tools/memory-model/litmus-tests/SB+poonceonces.litmus

   1 C SB+poonceonces
   2
   3 (*
   4  * Result: Sometimes
   5  *
   6  * This litmus test demonstrates that at least some ordering is required
   7  * to order the store-buffering pattern, where each process writes to the
   8  * variable that the preceding process reads.
   9  *)
  10
  11 {}
  12
  13 P0(int *x, int *y)
  14 {
  15         int r0;
  16
  17         WRITE_ONCE(*x, 1);
  18         r0 = READ_ONCE(*y);
  19 }
  20
  21 P1(int *x, int *y)
  22 {
  23         int r0;
  24
  25         WRITE_ONCE(*y, 1);
  26         r0 = READ_ONCE(*x);
  27 }
  28
  29 exists (0:r0=0 /\ 1:r0=0)