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88 lines
3.4 KiB
C
88 lines
3.4 KiB
C
/* Copyright (C) 2010 Monty Program Ab
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All Rights reserved
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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<COPYRIGHT HOLDER> BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.
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*/
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/*
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Code for general handling of priority Queues.
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Implementation of queues from "Algorithms in C" by Robert Sedgewick.
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*/
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#ifndef _queues_h
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#define _queues_h
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#include <my_cmp.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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uchar **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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uint offset_to_queue_pos; /* If we want to store position in element */
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uint auto_extent;
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int max_at_top; /* Normally 1, set to -1 if queue_top gives max */
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qsort_cmp2 compare;
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} QUEUE;
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#define queue_first_element(queue) 1
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#define queue_last_element(queue) (queue)->elements
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#define queue_empty(queue) ((queue)->elements == 0)
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#define queue_top(queue) ((queue)->root[1])
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#define queue_element(queue,index) ((queue)->root[index])
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#define queue_end(queue) ((queue)->root[(queue)->elements])
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#define queue_replace_top(queue) _downheap(queue, 1)
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#define queue_set_cmp_arg(queue, set_arg) (queue)->first_cmp_arg= set_arg
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#define queue_set_max_at_top(queue, set_arg) \
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(queue)->max_at_top= set_arg ? -1 : 1
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#define queue_remove_top(queue_arg) queue_remove((queue_arg), queue_first_element(queue_arg))
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int init_queue(QUEUE *queue,uint max_elements,uint offset_to_key,
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my_bool max_at_top, qsort_cmp2 compare,
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void *first_cmp_arg, uint offset_to_queue_pos,
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uint auto_extent);
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int reinit_queue(QUEUE *queue,uint max_elements,uint offset_to_key,
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my_bool max_at_top, qsort_cmp2 compare,
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void *first_cmp_arg, uint offset_to_queue_pos,
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uint auto_extent);
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int resize_queue(QUEUE *queue, uint max_elements);
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void delete_queue(QUEUE *queue);
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void queue_insert(QUEUE *queue, uchar *element);
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int queue_insert_safe(QUEUE *queue, uchar *element);
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uchar *queue_remove(QUEUE *queue,uint idx);
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void queue_replace(QUEUE *queue,uint idx);
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#define queue_remove_all(queue) { (queue)->elements= 0; }
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#define queue_is_full(queue) ((queue)->elements == (queue)->max_elements)
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void _downheap(QUEUE *queue, uint idx);
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void queue_fix(QUEUE *queue);
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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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