Function copy_htod 

pub fn copy_htod<T: Copy>(
    dst: &mut DeviceBuffer<T>,
    src: &[T],
) -> CudaResult<()>

Copies data from a host slice into a device buffer (host-to-device).

This is a synchronous operation: it blocks the calling thread until the transfer completes.

Errors

• CudaError::InvalidValue if src.len() != dst.len().
• Other driver errors from cuMemcpyHtoD_v2.