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/** Wait for the condition becoming true.
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/** Wait for the condition becoming true.
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 *
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 *
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 * @param cv Condition variable.
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 * @param cv Condition variable.
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 * @param mtx Mutex.
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 * @param mtx Mutex.
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 * @param usec Timeout value in microseconds.
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 * @param usec Timeout value in microseconds.
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 * @param trywait Blocking versus non-blocking operation mode switch.
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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 meaning of possible values of usec,
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 * usec and trywait, see comment for waitq_sleep_timeout().
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 * 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 _condvar_wait_timeout(condvar_t *cv, mutex_t *mtx, __u32 usec, int trywait)
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int _condvar_wait_timeout(condvar_t *cv, mutex_t *mtx, __u32 usec)
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{
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{
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    int rc;
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    int rc;
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    ipl_t ipl;
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    ipl_t ipl;
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    ipl = waitq_sleep_prepare(&cv->wq);
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    ipl = waitq_sleep_prepare(&cv->wq);
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    mutex_unlock(mtx);
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    mutex_unlock(mtx);
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    cv->wq.missed_wakeups = 0;  /* Enforce blocking. */
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    rc = waitq_sleep_timeout_unsafe(&cv->wq, usec, trywait);
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    rc = waitq_sleep_timeout_unsafe(&cv->wq, usec, SYNCH_BLOCKING);
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    mutex_lock(mtx);
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    mutex_lock(mtx);
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    waitq_sleep_finish(&cv->wq, rc, ipl);
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    waitq_sleep_finish(&cv->wq, rc, ipl);
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    return rc;
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    return rc;