65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/*
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* clog.h
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*
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* PostgreSQL transaction-commit-log manager
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*
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* Portions Copyright (c) 1996-2020, 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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* src/include/access/clog.h
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*/
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#ifndef CLOG_H
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#define CLOG_H
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#include "access/xlogreader.h"
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#include "storage/sync.h"
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#include "lib/stringinfo.h"
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/*
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* Possible transaction statuses --- note that all-zeroes is the initial
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* state.
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*
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* A "subcommitted" transaction is a committed subtransaction whose parent
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* hasn't committed or aborted yet.
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*/
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typedef int XidStatus;
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#define TRANSACTION_STATUS_IN_PROGRESS 0x00
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#define TRANSACTION_STATUS_COMMITTED 0x01
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#define TRANSACTION_STATUS_ABORTED 0x02
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#define TRANSACTION_STATUS_SUB_COMMITTED 0x03
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typedef struct xl_clog_truncate
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{
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int pageno;
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TransactionId oldestXact;
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Oid oldestXactDb;
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} xl_clog_truncate;
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extern void TransactionIdSetTreeStatus(TransactionId xid, int nsubxids,
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TransactionId *subxids, XidStatus status, XLogRecPtr lsn);
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extern XidStatus TransactionIdGetStatus(TransactionId xid, XLogRecPtr *lsn);
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extern Size CLOGShmemBuffers(void);
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extern Size CLOGShmemSize(void);
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extern void CLOGShmemInit(void);
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extern void BootStrapCLOG(void);
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extern void StartupCLOG(void);
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extern void TrimCLOG(void);
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extern void ShutdownCLOG(void);
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extern void CheckPointCLOG(void);
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extern void ExtendCLOG(TransactionId newestXact);
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extern void TruncateCLOG(TransactionId oldestXact, Oid oldestxid_datoid);
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extern int clogsyncfiletag(const FileTag *ftag, char *path);
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/* XLOG stuff */
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#define CLOG_ZEROPAGE 0x00
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#define CLOG_TRUNCATE 0x10
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extern void clog_redo(XLogReaderState *record);
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extern void clog_desc(StringInfo buf, XLogReaderState *record);
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extern const char *clog_identify(uint8 info);
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#endif /* CLOG_H */
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