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   <h4 class="subsectionHead"><span class="titlemark">6.6   </span> <a 
 id="x46-830006.6"></a>psb_cdbldext &#8212; Build an extended communication descriptor</h4>
                                                                  

                                                                  
   <div class="verbatim" id="verbatim-62">
call&#x00A0;psb_cdbldext(a,desc_a,nl,desc_out,&#x00A0;info,&#x00A0;extype)
</div>
<!--l. 417--><p class="nopar" >
<!--l. 419--><p class="indent" >   This subroutine builds an extended communication descriptor, based on the input
descriptor <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">desc_a</span></span></span> and on the stencil specified through the input sparse matrix
<span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">a</span></span></span>.
     <dl class="description"><dt class="description">
<span 
class="cmbx-10">Type:</span> </dt><dd 
class="description">Synchronous.
     </dd><dt class="description">
<span 
class="cmbx-10">On Entry</span> </dt><dd 
class="description">
     </dd><dt class="description">
<span 
class="cmbx-10">a</span> </dt><dd 
class="description">A sparse matrix Scope:<span 
class="cmbx-10">local</span>.<br 
class="newline" />Type:<span 
class="cmbx-10">required</span>.<br 
class="newline" />Intent: <span 
class="cmbx-10">in</span>.<br 
class="newline" />Specified as: a structured data type.
     </dd><dt class="description">
<span 
class="cmbx-10">desc</span><span 
class="cmbx-10">_a</span> </dt><dd 
class="description">the communication descriptor.<br 
class="newline" />Scope:<span 
class="cmbx-10">local</span>.<br 
class="newline" />Type:<span 
class="cmbx-10">required</span>.<br 
class="newline" />Intent: <span 
class="cmbx-10">in</span>.<br 
class="newline" />Specified as: a structured data of type <a 
href="userhtmlsu6.html#spdata"><span 
class="cmtt-10">psb</span><span 
class="cmtt-10">_Tspmat</span><span 
class="cmtt-10">_type</span></a>.
     </dd><dt class="description">
<span 
class="cmbx-10">nl</span> </dt><dd 
class="description">the number of additional layers desired.<br 
class="newline" />Scope:<span 
class="cmbx-10">global</span>.<br 
class="newline" />Type:<span 
class="cmbx-10">required</span>.<br 
class="newline" />Intent: <span 
class="cmbx-10">in</span>.<br 
class="newline" />Specified as: an integer value <span 
class="cmmi-10">nl </span><span 
class="cmsy-10">&#x2265; </span>0.
     </dd><dt class="description">
<span 
class="cmbx-10">extype</span> </dt><dd 
class="description">the kind of estension required.<br 
class="newline" />Scope:<span 
class="cmbx-10">global</span>.<br 
class="newline" />Type:<span 
class="cmbx-10">optional </span>.<br 
class="newline" />Intent: <span 
class="cmbx-10">in</span>.<br 
class="newline" />Specified as: an integer value <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">psb_ovt_xhal_</span></span></span>, <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">psb_ovt_asov_</span></span></span>, default:
     <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">psb_ovt_xhal_</span></span></span>
     </dd></dl>
<!--l. 449--><p class="indent" >
     <dl class="description"><dt class="description">
<span 
class="cmbx-10">On Return</span> </dt><dd 
class="description">
                                                                  

                                                                  
     </dd><dt class="description">
<span 
class="cmbx-10">desc</span><span 
class="cmbx-10">_out</span> </dt><dd 
class="description">the extended communication descriptor.<br 
class="newline" />Scope:<span 
class="cmbx-10">local</span>.<br 
class="newline" />Type:<span 
class="cmbx-10">required</span>.<br 
class="newline" />Intent: <span 
class="cmbx-10">inout</span>.<br 
class="newline" />Specified as: a structured data of type <a 
href="userhtmlsu5.html#descdata"><span 
class="cmtt-10">psb</span><span 
class="cmtt-10">_desc</span><span 
class="cmtt-10">_type</span></a>.
     </dd><dt class="description">
<span 
class="cmbx-10">info</span> </dt><dd 
class="description">Error code.<br 
class="newline" />Scope: <span 
class="cmbx-10">local </span><br 
class="newline" />Type: <span 
class="cmbx-10">required </span><br 
class="newline" />Intent: <span 
class="cmbx-10">out</span>.<br 
class="newline" />An integer value; 0 means no error has been detected.</dd></dl>
<!--l. 463--><p class="noindent" ><span 
class="cmbx-12">Notes</span>
     <ol  class="enumerate1" >
     <li 
  class="enumerate" id="x46-83002x1">Specifying <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">psb_ovt_xhal_</span></span></span> for the <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">extype</span></span></span> argument the user will obtain a
     descriptor for a domain partition in which the additional layers are fetched
     as part of an (extended) halo; however the index-to-process mapping is
     identical to that of the base descriptor;
     </li>
     <li 
  class="enumerate" id="x46-83004x2">Specifying <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">psb_ovt_asov_</span></span></span> for the <span class="obeylines-h"><span class="verb"><span 
class="cmtt-10">extype</span></span></span> argument the user will obtain
     a descriptor with an overlapped decomposition: the additional layer is
     aggregated to the local subdomain (and thus is an overlap), and a new
     halo extending beyond the last additional layer is formed.</li></ol>
                                                                  

                                                                  
                                                                  

                                                                  
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