概念:

http://baike.baidu.com/view/1250961.htm?fr=ala0_1_1

http://blog.csdn.net/wzhwho/archive/2009/05/15/4190090.aspx

参考:
http://msdn.microsoft.com/zh-cn/library/dd460716.aspx
http://www.cnblogs.com/lengleng3898/archive/2010/04/20/dotnet_4_parallel_plinq_2.html

http://www.cnblogs.com/prime/articles/1632670.html :) 很不错

msdn代码示例
比较了两种锁的效率
先用Monitor再决定是否用SpinLock

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading;
using System.Threading.Tasks;class SpinLockDemo2
{const int N = 100000;static Queue<Data> _queue = new Queue<Data>();static object _lock = new Object();static SpinLock _spinlock = new SpinLock();class Data{public string Name { get; set; }public double Number { get; set; }}static void Main(string[] args){// First use a standard lock for comparison purposes.UseLock();_queue.Clear();UseSpinLock();Console.WriteLine("Press a key");Console.ReadKey();}private static void UpdateWithSpinLock(Data d, int i){bool lockTaken = false;try{_spinlock.Enter(ref lockTaken);_queue.Enqueue(d);}finally{if (lockTaken) _spinlock.Exit(false);}}private static void UseSpinLock(){Stopwatch sw = Stopwatch.StartNew();Parallel.Invoke(() =>{for (int i = 0; i < N; i++){UpdateWithSpinLock(new Data() { Name = i.ToString(), Number = i }, i);}},() =>{for (int i = 0; i < N; i++){UpdateWithSpinLock(new Data() { Name = i.ToString(), Number = i }, i);}});sw.Stop();Console.WriteLine("elapsed ms with spinlock: {0}", sw.ElapsedMilliseconds);}static void UpdateWithLock(Data d, int i){lock (_lock){_queue.Enqueue(d);}}private static void UseLock(){Stopwatch sw = Stopwatch.StartNew();Parallel.Invoke(() =>{for (int i = 0; i < N; i++){UpdateWithLock(new Data() { Name = i.ToString(), Number = i }, i);}},() =>{for (int i = 0; i < N; i++){UpdateWithLock(new Data() { Name = i.ToString(), Number = i }, i);}});sw.Stop();Console.WriteLine("elapsed ms with lock: {0}", sw.ElapsedMilliseconds);}
}

输出
在短时间占用资源的情况下,差别很大