Interlocked 使用

using System;

using System.Threading;



namespace InterlockedExchange_Example

{

    class MyInterlockedExchangeExampleClass

    {

        //0 for false, 1 for true.

        private static int usingResource = 0;



        private const int numThreadIterations = 5;

        private const int numThreads = 10;



        static void Main()

        {

            Thread myThread;

            Random rnd = new Random();



            for (int i = 0; i < numThreads; i++)

            {

                myThread = new Thread(new ThreadStart(MyThreadProc));

                myThread.Name = String.Format("Thread{0}", i + 1);



                //Wait a random amount of time before starting next thread.

                Thread.Sleep(rnd.Next(0, 1000));

                myThread.Start();

            }



            Console.WriteLine("done.");

            Console.ReadKey();

        }



        private static void MyThreadProc()

        {

            for (int i = 0; i < numThreadIterations; i++)

            {

                UseResource();



                //Wait 1 second before next attempt.

                Thread.Sleep(1000);

            }

        }



        //A simple method that denies reentrancy.

        static bool UseResource()

        {

            //0 indicates that the method is not in use.

            if (0 == Interlocked.Exchange(ref usingResource, 1))

            {

                Console.WriteLine("{0} acquired the lock", Thread.CurrentThread.Name);



                //Code to access a resource that is not thread safe would go here.



                //Simulate some work

                Thread.Sleep(500);



                Console.WriteLine("{0} exiting lock", Thread.CurrentThread.Name);



                //Release the lock

                Interlocked.Exchange(ref usingResource, 0);

                return true;

            }

            else

            {

                Console.WriteLine("   {0} was denied the lock", Thread.CurrentThread.Name);

                return false;

            }

        }



    }

}

　　

http://msdn.microsoft.com/zh-cn/library/system.threading.interlocked.aspx