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    SubjectRe: [PATCH] Alternate futex non-page-pinning and COW fix
    Rusty Russell wrote:
    > In message <> you write:
    > > What does PROT_SEM mean for Linux, btw?
    > It's a relic: some archs might need a special flag to ensure
    > inter-process atomic ops worked as expected. It was never fully
    > implemented, with the assumption that such archs just won't be able to
    > use futexes, and if someone really wants to fix it, they will.

    Looking at the kernel I can confidently say it was never implemented
    at all. sys_mprotect mentioned PROT_SEM but it was a misleading logic
    error that did nothing useful :)

    -- Jamie

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