C#死鎖案例代碼

C#死鎖案例代碼

簡介：

如下代碼實作建立兩個線程t1和t2，分别起初配置設定占用lock1和ock2資源。當一個線程t1占用資源lock1時，再去請求另外一個資源lock2時，此時由于另外一個線程t2在正占用資源t2，請求失敗，等待釋放資源。同時t2又送出請求資源lock1，但是lock1又被t1占用，沒有釋放，也隻能進行等待。此時兩個線程隻能等待一直等待對方釋放資源，這就稱之為死鎖。

namespace Deadlock
{
    class DL
    {
        int field1 = 0;
        int field2 = 0;
        private object lock1 = new int[1];
        private object lock2 = new int[1];

        public void First(int val)
        {
            lock (lock1)
            {
                Console.WriteLine("First: Acquired lock 1: "
                    + Thread.CurrentThread.GetHashCode() + " Now Sleeping.");
                
                //Try commenting Thread.Sleep()
                Thread.Sleep(1000);//此時t2線程占用資源

                Console.WriteLine("First: Acquired lock 1: "
                    + Thread.CurrentThread.GetHashCode() + " Now wants lock2.");

                //當請求鎖lock2時，lock被t2線程占用，等待釋放
                lock (lock2)
                {
                    Console.WriteLine("First: Acquired lock 2: "
                        + Thread.CurrentThread.GetHashCode());
                    field1 = val;
                    field2 = val;
                }
            }
        }

        public void Second(int val)
        {
            lock (lock2)
            {
                Console.WriteLine("Second: Acquired lock 2: "
                    + Thread.CurrentThread.GetHashCode());
                //當請求鎖lock1時，lock1被t1線程占用，等待釋放
                lock (lock1)
                {
                    Console.WriteLine("Second: Acquired lock 1: "
                        + Thread.CurrentThread.GetHashCode());
                    field1 = val;
                    field2 = val;
                }
            }
        }
    }

    public class MainApp
    {
        DL d = new DL();

        public static void Main()
        {
            MainApp m = new MainApp();
            Thread t1 = new Thread(new ThreadStart(m.Run1));
            t1.Start();
            Thread t2 = new Thread(new ThreadStart(m.Run2));
            t2.Start();
            Console.ReadLine();
        }

        public void Run1()
        {
            this.d.First(10);
        }

        public void Run2()
        {
            this.d.Second(10);
        }
    }
}      

本文來自部落格園，作者：農碼一生，轉載請注明原文連結：https://www.cnblogs.com/wml-it/p/14798281.html

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