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Invent ResourceOwner mechanism as per my recent proposal, and use it to 

keep track of portal-related resources separately from transaction-related
resources.  This allows cursors to work in a somewhat sane fashion with
nested transactions.  For now, cursor behavior is non-subtransactional,
that is a cursor's state does not roll back if you abort a subtransaction
that fetched from the cursor.  We might want to change that later.
This commit is contained in:
Tom Lane 2004-07-17 03:32:14 +00:00
parent f4c069ca8f
commit fe548629c5
41 changed files with 2086 additions and 1192 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
contrib/userlock/user_locks.c
View File

@ -75,7 +75,7 @@ user_write_unlock_oid(Oid oid)
int
user_unlock_all(void)
{
return LockReleaseAll(USER_LOCKMETHOD, MyProc, ReleaseAll, 0, NULL);
return LockReleaseAll(USER_LOCKMETHOD, MyProc, true);
}
/* end of file */

43
src/backend/access/gist/gistscan.c
View File

@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/gist/gistscan.c,v 1.52 2004/07/01 00:49:27 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/gist/gistscan.c,v 1.53 2004/07/17 03:27:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -17,6 +17,7 @@
#include "access/genam.h"
#include "access/gist.h"
#include "access/gistscan.h"
#include "utils/resowner.h"
/* routines defined and used here */
@ -41,7 +42,7 @@ static void adjustiptr(IndexScanDesc s, ItemPointer iptr,
typedef struct GISTScanListData
{
IndexScanDesc gsl_scan;
TransactionId gsl_creatingXid;
ResourceOwner gsl_owner;
struct GISTScanListData *gsl_next;
} GISTScanListData;
@ -224,7 +225,7 @@ gistregscan(IndexScanDesc s)
l = (GISTScanList) palloc(sizeof(GISTScanListData));
l->gsl_scan = s;
l->gsl_creatingXid = GetCurrentTransactionId();
l->gsl_owner = CurrentResourceOwner;
l->gsl_next = GISTScans;
GISTScans = l;
}
@ -253,52 +254,28 @@ gistdropscan(IndexScanDesc s)
}
/*
* AtEOXact_gist() --- clean up gist subsystem at xact abort or commit.
* ReleaseResources_gist() --- clean up gist subsystem resources.
*
* This is here because it needs to touch this module's static var GISTScans.
*/
void
AtEOXact_gist(void)
{
/*
* Note: these actions should only be necessary during xact abort; but
* they can't hurt during a commit.
*/
/*
* Reset the active-scans list to empty. We do not need to free the
* list elements, because they're all palloc()'d, so they'll go away
* at end of transaction anyway.
*/
GISTScans = NULL;
}
/*
* AtEOSubXact_gist() --- clean up gist subsystem at subxact abort or commit.
*
* This is here because it needs to touch this module's static var GISTScans.
*/
void
AtEOSubXact_gist(TransactionId childXid)
ReleaseResources_gist(void)
{
GISTScanList l;
GISTScanList prev;
GISTScanList next;
/*
* Note: these actions should only be necessary during xact abort; but
* they can't hurt during a commit.
*/
/*
* Forget active scans that were started in this subtransaction.
* Note: this should be a no-op during normal query shutdown.
* However, in an abort situation ExecutorEnd is not called and so
* there may be open index scans to clean up.
*/
prev = NULL;
for (l = GISTScans; l != NULL; l = next)
{
next = l->gsl_next;
if (l->gsl_creatingXid == childXid)
if (l->gsl_owner == CurrentResourceOwner)
{
if (prev == NULL)
GISTScans = next;

43
src/backend/access/hash/hashscan.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/hash/hashscan.c,v 1.34 2004/07/01 00:49:29 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/hash/hashscan.c,v 1.35 2004/07/17 03:27:40 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -16,12 +16,13 @@
#include "postgres.h"
#include "access/hash.h"
#include "utils/resowner.h"
typedef struct HashScanListData
{
IndexScanDesc hashsl_scan;
TransactionId hashsl_creatingXid;
ResourceOwner hashsl_owner;
struct HashScanListData *hashsl_next;
} HashScanListData;
@ -31,52 +32,28 @@ static HashScanList HashScans = NULL;
/*
* AtEOXact_hash() --- clean up hash subsystem at xact abort or commit.
* ReleaseResources_hash() --- clean up hash subsystem resources.
*
* This is here because it needs to touch this module's static var HashScans.
*/
void
AtEOXact_hash(void)
{
/*
* Note: these actions should only be necessary during xact abort; but
* they can't hurt during a commit.
*/
/*
* Reset the active-scans list to empty. We do not need to free the
* list elements, because they're all palloc()'d, so they'll go away
* at end of transaction anyway.
*/
HashScans = NULL;
}
/*
* AtEOSubXact_hash() --- clean up hash subsystem at subxact abort or commit.
*
* This is here because it needs to touch this module's static var HashScans.
*/
void
AtEOSubXact_hash(TransactionId childXid)
ReleaseResources_hash(void)
{
HashScanList l;
HashScanList prev;
HashScanList next;
/*
* Note: these actions should only be necessary during xact abort; but
* they can't hurt during a commit.
*/
/*
* Forget active scans that were started in this subtransaction.
* Note: this should be a no-op during normal query shutdown.
* However, in an abort situation ExecutorEnd is not called and so
* there may be open index scans to clean up.
*/
prev = NULL;
for (l = HashScans; l != NULL; l = next)
{
next = l->hashsl_next;
if (l->hashsl_creatingXid == childXid)
if (l->hashsl_owner == CurrentResourceOwner)
{
if (prev == NULL)
HashScans = next;
@ -101,7 +78,7 @@ _hash_regscan(IndexScanDesc scan)
new_el = (HashScanList) palloc(sizeof(HashScanListData));
new_el->hashsl_scan = scan;
new_el->hashsl_creatingXid = GetCurrentTransactionId();
new_el->hashsl_owner = CurrentResourceOwner;
new_el->hashsl_next = HashScans;
HashScans = new_el;
}

12
src/backend/access/nbtree/nbtree.c
View File

@ -12,7 +12,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtree.c,v 1.118 2004/06/05 19:48:07 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/nbtree/nbtree.c,v 1.119 2004/07/17 03:27:59 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -58,16 +58,6 @@ static void btbuildCallback(Relation index,
void *state);
/*
* AtEOXact_nbtree() --- clean up nbtree subsystem at xact abort or commit.
*/
void
AtEOXact_nbtree(void)
{
/* nothing to do at the moment */
}
/*
* btbuild() -- build a new btree index.
*

43
src/backend/access/rtree/rtscan.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/rtree/rtscan.c,v 1.52 2004/07/01 00:49:31 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/rtree/rtscan.c,v 1.53 2004/07/17 03:28:17 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -18,6 +18,7 @@
#include "access/genam.h"
#include "access/rtree.h"
#include "utils/lsyscache.h"
#include "utils/resowner.h"
/* routines defined and used here */
@ -42,7 +43,7 @@ static void adjustiptr(IndexScanDesc s, ItemPointer iptr,
typedef struct RTScanListData
{
IndexScanDesc rtsl_scan;
TransactionId rtsl_creatingXid;
ResourceOwner rtsl_owner;
struct RTScanListData *rtsl_next;
} RTScanListData;
@ -241,7 +242,7 @@ rtregscan(IndexScanDesc s)
l = (RTScanList) palloc(sizeof(RTScanListData));
l->rtsl_scan = s;
l->rtsl_creatingXid = GetCurrentTransactionId();
l->rtsl_owner = CurrentResourceOwner;
l->rtsl_next = RTScans;
RTScans = l;
}
@ -272,52 +273,28 @@ rtdropscan(IndexScanDesc s)
}
/*
* AtEOXact_rtree() --- clean up rtree subsystem at xact abort or commit.
* ReleaseResources_rtree() --- clean up rtree subsystem resources.
*
* This is here because it needs to touch this module's static var RTScans.
*/
void
AtEOXact_rtree(void)
{
/*
* Note: these actions should only be necessary during xact abort; but
* they can't hurt during a commit.
*/
/*
* Reset the active-scans list to empty. We do not need to free the
* list elements, because they're all palloc()'d, so they'll go away
* at end of transaction anyway.
*/
RTScans = NULL;
}
/*
* AtEOSubXact_rtree() --- clean up rtree subsystem at subxact abort or commit.
*
* This is here because it needs to touch this module's static var RTScans.
*/
void
AtEOSubXact_rtree(TransactionId childXid)
ReleaseResources_rtree(void)
{
RTScanList l;
RTScanList prev;
RTScanList next;
/*
* Note: these actions should only be necessary during xact abort; but
* they can't hurt during a commit.
*/
/*
* Forget active scans that were started in this subtransaction.
* Note: this should be a no-op during normal query shutdown.
* However, in an abort situation ExecutorEnd is not called and so
* there may be open index scans to clean up.
*/
prev = NULL;
for (l = RTScans; l != NULL; l = next)
{
next = l->rtsl_next;
if (l->rtsl_creatingXid == childXid)
if (l->rtsl_owner == CurrentResourceOwner)
{
if (prev == NULL)
RTScans = next;

380
src/backend/access/transam/xact.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.170 2004/07/01 20:11:02 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/xact.c,v 1.171 2004/07/17 03:28:23 tgl Exp $
*
* NOTES
* Transaction aborts can now occur two ways:
@ -144,10 +144,6 @@
#include <time.h>
#include <unistd.h>
#include "access/gistscan.h"
#include "access/hash.h"
#include "access/nbtree.h"
#include "access/rtree.h"
#include "access/subtrans.h"
#include "access/xact.h"
#include "catalog/heap.h"
@ -168,23 +164,73 @@
#include "utils/inval.h"
#include "utils/memutils.h"
#include "utils/portal.h"
#include "utils/catcache.h"
#include "utils/relcache.h"
#include "utils/resowner.h"
#include "pgstat.h"
/*
* transaction states - transaction state from server perspective
*/
typedef enum TransState
{
TRANS_DEFAULT,
TRANS_START,
TRANS_INPROGRESS,
TRANS_COMMIT,
TRANS_ABORT
} TransState;
/*
* transaction block states - transaction state of client queries
*/
typedef enum TBlockState
{
TBLOCK_DEFAULT,
TBLOCK_STARTED,
TBLOCK_BEGIN,
TBLOCK_INPROGRESS,
TBLOCK_END,
TBLOCK_ABORT,
TBLOCK_ENDABORT,
TBLOCK_SUBBEGIN,
TBLOCK_SUBBEGINABORT,
TBLOCK_SUBINPROGRESS,
TBLOCK_SUBEND,
TBLOCK_SUBABORT,
TBLOCK_SUBENDABORT_OK,
TBLOCK_SUBENDABORT_ERROR
} TBlockState;
/*
* transaction state structure
*/
typedef struct TransactionStateData
{
TransactionId transactionIdData; /* my XID */
CommandId commandId; /* current CID */
TransState state; /* low-level state */
TBlockState blockState; /* high-level state */
int nestingLevel; /* nest depth */
MemoryContext curTransactionContext; /* my xact-lifetime context */
ResourceOwner curTransactionOwner; /* my query resources */
List *childXids; /* subcommitted child XIDs */
AclId currentUser; /* subxact start current_user */
struct TransactionStateData *parent; /* back link to parent */
} TransactionStateData;
typedef TransactionStateData *TransactionState;
static void AbortTransaction(void);
static void AtAbort_Cache(void);
static void AtAbort_Locks(void);
static void AtAbort_Memory(void);
static void AtCleanup_Memory(void);
static void AtCommit_Cache(void);
static void AtCommit_LocalCache(void);
static void AtCommit_Locks(void);
static void AtCommit_Memory(void);
static void AtStart_Cache(void);
static void AtStart_Locks(void);
static void AtStart_Memory(void);
static void AtStart_ResourceOwner(void);
static void CallEOXactCallbacks(bool isCommit);
static void CleanupTransaction(void);
static void CommitTransaction(void);
@ -200,11 +246,11 @@ static void StartAbortedSubTransaction(void);
static void PushTransaction(void);
static void PopTransaction(void);
static void AtSubAbort_Locks(void);
static void AtSubAbort_Memory(void);
static void AtSubCleanup_Memory(void);
static void AtSubCommit_Memory(void);
static void AtSubStart_Memory(void);
static void AtSubStart_ResourceOwner(void);
static void ShowTransactionState(const char *str);
static void ShowTransactionStateRec(TransactionState state);
@ -224,6 +270,7 @@ static TransactionStateData TopTransactionStateData = {
* perspective */
0, /* nesting level */
NULL, /* cur transaction context */
NULL, /* cur transaction resource owner */
NIL, /* subcommitted child Xids */
0, /* entry-time current userid */
NULL /* link to parent state block */
@ -462,8 +509,7 @@ CommandCounterIncrement(void)
SerializableSnapshot->curcid = s->commandId;
/*
* make cache changes visible to me. AtCommit_LocalCache() instead of
* AtCommit_Cache() is called here.
* make cache changes visible to me.
*/
AtCommit_LocalCache();
AtStart_Cache();
@ -484,20 +530,6 @@ AtStart_Cache(void)
AcceptInvalidationMessages();
}
/*
* AtStart_Locks
*/
static void
AtStart_Locks(void)
{
/*
* at present, it is unknown to me what belongs here -cim 3/18/90
*
* There isn't anything to do at the start of a xact for locks. -mer
* 5/24/92
*/
}
/*
* AtStart_Memory
*/
@ -532,6 +564,29 @@ AtStart_Memory(void)
MemoryContextSwitchTo(CurTransactionContext);
}
/*
* AtStart_ResourceOwner
*/
static void
AtStart_ResourceOwner(void)
{
TransactionState s = CurrentTransactionState;
/*
* We shouldn't have a transaction resource owner already.
*/
Assert(TopTransactionResourceOwner == NULL);
/*
* Create a toplevel resource owner for the transaction.
*/
s->curTransactionOwner = ResourceOwnerCreate(NULL, "TopTransaction");
TopTransactionResourceOwner = s->curTransactionOwner;
CurTransactionResourceOwner = s->curTransactionOwner;
CurrentResourceOwner = s->curTransactionOwner;
}
/* ----------------------------------------------------------------
* StartSubTransaction stuff
* ----------------------------------------------------------------
@ -563,6 +618,28 @@ AtSubStart_Memory(void)
MemoryContextSwitchTo(CurTransactionContext);
}
/*
* AtSubStart_ResourceOwner
*/
static void
AtSubStart_ResourceOwner(void)
{
TransactionState s = CurrentTransactionState;
Assert(s->parent != NULL);
/*
* Create a resource owner for the subtransaction. We make it a
* child of the immediate parent's resource owner.
*/
s->curTransactionOwner =
ResourceOwnerCreate(s->parent->curTransactionOwner,
"SubTransaction");
CurTransactionResourceOwner = s->curTransactionOwner;
CurrentResourceOwner = s->curTransactionOwner;
}
/* ----------------------------------------------------------------
* CommitTransaction stuff
* ----------------------------------------------------------------
@ -581,7 +658,7 @@ RecordTransactionCommit(void)
/* Get data needed for commit record */
nrels = smgrGetPendingDeletes(true, &rptr);
nchildren = xactGetCommittedChildren(&children, false);
nchildren = xactGetCommittedChildren(&children);
/*
* If we made neither any XLOG entries nor any temp-rel updates,
@ -714,23 +791,6 @@ RecordTransactionCommit(void)
}
/*
* AtCommit_Cache
*/
static void
AtCommit_Cache(void)
{
/*
* Clean up the relation cache.
*/
AtEOXact_RelationCache(true);
/*
* Make catalog changes visible to all backends.
*/
AtEOXact_Inval(true);
}
/*
* AtCommit_LocalCache
*/
@ -743,20 +803,6 @@ AtCommit_LocalCache(void)
CommandEndInvalidationMessages();
}
/*
* AtCommit_Locks
*/
static void
AtCommit_Locks(void)
{
/*
* XXX What if ProcReleaseLocks fails? (race condition?)
*
* Then you're up a creek! -mer 5/24/92
*/
ProcReleaseLocks(ReleaseAllExceptSession, 0, NULL);
}
/*
* AtCommit_Memory
*/
@ -878,7 +924,7 @@ RecordTransactionAbort(void)
/* Get data needed for abort record */
nrels = smgrGetPendingDeletes(false, &rptr);
nchildren = xactGetCommittedChildren(&children, false);
nchildren = xactGetCommittedChildren(&children);
/*
* If we made neither any transaction-controlled XLOG entries nor any
@ -979,31 +1025,6 @@ RecordTransactionAbort(void)
pfree(children);
}
/*
* AtAbort_Cache
*/
static void
AtAbort_Cache(void)
{
AtEOXact_RelationCache(false);
AtEOXact_Inval(false);
}
/*
* AtAbort_Locks
*/
static void
AtAbort_Locks(void)
{
/*
* XXX What if ProcReleaseLocks() fails? (race condition?)
*
* Then you're up a creek without a paddle! -mer
*/
ProcReleaseLocks(ReleaseAll, 0, NULL);
}
/*
* AtAbort_Memory
*/
@ -1029,22 +1050,6 @@ AtAbort_Memory(void)
MemoryContextSwitchTo(TopMemoryContext);
}
/*
* AtSubAbort_Locks
*/
static void
AtSubAbort_Locks(void)
{
int nxids;
TransactionId *xids;
nxids = xactGetCommittedChildren(&xids, true);
ProcReleaseLocks(ReleaseGivenXids, nxids, xids);
pfree(xids);
}
/*
* AtSubAbort_Memory
@ -1070,7 +1075,7 @@ RecordSubTransactionAbort(void)
/* Get data needed for abort record */
nrels = smgrGetPendingDeletes(false, &rptr);
nchildren = xactGetCommittedChildren(&children, false);
nchildren = xactGetCommittedChildren(&children);
/*
* If we made neither any transaction-controlled XLOG entries nor any
@ -1241,6 +1246,12 @@ StartTransaction(void)
XactIsoLevel = DefaultXactIsoLevel;
XactReadOnly = DefaultXactReadOnly;
/*
* must initialize resource-management stuff first
*/
AtStart_Memory();
AtStart_ResourceOwner();
/*
* generate a new transaction id
*/
@ -1268,16 +1279,10 @@ StartTransaction(void)
*/
/*
* initialize the various transaction subsystems
* initialize other subsystems for new transaction
*/
AtStart_Memory();
AtStart_Inval();
AtStart_Cache();
AtStart_Locks();
/*
* Tell the trigger manager we're starting a transaction
*/
DeferredTriggerBeginXact();
/*
@ -1380,27 +1385,49 @@ CommitTransaction(void)
* pins); then release locks; then release backend-local resources. We
* want to release locks at the point where any backend waiting for us
* will see our transaction as being fully cleaned up.
*
* Resources that can be associated with individual queries are
* handled by the ResourceOwner mechanism. The other calls here
* are for backend-wide state.
*/
smgrDoPendingDeletes(true);
AtCommit_Cache();
AtEOXact_Buffers(true);
/* smgrcommit already done */
AtCommit_Locks();
ResourceOwnerRelease(TopTransactionResourceOwner,
RESOURCE_RELEASE_BEFORE_LOCKS,
true, true);
/*
* Make catalog changes visible to all backends. This has to happen
* after relcache references are dropped (see comments for
* AtEOXact_RelationCache), but before locks are released (if anyone
* is waiting for lock on a relation we've modified, we want them to
* know about the catalog change before they start using the relation).
*/
AtEOXact_Inval(true);
ResourceOwnerRelease(TopTransactionResourceOwner,
RESOURCE_RELEASE_LOCKS,
true, true);
ResourceOwnerRelease(TopTransactionResourceOwner,
RESOURCE_RELEASE_AFTER_LOCKS,
true, true);
CallEOXactCallbacks(true);
AtEOXact_GUC(true, false);
AtEOXact_SPI(true);
AtEOXact_gist();
AtEOXact_hash();
AtEOXact_nbtree();
AtEOXact_rtree();
AtEOXact_on_commit_actions(true, s->transactionIdData);
AtEOXact_Namespace(true);
AtEOXact_CatCache(true);
AtEOXact_Files();
pgstat_count_xact_commit();
CurrentResourceOwner = NULL;
ResourceOwnerDelete(TopTransactionResourceOwner);
s->curTransactionOwner = NULL;
CurTransactionResourceOwner = NULL;
TopTransactionResourceOwner = NULL;
AtCommit_Memory();
s->nestingLevel = 0;
@ -1504,22 +1531,24 @@ AbortTransaction(void)
*/
smgrDoPendingDeletes(false);
AtAbort_Cache();
AtEOXact_Buffers(false);
smgrabort();
AtAbort_Locks();
ResourceOwnerRelease(TopTransactionResourceOwner,
RESOURCE_RELEASE_BEFORE_LOCKS,
false, true);
AtEOXact_Inval(false);
ResourceOwnerRelease(TopTransactionResourceOwner,
RESOURCE_RELEASE_LOCKS,
false, true);
ResourceOwnerRelease(TopTransactionResourceOwner,
RESOURCE_RELEASE_AFTER_LOCKS,
false, true);
CallEOXactCallbacks(false);
AtEOXact_GUC(false, false);
AtEOXact_SPI(false);
AtEOXact_gist();
AtEOXact_hash();
AtEOXact_nbtree();
AtEOXact_rtree();
AtEOXact_on_commit_actions(false, s->transactionIdData);
AtEOXact_Namespace(false);
AtEOXact_CatCache(false);
AtEOXact_Files();
SetReindexProcessing(InvalidOid, InvalidOid);
pgstat_count_xact_rollback();
@ -1548,6 +1577,13 @@ CleanupTransaction(void)
* do abort cleanup processing
*/
AtCleanup_Portals(); /* now safe to release portal memory */
CurrentResourceOwner = NULL; /* and resource owner */
ResourceOwnerDelete(TopTransactionResourceOwner);
s->curTransactionOwner = NULL;
CurTransactionResourceOwner = NULL;
TopTransactionResourceOwner = NULL;
AtCleanup_Memory(); /* and transaction memory */
s->nestingLevel = 0;
@ -2483,6 +2519,12 @@ StartSubTransaction(void)
s->state = TRANS_START;
/*
* must initialize resource-management stuff first
*/
AtSubStart_Memory();
AtSubStart_ResourceOwner();
/*
* Generate a new Xid and record it in pg_subtrans.
*/
@ -2495,13 +2537,10 @@ StartSubTransaction(void)
*/
s->currentUser = GetUserId();
/* Initialize the various transaction subsystems */
AtSubStart_Memory();
/*
* Initialize other subsystems for new subtransaction
*/
AtSubStart_Inval();
AtSubStart_RelationCache();
AtSubStart_CatCache();
AtSubStart_Buffers();
AtSubStart_smgr();
AtSubStart_Notify();
DeferredTriggerBeginSubXact();
@ -2524,7 +2563,8 @@ CommitSubTransaction(void)
elog(WARNING, "CommitSubTransaction and not in in-progress state");
/* Pre-commit processing */
AtSubCommit_Portals(s->parent->transactionIdData);
AtSubCommit_Portals(s->parent->transactionIdData,
s->parent->curTransactionOwner);
DeferredTriggerEndSubXact(true);
s->state = TRANS_COMMIT;
@ -2539,17 +2579,31 @@ CommitSubTransaction(void)
AtSubEOXact_Inval(true);
AtEOSubXact_SPI(true, s->transactionIdData);
/*
* Note that we just release the resource owner's resources and don't
* delete it. This is because locks are not actually released here.
* The owner object continues to exist as a child of its parent owner
* (namely my parent transaction's resource owner), and the locks
* effectively become that owner object's responsibility.
*/
ResourceOwnerRelease(s->curTransactionOwner,
RESOURCE_RELEASE_BEFORE_LOCKS,
true, false);
/* we can skip the LOCKS phase */
ResourceOwnerRelease(s->curTransactionOwner,
RESOURCE_RELEASE_AFTER_LOCKS,
true, false);
AtSubCommit_Notify();
AtEOXact_GUC(true, true);
AtEOSubXact_gist(s->transactionIdData);
AtEOSubXact_hash(s->transactionIdData);
AtEOSubXact_rtree(s->transactionIdData);
AtEOSubXact_on_commit_actions(true, s->transactionIdData,
s->parent->transactionIdData);
AtEOSubXact_CatCache(true);
AtEOSubXact_RelationCache(true);
AtEOSubXact_Buffers(true);
CurrentResourceOwner = s->parent->curTransactionOwner;
CurTransactionResourceOwner = s->parent->curTransactionOwner;
s->curTransactionOwner = NULL;
AtSubCommit_Memory();
s->state = TRANS_DEFAULT;
@ -2597,20 +2651,25 @@ AbortSubTransaction(void)
AtSubAbort_smgr();
DeferredTriggerEndSubXact(false);
AtSubAbort_Portals();
AtSubEOXact_Inval(false);
AtSubAbort_Locks();
AtEOSubXact_SPI(false, s->transactionIdData);
AtSubAbort_Portals(s->parent->transactionIdData,
s->parent->curTransactionOwner);
AtSubEOXact_Inval(false);
ResourceOwnerRelease(s->curTransactionOwner,
RESOURCE_RELEASE_BEFORE_LOCKS,
false, false);
ResourceOwnerRelease(s->curTransactionOwner,
RESOURCE_RELEASE_LOCKS,
false, false);
ResourceOwnerRelease(s->curTransactionOwner,
RESOURCE_RELEASE_AFTER_LOCKS,
false, false);
AtSubAbort_Notify();
AtEOXact_GUC(false, true);
AtEOSubXact_gist(s->transactionIdData);
AtEOSubXact_hash(s->transactionIdData);
AtEOSubXact_rtree(s->transactionIdData);
AtEOSubXact_on_commit_actions(false, s->transactionIdData,
s->parent->transactionIdData);
AtEOSubXact_RelationCache(false);
AtEOSubXact_CatCache(false);
AtEOSubXact_Buffers(false);
/*
* Reset user id which might have been changed transiently. Here we
@ -2645,6 +2704,12 @@ CleanupSubTransaction(void)
elog(WARNING, "CleanupSubTransaction and not in aborted state");
AtSubCleanup_Portals();
CurrentResourceOwner = s->parent->curTransactionOwner;
CurTransactionResourceOwner = s->parent->curTransactionOwner;
ResourceOwnerDelete(s->curTransactionOwner);
s->curTransactionOwner = NULL;
AtSubCleanup_Memory();
s->state = TRANS_DEFAULT;
@ -2685,6 +2750,7 @@ StartAbortedSubTransaction(void)
* Initialize only what has to be there for CleanupSubTransaction to work.
*/
AtSubStart_Memory();
AtSubStart_ResourceOwner();
s->state = TRANS_ABORT;
@ -2723,6 +2789,7 @@ PushTransaction(void)
*/
s->transactionIdData = p->transactionIdData;
s->curTransactionContext = p->curTransactionContext;
s->curTransactionOwner = p->curTransactionOwner;
s->currentUser = p->currentUser;
CurrentTransactionState = s;
@ -2752,6 +2819,10 @@ PopTransaction(void)
CurTransactionContext = s->parent->curTransactionContext;
MemoryContextSwitchTo(CurTransactionContext);
/* Ditto for ResourceOwner links */
CurTransactionResourceOwner = s->parent->curTransactionOwner;
CurrentResourceOwner = s->parent->curTransactionOwner;
/* Free the old child structure */
pfree(s);
}
@ -2861,11 +2932,9 @@ TransStateAsString(TransState state)
* value is the number of child transactions. *children is set to point to a
* palloc'd array of TransactionIds. If there are no subxacts, *children is
* set to NULL.
*
* If metoo is true, include the current TransactionId.
*/
int
xactGetCommittedChildren(TransactionId **ptr, bool metoo)
xactGetCommittedChildren(TransactionId **ptr)
{
TransactionState s = CurrentTransactionState;
int nchildren;
@ -2873,8 +2942,6 @@ xactGetCommittedChildren(TransactionId **ptr, bool metoo)
ListCell *p;
nchildren = list_length(s->childXids);
if (metoo)
nchildren++;
if (nchildren == 0)
{
*ptr = NULL;
@ -2887,10 +2954,9 @@ xactGetCommittedChildren(TransactionId **ptr, bool metoo)
foreach(p, s->childXids)
{
TransactionId child = lfirst_int(p);
*children++ = (TransactionId)child;
*children++ = child;
}
if (metoo)
*children = s->transactionIdData;
return nchildren;
}

9
src/backend/bootstrap/bootparse.y
View File

@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/bootstrap/bootparse.y,v 1.70 2004/06/18 06:13:17 tgl Exp $
* $PostgreSQL: pgsql/src/backend/bootstrap/bootparse.y,v 1.71 2004/07/17 03:28:37 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -269,7 +269,12 @@ Boot_DeclareUniqueIndexStmt:
;
Boot_BuildIndsStmt:
XBUILD INDICES { build_indices(); }
XBUILD INDICES
{
do_start();
build_indices();
do_end();
}
;

50
src/backend/bootstrap/bootstrap.c
View File

@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/bootstrap/bootstrap.c,v 1.186 2004/07/11 00:18:43 momjian Exp $
* $PostgreSQL: pgsql/src/backend/bootstrap/bootstrap.c,v 1.187 2004/07/17 03:28:37 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -54,7 +54,6 @@ static void usage(void);
static void bootstrap_signals(void);
static hashnode *AddStr(char *str, int strlength, int mderef);
static Form_pg_attribute AllocateAttribute(void);
static bool BootstrapAlreadySeen(Oid id);
static int CompHash(char *str, int len);
static hashnode *FindStr(char *str, int length, hashnode *mderef);
static Oid gettype(char *type);
@ -880,34 +879,6 @@ InsertOneNull(int i)
Blanks[i] = 'n';
}
#define MORE_THAN_THE_NUMBER_OF_CATALOGS 256
static bool
BootstrapAlreadySeen(Oid id)
{
static Oid seenArray[MORE_THAN_THE_NUMBER_OF_CATALOGS];
static int nseen = 0;
bool seenthis;
int i;
seenthis = false;
for (i = 0; i < nseen; i++)
{
if (seenArray[i] == id)
{
seenthis = true;
break;
}
}
if (!seenthis)
{
seenArray[nseen] = id;
nseen++;
}
return seenthis;
}
/* ----------------
* cleanup
* ----------------
@ -1270,25 +1241,6 @@ build_indices(void)
* index, but in bootstrap mode it will not.
*/
/*
* All of the rest of this routine is needed only because in
* bootstrap processing we don't increment xact id's. The normal
* DefineIndex code replaces a pg_class tuple with updated info
* including the relhasindex flag (which we need to have updated).
* Unfortunately, there are always two indices defined on each
* catalog causing us to update the same pg_class tuple twice for
* each catalog getting an index during bootstrap resulting in the
* ghost tuple problem (see heap_update). To get around this we
* change the relhasindex field ourselves in this routine keeping
* track of what catalogs we already changed so that we don't
* modify those tuples twice. The normal mechanism for updating
* pg_class is disabled during bootstrap.
*
* -mer
*/
if (!BootstrapAlreadySeen(RelationGetRelid(heap)))
UpdateStats(RelationGetRelid(heap), 0);
/* XXX Probably we ought to close the heap and index here? */
}
}

4
src/backend/catalog/pg_proc.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/catalog/pg_proc.c,v 1.116 2004/05/26 04:41:08 neilc Exp $
* $PostgreSQL: pgsql/src/backend/catalog/pg_proc.c,v 1.117 2004/07/17 03:28:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -847,7 +847,7 @@ function_parse_error_transpose(const char *prosrc)
}
/* We can get the original query text from the active portal (hack...) */
Assert(ActivePortal && ActivePortal->portalActive);
Assert(ActivePortal && ActivePortal->status == PORTAL_ACTIVE);
queryText = ActivePortal->sourceText;
/* Try to locate the prosrc in the original text */

42
src/backend/commands/portalcmds.c
View File

@ -14,7 +14,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/portalcmds.c,v 1.28 2004/06/11 01:08:37 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/portalcmds.c,v 1.29 2004/07/17 03:28:47 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -233,7 +233,7 @@ PerformPortalClose(const char *name)
* for portals.
*/
void
PortalCleanup(Portal portal, bool isError)
PortalCleanup(Portal portal)
{
QueryDesc *queryDesc;
@ -253,8 +253,16 @@ PortalCleanup(Portal portal, bool isError)
if (queryDesc)
{
portal->queryDesc = NULL;
if (!isError)
if (portal->status != PORTAL_FAILED)
{
ResourceOwner saveResourceOwner;
/* We must make the portal's resource owner current */
saveResourceOwner = CurrentResourceOwner;
CurrentResourceOwner = portal->resowner;
ExecutorEnd(queryDesc);
CurrentResourceOwner = saveResourceOwner;
}
}
}
@ -271,6 +279,7 @@ PersistHoldablePortal(Portal portal)
{
QueryDesc *queryDesc = PortalGetQueryDesc(portal);
Portal saveActivePortal;
ResourceOwner saveResourceOwner;
MemoryContext savePortalContext;
MemoryContext saveQueryContext;
MemoryContext oldcxt;
@ -281,8 +290,6 @@ PersistHoldablePortal(Portal portal)
*/
Assert(portal->createXact == GetCurrentTransactionId());
Assert(queryDesc != NULL);
Assert(portal->portalReady);
Assert(!portal->portalDone);
/*
* Caller must have created the tuplestore already.
@ -303,17 +310,19 @@ PersistHoldablePortal(Portal portal)
/*
* Check for improper portal use, and mark portal active.
*/
if (portal->portalActive)
if (portal->status != PORTAL_READY)
ereport(ERROR,
(errcode(ERRCODE_OBJECT_IN_USE),
errmsg("portal \"%s\" already active", portal->name)));
portal->portalActive = true;
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("portal \"%s\" cannot be run", portal->name)));
portal->status = PORTAL_ACTIVE;
/*
* Set global portal context pointers.
*/
saveActivePortal = ActivePortal;
ActivePortal = portal;
saveResourceOwner = CurrentResourceOwner;
CurrentResourceOwner = portal->resowner;
savePortalContext = PortalContext;
PortalContext = PortalGetHeapMemory(portal);
saveQueryContext = QueryContext;
@ -342,13 +351,6 @@ PersistHoldablePortal(Portal portal)
portal->queryDesc = NULL; /* prevent double shutdown */
ExecutorEnd(queryDesc);
/* Mark portal not active */
portal->portalActive = false;
ActivePortal = saveActivePortal;
PortalContext = savePortalContext;
QueryContext = saveQueryContext;
/*
* Reset the position in the result set: ideally, this could be
* implemented by just skipping straight to the tuple # that we need
@ -394,4 +396,12 @@ PersistHoldablePortal(Portal portal)
* portal's heap via PortalContext.
*/
MemoryContextDeleteChildren(PortalGetHeapMemory(portal));
/* Mark portal not active */
portal->status = PORTAL_READY;
ActivePortal = saveActivePortal;
CurrentResourceOwner = saveResourceOwner;
PortalContext = savePortalContext;
QueryContext = saveQueryContext;
}

255
src/backend/storage/buffer/bufmgr.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.172 2004/07/01 00:50:46 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/buffer/bufmgr.c,v 1.173 2004/07/17 03:28:49 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -45,8 +45,8 @@
#include "storage/bufpage.h"
#include "storage/proc.h"
#include "storage/smgr.h"
#include "utils/memutils.h"
#include "utils/relcache.h"
#include "utils/resowner.h"
#include "pgstat.h"
@ -65,13 +65,9 @@ long NDirectFileRead; /* some I/O's are direct file access.
* bypass bufmgr */
long NDirectFileWrite; /* e.g., I/O in psort and hashjoin. */
/* List of upper-level-transaction buffer refcount arrays */
static List *upperRefCounts = NIL;
static void PinBuffer(BufferDesc *buf);
static void UnpinBuffer(BufferDesc *buf);
static void BufferFixLeak(Buffer bufnum, int32 shouldBe, bool emitWarning);
static void PinBuffer(BufferDesc *buf, bool fixOwner);
static void UnpinBuffer(BufferDesc *buf, bool fixOwner);
static void WaitIO(BufferDesc *buf);
static void StartBufferIO(BufferDesc *buf, bool forInput);
static void TerminateBufferIO(BufferDesc *buf, int err_flag);
@ -103,6 +99,7 @@ static void write_buffer(Buffer buffer, bool unpin);
Buffer
ReadBuffer(Relation reln, BlockNumber blockNum)
{
ResourceOwnerEnlargeBuffers(CurrentResourceOwner);
return ReadBufferInternal(reln, blockNum, false);
}
@ -111,6 +108,8 @@ ReadBuffer(Relation reln, BlockNumber blockNum)
*
* bufferLockHeld: if true, caller already acquired the bufmgr lock.
* (This is assumed never to be true if dealing with a local buffer!)
*
* The caller must have done ResourceOwnerEnlargeBuffers(CurrentResourceOwner)
*/
static Buffer
ReadBufferInternal(Relation reln, BlockNumber blockNum,
@ -287,7 +286,7 @@ BufferAlloc(Relation reln,
*/
*foundPtr = TRUE;
PinBuffer(buf);
PinBuffer(buf, true);
if (!(buf->flags & BM_VALID))
{
@ -337,6 +336,9 @@ BufferAlloc(Relation reln,
buf->refcount = 1;
PrivateRefCount[BufferDescriptorGetBuffer(buf) - 1] = 1;
ResourceOwnerRememberBuffer(CurrentResourceOwner,
BufferDescriptorGetBuffer(buf));
if ((buf->flags & BM_VALID) &&
(buf->flags & BM_DIRTY || buf->cntxDirty))
{
@ -382,7 +384,7 @@ BufferAlloc(Relation reln,
* buffer we were planning to use.
*/
TerminateBufferIO(buf, 0);
UnpinBuffer(buf);
UnpinBuffer(buf, true);
buf = buf2;
@ -390,7 +392,7 @@ BufferAlloc(Relation reln,
*foundPtr = TRUE;
PinBuffer(buf);
PinBuffer(buf, true);
if (!(buf->flags & BM_VALID))
{
@ -425,7 +427,7 @@ BufferAlloc(Relation reln,
if (buf->refcount > 1 || buf->flags & BM_DIRTY || buf->cntxDirty)
{
TerminateBufferIO(buf, 0);
UnpinBuffer(buf);
UnpinBuffer(buf, true);
inProgress = FALSE;
buf = NULL;
}
@ -497,7 +499,7 @@ write_buffer(Buffer buffer, bool release)
bufHdr->flags |= (BM_DIRTY | BM_JUST_DIRTIED);
if (release)
UnpinBuffer(bufHdr);
UnpinBuffer(bufHdr, true);
LWLockRelease(BufMgrLock);
}
@ -561,6 +563,8 @@ ReleaseAndReadBuffer(Buffer buffer,
if (bufHdr->tag.blockNum == blockNum &&
RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node))
return buffer;
ResourceOwnerForgetBuffer(CurrentResourceOwner, buffer);
/* owner now has a free slot, so no need for Enlarge() */
LocalRefCount[-buffer - 1]--;
}
else
@ -570,16 +574,20 @@ ReleaseAndReadBuffer(Buffer buffer,
if (bufHdr->tag.blockNum == blockNum &&
RelFileNodeEquals(bufHdr->tag.rnode, relation->rd_node))
return buffer;
ResourceOwnerForgetBuffer(CurrentResourceOwner, buffer);
/* owner now has a free slot, so no need for Enlarge() */
if (PrivateRefCount[buffer - 1] > 1)
PrivateRefCount[buffer - 1]--;
else
{
LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
UnpinBuffer(bufHdr);
UnpinBuffer(bufHdr, false);
return ReadBufferInternal(relation, blockNum, true);
}
}
}
else
ResourceOwnerEnlargeBuffers(CurrentResourceOwner);
return ReadBufferInternal(relation, blockNum, false);
}
@ -589,9 +597,12 @@ ReleaseAndReadBuffer(Buffer buffer,
*
* This should be applied only to shared buffers, never local ones.
* Bufmgr lock must be held by caller.
*
* Most but not all callers want CurrentResourceOwner to be adjusted.
* Note that ResourceOwnerEnlargeBuffers must have been done already.
*/
static void
PinBuffer(BufferDesc *buf)
PinBuffer(BufferDesc *buf, bool fixOwner)
{
int b = BufferDescriptorGetBuffer(buf) - 1;
@ -599,6 +610,9 @@ PinBuffer(BufferDesc *buf)
buf->refcount++;
PrivateRefCount[b]++;
Assert(PrivateRefCount[b] > 0);
if (fixOwner)
ResourceOwnerRememberBuffer(CurrentResourceOwner,
BufferDescriptorGetBuffer(buf));
}
/*
@ -606,12 +620,18 @@ PinBuffer(BufferDesc *buf)
*
* This should be applied only to shared buffers, never local ones.
* Bufmgr lock must be held by caller.
*
* Most but not all callers want CurrentResourceOwner to be adjusted.
*/
static void
UnpinBuffer(BufferDesc *buf)
UnpinBuffer(BufferDesc *buf, bool fixOwner)
{
int b = BufferDescriptorGetBuffer(buf) - 1;
if (fixOwner)
ResourceOwnerForgetBuffer(CurrentResourceOwner,
BufferDescriptorGetBuffer(buf));
Assert(buf->refcount > 0);
Assert(PrivateRefCount[b] > 0);
PrivateRefCount[b]--;
@ -677,6 +697,9 @@ BufferSync(int percent, int maxpages)
if (maxpages > 0 && num_buffer_dirty > maxpages)
num_buffer_dirty = maxpages;
/* Make sure we can handle the pin inside the loop */
ResourceOwnerEnlargeBuffers(CurrentResourceOwner);
/*
* Loop over buffers to be written. Note the BufMgrLock is held at
* loop top, but is released and reacquired within FlushBuffer,
@ -724,13 +747,13 @@ BufferSync(int percent, int maxpages)
* buffer now and set IO state for it *before* acquiring shlock to
* avoid conflicts with FlushRelationBuffers.
*/
PinBuffer(bufHdr);
PinBuffer(bufHdr, true);
StartBufferIO(bufHdr, false);
FlushBuffer(bufHdr, NULL);
TerminateBufferIO(bufHdr, 0);
UnpinBuffer(bufHdr);
UnpinBuffer(bufHdr, true);
}
LWLockRelease(BufMgrLock);
@ -831,104 +854,34 @@ AtEOXact_Buffers(bool isCommit)
for (i = 0; i < NBuffers; i++)
{
if (PrivateRefCount[i] != 0)
BufferFixLeak(i, 0, isCommit);
{
BufferDesc *buf = &(BufferDescriptors[i]);
if (isCommit)
elog(WARNING,
"buffer refcount leak: [%03d] "
"(rel=%u/%u/%u, blockNum=%u, flags=0x%x, refcount=%u %d)",
i,
buf->tag.rnode.spcNode, buf->tag.rnode.dbNode,
buf->tag.rnode.relNode,
buf->tag.blockNum, buf->flags,
buf->refcount, PrivateRefCount[i]);
/*
* We don't worry about updating the ResourceOwner structures;
* resowner.c will clear them for itself.
*/
PrivateRefCount[i] = 1; /* make sure we release shared pin */
LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
UnpinBuffer(buf, false);
LWLockRelease(BufMgrLock);
Assert(PrivateRefCount[i] == 0);
}
}
AtEOXact_LocalBuffers(isCommit);
}
/*
* During subtransaction start, save buffer reference counts.
*/
void
AtSubStart_Buffers(void)
{
int32 *copyRefCounts;
Size rcSize;
MemoryContext old_cxt;
/* this is probably the active context already, but be safe */
old_cxt = MemoryContextSwitchTo(CurTransactionContext);
/*
* We need to copy the current state of PrivateRefCount[]. In the typical
* scenario, few if any of the entries will be nonzero, and we could save
* space by storing only the nonzero ones. However, copying the whole
* thing is lots simpler and faster both here and in AtEOSubXact_Buffers,
* so it seems best to waste the space.
*/
rcSize = NBuffers * sizeof(int32);
copyRefCounts = (int32 *) palloc(rcSize);
memcpy(copyRefCounts, PrivateRefCount, rcSize);
/* Attach to list */
upperRefCounts = lcons(copyRefCounts, upperRefCounts);
MemoryContextSwitchTo(old_cxt);
}
/*
* AtEOSubXact_Buffers
*
* At subtransaction end, we restore the saved counts. If committing, we
* complain if the refcounts don't match; if aborting, just restore silently.
*/
void
AtEOSubXact_Buffers(bool isCommit)
{
int32 *oldRefCounts;
int i;
oldRefCounts = (int32 *) linitial(upperRefCounts);
upperRefCounts = list_delete_first(upperRefCounts);
for (i = 0; i < NBuffers; i++)
{
if (PrivateRefCount[i] != oldRefCounts[i])
BufferFixLeak(i, oldRefCounts[i], isCommit);
}
pfree(oldRefCounts);
}
/*
* Fix a buffer refcount leak.
*
* The caller does not hold the BufMgrLock.
*/
static void
BufferFixLeak(Buffer bufnum, int32 shouldBe, bool emitWarning)
{
BufferDesc *buf = &(BufferDescriptors[bufnum]);
if (emitWarning)
elog(WARNING,
"buffer refcount leak: [%03d] (rel=%u/%u/%u, blockNum=%u, flags=0x%x, refcount=%u %d, should be=%d)",
bufnum,
buf->tag.rnode.spcNode, buf->tag.rnode.dbNode,
buf->tag.rnode.relNode,
buf->tag.blockNum, buf->flags,
buf->refcount, PrivateRefCount[bufnum], shouldBe);
/* If it's less, we're in a heap o' trouble */
if (PrivateRefCount[bufnum] <= shouldBe)
elog(FATAL, "buffer refcount was decreased by subtransaction");
if (shouldBe > 0)
{
/* We still keep the shared-memory pin */
PrivateRefCount[bufnum] = shouldBe;
}
else
{
PrivateRefCount[bufnum] = 1; /* make sure we release shared pin */
LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
UnpinBuffer(buf);
LWLockRelease(BufMgrLock);
Assert(PrivateRefCount[bufnum] == 0);
}
}
/*
* FlushBufferPool
*
@ -1172,9 +1125,15 @@ DropRelFileNodeBuffers(RelFileNode rnode, bool istemp,
if (RelFileNodeEquals(bufHdr->tag.rnode, rnode) &&
bufHdr->tag.blockNum >= firstDelBlock)
{
if (LocalRefCount[i] != 0)
elog(FATAL, "block %u of %u/%u/%u is still referenced (local %u)",
bufHdr->tag.blockNum,
bufHdr->tag.rnode.spcNode,
bufHdr->tag.rnode.dbNode,
bufHdr->tag.rnode.relNode,
LocalRefCount[i]);
bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
bufHdr->cntxDirty = false;
LocalRefCount[i] = 0;
bufHdr->tag.rnode.relNode = InvalidOid;
}
}
@ -1205,29 +1164,22 @@ recheck:
*/
goto recheck;
}
/*
* There should be no pin on the buffer.
*/
if (bufHdr->refcount != 0)
elog(FATAL, "block %u of %u/%u/%u is still referenced (private %d, global %u)",
bufHdr->tag.blockNum,
bufHdr->tag.rnode.spcNode,
bufHdr->tag.rnode.dbNode,
bufHdr->tag.rnode.relNode,
PrivateRefCount[i - 1], bufHdr->refcount);
/* Now we can do what we came for */
bufHdr->flags &= ~(BM_DIRTY | BM_JUST_DIRTIED);
bufHdr->cntxDirty = false;
/*
* Release any refcount we may have. If someone else has a
* pin on the buffer, we got trouble.
*/
if (bufHdr->refcount != 0)
{
/* the sole pin should be ours */
if (bufHdr->refcount != 1 || PrivateRefCount[i - 1] == 0)
elog(FATAL, "block %u of %u/%u/%u is still referenced (private %d, global %u)",
bufHdr->tag.blockNum,
bufHdr->tag.rnode.spcNode,
bufHdr->tag.rnode.dbNode,
bufHdr->tag.rnode.relNode,
PrivateRefCount[i - 1], bufHdr->refcount);
/* Make sure it will be released */
PrivateRefCount[i - 1] = 1;
UnpinBuffer(bufHdr);
}
/*
* And mark the buffer as no longer occupied by this rel.
*/
@ -1353,7 +1305,7 @@ PrintPinnedBufs(void)
for (i = 0; i < NBuffers; ++i, ++buf)
{
if (PrivateRefCount[i] > 0)
elog(WARNING,
elog(NOTICE,
"[%02d] (freeNext=%d, freePrev=%d, rel=%u/%u/%u, "
"blockNum=%u, flags=0x%x, refcount=%u %d)",
i, buf->freeNext, buf->freePrev,
@ -1456,6 +1408,9 @@ FlushRelationBuffers(Relation rel, BlockNumber firstDelBlock)
return;
}
/* Make sure we can handle the pin inside the loop */
ResourceOwnerEnlargeBuffers(CurrentResourceOwner);
LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
for (i = 0; i < NBuffers; i++)
@ -1466,7 +1421,7 @@ FlushRelationBuffers(Relation rel, BlockNumber firstDelBlock)
if ((bufHdr->flags & BM_VALID) &&
(bufHdr->flags & BM_DIRTY || bufHdr->cntxDirty))
{
PinBuffer(bufHdr);
PinBuffer(bufHdr, true);
/* Someone else might be flushing buffer */
if (bufHdr->flags & BM_IO_IN_PROGRESS)
WaitIO(bufHdr);
@ -1479,7 +1434,7 @@ FlushRelationBuffers(Relation rel, BlockNumber firstDelBlock)
TerminateBufferIO(bufHdr, 0);
}
UnpinBuffer(bufHdr);
UnpinBuffer(bufHdr, true);
if (bufHdr->flags & BM_DIRTY || bufHdr->cntxDirty)
elog(ERROR, "FlushRelationBuffers(\"%s\", %u): block %u was re-dirtied",
RelationGetRelationName(rel), firstDelBlock,
@ -1507,6 +1462,8 @@ ReleaseBuffer(Buffer buffer)
{
BufferDesc *bufHdr;
ResourceOwnerForgetBuffer(CurrentResourceOwner, buffer);
if (BufferIsLocal(buffer))
{
Assert(LocalRefCount[-buffer - 1] > 0);
@ -1526,11 +1483,39 @@ ReleaseBuffer(Buffer buffer)
else
{
LWLockAcquire(BufMgrLock, LW_EXCLUSIVE);
UnpinBuffer(bufHdr);
UnpinBuffer(bufHdr, false);
LWLockRelease(BufMgrLock);
}
}
/*
* IncrBufferRefCount
* Increment the pin count on a buffer that we have *already* pinned
* at least once.
*
* This function cannot be used on a buffer we do not have pinned,
* because it doesn't change the shared buffer state. Therefore the
* Assert checks are for refcount > 0. Someone got this wrong once...
*/
void
IncrBufferRefCount(Buffer buffer)
{
ResourceOwnerEnlargeBuffers(CurrentResourceOwner);
ResourceOwnerRememberBuffer(CurrentResourceOwner, buffer);
if (BufferIsLocal(buffer))
{
Assert(buffer >= -NLocBuffer);
Assert(LocalRefCount[-buffer - 1] > 0);
LocalRefCount[-buffer - 1]++;
}
else
{
Assert(!BAD_BUFFER_ID(buffer));
Assert(PrivateRefCount[buffer - 1] > 0);
PrivateRefCount[buffer - 1]++;
}
}
#ifdef NOT_USED
void
IncrBufferRefCount_Debug(char *file, int line, Buffer buffer)

8
src/backend/storage/buffer/localbuf.c
View File

@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/buffer/localbuf.c,v 1.56 2004/06/18 06:13:33 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/buffer/localbuf.c,v 1.57 2004/07/17 03:28:49 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -19,6 +19,7 @@
#include "storage/bufmgr.h"
#include "storage/smgr.h"
#include "utils/relcache.h"
#include "utils/resowner.h"
/*#define LBDEBUG*/
@ -62,6 +63,8 @@ LocalBufferAlloc(Relation reln, BlockNumber blockNum, bool *foundPtr)
#endif
LocalRefCount[i]++;
ResourceOwnerRememberBuffer(CurrentResourceOwner,
BufferDescriptorGetBuffer(bufHdr));
if (bufHdr->flags & BM_VALID)
*foundPtr = TRUE;
else
@ -88,6 +91,8 @@ LocalBufferAlloc(Relation reln, BlockNumber blockNum, bool *foundPtr)
{
bufHdr = &LocalBufferDescriptors[b];
LocalRefCount[b]++;
ResourceOwnerRememberBuffer(CurrentResourceOwner,
BufferDescriptorGetBuffer(bufHdr));
nextFreeLocalBuf = (b + 1) % NLocBuffer;
break;
}
@ -179,6 +184,7 @@ WriteLocalBuffer(Buffer buffer, bool release)
{
Assert(LocalRefCount[bufid] > 0);
LocalRefCount[bufid]--;
ResourceOwnerForgetBuffer(CurrentResourceOwner, buffer);
}
}

53
src/backend/storage/lmgr/lock.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/lmgr/lock.c,v 1.134 2004/07/01 00:50:59 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/lmgr/lock.c,v 1.135 2004/07/17 03:28:51 tgl Exp $
*
* NOTES
* Outside modules can create a lock table and acquire/release
@ -30,14 +30,15 @@
*/
#include "postgres.h"
#include <unistd.h>
#include <signal.h>
#include <unistd.h>
#include "access/xact.h"
#include "miscadmin.h"
#include "storage/proc.h"
#include "utils/memutils.h"
#include "utils/ps_status.h"
#include "utils/resowner.h"
/* This configuration variable is used to set the lock table size */
@ -424,6 +425,9 @@ LockAcquire(LOCKMETHODID lockmethodid, LOCKTAG *locktag,
/* ???????? This must be changed when short term locks will be used */
locktag->lockmethodid = lockmethodid;
/* Prepare to record the lock in the current resource owner */
ResourceOwnerEnlargeLocks(CurrentResourceOwner);
Assert(lockmethodid < NumLockMethods);
lockMethodTable = LockMethods[lockmethodid];
if (!lockMethodTable)
@ -567,6 +571,8 @@ LockAcquire(LOCKMETHODID lockmethodid, LOCKTAG *locktag,
if (proclock->holding[lockmode] > 0)
{
GrantLock(lock, proclock, lockmode);
ResourceOwnerRememberLock(CurrentResourceOwner, locktag, xid,
lockmode);
PROCLOCK_PRINT("LockAcquire: owning", proclock);
LWLockRelease(masterLock);
return TRUE;
@ -580,6 +586,8 @@ LockAcquire(LOCKMETHODID lockmethodid, LOCKTAG *locktag,
if (myHolding[lockmode] > 0)
{
GrantLock(lock, proclock, lockmode);
ResourceOwnerRememberLock(CurrentResourceOwner, locktag, xid,
lockmode);
PROCLOCK_PRINT("LockAcquire: my other XID owning", proclock);
LWLockRelease(masterLock);
return TRUE;
@ -601,6 +609,8 @@ LockAcquire(LOCKMETHODID lockmethodid, LOCKTAG *locktag,
{
/* No conflict with held or previously requested locks */
GrantLock(lock, proclock, lockmode);
ResourceOwnerRememberLock(CurrentResourceOwner, locktag, xid,
lockmode);
}
else
{
@ -803,6 +813,9 @@ LockCountMyLocks(SHMEM_OFFSET lockOffset, PGPROC *proc, int *myHolding)
*
* NOTE: if proc was blocked, it also needs to be removed from the wait list
* and have its waitLock/waitHolder fields cleared. That's not done here.
*
* NOTE: the lock also has to be recorded in the current ResourceOwner;
* but since we may be awaking some other process, we can't do that here.
*/
void
GrantLock(LOCK *lock, PROCLOCK *proclock, LOCKMODE lockmode)
@ -964,6 +977,9 @@ LockRelease(LOCKMETHODID lockmethodid, LOCKTAG *locktag,
/* ???????? This must be changed when short term locks will be used */
locktag->lockmethodid = lockmethodid;
/* Record release of the lock in the current resource owner */
ResourceOwnerForgetLock(CurrentResourceOwner, locktag, xid, lockmode);
Assert(lockmethodid < NumLockMethods);
lockMethodTable = LockMethods[lockmethodid];
if (!lockMethodTable)
@ -1134,20 +1150,15 @@ LockRelease(LOCKMETHODID lockmethodid, LOCKTAG *locktag,
*
* Well, not necessarily *all* locks. The available behaviors are:
*
* which == ReleaseAll: release all locks regardless of transaction
* allxids == true: release all locks regardless of transaction
* affiliation.
*
* which == ReleaseAllExceptSession: release all locks with Xid != 0
* allxids == false: release all locks with Xid != 0
* (zero is the Xid used for "session" locks).
*
* which == ReleaseGivenXids: release only locks whose Xids appear in
* the xids[] array (of length nxids).
*
* xids/nxids are ignored when which != ReleaseGivenXids.
*/
bool
LockReleaseAll(LOCKMETHODID lockmethodid, PGPROC *proc,
LockReleaseWhich which, int nxids, TransactionId *xids)
bool allxids)
{
SHM_QUEUE *procHolders = &(proc->procHolders);
PROCLOCK *proclock;
@ -1196,25 +1207,9 @@ LockReleaseAll(LOCKMETHODID lockmethodid, PGPROC *proc,
if (LOCK_LOCKMETHOD(*lock) != lockmethodid)
goto next_item;
if (which == ReleaseGivenXids)
{
/* Ignore locks with an Xid not in the list */
bool release = false;
for (i = 0; i < nxids; i++)
{
if (TransactionIdEquals(proclock->tag.xid, xids[i]))
{
release = true;
break;
}
}
if (!release)
goto next_item;
}
/* Ignore locks with Xid=0 unless we are asked to release All locks */
else if (TransactionIdEquals(proclock->tag.xid, InvalidTransactionId)
&& which != ReleaseAll)
/* Ignore locks with Xid=0 unless we are asked to release all locks */
if (TransactionIdEquals(proclock->tag.xid, InvalidTransactionId)
&& !allxids)
goto next_item;
PROCLOCK_PRINT("LockReleaseAll", proclock);

110
src/backend/storage/lmgr/proc.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/lmgr/proc.c,v 1.149 2004/07/01 00:50:59 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/lmgr/proc.c,v 1.150 2004/07/17 03:28:51 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -40,7 +40,6 @@
*/
#include "postgres.h"
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#include <sys/time.h>
@ -51,6 +50,8 @@
#include "storage/proc.h"
#include "storage/sinval.h"
#include "storage/spin.h"
#include "utils/resowner.h"
/* GUC variables */
int DeadlockTimeout = 1000;
@ -75,6 +76,11 @@ static PGPROC *DummyProcs = NULL;
static bool waitingForLock = false;
static bool waitingForSignal = false;
/* Auxiliary state, valid when waitingForLock is true */
static LOCKTAG waitingForLockTag;
static TransactionId waitingForLockXid;
static LOCKMODE waitingForLockMode;
/* Mark these volatile because they can be changed by signal handler */
static volatile bool statement_timeout_active = false;
static volatile bool deadlock_timeout_active = false;
@ -234,7 +240,7 @@ InitProcess(void)
* prepared for us by InitProcGlobal.
*/
SHMQueueElemInit(&(MyProc->links));
MyProc->errType = STATUS_OK;
MyProc->waitStatus = STATUS_OK;
MyProc->xid = InvalidTransactionId;
MyProc->xmin = InvalidTransactionId;
MyProc->pid = MyProcPid;
@ -308,7 +314,7 @@ InitDummyProcess(int proctype)
*/
MyProc->pid = MyProcPid; /* marks dummy proc as in use by me */
SHMQueueElemInit(&(MyProc->links));
MyProc->errType = STATUS_OK;
MyProc->waitStatus = STATUS_OK;
MyProc->xid = InvalidTransactionId;
MyProc->xmin = InvalidTransactionId;
MyProc->databaseId = MyDatabaseId;
@ -348,15 +354,40 @@ LockWaitCancel(void)
if (!waitingForLock)
return false;
waitingForLock = false;
/* Turn off the deadlock timer, if it's still running (see ProcSleep) */
disable_sig_alarm(false);
/* Unlink myself from the wait queue, if on it (might not be anymore!) */
LWLockAcquire(LockMgrLock, LW_EXCLUSIVE);
if (MyProc->links.next != INVALID_OFFSET)
{
/* We could not have been granted the lock yet */
Assert(MyProc->waitStatus == STATUS_ERROR);
RemoveFromWaitQueue(MyProc);
}
else
{
/*
* Somebody kicked us off the lock queue already. Perhaps they
* granted us the lock, or perhaps they detected a deadlock.
* If they did grant us the lock, we'd better remember it in
* CurrentResourceOwner.
*
* Exception: if CurrentResourceOwner is NULL then we can't do
* anything. This could only happen when we are invoked from ProcKill
* or some similar place, where all our locks are about to be released
* anyway.
*/
if (MyProc->waitStatus == STATUS_OK && CurrentResourceOwner != NULL)
ResourceOwnerRememberLock(CurrentResourceOwner,
&waitingForLockTag,
waitingForLockXid,
waitingForLockMode);
}
waitingForLock = false;
LWLockRelease(LockMgrLock);
/*
@ -380,34 +411,29 @@ LockWaitCancel(void)
/*
* ProcReleaseLocks() -- release locks associated with current transaction
* at main transaction and subtransaction commit or abort
*
* The options for which locks to release are the same as for the underlying
* LockReleaseAll() function.
*
* Notes:
* at main transaction commit or abort
*
* At main transaction commit, we release all locks except session locks.
* At main transaction abort, we release all locks including session locks;
* this lets us clean up after a VACUUM FULL failure.
*
* At subtransaction commit, we don't release any locks (so this func is not
* called at all); we will defer the releasing to the parent transaction.
* needed at all); we will defer the releasing to the parent transaction.
* At subtransaction abort, we release all locks held by the subtransaction;
* this is implemented by passing in the Xids of the failed subxact and its
* children in the xids[] array.
* this is implemented by retail releasing of the locks under control of
* the ResourceOwner mechanism.
*
* Note that user locks are not released in any case.
*/
void
ProcReleaseLocks(LockReleaseWhich which, int nxids, TransactionId *xids)
ProcReleaseLocks(bool isCommit)
{
if (!MyProc)
return;
/* If waiting, get off wait queue (should only be needed after error) */
LockWaitCancel();
/* Release locks */
LockReleaseAll(DEFAULT_LOCKMETHOD, MyProc, which, nxids, xids);
LockReleaseAll(DEFAULT_LOCKMETHOD, MyProc, !isCommit);
}
@ -440,11 +466,11 @@ ProcKill(int code, Datum arg)
LockWaitCancel();
/* Remove from the standard lock table */
LockReleaseAll(DEFAULT_LOCKMETHOD, MyProc, ReleaseAll, 0, NULL);
LockReleaseAll(DEFAULT_LOCKMETHOD, MyProc, true);
#ifdef USER_LOCKS
/* Remove from the user lock table */
LockReleaseAll(USER_LOCKMETHOD, MyProc, ReleaseAll, 0, NULL);
LockReleaseAll(USER_LOCKMETHOD, MyProc, true);
#endif
SpinLockAcquire(ProcStructLock);
@ -618,6 +644,10 @@ ProcSleep(LockMethod lockMethodTable,
{
/* Skip the wait and just grant myself the lock. */
GrantLock(lock, proclock, lockmode);
ResourceOwnerRememberLock(CurrentResourceOwner,
&lock->tag,
proclock->tag.xid,
lockmode);
return STATUS_OK;
}
/* Break out of loop to put myself before him */
@ -653,7 +683,7 @@ ProcSleep(LockMethod lockMethodTable,
MyProc->waitHolder = proclock;
MyProc->waitLockMode = lockmode;
MyProc->errType = STATUS_OK; /* initialize result for success */
MyProc->waitStatus = STATUS_ERROR; /* initialize result for error */
/*
* If we detected deadlock, give up without waiting. This must agree
@ -663,11 +693,13 @@ ProcSleep(LockMethod lockMethodTable,
if (early_deadlock)
{
RemoveFromWaitQueue(MyProc);
MyProc->errType = STATUS_ERROR;
return STATUS_ERROR;
}
/* mark that we are waiting for a lock */
waitingForLockTag = lock->tag;
waitingForLockXid = proclock->tag.xid;
waitingForLockMode = lockmode;
waitingForLock = true;
/*
@ -683,7 +715,7 @@ ProcSleep(LockMethod lockMethodTable,
/*
* Set timer so we can wake up after awhile and check for a deadlock.
* If a deadlock is detected, the handler releases the process's
* semaphore and sets MyProc->errType = STATUS_ERROR, allowing us to
* semaphore and sets MyProc->waitStatus = STATUS_ERROR, allowing us to
* know that we must report failure rather than success.
*
* By delaying the check until we've waited for a bit, we can avoid
@ -703,8 +735,10 @@ ProcSleep(LockMethod lockMethodTable,
* We pass interruptOK = true, which eliminates a window in which
* cancel/die interrupts would be held off undesirably. This is a
* promise that we don't mind losing control to a cancel/die interrupt
* here. We don't, because we have no state-change work to do after
* being granted the lock (the grantor did it all).
* here. We don't, because we have no shared-state-change work to do
* after being granted the lock (the grantor did it all). We do have
* to worry about updating the local CurrentResourceOwner, but if we
* lose control to an error, LockWaitCancel will fix that up.
*/
PGSemaphoreLock(&MyProc->sem, true);
@ -715,20 +749,32 @@ ProcSleep(LockMethod lockMethodTable,
elog(FATAL, "could not disable timer for process wakeup");
/*
* Now there is nothing for LockWaitCancel to do.
* Re-acquire the locktable's masterLock. We have to do this to hold
* off cancel/die interrupts before we can mess with waitingForLock
* (else we might have a missed or duplicated CurrentResourceOwner
* update).
*/
LWLockAcquire(masterLock, LW_EXCLUSIVE);
/*
* We no longer want LockWaitCancel to do anything.
*/
waitingForLock = false;
/*
* Re-acquire the locktable's masterLock.
* If we got the lock, be sure to remember it in CurrentResourceOwner.
*/
LWLockAcquire(masterLock, LW_EXCLUSIVE);
if (MyProc->waitStatus == STATUS_OK)
ResourceOwnerRememberLock(CurrentResourceOwner,
&lock->tag,
proclock->tag.xid,
lockmode);
/*
* We don't have to do anything else, because the awaker did all the
* necessary update of the lock table and MyProc.
*/
return MyProc->errType;
return MyProc->waitStatus;
}
@ -743,7 +789,7 @@ ProcSleep(LockMethod lockMethodTable,
* to twiddle the lock's request counts too --- see RemoveFromWaitQueue.
*/
PGPROC *
ProcWakeup(PGPROC *proc, int errType)
ProcWakeup(PGPROC *proc, int waitStatus)
{
PGPROC *retProc;
@ -764,7 +810,7 @@ ProcWakeup(PGPROC *proc, int errType)
/* Clean up process' state and pass it the ok/fail signal */
proc->waitLock = NULL;
proc->waitHolder = NULL;
proc->errType = errType;
proc->waitStatus = waitStatus;
/* And awaken it */
PGSemaphoreUnlock(&proc->sem);
@ -891,10 +937,10 @@ CheckDeadLock(void)
RemoveFromWaitQueue(MyProc);
/*
* Set MyProc->errType to STATUS_ERROR so that ProcSleep will report
* Set MyProc->waitStatus to STATUS_ERROR so that ProcSleep will report
* an error after we return from the signal handler.
*/
MyProc->errType = STATUS_ERROR;
MyProc->waitStatus = STATUS_ERROR;
/*
* Unlock my semaphore so that the interrupted ProcSleep() call can

145
src/backend/storage/smgr/smgr.c
View File

@ -11,12 +11,13 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/smgr/smgr.c,v 1.76 2004/07/11 19:52:51 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/smgr/smgr.c,v 1.77 2004/07/17 03:28:55 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/xact.h"
#include "commands/tablespace.h"
#include "storage/bufmgr.h"
#include "storage/freespace.h"
@ -81,10 +82,15 @@ static HTAB *SMgrRelationHash = NULL;
* executed immediately, but is just entered in the list. When and if
* the transaction commits, we can delete the physical file.
*
* The list is kept in CurTransactionContext. In subtransactions, each
* subtransaction has its own list in its own CurTransactionContext, but
* successful subtransactions attach their lists to their parent's list.
* Failed subtransactions can immediately execute the abort-time actions.
* To handle subtransactions, every entry is marked with its transaction
* nesting level. At subtransaction commit, we reassign the subtransaction's
* entries to the parent nesting level. At subtransaction abort, we can
* immediately execute the abort-time actions for all entries of the current
* nesting level.
*
* NOTE: the list is kept in TopMemoryContext to be sure it won't disappear
* unbetimes. It'd probably be OK to keep it in TopTransactionContext,
* but I'm being paranoid.
*/
typedef struct PendingRelDelete
@ -93,11 +99,11 @@ typedef struct PendingRelDelete
int which; /* which storage manager? */
bool isTemp; /* is it a temporary relation? */
bool atCommit; /* T=delete at commit; F=delete at abort */
int nestLevel; /* xact nesting level of request */
struct PendingRelDelete *next; /* linked-list link */
} PendingRelDelete;
static List *pendingDeletes = NIL; /* head of linked list */
static List *upperPendingDeletes = NIL; /* list of upper-xact lists */
static PendingRelDelete *pendingDeletes = NULL; /* head of linked list */
/*
@ -308,7 +314,6 @@ smgrcreate(SMgrRelation reln, bool isTemp, bool isRedo)
XLogRecData rdata;
xl_smgr_create xlrec;
PendingRelDelete *pending;
MemoryContext old_cxt;
/*
* We may be using the target table space for the first time in this
@ -349,17 +354,15 @@ smgrcreate(SMgrRelation reln, bool isTemp, bool isRedo)
lsn = XLogInsert(RM_SMGR_ID, XLOG_SMGR_CREATE | XLOG_NO_TRAN, &rdata);
/* Add the relation to the list of stuff to delete at abort */
old_cxt = MemoryContextSwitchTo(CurTransactionContext);
pending = (PendingRelDelete *) palloc(sizeof(PendingRelDelete));
pending = (PendingRelDelete *)
MemoryContextAlloc(TopMemoryContext, sizeof(PendingRelDelete));
pending->relnode = reln->smgr_rnode;
pending->which = reln->smgr_which;
pending->isTemp = isTemp;
pending->atCommit = false; /* delete if abort */
pendingDeletes = lcons(pending, pendingDeletes);
MemoryContextSwitchTo(old_cxt);
pending->nestLevel = GetCurrentTransactionNestLevel();
pending->next = pendingDeletes;
pendingDeletes = pending;
}
/*
@ -374,20 +377,17 @@ void
smgrscheduleunlink(SMgrRelation reln, bool isTemp)
{
PendingRelDelete *pending;
MemoryContext old_cxt;
/* Add the relation to the list of stuff to delete at commit */
old_cxt = MemoryContextSwitchTo(CurTransactionContext);
pending = (PendingRelDelete *) palloc(sizeof(PendingRelDelete));
pending = (PendingRelDelete *)
MemoryContextAlloc(TopMemoryContext, sizeof(PendingRelDelete));
pending->relnode = reln->smgr_rnode;
pending->which = reln->smgr_which;
pending->isTemp = isTemp;
pending->atCommit = true; /* delete if commit */
pendingDeletes = lcons(pending, pendingDeletes);
MemoryContextSwitchTo(old_cxt);
pending->nestLevel = GetCurrentTransactionNestLevel();
pending->next = pendingDeletes;
pendingDeletes = pending;
/*
* NOTE: if the relation was created in this transaction, it will now
@ -647,25 +647,45 @@ smgrimmedsync(SMgrRelation reln)
/*
* smgrDoPendingDeletes() -- Take care of relation deletes at end of xact.
*
* This also runs when aborting a subxact; we want to clean up a failed
* subxact immediately.
*/
void
smgrDoPendingDeletes(bool isCommit)
{
ListCell *p;
int nestLevel = GetCurrentTransactionNestLevel();
PendingRelDelete *pending;
PendingRelDelete *prev;
PendingRelDelete *next;
foreach(p, pendingDeletes)
prev = NULL;
for (pending = pendingDeletes; pending != NULL; pending = next)
{
PendingRelDelete *pending = lfirst(p);
if (pending->atCommit == isCommit)
smgr_internal_unlink(pending->relnode,
pending->which,
pending->isTemp,
false);
next = pending->next;
if (pending->nestLevel < nestLevel)
{
/* outer-level entries should not be processed yet */
prev = pending;
}
else
{
/* unlink list entry first, so we don't retry on failure */
if (prev)
prev->next = next;
else
pendingDeletes = next;
/* do deletion if called for */
if (pending->atCommit == isCommit)
smgr_internal_unlink(pending->relnode,
pending->which,
pending->isTemp,
false);
/* must explicitly free the list entry */
pfree(pending);
/* prev does not change */
}
}
/* We needn't free the cells since they are in CurTransactionContext */
pendingDeletes = NIL;
}
/*
@ -681,16 +701,15 @@ smgrDoPendingDeletes(bool isCommit)
int
smgrGetPendingDeletes(bool forCommit, RelFileNode **ptr)
{
int nestLevel = GetCurrentTransactionNestLevel();
int nrels;
RelFileNode *rptr;
ListCell *p;
PendingRelDelete *pending;
nrels = 0;
foreach(p, pendingDeletes)
for (pending = pendingDeletes; pending != NULL; pending = pending->next)
{
PendingRelDelete *pending = lfirst(p);
if (pending->atCommit == forCommit)
if (pending->nestLevel >= nestLevel && pending->atCommit == forCommit)
nrels++;
}
if (nrels == 0)
@ -700,50 +719,30 @@ smgrGetPendingDeletes(bool forCommit, RelFileNode **ptr)
}
rptr = (RelFileNode *) palloc(nrels * sizeof(RelFileNode));
*ptr = rptr;
foreach(p, pendingDeletes)
for (pending = pendingDeletes; pending != NULL; pending = pending->next)
{
PendingRelDelete *pending = lfirst(p);
if (pending->atCommit == forCommit)
if (pending->nestLevel >= nestLevel && pending->atCommit == forCommit)
*rptr++ = pending->relnode;
}
return nrels;
}
/*
* AtSubStart_smgr() --- Take care of subtransaction start.
*
* Push empty state for the new subtransaction.
*/
void
AtSubStart_smgr(void)
{
MemoryContext old_cxt;
/* Keep the list-of-lists in TopTransactionContext for simplicity */
old_cxt = MemoryContextSwitchTo(TopTransactionContext);
upperPendingDeletes = lcons(pendingDeletes, upperPendingDeletes);
pendingDeletes = NIL;
MemoryContextSwitchTo(old_cxt);
}
/*
* AtSubCommit_smgr() --- Take care of subtransaction commit.
*
* Reassign all items in the pending deletes list to the parent transaction.
* Reassign all items in the pending-deletes list to the parent transaction.
*/
void
AtSubCommit_smgr(void)
{
List *parentPendingDeletes;
int nestLevel = GetCurrentTransactionNestLevel();
PendingRelDelete *pending;
parentPendingDeletes = (List *) linitial(upperPendingDeletes);
upperPendingDeletes = list_delete_first(upperPendingDeletes);
pendingDeletes = list_concat(parentPendingDeletes, pendingDeletes);
for (pending = pendingDeletes; pending != NULL; pending = pending->next)
{
if (pending->nestLevel >= nestLevel)
pending->nestLevel = nestLevel - 1;
}
}
/*
@ -757,10 +756,6 @@ void
AtSubAbort_smgr(void)
{
smgrDoPendingDeletes(false);
/* Must pop the stack, too */
pendingDeletes = (List *) linitial(upperPendingDeletes);
upperPendingDeletes = list_delete_first(upperPendingDeletes);
}
/*

8
src/backend/tcop/postgres.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.423 2004/07/11 00:18:44 momjian Exp $
* $PostgreSQL: pgsql/src/backend/tcop/postgres.c,v 1.424 2004/07/17 03:29:00 tgl Exp $
*
* NOTES
* this is the "main" module of the postgres backend and
@ -2796,6 +2796,12 @@ PostgresMain(int argc, char *argv[], const char *username)
DisableCatchupInterrupt();
debug_query_string = NULL;
/*
* If there's an active portal, mark it as failed
*/
if (ActivePortal)
ActivePortal->status = PORTAL_FAILED;
/*
* Make sure we are in a valid memory context during recovery.
*

71
src/backend/tcop/pquery.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tcop/pquery.c,v 1.80 2004/06/05 19:48:08 tgl Exp $
* $PostgreSQL: pgsql/src/backend/tcop/pquery.c,v 1.81 2004/07/17 03:29:00 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -235,12 +235,25 @@ ChoosePortalStrategy(List *parseTrees)
void
PortalStart(Portal portal, ParamListInfo params)
{
Portal saveActivePortal;
ResourceOwner saveResourceOwner;
MemoryContext savePortalContext;
MemoryContext oldContext;
QueryDesc *queryDesc;
AssertArg(PortalIsValid(portal));
AssertState(portal->queryContext != NULL); /* query defined? */
AssertState(!portal->portalReady); /* else extra PortalStart */
AssertState(portal->status == PORTAL_NEW); /* else extra PortalStart */
/*
* Set global portal context pointers. (Should we set QueryContext?)
*/
saveActivePortal = ActivePortal;
ActivePortal = portal;
saveResourceOwner = CurrentResourceOwner;
CurrentResourceOwner = portal->resowner;
savePortalContext = PortalContext;
PortalContext = PortalGetHeapMemory(portal);
oldContext = MemoryContextSwitchTo(PortalGetHeapMemory(portal));
@ -324,7 +337,11 @@ PortalStart(Portal portal, ParamListInfo params)
MemoryContextSwitchTo(oldContext);
portal->portalReady = true;
ActivePortal = saveActivePortal;
CurrentResourceOwner = saveResourceOwner;
PortalContext = savePortalContext;
portal->status = PORTAL_READY;
}
/*
@ -403,12 +420,12 @@ PortalRun(Portal portal, long count,
{
bool result;
Portal saveActivePortal;
ResourceOwner saveResourceOwner;
MemoryContext savePortalContext;
MemoryContext saveQueryContext;
MemoryContext oldContext;
AssertArg(PortalIsValid(portal));
AssertState(portal->portalReady); /* else no PortalStart */
/* Initialize completion tag to empty string */
if (completionTag)
@ -425,21 +442,19 @@ PortalRun(Portal portal, long count,
/*
* Check for improper portal use, and mark portal active.
*/
if (portal->portalDone)
if (portal->status != PORTAL_READY)
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("portal \"%s\" cannot be run anymore", portal->name)));
if (portal->portalActive)
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("portal \"%s\" already active", portal->name)));
portal->portalActive = true;
errmsg("portal \"%s\" cannot be run", portal->name)));
portal->status = PORTAL_ACTIVE;
/*
* Set global portal context pointers.
*/
saveActivePortal = ActivePortal;
ActivePortal = portal;
saveResourceOwner = CurrentResourceOwner;
CurrentResourceOwner = portal->resowner;
savePortalContext = PortalContext;
PortalContext = PortalGetHeapMemory(portal);
saveQueryContext = QueryContext;
@ -455,6 +470,9 @@ PortalRun(Portal portal, long count,
if (completionTag && portal->commandTag)
strcpy(completionTag, portal->commandTag);
/* Mark portal not active */
portal->status = PORTAL_READY;
/*
* Since it's a forward fetch, say DONE iff atEnd is now true.
*/
@ -491,6 +509,9 @@ PortalRun(Portal portal, long count,
if (completionTag && portal->commandTag)
strcpy(completionTag, portal->commandTag);
/* Mark portal not active */
portal->status = PORTAL_READY;
/*
* Since it's a forward fetch, say DONE iff atEnd is now true.
*/
@ -499,6 +520,10 @@ PortalRun(Portal portal, long count,
case PORTAL_MULTI_QUERY:
PortalRunMulti(portal, dest, altdest, completionTag);
/* Prevent portal's commands from being re-executed */
portal->status = PORTAL_DONE;
/* Always complete at end of RunMulti */
result = true;
break;
@ -512,10 +537,8 @@ PortalRun(Portal portal, long count,
MemoryContextSwitchTo(oldContext);
/* Mark portal not active */
portal->portalActive = false;
ActivePortal = saveActivePortal;
CurrentResourceOwner = saveResourceOwner;
PortalContext = savePortalContext;
QueryContext = saveQueryContext;
@ -914,9 +937,6 @@ PortalRunMulti(Portal portal,
else if (strcmp(completionTag, "DELETE") == 0)
strcpy(completionTag, "DELETE 0");
}
/* Prevent portal's commands from being re-executed */
portal->portalDone = true;
}
/*
@ -933,31 +953,29 @@ PortalRunFetch(Portal portal,
{
long result;
Portal saveActivePortal;
ResourceOwner saveResourceOwner;
MemoryContext savePortalContext;
MemoryContext saveQueryContext;
MemoryContext oldContext;
AssertArg(PortalIsValid(portal));
AssertState(portal->portalReady); /* else no PortalStart */
/*
* Check for improper portal use, and mark portal active.
*/
if (portal->portalDone)
if (portal->status != PORTAL_READY)
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("portal \"%s\" cannot be run anymore", portal->name)));
if (portal->portalActive)
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("portal \"%s\" already active", portal->name)));
portal->portalActive = true;
errmsg("portal \"%s\" cannot be run", portal->name)));
portal->status = PORTAL_ACTIVE;
/*
* Set global portal context pointers.
*/
saveActivePortal = ActivePortal;
ActivePortal = portal;
saveResourceOwner = CurrentResourceOwner;
CurrentResourceOwner = portal->resowner;
savePortalContext = PortalContext;
PortalContext = PortalGetHeapMemory(portal);
saveQueryContext = QueryContext;
@ -980,9 +998,10 @@ PortalRunFetch(Portal portal,
MemoryContextSwitchTo(oldContext);
/* Mark portal not active */
portal->portalActive = false;
portal->status = PORTAL_READY;
ActivePortal = saveActivePortal;
CurrentResourceOwner = saveResourceOwner;
PortalContext = savePortalContext;
QueryContext = saveQueryContext;

4
src/backend/utils/Makefile
View File

@ -1,14 +1,14 @@
#
# Makefile for utils
#
# $PostgreSQL: pgsql/src/backend/utils/Makefile,v 1.22 2004/01/04 05:57:21 tgl Exp $
# $PostgreSQL: pgsql/src/backend/utils/Makefile,v 1.23 2004/07/17 03:29:15 tgl Exp $
#
subdir = src/backend/utils/
top_builddir = ../../..
include $(top_builddir)/src/Makefile.global
SUBDIRS := adt cache error fmgr hash init misc mmgr sort time mb
SUBDIRS := adt cache error fmgr hash init mb misc mmgr resowner sort time
SUBDIROBJS := $(SUBDIRS:%=%/SUBSYS.o)

232
src/backend/utils/cache/catcache.c vendored
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/cache/catcache.c,v 1.113 2004/07/01 00:51:17 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/cache/catcache.c,v 1.114 2004/07/17 03:29:25 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -31,6 +31,7 @@
#include "utils/fmgroids.h"
#include "utils/catcache.h"
#include "utils/relcache.h"
#include "utils/resowner.h"
#include "utils/syscache.h"
@ -360,8 +361,6 @@ CatCacheRemoveCTup(CatCache *cache, CatCTup *ct)
/* free associated tuple data */
if (ct->tuple.t_data != NULL)
pfree(ct->tuple.t_data);
if (ct->prev_refcount != NULL)
pfree(ct->prev_refcount);
pfree(ct);
--cache->cc_ntup;
@ -396,8 +395,6 @@ CatCacheRemoveCList(CatCache *cache, CatCList *cl)
/* free associated tuple data */
if (cl->tuple.t_data != NULL)
pfree(cl->tuple.t_data);
if (cl->prev_refcount != NULL)
pfree(cl->prev_refcount);
pfree(cl);
}
@ -531,7 +528,7 @@ CreateCacheMemoryContext(void)
/*
* AtEOXact_CatCache
*
* Clean up catcaches at end of transaction (either commit or abort)
* Clean up catcaches at end of main transaction (either commit or abort)
*
* We scan the caches to reset refcounts to zero. This is of course
* necessary in the abort case, since elog() may have interrupted routines.
@ -564,13 +561,6 @@ AtEOXact_CatCache(bool isCommit)
cl->refcount = 0;
}
/*
* Reset the refcount stack. Drop the item count to zero,
* but don't deallocate the stack itself, so it can be used by
* future subtransactions.
*/
cl->numpushes = 0;
/* Clean up any now-deletable dead entries */
if (cl->dead)
CatCacheRemoveCList(ccp, cl);
@ -596,174 +586,12 @@ AtEOXact_CatCache(bool isCommit)
ct->refcount = 0;
}
/*
* Reset the refcount stack. Drop the item count to zero,
* but don't deallocate the stack itself, so it can be used by
* future subtransactions.
*/
ct->numpushes = 0;
/* Clean up any now-deletable dead entries */
if (ct->dead)
CatCacheRemoveCTup(ct->my_cache, ct);
}
}
/*
* AtSubStart_CatCache
*
* Saves reference counts of each entry at subtransaction start so they
* can be restored if the subtransaction later aborts.
*/
void
AtSubStart_CatCache(void)
{
CatCache *ccp;
Dlelem *elt,
*nextelt;
MemoryContext old_cxt;
old_cxt = MemoryContextSwitchTo(CacheMemoryContext);
/*
* Prepare CLists
*/
for (ccp = CacheHdr->ch_caches; ccp; ccp = ccp->cc_next)
{
for (elt = DLGetHead(&ccp->cc_lists); elt; elt = nextelt)
{
CatCList *cl = (CatCList *) DLE_VAL(elt);
nextelt = DLGetSucc(elt);
if (cl->numpushes == cl->numalloc)
{
if (cl->numalloc == 0)
{
cl->numalloc = 8;
cl->prev_refcount = palloc(sizeof(int) * cl->numalloc);
}
else
{
cl->numalloc *= 2;
cl->prev_refcount = repalloc(cl->prev_refcount, cl->numalloc * sizeof(int));
}
}
cl->prev_refcount[cl->numpushes++] = cl->refcount;
}
}
/*
* Prepare CTuples
*/
for (elt = DLGetHead(&CacheHdr->ch_lrulist); elt; elt = nextelt)
{
CatCTup *ct = (CatCTup *) DLE_VAL(elt);
nextelt = DLGetSucc(elt);
if (ct->numpushes == ct->numalloc)
{
if (ct->numalloc == 0)
{
ct->numalloc = 8;
ct->prev_refcount = palloc(sizeof(int) * ct->numalloc);
}
else
{
ct->numalloc *= 2;
ct->prev_refcount = repalloc(ct->prev_refcount, sizeof(int) * ct->numalloc);
}
}
ct->prev_refcount[ct->numpushes++] = ct->refcount;
}
MemoryContextSwitchTo(old_cxt);
}
void
AtEOSubXact_CatCache(bool isCommit)
{
CatCache *ccp;
Dlelem *elt,
*nextelt;
/*
* Restore CLists
*/
for (ccp = CacheHdr->ch_caches; ccp; ccp = ccp->cc_next)
{
for (elt = DLGetHead(&ccp->cc_lists); elt; elt = nextelt)
{
CatCList *cl = (CatCList *) DLE_VAL(elt);
nextelt = DLGetSucc(elt);
/*
* During commit, check whether the count is what
* we expect.
*/
if (isCommit)
{
int expected_refcount;
if (cl->numpushes > 0)
expected_refcount = cl->prev_refcount[cl->numpushes - 1];
else
expected_refcount = 0;
if (cl->refcount != expected_refcount)
elog(WARNING, "catcache reference leak");
}
/*
* During abort we have to restore the original count;
* during commit, we have to restore in case of a leak,
* and it won't harm if this is the expected count.
*/
if (cl->numpushes > 0)
cl->refcount = cl->prev_refcount[--cl->numpushes];
else
cl->refcount = 0;
}
}
/*
* Prepare CTuples
*/
for (elt = DLGetHead(&CacheHdr->ch_lrulist); elt; elt = nextelt)
{
CatCTup *ct = (CatCTup *) DLE_VAL(elt);
nextelt = DLGetSucc(elt);
if (isCommit)
{
int expected_refcount;
if (ct->numpushes > 0)
expected_refcount = ct->prev_refcount[ct->numpushes - 1];
else
expected_refcount = 0;
if (ct->refcount != expected_refcount)
elog(WARNING, "catcache reference leak");
}
/*
* During abort we have to restore the original count;
* during commit, we have to restore in case of a leak,
* and it won't harm if this is the expected count.
*/
if (ct->numpushes > 0)
ct->refcount = ct->prev_refcount[--ct->numpushes];
else
ct->refcount = 0;
}
}
/*
* ResetCatalogCache
*
@ -1334,7 +1162,9 @@ SearchCatCache(CatCache *cache,
*/
if (!ct->negative)
{
ResourceOwnerEnlargeCatCacheRefs(CurrentResourceOwner);
ct->refcount++;
ResourceOwnerRememberCatCacheRef(CurrentResourceOwner, &ct->tuple);
CACHE3_elog(DEBUG2, "SearchCatCache(%s): found in bucket %d",
cache->cc_relname, hashIndex);
@ -1389,6 +1219,10 @@ SearchCatCache(CatCache *cache,
ct = CatalogCacheCreateEntry(cache, ntp,
hashValue, hashIndex,
false);
/* immediately set the refcount to 1 */
ResourceOwnerEnlargeCatCacheRefs(CurrentResourceOwner);
ct->refcount++;
ResourceOwnerRememberCatCacheRef(CurrentResourceOwner, &ct->tuple);
break; /* assume only one match */
}
@ -1415,10 +1249,9 @@ SearchCatCache(CatCache *cache,
cache->cc_relname, hashIndex);
/*
* We are not returning the new entry to the caller, so reset its
* refcount.
* We are not returning the negative entry to the caller, so leave
* its refcount zero.
*/
ct->refcount = 0; /* negative entries never have refs */
return NULL;
}
@ -1457,6 +1290,7 @@ ReleaseCatCache(HeapTuple tuple)
Assert(ct->refcount > 0);
ct->refcount--;
ResourceOwnerForgetCatCacheRef(CurrentResourceOwner, &ct->tuple);
if (ct->refcount == 0
#ifndef CATCACHE_FORCE_RELEASE
@ -1564,7 +1398,10 @@ SearchCatCacheList(CatCache *cache,
* do not move the members to the fronts of their hashbucket
* lists, however, since there's no point in that unless they are
* searched for individually.) Also bump the members' refcounts.
* (member refcounts are NOT registered separately with the
* resource owner.)
*/
ResourceOwnerEnlargeCatCacheListRefs(CurrentResourceOwner);
for (i = 0; i < cl->n_members; i++)
{
cl->members[i]->refcount++;
@ -1574,6 +1411,7 @@ SearchCatCacheList(CatCache *cache,
/* Bump the list's refcount and return it */
cl->refcount++;
ResourceOwnerRememberCatCacheListRef(CurrentResourceOwner, cl);
CACHE2_elog(DEBUG2, "SearchCatCacheList(%s): found list",
cache->cc_relname);
@ -1639,9 +1477,7 @@ SearchCatCacheList(CatCache *cache,
if (ct->c_list)
continue;
/* Found a match, so bump its refcount and move to front */
ct->refcount++;
/* Found a match, so move it to front */
DLMoveToFront(&ct->lrulist_elem);
break;
@ -1655,6 +1491,16 @@ SearchCatCacheList(CatCache *cache,
false);
}
/*
* We have to bump the member refcounts immediately to ensure they
* won't get dropped from the cache while loading other members.
* If we get an error before we finish constructing the CatCList
* then we will leak those reference counts. This is annoying but
* it has no real consequence beyond possibly generating some
* warning messages at the next transaction commit, so it's not
* worth fixing.
*/
ct->refcount++;
ctlist = lcons(ct, ctlist);
nmembers++;
}
@ -1677,10 +1523,7 @@ SearchCatCacheList(CatCache *cache,
cl->cl_magic = CL_MAGIC;
cl->my_cache = cache;
DLInitElem(&cl->cache_elem, (void *) cl);
cl->refcount = 1; /* count this first reference */
cl->prev_refcount = NULL;
cl->numpushes = 0;
cl->numalloc = 0;
cl->refcount = 0; /* for the moment */
cl->dead = false;
cl->ordered = ordered;
cl->nkeys = nkeys;
@ -1704,6 +1547,11 @@ SearchCatCacheList(CatCache *cache,
CACHE3_elog(DEBUG2, "SearchCatCacheList(%s): made list of %d members",
cache->cc_relname, nmembers);
/* Finally, bump the list's refcount and return it */
ResourceOwnerEnlargeCatCacheListRefs(CurrentResourceOwner);
cl->refcount++;
ResourceOwnerRememberCatCacheListRef(CurrentResourceOwner, cl);
return cl;
}
@ -1735,6 +1583,7 @@ ReleaseCatCacheList(CatCList *list)
}
list->refcount--;
ResourceOwnerForgetCatCacheListRef(CurrentResourceOwner, list);
if (list->refcount == 0
#ifndef CATCACHE_FORCE_RELEASE
@ -1748,7 +1597,7 @@ ReleaseCatCacheList(CatCList *list)
/*
* CatalogCacheCreateEntry
* Create a new CatCTup entry, copying the given HeapTuple and other
* supplied data into it. The new entry is given refcount 1.
* supplied data into it. The new entry initially has refcount 0.
*/
static CatCTup *
CatalogCacheCreateEntry(CatCache *cache, HeapTuple ntp,
@ -1775,13 +1624,10 @@ CatalogCacheCreateEntry(CatCache *cache, HeapTuple ntp,
DLInitElem(&ct->lrulist_elem, (void *) ct);
DLInitElem(&ct->cache_elem, (void *) ct);
ct->c_list = NULL;
ct->refcount = 1; /* count this first reference */
ct->refcount = 0; /* for the moment */
ct->dead = false;
ct->negative = negative;
ct->hash_value = hashValue;
ct->prev_refcount = NULL;
ct->numpushes = 0;
ct->numalloc = 0;
DLAddHead(&CacheHdr->ch_lrulist, &ct->lrulist_elem);
DLAddHead(&cache->cc_bucket[hashIndex], &ct->cache_elem);
@ -1791,8 +1637,8 @@ CatalogCacheCreateEntry(CatCache *cache, HeapTuple ntp,
/*
* If we've exceeded the desired size of the caches, try to throw away
* the least recently used entry. NB: the newly-built entry cannot
* get thrown away here, because it has positive refcount.
* the least recently used entry. NB: be careful not to throw away
* the newly-built entry...
*/
if (CacheHdr->ch_ntup > CacheHdr->ch_maxtup)
{
@ -1805,7 +1651,7 @@ CatalogCacheCreateEntry(CatCache *cache, HeapTuple ntp,
prevelt = DLGetPred(elt);
if (oldct->refcount == 0)
if (oldct->refcount == 0 && oldct != ct)
{
CACHE2_elog(DEBUG2, "CatCacheCreateEntry(%s): Overflow, LRU removal",
cache->cc_relname);

207
src/backend/utils/cache/relcache.c vendored
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/cache/relcache.c,v 1.206 2004/07/01 00:51:17 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/cache/relcache.c,v 1.207 2004/07/17 03:29:25 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -62,6 +62,7 @@
#include "utils/inval.h"
#include "utils/lsyscache.h"
#include "utils/relcache.h"
#include "utils/resowner.h"
#include "utils/syscache.h"
#include "utils/typcache.h"
@ -273,8 +274,6 @@ static void IndexSupportInitialize(Form_pg_index iform,
static OpClassCacheEnt *LookupOpclassInfo(Oid operatorClassOid,
StrategyNumber numStrats,
StrategyNumber numSupport);
static inline void RelationPushReferenceCount(Relation rel);
static inline void RelationPopReferenceCount(Relation rel);
/*
@ -829,17 +828,13 @@ RelationBuildDesc(RelationBuildDescInfo buildinfo,
*/
RelationGetRelid(relation) = relid;
/*
* initialize relation->rd_refcnt
*/
RelationSetReferenceCount(relation, 1);
/*
* normal relations are not nailed into the cache; nor can a
* pre-existing relation be new. It could be temp though. (Actually,
* it could be new too, but it's okay to forget that fact if forced to
* flush the entry.)
*/
relation->rd_refcnt = 0;
relation->rd_isnailed = 0;
relation->rd_isnew = false;
relation->rd_istemp = isTempNamespace(relation->rd_rel->relnamespace);
@ -1280,9 +1275,9 @@ formrdesc(const char *relationName,
relation->rd_smgr = NULL;
/*
* initialize reference count
* initialize reference count: 1 because it is nailed in cache
*/
RelationSetReferenceCount(relation, 1);
relation->rd_refcnt = 1;
/*
* all entries built with this routine are nailed-in-cache; none are
@ -1487,6 +1482,8 @@ RelationIdGetRelation(Oid relationId)
buildinfo.i.info_id = relationId;
rd = RelationBuildDesc(buildinfo, NULL);
if (RelationIsValid(rd))
RelationIncrementReferenceCount(rd);
return rd;
}
@ -1516,6 +1513,8 @@ RelationSysNameGetRelation(const char *relationName)
buildinfo.i.info_name = (char *) relationName;
rd = RelationBuildDesc(buildinfo, NULL);
if (RelationIsValid(rd))
RelationIncrementReferenceCount(rd);
return rd;
}
@ -1524,6 +1523,36 @@ RelationSysNameGetRelation(const char *relationName)
* ----------------------------------------------------------------
*/
/*
* RelationIncrementReferenceCount
* Increments relation reference count.
*
* Note: bootstrap mode has its own weird ideas about relation refcount
* behavior; we ought to fix it someday, but for now, just disable
* reference count ownership tracking in bootstrap mode.
*/
void
RelationIncrementReferenceCount(Relation rel)
{
ResourceOwnerEnlargeRelationRefs(CurrentResourceOwner);
rel->rd_refcnt += 1;
if (!IsBootstrapProcessingMode())
ResourceOwnerRememberRelationRef(CurrentResourceOwner, rel);
}
/*
* RelationDecrementReferenceCount
* Decrements relation reference count.
*/
void
RelationDecrementReferenceCount(Relation rel)
{
Assert(rel->rd_refcnt > 0);
rel->rd_refcnt -= 1;
if (!IsBootstrapProcessingMode())
ResourceOwnerForgetRelationRef(CurrentResourceOwner, rel);
}
/*
* RelationClose - close an open relation
*
@ -1680,8 +1709,6 @@ RelationClearRelation(Relation relation, bool rebuild)
list_free(relation->rd_indexlist);
if (relation->rd_indexcxt)
MemoryContextDelete(relation->rd_indexcxt);
if (relation->rd_prevrefcnt)
pfree(relation->rd_prevrefcnt);
/*
* If we're really done with the relcache entry, blow it away. But if
@ -1704,6 +1731,10 @@ RelationClearRelation(Relation relation, bool rebuild)
* When rebuilding an open relcache entry, must preserve ref count
* and rd_isnew flag. Also attempt to preserve the tupledesc and
* rewrite-rule substructures in place.
*
* Note that this process does not touch CurrentResourceOwner;
* which is good because whatever ref counts the entry may have
* do not necessarily belong to that resource owner.
*/
int old_refcnt = relation->rd_refcnt;
bool old_isnew = relation->rd_isnew;
@ -1726,7 +1757,7 @@ RelationClearRelation(Relation relation, bool rebuild)
elog(ERROR, "relation %u deleted while still in use",
buildinfo.i.info_id);
}
RelationSetReferenceCount(relation, old_refcnt);
relation->rd_refcnt = old_refcnt;
relation->rd_isnew = old_isnew;
if (equalTupleDescs(old_att, relation->rd_att))
{
@ -1964,7 +1995,7 @@ RelationCacheInvalidate(void)
/*
* AtEOXact_RelationCache
*
* Clean up the relcache at transaction commit or abort.
* Clean up the relcache at main-transaction commit or abort.
*
* Note: this must be called *before* processing invalidation messages.
* In the case of abort, we don't want to try to rebuild any invalidated
@ -2031,21 +2062,15 @@ AtEOXact_RelationCache(bool isCommit)
elog(WARNING, "relcache reference leak: relation \"%s\" has refcnt %d instead of %d",
RelationGetRelationName(relation),
relation->rd_refcnt, expected_refcnt);
RelationSetReferenceCount(relation, expected_refcnt);
relation->rd_refcnt = expected_refcnt;
}
}
else
{
/* abort case, just reset it quietly */
RelationSetReferenceCount(relation, expected_refcnt);
relation->rd_refcnt = expected_refcnt;
}
/*
* Reset the refcount stack. Just drop the item count; don't deallocate
* the stack itself so it can be reused by future subtransactions.
*/
relation->rd_numpushed = 0;
/*
* Flush any temporary index list.
*/
@ -2058,131 +2083,6 @@ AtEOXact_RelationCache(bool isCommit)
}
}
/*
* RelationPushReferenceCount
*
* Push the current reference count into the stack. Don't modify the
* reference count itself.
*/
static inline void
RelationPushReferenceCount(Relation rel)
{
/* Enlarge the stack if we run out of space. */
if (rel->rd_numpushed == rel->rd_numalloc)
{
MemoryContext old_cxt = MemoryContextSwitchTo(CacheMemoryContext);
if (rel->rd_numalloc == 0)
{
rel->rd_numalloc = 8;
rel->rd_prevrefcnt = palloc(rel->rd_numalloc * sizeof(int));
}
else
{
rel->rd_numalloc *= 2;
rel->rd_prevrefcnt = repalloc(rel->rd_prevrefcnt, rel->rd_numalloc * sizeof(int));
}
MemoryContextSwitchTo(old_cxt);
}
rel->rd_prevrefcnt[rel->rd_numpushed++] = rel->rd_refcnt;
}
/*
* RelationPopReferenceCount
*
* Pop the latest stored reference count. If there is none, drop it
* to zero; the entry was created in the current subtransaction.
*/
static inline void
RelationPopReferenceCount(Relation rel)
{
if (rel->rd_numpushed == 0)
{
rel->rd_refcnt = rel->rd_isnailed ? 1 : 0;
return;
}
rel->rd_refcnt = rel->rd_prevrefcnt[--rel->rd_numpushed];
}
/*
* AtEOSubXact_RelationCache
*/
void
AtEOSubXact_RelationCache(bool isCommit)
{
HASH_SEQ_STATUS status;
RelIdCacheEnt *idhentry;
/* We'd better not be bootstrapping. */
Assert(!IsBootstrapProcessingMode());
hash_seq_init(&status, RelationIdCache);
while ((idhentry = (RelIdCacheEnt *) hash_seq_search(&status)) != NULL)
{
Relation relation = idhentry->reldesc;
/*
* During subtransaction commit, we first check whether the
* current refcount is correct: if there is no item in the stack,
* the relcache entry was created during this subtransaction, it should
* be 0 (or 1 for nailed relations). If the stack has at least one
* item, the expected count is whatever that item is.
*/
if (isCommit)
{
int expected_refcnt;
if (relation->rd_numpushed == 0)
expected_refcnt = relation->rd_isnailed ? 1 : 0;
else
expected_refcnt = relation->rd_prevrefcnt[relation->rd_numpushed - 1];
if (relation->rd_refcnt != expected_refcnt)
{
elog(WARNING, "relcache reference leak: relation \"%s\" has refcnt %d instead of %d",
RelationGetRelationName(relation),
relation->rd_refcnt, expected_refcnt);
}
}
/*
* On commit, the expected count is stored so there's no harm in
* popping it (and we may need to fix if there was a leak); and during
* abort, the correct refcount has to be restored.
*/
RelationPopReferenceCount(relation);
}
}
/*
* AtSubStart_RelationCache
*
* At subtransaction start, we push the current reference count into
* the refcount stack, so it can be restored if the subtransaction aborts.
*/
void
AtSubStart_RelationCache(void)
{
HASH_SEQ_STATUS status;
RelIdCacheEnt *idhentry;
/* We'd better not be bootstrapping. */
Assert(!IsBootstrapProcessingMode());
hash_seq_init(&status, RelationIdCache);
while ((idhentry = (RelIdCacheEnt *) hash_seq_search(&status)) != NULL)
{
Relation relation = idhentry->reldesc;
RelationPushReferenceCount(relation);
}
}
/*
* RelationBuildLocalRelation
* Build a relcache entry for an about-to-be-created relation,
@ -2223,7 +2123,7 @@ RelationBuildLocalRelation(const char *relname,
/* make sure relation is marked as having no open file yet */
rel->rd_smgr = NULL;
RelationSetReferenceCount(rel, 1);
rel->rd_refcnt = nailit ? 1 : 0;
/* it's being created in this transaction */
rel->rd_isnew = true;
@ -2305,6 +2205,11 @@ RelationBuildLocalRelation(const char *relname,
*/
MemoryContextSwitchTo(oldcxt);
/*
* Caller expects us to pin the returned entry.
*/
RelationIncrementReferenceCount(rel);
return rel;
}
@ -2422,7 +2327,7 @@ RelationCacheInitializePhase2(void)
buildinfo.i.info_name = (indname); \
ird = RelationBuildDesc(buildinfo, NULL); \
ird->rd_isnailed = 1; \
RelationSetReferenceCount(ird, 1); \
ird->rd_refcnt = 1; \
} while (0)
LOAD_CRIT_INDEX(ClassNameNspIndex);
@ -3201,9 +3106,9 @@ load_relcache_init_file(void)
rel->rd_smgr = NULL;
rel->rd_targblock = InvalidBlockNumber;
if (rel->rd_isnailed)
RelationSetReferenceCount(rel, 1);
rel->rd_refcnt = 1;
else
RelationSetReferenceCount(rel, 0);
rel->rd_refcnt = 0;
rel->rd_indexvalid = 0;
rel->rd_indexlist = NIL;
MemSet(&rel->pgstat_info, 0, sizeof(rel->pgstat_info));

191
src/backend/utils/mmgr/portalmem.c
View File

@ -12,7 +12,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/mmgr/portalmem.c,v 1.66 2004/07/01 00:51:29 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/mmgr/portalmem.c,v 1.67 2004/07/17 03:29:46 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -186,6 +186,10 @@ CreatePortal(const char *name, bool allowDup, bool dupSilent)
ALLOCSET_SMALL_INITSIZE,
ALLOCSET_SMALL_MAXSIZE);
/* create a resource owner for the portal */
portal->resowner = ResourceOwnerCreate(CurTransactionResourceOwner,
"Portal");
/* initialize portal fields that don't start off zero */
portal->cleanup = PortalCleanup;
portal->createXact = GetCurrentTransactionId();
@ -291,17 +295,14 @@ PortalCreateHoldStore(Portal portal)
/*
* PortalDrop
* Destroy the portal.
*
* isError: if true, we are destroying portals at the end of a failed
* transaction. (This causes PortalCleanup to skip unneeded steps.)
*/
void
PortalDrop(Portal portal, bool isError)
PortalDrop(Portal portal, bool isTopCommit)
{
AssertArg(PortalIsValid(portal));
/* Not sure if this case can validly happen or not... */
if (portal->portalActive)
if (portal->status == PORTAL_ACTIVE)
elog(ERROR, "cannot drop active portal");
/*
@ -314,7 +315,49 @@ PortalDrop(Portal portal, bool isError)
/* let portalcmds.c clean up the state it knows about */
if (PointerIsValid(portal->cleanup))
(*portal->cleanup) (portal, isError);
(*portal->cleanup) (portal);
/*
* Release any resources still attached to the portal. There are
* several cases being covered here:
*
* Top transaction commit (indicated by isTopCommit): normally we should
* do nothing here and let the regular end-of-transaction resource
* releasing mechanism handle these resources too. However, if we have
* a FAILED portal (eg, a cursor that got an error), we'd better clean
* up its resources to avoid resource-leakage warning messages.
*
* Sub transaction commit: never comes here at all, since we don't
* kill any portals in AtSubCommit_Portals().
*
* Main or sub transaction abort: we will do nothing here because
* portal->resowner was already set NULL; the resources were already
* cleaned up in transaction abort.
*
* Ordinary portal drop: must release resources. However, if the portal
* is not FAILED then we do not release its locks. The locks become
* the responsibility of the transaction's ResourceOwner (since it is
* the parent of the portal's owner) and will be released when the
* transaction eventually ends.
*/
if (portal->resowner &&
(!isTopCommit || portal->status == PORTAL_FAILED))
{
bool isCommit = (portal->status != PORTAL_FAILED);
ResourceOwnerRelease(portal->resowner,
RESOURCE_RELEASE_BEFORE_LOCKS,
isCommit, false);
ResourceOwnerRelease(portal->resowner,
RESOURCE_RELEASE_LOCKS,
isCommit, false);
ResourceOwnerRelease(portal->resowner,
RESOURCE_RELEASE_AFTER_LOCKS,
isCommit, false);
if (!isCommit)
ResourceOwnerDelete(portal->resowner);
}
portal->resowner = NULL;
/*
* Delete tuplestore if present. We should do this even under error
@ -396,19 +439,29 @@ AtCommit_Portals(void)
/*
* Do not touch active portals --- this can only happen in the
* case of a multi-transaction utility command, such as VACUUM.
*
* Note however that any resource owner attached to such a portal
* is still going to go away, so don't leave a dangling pointer.
*/
if (portal->portalActive)
if (portal->status == PORTAL_ACTIVE)
{
portal->resowner = NULL;
continue;
}
/*
* Do nothing else to cursors held over from a previous
* transaction. (This test must include checking CURSOR_OPT_HOLD,
* else we will fail to clean up a VACUUM portal if it fails after
* its first sub-transaction.)
*/
if (portal->createXact != xact &&
(portal->cursorOptions & CURSOR_OPT_HOLD))
continue;
if (portal->cursorOptions & CURSOR_OPT_HOLD)
if ((portal->cursorOptions & CURSOR_OPT_HOLD) &&
portal->status == PORTAL_READY)
{
/*
* Do nothing to cursors held over from a previous
* transaction.
*/
if (portal->createXact != xact)
continue;
/*
* We are exiting the transaction that created a holdable
* cursor. Instead of dropping the portal, prepare it for
@ -420,11 +473,18 @@ AtCommit_Portals(void)
*/
PortalCreateHoldStore(portal);
PersistHoldablePortal(portal);
/*
* Any resources belonging to the portal will be released in the
* upcoming transaction-wide cleanup; the portal will no
* longer have its own resources.
*/
portal->resowner = NULL;
}
else
{
/* Zap all non-holdable portals */
PortalDrop(portal, false);
PortalDrop(portal, true);
}
}
}
@ -432,13 +492,11 @@ AtCommit_Portals(void)
/*
* Abort processing for portals.
*
* At this point we reset the "active" flags and run the cleanup hook if
* At this point we reset "active" status and run the cleanup hook if
* present, but we can't release memory until the cleanup call.
*
* The reason we need to reset active is so that we can replace the unnamed
* portal, else we'll fail to execute ROLLBACK when it arrives. Also, we
* want to run the cleanup hook now to be certain it knows that we had an
* error abort and not successful conclusion.
* portal, else we'll fail to execute ROLLBACK when it arrives.
*/
void
AtAbort_Portals(void)
@ -453,7 +511,8 @@ AtAbort_Portals(void)
{
Portal portal = hentry->portal;
portal->portalActive = false;
if (portal->status == PORTAL_ACTIVE)
portal->status = PORTAL_FAILED;
/*
* Do nothing else to cursors held over from a previous
@ -468,17 +527,22 @@ AtAbort_Portals(void)
/* let portalcmds.c clean up the state it knows about */
if (PointerIsValid(portal->cleanup))
{
(*portal->cleanup) (portal, true);
(*portal->cleanup) (portal);
portal->cleanup = NULL;
}
/*
* Any resources belonging to the portal will be released in the
* upcoming transaction-wide cleanup; they will be gone before
* we run PortalDrop.
*/
portal->resowner = NULL;
}
}
/*
* Post-abort cleanup for portals.
*
* Delete all portals not held over from prior transactions.
*/
* Delete all portals not held over from prior transactions. */
void
AtCleanup_Portals(void)
{
@ -492,10 +556,9 @@ AtCleanup_Portals(void)
{
Portal portal = hentry->portal;
/*
* Let's just make sure no one's active...
*/
portal->portalActive = false;
/* AtAbort_Portals should have fixed these: */
Assert(portal->status != PORTAL_ACTIVE);
Assert(portal->resowner == NULL);
/*
* Do nothing else to cursors held over from a previous
@ -507,8 +570,8 @@ AtCleanup_Portals(void)
(portal->cursorOptions & CURSOR_OPT_HOLD))
continue;
/* Else zap it with prejudice. */
PortalDrop(portal, true);
/* Else zap it. */
PortalDrop(portal, false);
}
}
@ -516,11 +579,11 @@ AtCleanup_Portals(void)
* Pre-subcommit processing for portals.
*
* Reassign the portals created in the current subtransaction to the parent
* transaction. (XXX perhaps we should reassign only holdable cursors,
* and drop the rest?)
* transaction.
*/
void
AtSubCommit_Portals(TransactionId parentXid)
AtSubCommit_Portals(TransactionId parentXid,
ResourceOwner parentXactOwner)
{
HASH_SEQ_STATUS status;
PortalHashEnt *hentry;
@ -533,19 +596,24 @@ AtSubCommit_Portals(TransactionId parentXid)
Portal portal = hentry->portal;
if (portal->createXact == curXid)
{
portal->createXact = parentXid;
if (portal->resowner)
ResourceOwnerNewParent(portal->resowner, parentXactOwner);
}
}
}
/*
* Subtransaction abort handling for portals.
*
* Deactivate all portals created during the failed subtransaction.
* Deactivate failed portals created during the failed subtransaction.
* Note that per AtSubCommit_Portals, this will catch portals created
* in descendants of the subtransaction too.
*/
void
AtSubAbort_Portals(void)
AtSubAbort_Portals(TransactionId parentXid,
ResourceOwner parentXactOwner)
{
HASH_SEQ_STATUS status;
PortalHashEnt *hentry;
@ -560,13 +628,39 @@ AtSubAbort_Portals(void)
if (portal->createXact != curXid)
continue;
portal->portalActive = false;
/*
* Force any active portals of my own transaction into FAILED state.
* This is mostly to ensure that a portal running a FETCH will go
* FAILED if the underlying cursor fails. (Note we do NOT want to
* do this to upper-level portals, since they may be able to continue.)
*/
if (portal->status == PORTAL_ACTIVE)
portal->status = PORTAL_FAILED;
/* let portalcmds.c clean up the state it knows about */
if (PointerIsValid(portal->cleanup))
/*
* If the portal is READY then allow it to survive into the
* parent transaction; otherwise shut it down.
*/
if (portal->status == PORTAL_READY)
{
(*portal->cleanup) (portal, true);
portal->cleanup = NULL;
portal->createXact = parentXid;
if (portal->resowner)
ResourceOwnerNewParent(portal->resowner, parentXactOwner);
}
else
{
/* let portalcmds.c clean up the state it knows about */
if (PointerIsValid(portal->cleanup))
{
(*portal->cleanup) (portal);
portal->cleanup = NULL;
}
/*
* Any resources belonging to the portal will be released in the
* upcoming transaction-wide cleanup; they will be gone before
* we run PortalDrop.
*/
portal->resowner = NULL;
}
}
}
@ -574,8 +668,8 @@ AtSubAbort_Portals(void)
/*
* Post-subabort cleanup for portals.
*
* Drop all portals created in the finishing subtransaction and all
* its descendants.
* Drop all portals created in the failed subtransaction (but note that
* we will not drop any that were reassigned to the parent above).
*/
void
AtSubCleanup_Portals(void)
@ -593,12 +687,11 @@ AtSubCleanup_Portals(void)
if (portal->createXact != curXid)
continue;
/*
* Let's just make sure no one's active...
*/
portal->portalActive = false;
/* AtSubAbort_Portals should have fixed these: */
Assert(portal->status != PORTAL_ACTIVE);
Assert(portal->resowner == NULL);
/* Zap it with prejudice. */
PortalDrop(portal, true);
/* Zap it. */
PortalDrop(portal, false);
}
}

30
src/backend/utils/resowner/Makefile Normal file
View File

@ -0,0 +1,30 @@
#-------------------------------------------------------------------------
#
# Makefile--
# Makefile for utils/resowner
#
# IDENTIFICATION
# $PostgreSQL: pgsql/src/backend/utils/resowner/Makefile,v 1.1 2004/07/17 03:30:10 tgl Exp $
#
#-------------------------------------------------------------------------
subdir = src/backend/utils/resowner
top_builddir = ../../../..
include $(top_builddir)/src/Makefile.global
OBJS = resowner.o
all: SUBSYS.o
SUBSYS.o: $(OBJS)
$(LD) $(LDREL) $(LDOUT) SUBSYS.o $(OBJS)
depend dep:
$(CC) -MM $(CFLAGS) *.c >depend
clean:
rm -f SUBSYS.o $(OBJS)
ifeq (depend,$(wildcard depend))
include depend
endif

74
src/backend/utils/resowner/README Normal file
View File

@ -0,0 +1,74 @@
$PostgreSQL: pgsql/src/backend/utils/resowner/README,v 1.1 2004/07/17 03:30:10 tgl Exp $
Notes about resource owners
---------------------------
ResourceOwner objects are a concept invented to simplify management of
query-related resources, such as buffer pins and table locks. These
resources need to be tracked in a reliable way to ensure that they will
be released at query end, even if the query fails due to an error.
Rather than expecting the entire executor to have bulletproof data
structures, we localize the tracking of such resources into a single
module.
The design of the ResourceOwner API is modeled on our MemoryContext API,
which has proven very flexible and successful in preventing memory leaks.
In particular we allow ResourceOwners to have child ResourceOwner objects
so that there can be forests of the things; releasing a parent
ResourceOwner acts on all its direct and indirect children as well.
(It is tempting to consider unifying ResourceOwners and MemoryContexts
into a single object type, but their usage patterns are sufficiently
different that this is probably not really a helpful thing to do.)
We create a ResourceOwner for each transaction or subtransaction as
well as one for each Portal. During execution of a Portal, the global
variable CurrentResourceOwner points to the Portal's ResourceOwner.
This causes operations such as ReadBuffer and LockAcquire to record
ownership of the acquired resources in that ResourceOwner object.
When a Portal is closed, any remaining resources (typically only locks)
become the responsibility of the current transaction. This is represented
by making the Portal's ResourceOwner a child of the current transaction's
ResourceOwner. Similarly, subtransaction ResourceOwners are children of
their immediate parent.
We need transaction-related ResourceOwners as well as Portal-related ones
because transactions may initiate operations that require resources (such
as query parsing) when no associated Portal exists yet.
API overview
------------
The basic operations on a ResourceOwner are:
* create a ResourceOwner
* associate or deassociate some resource with a ResourceOwner
* release a ResourceOwner's assets (free all owned resources, but not the
owner object itself)
* delete a ResourceOwner (including child owner objects); all resources
must have been released beforehand
Currently, ResourceOwners contain direct support for recording ownership
of buffer pins, lmgr locks, and catcache and relcache references. Other
objects can be associated with a ResourceOwner by recording the address of
the owning ResourceOwner in such an object. There is an API for other
modules to get control during ResourceOwner release, so that they can scan
their own data structures to find the objects that need to be deleted.
Whenever we are inside a transaction, the global variable
CurrentResourceOwner shows which resource owner should be assigned
ownership of acquired resources. Note however that CurrentResourceOwner
is NULL when not inside any transaction (or when inside a failed
transaction). In this case it is not valid to acquire query-lifespan
resources.
When unpinning a buffer or releasing a lock or cache reference,
CurrentResourceOwner must point to the same resource owner that was current
when the buffer, lock, or cache reference was acquired. It would be possible
to relax this restriction given additional bookkeeping effort, but at present
there seems no need.

840
src/backend/utils/resowner/resowner.c Normal file
View File

@ -0,0 +1,840 @@
/*-------------------------------------------------------------------------
*
* resowner.c
* POSTGRES resource owner management code.
*
* Query-lifespan resources are tracked by associating them with
* ResourceOwner objects. This provides a simple mechanism for ensuring
* that such resources are freed at the right time.
* See utils/resowner/README for more info.
*
*
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/resowner/resowner.c,v 1.1 2004/07/17 03:30:10 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "utils/resowner.h"
#include "access/gistscan.h"
#include "access/hash.h"
#include "access/rtree.h"
#include "storage/bufmgr.h"
#include "storage/proc.h"
#include "utils/memutils.h"
#include "utils/relcache.h"
/*
* Info needed to identify/release a lock
*/
typedef struct LockIdData
{
/* we assume lockmethodid is part of locktag */
LOCKTAG locktag;
TransactionId xid;
LOCKMODE lockmode;
} LockIdData;
/*
* ResourceOwner objects look like this
*/
typedef struct ResourceOwnerData
{
ResourceOwner parent; /* NULL if no parent (toplevel owner) */
ResourceOwner firstchild; /* head of linked list of children */
ResourceOwner nextchild; /* next child of same parent */
const char *name; /* name (just for debugging) */
/* We have built-in support for remembering owned buffers */
int nbuffers; /* number of owned buffer pins */
Buffer *buffers; /* dynamically allocated array */
int maxbuffers; /* currently allocated array size */
/* We have built-in support for remembering owned locks */
int nlocks; /* number of owned locks */
LockIdData *locks; /* dynamically allocated array */
int maxlocks; /* currently allocated array size */
/* We have built-in support for remembering catcache references */
int ncatrefs; /* number of owned catcache pins */
HeapTuple *catrefs; /* dynamically allocated array */
int maxcatrefs; /* currently allocated array size */
int ncatlistrefs; /* number of owned catcache-list pins */
CatCList **catlistrefs; /* dynamically allocated array */
int maxcatlistrefs; /* currently allocated array size */
/* We have built-in support for remembering relcache references */
int nrelrefs; /* number of owned relcache pins */
Relation *relrefs; /* dynamically allocated array */
int maxrelrefs; /* currently allocated array size */
} ResourceOwnerData;
/*****************************************************************************
* GLOBAL MEMORY *
*****************************************************************************/
ResourceOwner CurrentResourceOwner = NULL;
ResourceOwner CurTransactionResourceOwner = NULL;
ResourceOwner TopTransactionResourceOwner = NULL;
/*
* List of add-on callbacks for resource releasing
*/
typedef struct ResourceReleaseCallbackItem
{
struct ResourceReleaseCallbackItem *next;
ResourceReleaseCallback callback;
void *arg;
} ResourceReleaseCallbackItem;
static ResourceReleaseCallbackItem *ResourceRelease_callbacks = NULL;
/*****************************************************************************
* EXPORTED ROUTINES *
*****************************************************************************/
/*
* ResourceOwnerCreate
* Create an empty ResourceOwner.
*
* All ResourceOwner objects are kept in TopMemoryContext, since they should
* only be freed explicitly.
*/
ResourceOwner
ResourceOwnerCreate(ResourceOwner parent, const char *name)
{
ResourceOwner owner;
owner = (ResourceOwner) MemoryContextAllocZero(TopMemoryContext,
sizeof(ResourceOwnerData));
owner->name = name;
if (parent)
{
owner->parent = parent;
owner->nextchild = parent->firstchild;
parent->firstchild = owner;
}
return owner;
}
/*
* ResourceOwnerRelease
* Release all resources owned by a ResourceOwner and its descendants,
* but don't delete the owner objects themselves.
*
* Note that this executes just one phase of release, and so typically
* must be called three times. We do it this way because (a) we want to
* do all the recursion separately for each phase, thereby preserving
* the needed order of operations; and (b) xact.c may have other operations
* to do between the phases.
*
* phase: release phase to execute
* isCommit: true for successful completion of a query or transaction,
* false for unsuccessful
* isTopLevel: true if completing a main transaction, else false
*
* isCommit is passed because some modules may expect that their resources
* were all released already if the transaction or portal finished normally.
* If so it is reasonable to give a warning (NOT an error) should any
* unreleased resources be present. When isCommit is false, such warnings
* are generally inappropriate.
*
* isTopLevel is passed when we are releasing TopTransactionResourceOwner
* at completion of a main transaction. This generally means that *all*
* resources will be released, and so we can optimize things a bit.
*/
void
ResourceOwnerRelease(ResourceOwner owner,
ResourceReleasePhase phase,
bool isCommit,
bool isTopLevel)
{
ResourceOwner child;
ResourceOwner save;
ResourceReleaseCallbackItem *item;
/* Recurse to handle descendants */
for (child = owner->firstchild; child != NULL; child = child->nextchild)
ResourceOwnerRelease(child, phase, isCommit, isTopLevel);
/*
* Make CurrentResourceOwner point to me, so that ReleaseBuffer etc
* don't get confused.
*/
save = CurrentResourceOwner;
CurrentResourceOwner = owner;
if (phase == RESOURCE_RELEASE_BEFORE_LOCKS)
{
/* Release buffer pins */
if (isTopLevel)
{
/*
* For a top-level xact we are going to release all buffers,
* so just do a single bufmgr call at the top of the recursion.
*/
if (owner == TopTransactionResourceOwner)
AtEOXact_Buffers(isCommit);
/* Mark object as owning no buffers, just for sanity */
owner->nbuffers = 0;
}
else
{
/*
* Release buffers retail. Note that ReleaseBuffer will remove
* the buffer entry from my list, so I just have to iterate till
* there are none.
*
* XXX this is fairly inefficient due to multiple BufMgrLock grabs
* if there are lots of buffers to be released, but we don't
* expect many (indeed none in the success case) so it's probably
* not worth optimizing.
*
* We are however careful to release back-to-front, so as to
* avoid O(N^2) behavior in ResourceOwnerForgetBuffer().
*/
while (owner->nbuffers > 0)
ReleaseBuffer(owner->buffers[owner->nbuffers - 1]);
}
/* Release relcache references */
if (isTopLevel)
{
/*
* For a top-level xact we are going to release all references,
* so just do a single relcache call at the top of the recursion.
*/
if (owner == TopTransactionResourceOwner)
AtEOXact_RelationCache(isCommit);
/* Mark object as owning no relrefs, just for sanity */
owner->nrelrefs = 0;
}
else
{
/*
* Release relcache refs retail. Note that RelationClose will
* remove the relref entry from my list, so I just have to iterate
* till there are none.
*/
while (owner->nrelrefs > 0)
RelationClose(owner->relrefs[owner->nrelrefs - 1]);
}
}
else if (phase == RESOURCE_RELEASE_LOCKS)
{
if (isTopLevel)
{
/*
* For a top-level xact we are going to release all locks (or at
* least all non-session locks), so just do a single lmgr call
* at the top of the recursion.
*/
if (owner == TopTransactionResourceOwner)
ProcReleaseLocks(isCommit);
/* Mark object as holding no locks, just for sanity */
owner->nlocks = 0;
}
else if (!isCommit)
{
/*
* Release locks retail. Note that LockRelease will remove
* the lock entry from my list, so I just have to iterate till
* there are none. Also note that if we are committing a
* subtransaction, we do NOT release its locks yet.
*
* XXX as above, this is a bit inefficient but probably not worth
* the trouble to optimize more.
*/
while (owner->nlocks > 0)
{
LockIdData *lockid = &owner->locks[owner->nlocks - 1];
LockRelease(lockid->locktag.lockmethodid,
&lockid->locktag,
lockid->xid,
lockid->lockmode);
}
}
}
else if (phase == RESOURCE_RELEASE_AFTER_LOCKS)
{
/* Release catcache references */
if (isTopLevel)
{
/*
* For a top-level xact we are going to release all references,
* so just do a single catcache call at the top of the recursion.
*/
if (owner == TopTransactionResourceOwner)
AtEOXact_CatCache(isCommit);
/* Mark object as owning no catrefs, just for sanity */
owner->ncatrefs = 0;
owner->ncatlistrefs = 0;
}
else
{
/*
* Release catcache refs retail. Note that ReleaseCatCache will
* remove the catref entry from my list, so I just have to iterate
* till there are none. Ditto for catcache lists.
*/
while (owner->ncatrefs > 0)
ReleaseCatCache(owner->catrefs[owner->ncatrefs - 1]);
while (owner->ncatlistrefs > 0)
ReleaseCatCacheList(owner->catlistrefs[owner->ncatlistrefs - 1]);
}
/* Clean up index scans too */
ReleaseResources_gist();
ReleaseResources_hash();
ReleaseResources_rtree();
}
/* Let add-on modules get a chance too */
for (item = ResourceRelease_callbacks; item; item = item->next)
(*item->callback) (phase, isCommit, isTopLevel, item->arg);
CurrentResourceOwner = save;
}
/*
* ResourceOwnerDelete
* Delete an owner object and its descendants.
*
* The caller must have already released all resources in the object tree.
*/
void
ResourceOwnerDelete(ResourceOwner owner)
{
/* We had better not be deleting CurrentResourceOwner ... */
Assert(owner != CurrentResourceOwner);
/* And it better not own any resources, either */
Assert(owner->nbuffers == 0);
Assert(owner->nlocks == 0);
Assert(owner->ncatrefs == 0);
Assert(owner->ncatlistrefs == 0);
Assert(owner->nrelrefs == 0);
/*
* Delete children. The recursive call will delink the child
* from me, so just iterate as long as there is a child.
*/
while (owner->firstchild != NULL)
ResourceOwnerDelete(owner->firstchild);
/*
* We delink the owner from its parent before deleting it, so that
* if there's an error we won't have deleted/busted owners still
* attached to the owner tree. Better a leak than a crash.
*/
ResourceOwnerNewParent(owner, NULL);
/* And free the object. */
if (owner->buffers)
pfree(owner->buffers);
if (owner->locks)
pfree(owner->locks);
if (owner->catrefs)
pfree(owner->catrefs);
if (owner->catlistrefs)
pfree(owner->catlistrefs);
if (owner->relrefs)
pfree(owner->relrefs);
pfree(owner);
}
/*
* Reassign a ResourceOwner to have a new parent
*/
void
ResourceOwnerNewParent(ResourceOwner owner,
ResourceOwner newparent)
{
ResourceOwner oldparent = owner->parent;
if (oldparent)
{
if (owner == oldparent->firstchild)
oldparent->firstchild = owner->nextchild;
else
{
ResourceOwner child;
for (child = oldparent->firstchild; child; child = child->nextchild)
{
if (owner == child->nextchild)
{
child->nextchild = owner->nextchild;
break;
}
}
}
}
if (newparent)
{
Assert(owner != newparent);
owner->parent = newparent;
owner->nextchild = newparent->firstchild;
newparent->firstchild = owner;
}
else
{
owner->parent = NULL;
owner->nextchild = NULL;
}
}
/*
* Register or deregister callback functions for resource cleanup
*
* These functions are intended for use by dynamically loaded modules.
* For built-in modules we generally just hardwire the appropriate calls.
*
* Note that the callback occurs post-commit or post-abort, so the callback
* functions can only do noncritical cleanup.
*/
void
RegisterResourceReleaseCallback(ResourceReleaseCallback callback, void *arg)
{
ResourceReleaseCallbackItem *item;
item = (ResourceReleaseCallbackItem *)
MemoryContextAlloc(TopMemoryContext,
sizeof(ResourceReleaseCallbackItem));
item->callback = callback;
item->arg = arg;
item->next = ResourceRelease_callbacks;
ResourceRelease_callbacks = item;
}
void
UnregisterResourceReleaseCallback(ResourceReleaseCallback callback, void *arg)
{
ResourceReleaseCallbackItem *item;
ResourceReleaseCallbackItem *prev;
prev = NULL;
for (item = ResourceRelease_callbacks; item; prev = item, item = item->next)
{
if (item->callback == callback && item->arg == arg)
{
if (prev)
prev->next = item->next;
else
ResourceRelease_callbacks = item->next;
pfree(item);
break;
}
}
}
/*
* Make sure there is room for at least one more entry in a ResourceOwner's
* buffer array.
*
* This is separate from actually inserting an entry because if we run out
* of memory, it's critical to do so *before* acquiring the resource.
*
* We allow the case owner == NULL because the bufmgr is sometimes invoked
* outside any transaction (for example, in the bgwriter).
*/
void
ResourceOwnerEnlargeBuffers(ResourceOwner owner)
{
int newmax;
if (owner == NULL ||
owner->nbuffers < owner->maxbuffers)
return; /* nothing to do */
if (owner->buffers == NULL)
{
newmax = 16;
owner->buffers = (Buffer *)
MemoryContextAlloc(TopMemoryContext, newmax * sizeof(Buffer));
owner->maxbuffers = newmax;
}
else
{
newmax = owner->maxbuffers * 2;
owner->buffers = (Buffer *)
repalloc(owner->buffers, newmax * sizeof(Buffer));
owner->maxbuffers = newmax;
}
}
/*
* Remember that a buffer pin is owned by a ResourceOwner
*
* Caller must have previously done ResourceOwnerEnlargeBuffers()
*
* We allow the case owner == NULL because the bufmgr is sometimes invoked
* outside any transaction (for example, in the bgwriter).
*/
void
ResourceOwnerRememberBuffer(ResourceOwner owner, Buffer buffer)
{
if (owner != NULL)
{
Assert(owner->nbuffers < owner->maxbuffers);
owner->buffers[owner->nbuffers] = buffer;
owner->nbuffers++;
}
}
/*
* Forget that a buffer pin is owned by a ResourceOwner
*
* We allow the case owner == NULL because the bufmgr is sometimes invoked
* outside any transaction (for example, in the bgwriter).
*/
void
ResourceOwnerForgetBuffer(ResourceOwner owner, Buffer buffer)
{
if (owner != NULL)
{
Buffer *buffers = owner->buffers;
int nb1 = owner->nbuffers - 1;
int i;
/*
* Scan back-to-front because it's more likely we are releasing
* a recently pinned buffer. This isn't always the case of course,
* but it's the way to bet.
*/
for (i = nb1; i >= 0; i--)
{
if (buffers[i] == buffer)
{
while (i < nb1)
{
buffers[i] = buffers[i + 1];
i++;
}
owner->nbuffers = nb1;
return;
}
}
elog(ERROR, "buffer %d is not owned by resource owner %s",
buffer, owner->name);
}
}
/*
* Make sure there is room for at least one more entry in a ResourceOwner's
* lock array.
*
* This is separate from actually inserting an entry because if we run out
* of memory, it's critical to do so *before* acquiring the resource.
*/
void
ResourceOwnerEnlargeLocks(ResourceOwner owner)
{
int newmax;
if (owner->nlocks < owner->maxlocks)
return; /* nothing to do */
if (owner->locks == NULL)
{
newmax = 16;
owner->locks = (LockIdData *)
MemoryContextAlloc(TopMemoryContext, newmax * sizeof(LockIdData));
owner->maxlocks = newmax;
}
else
{
newmax = owner->maxlocks * 2;
owner->locks = (LockIdData *)
repalloc(owner->locks, newmax * sizeof(LockIdData));
owner->maxlocks = newmax;
}
}
/*
* Remember that a lock is owned by a ResourceOwner
*
* Caller must have previously done ResourceOwnerEnlargeLocks()
*/
void
ResourceOwnerRememberLock(ResourceOwner owner,
LOCKTAG *locktag,
TransactionId xid,
LOCKMODE lockmode)
{
/* Session locks and user locks are not transactional */
if (xid != InvalidTransactionId &&
locktag->lockmethodid == DEFAULT_LOCKMETHOD)
{
Assert(owner->nlocks < owner->maxlocks);
owner->locks[owner->nlocks].locktag = *locktag;
owner->locks[owner->nlocks].xid = xid;
owner->locks[owner->nlocks].lockmode = lockmode;
owner->nlocks++;
}
}
/*
* Forget that a lock is owned by a ResourceOwner
*/
void
ResourceOwnerForgetLock(ResourceOwner owner,
LOCKTAG *locktag,
TransactionId xid,
LOCKMODE lockmode)
{
/* Session locks and user locks are not transactional */
if (xid != InvalidTransactionId &&
locktag->lockmethodid == DEFAULT_LOCKMETHOD)
{
LockIdData *locks = owner->locks;
int nl1 = owner->nlocks - 1;
int i;
for (i = nl1; i >= 0; i--)
{
if (memcmp(&locks[i].locktag, locktag, sizeof(LOCKTAG)) == 0 &&
locks[i].xid == xid &&
locks[i].lockmode == lockmode)
{
while (i < nl1)
{
locks[i] = locks[i + 1];
i++;
}
owner->nlocks = nl1;
return;
}
}
elog(ERROR, "lock %u/%u/%u is not owned by resource owner %s",
locktag->relId, locktag->dbId, locktag->objId.xid, owner->name);
}
}
/*
* Make sure there is room for at least one more entry in a ResourceOwner's
* catcache reference array.
*
* This is separate from actually inserting an entry because if we run out
* of memory, it's critical to do so *before* acquiring the resource.
*/
void
ResourceOwnerEnlargeCatCacheRefs(ResourceOwner owner)
{
int newmax;
if (owner->ncatrefs < owner->maxcatrefs)
return; /* nothing to do */
if (owner->catrefs == NULL)
{
newmax = 16;
owner->catrefs = (HeapTuple *)
MemoryContextAlloc(TopMemoryContext, newmax * sizeof(HeapTuple));
owner->maxcatrefs = newmax;
}
else
{
newmax = owner->maxcatrefs * 2;
owner->catrefs = (HeapTuple *)
repalloc(owner->catrefs, newmax * sizeof(HeapTuple));
owner->maxcatrefs = newmax;
}
}
/*
* Remember that a catcache reference is owned by a ResourceOwner
*
* Caller must have previously done ResourceOwnerEnlargeCatCacheRefs()
*/
void
ResourceOwnerRememberCatCacheRef(ResourceOwner owner, HeapTuple tuple)
{
Assert(owner->ncatrefs < owner->maxcatrefs);
owner->catrefs[owner->ncatrefs] = tuple;
owner->ncatrefs++;
}
/*
* Forget that a catcache reference is owned by a ResourceOwner
*/
void
ResourceOwnerForgetCatCacheRef(ResourceOwner owner, HeapTuple tuple)
{
HeapTuple *catrefs = owner->catrefs;
int nc1 = owner->ncatrefs - 1;
int i;
for (i = nc1; i >= 0; i--)
{
if (catrefs[i] == tuple)
{
while (i < nc1)
{
catrefs[i] = catrefs[i + 1];
i++;
}
owner->ncatrefs = nc1;
return;
}
}
elog(ERROR, "catcache reference %p is not owned by resource owner %s",
tuple, owner->name);
}
/*
* Make sure there is room for at least one more entry in a ResourceOwner's
* catcache-list reference array.
*
* This is separate from actually inserting an entry because if we run out
* of memory, it's critical to do so *before* acquiring the resource.
*/
void
ResourceOwnerEnlargeCatCacheListRefs(ResourceOwner owner)
{
int newmax;
if (owner->ncatlistrefs < owner->maxcatlistrefs)
return; /* nothing to do */
if (owner->catlistrefs == NULL)
{
newmax = 16;
owner->catlistrefs = (CatCList **)
MemoryContextAlloc(TopMemoryContext, newmax * sizeof(CatCList *));
owner->maxcatlistrefs = newmax;
}
else
{
newmax = owner->maxcatlistrefs * 2;
owner->catlistrefs = (CatCList **)
repalloc(owner->catlistrefs, newmax * sizeof(CatCList *));
owner->maxcatlistrefs = newmax;
}
}
/*
* Remember that a catcache-list reference is owned by a ResourceOwner
*
* Caller must have previously done ResourceOwnerEnlargeCatCacheListRefs()
*/
void
ResourceOwnerRememberCatCacheListRef(ResourceOwner owner, CatCList *list)
{
Assert(owner->ncatlistrefs < owner->maxcatlistrefs);
owner->catlistrefs[owner->ncatlistrefs] = list;
owner->ncatlistrefs++;
}
/*
* Forget that a catcache-list reference is owned by a ResourceOwner
*/
void
ResourceOwnerForgetCatCacheListRef(ResourceOwner owner, CatCList *list)
{
CatCList **catlistrefs = owner->catlistrefs;
int nc1 = owner->ncatlistrefs - 1;
int i;
for (i = nc1; i >= 0; i--)
{
if (catlistrefs[i] == list)
{
while (i < nc1)
{
catlistrefs[i] = catlistrefs[i + 1];
i++;
}
owner->ncatlistrefs = nc1;
return;
}
}
elog(ERROR, "catcache list reference %p is not owned by resource owner %s",
list, owner->name);
}
/*
* Make sure there is room for at least one more entry in a ResourceOwner's
* relcache reference array.
*
* This is separate from actually inserting an entry because if we run out
* of memory, it's critical to do so *before* acquiring the resource.
*/
void
ResourceOwnerEnlargeRelationRefs(ResourceOwner owner)
{
int newmax;
if (owner->nrelrefs < owner->maxrelrefs)
return; /* nothing to do */
if (owner->relrefs == NULL)
{
newmax = 16;
owner->relrefs = (Relation *)
MemoryContextAlloc(TopMemoryContext, newmax * sizeof(Relation));
owner->maxrelrefs = newmax;
}
else
{
newmax = owner->maxrelrefs * 2;
owner->relrefs = (Relation *)
repalloc(owner->relrefs, newmax * sizeof(Relation));
owner->maxrelrefs = newmax;
}
}
/*
* Remember that a relcache reference is owned by a ResourceOwner
*
* Caller must have previously done ResourceOwnerEnlargeRelationRefs()
*/
void
ResourceOwnerRememberRelationRef(ResourceOwner owner, Relation rel)
{
Assert(owner->nrelrefs < owner->maxrelrefs);
owner->relrefs[owner->nrelrefs] = rel;
owner->nrelrefs++;
}
/*
* Forget that a relcache reference is owned by a ResourceOwner
*/
void
ResourceOwnerForgetRelationRef(ResourceOwner owner, Relation rel)
{
Relation *relrefs = owner->relrefs;
int nr1 = owner->nrelrefs - 1;
int i;
for (i = nr1; i >= 0; i--)
{
if (relrefs[i] == rel)
{
while (i < nr1)
{
relrefs[i] = relrefs[i + 1];
i++;
}
owner->nrelrefs = nr1;
return;
}
}
elog(ERROR, "relcache reference %s is not owned by resource owner %s",
RelationGetRelationName(rel), owner->name);
}

5
src/include/access/gistscan.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/gistscan.h,v 1.23 2004/07/01 00:51:38 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/gistscan.h,v 1.24 2004/07/17 03:30:38 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -22,7 +22,6 @@ extern Datum gistmarkpos(PG_FUNCTION_ARGS);
extern Datum gistrestrpos(PG_FUNCTION_ARGS);
extern Datum gistendscan(PG_FUNCTION_ARGS);
extern void gistadjscans(Relation r, int op, BlockNumber blkno, OffsetNumber offnum);
extern void AtEOXact_gist(void);
extern void AtEOSubXact_gist(TransactionId childXid);
extern void ReleaseResources_gist(void);
#endif /* GISTSCAN_H */

5
src/include/access/hash.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/hash.h,v 1.55 2004/07/01 00:51:38 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/hash.h,v 1.56 2004/07/17 03:30:38 tgl Exp $
*
* NOTES
* modeled after Margo Seltzer's hash implementation for unix.
@ -292,8 +292,7 @@ extern void _hash_expandtable(Relation rel, Buffer metabuf);
extern void _hash_regscan(IndexScanDesc scan);
extern void _hash_dropscan(IndexScanDesc scan);
extern bool _hash_has_active_scan(Relation rel, Bucket bucket);
extern void AtEOXact_hash(void);
extern void AtEOSubXact_hash(TransactionId childXid);
extern void ReleaseResources_hash(void);
/* hashsearch.c */
extern bool _hash_next(IndexScanDesc scan, ScanDirection dir);

4
src/include/access/nbtree.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/nbtree.h,v 1.79 2004/07/11 18:01:45 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/nbtree.h,v 1.80 2004/07/17 03:30:38 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -402,8 +402,6 @@ typedef BTScanOpaqueData *BTScanOpaque;
/*
* prototypes for functions in nbtree.c (external entry points for btree)
*/
extern void AtEOXact_nbtree(void);
extern Datum btbuild(PG_FUNCTION_ARGS);
extern Datum btinsert(PG_FUNCTION_ARGS);
extern Datum btgettuple(PG_FUNCTION_ARGS);

5
src/include/access/rtree.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/rtree.h,v 1.33 2004/07/01 00:51:38 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/rtree.h,v 1.34 2004/07/17 03:30:38 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -129,8 +129,7 @@ extern void rtree_desc(char *buf, uint8 xl_info, char *rec);
/* rtscan.c */
extern void rtadjscans(Relation r, int op, BlockNumber blkno,
OffsetNumber offnum);
extern void AtEOXact_rtree(void);
extern void AtEOSubXact_rtree(TransactionId childXid);
extern void ReleaseResources_rtree(void);
/* rtstrat.c */
extern StrategyNumber RTMapToInternalOperator(StrategyNumber strat);

59
src/include/access/xact.h
View File

@ -7,17 +7,16 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/xact.h,v 1.64 2004/07/01 00:51:38 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/xact.h,v 1.65 2004/07/17 03:30:38 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef XACT_H
#define XACT_H
#include "access/transam.h"
#include "access/xlog.h"
#include "utils/nabstime.h"
#include "utils/timestamp.h"
/*
* Xact isolation levels
@ -40,63 +39,11 @@ extern int XactIsoLevel;
extern bool DefaultXactReadOnly;
extern bool XactReadOnly;
/*
* transaction states - transaction state from server perspective
*/
typedef enum TransState
{
TRANS_DEFAULT,
TRANS_START,
TRANS_INPROGRESS,
TRANS_COMMIT,
TRANS_ABORT
} TransState;
/*
* transaction block states - transaction state of client queries
*/
typedef enum TBlockState
{
TBLOCK_DEFAULT,
TBLOCK_STARTED,
TBLOCK_BEGIN,
TBLOCK_INPROGRESS,
TBLOCK_END,
TBLOCK_ABORT,
TBLOCK_ENDABORT,
TBLOCK_SUBBEGIN,
TBLOCK_SUBBEGINABORT,
TBLOCK_SUBINPROGRESS,
TBLOCK_SUBEND,
TBLOCK_SUBABORT,
TBLOCK_SUBENDABORT_OK,
TBLOCK_SUBENDABORT_ERROR
} TBlockState;
/*
* end-of-transaction cleanup callbacks for dynamically loaded modules
*/
typedef void (*EOXactCallback) (bool isCommit, void *arg);
/*
* transaction state structure
*/
typedef struct TransactionStateData
{
TransactionId transactionIdData; /* my XID */
CommandId commandId; /* current CID */
TransState state; /* low-level state */
TBlockState blockState; /* high-level state */
int nestingLevel; /* nest depth */
MemoryContext curTransactionContext; /* my xact-lifetime context */
List *childXids; /* subcommitted child XIDs */
AclId currentUser; /* subxact start current_user */
struct TransactionStateData *parent; /* back link to parent */
} TransactionStateData;
typedef TransactionStateData *TransactionState;
/* ----------------
* transaction-related XLOG entries
@ -168,7 +115,7 @@ extern void UnregisterEOXactCallback(EOXactCallback callback, void *arg);
extern void RecordTransactionCommit(void);
extern int xactGetCommittedChildren(TransactionId **ptr, bool metoo);
extern int xactGetCommittedChildren(TransactionId **ptr);
extern void XactPushRollback(void (*func) (void *), void *data);
extern void XactPopRollback(void);

4
src/include/commands/portalcmds.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/commands/portalcmds.h,v 1.14 2003/11/29 22:40:59 pgsql Exp $
* $PostgreSQL: pgsql/src/include/commands/portalcmds.h,v 1.15 2004/07/17 03:30:56 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -24,7 +24,7 @@ extern void PerformPortalFetch(FetchStmt *stmt, DestReceiver *dest,
extern void PerformPortalClose(const char *name);
extern void PortalCleanup(Portal portal, bool isError);
extern void PortalCleanup(Portal portal);
extern void PersistHoldablePortal(Portal portal);

30
src/include/storage/bufmgr.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.83 2004/07/01 00:51:43 tgl Exp $
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.84 2004/07/17 03:31:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -92,31 +92,6 @@ extern int32 *LocalRefCount;
) \
)
/*
* IncrBufferRefCount
* Increment the pin count on a buffer that we have *already* pinned
* at least once.
*
* This macro cannot be used on a buffer we do not have pinned,
* because it doesn't change the shared buffer state. Therefore the
* Assert checks are for refcount > 0. Someone got this wrong once...
*/
#define IncrBufferRefCount(buffer) \
( \
BufferIsLocal(buffer) ? \
( \
(void) AssertMacro((buffer) >= -NLocBuffer), \
(void) AssertMacro(LocalRefCount[-(buffer) - 1] > 0), \
(void) LocalRefCount[-(buffer) - 1]++ \
) \
: \
( \
(void) AssertMacro(!BAD_BUFFER_ID(buffer)), \
(void) AssertMacro(PrivateRefCount[(buffer) - 1] > 0), \
(void) PrivateRefCount[(buffer) - 1]++ \
) \
)
/*
* BufferGetBlock
* Returns a reference to a disk page image associated with a buffer.
@ -138,6 +113,7 @@ extern int32 *LocalRefCount;
*/
extern Buffer ReadBuffer(Relation reln, BlockNumber blockNum);
extern void ReleaseBuffer(Buffer buffer);
extern void IncrBufferRefCount(Buffer buffer);
extern void WriteBuffer(Buffer buffer);
extern void WriteNoReleaseBuffer(Buffer buffer);
extern Buffer ReleaseAndReadBuffer(Buffer buffer, Relation relation,
@ -148,8 +124,6 @@ extern void InitBufferPoolAccess(void);
extern char *ShowBufferUsage(void);
extern void ResetBufferUsage(void);
extern void AtEOXact_Buffers(bool isCommit);
extern void AtSubStart_Buffers(void);
extern void AtEOSubXact_Buffers(bool isCommit);
extern void FlushBufferPool(void);
extern BlockNumber BufferGetBlockNumber(Buffer buffer);
extern BlockNumber RelationGetNumberOfBlocks(Relation relation);

12
src/include/storage/lock.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/lock.h,v 1.78 2004/07/01 00:51:43 tgl Exp $
* $PostgreSQL: pgsql/src/include/storage/lock.h,v 1.79 2004/07/17 03:31:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -26,14 +26,6 @@ typedef struct PROC_QUEUE
int size; /* number of entries in list */
} PROC_QUEUE;
/* Release options for LockReleaseAll */
typedef enum
{
ReleaseAll, /* All my locks */
ReleaseAllExceptSession, /* All except session locks (Xid = 0) */
ReleaseGivenXids /* Only locks with Xids in given array */
} LockReleaseWhich;
/* struct PGPROC is declared in storage/proc.h, but must forward-reference it */
typedef struct PGPROC PGPROC;
@ -248,7 +240,7 @@ extern bool LockAcquire(LOCKMETHODID lockmethodid, LOCKTAG *locktag,
extern bool LockRelease(LOCKMETHODID lockmethodid, LOCKTAG *locktag,
TransactionId xid, LOCKMODE lockmode);
extern bool LockReleaseAll(LOCKMETHODID lockmethodid, PGPROC *proc,
LockReleaseWhich which, int nxids, TransactionId *xids);
bool allxids);
extern int LockCheckConflicts(LockMethod lockMethodTable,
LOCKMODE lockmode,
LOCK *lock, PROCLOCK *proclock, PGPROC *proc,

9
src/include/storage/proc.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/proc.h,v 1.68 2004/07/01 00:51:43 tgl Exp $
* $PostgreSQL: pgsql/src/include/storage/proc.h,v 1.69 2004/07/17 03:31:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -34,7 +34,7 @@ struct PGPROC
SHM_QUEUE links; /* list link if process is in a list */
PGSemaphoreData sem; /* ONE semaphore to sleep on */
int errType; /* STATUS_OK or STATUS_ERROR after wakeup */
int waitStatus; /* STATUS_OK or STATUS_ERROR after wakeup */
TransactionId xid; /* transaction currently being executed by
* this proc */
@ -103,13 +103,12 @@ extern int ProcGlobalSemas(int maxBackends);
extern void InitProcGlobal(int maxBackends);
extern void InitProcess(void);
extern void InitDummyProcess(int proctype);
extern void ProcReleaseLocks(LockReleaseWhich which,
int nxids, TransactionId *xids);
extern void ProcReleaseLocks(bool isCommit);
extern void ProcQueueInit(PROC_QUEUE *queue);
extern int ProcSleep(LockMethod lockMethodTable, LOCKMODE lockmode,
LOCK *lock, PROCLOCK *proclock);
extern PGPROC *ProcWakeup(PGPROC *proc, int errType);
extern PGPROC *ProcWakeup(PGPROC *proc, int waitStatus);
extern void ProcLockWakeup(LockMethod lockMethodTable, LOCK *lock);
extern bool LockWaitCancel(void);

3
src/include/storage/smgr.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/smgr.h,v 1.45 2004/07/01 00:51:43 tgl Exp $
* $PostgreSQL: pgsql/src/include/storage/smgr.h,v 1.46 2004/07/17 03:31:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -66,7 +66,6 @@ extern BlockNumber smgrtruncate(SMgrRelation reln, BlockNumber nblocks,
extern void smgrimmedsync(SMgrRelation reln);
extern void smgrDoPendingDeletes(bool isCommit);
extern int smgrGetPendingDeletes(bool forCommit, RelFileNode **ptr);
extern void AtSubStart_smgr(void);
extern void AtSubCommit_smgr(void);
extern void AtSubAbort_smgr(void);
extern void smgrcommit(void);

10
src/include/utils/catcache.h
View File

@ -13,7 +13,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/catcache.h,v 1.49 2004/07/01 00:51:44 tgl Exp $
* $PostgreSQL: pgsql/src/include/utils/catcache.h,v 1.50 2004/07/17 03:31:47 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -101,9 +101,6 @@ typedef struct catctup
* and negative entries is identical.
*/
int refcount; /* number of active references */
int *prev_refcount; /* refcounts for upper subtransactions */
int numpushes; /* number of used refcounts in the array */
int numalloc; /* allocated size of array */
bool dead; /* dead but not yet removed? */
bool negative; /* negative cache entry? */
uint32 hash_value; /* hash value for this tuple's keys */
@ -142,9 +139,6 @@ typedef struct catclist
*/
Dlelem cache_elem; /* list member of per-catcache list */
int refcount; /* number of active references */
int *prev_refcount; /* refcounts for upper subtransactions */
int numpushes; /* number of used refcounts in the array */
int numalloc; /* allocated size of array */
bool dead; /* dead but not yet removed? */
bool ordered; /* members listed in index order? */
short nkeys; /* number of lookup keys specified */
@ -169,8 +163,6 @@ extern DLLIMPORT MemoryContext CacheMemoryContext;
extern void CreateCacheMemoryContext(void);
extern void AtEOXact_CatCache(bool isCommit);
extern void AtSubStart_CatCache(void);
extern void AtEOSubXact_CatCache(bool isCommit);
extern CatCache *InitCatCache(int id, const char *relname, const char *indname,
int reloidattr,

32
src/include/utils/portal.h
View File

@ -39,7 +39,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/portal.h,v 1.49 2004/07/01 00:51:44 tgl Exp $
* $PostgreSQL: pgsql/src/include/utils/portal.h,v 1.50 2004/07/17 03:31:47 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -48,6 +48,7 @@
#include "executor/execdesc.h"
#include "nodes/memnodes.h"
#include "utils/resowner.h"
#include "utils/tuplestore.h"
@ -79,6 +80,20 @@ typedef enum PortalStrategy
PORTAL_MULTI_QUERY
} PortalStrategy;
/*
* A portal is always in one of these states. It is possible to transit
* from ACTIVE back to READY if the query is not run to completion;
* otherwise we never back up in status.
*/
typedef enum PortalStatus
{
PORTAL_NEW, /* in process of creation */
PORTAL_READY, /* PortalStart complete, can run it */
PORTAL_ACTIVE, /* portal is running (can't delete it) */
PORTAL_DONE, /* portal is finished (don't re-run it) */
PORTAL_FAILED /* portal got error (can't re-run it) */
} PortalStatus;
/*
* Note: typedef Portal is declared in tcop/dest.h as
* typedef struct PortalData *Portal;
@ -89,7 +104,8 @@ typedef struct PortalData
/* Bookkeeping data */
const char *name; /* portal's name */
MemoryContext heap; /* subsidiary memory for portal */
void (*cleanup) (Portal portal, bool isError); /* cleanup hook */
ResourceOwner resowner; /* resources owned by portal */
void (*cleanup) (Portal portal); /* cleanup hook */
TransactionId createXact; /* the xid of the creating xact */
/* The query or queries the portal will execute */
@ -113,10 +129,8 @@ typedef struct PortalData
int cursorOptions; /* DECLARE CURSOR option bits */
/* Status data */
bool portalReady; /* PortalStart complete? */
PortalStatus status; /* see above */
bool portalUtilReady; /* PortalRunUtility complete? */
bool portalActive; /* portal is running (can't delete it) */
bool portalDone; /* portal is finished (don't re-run it) */
/* If not NULL, Executor is active; call ExecutorEnd eventually: */
QueryDesc *queryDesc; /* info needed for executor invocation */
@ -167,12 +181,14 @@ extern void EnablePortalManager(void);
extern void AtCommit_Portals(void);
extern void AtAbort_Portals(void);
extern void AtCleanup_Portals(void);
extern void AtSubCommit_Portals(TransactionId parentXid);
extern void AtSubAbort_Portals(void);
extern void AtSubCommit_Portals(TransactionId parentXid,
ResourceOwner parentXactOwner);
extern void AtSubAbort_Portals(TransactionId parentXid,
ResourceOwner parentXactOwner);
extern void AtSubCleanup_Portals(void);
extern Portal CreatePortal(const char *name, bool allowDup, bool dupSilent);
extern Portal CreateNewPortal(void);
extern void PortalDrop(Portal portal, bool isError);
extern void PortalDrop(Portal portal, bool isTopCommit);
extern void DropDependentPortals(MemoryContext queryContext);
extern Portal GetPortalByName(const char *name);
extern void PortalDefineQuery(Portal portal,

31
src/include/utils/rel.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/rel.h,v 1.75 2004/07/01 00:51:44 tgl Exp $
* $PostgreSQL: pgsql/src/include/utils/rel.h,v 1.76 2004/07/17 03:31:47 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -110,9 +110,6 @@ typedef struct RelationData
BlockNumber rd_targblock; /* current insertion target block, or
* InvalidBlockNumber */
int rd_refcnt; /* reference count */
int *rd_prevrefcnt; /* reference count stack */
int rd_numalloc; /* stack allocated size */
int rd_numpushed; /* stack used size */
bool rd_isnew; /* rel was created in current xact */
/*
@ -190,28 +187,6 @@ typedef Relation *RelationPtr;
#define RelationHasReferenceCountZero(relation) \
((bool)((relation)->rd_refcnt == 0))
/*
* RelationSetReferenceCount
* Sets relation reference count.
*/
#define RelationSetReferenceCount(relation,count) \
((relation)->rd_refcnt = (count))
/*
* RelationIncrementReferenceCount
* Increments relation reference count.
*/
#define RelationIncrementReferenceCount(relation) \
((relation)->rd_refcnt += 1)
/*
* RelationDecrementReferenceCount
* Decrements relation reference count.
*/
#define RelationDecrementReferenceCount(relation) \
(AssertMacro((relation)->rd_refcnt > 0), \
(relation)->rd_refcnt -= 1)
/*
* RelationGetForm
* Returns pg_class tuple for a relation.
@ -255,4 +230,8 @@ typedef Relation *RelationPtr;
#define RelationGetNamespace(relation) \
((relation)->rd_rel->relnamespace)
/* routines in utils/cache/relcache.c */
extern void RelationIncrementReferenceCount(Relation rel);
extern void RelationDecrementReferenceCount(Relation rel);
#endif /* REL_H */

4
src/include/utils/relcache.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/relcache.h,v 1.41 2004/07/01 00:51:45 tgl Exp $
* $PostgreSQL: pgsql/src/include/utils/relcache.h,v 1.42 2004/07/17 03:31:47 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -66,8 +66,6 @@ extern void RelationCacheInvalidateEntry(Oid relationId, RelFileNode *rnode);
extern void RelationCacheInvalidate(void);
extern void AtEOXact_RelationCache(bool isCommit);
extern void AtSubStart_RelationCache(void);
extern void AtEOSubXact_RelationCache(bool isCommit);
/*
* Routines to help manage rebuilding of relcache init file

121
src/include/utils/resowner.h Normal file
View File

@ -0,0 +1,121 @@
/*-------------------------------------------------------------------------
*
* resowner.h
* POSTGRES resource owner definitions.
*
* Query-lifespan resources are tracked by associating them with
* ResourceOwner objects. This provides a simple mechanism for ensuring
* that such resources are freed at the right time.
* See utils/resowner/README for more info.
*
*
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/resowner.h,v 1.1 2004/07/17 03:31:47 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef RESOWNER_H
#define RESOWNER_H
#include "storage/buf.h"
#include "storage/lock.h"
#include "utils/catcache.h"
#include "utils/rel.h"
/*
* ResourceOwner objects are an opaque data structure known only within
* resowner.c.
*/
typedef struct ResourceOwnerData *ResourceOwner;
/*
* Globally known ResourceOwners
*/
extern DLLIMPORT ResourceOwner CurrentResourceOwner;
extern DLLIMPORT ResourceOwner CurTransactionResourceOwner;
extern DLLIMPORT ResourceOwner TopTransactionResourceOwner;
/*
* Resource releasing is done in three phases: pre-locks, locks, and
* post-locks. The pre-lock phase must release any resources that are
* visible to other backends (such as pinned buffers); this ensures that
* when we release a lock that another backend may be waiting on, it will
* see us as being fully out of our transaction. The post-lock phase
* should be used for backend-internal cleanup.
*/
typedef enum
{
RESOURCE_RELEASE_BEFORE_LOCKS,
RESOURCE_RELEASE_LOCKS,
RESOURCE_RELEASE_AFTER_LOCKS
} ResourceReleasePhase;
/*
* Dynamically loaded modules can get control during ResourceOwnerRelease
* by providing a callback of this form.
*/
typedef void (*ResourceReleaseCallback) (ResourceReleasePhase phase,
bool isCommit,
bool isTopLevel,
void *arg);
/*
* Functions in resowner.c
*/
/* generic routines */
extern ResourceOwner ResourceOwnerCreate(ResourceOwner parent,
const char *name);
extern void ResourceOwnerRelease(ResourceOwner owner,
ResourceReleasePhase phase,
bool isCommit,
bool isTopLevel);
extern void ResourceOwnerDelete(ResourceOwner owner);
extern void ResourceOwnerNewParent(ResourceOwner owner,
ResourceOwner newparent);
extern void RegisterResourceReleaseCallback(ResourceReleaseCallback callback,
void *arg);
extern void UnregisterResourceReleaseCallback(ResourceReleaseCallback callback,
void *arg);
/* support for buffer refcount management */
extern void ResourceOwnerEnlargeBuffers(ResourceOwner owner);
extern void ResourceOwnerRememberBuffer(ResourceOwner owner, Buffer buffer);
extern void ResourceOwnerForgetBuffer(ResourceOwner owner, Buffer buffer);
/* support for lock management */
extern void ResourceOwnerEnlargeLocks(ResourceOwner owner);
extern void ResourceOwnerRememberLock(ResourceOwner owner,
LOCKTAG *locktag,
TransactionId xid,
LOCKMODE lockmode);
extern void ResourceOwnerForgetLock(ResourceOwner owner,
LOCKTAG *locktag,
TransactionId xid,
LOCKMODE lockmode);
/* support for catcache refcount management */
extern void ResourceOwnerEnlargeCatCacheRefs(ResourceOwner owner);
extern void ResourceOwnerRememberCatCacheRef(ResourceOwner owner,
HeapTuple tuple);
extern void ResourceOwnerForgetCatCacheRef(ResourceOwner owner,
HeapTuple tuple);
extern void ResourceOwnerEnlargeCatCacheListRefs(ResourceOwner owner);
extern void ResourceOwnerRememberCatCacheListRef(ResourceOwner owner,
CatCList *list);
extern void ResourceOwnerForgetCatCacheListRef(ResourceOwner owner,
CatCList *list);
/* support for relcache refcount management */
extern void ResourceOwnerEnlargeRelationRefs(ResourceOwner owner);
extern void ResourceOwnerRememberRelationRef(ResourceOwner owner,
Relation rel);
extern void ResourceOwnerForgetRelationRef(ResourceOwner owner,
Relation rel);
#endif /* RESOWNER_H */

66
src/test/regress/expected/transactions.out
View File

@ -191,6 +191,72 @@ SELECT 1; -- this should work
1
(1 row)
-- check non-transactional behavior of cursors
BEGIN;
DECLARE c CURSOR FOR SELECT unique2 FROM tenk1;
BEGIN;
FETCH 10 FROM c;
unique2
---------
0
1
2
3
4
5
6
7
8
9
(10 rows)
ROLLBACK;
BEGIN;
FETCH 10 FROM c;
unique2
---------
10
11
12
13
14
15
16
17
18
19
(10 rows)
COMMIT;
FETCH 10 FROM c;
unique2
---------
20
21
22
23
24
25
26
27
28
29
(10 rows)
CLOSE c;
DECLARE c CURSOR FOR SELECT unique2/0 FROM tenk1;
BEGIN;
FETCH 10 FROM c;
ERROR: division by zero
ROLLBACK;
-- c is now dead to the world ...
BEGIN;
FETCH 10 FROM c;
ERROR: portal "c" cannot be run
ROLLBACK;
FETCH 10 FROM c;
ERROR: portal "c" cannot be run
COMMIT;
DROP TABLE foo;
DROP TABLE baz;
DROP TABLE barbaz;

22
src/test/regress/sql/transactions.sql
View File

@ -127,6 +127,28 @@ BEGIN;
COMMIT;
SELECT 1; -- this should work
-- check non-transactional behavior of cursors
BEGIN;
DECLARE c CURSOR FOR SELECT unique2 FROM tenk1;
BEGIN;
FETCH 10 FROM c;
ROLLBACK;
BEGIN;
FETCH 10 FROM c;
COMMIT;
FETCH 10 FROM c;
CLOSE c;
DECLARE c CURSOR FOR SELECT unique2/0 FROM tenk1;
BEGIN;
FETCH 10 FROM c;
ROLLBACK;
-- c is now dead to the world ...
BEGIN;
FETCH 10 FROM c;
ROLLBACK;
FETCH 10 FROM c;
COMMIT;
DROP TABLE foo;
DROP TABLE baz;