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Fix subtransaction behavior for large objects, temp namespace, files,

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password/group files.  Also allow read-only subtransactions of a read-write
parent, but not vice versa.  These are the reasonably noncontroversial
parts of Alvaro's recent mop-up patch, plus further work on large objects
to minimize use of the TopTransactionResourceOwner.
This commit is contained in:
Tom Lane
2004-07-28 14:23:31 +00:00
parent cc813fc2b8
commit 1bf3d61504
17 changed files with 572 additions and 205 deletions
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47
src/backend/catalog/namespace.c
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@@ -13,7 +13,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/catalog/namespace.c,v 1.67 2004/06/18 06:13:19 tgl Exp $
* $PostgreSQL: pgsql/src/backend/catalog/namespace.c,v 1.68 2004/07/28 14:23:27 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -107,12 +107,17 @@ static bool namespaceSearchPathValid = true;
* myTempNamespace is InvalidOid until and unless a TEMP namespace is set up
* in a particular backend session (this happens when a CREATE TEMP TABLE
* command is first executed). Thereafter it's the OID of the temp namespace.
* firstTempTransaction flags whether we've committed creation of the TEMP
* namespace or not.
*
* myTempNamespaceXID shows whether we've created the TEMP namespace in the
* current transaction. The TransactionId propagates up the transaction tree,
* so the main transaction will correctly recognize the flag if all
* intermediate subtransactions commit. When it is InvalidTransactionId,
* we either haven't made the TEMP namespace yet, or have successfully
* committed its creation, depending on whether myTempNamespace is valid.
*/
static Oid myTempNamespace = InvalidOid;
static bool firstTempTransaction = false;
static TransactionId myTempNamespaceXID = InvalidTransactionId;
/*
* "Special" namespace for CREATE SCHEMA. If set, it's the first search
@@ -1688,7 +1693,9 @@ InitTempTableNamespace(void)
*/
myTempNamespace = namespaceId;
firstTempTransaction = true;
/* It should not be done already. */
AssertState(myTempNamespaceXID == InvalidTransactionId);
myTempNamespaceXID = GetCurrentTransactionId();
namespaceSearchPathValid = false; /* need to rebuild list */
}
@@ -1707,7 +1714,7 @@ AtEOXact_Namespace(bool isCommit)
* temp tables at backend shutdown. (We only want to register the
* callback once per session, so this is a good place to do it.)
*/
if (firstTempTransaction)
if (myTempNamespaceXID == GetCurrentTransactionId())
{
if (isCommit)
on_shmem_exit(RemoveTempRelationsCallback, 0);
@@ -1716,7 +1723,7 @@ AtEOXact_Namespace(bool isCommit)
myTempNamespace = InvalidOid;
namespaceSearchPathValid = false; /* need to rebuild list */
}
firstTempTransaction = false;
myTempNamespaceXID = InvalidTransactionId;
}
/*
@@ -1729,6 +1736,32 @@ AtEOXact_Namespace(bool isCommit)
}
}
/*
* AtEOSubXact_Namespace
*
* At subtransaction commit, propagate the temp-namespace-creation
* flag to the parent transaction.
*
* At subtransaction abort, forget the flag if we set it up.
*/
void
AtEOSubXact_Namespace(bool isCommit, TransactionId myXid,
TransactionId parentXid)
{
if (myTempNamespaceXID == myXid)
{
if (isCommit)
myTempNamespaceXID = parentXid;
else
{
myTempNamespaceXID = InvalidTransactionId;
/* TEMP namespace creation failed, so reset state */
myTempNamespace = InvalidOid;
namespaceSearchPathValid = false; /* need to rebuild list */
}
}
}
/*
* Remove all relations in the specified temp namespace.
*