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(parent: 996d273) | patch
Fetch XIDs atomically during vac_truncate_clog().
authorTom Lane <tgl@sss.pgh.pa.us>
Tue, 24 May 2016 19:47:51 +0000 (15:47 -0400)
committerTom Lane <tgl@sss.pgh.pa.us>
Tue, 24 May 2016 19:47:51 +0000 (15:47 -0400)
commit2d2e40e3befd8b9e0d2757554537345b15fa6ea2
tree24fef91106701c2f55b78a9bd15b72cc0b7b9cf6tree | snapshot
parent996d273978c6f21b8b66f7f3bdd979cc37736c7acommit | diff
Fetch XIDs atomically during vac_truncate_clog().

Because vac_update_datfrozenxid() updates datfrozenxid and datminmxid
in-place, it's unsafe to assume that successive reads of those values will
give consistent results.  Fetch each one just once to ensure sane behavior
in the minimum calculation.  Noted while reviewing Alexander Korotkov's
patch in the same area.

Discussion: <8564.1464116473@sss.pgh.pa.us>
src/backend/commands/vacuum.c diff | blob | history
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