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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. *
* *
****************************************************************************/
/*-----------------------------------------------------------------------------
* File: H5Iprivate.h
* Purpose: header file for ID API
*---------------------------------------------------------------------------*/
/* avoid re-inclusion */
#ifndef _H5Iprivate_H
#define _H5Iprivate_H
#include "H5Ipublic.h" /*include Public Definitions */
/* Private headers needed by this file */
#include "H5private.h"
/* Default sizes of the hash-tables for various atom groups */
#define H5I_ERRSTACK_HASHSIZE 64
#define H5I_FILEID_HASHSIZE 64
#define H5I_TEMPID_HASHSIZE 64
#define H5I_DATATYPEID_HASHSIZE 64
#define H5I_DATASPACEID_HASHSIZE 64
#define H5I_DATASETID_HASHSIZE 64
#define H5I_OID_HASHSIZE 64
#define H5I_GROUPID_HASHSIZE 64
#define H5I_ATTRID_HASHSIZE 64
#define H5I_TEMPBUFID_HASHSIZE 64
#define H5I_REFID_HASHSIZE 64
#define H5I_VFL_HASHSIZE 64
#define H5I_GENPROPCLS_HASHSIZE 64
#define H5I_GENPROPOBJ_HASHSIZE 128
/*
* 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 IDS_ARE_CACHED
#ifdef IDS_ARE_CACHED
# define ID_CACHE_SIZE 4 /*# of previous atoms cached */
#endif
/*
* Number of bits to use for Group ID in each atom. Increase if H5I_NGROUPS
* becomes too large (an assertion would fail in H5I_init_interface). This is
* the only number that must be changed since all other bit field sizes and
* masks are calculated from GROUP_BITS.
*/
#define GROUP_BITS 5
#define GROUP_MASK ((1<<GROUP_BITS)-1)
/*
* Number of bits to use for the Atom index in each atom (assumes 8-bit
* bytes). We don't use the sign bit.
*/
#define ID_BITS ((sizeof(hid_t)*8)-(GROUP_BITS+1))
#define ID_MASK ((1<<ID_BITS)-1)
/* Map an atom to a Group number */
#define H5I_GROUP(a) ((H5I_type_t)(((hid_t)(a)>>ID_BITS) & GROUP_MASK))
#ifdef HASH_SIZE_POWER_2
/*
* Map an ID to a hash location (assumes s is a power of 2 and smaller
* than the ID_MASK constant).
*/
# define H5I_LOC(a,s) ((hid_t)((size_t)(a)&((s)-1)))
# define POWER_OF_TWO(n) ((((n) - 1) & (n)) == 0 && (n) > 0)
#else
/*
* Map an ID to a hash location.
*/
# define H5I_LOC(a,s) (((hid_t)(a)&ID_MASK)%(s))
#endif
/* Combine a Group number and an atom index into an atom */
#define H5I_MAKE(g,i) ((((hid_t)(g)&GROUP_MASK)<<ID_BITS)| \
((hid_t)(i)&ID_MASK))
/*
* Function for freeing objects. This function will be called with an object
* ID group number (object type) and a pointer to the object. The function
* should free the object and return non-negative to indicate that the object
* can be removed from the ID group. If the function returns negative
* (failure) then the object will remain in the ID group.
*/
typedef herr_t (*H5I_free_t)(void*);
/* Type of the function to compare objects & keys */
typedef int (*H5I_search_func_t)(void *obj, hid_t id, const void *key);
/* Atom information structure used */
typedef struct H5I_id_info_t {
hid_t id; /* ID for this info */
unsigned count; /* ref. count for this atom */
void *obj_ptr; /* pointer associated with the atom */
struct H5I_id_info_t *next; /* link to next atom (in case of hash-clash)*/
} H5I_id_info_t;
/* ID group structure used */
typedef struct {
unsigned count; /*# of times this group has been initialized*/
unsigned reserved; /*# of IDs to reserve for constant IDs */
unsigned wrapped; /*whether the id count has wrapped around */
size_t hash_size; /*sizeof the hash table to store the IDs in */
unsigned ids; /*current number of IDs held */
unsigned nextid; /*ID to use for the next atom */
H5I_free_t free_func; /*release object method */
H5I_id_info_t **id_list; /*pointer to an array of ptrs to IDs */
} H5I_id_group_t;
/* Private Functions in H5I.c */
H5_DLL int H5I_init_group(H5I_type_t grp, size_t hash_size, unsigned reserved,
H5I_free_t func);
H5_DLL int H5I_nmembers(H5I_type_t grp);
H5_DLL herr_t H5I_clear_group(H5I_type_t grp, hbool_t force);
H5_DLL herr_t H5I_destroy_group(H5I_type_t grp);
H5_DLL hid_t H5I_register(H5I_type_t grp, void *object);
H5_DLL void *H5I_object(hid_t id);
H5_DLL void *H5I_object_verify(hid_t id, H5I_type_t id_type);
H5_DLL H5I_type_t H5I_get_type(hid_t id);
H5_DLL void *H5I_remove(hid_t id);
H5_DLL void *H5I_search(H5I_type_t grp, H5I_search_func_t func,
const void *key);
H5_DLL int H5I_inc_ref(hid_t id);
H5_DLL int H5I_dec_ref(hid_t id);
#endif
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