linux/tools/memory-model/litmus-tests/CoWW+poonceonce.litmus
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   1C CoWW+poonceonce
   2
   3(*
   4 * Result: Never
   5 *
   6 * Test of write-write coherence, that is, whether or not two successive
   7 * writes to the same variable are ordered.
   8 *)
   9
  10{}
  11
  12P0(int *x)
  13{
  14        WRITE_ONCE(*x, 1);
  15        WRITE_ONCE(*x, 2);
  16}
  17
  18exists (x=1)
  19