/*
 * subtrans.h
 *
 * PostgreSQL subtrans-log manager
 *
 * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * $PostgreSQL$
 */
#ifndef SUBTRANS_H
#define SUBTRANS_H

#include "access/xlog.h"

/* exported because lwlock.c needs it */
#define NUM_SUBTRANS_BUFFERS	8


extern void SubTransSetParent(TransactionId xid, TransactionId parent);
extern TransactionId SubTransGetParent(TransactionId xid);

extern int	SubTransShmemSize(void);
extern void SubTransShmemInit(void);
extern void BootStrapSubTrans(void);
extern void StartupSubTrans(void);
extern void ShutdownSubTrans(void);
extern void CheckPointSubTrans(void);
extern void ExtendSubTrans(TransactionId newestXact);
extern void TruncateSubTrans(TransactionId oldestXact);

/* XLOG stuff */
#define SUBTRANS_ZEROPAGE		0x00

extern void subtrans_redo(XLogRecPtr lsn, XLogRecord *record);
extern void subtrans_undo(XLogRecPtr lsn, XLogRecord *record);
extern void subtrans_desc(char *buf, uint8 xl_info, char *rec);

#endif   /* SUBTRANS_H */