The Qt API needs a QTimer with nanosecond accuracy. I know what is actually provided by underlying platforms varies greatly. But instead of Qt introducing its own limitation, Qt needs to provide a way for what the underlying platform can support to be accessed. If a platform does not support nanosecond accuracy, it can simply be rounded to the accuracy that the platform supports. select() on Linux and other OSs supports nanosecond interval, so a nanosecond interval can simply be passed straight through to select on those platforms. I know it is no guarantee that it is actually nanosecond accuracy, and probably not, but just expose the nanosecond interface that the OS supports and let the developer determine their own strategy and needs.
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