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dd83044cad
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/performance/trunk@25488 72102866-910b-0410-8b05-ffd578937521
82 lines
2.3 KiB
Objective-C
82 lines
2.3 KiB
Objective-C
/**
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Copyright (C) 2006 Free Software Foundation, Inc.
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Written by: Matt Rice <ratmice@yahoo.com>
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Date: 2006
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This file is part of the Performance Library.
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 3 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser 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, MA 02111 USA.
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*/
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#import <Foundation/NSZone.h>
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#define GSISLMaxNumberOfLevels 16
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#define GSISLMaxLevel 15
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/*
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* attempt at caching the previously looked up index
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* to reduce the search time required when wantedIndex > previousIndex
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* this didn't seem to provide any benefit, actually negatively impacting
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* performance though it was never thoroughly tested it
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*/
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#define GSISL_CACHE_OPT 0
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typedef id GSISLValueType;
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typedef struct GSISLNode_t *GSISLNode;
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extern GSISLNode GSISLNil;
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struct GSISLForward_t
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{
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unsigned delta;
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GSISLNode next;
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};
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struct GSISLNode_t
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{
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GSISLValueType value;
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struct GSISLForward_t forward[1];
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};
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typedef struct GSIndexedSkipList
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{
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int level; /* Maximum level of the list
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(1 more than the number of levels in the list) */
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GSISLNode header; /* pointer to header */
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unsigned count;
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NSZone *zone;
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#if GSISL_CACHE_OPT
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unsigned indexCache[GSISLMaxNumberOfLevels];
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GSISLNode nodeCache[GSISLMaxNumberOfLevels];
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#endif
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} * GSISList;
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void GSISLInitialize();
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void GSISLFreeList(GSISList l);
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GSISList GSISLInitList(NSZone *zone);
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void GSISLInsertItemAtIndex(GSISList l,
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GSISLValueType value,
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unsigned index);
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GSISLValueType GSISLItemAtIndex(GSISList l, unsigned index);
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GSISLValueType GSISLRemoveItemAtIndex(GSISList l,
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unsigned index);
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GSISLValueType GSISLReplaceItemAtIndex(GSISList l,
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GSISLValueType newVal,
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unsigned index);
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