Implementation
----------------

The simplest implementation alternative is to have a dispatcher with
a central ``!$omp target`` section, corresponding to the ``!$omp parallel``
section in CPU dispatchers::

  ...
  !$omp target
  !$omp teams num_teams(80) thread_limit(64)
  !$omp parallel
  do while (.not.done)
    call task_list%update
  end do
  !$omp end parallel
  !$omp end target

Inside the solvers only a few extra OpneMP directives are needed, with
the main one being that declarations of arrays need to be complemented
by ``!$omp declare target`` directives, specifying where arrays belong,
and that transfer to and from the GPU at the start and end of the task
update need to be specified by ``!$omp task update`` directives.

.. toctree::
   :maxdepth: 4