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3.7.3 omp_target_is_present – Check whether storage is mapped ¶

Description:

This routine tests whether storage, identified by the host pointer ptr is mapped to the device specified by device_num. If so, it returns a nonzero value and otherwise zero. In particular, it always returns zero for the null pointer and for invalid device numbers; for the host device, a nonzero value is returned for all non-null pointers.

Running this routine in a target region except on the initial device is not supported.

C/C++

Prototype:	int omp_target_is_present(const void *ptr,
	int device_num)

Fortran:

Interface:	integer(c_int) function omp_target_is_present(ptr, &
	device_num) bind(C)
	use, intrinsic :: iso_c_binding, only: c_ptr, c_int
	type(c_ptr), value :: ptr
	integer(c_int), value :: device_num

See also:

omp_get_mapped_ptr – Return device pointer to a host pointer, omp_target_associate_ptr – Associate a device pointer with a host pointer, omp_target_is_accessible – Check whether memory is device accessible

Reference:

OpenMP specification v5.1, Section 3.8.3