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152 lines
4.1 KiB
C
152 lines
4.1 KiB
C
/*-------------------------------------------------------------------------
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*
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* xact.h
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* postgres transaction system definitions
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*
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*
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* Portions Copyright (c) 1996-2001, 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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* $Id: xact.h,v 1.32 2001/01/24 19:43:20 momjian Exp $
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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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#include "access/transam.h"
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#include "access/xlog.h"
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#include "utils/nabstime.h"
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/*
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* Xact isolation levels
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*/
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#define XACT_DIRTY_READ 0 /* not implemented */
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#define XACT_READ_COMMITTED 1
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#define XACT_REPEATABLE_READ 2 /* not implemented */
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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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/* ----------------
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* transaction state structure
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* ----------------
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*/
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typedef struct TransactionStateData
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{
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TransactionId transactionIdData;
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CommandId commandId;
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CommandId scanCommandId;
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AbsoluteTime startTime;
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int state;
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int blockState;
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} TransactionStateData;
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typedef TransactionStateData *TransactionState;
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/* ----------------
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* transaction states
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* ----------------
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*/
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#define TRANS_DEFAULT 0
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#define TRANS_START 1
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#define TRANS_INPROGRESS 2
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#define TRANS_COMMIT 3
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#define TRANS_ABORT 4
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#define TRANS_DISABLED 5
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/* ----------------
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* transaction block states
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* ----------------
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*/
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#define TBLOCK_DEFAULT 0
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#define TBLOCK_BEGIN 1
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#define TBLOCK_INPROGRESS 2
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#define TBLOCK_END 3
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#define TBLOCK_ABORT 4
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#define TBLOCK_ENDABORT 5
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/* ----------------
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* transaction ID manipulation macros
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* ----------------
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*/
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#define TransactionIdIsValid(xid) ((bool) ((xid) != NullTransactionId))
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#define TransactionIdEquals(id1, id2) ((bool) ((id1) == (id2)))
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#define TransactionIdStore(xid, dest) \
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(*((TransactionId*) (dest)) = (TransactionId) (xid))
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#define StoreInvalidTransactionId(dest) \
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(*((TransactionId*) (dest)) = NullTransactionId)
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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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#define XLOG_XACT_COMMIT 0x00
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#define XLOG_XACT_ABORT 0x20
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typedef struct xl_xact_commit
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{
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time_t xtime;
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/*
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* Array of RelFileNode-s to drop may follow
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* at the end of struct
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*/
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} xl_xact_commit;
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#define SizeOfXactCommit ((offsetof(xl_xact_commit, xtime) + sizeof(time_t)))
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typedef struct xl_xact_abort
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{
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time_t xtime;
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} xl_xact_abort;
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#define SizeOfXactAbort ((offsetof(xl_xact_abort, xtime) + sizeof(time_t)))
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/* ----------------
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* extern definitions
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* ----------------
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*/
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extern int TransactionFlushEnabled(void);
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extern void SetTransactionFlushEnabled(bool state);
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extern bool IsAbortedTransactionBlockState(void);
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extern void OverrideTransactionSystem(bool flag);
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extern TransactionId GetCurrentTransactionId(void);
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extern CommandId GetCurrentCommandId(void);
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extern CommandId GetScanCommandId(void);
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extern void SetScanCommandId(CommandId);
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extern AbsoluteTime GetCurrentTransactionStartTime(void);
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extern bool TransactionIdIsCurrentTransactionId(TransactionId xid);
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extern bool CommandIdIsCurrentCommandId(CommandId cid);
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extern bool CommandIdGEScanCommandId(CommandId cid);
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extern void CommandCounterIncrement(void);
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extern void InitializeTransactionSystem(void);
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extern void StartTransactionCommand(void);
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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 void EndTransactionBlock(void);
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extern bool IsTransactionBlock(void);
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extern void UserAbortTransactionBlock(void);
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extern void AbortOutOfAnyTransaction(void);
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extern void RecordTransactionCommit(void);
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extern TransactionId DisabledTransactionId;
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extern void XactPushRollback(void (*func) (void *), void* data);
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extern void XactPopRollback(void);
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extern void xact_redo(XLogRecPtr lsn, XLogRecord *record);
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extern void xact_undo(XLogRecPtr lsn, XLogRecord *record);
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extern void xact_desc(char *buf, uint8 xl_info, char* rec);
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/* defined in xid.c */
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extern Datum xidin(PG_FUNCTION_ARGS);
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extern Datum xidout(PG_FUNCTION_ARGS);
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extern Datum xideq(PG_FUNCTION_ARGS);
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extern void TransactionIdAdd(TransactionId *xid, int value);
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#endif /* XACT_H */
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