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This patch wraps all accesses to t_xmin, t_cmin, t_xmax, and t_cmax in

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HeapTupleHeaderData in setter and getter macros called
HeapTupleHeaderGetXmin, HeapTupleHeaderSetXmin etc.

It also introduces a "virtual" field xvac by defining
HeapTupleHeaderGetXvac and HeapTupleHeaderSetXvac.  Xvac is used by
VACUUM, in fact it is stored in t_cmin.

Manfred Koizar
This commit is contained in:
Bruce Momjian
2002-06-15 19:54:24 +00:00
parent 7882179994
commit 3c35face41
14 changed files with 312 additions and 246 deletions
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111
src/include/access/htup.h
View File

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: htup.h,v 1.52 2002/05/27 19:53:33 tgl Exp $
* $Id: htup.h,v 1.53 2002/06/15 19:54:24 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -16,6 +16,7 @@
#include "storage/bufpage.h"
#include "storage/relfilenode.h"
#include "access/transam.h"
/*
@@ -83,6 +84,87 @@ typedef struct HeapTupleHeaderData
typedef HeapTupleHeaderData *HeapTupleHeader;
/*
* information stored in t_infomask:
*/
#define HEAP_HASNULL 0x0001 /* has null attribute(s) */
#define HEAP_HASVARLENA 0x0002 /* has variable length
* attribute(s) */
#define HEAP_HASEXTERNAL 0x0004 /* has external stored
* attribute(s) */
#define HEAP_HASCOMPRESSED 0x0008 /* has compressed stored
* attribute(s) */
#define HEAP_HASEXTENDED 0x000C /* the two above combined */
#define HEAP_XMAX_UNLOGGED 0x0080 /* to lock tuple for update */
/* without logging */
#define HEAP_XMIN_COMMITTED 0x0100 /* t_xmin committed */
#define HEAP_XMIN_INVALID 0x0200 /* t_xmin invalid/aborted */
#define HEAP_XMAX_COMMITTED 0x0400 /* t_xmax committed */
#define HEAP_XMAX_INVALID 0x0800 /* t_xmax invalid/aborted */
#define HEAP_MARKED_FOR_UPDATE 0x1000 /* marked for UPDATE */
#define HEAP_UPDATED 0x2000 /* this is UPDATEd version of row */
#define HEAP_MOVED_OFF 0x4000 /* moved to another place by
* vacuum */
#define HEAP_MOVED_IN 0x8000 /* moved from another place by
* vacuum */
#define HEAP_XACT_MASK 0xFFF0 /* visibility-related bits */
/* HeapTupleHeader accessor macros */
#define HeapTupleHeaderGetXmin(tup) \
((tup)->t_xmin)
#define HeapTupleHeaderGetXmax(tup) \
((tup)->t_xmax)
/* no AssertMacro, because this is read as a system-defined attribute also */
#define HeapTupleHeaderGetCmin(tup) \
( \
(tup)->t_cmin \
)
#define HeapTupleHeaderGetCmax(tup) \
((tup)->t_cmax)
#define HeapTupleHeaderGetXvac(tup) \
( \
AssertMacro((tup)->t_infomask & (HEAP_MOVED_IN | HEAP_MOVED_OFF)), \
(TransactionId) (tup)->t_cmin \
)
#define HeapTupleHeaderSetXmin(tup, xid) \
(TransactionIdStore((xid), &(tup)->t_xmin))
#define HeapTupleHeaderSetXminInvalid(tup) \
(StoreInvalidTransactionId(&(tup)->t_xmin))
#define HeapTupleHeaderSetXmax(tup, xid) \
(TransactionIdStore((xid), &(tup)->t_xmax))
#define HeapTupleHeaderSetXmaxInvalid(tup) \
(StoreInvalidTransactionId(&(tup)->t_xmax))
#define HeapTupleHeaderSetCmin(tup, cid) \
( \
AssertMacro(!((tup)->t_infomask & (HEAP_MOVED_IN | HEAP_MOVED_OFF))), \
(tup)->t_cmin = (cid) \
)
#define HeapTupleHeaderSetCmax(tup, cid) \
((tup)->t_cmax = (cid))
#define HeapTupleHeaderSetXvac(tup, xid) \
( \
AssertMacro((tup)->t_infomask & (HEAP_MOVED_IN | HEAP_MOVED_OFF)), \
TransactionIdStore((xid), (TransactionId *) &((tup)->t_cmin)) \
)
/*
* XLOG allows to store some information in high 4 bits of log
* record xl_info field
@@ -250,33 +332,6 @@ typedef HeapTupleData *HeapTuple;
*/
#define HeapTupleIsValid(tuple) PointerIsValid(tuple)
/*
* information stored in t_infomask:
*/
#define HEAP_HASNULL 0x0001 /* has null attribute(s) */
#define HEAP_HASVARLENA 0x0002 /* has variable length
* attribute(s) */
#define HEAP_HASEXTERNAL 0x0004 /* has external stored
* attribute(s) */
#define HEAP_HASCOMPRESSED 0x0008 /* has compressed stored
* attribute(s) */
#define HEAP_HASEXTENDED 0x000C /* the two above combined */
#define HEAP_XMAX_UNLOGGED 0x0080 /* to lock tuple for update
* without logging */
#define HEAP_XMIN_COMMITTED 0x0100 /* t_xmin committed */
#define HEAP_XMIN_INVALID 0x0200 /* t_xmin invalid/aborted */
#define HEAP_XMAX_COMMITTED 0x0400 /* t_xmax committed */
#define HEAP_XMAX_INVALID 0x0800 /* t_xmax invalid/aborted */
#define HEAP_MARKED_FOR_UPDATE 0x1000 /* marked for UPDATE */
#define HEAP_UPDATED 0x2000 /* this is UPDATEd version of row */
#define HEAP_MOVED_OFF 0x4000 /* moved to another place by
* vacuum */
#define HEAP_MOVED_IN 0x8000 /* moved from another place by
* vacuum */
#define HEAP_XACT_MASK 0xFFF0 /* visibility-related bits */
#define HeapTupleNoNulls(tuple) \
(!(((HeapTuple) (tuple))->t_data->t_infomask & HEAP_HASNULL))