BIND 10 #2088: introduce MemorySegment class

[BIND 10 Development]

#2088: introduce MemorySegment class
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                   Reporter:         |                 Owner:
  jinmei                             |                Status:  new
                       Type:  task   |             Milestone:  Next-Sprint-
                   Priority:         |  Proposed
  medium                             |            Resolution:
                  Component:  data   |             Sensitive:  0
  source                             |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  0
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:  in-    |
  memory NSEC                        |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Description changed by jinmei:

Old description:

> We'll use this so we can use various types of memory segment ('local',
> 'shared memory', 'mmap) transparently.
>
> - define an abstract base class.  We only need the simplest allocator
>   and deallocator:
> {{{#!cpp
>   void* allocate(size_t size);
>   void deallocate(void* ptr, size_t size);
> }}};
>   (note: the size parameter is not mandatory functionality-wise, but
>    we'll need this if we want to detect memory
>   it'd also be better to have "allMemoryDeallocated" for memory leak
>   detection
> - define and implement LocalMemorySegment derived class.
>   It internally uses malloc/free or new/delete.  not sure this
>   should be a "nothrow" version (probably not, but think about it)
>
> No dependency.  Can start anytime.

New description:

 We'll use this so we can use various types of memory segment ('local',
 'shared memory', 'mmap') transparently.

 - define an abstract base class.  We only need the simplest allocator
   and deallocator:
 {{{#!cpp
   void* allocate(size_t size);
   void deallocate(void* ptr, size_t size);
 }}}
   note: the size parameter for `deallocate` is not mandatory
   functionality-wise, but we'll need this if we want to detect memory
   it'd also be better to have "allMemoryDeallocated" for memory leak
   detection
 - define and implement `LocalMemorySegment` derived class.
   It internally uses malloc/free or new/delete.  not sure this
   should be a "nothrow" version (probably not, but think about it)

 No dependency.  Can start anytime.

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Ticket URL: <http://bind10.isc.org/ticket/2088#comment:1>
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