about summary refs log tree commit diff
path: root/db2/db/db_dispatch.c
diff options
context:
space:
mode:
Diffstat (limited to 'db2/db/db_dispatch.c')
-rw-r--r--db2/db/db_dispatch.c316
1 files changed, 0 insertions, 316 deletions
diff --git a/db2/db/db_dispatch.c b/db2/db/db_dispatch.c
deleted file mode 100644
index 616d08c3ff..0000000000
--- a/db2/db/db_dispatch.c
+++ /dev/null
@@ -1,316 +0,0 @@
-/*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1996, 1997, 1998
- *	Sleepycat Software.  All rights reserved.
- */
-/*
- * Copyright (c) 1995, 1996
- *	The President and Fellows of Harvard University.  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.
- */
-
-#include "config.h"
-
-#ifndef lint
-static const char sccsid[] = "@(#)db_dispatch.c	10.20 (Sleepycat) 10/10/98";
-#endif /* not lint */
-
-#ifndef NO_SYSTEM_INCLUDES
-#include <sys/types.h>
-
-#include <errno.h>
-#include <shqueue.h>
-#include <stddef.h>
-#include <stdlib.h>
-#include <string.h>
-#endif
-
-#include "db_int.h"
-#include "db_page.h"
-#include "db_dispatch.h"
-#include "db_am.h"
-#include "common_ext.h"
-#include "log_auto.h"
-#include "txn.h"
-#include "txn_auto.h"
-
-/*
- * Data structures to manage the DB dispatch table.  The dispatch table
- * is a dynamically allocated array of pointers to dispatch functions.
- * The dispatch_size is the number of entries possible in the current
- * dispatch table and the dispatch_valid is the number of valid entries
- * in the dispatch table.
- */
-static int (**dispatch_table) __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
-static u_int32_t dispatch_size = 0;
-
-/*
- * __db_dispatch --
- *
- * This is the transaction dispatch function used by the db access methods.
- * It is designed to handle the record format used by all the access
- * methods (the one automatically generated by the db_{h,log,read}.sh
- * scripts in the tools directory).  An application using a different
- * recovery paradigm will supply a different dispatch function to txn_open.
- *
- * PUBLIC: int __db_dispatch __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
- */
-int
-__db_dispatch(logp, db, lsnp, redo, info)
-	DB_LOG *logp;		/* The log file. */
-	DBT *db;		/* The log record upon which to dispatch. */
-	DB_LSN *lsnp;		/* The lsn of the record being dispatched. */
-	int redo;		/* Redo this op (or undo it). */
-	void *info;
-{
-	u_int32_t rectype, txnid;
-
-	memcpy(&rectype, db->data, sizeof(rectype));
-	memcpy(&txnid, (u_int8_t *)db->data + sizeof(rectype), sizeof(txnid));
-
-	switch (redo) {
-	case TXN_REDO:
-	case TXN_UNDO:
-		return ((dispatch_table[rectype])(logp, db, lsnp, redo, info));
-	case TXN_OPENFILES:
-		if (rectype < DB_txn_BEGIN )
-			return ((dispatch_table[rectype])(logp,
-			    db, lsnp, redo, info));
-		break;
-	case TXN_BACKWARD_ROLL:
-		/*
-		 * Running full recovery in the backward pass.  If we've
-		 * seen this txnid before and added to it our commit list,
-		 * then we do nothing during this pass.  If we've never
-		 * seen it, then we call the appropriate recovery routine
-		 * in "abort mode".
-		 */
-		if (rectype == DB_log_register || rectype == DB_txn_ckp ||
-		    __db_txnlist_find(info, txnid) == DB_NOTFOUND)
-			return ((dispatch_table[rectype])(logp,
-			    db, lsnp, TXN_UNDO, info));
-		break;
-	case TXN_FORWARD_ROLL:
-		/*
-		 * In the forward pass, if we haven't seen the transaction,
-		 * do nothing, else recovery it.
-		 */
-		if (rectype == DB_log_register || rectype == DB_txn_ckp ||
-		    __db_txnlist_find(info, txnid) != DB_NOTFOUND)
-			return ((dispatch_table[rectype])(logp,
-			    db, lsnp, TXN_REDO, info));
-		break;
-	default:
-		abort();
-	}
-	return (0);
-}
-
-/*
- * __db_add_recovery --
- *
- * PUBLIC: int __db_add_recovery __P((DB_ENV *,
- * PUBLIC:    int (*)(DB_LOG *, DBT *, DB_LSN *, int, void *), u_int32_t));
- */
-int
-__db_add_recovery(dbenv, func, ndx)
-	DB_ENV *dbenv;
-	int (*func) __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
-	u_int32_t ndx;
-{
-	u_int32_t i;
-	int ret;
-
-	COMPQUIET(dbenv, NULL);		/* !!!: not currently used. */
-
-	/* Check if we have to grow the table. */
-	if (ndx >= dispatch_size) {
-		if ((ret = __os_realloc(&dispatch_table,
-		    (DB_user_BEGIN + dispatch_size) *
-		    sizeof(dispatch_table[0]))) != 0)
-			return (ret);
-		for (i = dispatch_size,
-		    dispatch_size += DB_user_BEGIN; i < dispatch_size; ++i)
-			dispatch_table[i] = NULL;
-	}
-
-	dispatch_table[ndx] = func;
-	return (0);
-}
-
-/*
- * __db_txnlist_init --
- *	Initialize transaction linked list.
- *
- * PUBLIC: int __db_txnlist_init __P((void *));
- */
-int
-__db_txnlist_init(retp)
-	void *retp;
-{
-	DB_TXNHEAD *headp;
-	int ret;
-
-	if ((ret = __os_malloc(sizeof(DB_TXNHEAD), NULL, &headp)) != 0)
-		return (ret);
-
-	LIST_INIT(&headp->head);
-	headp->maxid = 0;
-	headp->generation = 1;
-
-	*(void **)retp = headp;
-	return (0);
-}
-
-/*
- * __db_txnlist_add --
- *	Add an element to our transaction linked list.
- *
- * PUBLIC: int __db_txnlist_add __P((void *, u_int32_t));
- */
-int
-__db_txnlist_add(listp, txnid)
-	void *listp;
-	u_int32_t txnid;
-{
-	DB_TXNHEAD *hp;
-	DB_TXNLIST *elp;
-	int ret;
-
-	if ((ret = __os_malloc(sizeof(DB_TXNLIST), NULL, &elp)) != 0)
-		return (ret);
-
-	elp->txnid = txnid;
-	hp = (DB_TXNHEAD *)listp;
-	LIST_INSERT_HEAD(&hp->head, elp, links);
-	if (txnid > hp->maxid)
-		hp->maxid = txnid;
-	elp->generation = hp->generation;
-
-	return (0);
-}
-
-/*
- * __db_txnlist_find --
- *	Checks to see if a txnid with the current generation is in the
- *	txnid list.
- *
- * PUBLIC: int __db_txnlist_find __P((void *, u_int32_t));
- */
-int
-__db_txnlist_find(listp, txnid)
-	void *listp;
-	u_int32_t txnid;
-{
-	DB_TXNHEAD *hp;
-	DB_TXNLIST *p;
-
-	if ((hp = (DB_TXNHEAD *)listp) == NULL)
-		return (DB_NOTFOUND);
-
-	for (p = hp->head.lh_first; p != NULL; p = p->links.le_next)
-		if (p->txnid == txnid && hp->generation == p->generation)
-			return (0);
-
-	return (DB_NOTFOUND);
-}
-
-/*
- * __db_txnlist_end --
- *	Discard transaction linked list.
- *
- * PUBLIC: void __db_txnlist_end __P((void *));
- */
-void
-__db_txnlist_end(listp)
-	void *listp;
-{
-	DB_TXNHEAD *hp;
-	DB_TXNLIST *p;
-
-	hp = (DB_TXNHEAD *)listp;
-	while ((p = LIST_FIRST(&hp->head)) != LIST_END(&hp->head)) {
-		LIST_REMOVE(p, links);
-		__os_free(p, 0);
-	}
-	__os_free(listp, sizeof(DB_TXNHEAD));
-}
-
-/*
- * __db_txnlist_gen --
- *	Change the current generation number.
- *
- * PUBLIC: void __db_txnlist_gen __P((void *, int));
- */
-void
-__db_txnlist_gen(listp, incr)
-	void *listp;
-	int incr;
-{
-	DB_TXNHEAD *hp;
-
-	/*
-	 * During recovery generation numbers keep track of how many "restart"
-	 * checkpoints we've seen.  Restart checkpoints occur whenever we take
-	 * a checkpoint and there are no outstanding transactions.  When that
-	 * happens, we can reset transaction IDs back to 1.  It always happens
-	 * at recovery and it prevents us from exhausting the transaction IDs
-	 * name space.
-	 */
-	hp = (DB_TXNHEAD *)listp;
-	hp->generation += incr;
-}
-
-#ifdef DEBUG
-/*
- * __db_txnlist_print --
- *	Print out the transaction list.
- *
- * PUBLIC: void __db_txnlist_print __P((void *));
- */
-void
-__db_txnlist_print(listp)
-	void *listp;
-{
-	DB_TXNHEAD *hp;
-	DB_TXNLIST *p;
-
-	hp = (DB_TXNHEAD *)listp;
-	printf("Maxid: %lu Generation: %lu\n", (u_long)hp->maxid,
-	    (u_long)hp->generation);
-	for (p = hp->head.lh_first; p != NULL; p = p->links.le_next)
-		printf("TXNID: %lu(%lu)\n", (u_long)p->txnid,
-		(u_long)p->generation);
-}
-#endif
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-12-16 20:57:35 +0000