Canonical ring-buffer code : SMP, single-reader/writer

[Tom Brown]

Does anyone happen to know of any good example code that I could use in 
a driver for a simple single-reader, single-writer, ring buffer, on an 
SMP system?

My own code doesn't use any locks, but I'm concerned that it may be 
flaky. It's running on an 8-core processor, and I'm worried that I may 
be seeing SMP locking issues which I don't understand because the driver 
is on one core, while the user is on another core.

In my case, the producer is the driver, and the consumer is the user. I 
could just lock all the driver writes to the buffer and the driver's 
update of the shared 'last written' pointer, but that seems a really 
poor design.

Thanks -

Tom
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