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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>
/*
* Feature: Define H5AC_DEBUG on the compiler command line if you want to
* debug H5AC_protect() and H5AC_unprotect() by insuring that
* nothing accesses protected objects. NDEBUG must not be defined
* in order for this to have any effect.
*/
#ifdef NDEBUG
# undef H5AC_DEBUG
#endif
/*
* 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 enum H5AC_subid_t {
H5AC_BT_ID = 0, /*B-tree nodes */
H5AC_SNODE_ID = 1, /*symbol table nodes */
H5AC_LHEAP_ID = 2, /*local heap */
H5AC_GHEAP_ID = 3, /*global heap */
H5AC_OHDR_ID = 4, /*object header */
H5AC_NTYPES = 5 /*THIS MUST BE LAST! */
} H5AC_subid_t;
typedef struct H5AC_class_t {
H5AC_subid_t id;
void *(*load)(H5F_t*, haddr_t addr, const void *udata1,
void *udata2);
herr_t (*flush)(H5F_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 /* The library "likes" this number... */
#define H5AC_HASH_DIVISOR 8 /* Attempt to spread out the hashing */
/* This should be the same size as the alignment of */
/* of the smallest file format object written to the file. */
#define H5AC_HASH(F,ADDR) H5F_addr_hash((ADDR/H5AC_HASH_DIVISOR),(F)->shared->cache->nslots)
typedef struct H5AC_prot_t {
const H5AC_class_t *type; /*type of protected thing */
haddr_t addr; /*address of protected thing */
void *thing; /*(possible) protected thing */
} H5AC_prot_t;
typedef struct H5AC_slot_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 */
#ifdef H5AC_DEBUG
intn nprots; /*number of things protected */
intn aprots; /*nelmts of `prot' array */
H5AC_prot_t *prot; /*array of protected things */
#endif
} H5AC_slot_t;
typedef struct H5AC_t {
uintn nslots; /*number of cache slots */
H5AC_slot_t *slot; /*the cache slots */
intn nprots; /*number of protected objects */
struct {
uintn nhits; /*number of cache hits */
uintn nmisses; /*number of cache misses */
uintn ninits; /*number of cache inits */
uintn nflushes; /*number of flushes to disk */
} diagnostics[H5AC_NTYPES]; /*diagnostics for each type of object*/
} H5AC_t;
/*
* Library prototypes.
*/
__DLL__ herr_t H5AC_dest(H5F_t *f);
__DLL__ void *H5AC_find_f(H5F_t *f, const H5AC_class_t *type, haddr_t addr,
const void *udata1, void *udata2);
__DLL__ void *H5AC_protect(H5F_t *f, const H5AC_class_t *type, haddr_t addr,
const void *udata1, void *udata2);
__DLL__ herr_t H5AC_unprotect(H5F_t *f, const H5AC_class_t *type, haddr_t addr,
void *thing);
__DLL__ herr_t H5AC_flush(H5F_t *f, const H5AC_class_t *type, haddr_t addr,
hbool_t destroy);
__DLL__ herr_t H5AC_create(H5F_t *f, intn size_hint);
__DLL__ herr_t H5AC_rename(H5F_t *f, const H5AC_class_t *type,
haddr_t old_addr, haddr_t new_addr);
__DLL__ herr_t H5AC_set(H5F_t *f, const H5AC_class_t *type, haddr_t addr,
void *thing);
__DLL__ herr_t H5AC_debug(H5F_t *f);
#define H5AC_find(F,TYPE,ADDR,UDATA1,UDATA2) \
(((F)->shared->cache->slot[H5AC_HASH(F,ADDR)].type==(TYPE) && \
(F)->shared->cache->slot[H5AC_HASH(F,ADDR)].addr==ADDR) ? \
((F)->shared->cache->diagnostics[(TYPE)->id].nhits++, \
(F)->shared->cache->slot[H5AC_HASH(F,ADDR)].thing) : \
H5AC_find_f(F, TYPE, ADDR, UDATA1, UDATA2))
#endif /* !_H5ACprivate_H */
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