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 * but only if it verifies all conditions.
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 * but only if it verifies all conditions.
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 *
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 *
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 * Specifically, verifies that thread t exists, is a userspace thread,
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 * Specifically, verifies that thread t exists, is a userspace thread,
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 * and belongs to the current task (TASK). Verifies, that the thread
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 * and belongs to the current task (TASK). Verifies, that the thread
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 * is (or is not) go according to being_go (typically false).
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 * is (or is not) go according to being_go (typically false).
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 * It also locks t->udebug.lock, making sure that t->udebug.debug_active
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 * It also locks t->udebug.lock, making sure that t->udebug.active
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 * is true - that the thread is in a valid debugging session.
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 * is true - that the thread is in a valid debugging session.
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 *
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 *
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 * With this verified and the t->udebug.lock mutex held, it is ensured
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 * With this verified and the t->udebug.lock mutex held, it is ensured
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 * that the thread cannot leave the debugging session, let alone cease
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 * that the thread cannot leave the debugging session, let alone cease
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 * to exist.
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 * to exist.
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        mutex_unlock(&TASK->udebug.lock);
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        mutex_unlock(&TASK->udebug.lock);
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        return ENOENT;
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        return ENOENT;
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    }
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    }
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    /* Verify debugging state. */
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    /* Verify debugging state. */
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    if (t->udebug.debug_active != true) {
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    if (t->udebug.active != true) {
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        /* Not in debugging session or undesired GO state */
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        /* Not in debugging session or undesired GO state */
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        spinlock_unlock(&t->lock);
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        spinlock_unlock(&t->lock);
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        interrupts_restore(ipl);
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        interrupts_restore(ipl);
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        mutex_unlock(&TASK->udebug.lock);
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        mutex_unlock(&TASK->udebug.lock);
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        return ENOENT;
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        return ENOENT;
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    }
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    }
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    /*
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    /*
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     * Since the thread has debug_active == true, TASK->udebug.lock
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     * Since the thread has active == true, TASK->udebug.lock
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     * is enough to ensure its existence and that debug_active remains
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     * is enough to ensure its existence and that active remains
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     * true.
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     * true.
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     */
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     */
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    spinlock_unlock(&t->lock);
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    spinlock_unlock(&t->lock);
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    interrupts_restore(ipl);
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    interrupts_restore(ipl);
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        reply = 1; /* immediate reply */
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        reply = 1; /* immediate reply */
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    } else {
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    } else {
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        reply = 0; /* no reply */
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        reply = 0; /* no reply */
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    }
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    }
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    /* Set udebug.debug_active on all of the task's userspace threads. */
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    /* Set udebug.active on all of the task's userspace threads. */
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    for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) {
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    for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) {
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        t = list_get_instance(cur, thread_t, th_link);
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        t = list_get_instance(cur, thread_t, th_link);
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        mutex_lock(&t->udebug.lock);
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        mutex_lock(&t->udebug.lock);
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        if ((t->flags & THREAD_FLAG_USPACE) != 0)
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        if ((t->flags & THREAD_FLAG_USPACE) != 0)
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            t->udebug.debug_active = true;
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            t->udebug.active = true;
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        mutex_unlock(&t->udebug.lock);
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        mutex_unlock(&t->udebug.lock);
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    }
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    }
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    mutex_unlock(&TASK->udebug.lock);
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    mutex_unlock(&TASK->udebug.lock);
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