c3c09be34b
wit: Add a header record to each WAL segment file so that it can be reliably identified. Avoid splitting WAL records across segment files (this is not strictly necessary, but makes it simpler to incorporate the header records). Make WAL entries for file creation, deletion, and truncation (as foreseen but never implemented by Vadim). Also, add support for making XLOG_SEG_SIZE configurable at compile time, similarly to BLCKSZ. Fix a couple bugs I introduced in WAL replay during recent smgr API changes. initdb is forced due to changes in pg_control contents.
160 lines
4.3 KiB
C
160 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 1.61 2004/02/11 22:55:25 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/transam.h"
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#include "access/xlog.h"
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#include "utils/nabstime.h"
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#include "utils/timestamp.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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* transaction states - transaction state from server perspective
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*/
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typedef enum TransState
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{
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TRANS_DEFAULT,
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TRANS_START,
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TRANS_INPROGRESS,
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TRANS_COMMIT,
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TRANS_ABORT
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} TransState;
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/*
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* transaction block states - transaction state of client queries
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*/
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typedef enum TBlockState
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{
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TBLOCK_DEFAULT,
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TBLOCK_BEGIN,
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TBLOCK_INPROGRESS,
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TBLOCK_END,
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TBLOCK_ABORT,
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TBLOCK_ENDABORT
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} TBlockState;
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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 state structure
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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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AbsoluteTime startTime;
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int startTimeUsec;
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TransState state;
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TBlockState blockState;
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} TransactionStateData;
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typedef TransactionStateData *TransactionState;
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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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/* Array of RelFileNode(s) to drop at commit */
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/* The XLOG record length determines how many there are */
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RelFileNode xnodes[1]; /* VARIABLE LENGTH ARRAY */
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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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/* Array of RelFileNode(s) to drop at abort */
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/* The XLOG record length determines how many there are */
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RelFileNode xnodes[1]; /* VARIABLE LENGTH ARRAY */
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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 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 bool TransactionIdIsCurrentTransactionId(TransactionId xid);
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extern bool CommandIdIsCurrentCommandId(CommandId cid);
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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 void EndTransactionBlock(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 UserAbortTransactionBlock(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 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 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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