1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
121 lines
3.2 KiB
C
121 lines
3.2 KiB
C
#ifndef _LINUX_PRIO_TREE_H
|
|
#define _LINUX_PRIO_TREE_H
|
|
|
|
/*
|
|
* K&R 2nd ed. A8.3 somewhat obliquely hints that initial sequences of struct
|
|
* fields with identical types should end up at the same location. We'll use
|
|
* this until we can scrap struct raw_prio_tree_node.
|
|
*
|
|
* Note: all this could be done more elegantly by using unnamed union/struct
|
|
* fields. However, gcc 2.95.3 and apparently also gcc 3.0.4 don't support this
|
|
* language extension.
|
|
*/
|
|
|
|
struct raw_prio_tree_node {
|
|
struct prio_tree_node *left;
|
|
struct prio_tree_node *right;
|
|
struct prio_tree_node *parent;
|
|
};
|
|
|
|
struct prio_tree_node {
|
|
struct prio_tree_node *left;
|
|
struct prio_tree_node *right;
|
|
struct prio_tree_node *parent;
|
|
unsigned long start;
|
|
unsigned long last; /* last location _in_ interval */
|
|
};
|
|
|
|
struct prio_tree_root {
|
|
struct prio_tree_node *prio_tree_node;
|
|
unsigned short index_bits;
|
|
unsigned short raw;
|
|
/*
|
|
* 0: nodes are of type struct prio_tree_node
|
|
* 1: nodes are of type raw_prio_tree_node
|
|
*/
|
|
};
|
|
|
|
struct prio_tree_iter {
|
|
struct prio_tree_node *cur;
|
|
unsigned long mask;
|
|
unsigned long value;
|
|
int size_level;
|
|
|
|
struct prio_tree_root *root;
|
|
pgoff_t r_index;
|
|
pgoff_t h_index;
|
|
};
|
|
|
|
static inline void prio_tree_iter_init(struct prio_tree_iter *iter,
|
|
struct prio_tree_root *root, pgoff_t r_index, pgoff_t h_index)
|
|
{
|
|
iter->root = root;
|
|
iter->r_index = r_index;
|
|
iter->h_index = h_index;
|
|
iter->cur = NULL;
|
|
}
|
|
|
|
#define __INIT_PRIO_TREE_ROOT(ptr, _raw) \
|
|
do { \
|
|
(ptr)->prio_tree_node = NULL; \
|
|
(ptr)->index_bits = 1; \
|
|
(ptr)->raw = (_raw); \
|
|
} while (0)
|
|
|
|
#define INIT_PRIO_TREE_ROOT(ptr) __INIT_PRIO_TREE_ROOT(ptr, 0)
|
|
#define INIT_RAW_PRIO_TREE_ROOT(ptr) __INIT_PRIO_TREE_ROOT(ptr, 1)
|
|
|
|
#define INIT_PRIO_TREE_NODE(ptr) \
|
|
do { \
|
|
(ptr)->left = (ptr)->right = (ptr)->parent = (ptr); \
|
|
} while (0)
|
|
|
|
#define INIT_PRIO_TREE_ITER(ptr) \
|
|
do { \
|
|
(ptr)->cur = NULL; \
|
|
(ptr)->mask = 0UL; \
|
|
(ptr)->value = 0UL; \
|
|
(ptr)->size_level = 0; \
|
|
} while (0)
|
|
|
|
#define prio_tree_entry(ptr, type, member) \
|
|
((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
|
|
|
|
static inline int prio_tree_empty(const struct prio_tree_root *root)
|
|
{
|
|
return root->prio_tree_node == NULL;
|
|
}
|
|
|
|
static inline int prio_tree_root(const struct prio_tree_node *node)
|
|
{
|
|
return node->parent == node;
|
|
}
|
|
|
|
static inline int prio_tree_left_empty(const struct prio_tree_node *node)
|
|
{
|
|
return node->left == node;
|
|
}
|
|
|
|
static inline int prio_tree_right_empty(const struct prio_tree_node *node)
|
|
{
|
|
return node->right == node;
|
|
}
|
|
|
|
|
|
struct prio_tree_node *prio_tree_replace(struct prio_tree_root *root,
|
|
struct prio_tree_node *old, struct prio_tree_node *node);
|
|
struct prio_tree_node *prio_tree_insert(struct prio_tree_root *root,
|
|
struct prio_tree_node *node);
|
|
void prio_tree_remove(struct prio_tree_root *root, struct prio_tree_node *node);
|
|
struct prio_tree_node *prio_tree_next(struct prio_tree_iter *iter);
|
|
|
|
#define raw_prio_tree_replace(root, old, node) \
|
|
prio_tree_replace(root, (struct prio_tree_node *) (old), \
|
|
(struct prio_tree_node *) (node))
|
|
#define raw_prio_tree_insert(root, node) \
|
|
prio_tree_insert(root, (struct prio_tree_node *) (node))
|
|
#define raw_prio_tree_remove(root, node) \
|
|
prio_tree_remove(root, (struct prio_tree_node *) (node))
|
|
|
|
#endif /* _LINUX_PRIO_TREE_H */
|