reordering.cpp

#include <thread>
#include <atomic>
#include <iostream>

int x, y;
int r1, r2;

int main() {
	auto th1 = std::thread{[] {
		y = 1;
		r1 = x;
	}};

	auto th2 = std::thread{[] {
		x = 1;
		r2 = y;
	}};

	th1.join();
	th2.join();

	std::cout << r1 << ' ' << r2 << '\n';
}