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<h4 class="subsectionHead"><span class="titlemark">7.3 </span> <a
id="x71-1080007.3"></a>psb_exit &#8212; Exit from PSBLAS parallel environment</h4>
<div class="verbatim" id="verbatim-63">
call&#x00A0;psb_exit(ctxt)
&#x00A0;<br />call&#x00A0;psb_exit(ctxt,close)
</div>
<!--l. 117--><p class="nopar" >
<!--l. 119--><p class="indent" > This subroutine exits from the PSBLAS parallel virtual machine.
<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">ctxt</span> </dt><dd
class="description">the communication context identifying the virtual parallel machine.<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 variable.
</dd><dt class="description">
<span
class="cmbx-10">close</span> </dt><dd
class="description">Whether to close all data structures related to the virtual parallel
machine, besides those associated with ctxt.<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: a logical variable, default value: true.</dd></dl>
<!--l. 137--><p class="noindent" ><span
class="cmbx-12">Notes</span>
<ol class="enumerate1" >
<li
class="enumerate" id="x71-108002x1">This routine may be called even if a previous call to <span class="obeylines-h"><span class="verb"><span
class="cmtt-10">psb_info</span></span></span> has returned
with <span
class="cmmi-10">iam </span>= <span
class="cmsy-10">-</span>1; indeed, it it is the only routine that may be called with
argument <span class="obeylines-h"><span class="verb"><span
class="cmtt-10">ctxt</span></span></span> in this situation.
</li>
<li
class="enumerate" id="x71-108004x2">A call to this routine with <span class="obeylines-h"><span class="verb"><span
class="cmtt-10">close=.true.</span></span></span> implies a call to <span class="obeylines-h"><span class="verb"><span
class="cmtt-10">MPI_Finalize</span></span></span>,
after which no parallel routine may be called.
</li>
<li
class="enumerate" id="x71-108006x3">If the user whishes to use multiple communication contexts in the
same program, or to enter and exit multiple times into the parallel
environment, this routine may be called to selectively close the contexts
with <span class="obeylines-h"><span class="verb"><span
class="cmtt-10">close=.false.</span></span></span>, while on the last call it should be called with
<span class="obeylines-h"><span class="verb"><span
class="cmtt-10">close=.true.</span></span></span> to shutdown in a clean way the entire parallel environment.</li></ol>
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