commit_ts.h

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/*
 * commit_ts.h
 *
 * PostgreSQL commit timestamp manager
 *
 * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/access/commit_ts.h
 */
#ifndef COMMIT_TS_H
#define COMMIT_TS_H
 
#include "access/xlog.h"
#include "datatype/timestamp.h"
#include "replication/origin.h"
#include "storage/sync.h"
 
 
extern PGDLLIMPORT bool track_commit_timestamp;
 
extern void TransactionTreeSetCommitTsData(TransactionId xid, int nsubxids,
                                           TransactionId *subxids, TimestampTz timestamp,
                                           ReplOriginId nodeid);
extern bool TransactionIdGetCommitTsData(TransactionId xid,
                                         TimestampTz *ts, ReplOriginId *nodeid);
extern TransactionId GetLatestCommitTsData(TimestampTz *ts,
                                           ReplOriginId *nodeid);
 
extern Size CommitTsShmemSize(void);
extern void CommitTsShmemInit(void);
extern void BootStrapCommitTs(void);
extern void StartupCommitTs(void);
extern void CommitTsParameterChange(bool newvalue, bool oldvalue);
extern void CompleteCommitTsInitialization(void);
extern void CheckPointCommitTs(void);
extern void ExtendCommitTs(TransactionId newestXact);
extern void TruncateCommitTs(TransactionId oldestXact);
extern void SetCommitTsLimit(TransactionId oldestXact,
                             TransactionId newestXact);
extern void AdvanceOldestCommitTsXid(TransactionId oldestXact);
 
extern int  committssyncfiletag(const FileTag *ftag, char *path);
 
/* XLOG stuff */
#define COMMIT_TS_ZEROPAGE      0x00
#define COMMIT_TS_TRUNCATE      0x10
 
typedef struct xl_commit_ts_truncate
{
    int64       pageno;
    TransactionId oldestXid;
} xl_commit_ts_truncate;
 
#define SizeOfCommitTsTruncate  (offsetof(xl_commit_ts_truncate, oldestXid) + \
                                 sizeof(TransactionId))
 
extern void commit_ts_redo(XLogReaderState *record);
extern void commit_ts_desc(StringInfo buf, XLogReaderState *record);
extern const char *commit_ts_identify(uint8 info);
 
#endif                          /* COMMIT_TS_H */