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<head><title>Error handling</title>
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<h3 class="sectionHead"><span class="titlemark">8 </span> <a
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id="x86-1230008"></a>Error handling</h3>
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<!--l. 5--><p class="noindent" >The PSBLAS library error handling policy has been completely rewritten in version
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2.0. The idea behind the design of this new error handling strategy is to keep error
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messages on a stack allowing the user to trace back up to the point where the first
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error message has been generated. Every routine in the PSBLAS-2.0 library has, as
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last non-optional argument, an integer <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">info</span></span></span> variable; whenever, inside the routine, an
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error is detected, this variable is set to a value corresponding to a specific
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error code. Then this error code is also pushed on the error stack and then
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either control is returned to the caller routine or the execution is aborted,
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depending on the users choice. At the time when the execution is aborted,
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an error message is printed on standard output with a level of verbosity
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than can be chosen by the user. If the execution is not aborted, then, the
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caller routine checks the value returned in the <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">info</span></span></span> variable and, if not
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zero, an error condition is raised. This process continues on all the levels of
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nested calls until the level where the user decides to abort the program
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execution.
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<!--l. 23--><p class="indent" > Figure <a
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href="#x86-1230259">9<!--tex4ht:ref: fig:routerr --></a> shows the layout of a generic <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">psb_foo</span></span></span> routine with respect to the
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PSBLAS-2.0 error handling policy. It is possible to see how, whenever an error
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condition is detected, the <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">info</span></span></span> variable is set to the corresponding error code which
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is, then, pushed on top of the stack by means of the <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">psb_errpush</span></span></span>. An error condition
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may be directly detected inside a routine or indirectly checking the error code
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returned returned by a called routine. Whenever an error is encountered, after it has
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been pushed on stack, the program execution skips to a point where the error
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condition is handled; the error condition is handled either by returning control to the
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caller routine or by calling the <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">psb\_error</span></span></span> routine which prints the content of
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the error stack and aborts the program execution, according to the choice
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made by the user with <span class="obeylines-h"><span class="verb"><span
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class="cmtt-10">psb_set_erraction</span></span></span>. 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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<!--l. 40--><p class="indent" > <hr class="figure"><div class="figure"
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>
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<a
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id="x86-1230259"></a>
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<div class="center"
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>
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<!--l. 73--><p class="noindent" >
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<div class="fbox"><div class="minipage"><!--l. 44-->
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<div class="lstlisting" id="listing-9"><span class="label"><a
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id="x86-123001r1"></a></span><span
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class="cmbx-9">subroutine</span><span
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class="cmr-9"> </span><span
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class="cmr-9">psb</span><span
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class="cmr-9">_foo</span><span
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class="cmr-9">(</span><span
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class="cmr-9">some</span><span
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class="cmr-9"> </span><span
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class="cmr-9">args</span><span
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class="cmr-9">,</span><span
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class="cmr-9"> </span><span
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class="cmr-9">info</span><span
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class="cmr-9">)</span><span
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class="cmr-9"> </span><br /><span class="label"><a
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id="x86-123002r2"></a></span><span
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class="cmr-9"> </span><span
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class="cmr-9"> </span><span
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class="cmr-9"> </span><span
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class="cmr-9">...</span><span
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class="cmr-9"> </span><br /><span class="label"><a
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id="x86-123003r3"></a></span><span
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|
class="cmr-9"> </span><span
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|
class="cmr-9"> </span><span
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|
class="cmr-9"> </span><span
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class="cmbx-9">if</span><span
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class="cmr-9">(</span><span
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class="cmr-9">error</span><span
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class="cmr-9"> </span><span
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class="cmr-9">detected</span><span
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class="cmr-9">)</span><span
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class="cmr-9"> </span><span
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class="cmbx-9">then</span><span
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class="cmr-9"> </span><br /><span class="label"><a
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id="x86-123004r4"></a></span><span
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|
class="cmr-9"> </span><span
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|
class="cmr-9"> </span><span
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class="cmr-9"> </span><span
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class="cmr-9"> </span><span
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|
class="cmr-9"> </span><span
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|
class="cmr-9"> </span><span
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|
class="cmr-9">info</span><span
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class="cmr-9">=</span><span
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class="cmr-9">errcode1</span><span
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|
class="cmr-9"> </span><br /><span class="label"><a
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id="x86-123005r5"></a></span><span
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class="cmr-9"> </span><span
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|
class="cmr-9"> </span><span
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|
class="cmr-9"> </span><span
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|
class="cmr-9"> </span><span
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|
class="cmr-9"> </span><span
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|
class="cmr-9"> </span><span
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|
class="cmbx-9">call</span><span
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class="cmr-9"> </span><span
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class="cmr-9">psb</span><span
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class="cmr-9">_errpush</span><span
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|
class="cmr-9">(</span><span
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|
class="cmr-9">’</span><span
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|
class="cmr-9">psb</span><span
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|
class="cmr-9">_foo</span><span
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|
class="cmr-9">’</span><span
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class="cmr-9">,</span><span
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|
class="cmr-9"> </span><span
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|
class="cmr-9">errcode1</span><span
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|
class="cmr-9">)</span><span
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|
class="cmr-9"> </span><br /><span class="label"><a
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|
id="x86-123006r6"></a></span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
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|
|
|
class="cmr-9"> </span><span
|
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|
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|
class="cmr-9"> </span><span
|
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|
class="cmr-9"> </span><span
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|
class="cmr-9"> </span><span
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|
class="cmr-9"> </span><span
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|
|
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|
class="cmbx-9">goto</span><span
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|
class="cmr-9"> </span><span
|
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|
class="cmr-9">9999</span><span
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|
class="cmr-9"> </span><br /><span class="label"><a
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|
id="x86-123007r7"></a></span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
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|
|
|
class="cmr-9"> </span><span
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|
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|
class="cmr-9"> </span><span
|
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|
|
|
class="cmbx-9">end</span><span
|
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|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmbx-9">if</span><span
|
|
|
|
|
class="cmr-9"> </span><br /><span class="label"><a
|
|
|
|
|
id="x86-123008r8"></a></span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9">...</span><span
|
|
|
|
|
class="cmr-9"> </span><br /><span class="label"><a
|
|
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|
|
id="x86-123009r9"></a></span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmbx-9">call</span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9">psb</span><span
|
|
|
|
|
class="cmr-9">_bar</span><span
|
|
|
|
|
class="cmr-9">(</span><span
|
|
|
|
|
class="cmr-9">some</span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9">args</span><span
|
|
|
|
|
class="cmr-9">,</span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9">info</span><span
|
|
|
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|
class="cmr-9">)</span><span
|
|
|
|
|
class="cmr-9"> </span><br /><span class="label"><a
|
|
|
|
|
id="x86-123010r10"></a></span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmbx-9">if</span><span
|
|
|
|
|
class="cmr-9">(</span><span
|
|
|
|
|
class="cmr-9">info</span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9">.</span><span
|
|
|
|
|
class="cmbx-9">ne</span><span
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|
class="cmr-9">.</span><span
|
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|
|
|
class="cmr-9"> </span><span
|
|
|
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|
class="cmr-9">zero</span><span
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|
class="cmr-9">)</span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
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|
class="cmbx-9">then</span><span
|
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|
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|
class="cmr-9"> </span><br /><span class="label"><a
|
|
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|
|
id="x86-123011r11"></a></span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9">info</span><span
|
|
|
|
|
class="cmr-9">=</span><span
|
|
|
|
|
class="cmr-9">errcode2</span><span
|
|
|
|
|
class="cmr-9"> </span><br /><span class="label"><a
|
|
|
|
|
id="x86-123012r12"></a></span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmbx-9">call</span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9">psb</span><span
|
|
|
|
|
class="cmr-9">_errpush</span><span
|
|
|
|
|
class="cmr-9">(</span><span
|
|
|
|
|
class="cmr-9">’</span><span
|
|
|
|
|
class="cmr-9">psb</span><span
|
|
|
|
|
class="cmr-9">_foo</span><span
|
|
|
|
|
class="cmr-9">’</span><span
|
|
|
|
|
class="cmr-9">,</span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9">errcode2</span><span
|
|
|
|
|
class="cmr-9">)</span><span
|
|
|
|
|
class="cmr-9"> </span><br /><span class="label"><a
|
|
|
|
|
id="x86-123013r13"></a></span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmbx-9">goto</span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9">9999</span><span
|
|
|
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|
class="cmr-9"> </span><br /><span class="label"><a
|
|
|
|
|
id="x86-123014r14"></a></span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
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|
|
class="cmr-9"> </span><span
|
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|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmbx-9">end</span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmbx-9">if</span><span
|
|
|
|
|
class="cmr-9"> </span><br /><span class="label"><a
|
|
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|
id="x86-123015r15"></a></span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
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|
class="cmr-9"> </span><span
|
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|
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|
class="cmr-9">...</span><span
|
|
|
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class="cmr-9"> </span><br /><span class="label"><a
|
|
|
|
|
id="x86-123016r16"></a></span><span
|
|
|
|
|
class="cmr-9">9999</span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmbx-9">continue</span><span
|
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class="cmr-9"> </span><br /><span class="label"><a
|
|
|
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|
id="x86-123017r17"></a></span><span
|
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|
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|
class="cmr-9"> </span><span
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class="cmr-9"> </span><span
|
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class="cmr-9"> </span><span
|
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class="cmbx-9">if</span><span
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class="cmr-9"> </span><span
|
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class="cmr-9">(</span><span
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class="cmr-9">err</span><span
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class="cmr-9">_act</span><span
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class="cmr-9"> </span><span
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class="cmr-9">.</span><span
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class="cmbx-9">eq</span><span
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class="cmr-9">.</span><span
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class="cmr-9"> </span><span
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class="cmr-9">act</span><span
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class="cmr-9">_abort</span><span
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class="cmr-9">)</span><span
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class="cmr-9"> </span><span
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class="cmbx-9">then</span><span
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class="cmr-9"> </span><br /><span class="label"><a
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id="x86-123018r18"></a></span><span
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class="cmr-9"> </span><span
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class="cmr-9"> </span><span
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class="cmr-9"> </span><span
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class="cmr-9"> </span><span
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class="cmr-9"> </span><span
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class="cmbx-9">call</span><span
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class="cmr-9"> </span><span
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class="cmr-9">psb</span><span
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class="cmr-9">_error</span><span
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class="cmr-9">(</span><span
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class="cmr-9">icontxt</span><span
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class="cmr-9">)</span><span
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class="cmr-9"> </span><br /><span class="label"><a
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id="x86-123019r19"></a></span><span
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class="cmr-9"> </span><span
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class="cmr-9"> </span><span
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class="cmr-9"> </span><span
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class="cmr-9"> </span><span
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class="cmr-9"> </span><span
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class="cmbx-9">return</span><span
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class="cmr-9"> </span><br /><span class="label"><a
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id="x86-123020r20"></a></span><span
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class="cmr-9"> </span><span
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class="cmr-9"> </span><span
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class="cmr-9"> </span><span
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class="cmbx-9">else</span><span
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class="cmr-9"> </span><br /><span class="label"><a
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id="x86-123021r21"></a></span><span
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class="cmr-9"> </span><span
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class="cmr-9"> </span><span
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class="cmr-9"> </span><span
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class="cmr-9"> </span><span
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class="cmr-9"> </span><span
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class="cmbx-9">return</span><span
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|
class="cmr-9"> </span><br /><span class="label"><a
|
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|
id="x86-123022r22"></a></span><span
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|
class="cmr-9"> </span><span
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|
class="cmr-9"> </span><span
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|
class="cmr-9"> </span><span
|
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|
|
|
class="cmbx-9">end</span><span
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|
class="cmr-9"> </span><span
|
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class="cmbx-9">if</span><span
|
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class="cmr-9"> </span><br /><span class="label"><a
|
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id="x86-123023r23"></a></span><span
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class="cmr-9"> </span><br /><span class="label"><a
|
|
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|
|
id="x86-123024r24"></a></span><span
|
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|
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class="cmbx-9">end</span><span
|
|
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|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmbx-9">subroutine</span><span
|
|
|
|
|
class="cmr-9"> </span><span
|
|
|
|
|
class="cmr-9">psb</span><span
|
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|
|
class="cmr-9">_foo</span>
|
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|
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|
</div> </div> </div>
|
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|
|
</div>
|
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|
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|
<br /> <div class="caption"
|
|
|
|
|
><span class="id">Figure 9: </span><span
|
|
|
|
|
class="content">The layout of a generic <span
|
|
|
|
|
class="cmtt-10">psb</span><span
|
|
|
|
|
class="cmtt-10">_foo </span>routine with respect to PSBLAS-2.0
|
|
|
|
|
error handling policy.</span></div><!--tex4ht:label?: x86-1230259 -->
|
|
|
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|
|
<!--l. 78--><p class="indent" > </div><hr class="endfigure">
|
|
|
|
|
<!--l. 83--><p class="indent" > Figure <a
|
|
|
|
|
href="#x86-12302610">10<!--tex4ht:ref: fig:errormsg --></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 <span class="obeylines-h"><span class="verb"><span
|
|
|
|
|
class="cmtt-10">psb_cest</span></span></span> subroutine called by <span class="obeylines-h"><span class="verb"><span
|
|
|
|
|
class="cmtt-10">psb_spasb</span></span></span> ... by process 0 (i.e. the root
|
|
|
|
|
process).
|
|
|
|
|
<!--l. 91--><p class="indent" > <hr class="figure"><div class="figure"
|
|
|
|
|
>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<a
|
|
|
|
|
id="x86-12302610"></a>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<div class="center"
|
|
|
|
|
>
|
|
|
|
|
<!--l. 113--><p class="noindent" >
|
|
|
|
|
<div class="fbox"><div class="minipage"><div class="verbatim" id="verbatim-101">
|
|
|
|
|
==========================================================
|
|
|
|
|
 <br />Process: 0.  PSBLAS Error (4010) in subroutine: df_sample
|
|
|
|
|
 <br />Error from call to subroutine mat dist
|
|
|
|
|
 <br />==========================================================
|
|
|
|
|
 <br />Process: 0.  PSBLAS Error (4010) in subroutine: mat_distv
|
|
|
|
|
 <br />Error from call to subroutine psb_spasb
|
|
|
|
|
 <br />==========================================================
|
|
|
|
|
 <br />Process: 0.  PSBLAS Error (4010) in subroutine: psb_spasb
|
|
|
|
|
 <br />Error from call to subroutine psb_cest
|
|
|
|
|
 <br />==========================================================
|
|
|
|
|
 <br />Process: 0.  PSBLAS Error (136) in subroutine: psb_cest
|
|
|
|
|
 <br />Format FOO is unknown
|
|
|
|
|
 <br />==========================================================
|
|
|
|
|
 <br />Aborting...
|
|
|
|
|
</div>
|
|
|
|
|
<!--l. 109--><p class="nopar" > </div> </div>
|
|
|
|
|
</div>
|
|
|
|
|
<br /> <div class="caption"
|
|
|
|
|
><span class="id">Figure 10: </span><span
|
|
|
|
|
class="content">A sample PSBLAS-2.0 error message. Process 0 detected an error
|
|
|
|
|
condition inside the psb_cest subroutine</span></div><!--tex4ht:label?: x86-12302610 -->
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<!--l. 119--><p class="indent" > </div><hr class="endfigure">
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
<div class="subsectionTOCS">
|
|
|
|
|
 <span class="subsectionToc" >8.1 <a
|
|
|
|
|
href="userhtmlsu74.html#x87-1240008.1">psb_errpush — Pushes an error code onto the error stack</a></span>
|
|
|
|
|
<br />  <span class="subsectionToc" >8.2 <a
|
|
|
|
|
href="userhtmlsu75.html#x88-1250008.2">psb_error — Prints the error stack content and aborts execution</a></span>
|
|
|
|
|
<br />  <span class="subsectionToc" >8.3 <a
|
|
|
|
|
href="userhtmlsu76.html#x89-1260008.3">psb_set_errverbosity — Sets the verbosity of error messages</a></span>
|
|
|
|
|
<br />  <span class="subsectionToc" >8.4 <a
|
|
|
|
|
href="userhtmlsu77.html#x90-1270008.4">psb_set_erraction — Set the type of action to be taken upon error condition</a></span>
|
|
|
|
|
</div>
|
|
|
|
|
|
|
|
|
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|
|
<!--l. 1--><div class="crosslinks"><p class="noindent">[<a
|
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|
href="userhtmlsu80.html" >next</a>] [<a
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href="userhtmlse7.html" >prev</a>] [<a
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href="userhtmlse7.html#tailuserhtmlse7.html" >prev-tail</a>] [<a
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href="userhtmlse8.html" >front</a>] [<a
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href="userhtml.html#userhtmlsu76.html" >up</a>] </p></div>
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