src/include/storage/procarray.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * procarray.h
   4  *        POSTGRES process array definitions.
   5  *
   6  *
   7  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
   8  * Portions Copyright (c) 1994, Regents of the University of California
   9  *
  10  * $PostgreSQL$
  11  *
  12  *-------------------------------------------------------------------------
  13  */
  14 #ifndef PROCARRAY_H
  15 #define PROCARRAY_H
  16
  17 #include "storage/lock.h"
  18 #include "utils/snapshot.h"
  19
  20
  21 extern Size ProcArrayShmemSize(void);
  22 extern void CreateSharedProcArray(void);
  23 extern void ProcArrayAdd(PGPROC *proc);
  24 extern void ProcArrayRemove(PGPROC *proc, TransactionId latestXid);
  25
  26 extern void ProcArrayEndTransaction(PGPROC *proc, TransactionId latestXid);
  27 extern void ProcArrayClearTransaction(PGPROC *proc);
  28
  29 extern Snapshot GetSnapshotData(Snapshot snapshot);
  30
  31 extern bool TransactionIdIsInProgress(TransactionId xid);
  32 extern bool TransactionIdIsActive(TransactionId xid);
  33 extern TransactionId GetOldestXmin(bool allDbs, bool ignoreVacuum);
  34
  35 extern int      GetTransactionsInCommit(TransactionId **xids_p);
  36 extern bool HaveTransactionsInCommit(TransactionId *xids, int nxids);
  37
  38 extern PGPROC *BackendPidGetProc(int pid);
  39 extern int      BackendXidGetPid(TransactionId xid);
  40 extern bool IsBackendPid(int pid);
  41
  42 extern VirtualTransactionId *GetCurrentVirtualXIDs(TransactionId limitXmin,
  43                                           bool allDbs, int excludeVacuum);
  44 extern int      CountActiveBackends(void);
  45 extern int      CountDBBackends(Oid databaseid);
  46 extern int      CountUserBackends(Oid roleid);
  47 extern bool CountOtherDBBackends(Oid databaseId,
  48                                                                  int *nbackends, int *nprepared);
  49
  50 extern void XidCacheRemoveRunningXids(TransactionId xid,
  51                                                   int nxids, const TransactionId *xids,
  52                                                   TransactionId latestXid);
  53
  54 #endif   /* PROCARRAY_H */