Macro rumtk_async_sleep 

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

Sleep for some duration of time in an async context. Meaning, we can be awaited.

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_async_sleep, rumtk_exec_task};
    use rumtk_core::core::RUMResult;
    rumtk_exec_task!( async || -> RUMResult<()> {
            rumtk_async_sleep!(1).await;           // Sleeps for 1 second.
            rumtk_async_sleep!(0.001).await;       // Sleeps for 1 millisecond
            rumtk_async_sleep!(0.000001).await;    // Sleeps for 1 microsecond
            rumtk_async_sleep!(0.000000001).await; // Sleeps for 1 nanosecond
            Ok(())
        }
    );