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MemoryPool.cpp
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executable file
·84 lines (67 loc) · 1.42 KB
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//
// MemoryPool.cpp
//
// $Id: //poco/1.4/Foundation/src/MemoryPool.cpp#1 $
//
// Library: Foundation
// Package: Core
// Module: MemoryPool
//
// Copyright (c) 2005-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#include "Poco/MemoryPool.h"
#include "Poco/Exception.h"
namespace Poco {
MemoryPool::MemoryPool(std::size_t blockSize, int preAlloc, int maxAlloc):
_blockSize(blockSize),
_maxAlloc(maxAlloc),
_allocated(preAlloc)
{
poco_assert (maxAlloc == 0 || maxAlloc >= preAlloc);
poco_assert (preAlloc >= 0 && maxAlloc >= 0);
int r = BLOCK_RESERVE;
if (preAlloc > r)
r = preAlloc;
if (maxAlloc > 0 && maxAlloc < r)
r = maxAlloc;
_blocks.reserve(r);
for (int i = 0; i < preAlloc; ++i)
{
_blocks.push_back(new char[_blockSize]);
}
}
MemoryPool::~MemoryPool()
{
for (BlockVec::iterator it = _blocks.begin(); it != _blocks.end(); ++it)
{
delete [] *it;
}
}
void* MemoryPool::get()
{
FastMutex::ScopedLock lock(_mutex);
if (_blocks.empty())
{
if (_maxAlloc == 0 || _allocated < _maxAlloc)
{
++_allocated;
return new char[_blockSize];
}
else throw OutOfMemoryException("MemoryPool exhausted");
}
else
{
char* ptr = _blocks.back();
_blocks.pop_back();
return ptr;
}
}
void MemoryPool::release(void* ptr)
{
FastMutex::ScopedLock lock(_mutex);
_blocks.push_back(reinterpret_cast<char*>(ptr));
}
} // namespace Poco