code: def omp_nested():
      import omp
  
      counter = 0
      omp.set_nested(1)
  
      if "omp parallel shared(counter) num_threads(4)":
          use_omp = omp.in_parallel()
          if "omp critical":
              counter += 1
  
          if "omp parallel num_threads(4)":
              if "omp critical":
                  counter -= 1
      return counter != 0 or not use_omp
  
label_desc: Use image node_id 1 for calling a global function with example usage: omp_nested() and returns: unknown