c#读写锁浅记录

public class C
  {
    static private ReaderWriterLockSlim rwl = new ReaderWriterLockSlim();
    public static void Main()
    {
      Thread t_read1 = new Thread(new ThreadStart(WriteSomething));
      t_read1.Start();
      Console.WriteLine("{0} Create Thread ID {1} , Start WriteSomething", DateTime.Now.ToString("hh:mm:ss fff"), t_read1.GetHashCode());
      Thread t_read2 = new Thread(new ThreadStart(WriteSomething));
      t_read2.Start();
      Console.WriteLine("{0} Create Thread ID {1} , Start WriteSomething ", DateTime.Now.ToString("hh:mm:ss fff"), t_read2.GetHashCode());
      Thread t_write1 = new Thread(new ThreadStart(ReadSomething));
      t_write1.Start();
      Console.WriteLine("{0} Create Thread ID {1} , Start ReadSomething", DateTime.Now.ToString("hh:mm:ss fff"), t_write1.GetHashCode());
      Thread t_write2 = new Thread(new ThreadStart(ReadSomething));
      t_write2.Start();
      Console.WriteLine("{0} Create Thread ID {1} , Start ReadSomething", DateTime.Now.ToString("hh:mm:ss fff"), t_write2.GetHashCode());

    }
    static public void ReadSomething()
    {
      Console.WriteLine("{0} Thread ID {1} Begin EnterReadLock...", DateTime.Now.ToString("hh:mm:ss fff"), Thread.CurrentThread.GetHashCode());
      rwl.EnterReadLock();
      try
      {
        Console.WriteLine("{0} Thread ID {1} reading sth...", DateTime.Now.ToString("hh:mm:ss fff"), Thread.CurrentThread.GetHashCode());
        Thread.Sleep(5000);//模拟读取信息
        Console.WriteLine("{0} Thread ID {1} reading end.", DateTime.Now.ToString("hh:mm:ss fff"), Thread.CurrentThread.GetHashCode());
      }
      finally
      {
        rwl.ExitReadLock();
        Console.WriteLine("{0} Thread ID {1} ExitReadLock...", DateTime.Now.ToString("hh:mm:ss fff"), Thread.CurrentThread.GetHashCode());
      }
    }
    static public void WriteSomething()
    {
      Console.WriteLine("{0} Thread ID {1} Begin EnterWriteLock...", DateTime.Now.ToString("hh:mm:ss fff"), Thread.CurrentThread.GetHashCode());
      rwl.EnterWriteLock();
      try
      {
        Console.WriteLine("{0} Thread ID {1} writing sth...", DateTime.Now.ToString("hh:mm:ss fff"), Thread.CurrentThread.GetHashCode());
        Thread.Sleep(10000);//模拟写入信息
        Console.WriteLine("{0} Thread ID {1} writing end.", DateTime.Now.ToString("hh:mm:ss fff"), Thread.CurrentThread.GetHashCode());
      }
      finally
      {
        rwl.ExitWriteLock();
        Console.WriteLine("{0} Thread ID {1} ExitWriteLock...", DateTime.Now.ToString("hh:mm:ss fff"), Thread.CurrentThread.GetHashCode());
      }
    }
  }

可以同时读取数据，但只能一个线程进入写数据。