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34 /* Size of cache keys in bytes. */
35 #define CACHE_KEY_SIZE 20
37 typedef uint8_t cache_key
[CACHE_KEY_SIZE
];
41 /* Provide inlined stub functions if the shader cache is disabled. */
43 #ifdef ENABLE_SHADER_CACHE
46 * Create a new cache object.
48 * This function creates the handle necessary for all subsequent cache_*
51 * This cache provides two distinct operations:
53 * o Storage and retrieval of arbitrary objects by cryptographic
54 * name (or "key"). This is provided via disk_cache_put() and
57 * o The ability to store a key alone and check later whether the
58 * key was previously stored. This is provided via disk_cache_put_key()
59 * and disk_cache_has_key().
61 * The put_key()/has_key() operations are conceptually identical to
62 * put()/get() with no data, but are provided separately to allow for
63 * a more efficient implementation.
65 * In all cases, the keys are sequences of 20 bytes. It is anticipated
66 * that callers will compute appropriate SHA-1 signatures for keys,
67 * (though nothing in this implementation directly relies on how the
68 * names are computed). See mesa-sha1.h and _mesa_sha1_compute for
69 * assistance in computing SHA-1 signatures.
72 disk_cache_create(void);
75 * Destroy a cache object, (freeing all associated resources).
78 disk_cache_destroy(struct disk_cache
*cache
);
81 * Store an item in the cache under the name \key.
83 * The item can be retrieved later with disk_cache_get(), (unless the item has
84 * been evicted in the interim).
86 * Any call to disk_cache_put() may cause an existing, random item to be
87 * evicted from the cache.
90 disk_cache_put(struct disk_cache
*cache
, cache_key key
,
91 const void *data
, size_t size
);
94 * Retrieve an item previously stored in the cache with the name <key>.
96 * The item must have been previously stored with a call to disk_cache_put().
98 * If \size is non-NULL, then, on successful return, it will be set to the
101 * \return A pointer to the stored object if found. NULL if the object
102 * is not found, or if any error occurs, (memory allocation failure,
103 * filesystem error, etc.). The returned data is malloc'ed so the
104 * caller should call free() it when finished.
107 disk_cache_get(struct disk_cache
*cache
, cache_key key
, size_t *size
);
110 * Store the name \key within the cache, (without any associated data).
112 * Later this key can be checked with disk_cache_has_key(), (unless the key
113 * has been evicted in the interim).
115 * Any call to cache_record() may cause an existing, random key to be
116 * evicted from the cache.
119 disk_cache_put_key(struct disk_cache
*cache
, cache_key key
);
122 * Test whether the name \key was previously recorded in the cache.
124 * Return value: True if disk_cache_put_key() was previously called with
125 * \key, (and the key was not evicted in the interim).
127 * Note: disk_cache_has_key() will only return true for keys passed to
128 * disk_cache_put_key(). Specifically, a call to disk_cache_put() will not cause
129 * disk_cache_has_key() to return true for the same key.
132 disk_cache_has_key(struct disk_cache
*cache
, cache_key key
);
136 static inline struct disk_cache
*
137 disk_cache_create(void)
143 disk_cache_destroy(struct disk_cache
*cache
) {
148 disk_cache_put(struct disk_cache
*cache
, cache_key key
,
149 const void *data
, size_t size
)
154 static inline uint8_t *
155 disk_cache_get(struct disk_cache
*cache
, cache_key key
, size_t *size
)
161 disk_cache_put_key(struct disk_cache
*cache
, cache_key key
)
167 disk_cache_has_key(struct disk_cache
*cache
, cache_key key
)
172 #endif /* ENABLE_SHADER_CACHE */