Re: futex: priority wakeup miss ordering

[Daniel Walker]

On Thu, 2008-05-08 at 12:06 +0200, Thomas Gleixner wrote:

> IIRC this has been discussed before. The priority ordering of the
> plain mutex waiters is an optimization without guarantees of
> correctness across a priority change. It's simply not worth the
> additional complexity and overhead for that corner case.

I've gotten a number of complains about this .. I think it's assumed
that this feature was implementing posix priority queuing for the
standard futex, but it can't be if there are any miss ordered wakeups.

Daniel

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