PROT_SEM + FUTEX

Is PROT_SEM necessary anymore? 2.5.46 does not seem to include any references to it that adjust behaviour for pages. Would it be reasonable to remove it, or #define PROT_SEM to (0) to avoid confusion?

I am beginning to play with the FUTEX system call. I am hoping that PROT_SEM is not required, as I intend to scatter the words throughout memory, and it would be a real pain to mprotect(PROT_SEM) each page that contains a FUTEX word.

For systems that do not support the FUTEX system call (2.4.x?), is sched_yield() the best alternative?

Thanks,
mark

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