在上图我们可以看见有这样一个传址参数

long duetime = -10 * us;

原参数类型为 LARGE_INTEGER

定义是用long而不是double

表示需要延迟的时间 它是以100纳秒为一单位

你给1表示100纳秒 是该函数可接最低时钟周期

CreateWaitableTimer // 创建可等待计时器

SetWaitableTimer // 启动可等待计时器

MsgWaitForMultipleObjects // 等待内核对象或消息

CloseHandle // 关闭内核对象

示例代码：

public static void Main() { UsDelay(5); // 5us } public static void UsDelay(int us) { long duetime = -10 * us; int hWaitTimer = CreateWaitableTimer(NULL, true, NULL); SetWaitableTimer(hWaitTimer, ref duetime, 0, NULL, NULL, false); while (MsgWaitForMultipleObjects(1, ref hWaitTimer, false, Timeout.Infinite, QS_TIMER)); CloseHandle(hWaitTimer); }        [DllImport("kernel32.dll")]         public static extern int CreateWaitableTimer(int lpTimerAttributes, bool bManualReset, int lpTimerName);         [DllImport("kernel32.dll")]         public static extern bool SetWaitableTimer(int hTimer, ref long pDueTime,              int lPeriod, int pfnCompletionRoutine, // TimerCompleteDelegate             int lpArgToCompletionRoutine, bool fResume);         [DllImport("user32.dll")]         public static extern bool MsgWaitForMultipleObjects(uint nCount, ref int pHandles,             bool bWaitAll, int dwMilliseconds, uint dwWakeMask);         [DllImport("kernel32.dll")]         public static extern bool CloseHandle(int hObject);         public const int NULL = 0;         public const int QS_TIMER = 0x10;