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5da417f7c4
As Tom Lane pointed out, "const Relation foo" doesn't guarantee that you can't modify the data the "foo" pointer points to. It just means that you can't change the pointer to point to something else within the function, which is not very useful.
72 lines
2.5 KiB
C
72 lines
2.5 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) 1996-2011, 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 "utils/relcache.h"
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#include "utils/snapshot.h"
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/*
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* GUC variables
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*/
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extern int max_predicate_locks_per_xact;
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/* Number of SLRU buffers to use for predicate locking */
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#define NUM_OLDSERXID_BUFFERS 16
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/*
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* function prototypes
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*/
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/* housekeeping for shared memory predicate lock structures */
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extern void InitPredicateLocks(void);
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extern Size PredicateLockShmemSize(void);
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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 RegisterSerializableTransaction(Snapshot snapshot);
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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 PredicateLockTuple(Relation relation, HeapTuple tuple, Snapshot snapshot);
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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);
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/* conflict detection (may also trigger rollback) */
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extern void CheckForSerializableConflictOut(bool valid, Relation relation, HeapTuple tuple,
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Buffer buffer, Snapshot snapshot);
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extern void CheckForSerializableConflictIn(Relation relation, HeapTuple tuple, Buffer buffer);
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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(TransactionId xid);
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extern void PredicateLockTwoPhaseFinish(TransactionId xid, bool isCommit);
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extern void predicatelock_twophase_recover(TransactionId xid, uint16 info,
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void *recdata, uint32 len);
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#endif /* PREDICATE_H */
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