Thread: pgsql: Ensure that a cursor has an immutable snapshot throughout its
pgsql: Ensure that a cursor has an immutable snapshot throughout its
From
alvherre@postgresql.org (Alvaro Herrera)
Date:
Log Message:
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Ensure that a cursor has an immutable snapshot throughout its lifespan.
The old coding was using a regular snapshot, referenced elsewhere, that was
subject to having its command counter updated. Fix by creating a private copy
of the snapshot exclusively for the cursor.
Backpatch to 8.4, which is when the bug was introduced during the snapshot
management rewrite.
Tags:
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REL8_4_STABLE
Modified Files:
--------------
pgsql/src/backend/commands:
portalcmds.c (r1.79 -> r1.79.2.1)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/portalcmds.c?r1=1.79&r2=1.79.2.1)
pgsql/src/backend/executor:
spi.c (r1.208 -> r1.208.2.1)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/spi.c?r1=1.208&r2=1.208.2.1)
pgsql/src/backend/utils/time:
snapmgr.c (r1.10 -> r1.10.2.1)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/time/snapmgr.c?r1=1.10&r2=1.10.2.1)
pgsql/src/include/utils:
snapmgr.h (r1.5 -> r1.5.2.1)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/utils/snapmgr.h?r1=1.5&r2=1.5.2.1)
pgsql/src/test/regress/expected:
portals.out (r1.21 -> r1.21.2.1)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/portals.out?r1=1.21&r2=1.21.2.1)
pgsql/src/test/regress/sql:
portals.sql (r1.16 -> r1.16.2.1)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/portals.sql?r1=1.16&r2=1.16.2.1)