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    /** Lock protecting wait queue structure.
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    /** Lock protecting wait queue structure.
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     *
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     *
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     * Must be acquired before T.lock for each T of type thread_t.
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     * Must be acquired before T.lock for each T of type thread_t.
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     */
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     */
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    spinlock_t lock;
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    SPINLOCK_DECLARE(lock);
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    int missed_wakeups; /**< Number of waitq_wakeup() calls that didn't find a thread to wake up. */
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    int missed_wakeups; /**< Number of waitq_wakeup() calls that didn't find a thread to wake up. */
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    link_t head;        /**< List of sleeping threads for wich there was no missed_wakeup. */
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    link_t head;        /**< List of sleeping threads for wich there was no missed_wakeup. */
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};
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};
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