code: def omp_single():
      nr_threads_in_single = 0
      result = 0
      nr_iterations = 0
      LOOPCOUNT = 1000
  
      if "omp parallel":
          for i in range(LOOPCOUNT):
              if "omp single":
                  "omp flush"
                  nr_threads_in_single += 1
                  "omp flush"
                  nr_iterations += 1
                  nr_threads_in_single -= 1
                  result += nr_threads_in_single
      return result == 0 and nr_iterations == LOOPCOUNT
  
label_desc: Use image node_id 1 for calling a global function with example usage: omp_single() and returns: unknown