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

Fortran:

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

Reference:

OpenACC specification v2.6, section 3.2.24.