linux/tools/memory-model/litmus-tests/CoRW+poonceonce+Once.litmus
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   1C CoRW+poonceonce+Once
   2
   3(*
   4 * Result: Never
   5 *
   6 * Test of read-write coherence, that is, whether or not a read from
   7 * a given variable and a later write to that same variable are ordered.
   8 *)
   9
  10{}
  11
  12P0(int *x)
  13{
  14        int r0;
  15
  16        r0 = READ_ONCE(*x);
  17        WRITE_ONCE(*x, 1);
  18}
  19
  20P1(int *x)
  21{
  22        WRITE_ONCE(*x, 2);
  23}
  24
  25exists (x=2 /\ 0:r0=2)
  26