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    and to the latter group as to userspace threads. Both kernel and userspace
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    and to the latter group as to userspace threads. Both kernel and userspace
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    threads are visible to the scheduler and can become a subject of kernel
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    threads are visible to the scheduler and can become a subject of kernel
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    preemption and thread migration during times when preemption is
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    preemption and thread migration during times when preemption is
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    possible.</para>
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    possible.</para>
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    <para>
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    <mediaobject id="thread_states" xreflabel="">
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        <imageobject role="html">
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           <imagedata fileref="images/thread_states.png" format="PNG" />
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    </imageobject>
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    <imageobject role="fop">
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            <imagedata fileref="images.vector/thread_states.svg" format="SVG" />
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    </imageobject>
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    <caption>Transitions among thread states.</caption>
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    </mediaobject>
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     </para>
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    <para>HelenOS userspace layer knows even smaller units of execution. Each
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    <para>HelenOS userspace layer knows even smaller units of execution. Each
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    userspace thread can make use of an arbitrary number of pseudo threads.
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    userspace thread can make use of an arbitrary number of pseudo threads.
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    These pseudo threads have their own synchronous register context,
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    These pseudo threads have their own synchronous register context,
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    userspace code and stack. They live their own life within the userspace
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    userspace code and stack. They live their own life within the userspace
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    thread and the scheduler does not have any idea about them because they
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    thread and the scheduler does not have any idea about them because they