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3.7.10 omp_target_disassociate_ptr – Remove device–host pointer association ¶

Description:

This routine removes the storage association established by calling omp_target_associate_ptr and sets the reference count to zero, even if omp_target_associate_ptr was invoked multiple times for for host pointer ptr. If applicable, the device memory needs to be freed by the user.

If an associated device storage location for the device_num was found and has infinite reference count, the association is removed and zero is returned. In all other cases, nonzero (EINVAL) is returned and no other action is taken.

Note that passing a host pointer where the association to the device pointer was established with the declare target directive yields undefined behavior.

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

C/C++

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

Fortran:

Interface:	integer(c_int) function omp_target_disassociate_ptr(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_target_associate_ptr – Associate a device pointer with a host pointer

Reference:

OpenMP specification v5.1, Section 3.8.10