C语言风格，Linux/Windows 平台获取当前 ticks（毫秒/微秒）

Windows 使用PDH（性能计数器）实现

Linux 使用 gettimeofday 函数实现

两者均支持微妙时间的获取，精度相对较高。

    uint64_t GetTickCount(bool microseconds) noexcept {
#ifdef _WIN32static LARGE_INTEGER ticksPerSecond; // (unsigned long long)GetTickCount64();LARGE_INTEGER ticks;if (!ticksPerSecond.QuadPart) {QueryPerformanceFrequency(&ticksPerSecond);}QueryPerformanceCounter(&ticks);if (microseconds) {double cpufreq = (double)(ticksPerSecond.QuadPart / 1000000);unsigned long long nowtick = (unsigned long long)(ticks.QuadPart / cpufreq);return nowtick;}else {unsigned long long seconds = ticks.QuadPart / ticksPerSecond.QuadPart;unsigned long long milliseconds = 1000 * (ticks.QuadPart - (ticksPerSecond.QuadPart * seconds)) / ticksPerSecond.QuadPart;unsigned long long nowtick = seconds * 1000 + milliseconds;return (unsigned long long)nowtick;}
#elsestruct timeval tv;gettimeofday(&tv, NULL);if (microseconds) {unsigned long long nowtick = (unsigned long long)tv.tv_sec * 1000000;nowtick += tv.tv_usec;return nowtick;}return ((unsigned long long)tv.tv_usec / 1000) + ((unsigned long long)tv.tv_sec * 1000);
#endif}