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pg_include/utils/snapmgr.h

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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 */