[bind10-dev] take 2: design and inter-process protocol for shared memory

[JINMEI Tatuya / 神明達哉]

I've updated the wiki page on this based on the list and team call
discussions: http://bind10.isc.org/wiki/SharedMemoryIPC

The new version assumes reliability of the message bus and the
existence of a membership notification mechanism, and removes
retransmission and timeout as a result.  On closely revisiting the
scenario, it seemed to me that we actually don't need to track the
existence of the manager at the user/reader/consumer side, so it
doesn't include it.  It also seemed we need only one type of message
exchange, "update (and possibly its ack)", to cover all cases, and
this version is designed based on that approach.

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JINMEI, Tatuya