C++11 how to test memory order

there. I want to test the code below.

atomic<int> x(0);
atomic<int> y(0);

void thr1()
{
    x.store(1,memory_order_relaxed);
    y.store(1,memory_order_relaxed);
}

void thr2()
{
    while(!y.load(memory_order_relaxed))
        ;
    cout<<x.load(memory_order_relaxed)<<endl;   //may 0 or 1
}

I know the output may be 0.
However, no matter how much times I tried, I always get 1.
Is this because of my CPU is x86 architecture?

If not, how to fix this problem?
(BTW, I know CppMem. But it cannot use loop.)