beda4814c1
There are still some things that need refinement; in particular I fear that the recognized set of error condition names probably has little in common with what Oracle recognizes. But it's a start.
136 lines
4.3 KiB
C
136 lines
4.3 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) 1996-2003, 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 1.68 2004/07/31 07:39:19 tgl 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/xlog.h"
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#include "storage/relfilenode.h"
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#include "nodes/pg_list.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_READ_UNCOMMITTED 0
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#define XACT_READ_COMMITTED 1
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#define XACT_REPEATABLE_READ 2
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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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* We only implement two distinct levels, so this is a convenience to
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* check which level we're really using internally.
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*/
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#define IsXactIsoLevelSerializable ((XactIsoLevel == XACT_REPEATABLE_READ || XactIsoLevel == XACT_SERIALIZABLE))
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/* Xact read-only state */
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extern bool DefaultXactReadOnly;
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extern bool XactReadOnly;
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/*
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* end-of-transaction cleanup callbacks for dynamically loaded modules
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*/
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typedef void (*EOXactCallback) (bool isCommit, void *arg);
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/* ----------------
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* transaction-related XLOG entries
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* ----------------
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*/
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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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int nrels; /* number of RelFileNodes */
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int nsubxacts; /* number of subtransaction XIDs */
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/* Array of RelFileNode(s) to drop at commit */
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RelFileNode xnodes[1]; /* VARIABLE LENGTH ARRAY */
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/* ARRAY OF COMMITTED SUBTRANSACTION XIDs FOLLOWS */
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} xl_xact_commit;
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#define MinSizeOfXactCommit offsetof(xl_xact_commit, xnodes)
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typedef struct xl_xact_abort
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{
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time_t xtime;
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int nrels; /* number of RelFileNodes */
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int nsubxacts; /* number of subtransaction XIDs */
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/* Array of RelFileNode(s) to drop at abort */
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RelFileNode xnodes[1]; /* VARIABLE LENGTH ARRAY */
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/* ARRAY OF ABORTED SUBTRANSACTION XIDs FOLLOWS */
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} xl_xact_abort;
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#define MinSizeOfXactAbort offsetof(xl_xact_abort, xnodes)
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/* ----------------
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* extern definitions
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* ----------------
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*/
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extern bool IsTransactionState(void);
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extern bool IsAbortedTransactionBlockState(void);
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extern TransactionId GetTopTransactionId(void);
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extern TransactionId GetCurrentTransactionId(void);
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extern CommandId GetCurrentCommandId(void);
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extern AbsoluteTime GetCurrentTransactionStartTime(void);
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extern AbsoluteTime GetCurrentTransactionStartTimeUsec(int *usec);
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extern int GetCurrentTransactionNestLevel(void);
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extern bool TransactionIdIsCurrentTransactionId(TransactionId xid);
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extern void CommandCounterIncrement(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 bool EndTransactionBlock(void);
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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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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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extern bool IsSubTransaction(void);
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extern bool IsTransactionBlock(void);
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extern bool IsTransactionOrTransactionBlock(void);
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extern char TransactionBlockStatusCode(void);
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extern void AbortOutOfAnyTransaction(void);
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extern void PreventTransactionChain(void *stmtNode, const char *stmtType);
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extern void RequireTransactionChain(void *stmtNode, const char *stmtType);
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extern bool IsInTransactionChain(void *stmtNode);
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extern void RegisterEOXactCallback(EOXactCallback callback, void *arg);
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extern void UnregisterEOXactCallback(EOXactCallback callback, void *arg);
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extern void RecordTransactionCommit(void);
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extern int xactGetCommittedChildren(TransactionId **ptr);
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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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#endif /* XACT_H */
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