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    /*
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    /*
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     * To avoid lock ordering problems,
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     * To avoid lock ordering problems,
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     * run all expired timeouts as you visit them.
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     * run all expired timeouts as you visit them.
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     */
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     */
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    spinlock_lock(&the->cpu->timeoutlock);
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    spinlock_lock(&CPU->timeoutlock);
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    while ((l = the->cpu->timeout_active_head.next) != &the->cpu->timeout_active_head) {
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    while ((l = CPU->timeout_active_head.next) != &CPU->timeout_active_head) {
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        h = list_get_instance(l, timeout_t, link);
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        h = list_get_instance(l, timeout_t, link);
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        spinlock_lock(&h->lock);
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        spinlock_lock(&h->lock);
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        if (h->ticks-- != 0) {
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        if (h->ticks-- != 0) {
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            spinlock_unlock(&h->lock);
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            spinlock_unlock(&h->lock);
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            break;
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            break;
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        list_remove(l);
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        list_remove(l);
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        f = h->handler;
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        f = h->handler;
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        arg = h->arg;
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        arg = h->arg;
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        timeout_reinitialize(h);
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        timeout_reinitialize(h);
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        spinlock_unlock(&h->lock); 
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        spinlock_unlock(&h->lock); 
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        spinlock_unlock(&the->cpu->timeoutlock);
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        spinlock_unlock(&CPU->timeoutlock);
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        f(arg);
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        f(arg);
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        spinlock_lock(&the->cpu->timeoutlock);
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        spinlock_lock(&CPU->timeoutlock);
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    }
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    }
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    spinlock_unlock(&the->cpu->timeoutlock);
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    spinlock_unlock(&CPU->timeoutlock);
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    /*
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    /*
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     * Do CPU usage accounting and find out whether to preempt the->thread.
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     * Do CPU usage accounting and find out whether to preempt THREAD.
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     */
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     */
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    if (the->thread) {
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    if (THREAD) {
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        spinlock_lock(&the->cpu->lock);
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        spinlock_lock(&CPU->lock);
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        the->cpu->needs_relink++;
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        CPU->needs_relink++;
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        spinlock_unlock(&the->cpu->lock);  
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        spinlock_unlock(&CPU->lock);   
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        spinlock_lock(&the->thread->lock);
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        spinlock_lock(&THREAD->lock);
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            if (!the->thread->ticks--) {
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            if (!THREAD->ticks--) {
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            spinlock_unlock(&the->thread->lock);
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            spinlock_unlock(&THREAD->lock);
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            scheduler();
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            scheduler();
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        }
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        }
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        else {
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        else {
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            spinlock_unlock(&the->thread->lock);
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            spinlock_unlock(&THREAD->lock);
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        }
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        }
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    }
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    }
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}
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}