C++实现windows高精度微秒级延时(亲测可用)

C++实现windows高精度微秒级延时(亲测可用)
代码如下：

#include <iostream>
#include <windows.h>

// 定义一个结构体来保存性能计数器的频率和时间戳
struct PerformanceCounter {
    LARGE_INTEGER frequency; // 计数器频率
    LARGE_INTEGER start;      // 开始时间戳
    LARGE_INTEGER end;        // 结束时间戳
};

// 初始化性能计数器
void InitPerformanceCounter(PerformanceCounter& counter) {
    // 获取计数器频率
    QueryPerformanceFrequency(&counter.frequency);
}

// 计算两个时间戳之间的微秒差
double CalculateMicrosecondDifference(const LARGE_INTEGER& start, const LARGE_INTEGER& end, const LARGE_INTEGER& frequency) {
    // 计算差值并转换为微秒
    return static_cast<double>(end.QuadPart - start.QuadPart) / frequency.QuadPart * 1000000.0;
}

// 实现微秒级延时
void MicrosecondDelay(unsigned int microseconds) {
    PerformanceCounter counter;
    InitPerformanceCounter(counter);

    // 获取延时前的计数器值
    QueryPerformanceCounter(&counter.start);

    // 计算延时后的计数器目标值
    unsigned __int64 targetCounter = counter.start.QuadPart + (static_cast<unsigned __int64>(microseconds) * counter.frequency.QuadPart) / 1000000;

    // 循环直到当前计数器值达到或超过目标值
    do {
        QueryPerformanceCounter(&counter.end);
    } while (counter.end.QuadPart < targetCounter);
}

int main() {
    // 测试微秒级延时函数5us/次 循环200万次 共10s
    std::cout << "开始执行 5 微秒的延时..." << std::endl;
    for (int i = 0; i < 2000000; i++)
    {
        MicrosecondDelay(5);
    }
    
    std::cout << "延时结束。" << std::endl;
	system("pause");
    return 0;
}