Windows下的临界写法

#include <windows.h>

class CriticalSection {
public:
    CriticalSection() {
        InitializeCriticalSection(&cs_);
    }

    ~CriticalSection() {
        DeleteCriticalSection(&cs_);
    }

    // 辅助 Guard 类实现自动加锁/解锁
    class Guard {
    public:
        explicit Guard(CriticalSection& cs) : cs_(cs) {
            EnterCriticalSection(&cs_.cs_);
        }

        ~Guard() {
            LeaveCriticalSection(&cs_.cs_);
        }

        // 禁用拷贝与移动
        Guard(const Guard&) = delete;
        Guard& operator=(const Guard&) = delete;

    private:
        CriticalSection& cs_;
    };

private:
    CRITICAL_SECTION cs_;

    // 禁用拷贝与移动
    CriticalSection(const CriticalSection&) = delete;
    CriticalSection& operator=(const CriticalSection&) = delete;
};
怎么用呢？

// 全局共享资源与临界区
CriticalSection g_cs;
int g_sharedData = 0;

void ThreadFunction() {
    for (int i = 0; i < 1000; ++i) {
        CriticalSection::Guard lock(g_cs); // 自动加锁
        ++g_sharedData;                   // 临界区操作
    }                                     // 自动解锁
}

int main() {
    HANDLE threads[2];
    threads[0] = CreateThread(nullptr, 0, (LPTHREAD_START_ROUTINE)ThreadFunction, nullptr, 0, nullptr);
    threads[1] = CreateThread(nullptr, 0, (LPTHREAD_START_ROUTINE)ThreadFunction, nullptr, 0, nullptr);

    WaitForMultipleObjects(2, threads, TRUE, INFINITE);
    CloseHandle(threads[0]);
    CloseHandle(threads[1]);

    std::cout << "Final value: " << g_sharedData << std::endl; // 正确输出 2000
    return 0;
}