procarray.h

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/*-------------------------------------------------------------------------
 *
 * procarray.h
 *    POSTGRES process array definitions.
 *
 *
 * Portions Copyright (c) 1996-2025, 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/lock.h"
#include "storage/standby.h"
#include "utils/relcache.h"
#include "utils/snapshot.h"
 
 
extern Size ProcArrayShmemSize(void);
extern void ProcArrayShmemInit(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 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 void KnownAssignedTransactionIdsIdleMaintenance(void);
 
extern int  GetMaxSnapshotXidCount(void);
extern int  GetMaxSnapshotSubxidCount(void);
 
extern Snapshot GetSnapshotData(Snapshot snapshot);
 
extern bool ProcArrayInstallImportedXmin(TransactionId xmin,
                                         VirtualTransactionId *sourcevxid);
extern bool ProcArrayInstallRestoredXmin(TransactionId xmin, PGPROC *proc);
 
extern RunningTransactions GetRunningTransactionData(void);
 
extern bool TransactionIdIsInProgress(TransactionId xid);
extern bool TransactionIdIsActive(TransactionId xid);
extern TransactionId GetOldestNonRemovableTransactionId(Relation rel);
extern TransactionId GetOldestTransactionIdConsideredRunning(void);
extern TransactionId GetOldestActiveTransactionId(void);
extern TransactionId GetOldestSafeDecodingTransactionId(bool catalogOnly);
extern void GetReplicationHorizons(TransactionId *xmin, TransactionId *catalog_xmin);
 
extern VirtualTransactionId *GetVirtualXIDsDelayingChkpt(int *nvxids, int type);
extern bool HaveVirtualXIDsDelayingChkpt(VirtualTransactionId *vxids,
                                         int nvxids, int type);
 
extern PGPROC *ProcNumberGetProc(int procNumber);
extern void ProcNumberGetTransactionIds(int procNumber, TransactionId *xid,
                                        TransactionId *xmin, int *nsubxid,
                                        bool *overflowed);
extern PGPROC *BackendPidGetProc(int pid);
extern PGPROC *BackendPidGetProcWithLock(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 pid_t SignalVirtualTransaction(VirtualTransactionId vxid, ProcSignalReason sigmode,
                                      bool conflictPending);
 
extern bool MinimumActiveBackends(int min);
extern int  CountDBBackends(Oid databaseid);
extern int  CountDBConnections(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 void TerminateOtherDBBackends(Oid databaseId);
 
extern void XidCacheRemoveRunningXids(TransactionId xid,
                                      int nxids, const TransactionId *xids,
                                      TransactionId latestXid);
 
extern void ProcArraySetReplicationSlotXmin(TransactionId xmin,
                                            TransactionId catalog_xmin, bool already_locked);
 
extern void ProcArrayGetReplicationSlotXmin(TransactionId *xmin,
                                            TransactionId *catalog_xmin);
 
#endif                          /* PROCARRAY_H */