/* Priority queue functions.
 * Copyright (C) 2003 Yasuhiro Ohara
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra 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, or (at your
 * option) any later version.
 *
 * GNU Zebra 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; see the file COPYING; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef _ZEBRA_PQUEUE_H
#define _ZEBRA_PQUEUE_H

struct pqueue
{
  void **array;
  int array_size;
  int size;

  int (*cmp) (void *, void *);
  void (*update) (void * node, int actual_position);
};

#define PQUEUE_INIT_ARRAYSIZE  32

extern struct pqueue *pqueue_create (void);
extern void pqueue_delete (struct pqueue *queue);

extern void pqueue_enqueue (void *data, struct pqueue *queue);
extern void *pqueue_dequeue (struct pqueue *queue);
extern void pqueue_remove_at (int index, struct pqueue *queue);
extern void pqueue_remove (void *data, struct pqueue *queue);

extern void trickle_down (int index, struct pqueue *queue);
extern void trickle_up (int index, struct pqueue *queue);

#endif /* _ZEBRA_PQUEUE_H */