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193 lines
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<H2><A NAME="SECTION000815000000000000000">
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psb_snd -- Send data</A>
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<P>
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<PRE>
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call psb_snd(icontxt, dat, dst, m)
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</PRE>
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<P>
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This subroutine sends a packet of data to a destination.
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<DL>
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<DT><STRONG>Type:</STRONG></DT>
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<DD>Synchronous: see usage notes.
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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>The data to be sent.
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<BR>
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Scope: <B>local</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, 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 and rank must agree on sender and receiver process; if <IMG
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WIDTH="18" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
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SRC="img129.png"
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ALT="$m$"> is
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not specified, size must agree as well.
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</DD>
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<DT><STRONG>dst</STRONG></DT>
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<DD>Destination process.
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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 value <!-- MATH
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$0<= dst <= np-1$
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-->
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<IMG
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WIDTH="145" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img130.png"
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ALT="$0<= dst <= np-1$">.
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<BR></DD>
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<DT><STRONG>m</STRONG></DT>
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<DD>Number of rows.
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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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$0<= m <= size(dat,1)$
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-->
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<IMG
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WIDTH="172" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img131.png"
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ALT="$0<= m <= size(dat,1)$">.
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<BR>
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When <IMG
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WIDTH="26" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img132.png"
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ALT="$dat$"> is a rank 2 array, specifies the number of rows to be sent
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independently of the leading dimension <IMG
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WIDTH="83" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img133.png"
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ALT="$size(dat,1)$">; must have the
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same value on sending and receiving processes.
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</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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</DL>
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<P>
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<FONT SIZE="+1"><B>Notes</B></FONT>
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<OL>
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<LI>This subroutine implies a synchronization, but only between the
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calling process and the destination process <IMG
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WIDTH="25" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img134.png"
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ALT="$dst$">.
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</LI>
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</OL>
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HREF="node87.html">psb_rcv Receive</A>
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HREF="node71.html">Parallel environment routines</A>
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