9ffc8ed58b
http://archives.postgresql.org/pgsql-hackers/2004-10/msg00464.php. This fix is intended to be permanent: it moves the responsibility for calling SetBufferCommitInfoNeedsSave() into the tqual.c routines, eliminating the requirement for callers to test whether t_infomask changed. Also, tighten validity checking on buffer IDs in bufmgr.c --- several routines were paranoid about out-of-range shared buffer numbers but not about out-of-range local ones, which seems a tad pointless.
102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
/*-------------------------------------------------------------------------
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*
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* valid.h
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* POSTGRES tuple qualification validity definitions.
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*
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*
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* Portions Copyright (c) 1996-2004, 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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* $PostgreSQL: pgsql/src/include/access/valid.h,v 1.35 2004/10/15 22:40:21 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef VALID_H
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#define VALID_H
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/*
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* HeapKeyTest
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*
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* Test a heap tuple to see if it satisfies a scan key.
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*/
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#define HeapKeyTest(tuple, \
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tupdesc, \
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nkeys, \
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keys, \
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result) \
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do \
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{ \
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/* Use underscores to protect the variables passed in as parameters */ \
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int __cur_nkeys = (nkeys); \
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ScanKey __cur_keys = (keys); \
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\
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(result) = true; /* may change */ \
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for (; __cur_nkeys--; __cur_keys++) \
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{ \
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Datum __atp; \
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bool __isnull; \
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Datum __test; \
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\
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if (__cur_keys->sk_flags & SK_ISNULL) \
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{ \
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(result) = false; \
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break; \
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} \
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\
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__atp = heap_getattr((tuple), \
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__cur_keys->sk_attno, \
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(tupdesc), \
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&__isnull); \
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\
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if (__isnull) \
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{ \
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(result) = false; \
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break; \
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} \
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\
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__test = FunctionCall2(&__cur_keys->sk_func, \
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__atp, __cur_keys->sk_argument); \
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\
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if (!DatumGetBool(__test)) \
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{ \
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(result) = false; \
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break; \
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} \
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} \
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} while (0)
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/*
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* HeapTupleSatisfies
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*
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* res is set TRUE if the HeapTuple satisfies the timequal and keytest,
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* otherwise it is set FALSE. Note that the hint bits in the HeapTuple's
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* t_infomask may be updated as a side effect.
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*
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* on 8/21/92 mao says: i rearranged the tests here to do keytest before
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* SatisfiesTimeQual. profiling indicated that even for vacuumed relations,
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* time qual checking was more expensive than key testing. time qual is
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* least likely to fail, too. we should really add the time qual test to
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* the restriction and optimize it in the normal way. this has interactions
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* with joey's expensive function work.
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*/
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#define HeapTupleSatisfies(tuple, \
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relation, \
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buffer, \
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disk_page, \
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snapshot, \
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nKeys, \
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key, \
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res) \
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do \
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{ \
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if ((key) != NULL) \
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HeapKeyTest(tuple, RelationGetDescr(relation), nKeys, key, res); \
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else \
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(res) = true; \
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\
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if ((res) && (relation)->rd_rel->relkind != RELKIND_UNCATALOGED) \
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(res) = HeapTupleSatisfiesVisibility(tuple, snapshot, buffer); \
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} while (0)
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#endif /* VALID_H */
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