Messages in this thread | | | Date | Tue, 5 Nov 2019 10:59:24 +0100 (CET) | From | Thomas Gleixner <> | Subject | Re: [RFC v2 PATCH] futex: extend set_robust_list to allow 2 locking ABIs at the same time. |
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On Tue, 5 Nov 2019, Florian Weimer wrote: > * Shawn Landden: > > If this new ABI is used, then bit 1 of the *next pointer of the > > user-space robust_list indicates that the futex_offset2 value should > > be used in place of the existing futex_offset. > > The futex interface currently has some races which can only be fixed by > API changes. I'm concerned that we sacrifice the last bit for some > rather obscure feature. What if we need that bit for fixing the > correctness issues?
That current approach is going nowhere and if we change the ABI ever then this needs to happen with all *libc folks involved and agreeing.
Out of curiosity, what's the race issue vs. robust list which you are trying to solve?
Thanks,
tglx
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