et the
     lock before, one of them is chosen to, again, set the lock to
     itself.

_C/C++_:
     _Prototype_:   'void omp_unset_lock(omp_lock_t *lock);'

_Fortran_:
     _Interface_:   'subroutine omp_unset_lock(svar)'
                    'integer(omp_lock_kind), intent(inout) :: svar'

_See also_:
     *note omp_set_lock::, *note omp_test_lock::

_Reference_:
     OpenMP specification v4.5 (https://www.openmp.org), Section 3.3.5.