C C-atomicpo.litmus

{
}

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

P1(int *x, int *y)
{
	r1 = xchg_relaxed(x, 1);
	r2 = xchg_relaxed(y, 1);
}

exists (1:r1=1 /\ 1:r2=0)