diff options
Diffstat (limited to 'src/include')
| -rw-r--r-- | src/include/access/timeline.h | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/src/include/access/timeline.h b/src/include/access/timeline.h index f2a7658bc45..785195bd36a 100644 --- a/src/include/access/timeline.h +++ b/src/include/access/timeline.h @@ -14,10 +14,28 @@ #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, 0 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, - TimeLineID endTLI, XLogSegNo endLogSegNo, char *reason); + XLogRecPtr switchpoint, char *reason); +extern bool tliInHistory(TimeLineID tli, List *expectedTLIs); +extern TimeLineID tliOfPointInHistory(XLogRecPtr ptr, List *history); +extern XLogRecPtr tliSwitchPoint(TimeLineID tli, List *history); #endif /* TIMELINE_H */ |