using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Runtime;
using System.Runtime.CompilerServices;
using System.Security;
using System.Text;
using System.Threading;
public class MainClass
{
public static void Main()
{
ReaderWriterLock rwLock = new ReaderWriterLock();
rwLock.AcquireReaderLock(250);
if (!rwLock.IsReaderLockHeld)
return;
Console.WriteLine("Reader lock held");
LockCookie cookie = rwLock.UpgradeToWriterLock(250);
if (rwLock.IsWriterLockHeld)
{
Console.WriteLine("Upgraded to writer lock");
rwLock.DowngradeFromWriterLock(ref cookie);
}
rwLock.ReleaseReaderLock();
}
}