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#define us2ticks(us)    ((uint64_t)(((uint32_t) (us)/(1000000/HZ))))
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#define us2ticks(us)    ((uint64_t)(((uint32_t) (us)/(1000000/HZ))))
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typedef void (* timeout_handler_t)(void *arg);
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typedef void (* timeout_handler_t)(void *arg);
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struct timeout {
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typedef struct {
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    SPINLOCK_DECLARE(lock);
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    SPINLOCK_DECLARE(lock);
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    link_t link;            /**< Link to the list of active timeouts on THE->cpu */
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    link_t link;            /**< Link to the list of active timeouts on THE->cpu */
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    uint64_t ticks;         /**< Timeout will be activated in this amount of clock() ticks. */
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    uint64_t ticks;         /**< Timeout will be activated in this amount of clock() ticks. */
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    timeout_handler_t handler;  /**< Function that will be called on timeout activation. */
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    timeout_handler_t handler;  /**< Function that will be called on timeout activation. */
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    void *arg;          /**< Argument to be passed to handler() function. */
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    void *arg;          /**< Argument to be passed to handler() function. */
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    cpu_t *cpu;         /**< On which processor is this timeout registered. */
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    cpu_t *cpu;         /**< On which processor is this timeout registered. */
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};
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} timeout_t;
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extern void timeout_init(void);
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extern void timeout_init(void);
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extern void timeout_initialize(timeout_t *t);
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extern void timeout_initialize(timeout_t *t);
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extern void timeout_reinitialize(timeout_t *t);
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extern void timeout_reinitialize(timeout_t *t);
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extern void timeout_register(timeout_t *t, uint64_t usec, timeout_handler_t f, void *arg);
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extern void timeout_register(timeout_t *t, uint64_t usec, timeout_handler_t f, void *arg);