1 files changed, 130 insertions, 0 deletions
diff --git a/src/include/storage/procarray.h b/src/include/storage/procarray.h
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+++ b/src/include/storage/procarray.h
@@ -0,0 +1,130 @@
+/*-------------------------------------------------------------------------
+ *
+ * procarray.h
+ *	  POSTGRES process array definitions.
+ *
+ *
+ * Portions Copyright (c) 1996-2020, 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"
+
+
+/*
+ * These are to implement PROCARRAY_FLAGS_XXX
+ *
+ * Note: These flags are cloned from PROC_XXX flags in src/include/storage/proc.h
+ * to avoid forcing to include proc.h when including procarray.h. So if you modify
+ * PROC_XXX flags, you need to modify these flags.
+ */
+#define		PROCARRAY_VACUUM_FLAG			0x02	/* currently running lazy
+													 * vacuum */
+#define		PROCARRAY_ANALYZE_FLAG			0x04	/* currently running
+													 * analyze */
+#define		PROCARRAY_LOGICAL_DECODING_FLAG 0x10	/* currently doing logical
+													 * decoding outside xact */
+
+#define		PROCARRAY_SLOTS_XMIN			0x20	/* replication slot xmin,
+													 * catalog_xmin */
+/*
+ * Only flags in PROCARRAY_PROC_FLAGS_MASK are considered when matching
+ * PGXACT->vacuumFlags. Other flags are used for different purposes and
+ * have no corresponding PROC flag equivalent.
+ */
+#define		PROCARRAY_PROC_FLAGS_MASK	(PROCARRAY_VACUUM_FLAG | \
+										 PROCARRAY_ANALYZE_FLAG | \
+										 PROCARRAY_LOGICAL_DECODING_FLAG)
+
+/* Use the following flags as an input "flags" to GetOldestXmin function */
+/* Consider all backends except for logical decoding ones which manage xmin separately */
+#define		PROCARRAY_FLAGS_DEFAULT			PROCARRAY_LOGICAL_DECODING_FLAG
+/* Ignore vacuum backends */
+#define		PROCARRAY_FLAGS_VACUUM			PROCARRAY_FLAGS_DEFAULT | PROCARRAY_VACUUM_FLAG
+/* Ignore analyze backends */
+#define		PROCARRAY_FLAGS_ANALYZE			PROCARRAY_FLAGS_DEFAULT | PROCARRAY_ANALYZE_FLAG
+/* Ignore both vacuum and analyze backends */
+#define		PROCARRAY_FLAGS_VACUUM_ANALYZE	PROCARRAY_FLAGS_DEFAULT | PROCARRAY_VACUUM_FLAG | PROCARRAY_ANALYZE_FLAG
+
+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 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);
+
+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 GetOldestXmin(Relation rel, int flags);
+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 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 */