71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
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/*
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*
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* xlog.h
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*
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* Postgres transaction log manager
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*
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*/
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#ifndef XLOG_H
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#define XLOG_H
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#include "access/rmgr.h"
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#include "access/transam.h"
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typedef struct XLogRecPtr
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{
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uint32 xlogid; /* log file #, 0 based */
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uint32 xrecoff; /* offset of record in log file */
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} XLogRecPtr;
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typedef struct XLogRecord
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{
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XLogRecPtr xl_prev; /* ptr to previous record in log */
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XLogRecPtr xl_xact_prev; /* ptr to previous record of this xact */
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TransactionId xl_xid; /* xact id */
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uint16 xl_len; /* len of record on this page */
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uint8 xl_info;
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RmgrId xl_rmid; /* resource manager inserted this record */
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/* ACTUAL LOG DATA FOLLOWS AT END OF STRUCT */
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} XLogRecord;
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#define SizeOfXLogRecord DOUBLEALIGN(sizeof(XLogRecord))
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#define MAXLOGRECSZ (2 * BLCKSZ)
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/*
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* When there is no space on current page we continue on the next
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* page with subrecord.
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*/
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typedef struct XLogSubRecord
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{
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uint16 xl_len;
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uint8 xl_info;
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/* ACTUAL LOG DATA FOLLOWS AT END OF STRUCT */
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} XLogSubRecord;
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#define SizeOfXLogSubRecord DOUBLEALIGN(sizeof(XLogSubRecord))
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#define XLR_TO_BE_CONTINUED 0x01
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#define XLOG_PAGE_MAGIC 0x17345168
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typedef struct XLogPageHeaderData
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{
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uint32 xlp_magic;
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uint16 xlp_info;
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} XLogPageHeaderData;
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#define SizeOfXLogPHD DOUBLEALIGN(sizeof(XLogPageHeaderData))
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typedef XLogPageHeaderData *XLogPageHeader;
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#define XLP_FIRST_IS_SUBRECORD 0x0001
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extern XLogRecPtr XLogInsert(RmgrId rmid, char *hdr, uint32 hdrlen,
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char *buf, uint32 buflen);
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extern void XLogFlush(XLogRecPtr RecPtr);
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#endif /* XLOG_H */
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