Import BSDDB 4.7.25 (as of svn r89086)
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Zachary Ware
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dbinc/hash.h
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167
dbinc/hash.h
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/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1996,2008 Oracle. All rights reserved.
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*/
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/*
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* Copyright (c) 1990, 1993, 1994
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* Margo Seltzer. All rights reserved.
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*/
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/*
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* Copyright (c) 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Margo Seltzer.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: hash.h 63573 2008-05-23 21:43:21Z trent.nelson $
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*/
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#ifndef _DB_HASH_H_
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#define _DB_HASH_H_
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/* Hash internal structure. */
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typedef struct hash_t {
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db_pgno_t meta_pgno; /* Page number of the meta data page. */
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u_int32_t h_ffactor; /* Fill factor. */
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u_int32_t h_nelem; /* Number of elements. */
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/* Hash and compare functions. */
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u_int32_t (*h_hash) __P((DB *, const void *, u_int32_t));
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int (*h_compare) __P((DB *, const DBT *, const DBT *));
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} HASH;
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/* Cursor structure definitions. */
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typedef struct cursor_t {
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/* struct __dbc_internal */
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__DBC_INTERNAL
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/* Hash private part */
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/* Per-thread information */
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DB_LOCK hlock; /* Metadata page lock. */
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HMETA *hdr; /* Pointer to meta-data page. */
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PAGE *split_buf; /* Temporary buffer for splits. */
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/* Hash cursor information */
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db_pgno_t bucket; /* Bucket we are traversing. */
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db_pgno_t lbucket; /* Bucket for which we are locked. */
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db_indx_t dup_off; /* Offset within a duplicate set. */
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db_indx_t dup_len; /* Length of current duplicate. */
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db_indx_t dup_tlen; /* Total length of duplicate entry. */
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u_int32_t seek_size; /* Number of bytes we need for add. */
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db_pgno_t seek_found_page;/* Page on which we can insert. */
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db_indx_t seek_found_indx;/* Insert position for item. */
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u_int32_t order; /* Relative order among deleted curs. */
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#define H_CONTINUE 0x0001 /* Join--search strictly fwd for data */
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#define H_DELETED 0x0002 /* Cursor item is deleted. */
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#define H_DUPONLY 0x0004 /* Dups only; do not change key. */
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#define H_EXPAND 0x0008 /* Table expanded. */
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#define H_ISDUP 0x0010 /* Cursor is within duplicate set. */
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#define H_NEXT_NODUP 0x0020 /* Get next non-dup entry. */
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#define H_NOMORE 0x0040 /* No more entries in bucket. */
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#define H_OK 0x0080 /* Request succeeded. */
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u_int32_t flags;
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} HASH_CURSOR;
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/* Test string. */
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#define CHARKEY "%$sniglet^&"
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/* Overflow management */
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/*
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* The spares table indicates the page number at which each doubling begins.
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* From this page number we subtract the number of buckets already allocated
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* so that we can do a simple addition to calculate the page number here.
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*/
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#define BS_TO_PAGE(bucket, spares) \
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((bucket) + (spares)[__db_log2((bucket) + 1)])
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#define BUCKET_TO_PAGE(I, B) (BS_TO_PAGE((B), (I)->hdr->spares))
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/* Constraints about much data goes on a page. */
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#define MINFILL 4
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#define ISBIG(I, N) (((N) > ((I)->hdr->dbmeta.pagesize / MINFILL)) ? 1 : 0)
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/* Shorthands for accessing structure */
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#define NDX_INVALID 0xFFFF
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#define BUCKET_INVALID 0xFFFFFFFF
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/* On page duplicates are stored as a string of size-data-size triples. */
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#define DUP_SIZE(len) ((len) + 2 * sizeof(db_indx_t))
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/* Log messages types (these are subtypes within a record type) */
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#define PAIR_KEYMASK 0x1
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#define PAIR_DATAMASK 0x2
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#define PAIR_DUPMASK 0x4
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#define PAIR_MASK 0xf
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#define PAIR_ISKEYBIG(N) (N & PAIR_KEYMASK)
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#define PAIR_ISDATABIG(N) (N & PAIR_DATAMASK)
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#define PAIR_ISDATADUP(N) (N & PAIR_DUPMASK)
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#define OPCODE_OF(N) (N & ~PAIR_MASK)
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#define PUTPAIR 0x20
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#define DELPAIR 0x30
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#define PUTOVFL 0x40
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#define DELOVFL 0x50
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#define HASH_UNUSED1 0x60
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#define HASH_UNUSED2 0x70
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#define SPLITOLD 0x80
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#define SPLITNEW 0x90
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#define SORTPAGE 0x100
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/* Flags to control behavior of __ham_del_pair */
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#define HAM_DEL_NO_CURSOR 0x01 /* Don't do any cursor adjustment */
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#define HAM_DEL_NO_RECLAIM 0x02 /* Don't reclaim empty pages */
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typedef enum {
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DB_HAM_CURADJ_DEL = 1,
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DB_HAM_CURADJ_ADD = 2,
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DB_HAM_CURADJ_ADDMOD = 3,
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DB_HAM_CURADJ_DELMOD = 4
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} db_ham_curadj;
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typedef enum {
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DB_HAM_CHGPG = 1,
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DB_HAM_DELFIRSTPG = 2,
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DB_HAM_DELMIDPG = 3,
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DB_HAM_DELLASTPG = 4,
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DB_HAM_DUP = 5,
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DB_HAM_SPLIT = 6
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} db_ham_mode;
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#if defined(__cplusplus)
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}
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#endif
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#include "dbinc_auto/hash_auto.h"
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#include "dbinc_auto/hash_ext.h"
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#include "dbinc/db_am.h"
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#endif /* !_DB_HASH_H_ */
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