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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
*
* Copyright (C) 2003 Tat Tang
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#ifndef LRU_H
#define LRU_H
/*******************************************************************************
* LRU manager
******************************************************************************/
struct lru
{
short _head;
short _tail;
short _size;
short _slot_size;
void *_base;
};
#define LRU_SLOT_OVERHEAD (2 * sizeof(short))
/* Create LRU list with specified size from buf. */
void lru_create(struct lru* pl, void *buf, short size, short data_size);
/* Touch an entry. Moves handle to back of LRU list */
void lru_touch(struct lru* pl, short handle);
/* Data */
void *lru_data(struct lru* pl, short handle);
/* Traverse lru-wise */
void lru_traverse(struct lru* pl, void (*callback)(void* data));
#endif /* LRU_H */
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