clog.h 1.54 KB
Newer Older
1 2 3 4 5
/*
 * clog.h
 *
 * PostgreSQL transaction-commit-log manager
 *
6
 * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
7 8
 * Portions Copyright (c) 1994, Regents of the University of California
 *
9
 * $PostgreSQL: pgsql/src/include/access/clog.h,v 1.22 2008/10/20 19:18:18 alvherre Exp $
10 11 12 13 14 15 16 17 18
 */
#ifndef CLOG_H
#define CLOG_H

#include "access/xlog.h"

/*
 * Possible transaction statuses --- note that all-zeroes is the initial
 * state.
19 20 21
 *
 * A "subcommitted" transaction is a committed subtransaction whose parent
 * hasn't committed or aborted yet.
22 23 24 25 26 27
 */
typedef int XidStatus;

#define TRANSACTION_STATUS_IN_PROGRESS		0x00
#define TRANSACTION_STATUS_COMMITTED		0x01
#define TRANSACTION_STATUS_ABORTED			0x02
28
#define TRANSACTION_STATUS_SUB_COMMITTED	0x03
29 30


31 32 33 34
/* Number of SLRU buffers to use for clog */
#define NUM_CLOG_BUFFERS	8


35 36
extern void TransactionIdSetTreeStatus(TransactionId xid, int nsubxids, 
					TransactionId *subxids, XidStatus status, XLogRecPtr lsn);
37
extern XidStatus TransactionIdGetStatus(TransactionId xid, XLogRecPtr *lsn);
38

39
extern Size CLOGShmemSize(void);
40 41 42 43 44 45 46
extern void CLOGShmemInit(void);
extern void BootStrapCLOG(void);
extern void StartupCLOG(void);
extern void ShutdownCLOG(void);
extern void CheckPointCLOG(void);
extern void ExtendCLOG(TransactionId newestXact);
extern void TruncateCLOG(TransactionId oldestXact);
47 48 49

/* XLOG stuff */
#define CLOG_ZEROPAGE		0x00
50
#define CLOG_TRUNCATE		0x10
51 52

extern void clog_redo(XLogRecPtr lsn, XLogRecord *record);
53
extern void clog_desc(StringInfo buf, uint8 xl_info, char *rec);
54

55
#endif   /* CLOG_H */