SyncTest.cs

using System;
using System.Threading;
using System.Threading.Tasks;

namespace ThreadsTest
{
	static class Program
	{
		static readonly object syncRoot = new object();
		static readonly int[] array = new int[] { 1,2,3,4,5,6 };
		static int i = 0;
		static void thread()
		{
			lock( syncRoot )
			{
				for( ; i < array.Length; i++ )
				{
					Monitor.Pulse( syncRoot );
					Monitor.Wait( syncRoot );
					Console.WriteLine( "Thread {0}: {1}", Environment.CurrentManagedThreadId, array[ i ] );
				}
			}
		}

		static void Main( string[] args )
		{
			Action act = thread;
			Task.WhenAll( Task.Run( act ), Task.Run( act ) ).Wait();
		}
	}
}