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<head><title>psb_bcast — Broadcast data</title>
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<!--l. 280--><div class="crosslinks"><p class="noindent">[<a
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<h4 class="subsectionHead"><span class="titlemark">7.9 </span> <a
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id="x77-1140007.9"></a>psb_bcast — Broadcast data</h4>
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<pre class="verbatim" id="verbatim-69">
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call psb_bcast(ctxt, dat [, root, mode, request])
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</pre>
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<!--l. 284--><p class="nopar" >
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<!--l. 286--><p class="indent" > This subroutine implements a broadcast operation based on the underlying
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communication library.
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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">dat</span> </dt><dd
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class="description">On the root process, the data to be broadcast.<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">inout</span>.<br
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class="newline" />Specified as: an integer, real or complex variable, which may be a scalar,
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or a rank 1 or 2 array, or a character or logical variable, which may be
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a scalar or rank 1 array.  Type, kind, rank and size must agree on all
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processes.
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</dd><dt class="description">
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<span
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class="cmbx-10">root</span> </dt><dd
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class="description">Root process holding data to be broadcast.<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: an integer value 0 <span
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class="cmmi-10"><</span>= <span
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class="cmmi-10">root <</span>= <span
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class="cmmi-10">np </span><span
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class="cmsy-10">- </span>1, default 0  
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</dd><dt class="description">
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<span
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class="cmbx-10">mode</span> </dt><dd
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class="description">Whether the call is started in non-blocking mode and completed later,
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or is executed synchronously.<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: an integer value. The action to be taken is determined by
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its bit fields, which can be set with bitwise <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">OR</span></span></span>. Basic action values are
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<span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">psb_collective_start_</span></span></span>, <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">psb_collective_end_</span></span></span>. Default: both fields are
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selected (i.e. require synchronous completion).<br
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class="newline" />
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</dd><dt class="description">
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<span
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class="cmbx-10">request</span> </dt><dd
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class="description">A request variable to check for operation completion.<br
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class="newline" />Scope: <span
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class="cmbx-10">local</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">inout</span>.<br
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class="newline" />If <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">mode</span></span></span> does not specify synchronous completion, then this variable must
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be present.</dd></dl>
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<!--l. 328--><p class="indent" >
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<dl class="description"><dt class="description">
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<span
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class="cmbx-10">On Return</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">dat</span> </dt><dd
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class="description">On all processes other than root, the broadcasted data.<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">inout</span>.<br
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class="newline" />Specified as: an integer, real or complex variable, which may be a scalar,
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or a rank 1 or 2 array, or a character or logical scalar.  Type, kind, rank
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and size must agree on all processes.
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</dd><dt class="description">
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<span
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class="cmbx-10">request</span> </dt><dd
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class="description">A request variable to check for operation completion.<br
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class="newline" />Scope: <span
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class="cmbx-10">local</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">inout</span>.<br
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class="newline" />If <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">mode</span></span></span> does not specify synchronous completion, then this variable must
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be present.</dd></dl>
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<!--l. 345--><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="x77-114002x1">The <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">dat</span></span></span> argument is both input and output, and its value may be changed
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even on processes different from the final result destination.
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</li>
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<li
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class="enumerate" id="x77-114004x2">When splitting the operation in two calls, the <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">dat</span></span></span> argument must not be
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accessed between calls:
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<div class="center"
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>
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<!--l. 361--><p class="noindent" >
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<div class="minipage"><pre class="verbatim" id="verbatim-70">
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  call psb_bcast(ctxt,dat,mode=psb_collective_start_,request=bcast_request)
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  .......
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  call psb_bcast(ctxt,dat,mode=psb_collective_end_, request=bcast_request)
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</pre>
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<!--l. 367--><p class="nopar" ></div></div>
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</li></ol>
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href="userhtmlsu69.html" >next</a>] [<a
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href="userhtmlsu64.html" >prev</a>] [<a
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href="userhtmlsu64.html#tailuserhtmlsu64.html" >prev-tail</a>] [<a
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href="userhtmlsu65.html" >front</a>] [<a
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href="userhtmlsu59.html#userhtmlsu68.html" >up</a>] </p></div>
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