Various lock-based and lock-free algorithms tested for multiple readers and writers scenarios.

The purpose is to show the performance of different approaches.

Run with maven:

One reader, One writer:
> mvn -P 1r1w

Two readers, One writer:
> mvn -P 2r1w

Three readers, One writer:
> mvn -P 3r1w

Two readers, Two writers
> mvn -P 2r2w