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### E.17 Thread List Format

To efficiently update the list of threads and their attributes, GDB issues the ‘`qXfer:threads:read`’ packet (see qXfer threads read) and obtains the XML document with the following structure:

    <?xml version="1.0"?>
    <threads>
        <thread id="id" core="0" name="name">
        ... description ...
        </thread>
    </threads>

Each ‘`thread`’ element must have the ‘`id`’ attribute that identifies the thread (see thread-id syntax). The ‘`core`’ attribute, if present, specifies which processor core the thread was last executing on. The ‘`name`’ attribute, if present, specifies the human-readable name of the thread. The content of the of ‘`thread`’ element is interpreted as human-readable auxiliary information.