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

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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
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59
src/include/access/xact.h
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@ -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);