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    if (atomic_get(&CPU->nrdy) == 0) {
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    if (atomic_get(&CPU->nrdy) == 0) {
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        /*
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        /*
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         * For there was nothing to run, the CPU goes to sleep
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         * For there was nothing to run, the CPU goes to sleep
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         * until a hardware interrupt or an IPI comes.
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         * until a hardware interrupt or an IPI comes.
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         * This improves energy saving and hyperthreading.
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         * This improves energy saving and hyperthreading.
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         *
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         * - we might get an interrupt here that makes some thread runnable,
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         *   in such a case we must wait for the next quantum to come
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         */
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         */
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        /*
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         * An interrupt might occur right now and wake up a thread.
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         * In such case, the CPU will continue to go to sleep
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         * even though there is a runnable thread.
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         */
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         cpu_sleep();
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         cpu_sleep();
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         goto loop;
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         goto loop;
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    }
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    }
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    interrupts_disable();
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    interrupts_disable();