BIND 10 #2860: optimize initial load: update memmgr

[BIND 10 Development]

#2860: optimize initial load: update memmgr
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                   Reporter:         |                 Owner:
  jinmei                             |                Status:  new
                       Type:  task   |             Milestone:  New Tasks
                   Priority:         |              Keywords:
  medium                             |             Sensitive:  0
                  Component:  shmem  |           Sub-Project:  DNS
  manager                            |  Estimated Difficulty:  0
               CVSS Scoring:         |           Total Hours:  0
            Defect Severity:  N/A    |
Feature Depending on Ticket:         |
  shared memory data source          |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 Subtask of #2830.  Continuation of #2859.  Also depend on #2856.

 Using the #2859 extension, we complete the optimization.  Revise the
 memmgr initialization so it first checks the existence of the mapped
 file, and if it does, open (reset) it in the READ_WRITE mode instead
 of CREATE.  If the existing file contains the latest version of the
 zone, reset_memory_segment() says so and it doesn't have to actually
 (re)load it.

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Ticket URL: <http://bind10.isc.org/ticket/2860>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development