greenplumn clog 源码
greenplumn clog 代码
文件路径：/src/include/access/clog.h
/*
* clog.h
*
* PostgreSQL transaction-commit-log manager
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/access/clog.h
*/
#ifndef CLOG_H
#define CLOG_H
#include "access/xlogreader.h"
#include "lib/stringinfo.h"
/*
* Possible transaction statuses --- note that all-zeroes is the initial
* state.
*
* A "subcommitted" transaction is a committed subtransaction whose parent
* hasn't committed or aborted yet.
*/
typedef int XidStatus;
#define TRANSACTION_STATUS_IN_PROGRESS 0x00
#define TRANSACTION_STATUS_COMMITTED 0x01
#define TRANSACTION_STATUS_ABORTED 0x02
#define TRANSACTION_STATUS_SUB_COMMITTED 0x03
typedef struct xl_clog_truncate
{
int pageno;
TransactionId oldestXact;
Oid oldestXactDb;
} xl_clog_truncate;
extern void TransactionIdSetTreeStatus(TransactionId xid, int nsubxids,
TransactionId *subxids, XidStatus status, XLogRecPtr lsn);
extern XidStatus TransactionIdGetStatus(TransactionId xid, XLogRecPtr *lsn);
extern Size CLOGShmemBuffers(void);
extern Size CLOGShmemSize(void);
extern void CLOGShmemInit(void);
extern void BootStrapCLOG(void);
extern void StartupCLOG(void);
extern void TrimCLOG(void);
extern void ShutdownCLOG(void);
extern void CheckPointCLOG(void);
extern void ExtendCLOG(TransactionId newestXact);
extern void TruncateCLOG(TransactionId oldestXact, Oid oldestxid_datoid);
extern bool CLOGScanForPrevStatus(
TransactionId *indexXid,
XidStatus *status);
extern bool CLOGTransactionIsOld(TransactionId xid);
/* XLOG stuff */
#define CLOG_ZEROPAGE 0x00
#define CLOG_TRUNCATE 0x10
extern void clog_redo(XLogReaderState *record);
extern void clog_desc(StringInfo buf, XLogReaderState *record);
extern const char *clog_identify(uint8 info);
#endif /* CLOG_H */
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