acc_update_device– Update device memory from mapped host memory.
This function updates the device copy from the previously mapped host memory. The host memory is specified with the host address a and a length of len bytes.
In Fortran, two (2) forms are supported. In the first form, a specifies a contiguous array section. The second form a specifies a variable or array element and len specifies the length in bytes.
OpenACC specification v2.0, section 3.2.23.