low">drop_on_overflow</a></code>.
              When the queue is full, silently drop excessive log records.
            </li>
<li class="listitem">
              <code class="computeroutput"><a class="link" href="../../boost/log/sinks/block_on_overflow.html" title="Class block_on_overflow">block_on_overflow</a></code>.
              When the queue is full, block the logging thread until the backend
              feeding thread manages to process some of the queued records.
            </li>
</ul></div>
<p>