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原子操作和atomic关键字
source link: https://charon-cheung.github.io/2022/05/18/C++/%E5%A4%9A%E7%BA%BF%E7%A8%8B/%E5%8E%9F%E5%AD%90%E6%93%8D%E4%BD%9C%E5%92%8Catomic%E5%85%B3%E9%94%AE%E5%AD%97/
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原子操作和atomic关键字 | 沉默杀手
std::atomic
//int v = 0;
std::atomic<int> v(0);
void Test()
{
for(int i=0; i<10000; i++)
++v;
}
int main(int argc, char *argv[])
{
std::thread t1(Test);
std::thread t2(Test);
t1.join();
t2.join();
std::cout << "v: " << v << std::endl;
return 0;
}
如果只用简单的全局变量int v = 0;，结果一般不是20000。 换上std::atomic<int> v(0);，结果必为20000
参考：
Item40 Use std::atomic for concurrency
聊一聊原子操作
C++11多线程编程详解
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