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/****************************************************************************
* NCSA HDF *
* Software Development Group *
* National Center for Supercomputing Applications *
* University of Illinois at Urbana-Champaign *
* 605 E. Springfield, Champaign IL 61820 *
* *
* For conditions of distribution and use, see the accompanying *
* hdf/COPYING file. *
* *
****************************************************************************/
/* $Id$ */
/*-----------------------------------------------------------------------------
* File: atom.h
* Purpose: header file for atom API
*---------------------------------------------------------------------------*/
/* avoid re-inclusion */
#ifndef _H5Aprivate_H
#define _H5Aprivate_H
#include <H5Apublic.h> /* Include Public Definitions */
/* Private headers needed by this file */
#include <H5private.h>
/* Atom Features control */
/*
* Define the following macro for fast hash calculations (but limited
* hash sizes)
*/
#define HASH_SIZE_POWER_2
/* Define the following macro for atom caching over all the atoms */
#define ATOMS_ARE_CACHED
#ifdef ATOMS_ARE_CACHED
# define ATOM_CACHE_SIZE 4 /* # of previous atoms cached */
#endif
/* Map an atom to a Group number */
#define ATOM_TO_GROUP(a) ((group_t)((((hid_t)(a))>>((sizeof(hid_t)*8)-GROUP_BITS))&GROUP_MASK))
#ifdef HASH_SIZE_POWER_2
/*
* Map an atom to a hash location (assumes s is a power of 2 and smaller
* than the ATOM_MASK constant).
*/
# define ATOM_TO_LOC(a,s) ((hid_t)(a)&((s)-1))
#else
/*
* Map an atom to a hash location.
*/
# define ATOM_TO_LOC(a,s) (((hid_t)(a)&ATOM_MASK)%(s))
#endif
/* Default sizes of the hash-tables for various atom groups */
#define H5A_ERRSTACK_HASHSIZE 64
#define H5A_FILEID_HASHSIZE 64
#define H5A_TEMPID_HASHSIZE 64
#define H5A_DATATYPEID_HASHSIZE 64
#define H5A_DATASPACEID_HASHSIZE 64
#define H5A_DATASETID_HASHSIZE 64
#define H5A_OID_HASHSIZE 64
#define H5A_GROUPID_HASHSIZE 64
/* Atom information structure used */
typedef struct atom_info_struct_tag {
hid_t id; /* atom ID for this info */
uintn count; /* ref. count for this atom */
VOIDP *obj_ptr; /* pointer associated with the atom */
struct atom_info_struct_tag *next; /* link to next atom (in case of hash-clash) */
} atom_info_t;
/* Atom group structure used */
typedef struct atom_group_struct_tag {
uintn count; /* # of times this group has been initialized */
uintn reserved; /* # of atoms to reserve for constant atoms */
uintn wrapped; /* whether the id count has wrapped around */
intn hash_size; /* size of the hash table to store the atoms in */
uintn atoms; /* current number of atoms held */
uintn nextid; /* atom ID to use for the next atom */
herr_t (*free_func) (void *); /* Pointer to function to call when releasing ref counted object */
atom_info_t **atom_list; /* pointer to an array of ptrs to atoms */
} atom_group_t;
intn H5A_dec_ref(hid_t atm);
hid_t H5A_inc_ref(hid_t atm);
#endif
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