atomic/example2.cpp

// atomic::operator=/operator T example:
#include <iostream>       // std::cout
#include <atomic>         // std::atomic
#include <thread>         // std::thread, std::this_thread::yield

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

void set_foo(int x) {
foo = x;
}

void print_foo() {
 while (foo==0) {             // wait while foo=0
   std::this_thread::yield();
 }
 std::cout << "foo: " << foo << '\n';
}

int main ()
{
 std::thread first (print_foo);
 std::thread second (set_foo,10);
 first.join();
 second.join();
 return 0;
}