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104 lines
3.7 KiB
C
104 lines
3.7 KiB
C
/*
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** SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
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** Copyright (C) [dates of first publication] Silicon Graphics, Inc.
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** All Rights Reserved.
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**
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** Permission is hereby granted, free of charge, to any person obtaining a copy
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** of this software and associated documentation files (the "Software"), to deal
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** in the Software without restriction, including without limitation the rights
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** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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** of the Software, and to permit persons to whom the Software is furnished to do so,
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** subject to the following conditions:
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**
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** The above copyright notice including the dates of first publication and either this
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** permission notice or a reference to http://oss.sgi.com/projects/FreeB/ shall be
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** included in all copies or substantial portions of the Software.
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**
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** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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** INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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** PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL SILICON GRAPHICS, INC.
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** BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
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** OR OTHER DEALINGS IN THE SOFTWARE.
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**
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** Except as contained in this notice, the name of Silicon Graphics, Inc. shall not
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** be used in advertising or otherwise to promote the sale, use or other dealings in
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** this Software without prior written authorization from Silicon Graphics, Inc.
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*/
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/*
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** Author: Eric Veach, July 1994.
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*/
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#ifndef PRIORITYQ_H
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#define PRIORITYQ_H
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/* The basic operations are insertion of a new key (pqInsert),
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* and examination/extraction of a key whose value is minimum
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* (pqMinimum/pqExtractMin). Deletion is also allowed (pqDelete);
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* for this purpose pqInsert returns a "handle" which is supplied
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* as the argument.
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*
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* An initial heap may be created efficiently by calling pqInsert
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* repeatedly, then calling pqInit. In any case pqInit must be called
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* before any operations other than pqInsert are used.
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*
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* If the heap is empty, pqMinimum/pqExtractMin will return a NULL key.
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* This may also be tested with pqIsEmpty.
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*/
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/* Since we support deletion the data structure is a little more
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* complicated than an ordinary heap. "nodes" is the heap itself;
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* active nodes are stored in the range 1..pq->size. When the
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* heap exceeds its allocated size (pq->max), its size doubles.
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* The children of node i are nodes 2i and 2i+1.
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*
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* Each node stores an index into an array "handles". Each handle
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* stores a key, plus a pointer back to the node which currently
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* represents that key (ie. nodes[handles[i].node].handle == i).
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*/
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typedef void *PQkey;
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typedef int PQhandle;
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typedef struct PriorityQHeap PriorityQHeap;
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#define INV_HANDLE 0x0fffffff
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typedef struct { PQhandle handle; } PQnode;
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typedef struct { PQkey key; PQhandle node; } PQhandleElem;
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struct PriorityQHeap {
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PQnode *nodes;
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PQhandleElem *handles;
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int size, max;
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PQhandle freeList;
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int initialized;
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int (*leq)(PQkey key1, PQkey key2);
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};
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typedef struct PriorityQ PriorityQ;
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struct PriorityQ {
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PriorityQHeap *heap;
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PQkey *keys;
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PQkey **order;
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PQhandle size, max;
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int initialized;
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int (*leq)(PQkey key1, PQkey key2);
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};
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PriorityQ *pqNewPriorityQ( TESSalloc* alloc, int size, int (*leq)(PQkey key1, PQkey key2) );
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void pqDeletePriorityQ( TESSalloc* alloc, PriorityQ *pq );
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int pqInit( TESSalloc* alloc, PriorityQ *pq );
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PQhandle pqInsert( TESSalloc* alloc, PriorityQ *pq, PQkey key );
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PQkey pqExtractMin( PriorityQ *pq );
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void pqDelete( PriorityQ *pq, PQhandle handle );
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PQkey pqMinimum( PriorityQ *pq );
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int pqIsEmpty( PriorityQ *pq );
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#endif
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