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45 lines
1.6 KiB
C
45 lines
1.6 KiB
C
/*
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* timeline.h
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*
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* Functions for reading and writing timeline history files.
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*
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* Portions Copyright (c) 1996-2015, 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/timeline.h
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*/
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#ifndef TIMELINE_H
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#define TIMELINE_H
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#include "access/xlogdefs.h"
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#include "nodes/pg_list.h"
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/*
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* A list of these structs describes the timeline history of the server. Each
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* TimeLineHistoryEntry represents a piece of WAL belonging to the history,
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* from newest to oldest. All WAL positions between 'begin' and 'end' belong to
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* the timeline represented by the entry. Together the 'begin' and 'end'
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* pointers of all the entries form a contiguous line from beginning of time
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* to infinity.
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*/
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typedef struct
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{
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TimeLineID tli;
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XLogRecPtr begin; /* inclusive */
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XLogRecPtr end; /* exclusive, 0 means infinity */
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} TimeLineHistoryEntry;
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extern List *readTimeLineHistory(TimeLineID targetTLI);
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extern bool existsTimeLineHistory(TimeLineID probeTLI);
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extern TimeLineID findNewestTimeLine(TimeLineID startTLI);
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extern void writeTimeLineHistory(TimeLineID newTLI, TimeLineID parentTLI,
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XLogRecPtr switchpoint, char *reason);
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extern void writeTimeLineHistoryFile(TimeLineID tli, char *content, int size);
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extern void restoreTimeLineHistoryFiles(TimeLineID begin, TimeLineID end);
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extern bool tliInHistory(TimeLineID tli, List *expectedTLIs);
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extern TimeLineID tliOfPointInHistory(XLogRecPtr ptr, List *history);
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extern XLogRecPtr tliSwitchPoint(TimeLineID tli, List *history,
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TimeLineID *nextTLI);
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#endif /* TIMELINE_H */
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