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b9f3a929ee
validity checking rules for VACUUM. Make some other rearrangements of the VACUUM code to allow more code to be shared between full and lazy VACUUM. Minor code cleanups and added comments for TransactionId manipulations.
114 lines
3.4 KiB
C
114 lines
3.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* tqual.h
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* POSTGRES "time" qualification definitions.
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*
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* Should be moved/renamed... - vadim 07/28/98
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*
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* Portions Copyright (c) 1996-2001, 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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* $Id: tqual.h,v 1.32 2001/07/12 04:11:13 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef TQUAL_H
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#define TQUAL_H
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#include "access/htup.h"
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#include "access/xact.h"
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typedef struct SnapshotData
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{
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TransactionId xmin; /* XID < xmin are visible to me */
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TransactionId xmax; /* XID >= xmax are invisible to me */
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uint32 xcnt; /* # of xact ids in xip[] */
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TransactionId *xip; /* array of xact IDs in progress */
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/* note: all ids in xip[] satisfy xmin <= xip[i] < xmax */
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ItemPointerData tid; /* required for Dirty snapshot -:( */
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} SnapshotData;
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typedef SnapshotData *Snapshot;
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#define SnapshotNow ((Snapshot) 0x0)
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#define SnapshotSelf ((Snapshot) 0x1)
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#define SnapshotAny ((Snapshot) 0x2)
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extern DLLIMPORT Snapshot SnapshotDirty;
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extern DLLIMPORT Snapshot QuerySnapshot;
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extern DLLIMPORT Snapshot SerializableSnapshot;
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extern bool ReferentialIntegritySnapshotOverride;
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#define IsSnapshotNow(snapshot) ((Snapshot) (snapshot) == SnapshotNow)
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#define IsSnapshotSelf(snapshot) ((Snapshot) (snapshot) == SnapshotSelf)
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#define IsSnapshotAny(snapshot) ((Snapshot) (snapshot) == SnapshotAny)
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#define IsSnapshotDirty(snapshot) ((Snapshot) (snapshot) == SnapshotDirty)
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/*
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* HeapTupleSatisfiesVisibility
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* True iff heap tuple satsifies a time qual.
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*
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* Notes:
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* Assumes heap tuple is valid.
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* Beware of multiple evaluations of arguments.
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*/
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#define HeapTupleSatisfiesVisibility(tuple, snapshot) \
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( \
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TransactionIdEquals((tuple)->t_data->t_xmax, AmiTransactionId) ? \
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false \
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: \
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( \
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IsSnapshotAny(snapshot) ? \
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true \
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: \
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(IsSnapshotSelf(snapshot) ? \
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HeapTupleSatisfiesItself((tuple)->t_data) \
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: \
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(IsSnapshotNow(snapshot) ? \
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HeapTupleSatisfiesNow((tuple)->t_data) \
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: \
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(IsSnapshotDirty(snapshot) ? \
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HeapTupleSatisfiesDirty((tuple)->t_data) \
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: \
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HeapTupleSatisfiesSnapshot((tuple)->t_data, snapshot) \
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) \
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) \
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) \
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) \
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)
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/* Result codes for HeapTupleSatisfiesUpdate */
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#define HeapTupleMayBeUpdated 0
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#define HeapTupleInvisible 1
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#define HeapTupleSelfUpdated 2
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#define HeapTupleUpdated 3
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#define HeapTupleBeingUpdated 4
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/* Result codes for HeapTupleSatisfiesVacuum */
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typedef enum
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{
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HEAPTUPLE_DEAD, /* tuple is dead and deletable */
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HEAPTUPLE_LIVE, /* tuple is live (committed, no deleter) */
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HEAPTUPLE_RECENTLY_DEAD, /* tuple is dead, but not deletable yet */
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HEAPTUPLE_INSERT_IN_PROGRESS, /* inserting xact is still in progress */
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HEAPTUPLE_DELETE_IN_PROGRESS /* deleting xact is still in progress */
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} HTSV_Result;
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extern bool HeapTupleSatisfiesItself(HeapTupleHeader tuple);
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extern bool HeapTupleSatisfiesNow(HeapTupleHeader tuple);
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extern bool HeapTupleSatisfiesDirty(HeapTupleHeader tuple);
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extern bool HeapTupleSatisfiesSnapshot(HeapTupleHeader tuple,
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Snapshot snapshot);
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extern int HeapTupleSatisfiesUpdate(HeapTuple tuple);
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extern HTSV_Result HeapTupleSatisfiesVacuum(HeapTupleHeader tuple,
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TransactionId XmaxRecent);
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extern Snapshot GetSnapshotData(bool serializable);
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extern void SetQuerySnapshot(void);
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extern void FreeXactSnapshot(void);
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#endif /* TQUAL_H */
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