dmmlib/private-include/freelist/linked_lists/search_algorithms.h

/*
 *   Copyright 2011 Institute of Communication and Computer Systems (ICCS) 
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 *
 */

/**
 * \file 	search_algorithms.h
 * \author 	Ioannis Koutras (joko@microlab.ntua.gr)
 * \date 	September, 2011
 *  
 * \brief Various search algorithms for linked list structures used on DMMLib.
 */

#ifndef LINKED_LISTS_SEARCH_ALGORITHMS_H
#define LINKED_LISTS_SEARCH_ALGORITHMS_H
#include "dmm_config.h"
#include "freelist/freelist_rb.h"

/**
 * Perform a best-fit search on free lists for a block of a certain size
 *
 * \param raw_block The raw block whose fixed list should be accessed.
 * \param requested_size The desired size of the block.
 *
 * \return The pointer of the data part of the matched memory block.
 * \retval NULL No block was found.
 */
block_header_t * best_fit_on_freelist(freelist_rb_t *raw_block, size_t requested_size);

#ifdef GOOD_FIT

/**
 * Perform a good-fit search on the free list
 *
 * \param raw_block The raw block whose fixed list should be accessed.
 * \param requested_size The desired size of the block.
 *
 * \return The pointer to the data part of the matched memory block.
 * \retval NULL No block was found.
 */
block_header_t * good_fit_on_freelist(freelist_rb_t *raw_block, size_t requested_size);

#endif /* GOOD_FIT */

/**
 * Perform an exact-fit search on free lists for a block of a certain size
 *
 * \param raw_block The raw block whose fixed list should be accessed.
 * \param requested_size The desired size of the block.
 *
 * \return The pointer of the data part of the matched memory block.
 * \retval NULL No block was found.
 */
block_header_t * exact_fit_on_freelist(freelist_rb_t *raw_block, size_t requested_size);

/**
 * Perform a first-fit search on free lists for a block of a certain size
 *
 * \param raw_block The raw block whose fixed list should be accessed.
 * \param requested_size The desired size of the block.
 *
 * \return The pointer of the data part of the matched memory block.
 * \retval NULL No block was found.
 */
block_header_t * first_fit_on_freelist(freelist_rb_t *raw_block, size_t requested_size);

#endif /* LINKED_LISTS_SEARCH_ALGORITHMS_H */