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//usr/include/pgsql/server/utils/snapmgr.h

/*-------------------------------------------------------------------------
 *
 * 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 */