src/include/utils/snapmgr.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * snapmgr.h
   4  *        POSTGRES snapshot manager
   5  *
   6  * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
   7  * Portions Copyright (c) 1994, Regents of the University of California
   8  *
   9  * $PostgreSQL$
  10  *
  11  *-------------------------------------------------------------------------
  12  */
  13 #ifndef SNAPMGR_H
  14 #define SNAPMGR_H
  15
  16 #include "utils/resowner.h"
  17 #include "utils/snapshot.h"
  18
  19
  20 extern bool FirstSnapshotSet;
  21
  22 extern TransactionId TransactionXmin;
  23 extern TransactionId RecentXmin;
  24 extern TransactionId RecentGlobalXmin;
  25
  26 extern Snapshot GetTransactionSnapshot(void);
  27 extern Snapshot GetLatestSnapshot(void);
  28 extern void SnapshotSetCommandId(CommandId curcid);
  29
  30 extern void PushActiveSnapshot(Snapshot snapshot);
  31 extern void PushUpdatedSnapshot(Snapshot snapshot);
  32 extern void PopActiveSnapshot(void);
  33 extern Snapshot GetActiveSnapshot(void);
  34 extern bool ActiveSnapshotSet(void);
  35
  36 extern Snapshot RegisterSnapshot(Snapshot snapshot);
  37 extern void UnregisterSnapshot(Snapshot snapshot);
  38 extern Snapshot RegisterSnapshotOnOwner(Snapshot snapshot, ResourceOwner owner);
  39 extern void UnregisterSnapshotFromOwner(Snapshot snapshot, ResourceOwner owner);
  40
  41 extern void AtSubCommit_Snapshot(int level);
  42 extern void AtSubAbort_Snapshot(int level);
  43 extern void AtEarlyCommit_Snapshot(void);
  44 extern void AtEOXact_Snapshot(bool isCommit);
  45
  46 #endif   /* SNAPMGR_H */