Opaque updThread updThreadC containsThread getThreadC getThreadR lockRes.

Lemma computeMap_ext: forall pmap pmap' dmap, (forall b ofs, pmap !! b ofs = pmap' !! b ofs) ->
forall b ofs, (computeMap pmap dmap) !! b ofs = (computeMap pmap' dmap) !! b ofs.