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Keir Fraser
45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
/*
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* cache.h
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*
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* In-memory data cache.
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*
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* Written & released by Keir Fraser <keir.xen@gmail.com>
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*
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* This is free and unencumbered software released into the public domain.
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* See the file COPYING for more details, or visit <http://unlicense.org>.
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*/
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#if TARGET != TARGET_bootloader
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/* Use memory range (@start,@end) to cache data items of size @item_sz. */
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struct cache *cache_init(void *start, void *end, unsigned int item_sz);
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/* Look up item @id in the cache. Return a pointer to cached data, or NULL. */
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const void *cache_lookup(struct cache *c, uint32_t id);
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/* Update item @id with data @dat. Inserts the item if not present.*/
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void cache_update(struct cache *c, uint32_t id, const void *dat);
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/* Update @N items (@id..@id+@N-1) with data @dat. Calls cache_update(). */
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void cache_update_N(struct cache *c, uint32_t id,
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const void *dat, unsigned int N);
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#else
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#define cache_init(a,b,c) NULL
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#define cache_lookup(a,b) NULL
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#define cache_update(a,b,c) ((void)0)
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#define cache_update_N(a,b,c,d) ((void)0)
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#endif
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/*
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* Local variables:
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* mode: C
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* c-file-style: "Linux"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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