text: /*-------------------------------------------------------------------------
   *
   * procarray.h
   *	  POSTGRES process array definitions.
   *
   *
   * Portions Copyright (c) 1996-2015, PostgreSQL Global Development Group
   * Portions Copyright (c) 1994, Regents of the University of California
   *
   * src/include/storage/procarray.h
   *
   *-------------------------------------------------------------------------
   */
  #ifndef PROCARRAY_H
  #define PROCARRAY_H
  
  #include "storage/standby.h"
  #include "utils/relcache.h"
  #include "utils/snapshot.h"
  
  #include "cdb/cdbpublic.h"
  #include "cdb/cdbtm.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, TransactionId latestXid);
  extern void ProcArrayEndTransaction(PGPROC *proc, TransactionId latestXid, bool lockHeld);
  extern void ProcArrayEndGxact(void);
  extern void ProcArrayClearTransaction(PGPROC *proc);
  
  extern void ProcArrayInitRecovery(TransactionId initializedUptoXID);
  extern void ProcArrayApplyRecoveryInfo(RunningTransactions running);
  extern void ProcArrayApplyXidAssignment(TransactionId topxid,
  							int nsubxids, TransactionId *subxids);
  
  extern void RecordKnownAssignedTransactionIds(TransactionId xid);
  extern void ExpireTreeKnownAssignedTransactionIds(TransactionId xid,
  									  int nsubxids, TransactionId *subxids,
  									  TransactionId max_xid);
  extern void ExpireAllKnownAssignedTransactionIds(void);
  extern void ExpireOldKnownAssignedTransactionIds(TransactionId xid);
  
  extern int	GetMaxSnapshotXidCount(void);
  extern int	GetMaxSnapshotSubxidCount(void);
  
  extern Snapshot GetSnapshotData(Snapshot snapshot, DtxContext distributedTransactionContext);
  
  extern bool ProcArrayInstallImportedXmin(TransactionId xmin,
  							 TransactionId sourcexid);
  extern bool ProcArrayInstallRestoredXmin(TransactionId xmin, PGPROC *proc);
  
  extern RunningTransactions GetRunningTransactionData(void);
  
  extern bool TransactionIdIsInProgress(TransactionId xid);
  extern bool TransactionIdIsActive(TransactionId xid);
  extern TransactionId GetOldestXmin(Relation rel, bool ignoreVacuum);
  extern TransactionId GetLocalOldestXmin(Relation rel, bool ignoreVacuum);
  extern TransactionId GetOldestActiveTransactionId(void);
  extern TransactionId GetOldestSafeDecodingTransactionId(bool catalogOnly);
  
  extern VirtualTransactionId *GetVirtualXIDsDelayingChkpt(int *nvxids);
  extern bool HaveVirtualXIDsDelayingChkpt(VirtualTransactionId *vxids, int nvxids);
  
  extern PGPROC *BackendPidGetProc(int pid);
  extern int	BackendXidGetPid(TransactionId xid);
  extern bool IsBackendPid(int pid);
  
  extern VirtualTransactionId *GetCurrentVirtualXIDs(TransactionId limitXmin,
  					  bool excludeXmin0, bool allDbs, int excludeVacuum,
  					  int *nvxids);
  extern VirtualTransactionId *GetConflictingVirtualXIDs(TransactionId limitXmin, Oid dbOid);
  extern pid_t CancelVirtualTransaction(VirtualTransactionId vxid, ProcSignalReason sigmode);
  
  extern bool MinimumActiveBackends(int min);
  extern int	CountDBBackends(Oid databaseid);
  extern void CancelDBBackends(Oid databaseid, ProcSignalReason sigmode, bool conflictPending);
  extern int	CountUserBackends(Oid roleid);
  extern bool CountOtherDBBackends(Oid databaseId,
  					 int *nbackends, int *nprepared);
  extern bool HasSerializableBackends(bool allDbs);
  
  extern void XidCacheRemoveRunningXids(TransactionId xid,
  						  int nxids, const TransactionId *xids,
  						  TransactionId latestXid);
  						  
  extern PGPROC *FindProcByGpSessionId(long gp_session_id);
  extern void UpdateSerializableCommandId(CommandId curcid);
  
  extern void updateSharedLocalSnapshot(struct DtxContextInfo *dtxContextInfo, DtxContext distributedTransactionContext, struct SnapshotData *snapshot, char* debugCaller);
  
  extern void GetSlotTableDebugInfo(void **snapshotArray, int *maxSlots);
  
  extern void getDtxCheckPointInfo(char **result, int *result_size);
  
  extern List *ListAllGxid(void);
  extern int GetPidByGxid(DistributedTransactionId gxid);
  
  extern void ProcArraySetReplicationSlotXmin(TransactionId xmin,
  							TransactionId catalog_xmin, bool already_locked);
  
  extern void ProcArrayGetReplicationSlotXmin(TransactionId *xmin,
  								TransactionId *catalog_xmin);
  
  #endif   /* PROCARRAY_H */
  