49 lines
1.7 KiB
C
49 lines
1.7 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* 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 */
|
|
|