2019-07-27 22:44:32 +08:00
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/*-
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2014-11-19 00:25:21 +08:00
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1996-2004
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* Sleepycat Software. All rights reserved.
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*/
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/*
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* Copyright (c) 1995, 1996
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* The President and Fellows of Harvard University. All rights reserved.
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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: db_dispatch.h,v 11.38 2004/07/26 19:54:08 margo Exp $
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*/
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#ifndef _DB_DISPATCH_H_
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#define _DB_DISPATCH_H_
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/*
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* Declarations and typedefs for the list of transaction IDs used during
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* recovery. This is a generic list used to pass along whatever information
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* we need during recovery.
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*/
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typedef enum {
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TXNLIST_DELETE,
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TXNLIST_LSN,
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TXNLIST_PGNO,
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TXNLIST_TXNID
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} db_txnlist_type;
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#define DB_TXNLIST_MASK(hp, n) (n % hp->nslots)
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struct __db_txnhead {
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u_int32_t maxid; /* Maximum transaction id. */
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DB_LSN maxlsn; /* Maximum commit lsn. */
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DB_LSN ckplsn; /* LSN of last retained checkpoint. */
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DB_LSN trunc_lsn; /* Lsn to which we are going to truncate;
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* make sure we abort anyone after this. */
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u_int32_t generation; /* Current generation number. */
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u_int32_t gen_alloc; /* Number of generations allocated. */
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struct {
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u_int32_t generation;
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u_int32_t txn_min;
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u_int32_t txn_max;
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} *gen_array; /* Array of txnids associated with a gen. */
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u_int nslots;
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LIST_HEAD(__db_headlink, __db_txnlist) head[1];
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};
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struct __db_txnlist {
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db_txnlist_type type;
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LIST_ENTRY(__db_txnlist) links;
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union {
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struct {
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u_int32_t txnid;
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u_int32_t generation;
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u_int32_t status;
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} t;
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struct {
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u_int32_t ntxns;
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u_int32_t maxn;
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DB_LSN *lsn_array;
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} l;
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struct {
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u_int32_t nentries;
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u_int32_t maxentry;
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int32_t locked;
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char *fname;
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int32_t fileid;
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db_pgno_t *pgno_array;
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u_int8_t uid[DB_FILE_ID_LEN];
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} p;
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} u;
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};
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/*
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* Flag value for __db_txnlist_lsnadd. Distinguish whether we are replacing
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* an entry in the transaction list or adding a new one.
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*/
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#define TXNLIST_NEW 0x1
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/*
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* States for limbo list processing.
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*/
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typedef enum {
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LIMBO_NORMAL, /* Normal processing. */
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LIMBO_PREPARE, /* We are preparing a transaction. */
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LIMBO_RECOVER, /* We are in recovery. */
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LIMBO_TIMESTAMP, /* We are recovering to a timestamp. */
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LIMBO_COMPENSATE /* After recover to ts, generate log records. */
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} db_limbo_state;
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#endif /* !_DB_DISPATCH_H_ */
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