Re: Change in functionality of futex() system call.

[George Spelvin]

I'm not sure if it's best, but the risk of RO waiters interfering could
be solved by giving them a lower prioirty for wakeup and always waking
RW-mapped waiters first.

In most cases, there would only be one type of waiter, so this would
have no effect, but if there were, a RO-mapped reader couldn't "steal"
wakeup from someone who had it RW-mapped.

It might conflict with a fairness goal, but it does solve the problem
without any extension to the API.
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