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123 lines
2.9 KiB
C++
123 lines
2.9 KiB
C++
/* Copyright (C) 2014 InfiniDB, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/******************************************************************************************
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* $Id$
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*
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******************************************************************************************/
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//This is one of the first files we compile, check the compiler...
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#if defined(__GNUC__)
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#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 1)
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#error "This is a very old GCC, and it's probably not going to work."
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#endif
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#elif defined(_MSC_VER)
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#else
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#error "This compiler is not known and it's probably not going to work."
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#endif
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#include <stdint.h>
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#include <iostream>
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#define FIXEDALLOCATOR_DLLEXPORT
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#include "fixedallocator.h"
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#undef FIXEDALLOCATOR_DLLEXPORT
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using namespace std;
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using namespace boost;
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namespace utils {
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FixedAllocator::FixedAllocator(const FixedAllocator &f)
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{
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elementCount = f.elementCount;
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elementSize = f.elementSize;
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tmpSpace = f.tmpSpace;
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capacityRemaining = 0;
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currentlyStored = 0;
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}
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FixedAllocator & FixedAllocator::operator=(const FixedAllocator &f)
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{
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elementCount = f.elementCount;
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elementSize = f.elementSize;
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tmpSpace = f.tmpSpace;
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deallocateAll();
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return *this;
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}
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void FixedAllocator::newBlock()
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{
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shared_array<uint8_t> next;
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capacityRemaining = elementCount * elementSize;
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if (!tmpSpace || mem.size() == 0) {
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next.reset(new uint8_t[elementCount * elementSize]);
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mem.push_back(next);
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nextAlloc = next.get();
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}
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else {
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currentlyStored = 0;
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nextAlloc = mem.front().get();
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}
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}
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void * FixedAllocator::allocate()
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{
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void *ret;
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if (capacityRemaining < elementSize)
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newBlock();
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ret = nextAlloc;
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nextAlloc += elementSize;
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capacityRemaining -= elementSize;
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currentlyStored += elementSize;
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return ret;
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}
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void * FixedAllocator::allocate(uint32_t len)
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{
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void *ret;
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if (capacityRemaining < len)
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newBlock();
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ret = nextAlloc;
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nextAlloc += len;
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capacityRemaining -= len;
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currentlyStored += len;
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return ret;
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}
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void FixedAllocator::truncateBy(uint32_t amt)
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{
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nextAlloc -= amt;
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capacityRemaining += amt;
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currentlyStored -= amt;
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}
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void FixedAllocator::deallocateAll()
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{
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mem.clear();
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currentlyStored = 0;
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capacityRemaining = 0;
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}
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uint64_t FixedAllocator::getMemUsage() const
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{
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return (mem.size() * elementCount * elementSize);
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}
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}
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