通过锁字符串达到控制并发的效果C#

最新推荐文章于 2025-08-18 19:34:46 发布

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最新推荐文章于 2025-08-18 19:34:46 发布

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CC 4.0 BY-SA版权

文章标签： runtime

原文链接：http://www.cnblogs.com/sharing1986687846/p/10300416.html

本文通过C#代码示例，详细解析了锁(lock)机制如何作用于字符串的内存地址，展示了当使用相同字符串作为锁对象时，.NET框架如何确保线程安全，并深入探讨了new string创建的字符串在内存中的独特行为。

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lock锁的是内存地址

而.net有内部机制使得相同的字符串内存地址是相同的(new string)除外

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;

namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {

            List<string> keyList = new List<string> { "key1", "key2", "key1", "key1", "key1", "key1", };

            keyList.ForEach(u =>
            {
                ThreadPool.QueueUserWorkItem(s =>
                {
                    Test.lockTestByString(u);
                });

            });

            Console.Read();

        }
    }


    public class Test
    {

        public static void lockTestByString(string key)
        {
            lock (key)
            {
                GCHandle handle = GCHandle.Alloc(key, GCHandleType.Pinned);
                //获取内存地址
                IntPtr address = handle.AddrOfPinnedObject();

                Console.WriteLine("上锁2s key=" + key + " 内存地址：" + address);
                Thread.Sleep(2000);
                Console.WriteLine("解锁");

            }
        }

    }


}

运行效果图：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;

namespace ConsoleApp
{
    //class Program
    //{
    //    static void Main(string[] args)
    //    {

    //        List<string> keyList = new List<string> { "key1", "key2", "key1", "key1", "key1", "key1", };

    //        keyList.ForEach(u =>
    //        {
    //            ThreadPool.QueueUserWorkItem(s =>
    //            {
    //                Test.lockTestByString(u);
    //            });

    //        });

    //        Console.Read();

    //    }
    //}


    public class Test
    {

        public static void lockTestByString(string key)
        {
            lock (key)
            {
                GCHandle handle = GCHandle.Alloc(key, GCHandleType.Pinned);
                //获取内存地址
                IntPtr address = handle.AddrOfPinnedObject();

                Console.WriteLine("上锁2s key=" + key + " 内存地址：" + address);
                Thread.Sleep(2000);
                Console.WriteLine("解锁");

            }
        }

    }


    class Program
    {
        static void Main(string[] args)
        {

            List<string> keyList = new List<string> { new string('k', 1), new string('k', 1), new string('k', 1), new string('k', 1) };

            keyList.ForEach(u =>
            {
                ThreadPool.QueueUserWorkItem(s =>
                {
                    Test.lockTestByString(u);
                });

            });

            Console.Read();
        }
    }







}