Messages in this thread | | | Date | Fri, 17 Feb 2006 08:23:26 -0800 | From | Darren Hart <> | Subject | Re: Robust futexes |
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Rusty Russell wrote: > Hi Ingo, all, > > Noticed (via LWN, hence the delay) your robust futex work. Have you > considered the less-perfect, but simpler option of simply having futex > calls which tell the kernel that the u32 value is in fact the holder's > TID? > > In this case, you don't get perfect robustness when TID wrap occurs: > the kernel won't know that the lock holder is dead. However, it's > simple, and telling the kernel that the lock is the tid allows the > kernel to do prio inheritence etc. in future.
Priority Inheritance has come up a couple of times in relation to Ingo's new LightWeight Robust Futexes. Ingo has said that PI is orthogonal to LWRF, but I don't think we've heard if there are plans already in the works (or in his head :-) for PI. Rusty's comment above reads as "the current LWRF implementation cannot support PI" - is there something about it that makes PI impractical to implement?
Thanks,
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