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pg_include/storage/predicate.h

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+/*-------------------------------------------------------------------------
+ *
+ * predicate.h
+ *	  POSTGRES public predicate locking definitions.
+ *
+ *
+ * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/storage/predicate.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PREDICATE_H
+#define PREDICATE_H
+
+#include "utils/relcache.h"
+#include "utils/snapshot.h"
+
+
+/*
+ * GUC variables
+ */
+extern int	max_predicate_locks_per_xact;
+
+
+/* Number of SLRU buffers to use for predicate locking */
+#define NUM_OLDSERXID_BUFFERS	16
+
+
+/*
+ * function prototypes
+ */
+
+/* housekeeping for shared memory predicate lock structures */
+extern void InitPredicateLocks(void);
+extern Size PredicateLockShmemSize(void);
+
+extern void CheckPointPredicate(void);
+
+/* predicate lock reporting */
+extern bool PageIsPredicateLocked(Relation relation, BlockNumber blkno);
+
+/* predicate lock maintenance */
+extern Snapshot GetSerializableTransactionSnapshot(Snapshot snapshot);
+extern void SetSerializableTransactionSnapshot(Snapshot snapshot,
+								   TransactionId sourcexid);
+extern void RegisterPredicateLockingXid(TransactionId xid);
+extern void PredicateLockRelation(Relation relation, Snapshot snapshot);
+extern void PredicateLockPage(Relation relation, BlockNumber blkno, Snapshot snapshot);
+extern void PredicateLockTuple(Relation relation, HeapTuple tuple, Snapshot snapshot);
+extern void PredicateLockPageSplit(Relation relation, BlockNumber oldblkno, BlockNumber newblkno);
+extern void PredicateLockPageCombine(Relation relation, BlockNumber oldblkno, BlockNumber newblkno);
+extern void TransferPredicateLocksToHeapRelation(Relation relation);
+extern void ReleasePredicateLocks(bool isCommit);
+
+/* conflict detection (may also trigger rollback) */
+extern void CheckForSerializableConflictOut(bool valid, Relation relation, HeapTuple tuple,
+								Buffer buffer, Snapshot snapshot);
+extern void CheckForSerializableConflictIn(Relation relation, HeapTuple tuple, Buffer buffer);
+extern void CheckTableForSerializableConflictIn(Relation relation);
+
+/* final rollback checking */
+extern void PreCommit_CheckForSerializationFailure(void);
+
+/* two-phase commit support */
+extern void AtPrepare_PredicateLocks(void);
+extern void PostPrepare_PredicateLocks(TransactionId xid);
+extern void PredicateLockTwoPhaseFinish(TransactionId xid, bool isCommit);
+extern void predicatelock_twophase_recover(TransactionId xid, uint16 info,
+							   void *recdata, uint32 len);
+
+#endif   /* PREDICATE_H */