On Wed, 2008-10-01 at 16:57 +0100, Gregory Stark wrote:
> I wonder if we could do something clever here though. Only one process
> is busy
> calculating the checksum -- it just has to know if anyone fiddles the hint
> bits while it's busy.
What if the hint bits are added at the very end to the checksum, with an
exclusive lock to them ? Then the exclusive lock should be short
enough... only it might be deadlock-prone as any lock upgrade...
Cheers,
Csaba.