C CoRW+poonceonce+Once

(*
 * Result: Never
 *
 * Test of read-write coherence, that is, whether or not a read from
 * a given variable and a later write to that same variable are ordered.
 *)

{
	int x;
}

P0(int *x)
{
	int r0;

	r0 = READ_ONCE(*x);
	WRITE_ONCE(*x, 1);
}

P1(int *x)
{
	WRITE_ONCE(*x, 2);
}

exists (x=2 /\ 0:r0=2)