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base/modules/psb_desc_mod.F90 docs/html/footnode.html docs/html/img100.png docs/html/img101.png docs/html/img102.png docs/html/img103.png docs/html/img104.png docs/html/img105.png docs/html/img106.png docs/html/img107.png docs/html/img108.png docs/html/img109.png docs/html/img110.png docs/html/img111.png docs/html/img112.png docs/html/img113.png docs/html/img114.png docs/html/img115.png docs/html/img116.png docs/html/img117.png docs/html/img118.png docs/html/img119.png docs/html/img120.png docs/html/img121.png docs/html/img122.png docs/html/img123.png docs/html/img124.png docs/html/img125.png docs/html/img126.png docs/html/img127.png docs/html/img128.png docs/html/img129.png docs/html/img130.png docs/html/img131.png docs/html/img132.png docs/html/img133.png docs/html/img134.png docs/html/img135.png docs/html/img136.png docs/html/img137.png docs/html/img138.png docs/html/img139.png docs/html/img140.png docs/html/img141.png docs/html/img142.png docs/html/img143.png docs/html/img144.png 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Use it in GENPDE. Update docs
This commit is contained in:
Salvatore Filippone
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@@ -7,8 +7,8 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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Jens Lippmann, Marek Rouchal, Martin Wilck and others -->
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<HTML>
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<HEAD>
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<TITLE>Error handling</TITLE>
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<META NAME="description" CONTENT="Error handling">
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<TITLE>psb_rcv -- Receive data</TITLE>
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<META NAME="description" CONTENT="psb_rcv -- Receive data">
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<META NAME="keywords" CONTENT="userhtml">
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<META NAME="resource-type" CONTENT="document">
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<META NAME="distribution" CONTENT="global">
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@@ -18,325 +18,172 @@ original version by: Nikos Drakos, CBLU, University of Leeds
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<LINK REL="STYLESHEET" HREF="userhtml.css">
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<LINK REL="up" HREF="userhtml.html">
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<LINK REL="previous" HREF="node110.html">
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<LINK REL="up" HREF="node95.html">
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<LINK REL="next" HREF="node112.html">
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</HEAD>
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<BODY >
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<!--Navigation Panel-->
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<A NAME="tex2html1627"
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<A NAME="tex2html1630"
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HREF="node112.html">
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<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A>
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<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A>
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<BR>
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<B> Next:</B> <A NAME="tex2html1628"
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HREF="node112.html">Utilities</A>
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<B> Up:</B> <A NAME="tex2html1624"
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HREF="userhtml.html">userhtml</A>
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<B> Previous:</B> <A NAME="tex2html1618"
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HREF="node110.html">psb_rcv Receive</A>
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<B> <A NAME="tex2html1626"
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<B> Next:</B> <A NAME="tex2html1631"
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HREF="node112.html">Error handling</A>
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<B> Up:</B> <A NAME="tex2html1627"
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HREF="node95.html">Parallel environment routines</A>
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<B> Previous:</B> <A NAME="tex2html1623"
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HREF="node110.html">psb_snd Send</A>
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<B> <A NAME="tex2html1629"
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HREF="node1.html">Contents</A></B>
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<BR>
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<BR>
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<!--End of Navigation Panel-->
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<H1><A NAME="SECTION00090000000000000000">
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Error handling</A>
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</H1>
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<H2><A NAME="SECTION000816000000000000000">
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psb_rcv -- Receive data</A>
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</H2>
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<P>
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The PSBLAS library error handling policy has been completely rewritten
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in version 2.0. The idea behind the design of this new error handling
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strategy is to keep error messages on a stack allowing the user to
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trace back up to the point where the first error message has been
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generated. Every routine in the PSBLAS-2.0 library has, as last
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non-optional argument, an integer <code>info</code> variable; whenever,
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inside the routine, an error is detected, this variable is set to a
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value corresponding to a specific error code. Then this error code is
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also pushed on the error stack and then either control is returned to
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the caller routine or the execution is aborted, depending on the users
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choice. At the time when the execution is aborted, an error message is
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printed on standard output with a level of verbosity than can be
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chosen by the user. If the execution is not aborted, then, the caller
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routine checks the value returned in the <code>info</code> variable and, if
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not zero, an error condition is raised. This process continues on all the
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levels of nested calls until the level where the user decides to abort
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the program execution.
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<P>
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Figure <A HREF="#fig:routerr">9</A> shows the layout of a generic <code>psb_foo</code>
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routine with respect to the PSBLAS-2.0 error handling policy. It is
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possible to see how, whenever an error condition is detected, the
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<code>info</code> variable is set to the corresponding error code which is,
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then, pushed on top of the stack by means of the
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<code>psb_errpush</code>. An error condition may be directly detected inside
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a routine or indirectly checking the error code returned returned by a
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called routine. Whenever an error is encountered, after it has been
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pushed on stack, the program execution skips to a point where the
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error condition is handled; the error condition is handled either by
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returning control to the caller routine or by calling the
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<code>psb\_error</code> routine which prints the content of the error stack
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and aborts the program execution, according to the choice made by the
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user with <code>psb_set_erraction</code>. The default is to print the error
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and terminate the program, but the user may choose to handle the error
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explicitly.
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<P>
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<DIV ALIGN="CENTER"><A NAME="fig:routerr"></A><A NAME="7079"></A>
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<TABLE>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure 9:</STRONG>
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The layout of a generic <TT>psb_foo</TT>
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routine with respect to PSBLAS-2.0 error handling policy.</CAPTION>
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<TR><TD>
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<BR>
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<DIV ALIGN="CENTER">
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<!-- MATH
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$\fbox{\TheSbox}$
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-->
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<IMG
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WIDTH="563" HEIGHT="482" ALIGN="MIDDLE" BORDER="0"
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SRC="img143.png"
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ALT="\fbox{\TheSbox}">
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</DIV></TD></TR>
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</TABLE>
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</DIV>
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<P>
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Figure <A HREF="#fig:errormsg">10</A> reports a sample error message generated by
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the PSBLAS-2.0 library. This error has been generated by the fact that
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the user has chosen the invalid ``FOO'' storage format to represent
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the sparse matrix. From this error message it is possible to see that
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the error has been detected inside the <code>psb_cest</code> subroutine
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called by <code>psb_spasb</code> ... by process 0 (i.e. the root process).
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<P>
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<DIV ALIGN="CENTER"><A NAME="fig:errormsg"></A><A NAME="7080"></A>
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<TABLE>
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<CAPTION ALIGN="BOTTOM"><STRONG>Figure 10:</STRONG>
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A sample PSBLAS-2.0 error
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message. Process 0 detected an error condition inside the psb_cest subroutine</CAPTION>
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<TR><TD>
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<BR>
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<DIV ALIGN="CENTER">
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<!-- MATH
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$\fbox{\TheSbox}$
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-->
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<IMG
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WIDTH="563" HEIGHT="482" ALIGN="MIDDLE" BORDER="0"
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SRC="img143.png"
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ALT="\fbox{\TheSbox}">
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</DIV></TD></TR>
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</TABLE>
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</DIV>
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<P>
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ifstarsubroutinesubroutinepsb_errpushPushes an error code onto the error
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stack
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<P>
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<BR>
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<IMG
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WIDTH="423" HEIGHT="16" ALIGN="BOTTOM" BORDER="0"
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SRC="img145.png"
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ALT="\begin{lstlisting}
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call psb_errpush(err_c, r_name, i_err, a_err)
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\end{lstlisting}">
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<BR>
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<PRE>
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call psb_rcv(icontxt, dat, src, m)
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</PRE>
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<P>
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This subroutine receives 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>Asynchronous.
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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>err_c</STRONG></DT>
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<DD>the error code
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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.
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</DD>
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<DT><STRONG>r_name</STRONG></DT>
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<DD>the soutine where the error has been caught.
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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: a string.
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<BR></DD>
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<DT><STRONG>i_err</STRONG></DT>
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<DD>addional info for error code
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<BR>
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Scope: <B>local</B>
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<BR>
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Type: <B>optional</B>
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<BR>
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Specified as: an integer array
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<BR></DD>
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<DT><STRONG>a_err</STRONG></DT>
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<DD>addional info for error code
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<BR>
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Scope: <B>local</B>
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<BR>
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Type: <B>optional</B>
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<BR>
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Specified as: a string.
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<BR></DD>
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</DL>
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<P>
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ifstarsubroutinesubroutinepsb_errorPrints the error stack content and aborts
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execution
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<P>
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<BR>
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<IMG
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WIDTH="213" HEIGHT="16" ALIGN="BOTTOM" BORDER="0"
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SRC="img146.png"
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ALT="\begin{lstlisting}
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call psb_error(icontxt)
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\end{lstlisting}">
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<BR>
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<P>
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<DL>
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<DT><STRONG>Type:</STRONG></DT>
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<DD>Asynchronous.
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</DD>
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<DT><STRONG><B>On Entry</B></STRONG></DT>
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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.
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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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Scope: <B>global</B>.
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<BR>
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Type: <B>optional</B>
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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.
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Specified as: an integer variable.
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</DD>
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<DT><STRONG>src</STRONG></DT>
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<DD>Source 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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$0<= src <= np-1$
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-->
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<IMG
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WIDTH="147" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img139.png"
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ALT="$0<= src <= np-1$">.
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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="img135.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="img136.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="img137.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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ifstarsubroutinesubroutinepsb_set_errverbositySets the verbosity of error
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messages.
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<P>
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<BR>
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<IMG
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WIDTH="261" HEIGHT="16" ALIGN="BOTTOM" BORDER="0"
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SRC="img147.png"
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ALT="\begin{lstlisting}
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call psb_set_errverbosity(v)
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\end{lstlisting}">
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<BR>
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<P>
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<DL>
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<DT><STRONG>Type:</STRONG></DT>
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<DD>Asynchronous.
|
||||
</DD>
|
||||
<DT><STRONG><B>On Entry</B></STRONG></DT>
|
||||
<DT><STRONG><B>On Return</B></STRONG></DT>
|
||||
<DD>
|
||||
</DD>
|
||||
<DT><STRONG>v</STRONG></DT>
|
||||
<DD>the verbosity level
|
||||
<DT><STRONG>dat</STRONG></DT>
|
||||
<DD>The data to be received.
|
||||
<BR>
|
||||
Scope: <B>global</B>
|
||||
Scope: <B>local</B>.
|
||||
<BR>
|
||||
Type: <B>required</B>
|
||||
Type: <B>required</B>.
|
||||
<BR>
|
||||
Intent: <B>in</B>.
|
||||
Intent: <B>inout</B>.
|
||||
<BR>
|
||||
Specified as: an integer.
|
||||
Specified as: an integer, real or complex variable, which may be a
|
||||
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
|
||||
WIDTH="18" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
|
||||
SRC="img133.png"
|
||||
ALT="$m$"> is
|
||||
not specified, size must agree as well.
|
||||
</DD>
|
||||
</DL>
|
||||
|
||||
<P>
|
||||
ifstarsubroutinesubroutinepsb_set_erractionSet the type of action to be
|
||||
taken upon error condition.
|
||||
<FONT SIZE="+1"><B>Notes</B></FONT>
|
||||
|
||||
<P>
|
||||
<BR>
|
||||
<IMG
|
||||
WIDTH="289" HEIGHT="16" ALIGN="BOTTOM" BORDER="0"
|
||||
SRC="img148.png"
|
||||
ALT="\begin{lstlisting}
|
||||
call psb_set_erraction(err_act)
|
||||
\end{lstlisting}">
|
||||
<BR>
|
||||
|
||||
<P>
|
||||
<DL>
|
||||
<DT><STRONG>Type:</STRONG></DT>
|
||||
<DD>Asynchronous.
|
||||
</DD>
|
||||
<DT><STRONG><B>On Entry</B></STRONG></DT>
|
||||
<DD>
|
||||
</DD>
|
||||
<DT><STRONG>err_act</STRONG></DT>
|
||||
<DD>the type of action.
|
||||
<BR>
|
||||
Scope: <B>global</B>
|
||||
<BR>
|
||||
Type: <B>required</B>
|
||||
<BR>
|
||||
Intent: <B>in</B>.
|
||||
<BR>
|
||||
Specified as: an integer. Possible values: <code>psb_act_ret</code>,
|
||||
<code>psb_act_abort</code>.
|
||||
</DD>
|
||||
</DL>
|
||||
<OL>
|
||||
<LI>This subroutine implies a synchronization, but only between the
|
||||
calling process and the source process <IMG
|
||||
WIDTH="26" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
|
||||
SRC="img140.png"
|
||||
ALT="$src$">.
|
||||
</LI>
|
||||
</OL>
|
||||
|
||||
<P>
|
||||
<HR>
|
||||
<!--Navigation Panel-->
|
||||
<A NAME="tex2html1627"
|
||||
<A NAME="tex2html1630"
|
||||
HREF="node112.html">
|
||||
<IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A>
|
||||
<A NAME="tex2html1623"
|
||||
HREF="userhtml.html">
|
||||
<A NAME="tex2html1626"
|
||||
HREF="node95.html">
|
||||
<IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A>
|
||||
<A NAME="tex2html1617"
|
||||
<A NAME="tex2html1622"
|
||||
HREF="node110.html">
|
||||
<IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A>
|
||||
<A NAME="tex2html1625"
|
||||
<A NAME="tex2html1628"
|
||||
HREF="node1.html">
|
||||
<IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A>
|
||||
<BR>
|
||||
<B> Next:</B> <A NAME="tex2html1628"
|
||||
HREF="node112.html">Utilities</A>
|
||||
<B> Up:</B> <A NAME="tex2html1624"
|
||||
HREF="userhtml.html">userhtml</A>
|
||||
<B> Previous:</B> <A NAME="tex2html1618"
|
||||
HREF="node110.html">psb_rcv Receive</A>
|
||||
<B> <A NAME="tex2html1626"
|
||||
<B> Next:</B> <A NAME="tex2html1631"
|
||||
HREF="node112.html">Error handling</A>
|
||||
<B> Up:</B> <A NAME="tex2html1627"
|
||||
HREF="node95.html">Parallel environment routines</A>
|
||||
<B> Previous:</B> <A NAME="tex2html1623"
|
||||
HREF="node110.html">psb_snd Send</A>
|
||||
<B> <A NAME="tex2html1629"
|
||||
HREF="node1.html">Contents</A></B>
|
||||
<!--End of Navigation Panel-->
|
||||
|
||||
|
||||
Reference in New Issue
Block a user