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/* * timeline.h * * Functions for reading and writing timeline history files. * * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/access/timeline.h */ #ifndef TIMELINE_H #define TIMELINE_H #include "access/xlogdefs.h" #include "nodes/pg_list.h" /* * A list of these structs describes the timeline history of the server. Each * TimeLineHistoryEntry represents a piece of WAL belonging to the history, * from newest to oldest. All WAL positions between 'begin' and 'end' belong to * the timeline represented by the entry. Together the 'begin' and 'end' * pointers of all the entries form a contiguous line from beginning of time * to infinity. */ typedef struct { TimeLineID tli; XLogRecPtr begin; /* inclusive */ XLogRecPtr end; /* exclusive, InvalidXLogRecPtr means infinity */ } TimeLineHistoryEntry; extern List *readTimeLineHistory(TimeLineID targetTLI); extern bool existsTimeLineHistory(TimeLineID probeTLI); extern TimeLineID findNewestTimeLine(TimeLineID startTLI); extern void writeTimeLineHistory(TimeLineID newTLI, TimeLineID parentTLI, XLogRecPtr switchpoint, char *reason); extern void writeTimeLineHistoryFile(TimeLineID tli, char *content, int size); extern void restoreTimeLineHistoryFiles(TimeLineID begin, TimeLineID end); extern bool tliInHistory(TimeLineID tli, List *expectedTLIs); extern TimeLineID tliOfPointInHistory(XLogRecPtr ptr, List *history); extern XLogRecPtr tliSwitchPoint(TimeLineID tli, List *history, TimeLineID *nextTLI); #endif /* TIMELINE_H */