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2e0943a859
I replaced the old SimpleLruInit() function without a backwards compatibility wrapper, because few extensions define their own SLRUs. Reviewed-by: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com> Reviewed-by: Matthias van de Meent <boekewurm+postgres@gmail.com> Reviewed-by: Daniel Gustafsson <daniel@yesql.se> Discussion: https://www.postgresql.org/message-id/CAExHW5vM1bneLYfg0wGeAa=52UiJ3z4vKd3AJ72X8Fw6k3KKrg@mail.gmail.com
84 lines
3.1 KiB
C
84 lines
3.1 KiB
C
/*-------------------------------------------------------------------------
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*
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* predicate.h
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* POSTGRES public predicate locking definitions.
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*
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*
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* Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/storage/predicate.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PREDICATE_H
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#define PREDICATE_H
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#include "access/transam.h"
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#include "storage/itemptr.h"
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#include "utils/relcache.h"
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#include "utils/snapshot.h"
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/*
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* forward references in this file
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*/
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typedef struct VirtualTransactionId VirtualTransactionId;
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/*
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* GUC variables
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*/
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extern PGDLLIMPORT int max_predicate_locks_per_xact;
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extern PGDLLIMPORT int max_predicate_locks_per_relation;
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extern PGDLLIMPORT int max_predicate_locks_per_page;
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/*
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* A handle used for sharing SERIALIZABLEXACT objects between the participants
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* in a parallel query.
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*/
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typedef void *SerializableXactHandle;
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/*
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* function prototypes
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*/
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extern void CheckPointPredicate(void);
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/* predicate lock reporting */
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extern bool PageIsPredicateLocked(Relation relation, BlockNumber blkno);
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/* predicate lock maintenance */
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extern Snapshot GetSerializableTransactionSnapshot(Snapshot snapshot);
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extern void SetSerializableTransactionSnapshot(Snapshot snapshot,
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VirtualTransactionId *sourcevxid,
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int sourcepid);
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extern void RegisterPredicateLockingXid(TransactionId xid);
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extern void PredicateLockRelation(Relation relation, Snapshot snapshot);
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extern void PredicateLockPage(Relation relation, BlockNumber blkno, Snapshot snapshot);
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extern void PredicateLockTID(Relation relation, const ItemPointerData *tid, Snapshot snapshot,
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TransactionId tuple_xid);
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extern void PredicateLockPageSplit(Relation relation, BlockNumber oldblkno, BlockNumber newblkno);
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extern void PredicateLockPageCombine(Relation relation, BlockNumber oldblkno, BlockNumber newblkno);
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extern void TransferPredicateLocksToHeapRelation(Relation relation);
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extern void ReleasePredicateLocks(bool isCommit, bool isReadOnlySafe);
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/* conflict detection (may also trigger rollback) */
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extern bool CheckForSerializableConflictOutNeeded(Relation relation, Snapshot snapshot);
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extern void CheckForSerializableConflictOut(Relation relation, TransactionId xid, Snapshot snapshot);
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extern void CheckForSerializableConflictIn(Relation relation, const ItemPointerData *tid, BlockNumber blkno);
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extern void CheckTableForSerializableConflictIn(Relation relation);
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/* final rollback checking */
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extern void PreCommit_CheckForSerializationFailure(void);
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/* two-phase commit support */
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extern void AtPrepare_PredicateLocks(void);
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extern void PostPrepare_PredicateLocks(FullTransactionId fxid);
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extern void PredicateLockTwoPhaseFinish(FullTransactionId fxid, bool isCommit);
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extern void predicatelock_twophase_recover(FullTransactionId fxid, uint16 info,
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void *recdata, uint32 len);
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/* parallel query support */
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extern SerializableXactHandle ShareSerializableXact(void);
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extern void AttachSerializableXact(SerializableXactHandle handle);
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#endif /* PREDICATE_H */
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