ss="link" href="../../boost/log/sinks/unlocked_sink.html" title="Class template unlocked_sink">unlocked_sink</a></code>
          but additionally provides thread synchronization with a mutex before passing
          log records to the backend. All sink backends that support formatting currently
          require thread synchronization in the frontend.
        </p>
<p>
          The synchronous sink also introduces the ability to acquire a pointer to
          the locked backend. As long as the pointer exis