BIND 10 #2055: asiolink wrapper for io_service::post()

[BIND 10 Development]

#2055: asiolink wrapper for io_service::post()
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  medium        |                    Milestone:  Next-
           Component:  Unclassified  |  Sprint-Proposed
           Sensitive:  0             |                     Keywords:
         Sub-Project:  Core          |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 We'll need this for non-I/O asynchronous operations, such as
 "background" reloading of a zone into memory or "background" releasing
 of the old version of the zone afterwards.

 It would be something simple like
 `asiolink::IOService::post(boost::function)`.

 (note: as a last resort we could refer to the underlying asio
 io_service object using get_io_service() and call post() on it, but
 that breaks the whole purpose of asiolink and should be basically
 avoided).

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Ticket URL: <http://bind10.isc.org/ticket/2055>
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