src/include/storage/procarray.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * procarray.h
   4  *        POSTGRES process array definitions.
   5  *
   6  *
   7  * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
   8  * Portions Copyright (c) 1994, Regents of the University of California
   9  *
  10  * src/include/storage/procarray.h
  11  *
  12  *-------------------------------------------------------------------------
  13  */
  14 #ifndef PROCARRAY_H
  15 #define PROCARRAY_H
  16
  17 #include "storage/lock.h"
  18 #include "storage/standby.h"
  19 #include "utils/relcache.h"
  20 #include "utils/snapshot.h"
  21
  22
  23 extern Size ProcArrayShmemSize(void);
  24 extern void CreateSharedProcArray(void);
  25 extern void ProcArrayAdd(PGPROC *proc);
  26 extern void ProcArrayRemove(PGPROC *proc, TransactionId latestXid);
  27
  28 extern void ProcArrayEndTransaction(PGPROC *proc, TransactionId latestXid);
  29 extern void ProcArrayClearTransaction(PGPROC *proc);
  30
  31 extern void ProcArrayInitRecovery(TransactionId initializedUptoXID);
  32 extern void ProcArrayApplyRecoveryInfo(RunningTransactions running);
  33 extern void ProcArrayApplyXidAssignment(TransactionId topxid,
  34                                                                                 int nsubxids, TransactionId *subxids);
  35
  36 extern void RecordKnownAssignedTransactionIds(TransactionId xid);
  37 extern void ExpireTreeKnownAssignedTransactionIds(TransactionId xid,
  38                                                                                                   int nsubxids, TransactionId *subxids,
  39                                                                                                   TransactionId max_xid);
  40 extern void ExpireAllKnownAssignedTransactionIds(void);
  41 extern void ExpireOldKnownAssignedTransactionIds(TransactionId xid);
  42
  43 extern int      GetMaxSnapshotXidCount(void);
  44 extern int      GetMaxSnapshotSubxidCount(void);
  45
  46 extern Snapshot GetSnapshotData(Snapshot snapshot);
  47
  48 extern bool ProcArrayInstallImportedXmin(TransactionId xmin,
  49                                                                                  VirtualTransactionId *sourcevxid);
  50 extern bool ProcArrayInstallRestoredXmin(TransactionId xmin, PGPROC *proc);
  51
  52 extern RunningTransactions GetRunningTransactionData(void);
  53
  54 extern bool TransactionIdIsInProgress(TransactionId xid);
  55 extern bool TransactionIdIsActive(TransactionId xid);
  56 extern TransactionId GetOldestNonRemovableTransactionId(Relation rel);
  57 extern TransactionId GetOldestTransactionIdConsideredRunning(void);
  58 extern TransactionId GetOldestActiveTransactionId(void);
  59 extern TransactionId GetOldestSafeDecodingTransactionId(bool catalogOnly);
  60 extern void GetReplicationHorizons(TransactionId *slot_xmin, TransactionId *catalog_xmin);
  61
  62 extern VirtualTransactionId *GetVirtualXIDsDelayingChkpt(int *nvxids);
  63 extern bool HaveVirtualXIDsDelayingChkpt(VirtualTransactionId *vxids, int nvxids);
  64
  65 extern PGPROC *BackendPidGetProc(int pid);
  66 extern PGPROC *BackendPidGetProcWithLock(int pid);
  67 extern int      BackendXidGetPid(TransactionId xid);
  68 extern bool IsBackendPid(int pid);
  69
  70 extern VirtualTransactionId *GetCurrentVirtualXIDs(TransactionId limitXmin,
  71                                                                                                    bool excludeXmin0, bool allDbs, int excludeVacuum,
  72                                                                                                    int *nvxids);
  73 extern VirtualTransactionId *GetConflictingVirtualXIDs(TransactionId limitXmin, Oid dbOid);
  74 extern pid_t CancelVirtualTransaction(VirtualTransactionId vxid, ProcSignalReason sigmode);
  75 extern pid_t SignalVirtualTransaction(VirtualTransactionId vxid, ProcSignalReason sigmode,
  76                                                                           bool conflictPending);
  77
  78 extern bool MinimumActiveBackends(int min);
  79 extern int      CountDBBackends(Oid databaseid);
  80 extern int      CountDBConnections(Oid databaseid);
  81 extern void CancelDBBackends(Oid databaseid, ProcSignalReason sigmode, bool conflictPending);
  82 extern int      CountUserBackends(Oid roleid);
  83 extern bool CountOtherDBBackends(Oid databaseId,
  84                                                                  int *nbackends, int *nprepared);
  85 extern void TerminateOtherDBBackends(Oid databaseId);
  86
  87 extern void XidCacheRemoveRunningXids(TransactionId xid,
  88                                                                           int nxids, const TransactionId *xids,
  89                                                                           TransactionId latestXid);
  90
  91 extern void ProcArraySetReplicationSlotXmin(TransactionId xmin,
  92                                                                                         TransactionId catalog_xmin, bool already_locked);
  93
  94 extern void ProcArrayGetReplicationSlotXmin(TransactionId *xmin,
  95                                                                                         TransactionId *catalog_xmin);
  96
  97 #endif                                                  /* PROCARRAY_H */