Sleep until a condition gets true or a timeout elapses
wait_event_hrtimeout(wq, condition, timeout);
wq
the waitqueue to wait on
condition
a C expression for the event to wait for
timeout
timeout, as a ktime_t
The process is put to sleep (TASK_UNINTERRUPTIBLE) until the condition evaluates to true or a signal is received. The condition is checked each time the waitqueue wq is woken up.
wake_up has to be called after changing any variable that could change the result of the wait condition.
The function returns 0 if condition became true, or -ETIME if the timeout elapsed.