128 lines
3.3 KiB
C++
128 lines
3.3 KiB
C++
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/*
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* $Id$
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*
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Copyright (c) 2006-2014 Chung, Hyung-Hwan. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <qse/cmn/Mpool.hpp>
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// TODO: can i use QSE_MMGR_XXXXX instead of ::new and ::delete???
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/////////////////////////////////
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QSE_BEGIN_NAMESPACE(QSE)
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/////////////////////////////////
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Mpool::Mpool (qse_size_t datum_size, qse_size_t block_size)
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{
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if (datum_size > 0 && datum_size < QSE_SIZEOF(void*))
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datum_size = QSE_SIZEOF(void*);
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this->mp_blocks = QSE_NULL;
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this->free_list = QSE_NULL;
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this->datum_size = datum_size;
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this->block_size = block_size;
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#if defined(QSE_DEBUG_MPOOL)
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this->navail = 0;
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this->nalloc = 0;
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#endif
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}
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Mpool::~Mpool ()
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{
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this->dispose ();
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}
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void* Mpool::allocate ()
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{
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if (this->datum_size <= 0 || this->block_size <= 0) return QSE_NULL;
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void* ptr = this->free_list;
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if (!ptr)
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{
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this->add_block ();
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ptr = this->free_list;
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}
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this->free_list = this->free_list->next;
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#if defined(QSE_DEBUG_MPOOL)
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this->navail--;
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#endif
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return ptr;
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}
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void Mpool::dispose (void* ptr)
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{
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((Chain*)ptr)->next = this->free_list;
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this->free_list = (Chain*)ptr;
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#if defined(QSE_DEBUG_MPOOL)
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this->navail++;
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#endif
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}
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void Mpool::dispose ()
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{
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Block* block = this->mp_blocks;
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while (block)
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{
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Block* next = block->next;
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::delete[] block;
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block = next;
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}
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this->free_list = QSE_NULL;
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this->mp_blocks = QSE_NULL;
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#if defined(QSE_DEBUG_MPOOL)
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this->navail = 0;
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this->nalloc = 0;
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#endif
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}
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void Mpool::add_block ()
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{
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QSE_ASSERT (this->datum_size > 0 && this->block_size > 0);
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Block* block = (Block*)::new qse_uint8_t[
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QSE_SIZEOF(Block) + this->block_size * this->datum_size];
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//this->free_list = (Chain*)block->data;
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this->free_list = (Chain*)(block + 1);
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Chain* ptr = this->free_list;
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for (qse_size_t i = 0; i < this->block_size - 1; i++)
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{
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Chain* next = (Chain*)((qse_uint8_t*)ptr + this->datum_size);
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ptr->next = next;
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ptr = next;
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}
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ptr->next = QSE_NULL;
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block->next = this->mp_blocks;
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this->mp_blocks = block;
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#if defined(QSE_DEBUG_MPOOL)
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this->navail += this->block_size;
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this->nalloc += this->block_size;
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#endif
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}
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/////////////////////////////////
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QSE_END_NAMESPACE(QSE)
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/////////////////////////////////
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