通过object可以锁定线程

namespace DeadLock
{
    using System;
    using System.Threading;

    class Program
    {
        static void Main(string[] args)
        {
            object lock1 = new object();
            object lock2 = new object();

            new Thread(
                () => {
                    lock (lock1) {
                        Console.WriteLine("lock1 obtained");
                        Thread.Sleep(2000);
                        lock (lock2) { // the worker thread will be blocked because main thread hasn't released lock2
                            Console.WriteLine("lock2 obtained");
                        }
                    }
                }
            ).Start();

            lock(lock2)
            {
                Console.WriteLine("main thread lock2 obtained");
                Thread.Sleep(2000);
                lock (lock1) // main thread will be blocked because worker thread hasn't released lock1
                {
                    Console.WriteLine("lock1 obtained");
                }
            }
        }
    }
}