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/*------------------------------------------------------------------------- * * snapmgr.h * POSTGRES snapshot manager * * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/utils/snapmgr.h * *------------------------------------------------------------------------- */ #ifndef SNAPMGR_H #define SNAPMGR_H #include "utils/resowner.h" extern bool FirstSnapshotSet; extern TransactionId TransactionXmin; extern TransactionId RecentXmin; extern TransactionId RecentGlobalXmin; extern Snapshot GetTransactionSnapshot(void); extern Snapshot GetLatestSnapshot(void); extern void SnapshotSetCommandId(CommandId curcid); extern void PushActiveSnapshot(Snapshot snapshot); extern void PushCopiedSnapshot(Snapshot snapshot); extern void UpdateActiveSnapshotCommandId(void); extern void PopActiveSnapshot(void); extern Snapshot GetActiveSnapshot(void); extern bool ActiveSnapshotSet(void); extern Snapshot RegisterSnapshot(Snapshot snapshot); extern void UnregisterSnapshot(Snapshot snapshot); extern Snapshot RegisterSnapshotOnOwner(Snapshot snapshot, ResourceOwner owner); extern void UnregisterSnapshotFromOwner(Snapshot snapshot, ResourceOwner owner); extern void AtSubCommit_Snapshot(int level); extern void AtSubAbort_Snapshot(int level); extern void AtEOXact_Snapshot(bool isCommit); extern Datum pg_export_snapshot(PG_FUNCTION_ARGS); extern void ImportSnapshot(const char *idstr); extern bool XactHasExportedSnapshots(void); extern void DeleteAllExportedSnapshotFiles(void); #endif /* SNAPMGR_H */