linuxaudio.org

On Wed, 2008-10-15 at 13:02 +0200, Olivier Guilyardi wrote:

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> Pa

>

> I'm no memory barrier expert, but from what I read this looks like a complex

> topic. Adding them to jack's ring buffer may be hazardous without carefully

> crafted test cases. Bugs related to missing barriers may or may not happen

> according to various hardware-related issues.

the point of memory barriers is really to remove the need for test

cases :)
> Here's what Ross Bencina says about it: "the correct implementation of these

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> algorithms also requires an understanding of the use of memory barriers to force

> the order of some memory reads and writes on SMP systems. This is because memory

> controllers may reorder reads and writes as observed by other processors on an

> SMP system (or by prehipherals on a uniprocessor system)."

what is complex about memory barriers is understanding *why* they are

necessary. their use is really quite straightforward.
> As a user of these projects I sense that people from Portaudio, PulseAudio and

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> Jack could collaborate on this topic. And Ross Bencina's initiative may be the

> right place for this:

> http://www.audiomulch.com/~rossb/code/lockfree/liblfds/index.htm

if you read that page carefully you will see that ross was still waiting

to set up a repository when that page was last updated (2006). a shame.

though i can speak, did i do anything to help it out?
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