Re: questions about native alpha futex implementation

[Richard Henderson]

Matt Turner wrote:
> Hi,
>
> Alpha uses a generic futex implementation, which causes some problems [1].
>
> I've read through the code, and it appears as if the implementation
> could be done by using the ldq_l/stq_c instructions, relatively easy I
> might add. I'm definitely interested in implementing this, but first...
>
> I have only a few questions.
>
> 1) What are the benefits of a native futex implementation, other than
> fixing the glibc test failures?
> 2) Is there a technical reason it hasn't been implemented on Alpha?
> 3) Am in correct that it could be done with ldq_l/stq_c instructions?

I think all the futex stuff is 32-bits wide, so ldl_l/stl_c.
You can pretty much just copy the powerpc version, as that
platform also uses load-locked/store-conditional operations.


r~
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