shared: bool flag[] = { false, false };
        // Do I want to be in the C.S.
        int turn = 0;
        // Whose turn is it not to be polite


  Process 0                |   Process 1
---------------------------+--------------------------
  flag[0] = true;          |   flag[1] = true;
  while (flag[1])          |   while (flag[0])
  { if (turn == 0)         |   { if (turn == 1)
      pause();             |       pause();
    else                   |     else
    { flag[0] = false;     |     { flag[1] = false;
      pause();             |       pause();
      flag[0] = true; } }  |       flag[1] = true; } }
  C.S.                     |   C.S.
  turn = 1;                |   turn = 0;
  flag[0] = false;         |   flag[1] = false;
                           |

(Dekker's algorithm)