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<a name="Thread-List-Format-1"></a>
<h3 class="section">E.17 Thread List Format</h3>
<a name="index-thread-list-format"></a>

<p>To efficiently update the list of threads and their attributes,
<small>GDB</small> issues the &lsquo;<samp>qXfer:threads:read</samp>&rsquo; packet
(see <a href="General-Query-Packets.html#qXfer-threads-read">qXfer threads read</a>) and obtains the XML document with
the following structure:
</p>
<div class="smallexample">
<pre class="smallexample">&lt;?xml version=&quot;1.0&quot;?&gt;
&lt;threads&gt;
    &lt;thread id=&quot;id&quot; core=&quot;0&quot; name=&quot;name&quot;&gt;
    ... description ...
    &lt;/thread&gt;
&lt;/threads&gt;
</pre></div>

<p>Each &lsquo;<samp>thread</samp>&rsquo; element must have the &lsquo;<samp>id</samp>&rsquo; attribute that
identifies the thread (see <a href="Packets.html#thread_002did-syntax">thread-id syntax</a>).  The
&lsquo;<samp>core</samp>&rsquo; attribute, if present, specifies which processor core
the thread was last executing on.  The &lsquo;<samp>name</samp>&rsquo; attribute, if
present, specifies the human-readable name of the thread.  The content
of the of &lsquo;<samp>thread</samp>&rsquo; element is interpreted as human-readable
auxiliary information.  The &lsquo;<samp>handle</samp>&rsquo; attribute, if present,
is a hex encoded representation of the thread handle.
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