public static class Monitor
{public static extern void Enter(Object obj);public static void Enter(Object obj, ref bool lockTaken){if (lockTaken)ThrowLockTakenException();ReliableEnter(obj, ref lockTaken);Contract.Assert(lockTaken);}private static extern void ReliableEnter(Object obj, ref bool lockTaken);public static void TryEnter(Object obj, ref bool lockTaken){if (lockTaken)ThrowLockTakenException();ReliableEnterTimeout(obj, 0, ref lockTaken);}private static extern void ReliableEnterTimeout(Object obj, int timeout, ref bool lockTaken);public static extern void Exit(Object obj);public static bool Wait(Object obj, int millisecondsTimeout, bool exitContext){if (obj == null)throw (new ArgumentNullException("obj"));return ObjWait(exitContext, millisecondsTimeout, obj);}private static extern bool ObjWait(bool exitContext, int millisecondsTimeout, Object obj);public static void Pulse(Object obj){if (obj == null){throw new ArgumentNullException("obj");}Contract.EndContractBlock();ObjPulse(obj);}private static extern void ObjPulse(Object obj);public static void PulseAll(Object obj){if (obj == null){throw new ArgumentNullException("obj");}Contract.EndContractBlock();ObjPulseAll(obj);}private static extern void ObjPulseAll(Object obj);public static bool IsEntered(object obj){if (obj == null)throw new ArgumentNullException("obj");return IsEnteredNative(obj);}private static extern bool IsEnteredNative(Object obj);
}

    class Program{static void Main(string[] args){new Thread(A).Start();new Thread(B).Start();new Thread(C).Start();Console.ReadLine();}static object lockObj = new object();static void A(){lock (lockObj) //进入就绪队列
            {Thread.Sleep(1000);Monitor.Pulse(lockObj);Monitor.Wait(lockObj); //自我流放到等待队列
            }Console.WriteLine("A exit...");}static void B(){Thread.Sleep(500);lock (lockObj) //进入就绪队列
            {Monitor.Pulse(lockObj);}Console.WriteLine("B exit...");}static void C(){Thread.Sleep(800);lock (lockObj) //进入就绪队列
            { }Console.WriteLine("C exit...");}}

class MyManualEvent{private object lockObj = new object();private bool hasSet = false;public void Set(){lock (lockObj){hasSet = true;Monitor.PulseAll(lockObj);}}public void WaitOne(){lock (lockObj){while (!hasSet){Monitor.Wait(lockObj);}}}}class Program2{static MyManualEvent myManualEvent = new MyManualEvent();static void Main(string[] args){ThreadPool.QueueUserWorkItem(WorkerThread, "A");ThreadPool.QueueUserWorkItem(WorkerThread, "B");Console.WriteLine("Press enter to signal the green light");Console.ReadLine();myManualEvent.Set();ThreadPool.QueueUserWorkItem(WorkerThread, "C");Console.ReadLine();}static void WorkerThread(object state){myManualEvent.WaitOne();Console.WriteLine("Thread {0} got the green light...", state);}}