acc_update_self (GNU libgomp)

### 6.25 `acc_update_self` – Update host memory from mapped device memory. ¶

Description

  This function updates the host copy from the previously mapped device 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_self(h_void *a, size_t len);`
  Prototype: | `acc_update_self_async(h_void *a, size_t len, int async);`

Fortran:

  Interface: | `subroutine acc_update_self(a)`
  | `type(*), dimension(..) :: a`
  Interface: | `subroutine acc_update_self(a, len)`
  | `type(*), dimension(..) :: a`
  | `integer len`
  Interface: | `subroutine acc_update_self_async(a, async)`
  | `type(*), dimension(..) :: a`
  | `integer(acc_handle_kind) :: async`
  Interface: | `subroutine acc_update_self_async(a, len, async)`
  | `type(*), dimension(..) :: a`
  | `integer len`
  | `integer(acc_handle_kind) :: async`

Reference:

  OpenACC specification v2.6, section 3.2.25.