lib/pqueue.h

   1 /* Priority queue functions.
   2  * Copyright (C) 2003 Yasuhiro Ohara
   3  *
   4  * This file is part of GNU Zebra.
   5  *
   6  * GNU Zebra is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published
   8  * by the Free Software Foundation; either version 2, or (at your
   9  * option) any later version.
  10  *
  11  * GNU Zebra is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; see the file COPYING; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #ifndef _ZEBRA_PQUEUE_H
  22 #define _ZEBRA_PQUEUE_H
  23
  24 struct 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
  36 extern struct pqueue *pqueue_create (void);
  37 extern void pqueue_delete (struct pqueue *queue);
  38
  39 extern void pqueue_enqueue (void *data, struct pqueue *queue);
  40 extern void *pqueue_dequeue (struct pqueue *queue);
  41 extern void pqueue_remove_at (int index, struct pqueue *queue);
  42 extern void pqueue_remove (void *data, struct pqueue *queue);
  43
  44 extern void trickle_down (int index, struct pqueue *queue);
  45 extern void trickle_up (int index, struct pqueue *queue);
  46
  47 #endif /* _ZEBRA_PQUEUE_H */