BIND 10 #327: early work on recursion

[BIND 10 Development]

#327: early work on recursion
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      Reporter:  each      |        Owner:  each                 
          Type:  defect    |       Status:  reviewing            
      Priority:  major     |    Milestone:  y2 12 month milestone
     Component:  recurser  |   Resolution:                       
      Keywords:            |    Sensitive:  0                    
Estimatedhours:  0.0       |        Hours:  0                    
      Billable:  1         |   Totalhours:  0                    
      Internal:  0         |  
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Comment(by jinmei):

 A couple of incomplete comments:
  - in asiolink_unittest.cc, we use the public interface of
 asio::io_service.  basically "asiolink" is designed so that we don't have
 to refer to the original asio definitions.  not sure how difficult it is,
 but we should replace it with IOService.
  - for a similar reason, including internal/{tcp,udp}dns.h in
 asiolink_unittest.cc is not good.  btw, if we don't use asio::io_service
 it compiles without these header files, so at least including these
 doesn't make sense.

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Ticket URL: <http://bind10.isc.org/ticket/327#comment:16>
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