BIND 10 #352: Improve Xfrout request handling strategy

[BIND 10 Development]

#352: Improve Xfrout request handling strategy
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  Reporter:  zzchen_pku   |            Owner:     
      Type:  enhancement  |           Status:  new
  Priority:  major        |        Milestone:     
 Component:  xfrout       |         Keywords:     
 Sensitive:  0            |   Estimatedhours:  0  
     Hours:  0            |         Billable:  1  
Totalhours:  0            |         Internal:  0  
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 Xfrout server polls for shutdown every 0.1 seconds. Polling reduces Xfrout
 server's responsiveness to a shutdown request and wastes cpu at all other
 times. Consider using interrupt-driven instead of polling.

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Ticket URL: <https://bind10.isc.org/ticket/352>
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