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9.13 Implementing SECTIONS construct

A block as 

  #pragma omp sections
  {
    #pragma omp section
    stmt1;
    #pragma omp section
    stmt2;
    #pragma omp section
    stmt3;
  }

becomes 

  for (i = GOMP_sections_start (3); i != 0; i = GOMP_sections_next ())
    switch (i)
      {
      case 1:
        stmt1;
        break;
      case 2:
        stmt2;
        break;
      case 3:
        stmt3;
        break;
      }
  GOMP_barrier ();