acc_is_present – Indicate whether host variable / array is present on device.

Description

This function indicates whether the specified host address in a and a length of len bytes is present on the device. In C/C++, a non-zero value is returned to indicate the presence of the mapped memory on the device. A zero is returned to indicate the memory is not mapped on the device.

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. If the host memory is mapped to device memory, then a true is returned. Otherwise, a false is return to indicate the mapped memory is not present.

C/C++:

Prototype:

int acc_is_present(h_void *a, size_t len);

Fortran:

Interface:	function acc_is_present(a)
	type, dimension(:[,:]...) :: a
	logical acc_is_present
Interface:	function acc_is_present(a, len)
	type, dimension(:[,:]...) :: a
	integer len
	logical acc_is_present

Reference:

OpenACC specification v2.6, section 3.2.30.