Neal did something on this before. Look through the bug-hurd and hurd-devel archives for "System V Shared Memory" (or just google for that plus hurd). I think the conclusion of that was he had a proposal that used existing filesystem calls to implement almost everything. I don't recall the details at the moment, but digging them up and reviving the discussion would be a good thing. I don't think there is very much work involved in making it all work.
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