Am Mittwoch, 15. September 2004 19:34 schrieb Nishanth Aravamudan:
> Oliver,
>
> It was recommended to me to ask you a question about the proper ordering
> of add_wait_queue() and set_current_state().
>
> In some drivers the order is
>
> set_current_state(TASK_INTERRUPTIBLE);
> add_wait_queue(...);
That is correct.
> and in others it is
>
> add_wait_queue(...);
Here in between is a window in which a wake up would be missed.
> set_current_state(TASK_INTERRUPTIBLE);
>
> It seems like one of these should be oorrect and not the other, but I'm
> not sure which is which. Any insight you could provide would be greatly
> appreciated.
Iff you test whether you should indeed sleep before you call schedule,
it doesn't matter. In the other case, you need to use the first form.
HTH
Oliver
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