Clark Sims wrote:
http://acumenconsultinginc.net/TechNotes/ThreadSafe/
I used the boost scoped_lock, and shared_ptr classes, to create 2 template classes which provide threadsafe access to a singleton class.
I also included the example of a singleton class which has a destructor.
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If your code is an library, you should only access these objects passing at constructor or initialize method. If your code is executable, or something begin at a entry point, you should allocate any objects in your entry point function, and pass them to low level library.