47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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*
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* Copyright (C) 2003 Tat Tang
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef LRU_H
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#define LRU_H
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/*******************************************************************************
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* LRU manager
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******************************************************************************/
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struct lru
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{
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short _head;
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short _tail;
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short _size;
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short _slot_size;
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void *_base;
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};
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#define LRU_SLOT_OVERHEAD (2 * sizeof(short))
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/* Create LRU list with specified size from buf. */
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void lru_create(struct lru* pl, void *buf, short size, short data_size);
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/* Touch an entry. Moves handle to back of LRU list */
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void lru_touch(struct lru* pl, short handle);
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/* Data */
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void *lru_data(struct lru* pl, short handle);
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/* Traverse lru-wise */
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void lru_traverse(struct lru* pl, void (*callback)(void* data));
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#endif /* LRU_H */
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