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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* 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://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html. If you do not have *
* access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
* Programmer: James Laird <jlaird@ncsa.uiuc.edu>
* Thursday, March 30, 2006
*
* Purpose: This file contains declarations which are visible only within
* the H5SM shared object header messages package. Source files
* outside the H5SM package should include H5SMprivate.h instead.
*/
#ifndef _H5SMpkg_H
#define _H5SMpkg_H
#include "H5SMprivate.h"
#include "H5B2private.h" /* B-trees */
#include "H5HFprivate.h" /* Fractal heaps */
/****************************/
/* Package Macros */
/****************************/
#define H5SM_LIST_MAGIC "SMLI"
#define H5SM_LIST_SIZEOF_MAGIC 4
#define H5SM_TABLE_MAGIC "SMTB"
#define H5SM_TABLE_SIZEOF_MAGIC 4
#define H5SM_SIZEOF_CHECKSUM 4
#define H5SM_SOHM_ENTRY_SIZE(f) (4 /* Hash value */ \
+ 4 /* reference count*/ \
+ sizeof(H5SM_fheap_id_t)) /* size of heap ID on disk */
#define H5SM_TABLE_SIZE(f) ( H5SM_TABLE_SIZEOF_MAGIC \
+ H5SM_SIZEOF_CHECKSUM) /* Checksum */
#define H5SM_INDEX_HEADER_SIZE(f) (1 /* Whether index is a list or B-tree */ \
+ 1 /* Version of index format */ \
+ 2 /* Type of messages stored in the index */ \
+ 4 /* Minimum size of messages to share */ \
+ (3 * 2) /* B-tree cutoff, list cutoff, # of shared messages */ \
+ H5F_SIZEOF_ADDR(f) /* Location of list or B-tree */ \
+ H5F_SIZEOF_ADDR(f)) /* Address of heap */
#define H5SM_LIST_SIZE(f, num_mesg) H5SM_LIST_SIZEOF_MAGIC \
+ (H5SM_SOHM_ENTRY_SIZE(f) * num_mesg) \
+ H5SM_SIZEOF_CHECKSUM /* Checksum */
#define H5SM_B2_NODE_SIZE 512
#define H5SM_B2_SPLIT_PERCENT 100
#define H5SM_B2_MERGE_PERCENT 40
/****************************/
/* Package Typedefs */
/****************************/
/* There are a number of Shared Object Header Message-specific structs here.
*
* The H5SM_master_table_t is pointed to by the file superblock. Since a file
* can have more than one SOHM index, this table collects all the indexes into
* one place. It holds an array of H5SM_index_header_t structs.
*
* An H5SM_index_header_t is actually the for a given index. It holds
* the number of messages in the index, the types of messages in the index,
* etc. It also records whether the index is a list or a b-tree, and has
* the address of the list or b-tree.
*
* If the index is a list, the address in the index header should be given
* to the cache, which can load it into a H5SM_list_t struct. This is mostly
* just a header for the cache information; it contains a pointer back to
* the index header and an unsorted array of messages.
*
* These messages are H5SM_sohm_t structs. They hold the actual SOHM's
* address, hash value, and refcount.
*
* If the index is a b-tree, the H5SM_index_header_t struct holds the address
* of the b-tree instead of the address of a H5SM_list_t. The B-tree's nodes
* are still 'H5SM_sohm_t's.
*
* H5SM_mesg_key_t structs are used to search lists and B-trees for a certain
* message. They correspond to a message that hasn't yet been written to
* disk.
*/
/* Typedef for a SOHM index node */
typedef struct {
uint32_t hash; /* Hash value for OHM */
H5SM_fheap_id_t fheap_id; /* ID of the OHM in the fractal heap */
hsize_t ref_count; /* Number of times this message is used */
} H5SM_sohm_t;
typedef enum {
H5SM_BADTYPE = -1,
H5SM_LIST, /* Index is an unsorted list */
H5SM_BTREE /* Index is a sorted B-tree */
} H5SM_index_type_t;
/* Typedef for searching an index (list or B-tree) */
typedef struct {
H5SM_sohm_t message; /* The message to find/insert.
* If the message doesn't yet have a
* heap ID, the heap ID will be 0. */
const void *encoding; /* The message encoded, or NULL */
size_t encoding_size; /* Size of the encoding, or 0 */
H5HF_t *fheap; /* The heap for this message type, open. */
} H5SM_mesg_key_t;
/* Typedef for a SOHM index header */
typedef struct {
unsigned mesg_types; /* Bit flag vector of message types */
size_t min_mesg_size; /* number of messages being tracked */
size_t list_max; /* >= this many messages, index with a B-tree */
size_t btree_min; /* <= this many messages, index with a list again */
size_t num_messages; /* number of messages being tracked */
H5SM_index_type_t index_type; /* Is the index a list or a B-tree? */
haddr_t index_addr; /* Address of the actual index (list or B-tree) */
haddr_t heap_addr; /* Address of the fheap used to store shared messages */
} H5SM_index_header_t;
/* Typedef for a SOHM list */
typedef struct {
/* Information for H5AC cache functions, _must_ be first field in structure */
H5AC_info_t cache_info;
H5SM_index_header_t *header; /* Pointer to the corresponding index header */
H5SM_sohm_t *messages; /* Actual list, stored as an array */
} H5SM_list_t;
/* Typedef for shared object header message master table */
typedef struct {
/* Information for H5AC cache functions, _must_ be first field in structure */
H5AC_info_t cache_info;
uint8_t num_indexes; /* Number of indexes */
H5SM_index_header_t *indexes; /* Array of num_indexes indexes */
} H5SM_master_table_t;
/*
* Data exchange structure to pass through the fractal heap layer for the
* H5HF_op function when computing a hash value for a message.
*/
typedef struct {
/* downward (internal) */
unsigned type_id; /* Message type */
/* upward */
uint32_t hash; /* Hash value */
} H5SM_fh_ud_gh_t;
/****************************/
/* Package Variables */
/****************************/
/* Declare free lists to manage H5SM structs */
H5FL_ARR_EXTERN(H5SM_index_header_t);
H5FL_EXTERN(H5SM_list_t);
H5FL_ARR_EXTERN(H5SM_sohm_t);
H5_DLLVAR const H5AC_class_t H5AC_SOHM_TABLE[1];
H5_DLLVAR const H5AC_class_t H5AC_SOHM_LIST[1];
H5_DLLVAR const H5B2_class_t H5SM_INDEX[1];
/****************************/
/* Package Prototypes */
/****************************/
/* General routines */
H5_DLL ssize_t H5SM_get_index(const H5SM_master_table_t *table, unsigned type_id);
H5_DLL size_t H5SM_find_in_list(H5SM_list_t *list,
const H5SM_mesg_key_t *key, size_t *empty_pos);
/* Encode and decode routines, used for B-tree and cache encoding/decoding */
H5_DLL herr_t H5SM_message_encode(const H5F_t *f, uint8_t *raw,
const void *native);
H5_DLL herr_t H5SM_message_decode(const H5F_t *f, const uint8_t *raw,
void *native);
/* Callbacks to give to B-tree traversals */
/* H5SM_message_compare is in H5SMbtree2.c, but is also used by list code
* in H5SM.c.
*/
H5_DLL herr_t H5SM_message_compare(const void *rec1,
const void *rec2);
/* H5B2_modify_t callbacks to adjust record's refcount. */
H5_DLL herr_t H5SM_incr_ref(void *record, void *op_data, hbool_t *changed);
H5_DLL herr_t H5SM_decr_ref(void *record, void *op_data, hbool_t *changed);
/* H5B2_remove_t callback to add messages to a list index */
H5_DLL herr_t H5SM_btree_convert_to_list_op(const void * record, void *op_data);
/* Fractal heap 'op' callback to compute hash value for message "in place" */
H5_DLL herr_t H5SM_get_hash_fh_cb(const void *obj, size_t obj_len, void *_udata);
/* Testing functions */
#ifdef H5SM_TESTING
H5_DLL herr_t H5SM_get_mesg_count_test(H5F_t *f, hid_t dxpl_id, unsigned type_id,
size_t *mesg_count);
#endif /* H5SM_TESTING */
#endif /* _H5SMpkg_H */
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