From: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: Thu, 7 Jul 2011 21:36:30 +0000 (+0300)
Subject: There's a small window wherein a transaction is committed but not yet
X-Git-Tag: REL9_1_BETA3~3
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=9b47c67ccde6ec91219ad4aba515a48c136f9568;p=postgresql

There's a small window wherein a transaction is committed but not yet
on the finished list, and we shouldn't flag it as a potential conflict
if so. We can also skip adding a doomed transaction to the list of
possible conflicts because we know it won't commit.

Dan Ports and Kevin Grittner.
---

diff --git a/src/backend/storage/lmgr/predicate.c b/src/backend/storage/lmgr/predicate.c
index d93de7de90..3c3a6a9d96 100644
--- a/src/backend/storage/lmgr/predicate.c
+++ b/src/backend/storage/lmgr/predicate.c
@@ -1677,8 +1677,9 @@ RegisterSerializableTransactionInt(Snapshot snapshot)
 			 othersxact != NULL;
 			 othersxact = NextPredXact(othersxact))
 		{
-			if (!SxactIsOnFinishedList(othersxact) &&
-				!SxactIsReadOnly(othersxact))
+			if (!SxactIsCommitted(othersxact)
+				&& !SxactIsDoomed(othersxact)
+				&& !SxactIsReadOnly(othersxact))
 			{
 				SetPossibleUnsafeConflict(sxact, othersxact);
 			}