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