;
} </pre>
      <p>
        That completes <code class="function">main()</code>. The bulk of our 
        <code class="function">writer_thread()</code> function implementation is
        unchanged from the initial transaction example, except that we no
        longer check for <code class="literal">DB_KEYEXISTS</code> in our 
        <code class="methodname">DB-&gt;put()</code> return code. Because we are
        configuring for a completely in-memory database, there is no
        possibility that we can r