On Sat, 2008-10-18 at 20:44 +0200, Fons Adriaensen wrote:
> It doesn't matter how many times it is read, but it
> does matter if it is ever written with a wrong value.
> And this *did* happen in the old version at the end of
> a read:
>
> rb->read_ptr += n1;
> rb->read_ptr &= rb->size_mask;
> If a context switch occurs after the first statement,
> and read_ptr > size (which can happen), then the writer
> would believe there is more space to write than there
> actually is.
if read_ptr > size then the math should result in the write space being
*under* estimated. if thats not happening then my worst nightmares come
true, which has happened before. is there a signed/unsigned issue going
on here?
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Received on Sun Oct 19 00:15:04 2008
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