1/* Priority queue functions.
2   Copyright (C) 2003 Yasuhiro Ohara
3
4This file is part of GNU Zebra.
5
6GNU Zebra is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published
8by the Free Software Foundation; either version 2, or (at your
9option) any later version.
10
11GNU Zebra is distributed in the hope that it will be useful, but
12WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with GNU Zebra; see the file COPYING.  If not, write to the
18Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19Boston, MA 02111-1307, USA.  */
20
21#ifndef _ZEBRA_PQUEUE_H
22#define _ZEBRA_PQUEUE_H
23
24struct pqueue
25{
26  void **array;
27  int array_size;
28  int size;
29
30  int (*cmp) (void *, void *);
31  void (*update) (void * node, int actual_position);
32};
33
34#define PQUEUE_INIT_ARRAYSIZE  32
35
36extern struct pqueue *pqueue_create (void);
37extern void pqueue_delete (struct pqueue *queue);
38
39extern void pqueue_enqueue (void *data, struct pqueue *queue);
40extern void *pqueue_dequeue (struct pqueue *queue);
41extern void pqueue_remove_at (int index, struct pqueue *queue);
42
43extern void trickle_down (int index, struct pqueue *queue);
44extern void trickle_up (int index, struct pqueue *queue);
45
46#endif /* _ZEBRA_PQUEUE_H */
47