//
// 7.6.bad.example.cpp
// chapter 7 parallelism and concurrency
// modern c++ tutorial
//
// created by changkun at changkun.de
// https://github.com/changkun/modern-cpp-tutorial
//

#include <thread>
#include <iostream>

int main() {
 int a = 0;
 volatile int flag = 0;

 std::thread t1([&]() {
 while (flag != 1);

 int b = a;
 std::cout << "b = " << b << std::endl;
 });

 std::thread t2([&]() {
 a = 5;
 flag = 1;
 });

 t1.join();
 t2.join();
 return 0;
}