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/* bheaps.h -- Binomial Heaps
*
* (c) 2008, 2009 Bjoern Brandenburg
*/
#ifndef BHEAP_H
#define BHEAP_H
#define NOT_IN_HEAP UINT_MAX
struct bheap_node {
struct bheap_node* parent;
struct bheap_node* next;
struct bheap_node* child;
unsigned int degree;
void* value;
struct bheap_node** ref;
};
struct bheap {
struct bheap_node* head;
/* We cache the minimum of the heap.
* This speeds up repeated peek operations.
*/
struct bheap_node* min;
};
typedef int (*bheap_prio_t)(struct bheap_node* a, struct bheap_node* b);
void bheap_init(struct bheap* heap);
void bheap_node_init(struct bheap_node** ref_to_bheap_node_ptr, void* value);
static inline int bheap_node_in_heap(struct bheap_node* h)
{
return h->degree != NOT_IN_HEAP;
}
static inline int bheap_empty(struct bheap* heap)
{
return heap->head == NULL && heap->min == NULL;
}
/* insert (and reinitialize) a node into the heap */
void bheap_insert(bheap_prio_t higher_prio,
struct bheap* heap,
struct bheap_node* node);
/* merge addition into target */
void bheap_union(bheap_prio_t higher_prio,
struct bheap* target,
struct bheap* addition);
struct bheap_node* bheap_peek(bheap_prio_t higher_prio,
struct bheap* heap);
struct bheap_node* bheap_take(bheap_prio_t higher_prio,
struct bheap* heap);
void bheap_uncache_min(bheap_prio_t higher_prio, struct bheap* heap);
int bheap_decrease(bheap_prio_t higher_prio, struct bheap_node* node);
void bheap_delete(bheap_prio_t higher_prio,
struct bheap* heap,
struct bheap_node* node);
/* allocate from memcache */
struct bheap_node* bheap_node_alloc(int gfp_flags);
void bheap_node_free(struct bheap_node* hn);
/* allocate a heap node for value and insert into the heap */
int bheap_add(bheap_prio_t higher_prio, struct bheap* heap,
void* value, int gfp_flags);
void* bheap_take_del(bheap_prio_t higher_prio,
struct bheap* heap);
#endif
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