Messages in this thread | | | Date | Fri, 5 Sep 2003 18:55:52 +0100 | From | Jamie Lokier <> | Subject | Re: [PATCH] Alternate futex non-page-pinning and COW fix |
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Rusty Russell wrote: > In message <20030904171609.GA30394@mail.jlokier.co.uk> 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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