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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA */
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/*
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Code for generell handling of priority Queues.
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Implemention of queues from "Algoritms in C" by Robert Sedgewick.
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Copyright Monty Program KB.
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By monty.
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*/
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#ifndef _queues_h
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#define _queues_h
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct st_queue {
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byte **root;
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void *first_cmp_arg;
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uint elements;
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uint max_elements;
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uint offset_to_key; /* compare is done on element+offset */
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int max_at_top; /* Set if queue_top gives max */
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int (*compare)(void *, byte *,byte *);
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} QUEUE;
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#define queue_top(queue) ((queue)->root[1])
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#define queue_element(queue,index) ((queue)->root[index+1])
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#define queue_end(queue) ((queue)->root[(queue)->elements])
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#define queue_replaced(queue) _downheap(queue,1)
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int init_queue(QUEUE *queue,uint max_elements,uint offset_to_key,
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pbool max_at_top, int (*compare)(void *,byte *, byte *),
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void *first_cmp_arg);
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int reinit_queue(QUEUE *queue,uint max_elements,uint offset_to_key,
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pbool max_at_top, int (*compare)(void *,byte *, byte *),
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void *first_cmp_arg);
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void delete_queue(QUEUE *queue);
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void queue_insert(QUEUE *queue,byte *element);
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byte *queue_remove(QUEUE *queue,uint idx);
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void _downheap(QUEUE *queue,uint idx);
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#define is_queue_inited(queue) ((queue)->root != 0)
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#ifdef __cplusplus
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}
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#endif
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#endif
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