On 03/18, Peter Zijlstra wrote:
>
> I think we can avoid the entire function if we add
> WQ_FLAG_LIFO and make prepare_to_wait_event() DTRT.
Agreed, this looks very natural.
prepare_to_wait_event(WQ_FLAG_LIFO) should probably skip all "flags == 0"
entries before list_add(). Given that it is supposed that the users won't
mix exclusive and !exclusive, perhaps the additional list_for_each() won't
hurt?
> Then we only need to teach ___wait() about this; and I suppose we could
> make .exclusive=-1 be the LIFO flag.
Or we can change ___wait_event()
- if (exclusive)
\
- __wait.flags = WQ_FLAG_EXCLUSIVE;
\
- else
\
- __wait.flags = 0;
\
+ __wait.flags = exclusive;
\
and obviously change the callers. Perhaps this argument should be renamed
then.
But I am fine either way, just I like the idea to extend the current
interface.
Oleg.
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