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#ifdef __cplusplus
extern "C" {
#endif
/*
* gdcache.h
*
* 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@graphviz.org) 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 */
/*********************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#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);
#ifdef __cplusplus
}
#endif