On Sun, 6 Jul 2003, Ian Romanick wrote:
>
> The one catch that I see is that I don't see support for the futex ioctl
> in any 2.4 kernel. I did a 'grep -ri futex include/' in the source for
> 2.4.21-ac2 and for 2.5.69. The 2.4 kernel didn't have any hits, but the
> 2.5 kernel did. Of course, this doesn't mean that support isn't there,
> it just means that it might be more challenging to build a driver on a
> box with only 2.4 kernel sources installed.
I'm pretty sure that the futex code is backported at least into the redhat
tree, since the new threading code really really wants it. But yes, it may
not be in any "official" 2.4.x kernels, and I suspect it's only in the
most recent RH trees too.
And for all I know, I may be wrong even about the RH tree.
Ian - have you tried a quick "just see how the mutex thing works" thing
(ie force mutex use on a new kernel, screw compatibility)? Maybe it is
worth first verifying that it actually _does_ help the fairness issue.
Linus
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