60 lines
1.9 KiB
C++
60 lines
1.9 KiB
C++
/*
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* Copyright (c) 1999-2008 Apple Inc. All Rights Reserved.
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*
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*/
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/*
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File: OSBufferPool.cpp
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Contains: Fast access to fixed size buffers.
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Written By: Denis Serenyi
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*/
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#include "OSBufferPool.h"
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#include "OSMemory.h"
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void* OSBufferPool::Get()
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{
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OSMutexLocker locker(&fMutex);
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if (fQueue.GetLength() == 0)
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{
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fTotNumBuffers++;
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char* theNewBuf = NEW char[fBufSize + sizeof(OSQueueElem)];
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//
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// We need to construct a Queue Element, but we don't actually need
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// to use it in this function, so to avoid a compiler warning just
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// don't assign the result to anything.
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(void)new (theNewBuf) OSQueueElem(theNewBuf + sizeof(OSQueueElem));
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return theNewBuf + sizeof(OSQueueElem);
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}
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return fQueue.DeQueue()->GetEnclosingObject();
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}
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void OSBufferPool::Put(void* inBuffer)
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{
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OSMutexLocker locker(&fMutex);
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fQueue.EnQueue((OSQueueElem*)((char*)inBuffer - sizeof(OSQueueElem)));
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}
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