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CxxUtils: Fix potential race in ConcurrentRangeMap::trim().

Merged CxxUtils: Fix potential race in ConcurrentRangeMap::trim().
ssnyder/athena:trimRace.CxxUtils-20190106 into master
Merged Scott Snyder requested to merge ssnyder/athena:trimRace.CxxUtils-20190106 into master
  1. Jan 06, 2019
    • scott snyder's avatar
      CxxUtils: Fix potential race in ConcurrentRangeMap::trim(). · b6d89d41
      scott snyder authored 
      When finishing the trim() operation, the begin pointer must be updated
before queuing the dummy impl object for discard.  Otherwise, another thread
could potentially see a pointer to a deleted object.

Trying to fix infrequent crashes in CondCont_test observed in nightlies and CI.
      b6d89d41