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Two-phase commit. Original patch by Heikki Linnakangas, with additional
hacking by Alvaro Herrera and Tom Lane.
This commit is contained in:
Tom Lane
@@ -6,7 +6,7 @@
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* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/access/subtrans.h,v 1.5 2004/12/31 22:03:21 pgsql Exp $
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* $PostgreSQL: pgsql/src/include/access/subtrans.h,v 1.6 2005/06/17 22:32:48 tgl Exp $
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*/
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#ifndef SUBTRANS_H
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#define SUBTRANS_H
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@@ -18,7 +18,7 @@ extern TransactionId SubTransGetTopmostTransaction(TransactionId xid);
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extern int SUBTRANSShmemSize(void);
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extern void SUBTRANSShmemInit(void);
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extern void BootStrapSUBTRANS(void);
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extern void StartupSUBTRANS(void);
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extern void StartupSUBTRANS(TransactionId oldestActiveXID);
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extern void ShutdownSUBTRANS(void);
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extern void CheckPointSUBTRANS(void);
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extern void ExtendSUBTRANS(TransactionId newestXact);
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49
src/include/access/twophase.h
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49
src/include/access/twophase.h
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@@ -0,0 +1,49 @@
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/*-------------------------------------------------------------------------
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*
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* twophase.h
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* Two-phase-commit related declarations.
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*
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*
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* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/access/twophase.h,v 1.1 2005/06/17 22:32:48 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef TWOPHASE_H
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#define TWOPHASE_H
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#include "storage/lock.h"
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/*
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* GlobalTransactionData is defined in twophase.c; other places have no
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* business knowing the internal definition.
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*/
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typedef struct GlobalTransactionData *GlobalTransaction;
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/* GUC variable */
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extern int max_prepared_xacts;
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extern int TwoPhaseShmemSize(void);
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extern void TwoPhaseShmemInit(void);
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extern PGPROC *TwoPhaseGetDummyProc(TransactionId xid);
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extern GlobalTransaction MarkAsPreparing(TransactionId xid, Oid databaseid,
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char *gid, AclId owner);
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extern void MarkAsPrepared(GlobalTransaction gxact);
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extern void StartPrepare(GlobalTransaction gxact);
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extern void EndPrepare(GlobalTransaction gxact);
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extern TransactionId PrescanPreparedTransactions(void);
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extern void RecoverPreparedTransactions(void);
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extern void RecreateTwoPhaseFile(TransactionId xid, void *content, int len);
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extern void RemoveTwoPhaseFile(TransactionId xid, bool giveWarning);
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extern void FinishPreparedTransaction(char *gid, bool isCommit);
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#endif /* TWOPHASE_H */
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39
src/include/access/twophase_rmgr.h
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39
src/include/access/twophase_rmgr.h
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@@ -0,0 +1,39 @@
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/*-------------------------------------------------------------------------
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*
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* twophase_rmgr.h
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* Two-phase-commit resource managers definition
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*
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*
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* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/access/twophase_rmgr.h,v 1.1 2005/06/17 22:32:48 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef TWOPHASE_RMGR_H
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#define TWOPHASE_RMGR_H
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typedef void (*TwoPhaseCallback) (TransactionId xid, uint16 info,
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void *recdata, uint32 len);
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typedef uint8 TwoPhaseRmgrId;
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/*
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* Built-in resource managers
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*/
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#define TWOPHASE_RM_END_ID 0
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#define TWOPHASE_RM_LOCK_ID 1
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#define TWOPHASE_RM_INVAL_ID 2
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#define TWOPHASE_RM_FLATFILES_ID 3
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#define TWOPHASE_RM_NOTIFY_ID 4
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#define TWOPHASE_RM_MAX_ID TWOPHASE_RM_NOTIFY_ID
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extern const TwoPhaseCallback twophase_recover_callbacks[];
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extern const TwoPhaseCallback twophase_postcommit_callbacks[];
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extern const TwoPhaseCallback twophase_postabort_callbacks[];
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extern void RegisterTwoPhaseRecord(TwoPhaseRmgrId rmid, uint16 info,
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const void *data, uint32 len);
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#endif /* TWOPHASE_RMGR_H */
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@@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/access/xact.h,v 1.76 2005/06/06 17:01:24 tgl Exp $
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* $PostgreSQL: pgsql/src/include/access/xact.h,v 1.77 2005/06/17 22:32:48 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@@ -47,7 +47,8 @@ extern bool XactReadOnly;
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typedef enum
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{
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XACT_EVENT_COMMIT,
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XACT_EVENT_ABORT
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XACT_EVENT_ABORT,
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XACT_EVENT_PREPARE
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} XactEvent;
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typedef void (*XactCallback) (XactEvent event, void *arg);
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@@ -72,8 +73,11 @@ typedef void (*SubXactCallback) (SubXactEvent event, SubTransactionId mySubid,
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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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#define XLOG_XACT_COMMIT 0x00
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#define XLOG_XACT_ABORT 0x20
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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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typedef struct xl_xact_commit
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{
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@@ -99,6 +103,31 @@ typedef struct xl_xact_abort
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#define MinSizeOfXactAbort offsetof(xl_xact_abort, xnodes)
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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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/* ----------------
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* extern definitions
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@@ -121,6 +150,7 @@ extern void CommitTransactionCommand(void);
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extern void AbortCurrentTransaction(void);
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extern void BeginTransactionBlock(void);
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extern bool EndTransactionBlock(void);
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extern bool PrepareTransactionBlock(char *gid);
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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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