精确获取系统时钟

uint64_t get_timestamp1()
{
    //     struct timeval tm;
    //     gettimeofday(&tm, NULL);
    //     return (uint64_t)(tm.tv_sec*1000+tm.tv_usec/1000);

    LARGE_INTEGER  counter;
    LARGE_INTEGER freq = { 0 };
    QueryPerformanceFrequency(&freq);
    QueryPerformanceCounter(&counter);
    return (counter.QuadPart * 1000) / (freq.QuadPart);
}