On Thu, 29 May 2003, Ian Romanick wrote:
>
> You're right. We do _really_ want to use futex'es. However, I don't
> think they're available on *BSD or Solaris.
No. But you don't want to use them directly anyway, they're at the wrong
level. I haven't checked what glibc does, but I bet it has a nice wrapper
around them that makes them look basically like user-level spinlocks.
And once you have a nice wrapper and they look like spinlocks, *BSD and
Solaris must have _some_ equivalent. If worst comes to worst, you do a
"loop with atomic accesses and yield()" thing as a fallback.
> We also have the problem of having to support old kernels with new
> user-mode drivers.
You may also have interesting binary compatibility issues with old and new
DRI binaries running concurrently.
However, I don't think the old kernels are that much of an issue, I think
futexes got back-ported a fair time ago, and I'd assume that most people
who want to have a really recent DRI setup have a fairly recent
distribution too..
But yeah, I don't know which distributions picked up the backports. I
don't follow 2.4.x..
Linus
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