threads

gistfile1.cpp

#include <iostream>
#include <thread>


int main()
{
    for (int i = 0; i < 1000; ++i) {
        int a = 5;
        int b = 5;
        int sum = 0;

        std::thread th1([&]() {
                            a = 3;
                            b = 1;
                        });

        std::thread th2([&]() {
                            if (b == 1) {
                                sum += a;
                                if (sum != 3)
                                    exit(-1);
                            }
                        });

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

    return 0;
}