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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 __ATOM_H
#define __ATOM_H
#include "H5Aproto.h" /* Include Public Definitions */
/* 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
#if defined HDF5_ATOM_MASTER | defined HDF5_ATOM_TESTER
#ifdef ATOMS_ARE_CACHED
/* # of previous atoms cached */
#define ATOM_CACHE_SIZE 4
#endif /* ATOMS_ARE_CACHED */
/* Map an atom to a Group number */
#define ATOM_TO_GROUP(a) ((group_t)((((hatom_t)(a))>>((sizeof(hatom_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) ((hatom_t)(a)&((s)-1))
#else /* HASH_SIZE_POWER_2 */
/* Map an atom to a hash location */
#define ATOM_TO_LOC(a,s) (((hatom_t)(a)&ATOM_MASK)%(s))
#endif /* HASH_SIZE_POWER_2 */
/* Atom information structure used */
typedef struct atom_info_struct_tag {
hatom_t id; /* atom ID for this info */
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 */
atom_info_t **atom_list;/* pointer to an array of ptrs to atoms */
}atom_group_t;
/* Define this in only one place */
#ifdef HDF5_ATOM_MASTER
/* Array of pointers to atomic groups */
static atom_group_t *atom_group_list[MAXGROUP]={NULL};
/* Pointer to the atom node free list */
static atom_info_t *atom_free_list=NULL;
#ifdef ATOMS_ARE_CACHED
/* Array of pointers to atomic groups */
static hatom_t atom_id_cache[ATOM_CACHE_SIZE]={-1,-1,-1,-1};
static VOIDP atom_obj_cache[ATOM_CACHE_SIZE]={NULL};
#endif /* ATOMS_ARE_CACHED */
#endif /* HDF5_ATOM_MASTER */
/* Useful routines for generally private use */
#endif /* HDF5_ATOM_MASTER | HDF5_ATOM_TESTER */
#endif /* __ATOM_H */
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