Macro rumtk_sleep 

macro_rules! rumtk_sleep {
    ( $dur:expr) => { ... };
}

Sleep a duration of time in a sync context, so no await can be call on the result.

You can pass any value that can be cast to f32.

The precision is up to nanoseconds and it is depicted by the number of decimal places.

Examples

    use rumtk_core::rumtk_sleep;
    rumtk_sleep!(1);           // Sleeps for 1 second.
    rumtk_sleep!(0.001);       // Sleeps for 1 millisecond
    rumtk_sleep!(0.000001);    // Sleeps for 1 microsecond
    rumtk_sleep!(0.000000001); // Sleeps for 1 nanosecond