/*-------------------------------------------------------------------------
 *
 * procarray.h
 *	  POSTGRES process array definitions.
 *
 *
 * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * $PostgreSQL: pgsql/src/include/storage/procarray.h,v 1.24 2009/01/01 17:24:01 momjian Exp $
 *
 *-------------------------------------------------------------------------
 */
#ifndef PROCARRAY_H
#define PROCARRAY_H

#include "storage/lock.h"
#include "utils/snapshot.h"


extern Size ProcArrayShmemSize(void);
extern void CreateSharedProcArray(void);
extern void ProcArrayAdd(PGPROC *proc);
extern void ProcArrayRemove(PGPROC *proc, TransactionId latestXid);

extern void ProcArrayEndTransaction(PGPROC *proc, TransactionId latestXid);
extern void ProcArrayClearTransaction(PGPROC *proc);

extern Snapshot GetSnapshotData(Snapshot snapshot);

extern bool TransactionIdIsInProgress(TransactionId xid);
extern bool TransactionIdIsActive(TransactionId xid);
extern TransactionId GetOldestXmin(bool allDbs, bool ignoreVacuum);

extern int	GetTransactionsInCommit(TransactionId **xids_p);
extern bool HaveTransactionsInCommit(TransactionId *xids, int nxids);

extern PGPROC *BackendPidGetProc(int pid);
extern int	BackendXidGetPid(TransactionId xid);
extern bool IsBackendPid(int pid);

extern VirtualTransactionId *GetCurrentVirtualXIDs(TransactionId limitXmin,
					  bool allDbs, int excludeVacuum);
extern int	CountActiveBackends(void);
extern int	CountDBBackends(Oid databaseid);
extern int	CountUserBackends(Oid roleid);
extern bool CountOtherDBBackends(Oid databaseId,
								 int *nbackends, int *nprepared);

extern void XidCacheRemoveRunningXids(TransactionId xid,
						  int nxids, const TransactionId *xids,
						  TransactionId latestXid);

#endif   /* PROCARRAY_H */
