LXR linux-bk/include/linux/prio

   1#ifndef _LINUX_PRIO_TREE_H
   2#define _LINUX_PRIO_TREE_H
   3
   4struct prio_tree_node {
   5        struct prio_tree_node   *left;
   6        struct prio_tree_node   *right;
   7        struct prio_tree_node   *parent;
   8};
   9
  10struct prio_tree_root {
  11        struct prio_tree_node   *prio_tree_node;
  12        unsigned int            index_bits;
  13};
  14
  15struct prio_tree_iter {
  16        struct prio_tree_node   *cur;
  17        unsigned long           mask;
  18        unsigned long           value;
  19        int                     size_level;
  20};
  21
  22#define INIT_PRIO_TREE_ROOT(ptr)        \
  23do {                                    \
  24        (ptr)->prio_tree_node = NULL;   \
  25        (ptr)->index_bits = 1;          \
  26} while (0)
  27
  28#define INIT_PRIO_TREE_NODE(ptr)                                \
  29do {                                                            \
  30        (ptr)->left = (ptr)->right = (ptr)->parent = (ptr);     \
  31} while (0)
  32
  33#define INIT_PRIO_TREE_ITER(ptr)        \
  34do {                                    \
  35        (ptr)->cur = NULL;              \
  36        (ptr)->mask = 0UL;              \
  37        (ptr)->value = 0UL;             \
  38        (ptr)->size_level = 0;          \
  39} while (0)
  40
  41#define prio_tree_entry(ptr, type, member) \
  42       ((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
  43
  44static inline int prio_tree_empty(const struct prio_tree_root *root)
  45{
  46        return root->prio_tree_node == NULL;
  47}
  48
  49static inline int prio_tree_root(const struct prio_tree_node *node)
  50{
  51        return node->parent == node;
  52}
  53
  54static inline int prio_tree_left_empty(const struct prio_tree_node *node)
  55{
  56        return node->left == node;
  57}
  58
  59static inline int prio_tree_right_empty(const struct prio_tree_node *node)
  60{
  61        return node->right == node;
  62}
  63
  64#endif /* _LINUX_PRIO_TREE_H */
  65