[littledanehren]

Good point about C. You misunderstand the intent of my post though.

First, as a small point, I was not seriously suggesting using thread pools to implement mlock_eventfd. That's just a way that we could play around with it short of a kernel implementation, which would probably be more efficient.

Second, I don't think I'm dogmatic about mmap. It's just a cool interface that would be nice to see more widely used, and I was suggesting that it might be more usable with a small addition. Commenters here, at my blog and on Reddit have pointed out other problems, and I'm happy to learn about these. If mmap isn't good and we should keep using DIO, then I think there are still possible improvements that we could make to the interface to allow better cooperation with the kernel.