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    /** Kernel answerbox */
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    /** Kernel answerbox */
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    answerbox_t kernel_box;
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    answerbox_t kernel_box;
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    /** Thread used to service kernel answerbox */
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    /** Thread used to service kernel answerbox */
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    struct thread *kb_thread;
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    struct thread *kb_thread;
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    /** Kbox thread creation vs. begin of cleanup mutual exclusion */
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    SPINLOCK_DECLARE(kb_cleanup_lock);
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    /** True if kb_thread != NULL or is being prepared */
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    /** True if cleanup of kbox has already started */
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    bool kb_finished;
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    /** Used for waiting on kbox thread shutdown */
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    bool kb_thread_at_hand;    
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    waitq_t kb_thread_shutdown_wq;
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    /** Architecture specific task data. */
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    /** Architecture specific task data. */
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    task_arch_t arch;
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    task_arch_t arch;
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    /**
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    /**