Ensure age() returns a stable value rather than the latest value
Branch
------
REL9_0_STABLE
Details
-------
http://git.postgresql.org/pg/commitdiff/67ff11b42b2811c18fc9dfa54ded02303a082f7c
Modified Files
--------------
src/backend/access/transam/xact.c | 22 ++++++++++++++++++++++
src/backend/utils/adt/xid.c | 8 +++-----
src/include/access/xact.h | 1 +
3 files changed, 26 insertions(+), 5 deletions(-)