1 /*-------------------------------------------------------------------------
2  *
3  * twophase.h
4  *	  Two-phase-commit related declarations.
5  *
6  *
7  * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
8  * Portions Copyright (c) 1994, Regents of the University of California
9  *
10  * src/include/access/twophase.h
11  *
12  *-------------------------------------------------------------------------
13  */
14 #ifndef TWOPHASE_H
15 #define TWOPHASE_H
16 
17 #include "access/xlogdefs.h"
18 #include "datatype/timestamp.h"
19 #include "storage/lock.h"
20 
21 /*
22  * GlobalTransactionData is defined in twophase.c; other places have no
23  * business knowing the internal definition.
24  */
25 typedef struct GlobalTransactionData *GlobalTransaction;
26 
27 /* GUC variable */
28 extern PGDLLIMPORT int max_prepared_xacts;
29 
30 extern Size TwoPhaseShmemSize(void);
31 extern void TwoPhaseShmemInit(void);
32 
33 extern void AtAbort_Twophase(void);
34 extern void PostPrepare_Twophase(void);
35 
36 extern TransactionId TwoPhaseGetXidByVirtualXID(VirtualTransactionId vxid,
37 												bool *have_more);
38 extern PGPROC *TwoPhaseGetDummyProc(TransactionId xid);
39 extern BackendId TwoPhaseGetDummyBackendId(TransactionId xid);
40 
41 extern GlobalTransaction MarkAsPreparing(TransactionId xid, const char *gid,
42 				TimestampTz prepared_at,
43 				Oid owner, Oid databaseid);
44 
45 extern void StartPrepare(GlobalTransaction gxact);
46 extern void EndPrepare(GlobalTransaction gxact);
47 extern bool StandbyTransactionIdIsPrepared(TransactionId xid);
48 
49 extern TransactionId PrescanPreparedTransactions(TransactionId **xids_p,
50 							int *nxids_p);
51 extern void StandbyRecoverPreparedTransactions(bool overwriteOK);
52 extern void RecoverPreparedTransactions(void);
53 
54 extern void RecreateTwoPhaseFile(TransactionId xid, void *content, int len);
55 extern void RemoveTwoPhaseFile(TransactionId xid, bool giveWarning);
56 
57 extern void CheckPointTwoPhase(XLogRecPtr redo_horizon);
58 
59 extern void FinishPreparedTransaction(const char *gid, bool isCommit);
60 
61 #endif   /* TWOPHASE_H */
62