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<H1><A NAME="SECTION00090000000000000000">
Error handling</A>
</H1>
<H2><A NAME="SECTION000815000000000000000">
psb_snd -- Send data</A>
</H2>
<P>
The PSBLAS library error handling policy has been completely rewritten
in version 2.0. The idea behind the design of this new error handling
strategy is to keep error messages on a stack allowing the user to
trace back up to the point where the first error message has been
generated. Every routine in the PSBLAS-2.0 library has, as last
non-optional argument, an integer <code>info</code> variable; whenever,
inside the routine, an error is detected, this variable is set to a
value corresponding to a specific error code. Then this error code is
also pushed on the error stack and then either control is returned to
the caller routine or the execution is aborted, depending on the users
choice. At the time when the execution is aborted, an error message is
printed on standard output with a level of verbosity than can be
chosen by the user. If the execution is not aborted, then, the caller
routine checks the value returned in the <code>info</code> variable and, if
not zero, an error condition is raised. This process continues on all the
levels of nested calls until the level where the user decides to abort
the program execution.
<P>
Figure&nbsp;<A HREF="#fig:routerr">9</A> shows the layout of a generic <code>psb_foo</code>
routine with respect to the PSBLAS-2.0 error handling policy. It is
possible to see how, whenever an error condition is detected, the
<code>info</code> variable is set to the corresponding error code which is,
then, pushed on top of the stack by means of the
<code>psb_errpush</code>. An error condition may be directly detected inside
a routine or indirectly checking the error code returned returned by a
called routine. Whenever an error is encountered, after it has been
pushed on stack, the program execution skips to a point where the
error condition is handled; the error condition is handled either by
returning control to the caller routine or by calling the
<code>psb\_error</code> routine which prints the content of the error stack
and aborts the program execution, according to the choice made by the
user with <code>psb_set_erraction</code>. The default is to print the error
and terminate the program, but the user may choose to handle the error
explicitly.
<P>
<DIV ALIGN="CENTER"><A NAME="fig:routerr"></A><A NAME="7135"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 9:</STRONG>
The layout of a generic <TT>psb_foo</TT>
routine with respect to PSBLAS-2.0 error handling policy.</CAPTION>
<TR><TD>
<BR>
<DIV ALIGN="CENTER">
<!-- MATH
$\fbox{\TheSbox}$
-->
<IMG
WIDTH="562" HEIGHT="482" ALIGN="MIDDLE" BORDER="0"
SRC="img142.png"
ALT="\fbox{\TheSbox}">
</DIV></TD></TR>
</TABLE>
</DIV>
<P>
Figure&nbsp;<A HREF="#fig:errormsg">10</A> reports a sample error message generated by
the PSBLAS-2.0 library. This error has been generated by the fact that
the user has chosen the invalid ``FOO'' storage format to represent
the sparse matrix. From this error message it is possible to see that
the error has been detected inside the <code>psb_cest</code> subroutine
called by <code>psb_spasb</code> ... by process 0 (i.e. the root process).
<P>
<DIV ALIGN="CENTER"><A NAME="fig:errormsg"></A><A NAME="7136"></A>
<TABLE>
<CAPTION ALIGN="BOTTOM"><STRONG>Figure 10:</STRONG>
A sample PSBLAS-2.0 error
message. Process 0 detected an error condition inside the psb_cest subroutine</CAPTION>
<TR><TD>
<BR>
<DIV ALIGN="CENTER">
<!-- MATH
$\fbox{\TheSbox}$
-->
<IMG
WIDTH="562" HEIGHT="482" ALIGN="MIDDLE" BORDER="0"
SRC="img142.png"
ALT="\fbox{\TheSbox}">
</DIV></TD></TR>
</TABLE>
</DIV>
<P>
ifstarsubroutinesubroutinepsb_errpushPushes an error code onto the error
stack
<P>
<BR>
<IMG
WIDTH="423" HEIGHT="16" ALIGN="BOTTOM" BORDER="0"
SRC="img144.png"
ALT="\begin{lstlisting}
call psb_errpush(err_c, r_name, i_err, a_err)
\end{lstlisting}">
<BR>
<PRE>
call psb_snd(icontxt, dat, dst, m)
</PRE>
<P>
This subroutine sends a packet of data to a destination.
<DL>
<DT><STRONG>Type:</STRONG></DT>
<DD>Asynchronous.
<DD>Synchronous: see usage notes.
</DD>
<DT><STRONG><B>On Entry</B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>err_c</STRONG></DT>
<DD>the error code
<BR>
Scope: <B>local</B>
<BR>
Type: <B>required</B>
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer.
</DD>
<DT><STRONG>r_name</STRONG></DT>
<DD>the soutine where the error has been caught.
<BR>
Scope: <B>local</B>
<BR>
Type: <B>required</B>
<BR>
Intent: <B>in</B>.
<BR>
Specified as: a string.
<BR></DD>
<DT><STRONG>i_err</STRONG></DT>
<DD>addional info for error code
<BR>
Scope: <B>local</B>
<BR>
Type: <B>optional</B>
<BR>
Specified as: an integer array
<BR></DD>
<DT><STRONG>a_err</STRONG></DT>
<DD>addional info for error code
<BR>
Scope: <B>local</B>
<BR>
Type: <B>optional</B>
<BR>
Specified as: a string.
<BR></DD>
</DL>
<P>
ifstarsubroutinesubroutinepsb_errorPrints the error stack content and aborts
execution
<P>
<BR>
<IMG
WIDTH="214" HEIGHT="16" ALIGN="BOTTOM" BORDER="0"
SRC="img145.png"
ALT="\begin{lstlisting}
call psb_error(icontxt)
\end{lstlisting}">
<BR>
<P>
<DL>
<DT><STRONG>Type:</STRONG></DT>
<DD>Asynchronous.
</DD>
<DT><STRONG><B>On Entry</B></STRONG></DT>
<DT><STRONG><B>On Entry </B></STRONG></DT>
<DD>
</DD>
<DT><STRONG>icontxt</STRONG></DT>
<DD>the communication context.
<DD>the communication context identifying the virtual
parallel machine.
<BR>
Scope: <B>global</B>
Scope: <B>global</B>.
<BR>
Type: <B>optional</B>
Type: <B>required</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer.
Specified as: an integer variable.
</DD>
<DT><STRONG>dat</STRONG></DT>
<DD>The data to be sent.
<BR>
Scope: <B>local</B>.
<BR>
Type: <B>required</B>.
<BR>
Intent: <B>in</B>.
<BR>
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="14" ALIGN="BOTTOM" BORDER="0"
SRC="img133.png"
ALT="$m$"> is
not specified, size must agree as well.
</DD>
<DT><STRONG>dst</STRONG></DT>
<DD>Destination process.
<BR>
Scope: <B>global</B>.
<BR>
Type: <B>required</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer value <!-- MATH
$0<= dst <= np-1$
-->
<IMG
WIDTH="145" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
SRC="img134.png"
ALT="$0&lt;= dst &lt;= np-1$">.
<BR></DD>
<DT><STRONG>m</STRONG></DT>
<DD>Number of rows.
<BR>
Scope: <B>global</B>.
<BR>
Type: <B>Optional</B>.
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer value <!-- MATH
$0<= m <= size(dat,1)$
-->
<IMG
WIDTH="172" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
SRC="img135.png"
ALT="$0&lt;= m &lt;= size(dat,1)$">.
<BR>
When <IMG
WIDTH="26" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
SRC="img136.png"
ALT="$dat$"> is a rank 2 array, specifies the number of rows to be sent
independently of the leading dimension <IMG
WIDTH="83" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
SRC="img137.png"
ALT="$size(dat,1)$">; must have the
same value on sending and receiving processes.
</DD>
</DL>
<P>
ifstarsubroutinesubroutinepsb_set_errverbositySets the verbosity of error
messages.
<P>
<BR>
<IMG
WIDTH="261" HEIGHT="16" ALIGN="BOTTOM" BORDER="0"
SRC="img146.png"
ALT="\begin{lstlisting}
call psb_set_errverbosity(v)
\end{lstlisting}">
<BR>
<P>
<DL>
<DT><STRONG>Type:</STRONG></DT>
<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
<BR>
Scope: <B>global</B>
<BR>
Type: <B>required</B>
<BR>
Intent: <B>in</B>.
<BR>
Specified as: an integer.
</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="291" HEIGHT="16" ALIGN="BOTTOM" BORDER="0"
SRC="img147.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 destination process <IMG
WIDTH="25" HEIGHT="15" ALIGN="BOTTOM" BORDER="0"
SRC="img138.png"
ALT="$dst$">.
</LI>
</OL>
<P>
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