pan class="lineno">   44</span><span class="comment"> *     each side can both lend and borrow, allocate and write within the same `Arena`.  Hence they will</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span><span class="comment"> *     map `Arena` to itself.  The `Arena` object also acts as the `Shm_session`.</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span><span class="comment"> *   - Arena-lending SHM-providers 