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<H1><A NAME="SECTION0010300000000000000000"></A><A NAME="advanced-debugging"></A>
<BR>
8.3 Advanced Debugger Support
</H1>

<P>
These functions are only intended to be used by advanced debugging
tools.

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyInterpreterState*&nbsp;<b><tt id='l2h-891' xml:id='l2h-891' class="cfunction">PyInterpreterState_Head</tt></b>(</nobr></td><td>)</td></tr></table></dt>
<dd>
  Return the interpreter state object at the head of the list of all
  such objects.

<span class="versionnote">New in version 2.2.</span>

</dd></dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyInterpreterState*&nbsp;<b><tt id='l2h-892' xml:id='l2h-892' class="cfunction">PyInterpreterState_Next</tt></b>(</nobr></td><td>PyInterpreterState *<var>interp</var>)</td></tr></table></dt>
<dd>
  Return the next interpreter state object after <var>interp</var> from the
  list of all such objects.

<span class="versionnote">New in version 2.2.</span>

</dd></dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyThreadState *&nbsp;<b><tt id='l2h-893' xml:id='l2h-893' class="cfunction">PyInterpreterState_ThreadHead</tt></b>(</nobr></td><td>PyInterpreterState *<var>interp</var>)</td></tr></table></dt>
<dd>
  Return the a pointer to the first <tt class="ctype">PyThreadState</tt> object in
  the list of threads associated with the interpreter <var>interp</var>.

<span class="versionnote">New in version 2.2.</span>

</dd></dl>

<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"><td><nobr>PyThreadState*&nbsp;<b><tt id='l2h-894' xml:id='l2h-894' class="cfunction">PyThreadState_Next</tt></b>(</nobr></td><td>PyThreadState *<var>tstate</var>)</td></tr></table></dt>
<dd>
  Return the next thread state object after <var>tstate</var> from the list
  of all such objects belonging to the same <tt class="ctype">PyInterpreterState</tt>
  object.

<span class="versionnote">New in version 2.2.</span>

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<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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