77 lines
1.6 KiB
C
77 lines
1.6 KiB
C
#ifndef _LINUX_PRIO_TREE_H
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#define _LINUX_PRIO_TREE_H
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struct prio_tree_node {
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struct prio_tree_node *left;
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struct prio_tree_node *right;
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struct prio_tree_node *parent;
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};
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struct prio_tree_root {
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struct prio_tree_node *prio_tree_node;
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unsigned int index_bits;
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};
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struct prio_tree_iter {
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struct prio_tree_node *cur;
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unsigned long mask;
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unsigned long value;
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int size_level;
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struct prio_tree_root *root;
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pgoff_t r_index;
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pgoff_t h_index;
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};
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static inline void prio_tree_iter_init(struct prio_tree_iter *iter,
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struct prio_tree_root *root, pgoff_t r_index, pgoff_t h_index)
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{
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iter->root = root;
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iter->r_index = r_index;
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iter->h_index = h_index;
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}
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#define INIT_PRIO_TREE_ROOT(ptr) \
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do { \
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(ptr)->prio_tree_node = NULL; \
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(ptr)->index_bits = 1; \
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} while (0)
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#define INIT_PRIO_TREE_NODE(ptr) \
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do { \
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(ptr)->left = (ptr)->right = (ptr)->parent = (ptr); \
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} while (0)
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#define INIT_PRIO_TREE_ITER(ptr) \
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do { \
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(ptr)->cur = NULL; \
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(ptr)->mask = 0UL; \
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(ptr)->value = 0UL; \
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(ptr)->size_level = 0; \
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} while (0)
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#define prio_tree_entry(ptr, type, member) \
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((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
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static inline int prio_tree_empty(const struct prio_tree_root *root)
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{
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return root->prio_tree_node == NULL;
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}
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static inline int prio_tree_root(const struct prio_tree_node *node)
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{
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return node->parent == node;
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}
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static inline int prio_tree_left_empty(const struct prio_tree_node *node)
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{
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return node->left == node;
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}
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static inline int prio_tree_right_empty(const struct prio_tree_node *node)
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{
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return node->right == node;
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}
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#endif /* _LINUX_PRIO_TREE_H */
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