using System.Threading；
// 提供同步访问对象的机制。
public static class Monitor {
	public static bool Wait(object obj, xxx);
	public static void Enter(object obj, xxx);
	public static bool TryEnter(object obj, xxx);
	public static void Exit(object obj);
	public static void Pulse(object obj);
	public static void PulseAll(object obj);
}　

using System.Threading；
// 限制可同时访问某一资源或资源池的线程数
public sealed class Semaphore : WaitHandle {
	public Semaphore(int initialCount, int maximumCount, xxx);
	public static Semaphore OpenExisting(string name, xxx);
	public int Release();
	public int Release(int releaseCount);
}

using System.Threading；
// 一个同步基元，也可用于进程间同步。
public sealed class Mutex : WaitHandle {
	public Mutex();
	public Mutex(bool initiallyOwned, xxx);
	public static Mutex OpenExisting(string name);
	public void ReleaseMutex();
}