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    thread_t *t;

    link_t *cur;

    klog_printf("task %llu", ta->taskid);

    if (ta->dt_state == UDEBUG_TS_BEGINNING &&

        ta->dt_state != UDEBUG_TS_ACTIVE) {

        spinlock_unlock(&ta->lock);

        interrupts_restore(ipl);

        klog_printf("udebug_rp_begin(): task not being debugged");

        return EINVAL;

    }

    /* Finish debugging of all userspace threads */

    for (cur = ta->th_head.next; cur != &ta->th_head; cur = cur->next) {

        t = list_get_instance(cur, thread_t, th_link);

        spinlock_lock(&t->debug_lock);

        spinlock_lock(&t->lock);

        flags = t->flags;

        spinlock_unlock(&t->lock);

        /* Only process userspace threads */

        if ((flags & THREAD_FLAG_USPACE) != 0) {

            /* Prevent any further debug activity in thread */

            t->cur_event = 0;   /* none */

            /* Still has go? */

            if (t->debug_stop == false) {

                /*

                * Yes, so clear go. As debug_active == false,

                 * this doesn't affect anything.

                 */

                t->debug_stop = true;  

                /* Answer GO call */

                klog_printf("answer GO call with EVENT_FINISHED");

                IPC_SET_RETVAL(t->debug_go_call->data, 0);

                IPC_SET_ARG1(t->debug_go_call->data, UDEBUG_EVENT_FINISHED);

                ipc_answer(&ta->answerbox, t->debug_go_call);

            } else {

                /*

                 * Debug_stop is already at initial value.

                 * Yet this means the thread needs waking up.

                 */

                /*

                 * t's lock must not be held when calling

                 * waitq_wakeup.

                 */

                waitq_wakeup(&t->go_wq, WAKEUP_FIRST);

            }

        }

        spinlock_unlock(&t->debug_lock);

    }