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<H2><A NAME="SECTION005420000000000000000">
3.4.2 Limitations and other considerations</A>
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<P>
Setting up a given processor to trap IEEE-754 floating point
errors currently requires custom code on a per-architecture basis.
You may have to modify <tt class="module">fpectl</tt> to control your particular hardware.

<P>
Conversion of an IEEE-754 exception to a Python exception requires
that the wrapper macros <code>PyFPE_START_PROTECT</code> and
<code>PyFPE_END_PROTECT</code> be inserted into your code in an appropriate
fashion.  Python itself has been modified to support the
<tt class="module">fpectl</tt> module, but many other codes of interest to numerical
analysts have not.

<P>
The <tt class="module">fpectl</tt> module is not thread-safe.

<P>
<div class="seealso">
  <p class="heading">See Also:</p>

  <div class="seetext"><p>Some files in the source distribution may be interesting in
           learning more about how this module operates.
           The include file <span class="file">Include/pyfpe.h</span> discusses the
           implementation of this module at some length.
           <span class="file">Modules/fpetestmodule.c</span> gives several examples of
           use.
           Many additional examples can be found in
           <span class="file">Objects/floatobject.c</span>.</p></div>
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<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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