[linux-audio-dev] lock-free ring buffer code

Steve Harris S.W.Harris at ecs.soton.ac.uk
Sat Apr 5 12:19:00 UTC 2003

On Sat, Apr 05, 2003 at 06:15:09 +0200, Ingo Oeser wrote:
> Now make that thread-safe and esp. thread-safe on an architecture
> with weak memory ordering and all the fun stuff.

Sure, it will only work on architectures where 32bit reads and writes are
> If you have that all working and look at the assembly, then my
> solution is actually smaller, since all your pointer updates are
> required to be atomic anyway and that's what we tryed to optimize
> away here.

Smalled is not the issue, its branches that are important in inner loops.
> Yes, your solution is a perfect DSP-chip or hardware solution. It
> is even nice for ix86, if you have a not that optimizing
> compiler.

I dont think compiler will optimise away the trhread safeness, unless I've
missed something. A vectorising compiler might unroll the loops but it
will still keep the ordering, and the aligned vector operations are still
atomic AFAIK.

- Steve 

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