From 06da3c570f21394003fc392d80f54862f7dec19f Mon Sep 17 00:00:00 2001
From: Alvaro Herrera
Date: Mon, 20 Oct 2008 19:18:18 +0000
Subject: Rework subtransaction commit protocol for hot standby.

This patch eliminates the marking of subtransactions as SUBCOMMITTED in pg_clog
during their commit; instead they remain in-progress until main transaction
commit.  At main transaction commit, the commit protocol is atomic-by-page
instead of one transaction at a time.  To avoid a race condition with some
subtransactions appearing committed before others in the case where they span
more than one pg_clog page, we conserve the logic that marks them subcommitted
before marking the parent committed.

Simon Riggs with minor help from me
---
 src/include/access/clog.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'src/include/access/clog.h')

diff --git a/src/include/access/clog.h b/src/include/access/clog.h
index 8b640a39d6d..ac74c471320 100644
--- a/src/include/access/clog.h
+++ b/src/include/access/clog.h
@@ -6,7 +6,7 @@
  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/access/clog.h,v 1.21 2008/01/01 19:45:56 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/access/clog.h,v 1.22 2008/10/20 19:18:18 alvherre Exp $
  */
 #ifndef CLOG_H
 #define CLOG_H
@@ -32,7 +32,8 @@ typedef int XidStatus;
 #define NUM_CLOG_BUFFERS	8
 
 
-extern void TransactionIdSetStatus(TransactionId xid, XidStatus status, XLogRecPtr lsn);
+extern void TransactionIdSetTreeStatus(TransactionId xid, int nsubxids, 
+					TransactionId *subxids, XidStatus status, XLogRecPtr lsn);
 extern XidStatus TransactionIdGetStatus(TransactionId xid, XLogRecPtr *lsn);
 
 extern Size CLOGShmemSize(void);
-- 
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