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/transam.h | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

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

diff --git a/src/include/access/transam.h b/src/include/access/transam.h
index 232c59cad3c..6b37723cb9b 100644
--- a/src/include/access/transam.h
+++ b/src/include/access/transam.h
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/access/transam.h,v 1.65 2008/03/11 20:20:35 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/access/transam.h,v 1.66 2008/10/20 19:18:18 alvherre Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -139,13 +139,10 @@ extern VariableCache ShmemVariableCache;
 extern bool TransactionIdDidCommit(TransactionId transactionId);
 extern bool TransactionIdDidAbort(TransactionId transactionId);
 extern bool TransactionIdIsKnownCompleted(TransactionId transactionId);
-extern void TransactionIdCommit(TransactionId transactionId);
-extern void TransactionIdAsyncCommit(TransactionId transactionId, XLogRecPtr lsn);
 extern void TransactionIdAbort(TransactionId transactionId);
-extern void TransactionIdSubCommit(TransactionId transactionId);
-extern void TransactionIdCommitTree(int nxids, TransactionId *xids);
-extern void TransactionIdAsyncCommitTree(int nxids, TransactionId *xids, XLogRecPtr lsn);
-extern void TransactionIdAbortTree(int nxids, TransactionId *xids);
+extern void TransactionIdCommitTree(TransactionId xid, int nxids, TransactionId *xids);
+extern void TransactionIdAsyncCommitTree(TransactionId xid, int nxids, TransactionId *xids, XLogRecPtr lsn);
+extern void TransactionIdAbortTree(TransactionId xid, int nxids, TransactionId *xids);
 extern bool TransactionIdPrecedes(TransactionId id1, TransactionId id2);
 extern bool TransactionIdPrecedesOrEquals(TransactionId id1, TransactionId id2);
 extern bool TransactionIdFollows(TransactionId id1, TransactionId id2);
-- 
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