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/*-------------------------------------------------------------------------
* Copyright (C) 1997 National Center for Supercomputing Applications.
* All rights reserved.
*
*-------------------------------------------------------------------------
*
* Created: H5ACprivate.h
* Jul 9 1997
* Robb Matzke <matzke@llnl.gov>
*
* Purpose: Constants and typedefs available to the rest of the
* library.
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
#ifndef _H5ACprivate_H
#define _H5ACprivate_H
#include <H5ACpublic.h> /*public prototypes */
/* Pivate headers needed by this header */
#include <H5private.h>
#include <H5Fprivate.h>
/*
* Class methods pertaining to caching. Each type of cached object will
* have a constant variable with permanent life-span that describes how
* to cache the object. That variable will be of type H5AC_class_t and
* have the following required fields...
*
* LOAD: Loads an object from disk to memory. The function
* should allocate some data structure and return it.
*
* FLUSH: Writes some data structure back to disk. It would be
* wise for the data structure to include dirty flags to
* indicate whether it really needs to be written. This
* function is also responsible for freeing memory allocated
* by the LOAD method if the DEST argument is non-zero.
*/
typedef struct H5AC_class_t {
void *(*load)(hdf5_file_t*, haddr_t addr, const void *udata);
herr_t (*flush)(hdf5_file_t*, hbool_t dest, haddr_t addr,
void *thing);
} H5AC_class_t;
/*
* A cache has a certain number of entries. Objects are mapped into a
* cache entry by hashing the object's file address. Each file has its
* own cache, an array of slots.
*/
#define H5AC_NSLOTS 10330 /*prime number tend to work best */
#define H5AC_HASH(ADDR) ((unsigned)(ADDR) % H5AC_NSLOTS)
typedef struct H5AC_cache_t {
const H5AC_class_t *type; /*type of object stored here */
haddr_t addr; /*file address for object */
void *thing; /*the thing which is cached */
} H5AC_cache_t;
/*
* Library prototypes.
*/
herr_t H5AC_dest (hdf5_file_t *f);
void *H5AC_find_f (hdf5_file_t *f, const H5AC_class_t *type, haddr_t addr,
const void *udata);
herr_t H5AC_flush (hdf5_file_t *f, const H5AC_class_t *type, haddr_t addr,
hbool_t destroy);
herr_t H5AC_new (hdf5_file_t *f);
herr_t H5AC_rename (hdf5_file_t *f, const H5AC_class_t *type,
haddr_t old, haddr_t new);
herr_t H5AC_set (hdf5_file_t *f, const H5AC_class_t *type, haddr_t addr,
void *thing);
#define H5AC_find(F,TYPE,ADDR,UDATA) \
(((F)->cache[H5AC_HASH(ADDR)].type==(TYPE) && \
(F)->cache[H5AC_HASH(ADDR)].addr==(ADDR)) ? \
(F)->cache[H5AC_HASH(ADDR)].thing : \
H5AC_find_f (F, TYPE, ADDR, UDATA))
#endif /* !_H5ACprivate_H */
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