Questions about possible Alpha futex implementation

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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 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'm not experienced with kernel development, but I'd like to learn, so
please bear with me.

Thanks,

Matt Turner

[1] http://bugs.gentoo.org/show_bug.cgi?id=205099
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