merge DB 1.85 changes
This commit is contained in:
cgd
parent
90031d7892
commit
17140cef26
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@ -1,4 +1,4 @@
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.\" $NetBSD: btree.3,v 1.5 1995/02/27 13:23:18 cgd Exp $
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.\" $NetBSD: btree.3,v 1.6 1996/05/03 21:26:48 cgd Exp $
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.\"
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.\" Copyright (c) 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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@ -31,9 +31,9 @@
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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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.\" @(#)btree.3 8.3 (Berkeley) 2/21/94
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.\" @(#)btree.3 8.4 (Berkeley) 8/18/94
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.\"
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.TH BTREE 3 "February 21, 1994"
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.TH BTREE 3 "August 18, 1994"
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.\".UC 7
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.SH NAME
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btree \- btree database access method
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@ -209,6 +209,13 @@ O lg base N where base is the average fill factor.
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Often, inserting ordered data into btrees results in a low fill factor.
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This implementation has been modified to make ordered insertion the best
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case, resulting in a much better than normal page fill factor.
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.SH ERRORS
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The
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.I btree
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access method routines may fail and set
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.I errno
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for any of the errors specified for the library routine
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.IR dbopen (3).
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.SH "SEE ALSO"
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.IR dbopen (3),
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.IR hash (3),
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@ -1,4 +1,4 @@
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.\" $NetBSD: hash.3,v 1.5 1995/02/27 13:23:31 cgd Exp $
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.\" $NetBSD: hash.3,v 1.6 1996/05/03 21:26:50 cgd Exp $
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.\"
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.\" Copyright (c) 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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@ -31,9 +31,9 @@
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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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.\" @(#)hash.3 8.5 (Berkeley) 2/21/94
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.\" @(#)hash.3 8.6 (Berkeley) 8/18/94
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.\"
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.TH HASH 3 "February 21, 1994"
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.TH HASH 3 "August 18, 1994"
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.UC 7
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.SH NAME
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hash \- hash database access method
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@ -139,6 +139,13 @@ and
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.IR ndbm (3)
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are provided, however these interfaces are not compatible with
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previous file formats.
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.SH ERRORS
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The
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.I hash
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access method routines may fail and set
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.I errno
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for any of the errors specified for the library routine
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.IR dbopen (3).
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.SH "SEE ALSO"
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.IR btree (3),
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.IR dbopen (3),
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@ -1,4 +1,4 @@
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.\" $NetBSD: recno.3,v 1.5 1995/06/13 00:53:40 jtc Exp $
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.\" $NetBSD: recno.3,v 1.6 1996/05/03 21:26:51 cgd Exp $
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.\"
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.\" Copyright (c) 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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@ -31,9 +31,9 @@
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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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.\" @(#)recno.3 8.3 (Berkeley) 2/21/94
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.\" @(#)recno.3 8.5 (Berkeley) 8/18/94
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.\"
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.TH RECNO 3 "February 21, 1994"
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.TH RECNO 3 "August 18, 1994"
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.UC 7
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.SH NAME
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recno \- record number database access method
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@ -99,6 +99,9 @@ The structure element
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specifies the length of the record, and the structure element
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.I bval
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is used as the pad character.
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Any records, inserted into the database, that are less than
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.I reclen
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bytes long are automatically padded.
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.TP
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R_NOKEY
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In the interface specified by
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@ -178,6 +181,11 @@ The
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.I size
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field of the key should be the size of that type.
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.PP
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Because there can be no meta-data associated with the underlying
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recno access method files, any changes made to the default values
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(e.g. fixed record length or byte separator value) must be explicitly
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specified each time the file is opened.
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.PP
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In the interface specified by
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.IR dbopen ,
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using the
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@ -185,6 +193,18 @@ using the
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interface to create a new record will cause the creation of multiple,
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empty records if the record number is more than one greater than the
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largest record currently in the database.
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.SH ERRORS
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The
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.I recno
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access method routines may fail and set
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.I errno
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for any of the errors specified for the library routine
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.IR dbopen (3)
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or the following:
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.TP
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[EINVAL]
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An attempt was made to add a record to a fixed-length database that
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was too large to fit.
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.SH "SEE ALSO"
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.IR btree (3),
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.IR dbopen (3),
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@ -1,7 +1,7 @@
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/* $NetBSD: mpool.c,v 1.5 1995/02/27 13:24:05 cgd Exp $ */
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/* $NetBSD: mpool.c,v 1.6 1996/05/03 21:29:48 cgd Exp $ */
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/*-
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* Copyright (c) 1990, 1993
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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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* Redistribution and use in source and binary forms, with or without
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@ -35,13 +35,14 @@
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)mpool.c 8.2 (Berkeley) 2/21/94";
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static char sccsid[] = "@(#)mpool.c 8.5 (Berkeley) 7/26/94";
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#else
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static char rcsid[] = "$NetBSD: mpool.c,v 1.5 1995/02/27 13:24:05 cgd Exp $";
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static char rcsid[] = "$NetBSD: mpool.c,v 1.6 1996/05/03 21:29:48 cgd Exp $";
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#include <sys/queue.h>
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#include <sys/stat.h>
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#include <errno.h>
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@ -51,31 +52,21 @@ static char rcsid[] = "$NetBSD: mpool.c,v 1.5 1995/02/27 13:24:05 cgd Exp $";
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#include <unistd.h>
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#include <db.h>
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#define __MPOOLINTERFACE_PRIVATE
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#include "mpool.h"
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#include <mpool.h>
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static BKT *mpool_bkt __P((MPOOL *));
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static BKT *mpool_look __P((MPOOL *, pgno_t));
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static int mpool_write __P((MPOOL *, BKT *));
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#ifdef DEBUG
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static void __mpoolerr __P((const char *fmt, ...));
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#endif
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/*
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* MPOOL_OPEN -- initialize a memory pool.
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*
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* Parameters:
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* key: Shared buffer key.
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* fd: File descriptor.
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* pagesize: File page size.
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* maxcache: Max number of cached pages.
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*
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* Returns:
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* MPOOL pointer, NULL on error.
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* mpool_open --
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* Initialize a memory pool.
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*/
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MPOOL *
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mpool_open(key, fd, pagesize, maxcache)
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DBT *key;
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void *key;
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int fd;
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pgno_t pagesize, maxcache;
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{
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@ -83,49 +74,35 @@ mpool_open(key, fd, pagesize, maxcache)
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MPOOL *mp;
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int entry;
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/*
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* Get information about the file.
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*
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* XXX
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* We don't currently handle pipes, although we should.
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*/
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if (fstat(fd, &sb))
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return (NULL);
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/* XXX
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* We should only set st_size to 0 for pipes -- 4.4BSD has the fix so
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* that stat(2) returns true for ISSOCK on pipes. Until then, this is
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* fairly close.
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*/
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if (!S_ISREG(sb.st_mode)) {
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errno = ESPIPE;
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return (NULL);
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}
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if ((mp = (MPOOL *)malloc(sizeof(MPOOL))) == NULL)
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/* Allocate and initialize the MPOOL cookie. */
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if ((mp = (MPOOL *)calloc(1, sizeof(MPOOL))) == NULL)
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return (NULL);
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mp->free.cnext = mp->free.cprev = (BKT *)&mp->free;
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mp->lru.cnext = mp->lru.cprev = (BKT *)&mp->lru;
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CIRCLEQ_INIT(&mp->lqh);
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for (entry = 0; entry < HASHSIZE; ++entry)
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mp->hashtable[entry].hnext = mp->hashtable[entry].hprev =
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mp->hashtable[entry].cnext = mp->hashtable[entry].cprev =
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(BKT *)&mp->hashtable[entry];
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mp->curcache = 0;
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CIRCLEQ_INIT(&mp->hqh[entry]);
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mp->maxcache = maxcache;
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mp->pagesize = pagesize;
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mp->npages = sb.st_size / pagesize;
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mp->pagesize = pagesize;
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mp->fd = fd;
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mp->pgcookie = NULL;
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mp->pgin = mp->pgout = NULL;
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#ifdef STATISTICS
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mp->cachehit = mp->cachemiss = mp->pagealloc = mp->pageflush =
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mp->pageget = mp->pagenew = mp->pageput = mp->pageread =
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mp->pagewrite = 0;
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#endif
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return (mp);
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}
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/*
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* MPOOL_FILTER -- initialize input/output filters.
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*
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* Parameters:
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* pgin: Page in conversion routine.
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* pgout: Page out conversion routine.
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* pgcookie: Cookie for page in/out routines.
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* mpool_filter --
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* Initialize input/output filters.
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*/
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void
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mpool_filter(mp, pgin, pgout, pgcookie)
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@ -140,124 +117,128 @@ mpool_filter(mp, pgin, pgout, pgcookie)
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}
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/*
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* MPOOL_NEW -- get a new page
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*
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* Parameters:
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* mp: mpool cookie
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* pgnoadddr: place to store new page number
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* Returns:
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* RET_ERROR, RET_SUCCESS
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* mpool_new --
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* Get a new page of memory.
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*/
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void *
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mpool_new(mp, pgnoaddr)
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MPOOL *mp;
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pgno_t *pgnoaddr;
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{
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BKT *b;
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BKTHDR *hp;
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struct _hqh *head;
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BKT *bp;
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if (mp->npages == MAX_PAGE_NUMBER) {
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(void)fprintf(stderr, "mpool_new: page allocation overflow.\n");
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abort();
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}
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#ifdef STATISTICS
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++mp->pagenew;
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#endif
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/*
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* Get a BKT from the cache. Assign a new page number, attach it to
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* the hash and lru chains and return.
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* Get a BKT from the cache. Assign a new page number, attach
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* it to the head of the hash chain, the tail of the lru chain,
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* and return.
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*/
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if ((b = mpool_bkt(mp)) == NULL)
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if ((bp = mpool_bkt(mp)) == NULL)
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return (NULL);
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*pgnoaddr = b->pgno = mp->npages++;
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b->flags = MPOOL_PINNED;
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inshash(b, b->pgno);
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inschain(b, &mp->lru);
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return (b->page);
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*pgnoaddr = bp->pgno = mp->npages++;
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bp->flags = MPOOL_PINNED;
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head = &mp->hqh[HASHKEY(bp->pgno)];
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CIRCLEQ_INSERT_HEAD(head, bp, hq);
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CIRCLEQ_INSERT_TAIL(&mp->lqh, bp, q);
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return (bp->page);
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}
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/*
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* MPOOL_GET -- get a page from the pool
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*
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* Parameters:
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* mp: mpool cookie
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* pgno: page number
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* flags: not used
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*
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* Returns:
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* RET_ERROR, RET_SUCCESS
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* mpool_get
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* Get a page.
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*/
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void *
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mpool_get(mp, pgno, flags)
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MPOOL *mp;
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pgno_t pgno;
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u_int flags; /* XXX not used? */
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u_int flags; /* XXX not used? */
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{
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BKT *b;
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BKTHDR *hp;
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struct _hqh *head;
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BKT *bp;
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off_t off;
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int nr;
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/*
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* If asking for a specific page that is already in the cache, find
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* it and return it.
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*/
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if (b = mpool_look(mp, pgno)) {
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#ifdef STATISTICS
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++mp->pageget;
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#endif
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#ifdef DEBUG
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if (b->flags & MPOOL_PINNED)
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__mpoolerr("mpool_get: page %d already pinned",
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b->pgno);
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#endif
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rmchain(b);
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inschain(b, &mp->lru);
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b->flags |= MPOOL_PINNED;
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return (b->page);
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}
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/* Not allowed to retrieve a non-existent page. */
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/* Check for attempt to retrieve a non-existent page. */
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if (pgno >= mp->npages) {
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errno = EINVAL;
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return (NULL);
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}
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/* Get a page from the cache. */
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if ((b = mpool_bkt(mp)) == NULL)
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return (NULL);
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b->pgno = pgno;
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b->flags = MPOOL_PINNED;
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#ifdef STATISTICS
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++mp->pageget;
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#endif
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|
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/* Check for a page that is cached. */
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if ((bp = mpool_look(mp, pgno)) != NULL) {
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#ifdef DEBUG
|
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if (bp->flags & MPOOL_PINNED) {
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(void)fprintf(stderr,
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"mpool_get: page %d already pinned\n", bp->pgno);
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abort();
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}
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#endif
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/*
|
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* Move the page to the head of the hash chain and the tail
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* of the lru chain.
|
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*/
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head = &mp->hqh[HASHKEY(bp->pgno)];
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CIRCLEQ_REMOVE(head, bp, hq);
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CIRCLEQ_INSERT_HEAD(head, bp, hq);
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CIRCLEQ_REMOVE(&mp->lqh, bp, q);
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CIRCLEQ_INSERT_TAIL(&mp->lqh, bp, q);
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/* Return a pinned page. */
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bp->flags |= MPOOL_PINNED;
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return (bp->page);
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}
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|
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/* Get a page from the cache. */
|
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if ((bp = mpool_bkt(mp)) == NULL)
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return (NULL);
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|
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/* Read in the contents. */
|
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#ifdef STATISTICS
|
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++mp->pageread;
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#endif
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/* Read in the contents. */
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off = mp->pagesize * pgno;
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if (lseek(mp->fd, off, SEEK_SET) != off)
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return (NULL);
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if ((nr = read(mp->fd, b->page, mp->pagesize)) != mp->pagesize) {
|
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if ((nr = read(mp->fd, bp->page, mp->pagesize)) != mp->pagesize) {
|
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if (nr >= 0)
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errno = EFTYPE;
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return (NULL);
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}
|
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if (mp->pgin)
|
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(mp->pgin)(mp->pgcookie, b->pgno, b->page);
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||||
|
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inshash(b, b->pgno);
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inschain(b, &mp->lru);
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#ifdef STATISTICS
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++mp->pageget;
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#endif
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return (b->page);
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/* Set the page number, pin the page. */
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bp->pgno = pgno;
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bp->flags = MPOOL_PINNED;
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/*
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* Add the page to the head of the hash chain and the tail
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* of the lru chain.
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*/
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head = &mp->hqh[HASHKEY(bp->pgno)];
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CIRCLEQ_INSERT_HEAD(head, bp, hq);
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CIRCLEQ_INSERT_TAIL(&mp->lqh, bp, q);
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/* Run through the user's filter. */
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if (mp->pgin != NULL)
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(mp->pgin)(mp->pgcookie, bp->pgno, bp->page);
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|
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return (bp->page);
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}
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/*
|
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* MPOOL_PUT -- return a page to the pool
|
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*
|
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* Parameters:
|
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* mp: mpool cookie
|
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* page: page pointer
|
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* pgno: page number
|
||||
*
|
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* Returns:
|
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* RET_ERROR, RET_SUCCESS
|
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* mpool_put
|
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* Return a page.
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||||
*/
|
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int
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mpool_put(mp, page, flags)
|
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|
|
@ -265,193 +246,172 @@ mpool_put(mp, page, flags)
|
|||
void *page;
|
||||
u_int flags;
|
||||
{
|
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BKT *baddr;
|
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#ifdef DEBUG
|
||||
BKT *b;
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||||
#endif
|
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BKT *bp;
|
||||
|
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#ifdef STATISTICS
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++mp->pageput;
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#endif
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baddr = (BKT *)((char *)page - sizeof(BKT));
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bp = (BKT *)((char *)page - sizeof(BKT));
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#ifdef DEBUG
|
||||
if (!(baddr->flags & MPOOL_PINNED))
|
||||
__mpoolerr("mpool_put: page %d not pinned", b->pgno);
|
||||
for (b = mp->lru.cnext; b != (BKT *)&mp->lru; b = b->cnext) {
|
||||
if (b == (BKT *)&mp->lru)
|
||||
__mpoolerr("mpool_put: %0x: bad address", baddr);
|
||||
if (b == baddr)
|
||||
break;
|
||||
if (!(bp->flags & MPOOL_PINNED)) {
|
||||
(void)fprintf(stderr,
|
||||
"mpool_put: page %d not pinned\n", bp->pgno);
|
||||
abort();
|
||||
}
|
||||
#endif
|
||||
baddr->flags &= ~MPOOL_PINNED;
|
||||
baddr->flags |= flags & MPOOL_DIRTY;
|
||||
bp->flags &= ~MPOOL_PINNED;
|
||||
bp->flags |= flags & MPOOL_DIRTY;
|
||||
return (RET_SUCCESS);
|
||||
}
|
||||
|
||||
/*
|
||||
* MPOOL_CLOSE -- close the buffer pool
|
||||
*
|
||||
* Parameters:
|
||||
* mp: mpool cookie
|
||||
*
|
||||
* Returns:
|
||||
* RET_ERROR, RET_SUCCESS
|
||||
* mpool_close
|
||||
* Close the buffer pool.
|
||||
*/
|
||||
int
|
||||
mpool_close(mp)
|
||||
MPOOL *mp;
|
||||
{
|
||||
BKT *b, *next;
|
||||
BKT *bp;
|
||||
|
||||
/* Free up any space allocated to the lru pages. */
|
||||
for (b = mp->lru.cprev; b != (BKT *)&mp->lru; b = next) {
|
||||
next = b->cprev;
|
||||
free(b);
|
||||
while ((bp = mp->lqh.cqh_first) != (void *)&mp->lqh) {
|
||||
CIRCLEQ_REMOVE(&mp->lqh, mp->lqh.cqh_first, q);
|
||||
free(bp);
|
||||
}
|
||||
|
||||
/* Free the MPOOL cookie. */
|
||||
free(mp);
|
||||
return (RET_SUCCESS);
|
||||
}
|
||||
|
||||
/*
|
||||
* MPOOL_SYNC -- sync the file to disk.
|
||||
*
|
||||
* Parameters:
|
||||
* mp: mpool cookie
|
||||
*
|
||||
* Returns:
|
||||
* RET_ERROR, RET_SUCCESS
|
||||
* mpool_sync
|
||||
* Sync the pool to disk.
|
||||
*/
|
||||
int
|
||||
mpool_sync(mp)
|
||||
MPOOL *mp;
|
||||
{
|
||||
BKT *b;
|
||||
BKT *bp;
|
||||
|
||||
for (b = mp->lru.cprev; b != (BKT *)&mp->lru; b = b->cprev)
|
||||
if (b->flags & MPOOL_DIRTY && mpool_write(mp, b) == RET_ERROR)
|
||||
/* Walk the lru chain, flushing any dirty pages to disk. */
|
||||
for (bp = mp->lqh.cqh_first;
|
||||
bp != (void *)&mp->lqh; bp = bp->q.cqe_next)
|
||||
if (bp->flags & MPOOL_DIRTY &&
|
||||
mpool_write(mp, bp) == RET_ERROR)
|
||||
return (RET_ERROR);
|
||||
|
||||
/* Sync the file descriptor. */
|
||||
return (fsync(mp->fd) ? RET_ERROR : RET_SUCCESS);
|
||||
}
|
||||
|
||||
/*
|
||||
* MPOOL_BKT -- get/create a BKT from the cache
|
||||
*
|
||||
* Parameters:
|
||||
* mp: mpool cookie
|
||||
*
|
||||
* Returns:
|
||||
* NULL on failure and a pointer to the BKT on success
|
||||
* mpool_bkt
|
||||
* Get a page from the cache (or create one).
|
||||
*/
|
||||
static BKT *
|
||||
mpool_bkt(mp)
|
||||
MPOOL *mp;
|
||||
{
|
||||
BKT *b;
|
||||
struct _hqh *head;
|
||||
BKT *bp;
|
||||
|
||||
/* If under the max cached, always create a new page. */
|
||||
if (mp->curcache < mp->maxcache)
|
||||
goto new;
|
||||
|
||||
/*
|
||||
* If the cache is maxxed out, search the lru list for a buffer we
|
||||
* can flush. If we find one, write it if necessary and take it off
|
||||
* any lists. If we don't find anything we grow the cache anyway.
|
||||
* If the cache is max'd out, walk the lru list for a buffer we
|
||||
* can flush. If we find one, write it (if necessary) and take it
|
||||
* off any lists. If we don't find anything we grow the cache anyway.
|
||||
* The cache never shrinks.
|
||||
*/
|
||||
for (b = mp->lru.cprev; b != (BKT *)&mp->lru; b = b->cprev)
|
||||
if (!(b->flags & MPOOL_PINNED)) {
|
||||
if (b->flags & MPOOL_DIRTY &&
|
||||
mpool_write(mp, b) == RET_ERROR)
|
||||
for (bp = mp->lqh.cqh_first;
|
||||
bp != (void *)&mp->lqh; bp = bp->q.cqe_next)
|
||||
if (!(bp->flags & MPOOL_PINNED)) {
|
||||
/* Flush if dirty. */
|
||||
if (bp->flags & MPOOL_DIRTY &&
|
||||
mpool_write(mp, bp) == RET_ERROR)
|
||||
return (NULL);
|
||||
rmhash(b);
|
||||
rmchain(b);
|
||||
#ifdef STATISTICS
|
||||
++mp->pageflush;
|
||||
#endif
|
||||
/* Remove from the hash and lru queues. */
|
||||
head = &mp->hqh[HASHKEY(bp->pgno)];
|
||||
CIRCLEQ_REMOVE(head, bp, hq);
|
||||
CIRCLEQ_REMOVE(&mp->lqh, bp, q);
|
||||
#ifdef DEBUG
|
||||
{
|
||||
void *spage;
|
||||
spage = b->page;
|
||||
memset(b, 0xff, sizeof(BKT) + mp->pagesize);
|
||||
b->page = spage;
|
||||
{ void *spage;
|
||||
spage = bp->page;
|
||||
memset(bp, 0xff, sizeof(BKT) + mp->pagesize);
|
||||
bp->page = spage;
|
||||
}
|
||||
#endif
|
||||
return (b);
|
||||
return (bp);
|
||||
}
|
||||
|
||||
new: if ((b = (BKT *)malloc(sizeof(BKT) + mp->pagesize)) == NULL)
|
||||
new: if ((bp = (BKT *)malloc(sizeof(BKT) + mp->pagesize)) == NULL)
|
||||
return (NULL);
|
||||
#ifdef STATISTICS
|
||||
++mp->pagealloc;
|
||||
#endif
|
||||
#ifdef DEBUG
|
||||
memset(b, 0xff, sizeof(BKT) + mp->pagesize);
|
||||
#if defined(DEBUG) || defined(PURIFY)
|
||||
memset(bp, 0xff, sizeof(BKT) + mp->pagesize);
|
||||
#endif
|
||||
b->page = (char *)b + sizeof(BKT);
|
||||
bp->page = (char *)bp + sizeof(BKT);
|
||||
++mp->curcache;
|
||||
return (b);
|
||||
return (bp);
|
||||
}
|
||||
|
||||
/*
|
||||
* MPOOL_WRITE -- sync a page to disk
|
||||
*
|
||||
* Parameters:
|
||||
* mp: mpool cookie
|
||||
*
|
||||
* Returns:
|
||||
* RET_ERROR, RET_SUCCESS
|
||||
* mpool_write
|
||||
* Write a page to disk.
|
||||
*/
|
||||
static int
|
||||
mpool_write(mp, b)
|
||||
mpool_write(mp, bp)
|
||||
MPOOL *mp;
|
||||
BKT *b;
|
||||
BKT *bp;
|
||||
{
|
||||
off_t off;
|
||||
|
||||
if (mp->pgout)
|
||||
(mp->pgout)(mp->pgcookie, b->pgno, b->page);
|
||||
|
||||
#ifdef STATISTICS
|
||||
++mp->pagewrite;
|
||||
#endif
|
||||
off = mp->pagesize * b->pgno;
|
||||
|
||||
/* Run through the user's filter. */
|
||||
if (mp->pgout)
|
||||
(mp->pgout)(mp->pgcookie, bp->pgno, bp->page);
|
||||
|
||||
off = mp->pagesize * bp->pgno;
|
||||
if (lseek(mp->fd, off, SEEK_SET) != off)
|
||||
return (RET_ERROR);
|
||||
if (write(mp->fd, b->page, mp->pagesize) != mp->pagesize)
|
||||
if (write(mp->fd, bp->page, mp->pagesize) != mp->pagesize)
|
||||
return (RET_ERROR);
|
||||
b->flags &= ~MPOOL_DIRTY;
|
||||
|
||||
bp->flags &= ~MPOOL_DIRTY;
|
||||
return (RET_SUCCESS);
|
||||
}
|
||||
|
||||
/*
|
||||
* MPOOL_LOOK -- lookup a page
|
||||
*
|
||||
* Parameters:
|
||||
* mp: mpool cookie
|
||||
* pgno: page number
|
||||
*
|
||||
* Returns:
|
||||
* NULL on failure and a pointer to the BKT on success
|
||||
* mpool_look
|
||||
* Lookup a page in the cache.
|
||||
*/
|
||||
static BKT *
|
||||
mpool_look(mp, pgno)
|
||||
MPOOL *mp;
|
||||
pgno_t pgno;
|
||||
{
|
||||
register BKT *b;
|
||||
register BKTHDR *tb;
|
||||
struct _hqh *head;
|
||||
BKT *bp;
|
||||
|
||||
/* XXX
|
||||
* If find the buffer, put it first on the hash chain so can
|
||||
* find it again quickly.
|
||||
*/
|
||||
tb = &mp->hashtable[HASHKEY(pgno)];
|
||||
for (b = tb->hnext; b != (BKT *)tb; b = b->hnext)
|
||||
if (b->pgno == pgno) {
|
||||
head = &mp->hqh[HASHKEY(pgno)];
|
||||
for (bp = head->cqh_first; bp != (void *)head; bp = bp->hq.cqe_next)
|
||||
if (bp->pgno == pgno) {
|
||||
#ifdef STATISTICS
|
||||
++mp->cachehit;
|
||||
#endif
|
||||
return (b);
|
||||
return (bp);
|
||||
}
|
||||
#ifdef STATISTICS
|
||||
++mp->cachemiss;
|
||||
|
|
@ -461,16 +421,14 @@ mpool_look(mp, pgno)
|
|||
|
||||
#ifdef STATISTICS
|
||||
/*
|
||||
* MPOOL_STAT -- cache statistics
|
||||
*
|
||||
* Parameters:
|
||||
* mp: mpool cookie
|
||||
* mpool_stat
|
||||
* Print out cache statistics.
|
||||
*/
|
||||
void
|
||||
mpool_stat(mp)
|
||||
MPOOL *mp;
|
||||
{
|
||||
BKT *b;
|
||||
BKT *bp;
|
||||
int cnt;
|
||||
char *sep;
|
||||
|
||||
|
|
@ -492,11 +450,12 @@ mpool_stat(mp)
|
|||
|
||||
sep = "";
|
||||
cnt = 0;
|
||||
for (b = mp->lru.cnext; b != (BKT *)&mp->lru; b = b->cnext) {
|
||||
(void)fprintf(stderr, "%s%d", sep, b->pgno);
|
||||
if (b->flags & MPOOL_DIRTY)
|
||||
for (bp = mp->lqh.cqh_first;
|
||||
bp != (void *)&mp->lqh; bp = bp->q.cqe_next) {
|
||||
(void)fprintf(stderr, "%s%d", sep, bp->pgno);
|
||||
if (bp->flags & MPOOL_DIRTY)
|
||||
(void)fprintf(stderr, "d");
|
||||
if (b->flags & MPOOL_PINNED)
|
||||
if (bp->flags & MPOOL_PINNED)
|
||||
(void)fprintf(stderr, "P");
|
||||
if (++cnt == 10) {
|
||||
sep = "\n";
|
||||
|
|
@ -508,33 +467,3 @@ mpool_stat(mp)
|
|||
(void)fprintf(stderr, "\n");
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef DEBUG
|
||||
#if __STDC__
|
||||
#include <stdarg.h>
|
||||
#else
|
||||
#include <varargs.h>
|
||||
#endif
|
||||
|
||||
static void
|
||||
#if __STDC__
|
||||
__mpoolerr(const char *fmt, ...)
|
||||
#else
|
||||
__mpoolerr(fmt, va_alist)
|
||||
char *fmt;
|
||||
va_dcl
|
||||
#endif
|
||||
{
|
||||
va_list ap;
|
||||
#if __STDC__
|
||||
va_start(ap, fmt);
|
||||
#else
|
||||
va_start(ap);
|
||||
#endif
|
||||
(void)vfprintf(stderr, fmt, ap);
|
||||
va_end(ap);
|
||||
(void)fprintf(stderr, "\n");
|
||||
abort();
|
||||
/* NOTREACHED */
|
||||
}
|
||||
#endif
|
||||
|
|
|
|||
Loading…
Reference in New Issue