C#线程间同步的几种实现方式

本文详细介绍了C#中四种线程间同步的实现方式:信号量Semaphore,AutoResetEvent,ManualResetEvent以及CountDownEvent,分别阐述了它们的工作原理和使用场景。

摘要生成于 C知道 ,由 DeepSeek-R1 满血版支持, 前往体验 >

一、使用信号量

using System;
using System.Threading;

namespace SemaphoreDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            for(int i = 0; i <= 6; i++)
            {
                string threadName = "thread " + i;
                int secondsToWait = 2 + 2 * i;
                var t = new Thread(() => AccessDatabase(threadName, secondsToWait));
                t.Start();
            }

            Console.ReadKey();
        }
        //可同时有四个资源可访问
        static SemaphoreSlim _semaphore = new SemaphoreSlim(4);

        static void AccessDatabase(string name, int seconds)
        {
            Console.WriteLine("{0} waits to access a database", name);
            _semaphore.Wait();
            Console.WriteLine("{0} was granted an access to a database", name);

            Thread.Sleep(TimeSpan.FromSeconds(seconds));