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 *
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 *
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 * @param wq Pointer to wait queue.
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 * @param wq Pointer to wait queue.
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 * @param usec Timeout in microseconds.
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 * @param usec Timeout in microseconds.
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 * @param nonblocking Blocking vs. non-blocking operation mode switch.
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 * @param nonblocking Blocking vs. non-blocking operation mode switch.
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 *
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 *
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 * If usec is greater than zero, regardless of the value of nonblocking,
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 * If @usec is greater than zero, regardless of the value of @nonblocking,
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 * the call will not return until either timeout or wakeup comes.
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 * the call will not return until either timeout or wakeup comes.
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 *
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 *
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 * If usec is zero and nonblocking is zero (false), the call
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 * If @usec is zero and @nonblocking is zero (false), the call
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 * will not return until wakeup comes.
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 * will not return until wakeup comes.
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 *
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 *
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 * If usec is zero and nonblocking is non-zero (true), the call will
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 * If @usec is zero and @nonblocking is non-zero (true), the call will
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 * immediately return, reporting either success or failure.
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 * immediately return, reporting either success or failure.
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 *
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 *
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 * @return Returns one of: ESYNCH_WOULD_BLOCK, ESYNCH_TIMEOUT,
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 * @return Returns one of: ESYNCH_WOULD_BLOCK, ESYNCH_TIMEOUT,
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 *         ESYNCH_OK_ATOMIC, ESYNCH_OK_BLOCKED.
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 *         ESYNCH_OK_ATOMIC, ESYNCH_OK_BLOCKED.
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 *
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 *