using System;

using System.Threading;

public class ThreadTest3

{

public string lockString = "Hello";

private object obj = new object();

public void Print(string rank)

{

//lock을 걸어준 구문은 처음 쓰레드가 끝날때 까지 다른 쓰레드가 접근 금지

lock (obj)

{

for(int i=0; i < 5; i++)

{

for(int j=0; j < 5; j++)

{

Thread.Sleep(100);

Console.Write(",");

}

Console.WriteLine("{0}{1} ", rank, lockString);

}

}

}

public void FirstWork() { Print("F"); }

public void SecondWork() { Print("S"); }

}

class TestMain

{

[MTAThread]

public static void Main()

{

ThreadTest3 t = new ThreadTest3();

Thread first = new Thread(new ThreadStart(t.FirstWork));

Thread second = new Thread(new ThreadStart(t.SecondWork));

first.Start();

second.Start();

}

}