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vacuum.c

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    • Tom Lane's avatar
      4cf0978e
      Fetch XIDs atomically during vac_truncate_clog(). · 4cf0978e
      Tom Lane authored 
      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>
      4cf0978e
      History
      Fetch XIDs atomically during vac_truncate_clog().
      Tom Lane authored 
      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>