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Edit File : gdcache.h \| Size : 2.75 KB
/* * $Id$ * * Caches of pointers to user structs in which the least-recently-used * element is replaced in the event of a cache miss after the cache has * reached a given size. * * John Ellson (ellson@lucent.com) Oct 31, 1997 * * Test this with: * gcc -o gdcache -g -Wall -DTEST gdcache.c * * The cache is implemented by a singly-linked list of elements * each containing a pointer to a user struct that is being managed by * the cache. * * The head structure has a pointer to the most-recently-used * element, and elements are moved to this position in the list each * time they are used. The head also contains pointers to three * user defined functions: * - a function to test if a cached userdata matches some keydata * - a function to provide a new userdata struct to the cache * if there has been a cache miss. * - a function to release a userdata struct when it is * no longer being managed by the cache * * In the event of a cache miss the cache is allowed to grow up to * a specified maximum size. After the maximum size is reached then * the least-recently-used element is discarded to make room for the * new. The most-recently-returned value is always left at the * beginning of the list after retrieval. * * In the current implementation the cache is traversed by a linear * search from most-recent to least-recent. This linear search * probably limits the usefulness of this implementation to cache * sizes of a few tens of elements. / /*******************************************************/ / header / /*******************************************************/ #if (!defined(_OSD_POSIX) && !defined(__FreeBSD__)) && HAVE_MALLOC_H #include <malloc.h> #else #include <stdlib.h> / BS2000/OSD defines malloc() & friends in stdlib.h / #endif #ifndef NULL #define NULL (void )0 #endif /* user defined function templates / typedef int (gdCacheTestFn_t)(void userdata, void keydata); typedef void (gdCacheFetchFn_t)(char *error, void keydata); typedef void (gdCacheReleaseFn_t)(void userdata); /* element structure / typedef struct gdCache_element_s gdCache_element_t; struct gdCache_element_s { gdCache_element_t next; void userdata; }; / head structure / typedef struct gdCache_head_s gdCache_head_t; struct gdCache_head_s { gdCache_element_t mru; int size; char error; gdCacheTestFn_t gdCacheTest; gdCacheFetchFn_t gdCacheFetch; gdCacheReleaseFn_t gdCacheRelease; }; / function templates / gdCache_head_t gdCacheCreate( int size, gdCacheTestFn_t gdCacheTest, gdCacheFetchFn_t gdCacheFetch, gdCacheReleaseFn_t gdCacheRelease ); void gdCacheDelete( gdCache_head_t head ); void gdCacheGet( gdCache_head_t head, void keydata ); Back

Edit File : gdcache.h | Size : 2.75 KB

/*
 * $Id$
 *
 * Caches of pointers to user structs in which the least-recently-used
 * element is replaced in the event of a cache miss after the cache has
 * reached a given size.
 *
 * John Ellson  (ellson@lucent.com)  Oct 31, 1997
 *
 * Test this with:
 *		 gcc -o gdcache -g -Wall -DTEST gdcache.c
 *
 * The cache is implemented by a singly-linked list of elements
 * each containing a pointer to a user struct that is being managed by
 * the cache.
 *
 * The head structure has a pointer to the most-recently-used
 * element, and elements are moved to this position in the list each
 * time they are used.  The head also contains pointers to three
 * user defined functions:
 *		- a function to test if a cached userdata matches some keydata
 *		- a function to provide a new userdata struct to the cache
 *          if there has been a cache miss.
 *		- a function to release a userdata struct when it is
 *          no longer being managed by the cache
 *
 * In the event of a cache miss the cache is allowed to grow up to
 * a specified maximum size.  After the maximum size is reached then
 * the least-recently-used element is discarded to make room for the
 * new.  The most-recently-returned value is always left at the
 * beginning of the list after retrieval.
 *
 * In the current implementation the cache is traversed by a linear
 * search from most-recent to least-recent.  This linear search
 * probably limits the usefulness of this implementation to cache
 * sizes of a few tens of elements.
 */

/*********************************************************/
/* header                                                */
/*********************************************************/

#if (!defined(_OSD_POSIX) && !defined(__FreeBSD__)) && HAVE_MALLOC_H
#include <malloc.h>
#else
#include <stdlib.h> /* BS2000/OSD defines malloc() & friends in stdlib.h */
#endif
#ifndef NULL
#define NULL (void *)0
#endif

/* user defined function templates */
typedef int (*gdCacheTestFn_t)(void *userdata, void *keydata);
typedef void *(*gdCacheFetchFn_t)(char **error, void *keydata);
typedef void (*gdCacheReleaseFn_t)(void *userdata);

/* element structure */
typedef struct gdCache_element_s gdCache_element_t;
struct gdCache_element_s {
	gdCache_element_t	*next;
	void			*userdata;
};

/* head structure */
typedef struct gdCache_head_s gdCache_head_t;
struct gdCache_head_s {
	gdCache_element_t	*mru;
	int					size;
	char				*error;
	gdCacheTestFn_t		gdCacheTest;
	gdCacheFetchFn_t	gdCacheFetch;
	gdCacheReleaseFn_t	gdCacheRelease;
};

/* function templates */
gdCache_head_t *
gdCacheCreate(
	int					size,
	gdCacheTestFn_t		gdCacheTest,
	gdCacheFetchFn_t	gdCacheFetch,
	gdCacheReleaseFn_t	gdCacheRelease );

void
gdCacheDelete( gdCache_head_t *head );

void *
gdCacheGet( gdCache_head_t *head, void *keydata );

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