src/include/storage/procarray.h

/*-------------------------------------------------------------------------
 *
 * procarray.h
 *	  POSTGRES process array definitions.
 *
 *
 * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * $PostgreSQL: pgsql/src/include/storage/procarray.h,v 1.10 2006/07/30 02:07:18 alvherre Exp $
 *
 *-------------------------------------------------------------------------
 */
#ifndef PROCARRAY_H
#define PROCARRAY_H

#include "storage/lock.h"

struct DtxContextInfo;         /* cdb/cdbdtxcontextinfo.h */
struct SnapshotData;           /* utils/tqual.h */

extern Size ProcArrayShmemSize(void);
extern void CreateSharedProcArray(void);
extern void ProcArrayAdd(PGPROC *proc);
extern void ProcArrayRemove(PGPROC *proc, bool isCommit);

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

extern PGPROC *BackendPidGetProc(int pid);
extern int	BackendXidGetPid(TransactionId xid);
extern bool IsBackendPid(int pid);
extern bool DatabaseHasActiveBackends(Oid databaseId, bool ignoreMyself);

extern int	CountActiveBackends(void);
extern int	CountDBBackends(Oid databaseid);
extern int	CountUserBackends(Oid roleid);

extern void XidCacheRemoveRunningXids(TransactionId xid,
						  int nxids, TransactionId *xids);
						  
extern struct SnapshotData* GetSnapshotData(struct SnapshotData *snapshot, bool serializable);
extern void updateSharedLocalSnapshot(struct DtxContextInfo *dtxContextInfo, struct SnapshotData *snapshot, char* debugCaller);

extern void GetSlotTableDebugInfo(void **snapshotArray, int *maxSlots);

extern bool FindAndSignalProcess(int sessionId, int commandId);

#endif   /* PROCARRAY_H */