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C WRC+poonceonces+Once

(*
 * Result: Sometimes
 *
 * This litmus test is an extension of the message-passing pattern,
 * where the first write is moved to a separate process.  Note that this
 * test has no ordering at all.
 *)

{
	int x;
	int y;
}

P0(int *x)
{
	WRITE_ONCE(*x, 1);
}

P1(int *x, int *y)
{
	int r0;

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

P2(int *x, int *y)
{
	int r0;
	int r1;

	r0 = READ_ONCE(*y);
	r1 = READ_ONCE(*x);
}

exists (1:r0=1 /\ 2:r0=1 /\ 2:r1=0)