code: def omp_flush():
      result1 = 0
      result2 = 0
      if "omp parallel":
          use_omp = omp.in_parallel()
          rank = omp.get_thread_num()
          "omp barrier"
          if rank == 1:
              result2 = 3
              "omp flush (result2)"
              dummy = result2
          if rank == 0:
              sleep(0.5)
              "omp flush(result2)"
              result1 = result2
      return not use_omp or (
          result1 == result2 and result2 == dummy and result2 == 3
      )
  
label_desc: Use image node_id 1 for calling a global function with example usage: omp_flush() and returns: unknown