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Separate snapshot management code from tuple visibility code, create a

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snapmgmt.c file for the former.  The header files have also been reorganized
in three parts: the most basic snapshot definitions are now in a new file
snapshot.h, and the also new snapmgmt.h keeps the definitions for snapmgmt.c.
tqual.h has been reduced to the bare minimum.

This patch is just a first step towards managing live snapshots within a
transaction; there is no functionality change.

Per my proposal to pgsql-patches on 20080318191940.GB27458@alvh.no-ip.org and
subsequent discussion.
This commit is contained in:
Alvaro Herrera
2008-03-26 16:20:48 +00:00
parent 2d7705e85e
commit d43b085d57
41 changed files with 345 additions and 258 deletions
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4
src/backend/access/transam/subtrans.c
View File

@@ -22,7 +22,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/access/transam/subtrans.c,v 1.20 2008/01/01 19:45:48 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/subtrans.c,v 1.21 2008/03/26 16:20:46 alvherre Exp $
*
*-------------------------------------------------------------------------
*/
@@ -31,7 +31,7 @@
#include "access/slru.h"
#include "access/subtrans.h"
#include "access/transam.h"
#include "utils/tqual.h"
#include "utils/snapmgmt.h"
/*

4
src/backend/access/transam/transam.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/transam.c,v 1.74 2008/03/11 20:20:35 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/transam.c,v 1.75 2008/03/26 16:20:46 alvherre Exp $
*
* NOTES
* This file contains the high level access-method interface to the
@@ -22,7 +22,7 @@
#include "access/clog.h"
#include "access/subtrans.h"
#include "access/transam.h"
#include "utils/tqual.h"
#include "utils/snapmgmt.h"
/*

3
src/backend/access/transam/xact.c
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@@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.260 2008/03/17 19:44:41 petere Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.261 2008/03/26 16:20:46 alvherre Exp $
*
*-------------------------------------------------------------------------
*/
@@ -45,6 +45,7 @@
#include "utils/inval.h"
#include "utils/memutils.h"
#include "utils/relcache.h"
#include "utils/snapmgmt.h"
#include "utils/xml.h"
#include "pg_trace.h"