我可以在不读取值的情况下确定数据竞争的结果吗?

如果你知道 x 在比赛开始之前,下面的代码使用原子的读-修改-写操作应该完成这项工作。

// Notes:
// x == 0
// x and winner are both atomic
// atomic_swap swaps the content of two variables atomically, 
// meaning, that no other thread can interfere with this operation

//thread-1:
t = 1;
atomic_swap(x, t);
if (t != 0) {
    //x was non zero, when thread-1 called the swap operation
    //--> thread-2 was faster
    winner = 1;
}    

//thread-2
t = 2;
atomic_swap(x, t);
if (t != 0) {
    //x was non zero, when thread-2 called the swap operation
    //--> thread-1 was faster
    winner = 2;
}  

//thread-3
while (winner == 0) {} 
print("Winner is " + winner);