帮我看一个程序，我写的一个微秒级延时子程序，需要多线程吗？

void DelayUs(__int64 Us)
{
LARGE_INTEGER CurrTicks, TicksCount;

QueryPerformanceFrequency(&TicksCount);
QueryPerformanceCounter(&CurrTicks);

TicksCount.QuadPart = TicksCount.QuadPart * Us / 1000000;
TicksCount.QuadPart += CurrTicks.QuadPart;

while (CurrTicks.QuadPart < TicksCount.QuadPart)
QueryPerformanceCounter(&CurrTicks);
}

DelayUs( 7200);