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git-svn-id: file:///srv/svn/repos/haiku/trunk/current@1731 a95241bf-73f2-0310-859d-f6bbb57e9c96
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@ -1,42 +1,67 @@
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//------------------------------------------------------------------------------
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// Copyright (c) 2001-2002, OpenBeOS
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//
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// File: BlockCache.cpp
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// Description: Handles a cache of memory blocks of the same size
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// Copyright (c) 2002 Massimiliano Origgi
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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// License: See MIT license
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// File Name: String.cpp
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// Author(s): Massimiliano Origgi
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//
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// Description: Handles a cache of memory blocks of the same size
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//------------------------------------------------------------------------------
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#include <BlockCache.h>
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#include <Autolock.h>
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// Standard Includes -----------------------------------------------------------
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#include <stdlib.h>
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// System Includes -------------------------------------------------------------
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#include <Autolock.h>
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#include <BlockCache.h>
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// Private functions
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void *object_alloc(size_t Size)
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static void *
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object_alloc(size_t Size)
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{
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return (void *)(new char[Size]);
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}
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void object_free(void *Data)
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static void
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object_free(void *Data)
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{
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delete[] Data;
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}
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void *malloc_alloc(size_t Size)
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static void*
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malloc_alloc(size_t Size)
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{
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return malloc(Size);
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}
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void malloc_free(void *Data)
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static void
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malloc_free(void *Data)
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{
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free(Data);
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}
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// Private structure for cache
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struct _Block
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{
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@ -46,36 +71,38 @@ struct _Block
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bool InUse;
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};
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_Block::_Block(void) :
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Data(NULL),
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InUse(false)
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{
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}
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_Block::~_Block(void)
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{
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}
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BBlockCache::BBlockCache(size_t CacheSize, size_t BlockSize, uint32 Type) :
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fCacheSize(CacheSize),
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fBlockSize(BlockSize),
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fMark(0)
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BBlockCache::BBlockCache(size_t CacheSize, size_t BlockSize, uint32 Type)
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: fCacheSize(CacheSize),
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fBlockSize(BlockSize),
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fMark(0)
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{
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// Setup function pointers based on Type
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if(Type==B_OBJECT_CACHE) {
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fAlloc=&object_alloc;
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fFree=&object_free;
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if(Type == B_OBJECT_CACHE) {
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fAlloc = &object_alloc;
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fFree = &object_free;
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} else {
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fAlloc=&malloc_alloc;
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fFree=&malloc_free;
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fAlloc = &malloc_alloc;
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fFree = &malloc_free;
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}
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// Allocate cache
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fCache=(void *)new _Block[CacheSize];
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for(size_t i=0; i<CacheSize; i++) {
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((_Block *)fCache)[i].Data=fAlloc(BlockSize);
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}
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fCache = (void *)new _Block[CacheSize];
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for(size_t i = 0; i < CacheSize; i++)
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((_Block *)fCache)[i].Data = fAlloc(BlockSize);
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}
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@ -84,34 +111,37 @@ BBlockCache::~BBlockCache()
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delete[] fCache;
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}
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void *
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BBlockCache::Get(size_t BlockSize)
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{
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BAutolock lock(fLock);
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if(BlockSize!=fBlockSize) {
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if(BlockSize != fBlockSize)
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return fAlloc(BlockSize);
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}
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_Block *block;
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for(size_t i=fMark; i<fCacheSize; i++) {
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block=&((_Block *)fCache)[i];
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if(block->InUse==false) {
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block->InUse=true;
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for(size_t i = fMark; i < fCacheSize; i++) {
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block = &((_Block *)fCache)[i];
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if(block->InUse == false) {
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block->InUse = true;
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++fMark;
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if(fMark==fCacheSize) fMark=0;
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if(fMark == fCacheSize)
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fMark = 0;
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return block->Data;
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}
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}
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if(fMark==0) return fAlloc(BlockSize);
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if(fMark == 0)
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return fAlloc(BlockSize);
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for(size_t i=0; i<fMark; i++) {
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block=&((_Block *)fCache)[i];
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if(block->InUse==false) {
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block->InUse=true;
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for(size_t i = 0; i < fMark; i++) {
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block = &((_Block *)fCache)[i];
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if(block->InUse == false) {
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block->InUse = true;
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++fMark;
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if(fMark==fCacheSize) fMark=0;
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if(fMark == fCacheSize)
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fMark = 0;
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return block->Data;
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}
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}
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@ -119,22 +149,23 @@ BBlockCache::Get(size_t BlockSize)
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return fAlloc(BlockSize);
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}
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void
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BBlockCache::Save(void *Data, size_t BlockSize)
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{
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BAutolock lock(fLock);
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if(BlockSize!=fBlockSize) {
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if(BlockSize != fBlockSize) {
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fFree(Data);
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return;
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}
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_Block *block;
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for(size_t i=0; i<fCacheSize; i++) {
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block=&((_Block *)fCache)[i];
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if(block->Data==Data) {
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block->InUse=false;
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fMark=i;
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for(size_t i = 0; i < fCacheSize; i++) {
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block = &((_Block *)fCache)[i];
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if(block->Data == Data) {
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block->InUse = false;
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fMark = i;
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return;
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}
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}
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