[LAD] [LAU] Simple, easy multithreaded circular buffer library for Linux?

Sean Bolton musound at jps.net
Wed Oct 22 18:45:31 UTC 2008

On Oct 20, 2008, at 3:18 PM, Olivier Guilyardi wrote:
> What about the test-int-array-* family of tests on PPC?

They all pass on my uniprocessor G4, but that doesn't
really tell us much.  Anybody got a multiprocessor PPC?

This stuff makes my head hurt, too, but as best I can
figure out, I believe the jack code needs memory
barriers on several non-x86 architectures with weak
memory ordering, PPC probably being the most
common.  It appears to me that without barriers,
there's a small chance reordered writes on one
processor could result in another processor reading
invalid data:

CPU1:         CPU2:
write index   ---
write data2   read index
write data3   read data1 <- invalid
write data1   read data2
---           read data3

Paul E. McKenney

Memory Ordering in Modern Microprocessors, Part I

Memory Ordering in Modern Microprocessors, Part II

Linus Torvalds
Re: Memory barriers and spin_unlock safety

Parts of this *thread*
Re: Re: [liblf-dev] Possible lock-free ring buffer: msg#00152


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