On 2015-07-01 11:19:40 +0100, Simon Riggs wrote:
> What "tricks" are being used??
>
> Please explain why taking 2 locks is bad here, yet works fine elsewhere.
I didn't say anything about 'bad'. It's more complicated than one
lock. Suddenly you have to care about lock ordering and such. The
algorithms for ensuring correctness gets more complicated.