atomic 及内存序

#include "iostream"
#include "atomic"
#include <thread>
#include <vector>


using namespace std;

std::atomic<int> value(0);


void setValue(int x)
{
    value.store(x, std::memory_order_relaxed);
}

void printValue()
{
    int x;
    do{
        x= value.load(std::memory_order_relaxed);
    }while(x == 0);

    cout << " value : " << x << endl;
}

int main()
{
    thread t1(printValue);
    thread t2(setValue, 100);

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