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### 5.23 `acc_update_device` – Update device memory from mapped host memory.

Description

  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.

C/C++:

  Prototype: | `acc_update_device(h_void *a, size_t len);`

Fortran:

  Interface: | `subroutine acc_update_device(a)`
  | `type, dimension(:[,:]...) :: a`
  Interface: | `subroutine acc_update_device(a, len)`
  | `type, dimension(:[,:]...) :: a`
  | `integer len`

Reference:

  OpenACC specification v2.0, section 3.2.23.