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/*-------------------------------------------------------------------------
*
* snapmgr.h
* POSTGRES snapshot manager
*
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/snapmgr.h,v 1.5 2009/06/11 14:49:13 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef SNAPMGR_H
#define SNAPMGR_H
#include "utils/resowner.h"
#include "utils/snapshot.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 PushUpdatedSnapshot(Snapshot snapshot);
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 AtEarlyCommit_Snapshot(void);
extern void AtEOXact_Snapshot(bool isCommit);
#endif /* SNAPMGR_H */
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