t must be one of the following
                  values:
             </p>
          <div class="itemizedlist">
            <ul type="disc">
              <li>
                <p>
                        <code class="literal">DB_MEM_LOCK</code>
                    </p>
                <p>
                        Initialize locks.  A thread uses this structure
                        to lock a page (or record for the QUEUE access
                        method) and hold it to the end of a transactions.
     