BIND 10 #2850: Define and implement ZoneTableSegmentMapped

[BIND 10 Development]

#2850: Define and implement ZoneTableSegmentMapped
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            Reporter:  jinmei        |                        Owner:  muks
                Type:  task          |                       Status:
            Priority:  medium        |  assigned
           Component:  data source   |                    Milestone:
            Keywords:                |  Sprint-20130514
           Sensitive:  0             |                   Resolution:
         Sub-Project:  DNS           |                 CVSS Scoring:
Estimated Difficulty:  5             |              Defect Severity:  N/A
         Total Hours:  0             |  Feature Depending on Ticket:
                                     |  shared memory data source
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by muks):

 Replying to [comment:5 jinmei]:
 > The revised plan is to validate the checksum at the time of opening
 > an existing segment in the read-write mode.  At a higher level
 > only the memory manager updates and validates the checksum; other
 > applications will simply trust memmgr and open the given segment in
 > the read-only mode.

 I have implemented code to ignore the checksum when opening in READ_ONLY
 mode, but initially I was thinking that the solution to this problem
 should be to save the checksum separately from the mapped file (so that
 its contents are not used in checksum calculation).

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Ticket URL: <http://bind10.isc.org/ticket/2850#comment:6>
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