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/** Kernel-side futex structure. */
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/** Kernel-side futex structure. */
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struct futex {
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struct futex {
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    __address paddr;    /**< Physical address of the status variable. */
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    __address paddr;    /**< Physical address of the status variable. */
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    waitq_t wq;     /**< Wait queue for threads waiting for futex availability. */
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    waitq_t wq;     /**< Wait queue for threads waiting for futex availability. */
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    link_t ht_link;     /**< Futex hash table link. */
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    link_t ht_link;     /**< Futex hash table link. */
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    count_t refcount;   /**< Number of tasks that reference this futex. */
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};
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};
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extern void futex_init(void);
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extern void futex_init(void);
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extern __native sys_futex_sleep_timeout(__address uaddr, __u32 usec, int trydown);
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extern __native sys_futex_sleep_timeout(__address uaddr, __u32 usec, int trydown);
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extern __native sys_futex_wakeup(__address uaddr);
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extern __native sys_futex_wakeup(__address uaddr);