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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2008 VMware, Inc.
  4.  * All Rights Reserved.
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining a
  7.  * copy of this software and associated documentation files (the
  8.  * "Software"), to deal in the Software without restriction, including
  9.  * without limitation the rights to use, copy, modify, merge, publish,
  10.  * distribute, sub license, and/or sell copies of the Software, and to
  11.  * permit persons to whom the Software is furnished to do so, subject to
  12.  * the following conditions:
  13.  *
  14.  * The above copyright notice and this permission notice (including the
  15.  * next paragraph) shall be included in all copies or substantial portions
  16.  * of the Software.
  17.  *
  18.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20.  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21.  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22.  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23.  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24.  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25.  *
  26.  **************************************************************************/
  27.  
  28. /**
  29.  * @file
  30.  * Simple cache.
  31.  *
  32.  * @author Jose Fonseca <jfonseca@vmware.com>
  33.  */
  34.  
  35. #ifndef U_CACHE_H_
  36. #define U_CACHE_H_
  37.  
  38.  
  39. #include "pipe/p_compiler.h"
  40.  
  41.  
  42. #ifdef __cplusplus
  43. extern "C" {
  44. #endif
  45.  
  46.    
  47. /**
  48.  * Least Recently Used (LRU) cache.
  49.  */
  50. struct util_cache;
  51.  
  52.  
  53. /**
  54.  * Create a cache.
  55.  *
  56.  * @param hash hash function
  57.  * @param compare should return 0 for two equal keys
  58.  * @param destroy destruction callback (optional)
  59.  * @param size maximum number of entries
  60.  */
  61. struct util_cache *
  62. util_cache_create(uint32_t (*hash)(const void *key),
  63.                   int (*compare)(const void *key1, const void *key2),
  64.                   void (*destroy)(void *key, void *value),
  65.                   uint32_t size);
  66.  
  67. void
  68. util_cache_set(struct util_cache *cache,
  69.                void *key,
  70.                void *value);
  71.  
  72. void *
  73. util_cache_get(struct util_cache *cache,
  74.                const void *key);
  75.  
  76. void
  77. util_cache_clear(struct util_cache *cache);
  78.  
  79. void
  80. util_cache_destroy(struct util_cache *cache);
  81.  
  82. void
  83. util_cache_remove(struct util_cache *cache,
  84.                   const void *key);
  85.  
  86.  
  87. #ifdef __cplusplus
  88. }
  89. #endif
  90.  
  91. #endif /* U_CACHE_H_ */
  92.