Add support for asynchronous disk operations using libaio

[Adam-]

No description provided.

[manjuraj]

@Adam- could you resolve conflicts and resubmit the patch?

[Adam-]

Hi @manjuraj. It looks like this might be non-trival, but would be easier if #21 was merged. Maybe instead you should review the code and see if it is something you want or not. It has been many years since I looked at this and it will take some time to re-familiarize myself with it.

[CLAassistant]

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