Add option to use futex APIs for spinlock
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During the discussion of [1] it has been suggested that the congestion could be reduced by relying on C++20 futex APIs. Additionally we incorporated the `try_lock()` design from [2]. [1]: efficient#146 [2]: https://rigtorp.se/spinlock/ Co-authored-by: Milian Wolff <milian.wolff@kdab.com>
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During the discussion of #146 it has been suggested that the congestion
could be reduced by relying on C++20 futex APIs. Additionally we
incorporated the
try_lock()design from 2.Please note that this hasn't been benchmarked.