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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"> ... 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 content of the of `thread' element is interpreted as human-readable auxilliary information.