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{
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{
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    link_t *l;
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    link_t *l;
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    timeout_t *h;
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    timeout_t *h;
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    timeout_handler_t f;
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    timeout_handler_t f;
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    void *arg;
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    void *arg;
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    int i;
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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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    for (i = 0; i < CPU->missed_clock_ticks; i++) {
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    spinlock_lock(&CPU->timeoutlock);
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        spinlock_lock(&CPU->timeoutlock);
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    while ((l = CPU->timeout_active_head.next) != &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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        f(arg);
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            f(arg);
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        spinlock_lock(&CPU->timeoutlock);
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            spinlock_lock(&CPU->timeoutlock);
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    }
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        }
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    spinlock_unlock(&CPU->timeoutlock);
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        spinlock_unlock(&CPU->timeoutlock);
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    }
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    CPU->missed_clock_ticks = 0;
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    /*
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    /*
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     * Do CPU usage accounting and find out whether to preempt 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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