mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-27 15:30:07 +00:00
200 lines
7.2 KiB
C
200 lines
7.2 KiB
C
/*-
|
|
* See the file LICENSE for redistribution information.
|
|
*
|
|
* Copyright (c) 1996, 1997, 1998
|
|
* Sleepycat Software. All rights reserved.
|
|
*/
|
|
/*
|
|
* Copyright (c) 1990, 1993, 1994
|
|
* Margo Seltzer. All rights reserved.
|
|
*/
|
|
/*
|
|
* Copyright (c) 1990, 1993, 1994
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Margo Seltzer.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)hash.h 10.14 (Sleepycat) 10/4/98
|
|
*/
|
|
|
|
/* Cursor structure definitions. */
|
|
typedef struct cursor_t {
|
|
DBC *dbc;
|
|
|
|
/* Per-thread information */
|
|
DB_LOCK hlock; /* Metadata page lock. */
|
|
HASHHDR *hdr; /* Pointer to meta-data page. */
|
|
PAGE *split_buf; /* Temporary buffer for splits. */
|
|
struct __db_h_stat stats; /* Hash statistics. */
|
|
|
|
/* Hash cursor information */
|
|
db_pgno_t bucket; /* Bucket we are traversing. */
|
|
db_pgno_t lbucket; /* Bucket for which we are locked. */
|
|
DB_LOCK lock; /* Lock held on the current bucket. */
|
|
PAGE *pagep; /* The current page. */
|
|
db_pgno_t pgno; /* Current page number. */
|
|
db_indx_t bndx; /* Index within the current page. */
|
|
PAGE *dpagep; /* Duplicate page pointer. */
|
|
db_pgno_t dpgno; /* Duplicate page number. */
|
|
db_indx_t dndx; /* Index within a duplicate set. */
|
|
db_indx_t dup_off; /* Offset within a duplicate set. */
|
|
db_indx_t dup_len; /* Length of current duplicate. */
|
|
db_indx_t dup_tlen; /* Total length of duplicate entry. */
|
|
u_int32_t seek_size; /* Number of bytes we need for add. */
|
|
db_pgno_t seek_found_page;/* Page on which we can insert. */
|
|
|
|
#define H_DELETED 0x0001 /* Cursor item is deleted. */
|
|
#define H_DUPONLY 0x0002 /* Dups only; do not change key. */
|
|
#define H_EXPAND 0x0004 /* Table expanded. */
|
|
#define H_ISDUP 0x0008 /* Cursor is within duplicate set. */
|
|
#define H_NOMORE 0x0010 /* No more entries in bucket. */
|
|
#define H_OK 0x0020 /* Request succeeded. */
|
|
#define H_DIRTY 0x0040 /* Meta-data page needs to be written */
|
|
#define H_ORIGINAL 0x0080 /* Bucket lock existed on entry. */
|
|
u_int32_t flags;
|
|
} HASH_CURSOR;
|
|
|
|
#define IS_VALID(C) ((C)->bucket != BUCKET_INVALID)
|
|
|
|
#define SAVE_CURSOR(ORIG, COPY) { \
|
|
F_SET((ORIG), H_ORIGINAL); \
|
|
*(COPY) = *(ORIG); \
|
|
}
|
|
|
|
#define RESTORE_CURSOR(D, ORIG, COPY, RET) { \
|
|
if ((RET) == 0) { \
|
|
if ((ORIG)->dbc->txn == NULL && \
|
|
(COPY)->lock != 0 && (ORIG)->lock != (COPY)->lock) \
|
|
(void)lock_put((D)->dbenv->lk_info, (COPY)->lock); \
|
|
} else { \
|
|
if ((ORIG)->dbc->txn == NULL && \
|
|
(ORIG)->lock != 0 && (ORIG)->lock != (COPY)->lock) \
|
|
(void)lock_put((D)->dbenv->lk_info, (ORIG)->lock); \
|
|
*ORIG = *COPY; \
|
|
} \
|
|
}
|
|
|
|
/*
|
|
* More interface macros used to get/release the meta data page.
|
|
*/
|
|
#define GET_META(D, I, R) { \
|
|
if (F_ISSET(D, DB_AM_LOCKING) && \
|
|
!F_ISSET((I)->dbc, DBC_RECOVER)) { \
|
|
(I)->dbc->lock.pgno = BUCKET_INVALID; \
|
|
(R) = lock_get((D)->dbenv->lk_info, (I)->dbc->locker, \
|
|
0, &(I)->dbc->lock_dbt, DB_LOCK_READ, &(I)->hlock); \
|
|
(R) = (R) < 0 ? EAGAIN : (R); \
|
|
} \
|
|
if ((R) == 0 && \
|
|
((R) = __ham_get_page(D, 0, (PAGE **)&((I)->hdr))) != 0 && \
|
|
(I)->hlock != LOCK_INVALID) { \
|
|
(void)lock_put((D)->dbenv->lk_info, (I)->hlock); \
|
|
(I)->hlock = LOCK_INVALID; \
|
|
} \
|
|
}
|
|
|
|
#define RELEASE_META(D, I) { \
|
|
if ((I)->hdr) \
|
|
(void)__ham_put_page(D, (PAGE *)(I)->hdr, \
|
|
F_ISSET(I, H_DIRTY) ? 1 : 0); \
|
|
(I)->hdr = NULL; \
|
|
if (!F_ISSET((I)->dbc, DBC_RECOVER) && \
|
|
(I)->dbc->txn == NULL && (I)->hlock) \
|
|
(void)lock_put((D)->dbenv->lk_info, (I)->hlock); \
|
|
(I)->hlock = LOCK_INVALID; \
|
|
F_CLR(I, H_DIRTY); \
|
|
}
|
|
|
|
#define DIRTY_META(D, I, R) { \
|
|
if (F_ISSET(D, DB_AM_LOCKING) && \
|
|
!F_ISSET((I)->dbc, DBC_RECOVER)) { \
|
|
DB_LOCK _tmp; \
|
|
(I)->dbc->lock.pgno = BUCKET_INVALID; \
|
|
if (((R) = lock_get((D)->dbenv->lk_info, \
|
|
(I)->dbc->locker, 0, &(I)->dbc->lock_dbt, \
|
|
DB_LOCK_WRITE, &_tmp)) == 0) \
|
|
(R) = lock_put((D)->dbenv->lk_info, (I)->hlock);\
|
|
else if ((R) < 0) \
|
|
(R) = EAGAIN; \
|
|
(I)->hlock = _tmp; \
|
|
} \
|
|
F_SET((I), H_DIRTY); \
|
|
}
|
|
|
|
/* Test string. */
|
|
#define CHARKEY "%$sniglet^&"
|
|
|
|
/* Overflow management */
|
|
/*
|
|
* Overflow page numbers are allocated per split point. At each doubling of
|
|
* the table, we can allocate extra pages. We keep track of how many pages
|
|
* we've allocated at each point to calculate bucket to page number mapping.
|
|
*/
|
|
#define BUCKET_TO_PAGE(I, B) \
|
|
((B) + 1 + ((B) ? (I)->hdr->spares[__db_log2((B)+1)-1] : 0))
|
|
|
|
#define PGNO_OF(I, S, O) (BUCKET_TO_PAGE((I), (1 << (S)) - 1) + (O))
|
|
|
|
/* Constraints about number of pages and how much data goes on a page. */
|
|
|
|
#define MAX_PAGES(H) UINT32_T_MAX
|
|
#define MINFILL 4
|
|
#define ISBIG(I, N) (((N) > ((I)->hdr->pagesize / MINFILL)) ? 1 : 0)
|
|
|
|
/* Shorthands for accessing structure */
|
|
#define NDX_INVALID 0xFFFF
|
|
#define BUCKET_INVALID 0xFFFFFFFF
|
|
|
|
/* On page duplicates are stored as a string of size-data-size triples. */
|
|
#define DUP_SIZE(len) ((len) + 2 * sizeof(db_indx_t))
|
|
|
|
/* Log messages types (these are subtypes within a record type) */
|
|
#define PAIR_KEYMASK 0x1
|
|
#define PAIR_DATAMASK 0x2
|
|
#define PAIR_ISKEYBIG(N) (N & PAIR_KEYMASK)
|
|
#define PAIR_ISDATABIG(N) (N & PAIR_DATAMASK)
|
|
#define OPCODE_OF(N) (N & ~(PAIR_KEYMASK | PAIR_DATAMASK))
|
|
|
|
#define PUTPAIR 0x20
|
|
#define DELPAIR 0x30
|
|
#define PUTOVFL 0x40
|
|
#define DELOVFL 0x50
|
|
#define ALLOCPGNO 0x60
|
|
#define DELPGNO 0x70
|
|
#define SPLITOLD 0x80
|
|
#define SPLITNEW 0x90
|
|
|
|
#include "hash_auto.h"
|
|
#include "hash_ext.h"
|
|
#include "db_am.h"
|
|
#include "common_ext.h"
|