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105 lines
2.7 KiB
C++
105 lines
2.7 KiB
C++
//
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// MemoryPool.cpp
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//
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// $Id: //poco/svn/Foundation/src/MemoryPool.cpp#2 $
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//
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// Library: Foundation
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// Package: Core
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// Module: MemoryPool
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//
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// Copyright (c) 2005-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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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, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING 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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#include "Poco/MemoryPool.h"
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#include "Poco/Exception.h"
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namespace Poco {
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MemoryPool::MemoryPool(std::size_t blockSize, int preAlloc, int maxAlloc):
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_blockSize(blockSize),
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_maxAlloc(maxAlloc),
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_allocated(preAlloc)
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{
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poco_assert (maxAlloc == 0 || maxAlloc >= preAlloc);
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poco_assert (preAlloc >= 0 && maxAlloc >= 0);
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int r = BLOCK_RESERVE;
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if (preAlloc > r)
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r = preAlloc;
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if (maxAlloc > 0 && maxAlloc < r)
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r = maxAlloc;
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_blocks.reserve(r);
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for (int i = 0; i < preAlloc; ++i)
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{
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_blocks.push_back(new char[_blockSize]);
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}
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}
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MemoryPool::~MemoryPool()
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{
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for (BlockVec::iterator it = _blocks.begin(); it != _blocks.end(); ++it)
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{
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delete [] *it;
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}
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}
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void* MemoryPool::get()
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{
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FastMutex::ScopedLock lock(_mutex);
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if (_blocks.empty())
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{
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if (_maxAlloc == 0 || _allocated < _maxAlloc)
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{
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++_allocated;
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return new char[_blockSize];
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}
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else throw OutOfMemoryException("MemoryPool exhausted");
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}
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else
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{
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char* ptr = _blocks.back();
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_blocks.pop_back();
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return ptr;
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}
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}
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void MemoryPool::release(void* ptr)
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{
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FastMutex::ScopedLock lock(_mutex);
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_blocks.push_back(reinterpret_cast<char*>(ptr));
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}
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} // namespace Poco
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