1C 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
13P0(int *x, int *y)
14{
15	int r0;
16
17	WRITE_ONCE(*x, 1);
18	r0 = READ_ONCE(*y);
19}
20
21P1(int *x, int *y)
22{
23	int r0;
24
25	WRITE_ONCE(*y, 1);
26	r0 = READ_ONCE(*x);
27}
28
29exists (0:r0=0 /\ 1:r0=0)