52 std::atomic_int test2(0);  variable
71   assert(test2 == 0);  in f2()
73   while (test2 == 0)  in f2()
76   assert(test2 == 1);  in f2()
77   test2 = 2;  in f2()
92     test2 = 1;  in main()
101       assert(test2 == 1);  in main()
106       assert(test2 == 2);  in main()
108       test2 = 0;  in main()
118       assert(test2 == 0);  in main()
123       assert(test2 == 2);  in main()
125       test2 = 0;  in main()