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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* Copyright by the Board of Trustees of the University of Illinois. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the files COPYING and Copyright.html. COPYING can be found at the root *
* of the source code distribution tree; Copyright.html can be found at the *
* root level of an installed copy of the electronic HDF5 document set and *
* is linked from the top-level documents page. It can also be found at *
* http://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have *
* access to either file, you may request a copy from help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* Programmer: Quincey Koziol <koziol@ncsa.uiuc.edu>
* Wednesday, July 9, 2003
*
* Purpose: This file contains declarations which are visible
* only within the H5HG package. Source files outside the
* H5HG package should include H5HGprivate.h instead.
*/
#ifndef H5HG_PACKAGE
#error "Do not include this file outside the H5HG package!"
#endif
#ifndef _H5HGpkg_H
#define _H5HGpkg_H
/* Get package's private header */
#include "H5HGprivate.h"
/* Other private headers needed by this file */
#include "H5AC2private.h" /* Metadata cache */
#define H5F_PACKAGE
#include "H5Fpkg.h"
/*****************************/
/* Package Private Variables */
/*****************************/
/* The cache subclass */
H5_DLLVAR const H5AC2_class_t H5AC2_GHEAP[1];
/* Declare a free list to manage the H5HG_t struct */
H5FL_EXTERN(H5HG_heap_t);
/* Declare a free list to manage sequences of H5HG_obj_t's */
H5FL_SEQ_EXTERN(H5HG_obj_t);
/* Declare a PQ free list to manage heap chunks */
H5FL_BLK_EXTERN(heap_chunk);
/**************************/
/* Package Private Macros */
/**************************/
/*
* Pad all global heap messages to a multiple of eight bytes so we can load
* the entire collection into memory and operate on it there. Eight should
* be sufficient for machines that have alignment constraints because our
* largest data type is eight bytes.
*/
#define H5HG_ALIGNMENT 8
#define H5HG_ALIGN(X) (H5HG_ALIGNMENT*(((X)+H5HG_ALIGNMENT-1)/ \
H5HG_ALIGNMENT))
#define H5HG_ISALIGNED(X) ((X)==H5HG_ALIGN(X))
/*
* The overhead associated with each object in the heap, always a multiple of
* the alignment so that the stuff that follows the header is aligned.
*/
#define H5HG_SIZEOF_OBJHDR(f) \
H5HG_ALIGN(2 + /*object id number */ \
2 + /*reference count */ \
4 + /*reserved */ \
H5F_SIZEOF_SIZE(f)) /*object data size */
/*
* Global heap collection version.
*/
#define H5HG_VERSION 1
/*
* All global heap collections are at least this big. This allows us to read
* most collections with a single read() since we don't have to read a few
* bytes of header to figure out the size. If the heap is larger than this
* then a second read gets the rest after we've decoded the header.
*/
#define H5HG_MINSIZE 4096
/*
* Limit global heap collections to the some reasonable size. This is
* fairly arbitrary, but needs to be small enough that no more than H5HG_MAXIDX
* objects will be allocated from a single heap.
*/
#define H5HG_MAXSIZE 65536
/*
* Maximum length of the CWFS list, the list of remembered collections that
* have free space.
*/
#define H5HG_NCWFS 16
/*
* The maximum number of links allowed to a global heap object.
*/
#define H5HG_MAXLINK 65535
/*
* The maximum number of indices allowed in a global heap object.
*/
#define H5HG_MAXIDX 65535
/*
* The size of the collection header, always a multiple of the alignment so
* that the stuff that follows the header is aligned.
*/
#define H5HG_SIZEOF_HDR(f) \
H5HG_ALIGN(4 + /*magic number */ \
1 + /*version number */ \
3 + /*reserved */ \
H5F_SIZEOF_SIZE(f)) /*collection size */
/*
* The initial guess for the number of messages in a collection. We assume
* that all objects in that collection are zero length, giving the maximum
* possible number of objects in the collection. The collection itself has
* some overhead and each message has some overhead. The `+2' accounts for
* rounding and for the free space object.
*/
#define H5HG_NOBJS(f,z) (int)((((z)-H5HG_SIZEOF_HDR(f))/ \
H5HG_SIZEOF_OBJHDR(f)+2))
/*
* Makes a global heap object pointer undefined, or checks whether one is
* defined.
*/
#define H5HG_undef(HGP) ((HGP)->idx=0)
#define H5HG_defined(HGP) ((HGP)->idx!=0)
#define H5HG_SPEC_READ_SIZE 4096
/****************************/
/* Package Private Typedefs */
/****************************/
typedef struct H5HG_obj_t {
int nrefs; /*reference count */
size_t size; /*total size of object */
uint8_t *begin; /*ptr to object into heap->chunk*/
} H5HG_obj_t;
struct H5HG_heap_t {
H5AC2_info_t cache_info; /* Information for H5AC2 cache functions, _must_ be */
/* first field in structure */
haddr_t addr; /*collection address */
size_t size; /*total size of collection */
uint8_t *chunk; /*the collection, incl. header */
size_t nalloc; /*numb object slots allocated */
size_t nused; /*number of slots used */
/* If this value is >65535 then all indices */
/* have been used at some time and the */
/* correct new index should be searched for */
H5F_file_t *shared; /* shared file */
H5HG_obj_t *obj; /*array of object descriptions */
};
/******************************/
/* Package Private Prototypes */
/******************************/
H5_DLL herr_t H5HG_dest(H5HG_heap_t *heap);
#endif
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