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    /** Wait queue for threads waiting for futex availability. */
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    /** Wait queue for threads waiting for futex availability. */
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    waitq_t wq;
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    waitq_t wq;
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    /** Futex hash table link. */
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    /** Futex hash table link. */
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    link_t ht_link;
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    link_t ht_link;
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    /** Number of tasks that reference this futex. */
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    /** Number of tasks that reference this futex. */
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    count_t refcount;
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    size_t refcount;
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} futex_t;
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} futex_t;
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extern void futex_init(void);
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extern void futex_init(void);
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extern unative_t sys_futex_sleep_timeout(uintptr_t uaddr, uint32_t usec,
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extern unative_t sys_futex_sleep_timeout(uintptr_t uaddr, uint32_t usec,
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    int flags);
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    int flags);