//

// 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;

}