rb_right)
- func(parent->rb_right, data);
- else if (parent->rb_left)
- func(parent->rb_left, data);
- node = parent;
- goto up;
- }
- /*
- * after inserting @node into the tree, update the tree to account for
- * both the new entry and any damage done by rebalance
- */
- void rb_augment_insert(struct rb_node *node, rb_augment_f func, void *data)
- {
- if (node->rb_left)
- node = node->rb_left;
- else if (node->rb_right)
- node = node->rb_right;
- rb_augment_path(node, func, data);
- }
- /*
- * before removing the node, find the deepest node on the rebalance path
- * that will still be there after @node gets removed
- */
- struct rb_node *rb_augment_erase_begin(struct rb_node *node)
- {
- struct rb_node *deepest;
- if (!node->rb_right && !node->rb_left)
- deepest = rb_parent(node);
- else if (!node->rb_right)
- deepest = node->rb_left;
- else if (!node->rb_left)
- deepest = node->rb_right;
- else {
- deepest = rb_next(node);
- if (deepest->rb_right)
- deepest = deepest->rb_right;
- else if (rb_parent(deepest) != node)
- deepest = rb_parent(deepest);
- }
- return deepest;
- }
- /*
- * after removal, update the tree to account for the removed entry
- * and any rebalance damage.
- */
- void rb_augment_erase_end(struct rb_node *node, rb_augment_f func, void *data)
- {
- if (node)
- rb_augment_path(node, func, data);
- }
- /*
- * This function returns the first node (in sort order) of the tree.
- */
- struct rb_node *rb_first(const struct rb_root *root)
- {
- struct rb_node *n;
- n = root->rb_node;
- if (!n)
- return NULL;
- while (n->rb_left)
- n = n->rb_left;
- return n;
- }
- //EXPORT_SYMBOL(rb_first);
- struct rb_node *rb_last(const struct rb_root *root)
- {
- struct rb_node *n;
- n = root->rb_node;
- if (!n)
- return NULL;
- while (n->rb_right)
- n = n->rb_right;
- return n;
- }
- //EXPORT_SYMBOL(rb_last);
- struct rb_node *rb_next(const struct rb_node *node)
- {
- struct rb_node *parent;
- if (rb_parent(node) == node)
- return NULL;
- /* If we have a right-hand child, go down and then left as far
- as we can. */
- if (node->rb_right) {
- node = node->rb_right;
- while (node->rb_left)
- node=node->rb_left;
- return (struct rb_node *)node;
- }
- /* No right-hand children. Everything down and left is
- smaller than us, so any 'next' node must be in the general
- direction of our parent. Go up the tree; any time the
- ancestor is a right-hand child of its parent, keep going
- up. First time it's a left-hand child of its parent, said
- parent is our 'next' node. */
- while ((parent = rb_parent(node)) && node == parent->rb_right)
- node = parent;
- return parent;
- }
- //EXPORT_SYMBOL(rb_next);
- struct rb_node *rb_prev(const struct rb_node *node)
- {
- struct rb_node *parent;
- if (rb_parent(node) == node)
- return NULL;
- /* If we have a left-hand child, go down and then right as far
- as we can. */
- if (node->rb_left) {
- node = node->rb_left;
- while (node->rb_right)
- node=node->rb_right;
- return (struct rb_node *)node;
- }
- /* No left-hand children. Go up till we find an ancestor which
- is a right-hand child of its parent */
- while ((parent = rb_parent(node)) && node == parent->rb_left)
- node = parent;
- return parent;
- }
- //EXPORT_SYMBOL(rb_prev);
- void rb_replace_node(struct rb_node *victim, struct rb_node *new,
- struct rb_root *root)
- {
- struct rb_node *parent = rb_parent(victim);
- /* Set the surrounding nodes to point to the replacement */
- if (parent) {
- if (victim == parent->rb_left)
- parent->rb_left = new;
- else
- parent->rb_right = new;
- } else {
- root->rb_node = new;
- }
- if (victim->rb_left)
- rb_set_parent(victim->rb_left, new);
- if (victim->rb_right)
- rb_set_parent(victim->rb_right, new);
- /* Copy the pointers/colour from the victim to the replacement */
- *new = *victim;
- }
- //EXPORT_SYMBOL(rb_replace_node);
复制代码 //内核红黑树头文件
//rbtree.h- #ifndef _LINUX_RBTREE_H
- #define _LINUX_RBTREE_H
- //#include <linux/kernel.h>
- //#include <linux/stddef.h>
- #include <stddef.h>
- struct rb_node
- {
- unsigned long rb_parent_color;
- #define RB_RED 0
- #define RB_BLACK 1
- struct rb_node *rb_right;
- struct rb_node *rb_left;
- } __attribute__((aligned(sizeof(long))));
- /* The alignment might seem pointless, but allegedly CRIS needs it */
- struct rb_root
- {
- struct rb_node *rb_node;
- };
- #define rb_parent(r) ((struct rb_node *)((r)->rb_parent_color & ~3))
- #define rb_color(r) ((r)->rb_parent_color & 1)
- #define rb_is_red(r) (!rb_color(r))
- #define rb_is_black(r) rb_color(r)
- #define rb_set_red(r) do { (r)->rb_parent_color &= ~1; } while (0)
- #define rb_set_black(r) do { (r)->rb_parent_color |= 1; } while (0)
- static
- inline void rb_set_parent(struct rb_node *rb, struct rb_node *p)
- {
- rb->rb_parent_color = (rb->rb_parent_color & 3) | (unsigned long)p;
- }
- static
- inline void rb_set_color(struct rb_node *rb, int color)
- {
- rb->rb_parent_color = (rb->rb_parent_color & ~1) | color;
- }
- /**********************************************************/
- #ifndef offsetof
- #define offsetof(type, member) \
- (size_t)&(((type *)0)->member)
- #endif
- #ifndef container_of
- #define container_of(ptr, type, member) \
- ({\
- const typeof(((type *)0)->member) * __mptr = (ptr);\
- (type *)((char *)__mptr - offsetof(type, member)); \
- })
- #endif
- /**********************************************************/
- #define RB_ROOT (struct rb_root) { NULL, }
- #define rb_entry(ptr, type, member) container_of(ptr, type, member)
- #define RB_EMPTY_ROOT(root) ((root)->rb_node == NULL)
- #define RB_EMPTY_NODE(node) (rb_parent(node) == node)
- #define RB_CLEAR_NODE(node) (rb_set_parent(node, node))
- extern void rb_insert_color(struct rb_node *, struct rb_root *);
- extern void rb_erase(struct rb_node *, struct rb_root *);
- typedef void (*rb_augment_f)(struct rb_node *node, void *data);
- extern void rb_augment_insert(struct rb_node *node,
- rb_augment_f func, void *data);
- extern struct rb_node *rb_augment_erase_begin(struct rb_node *node);
- extern void rb_augment_erase_end(struct rb_node *node,
- rb_augment_f func, void *data);
- /* Find logical next and previous nodes in a tree */
- extern struct rb_node *rb_next(const struct rb_node *);
- extern struct rb_node *rb_prev(const struct rb_node *);
- extern struct rb_node *rb_first(const struct rb_root *);
- extern struct rb_node *rb_last(const struct rb_root *);
- /* Fast replacement of a single node without remove/rebalance/add/rebalance */
- extern void rb_replace_node(struct rb_node *victim, struct rb_node *new,
- struct rb_root *root);
- static
- inline void rb_link_node(struct rb_node * node, struct rb_node * parent,
- struct rb_node ** rb_link)
- {
- node->rb_parent_color = (unsigned long )parent;
- node->rb_left = node->rb_right = NULL;
- *rb_link = node;
- }
- #endif /* _LINUX_RBTREE_H */
复制代码 //头文件
//rbtree_rc.h- #ifndef __RCYH_RBTREE_RC_H__
- #define __RCYH_RBTREE_RC_H__
- #include "rbtree.h"
- struct rb_data
- {
- signed long key;
- unsigned long size;
- unsigned char data[];
- };
- struct container
- {
- struct rb_node rb_node;
- struct rb_data rb_data;
- };
- /*
- * Initializing rbtree root
- */
- extern void
- init_rbtree(struct rb_root *root);
- /*
- * Search key node from rbtree
- */
- extern struct container *
- container_search(struct rb_root *root, int key);
- /*
- * Insert key node into rbtree
- */
- extern int
- container_insert(struct rb_root *root, struct container *cont);
- /*
- * Delete the key node from rbtree
- * delete node from rbtree, return node pointer
- */
- extern struct container *
- container_delete(struct rb_root *root, int key);
- /*
- * Replace the key node from rbtree for new container
- * replace node from rbtree, return old node pointer
- */
- struct container *
- container_replace(struct rb_root *root, int key, struct container *con);
- #endif /* __RCYH_RBTREE_RC_H__ */
复制代码 //封装的红黑树插入,查找,删除,替换实现文件
//rbtree_rc.c- #include "rbtree_rc.h"
- #include <stddef.h>
- /*
- * Initializing rbtree root
- */
- void init_rbtree(struct rb_root *root)
- {
- *root = RB_ROOT;
- }
- /*
- * Search key node from rbtree
- */
- struct container *container_search(struct rb_root *root, int key)
- {
- struct rb_node *node = root->rb_node;
-
- while (node)
- {
- struct container *this = rb_entry(node, struct container, rb_node);
-
- int result = key - this->rb_data.key;
-
- if (result < 0)
- node = node->rb_left;
- else if (result > 0)
- node = node->rb_right;
- else
- return this;
- }
- return 0;
- }
- /*
- * Insert key node into rbtree
- */
- int container_insert(struct rb_root *root, struct container *cont)
- {
- struct rb_node **new = &(root->rb_node);
- struct rb_node *parent = 0;
-
- /* Figure out where to put new node */
- while (*new)
- {
- struct container *this = rb_entry(*new, struct container, rb_node);
-
- int result = cont->rb_data.key - this->rb_data.key;
-
- parent = *new;
-
- if (result < 0)
- new = &((*new)->rb_left);
- else if (result > 0)
- new = &((*new)->rb_right);
- else
- return -1; // the key is already exists
- }
- /* Add new node and rebalance tree. */
- rb_link_node(&(cont->rb_node), parent, new);
- rb_insert_color(&(cont->rb_node), root);
- return 0;
- }
- /*
- * Delete the key node from rbtree
- * delete node from rbtree, return node pointer
- */
- struct container *container_delete(struct rb_root *root, int key)
- {
- struct container *find = container_search(root, key);
- if (!find)
- return 0;
- rb_erase(&find->rb_node, root);
- return find;
- }
- /*
- * Replace the key node from rbtree for new container
- * replace node from rbtree, return old node pointer
- */
- struct container * container_replace(struct rb_root *root, int key, struct container *con)
- {
- struct container *find = container_search(root, key);
- if (!find)
- return 0;
- rb_replace_node(&(find->rb_node), &con->rb_node, root);
- return find;
- }
复制代码 一个帖子发不下说是超了, 下面跟一个, 是两个测试用例的源码 |
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