https://issues.dlang.org/show_bug.cgi?id=15007

          Issue ID: 15007
           Summary: core.atomic match C++11
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Windows
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: druntime
          Assignee: nobody@puremagic.com
          Reporter: turkeyman@gmail.com

I'm porting some code using C++11 <atomic> which provides std::atomic<T>, and
has some useful methods.
core.atomic provides the primitives with which these can be created, but I
think core.atomic should go one step further and provide the direct parallels
to C++'s std::atomic to make porting code fast and painless.

The missing functions are:
  exchange, fetch_***, compare_exchange_weak/strong

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