1996-08-27 23:50:29 +02:00
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/*-------------------------------------------------------------------------
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*
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1999-02-14 00:22:53 +01:00
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* xact.h
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2000-07-28 03:04:40 +02:00
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* postgres transaction system definitions
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1996-08-27 23:50:29 +02:00
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*
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*
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2007-01-05 23:20:05 +01:00
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* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
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2000-01-26 06:58:53 +01:00
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* Portions Copyright (c) 1994, Regents of the University of California
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1996-08-27 23:50:29 +02:00
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*
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2007-11-30 22:22:54 +01:00
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* $PostgreSQL: pgsql/src/include/access/xact.h,v 1.92 2007/11/30 21:22:54 tgl Exp $
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1996-08-27 23:50:29 +02:00
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef XACT_H
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#define XACT_H
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2000-11-21 22:16:06 +01:00
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#include "access/xlog.h"
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2004-07-27 07:11:48 +02:00
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#include "nodes/pg_list.h"
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2006-07-11 20:26:11 +02:00
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#include "storage/relfilenode.h"
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2005-06-30 00:51:57 +02:00
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#include "utils/timestamp.h"
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2004-07-17 05:32:14 +02:00
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1996-08-27 23:50:29 +02:00
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2000-07-28 03:04:40 +02:00
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/*
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* Xact isolation levels
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*/
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2003-11-06 23:08:15 +01:00
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#define XACT_READ_UNCOMMITTED 0
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2000-07-28 03:04:40 +02:00
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#define XACT_READ_COMMITTED 1
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2003-11-06 23:08:15 +01:00
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#define XACT_REPEATABLE_READ 2
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2000-07-28 03:04:40 +02:00
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#define XACT_SERIALIZABLE 3
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extern int DefaultXactIsoLevel;
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extern int XactIsoLevel;
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2003-04-26 22:23:00 +02:00
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2003-11-06 23:08:15 +01:00
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/*
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2004-09-06 01:01:26 +02:00
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* We only implement two isolation levels internally. This macro should
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* be used to check which one is selected.
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2003-11-06 23:08:15 +01:00
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*/
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2004-09-06 01:01:26 +02:00
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#define IsXactIsoLevelSerializable (XactIsoLevel >= XACT_REPEATABLE_READ)
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2003-11-06 23:08:15 +01:00
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2003-04-26 22:23:00 +02:00
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/* Xact read-only state */
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2003-08-04 02:43:34 +02:00
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extern bool DefaultXactReadOnly;
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extern bool XactReadOnly;
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2003-01-10 23:03:30 +01:00
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2007-08-02 00:45:09 +02:00
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/* Asynchronous commits */
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extern bool XactSyncCommit;
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2003-09-29 01:26:20 +02:00
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/*
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2004-08-01 19:32:22 +02:00
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* start- and end-of-transaction callbacks for dynamically loaded modules
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2003-09-29 01:26:20 +02:00
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*/
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2004-08-01 19:32:22 +02:00
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typedef enum
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{
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XACT_EVENT_COMMIT,
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2005-06-18 00:32:51 +02:00
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XACT_EVENT_ABORT,
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XACT_EVENT_PREPARE
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2004-08-01 19:32:22 +02:00
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} XactEvent;
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2004-09-16 18:58:44 +02:00
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typedef void (*XactCallback) (XactEvent event, void *arg);
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typedef enum
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{
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SUBXACT_EVENT_START_SUB,
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SUBXACT_EVENT_COMMIT_SUB,
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SUBXACT_EVENT_ABORT_SUB
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} SubXactEvent;
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typedef void (*SubXactCallback) (SubXactEvent event, SubTransactionId mySubid,
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2005-10-15 04:49:52 +02:00
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SubTransactionId parentSubid, void *arg);
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2003-09-29 01:26:20 +02:00
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1996-08-27 23:50:29 +02:00
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2003-04-26 22:23:00 +02:00
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/* ----------------
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* transaction-related XLOG entries
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* ----------------
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1996-08-27 23:50:29 +02:00
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*/
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2000-10-20 13:01:21 +02:00
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/*
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* XLOG allows to store some information in high 4 bits of log
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* record xl_info field
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*/
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2005-06-18 00:32:51 +02:00
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#define XLOG_XACT_COMMIT 0x00
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#define XLOG_XACT_PREPARE 0x10
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#define XLOG_XACT_ABORT 0x20
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#define XLOG_XACT_COMMIT_PREPARED 0x30
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#define XLOG_XACT_ABORT_PREPARED 0x40
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2000-10-20 13:01:21 +02:00
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typedef struct xl_xact_commit
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{
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2007-11-15 22:14:46 +01:00
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TimestampTz xact_time; /* time of commit */
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2004-07-01 02:52:04 +02:00
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int nrels; /* number of RelFileNodes */
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int nsubxacts; /* number of subtransaction XIDs */
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2004-02-11 23:55:26 +01:00
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/* Array of RelFileNode(s) to drop at commit */
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2004-08-29 07:07:03 +02:00
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RelFileNode xnodes[1]; /* VARIABLE LENGTH ARRAY */
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2004-07-01 02:52:04 +02:00
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/* ARRAY OF COMMITTED SUBTRANSACTION XIDs FOLLOWS */
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2000-10-20 13:01:21 +02:00
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} xl_xact_commit;
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2004-08-29 07:07:03 +02:00
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#define MinSizeOfXactCommit offsetof(xl_xact_commit, xnodes)
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2000-10-20 13:01:21 +02:00
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typedef struct xl_xact_abort
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{
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2007-11-15 22:14:46 +01:00
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TimestampTz xact_time; /* time of abort */
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2004-07-01 02:52:04 +02:00
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int nrels; /* number of RelFileNodes */
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int nsubxacts; /* number of subtransaction XIDs */
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2004-02-11 23:55:26 +01:00
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/* Array of RelFileNode(s) to drop at abort */
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2004-08-29 07:07:03 +02:00
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RelFileNode xnodes[1]; /* VARIABLE LENGTH ARRAY */
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2004-07-01 02:52:04 +02:00
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/* ARRAY OF ABORTED SUBTRANSACTION XIDs FOLLOWS */
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2000-10-20 13:01:21 +02:00
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} xl_xact_abort;
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2004-02-11 23:55:26 +01:00
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#define MinSizeOfXactAbort offsetof(xl_xact_abort, xnodes)
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2005-06-18 00:32:51 +02:00
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/*
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* COMMIT_PREPARED and ABORT_PREPARED are identical to COMMIT/ABORT records
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* except that we have to store the XID of the prepared transaction explicitly
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* --- the XID in the record header will be for the transaction doing the
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* COMMIT PREPARED or ABORT PREPARED command.
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*/
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typedef struct xl_xact_commit_prepared
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{
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TransactionId xid; /* XID of prepared xact */
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xl_xact_commit crec; /* COMMIT record */
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/* MORE DATA FOLLOWS AT END OF STRUCT */
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} xl_xact_commit_prepared;
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#define MinSizeOfXactCommitPrepared offsetof(xl_xact_commit_prepared, crec.xnodes)
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typedef struct xl_xact_abort_prepared
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{
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TransactionId xid; /* XID of prepared xact */
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xl_xact_abort arec; /* ABORT record */
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/* MORE DATA FOLLOWS AT END OF STRUCT */
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} xl_xact_abort_prepared;
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#define MinSizeOfXactAbortPrepared offsetof(xl_xact_abort_prepared, arec.xnodes)
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2000-10-20 13:01:21 +02:00
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1996-08-27 23:50:29 +02:00
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/* ----------------
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1997-09-07 07:04:48 +02:00
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* extern definitions
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1996-08-27 23:50:29 +02:00
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* ----------------
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*/
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2002-04-01 05:34:27 +02:00
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extern bool IsTransactionState(void);
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1997-09-08 04:41:22 +02:00
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extern bool IsAbortedTransactionBlockState(void);
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2004-07-01 02:52:04 +02:00
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extern TransactionId GetTopTransactionId(void);
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2007-09-05 20:10:48 +02:00
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extern TransactionId GetTopTransactionIdIfAny(void);
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1996-08-27 23:50:29 +02:00
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extern TransactionId GetCurrentTransactionId(void);
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2004-09-16 18:58:44 +02:00
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extern TransactionId GetCurrentTransactionIdIfAny(void);
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extern SubTransactionId GetCurrentSubTransactionId(void);
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2007-11-30 22:22:54 +01:00
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extern CommandId GetCurrentCommandId(bool used);
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2005-06-30 00:51:57 +02:00
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extern TimestampTz GetCurrentTransactionStartTimestamp(void);
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2006-04-25 02:25:22 +02:00
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extern TimestampTz GetCurrentStatementStartTimestamp(void);
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2007-04-30 05:23:49 +02:00
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extern TimestampTz GetCurrentTransactionStopTimestamp(void);
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2006-04-25 02:25:22 +02:00
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extern void SetCurrentStatementStartTimestamp(void);
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2004-07-01 02:52:04 +02:00
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extern int GetCurrentTransactionNestLevel(void);
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1997-09-08 04:41:22 +02:00
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extern bool TransactionIdIsCurrentTransactionId(TransactionId xid);
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extern void CommandCounterIncrement(void);
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2007-08-02 00:45:09 +02:00
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extern void ForceSyncCommit(void);
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2003-05-14 05:26:03 +02:00
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extern void StartTransactionCommand(void);
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extern void CommitTransactionCommand(void);
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1997-09-08 04:41:22 +02:00
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extern void AbortCurrentTransaction(void);
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extern void BeginTransactionBlock(void);
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2004-07-27 07:11:48 +02:00
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extern bool EndTransactionBlock(void);
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2005-06-18 00:32:51 +02:00
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extern bool PrepareTransactionBlock(char *gid);
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2004-07-27 07:11:48 +02:00
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extern void UserAbortTransactionBlock(void);
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extern void ReleaseSavepoint(List *options);
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extern void DefineSavepoint(char *name);
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extern void RollbackToSavepoint(List *options);
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2004-07-31 09:39:21 +02:00
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extern void BeginInternalSubTransaction(char *name);
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extern void ReleaseCurrentSubTransaction(void);
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extern void RollbackAndReleaseCurrentSubTransaction(void);
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2004-07-01 02:52:04 +02:00
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extern bool IsSubTransaction(void);
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1997-09-08 04:41:22 +02:00
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extern bool IsTransactionBlock(void);
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2003-10-16 18:50:41 +02:00
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extern bool IsTransactionOrTransactionBlock(void);
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2003-04-26 22:23:00 +02:00
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extern char TransactionBlockStatusCode(void);
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1998-10-06 04:40:09 +02:00
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extern void AbortOutOfAnyTransaction(void);
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2007-03-13 01:33:44 +01:00
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extern void PreventTransactionChain(bool isTopLevel, const char *stmtType);
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extern void RequireTransactionChain(bool isTopLevel, const char *stmtType);
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extern bool IsInTransactionChain(bool isTopLevel);
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2004-08-01 19:32:22 +02:00
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extern void RegisterXactCallback(XactCallback callback, void *arg);
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extern void UnregisterXactCallback(XactCallback callback, void *arg);
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2004-09-16 18:58:44 +02:00
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extern void RegisterSubXactCallback(SubXactCallback callback, void *arg);
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extern void UnregisterSubXactCallback(SubXactCallback callback, void *arg);
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1996-08-27 23:50:29 +02:00
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2007-09-08 22:31:15 +02:00
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extern TransactionId RecordTransactionCommit(void);
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2000-10-28 18:21:00 +02:00
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2004-07-17 05:32:14 +02:00
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extern int xactGetCommittedChildren(TransactionId **ptr);
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2004-07-01 02:52:04 +02:00
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2001-03-22 05:01:46 +01:00
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extern void xact_redo(XLogRecPtr lsn, XLogRecord *record);
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2006-03-24 05:32:13 +01:00
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extern void xact_desc(StringInfo buf, uint8 xl_info, char *rec);
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2000-11-21 22:16:06 +01:00
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2001-11-05 18:46:40 +01:00
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#endif /* XACT_H */
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