We talked about refactoring the mapper classes, in particular moving the
special metronome stuff from the base class into the metronome mapper, and
making peek's read lock actually do some protecting.
I coded that and committed it on new branch refactor-mapped-buffer
I've moved the read lock in MappedEventBuffer::peek into
MappedBufMetaIterator functions so that it covers the entire scope during
which the MappedEvent pointer is exposed. It's not perfect, because
caller has to know to do that, but it's much better than my first
solution.
Tom Breton (Tehom)
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