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786afc1ce5
This reverts commit d573e239f0, "Take fewer
snapshots". While that seemed like a good idea at the time, it caused
execution to use a snapshot that had been acquired before locking any of
the tables mentioned in the query. This created user-visible anomalies
that were not present in any prior release of Postgres, as reported by
Tomas Vondra. While this whole area could do with a redesign (since there
are related cases that have anomalies anyway), it doesn't seem likely that
any future patch would be reasonably back-patchable; and we don't want 9.2
to exhibit a behavior that's subtly unlike either past or future releases.
Hence, revert to prior code while we rethink the problem.
45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
/*-------------------------------------------------------------------------
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*
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* pquery.h
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* prototypes for pquery.c.
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*
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*
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* Portions Copyright (c) 1996-2012, 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/tcop/pquery.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PQUERY_H
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#define PQUERY_H
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#include "nodes/parsenodes.h"
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#include "utils/portal.h"
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extern PGDLLIMPORT Portal ActivePortal;
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extern PortalStrategy ChoosePortalStrategy(List *stmts);
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extern List *FetchPortalTargetList(Portal portal);
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extern List *FetchStatementTargetList(Node *stmt);
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extern void PortalStart(Portal portal, ParamListInfo params,
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int eflags, Snapshot snapshot);
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extern void PortalSetResultFormat(Portal portal, int nFormats,
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int16 *formats);
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extern bool PortalRun(Portal portal, long count, bool isTopLevel,
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DestReceiver *dest, DestReceiver *altdest,
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char *completionTag);
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extern long PortalRunFetch(Portal portal,
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FetchDirection fdirection,
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long count,
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DestReceiver *dest);
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#endif /* PQUERY_H */
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