C++如何使用原子操作(atomic)_C++ 原子操作方法

#include <atomic>
#include <iostream>

std::atomic<int> counter(0);  // 初始化为 0
std::atomic<bool> ready(false);

counter = 10;
ready.store(true);  // 显式写入

#include <atomic>
#include <thread>
#include <vector>

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

void increment() {
    for (int i = 0; i < 1000; ++i) {
        count.fetch_add(1);  // 原子增加
        // 或者直接使用 ++count;
    }
}

int main() {
    std::vector<std::thread> threads;
    for (int i = 0; i < 10; ++i) {
        threads.emplace_back(increment);
    }

    for (auto& t : threads) {
        t.join();
    }

    std::cout << "Final count: " << count.load() << "\n";
    return 0;
}

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

int expected = 0;
if (val.compare_exchange_weak(expected, 100)) {
    std::cout << "Change successful: " << val.load() << "\n";
} else {
    std::cout << "Change failed, current value is " << expected << "\n";
}

int expected = val.load();
do {
    // 修改 expected 的值
} while (!val.compare_exchange_weak(expected, new_value));

counter.fetch_add(1, std::memory_order_relaxed);
ready.store(true, std::memory_order_release);
bool status = ready.load(std::memory_order_acquire);