Use spin-locks when possible. #713
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In Cubic, we have quite a number of locks. Number of them are actually non-recursive
std::mutexand are protecting very small and short-lived regions.Replaced them by spin-locks. A notable exception is
ThreadBlockingQueuewhere we want blocking with sleep semantics and we can't use a spin-loop.Shamelessly copied from (my) work done on pothosware/SoapyPlutoSDR#14 for the PlutoSDR plugin.