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original version by: Nikos Drakos, CBLU, University of Leeds
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<H2><A NAME="SECTION00089000000000000000">
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psb_bcast -- Broadcast data</A>
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</H2>
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<P>
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<PRE>
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call psb_bcast(icontxt, dat, root)
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</PRE>
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<P>
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This subroutine implements a broadcast operation based on the
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underlying communication library.
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<DL>
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<DT><STRONG>Type:</STRONG></DT>
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<DD>Synchronous.
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</DD>
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<DT><STRONG><B>On Entry </B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>icontxt</STRONG></DT>
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<DD>the communication context identifying the virtual
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parallel machine.
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<BR>
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Scope: <B>global</B>.
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<BR>
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Type: <B>required</B>.
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: an integer variable.
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</DD>
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<DT><STRONG>dat</STRONG></DT>
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<DD>On the root process, the data to be broadcast.
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<BR>
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Scope: <B>global</B>.
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<BR>
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Type: <B>required</B>.
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<BR>
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Intent: <B>inout</B>.
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<BR>
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Specified as: an integer, real or complex variable, which may be a
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scalar, or a rank 1 or 2 array, or a character or logical variable,
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which may be a scalar or rank 1 array. Type, kind, rank and size must agree on all processes.
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</DD>
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<DT><STRONG>root</STRONG></DT>
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<DD>Root process holding data to be broadcast.
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<BR>
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Scope: <B>global</B>.
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<BR>
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Type: <B>optional</B>.
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<BR>
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Intent: <B>in</B>.
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<BR>
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Specified as: an integer value <!-- MATH
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$0<= root <= np-1$
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-->
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<IMG
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WIDTH="153" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img123.png"
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ALT="$0<= root <= np-1$">, default 0 </DD>
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</DL>
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<P>
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<DL>
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<DT><STRONG><B>On Return</B></STRONG></DT>
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<DD>
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</DD>
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<DT><STRONG>dat</STRONG></DT>
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<DD>On processes other than root, the data to be broadcast.
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<BR>
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Scope: <B>global</B>.
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<BR>
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Type: <B>required</B>.
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<BR>
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Intent: <B>inout</B>.
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<BR>
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Specified as: an integer, real or complex variable, which may be a
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scalar, or a rank 1 or 2 array, or a character or logical scalar. Type, kind, rank and size must agree on all processes.
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