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 * @param s Semaphore.
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 * @param s Semaphore.
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 * @param usec Timeout in microseconds.
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 * @param usec Timeout in microseconds.
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 * @param trydown Switches between blocking and non-blocking mode.
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 * @param trydown Switches between blocking and non-blocking mode.
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 *
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 *
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 * For exact description of possible combinations of
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 * For exact description of possible combinations of
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 * @usec and @trydown, see comment for waitq_sleep_timeout().
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 * usec and trydown, see comment for waitq_sleep_timeout().
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 *
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 *
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 * @return See comment for waitq_sleep_timeout().
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 * @return See comment for waitq_sleep_timeout().
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 */
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 */
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int _semaphore_down_timeout(semaphore_t *s, __u32 usec, int trydown)
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int _semaphore_down_timeout(semaphore_t *s, __u32 usec, int trydown)
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{
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{