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Beginner's Guide to Threading in .NET: Part 3 of n

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10 Aug 2008CPOL19 min read 347.3K   2.6K   376  
This article is all about how to control the synchronization of different threads.
using System;
using System.Threading;

namespace OrderSystem
{

    /// <summary>
    /// This simple class demonstrates the usage of an AutoResetEvent
    /// to create some synchronized threads that will carry out the 
    /// following
    /// -CreateOrder
    /// -SaveOrder
    /// -PrintOrder
    /// 
    /// Where it is assumed that these 3 task MUST be executed in this
    /// order, and are interdependant
    /// </summary>
    public class Program
    {

        public static Thread CreateOrderThread;
        public static Thread SaveOrderThread;
        public static Thread PrintOrderThread;
        //This AutoResetEvent starts out non-signalled
        public static AutoResetEvent ar1 = new AutoResetEvent(false);
        public static AutoResetEvent ar2 = new AutoResetEvent(false);

        static void Main(string[] args)
        {

            CreateOrderThread = new Thread((ThreadStart)delegate
            {
                Console.WriteLine(
                    "CreateOrderThread is creating the Order");
                //calling sleep to simulate some work
                Thread.Sleep(5000);
                //alert waiting thread(s)
                ar1.Set();
            });

            SaveOrderThread = new Thread((ThreadStart)delegate
            {
                //wait for AutoResetEvent ar1, this will wait for ar1
                //to be signalled from some other thread
                ar1.WaitOne();
                Console.WriteLine(
                    "SaveOrderThread is saving the Order");
                //calling sleep to simulate some work
                Thread.Sleep(5000);
                //alert waiting thread(s)
                ar2.Set();
            });

            PrintOrderThread = new Thread((ThreadStart)delegate
            {
                //wait for AutoResetEvent ar1, this will wait for ar1
                //to be signalled from some other thread
                ar2.WaitOne();
                Console.WriteLine(
                    "PrintOrderThread is printing the Order");
                //calling sleep to simulate some work
                Thread.Sleep(5000);
            });

            CreateOrderThread.Name = "CreateOrderThread";
            SaveOrderThread.Name = "SaveOrderThread";
            PrintOrderThread.Name = "PrintOrderThread";
            CreateOrderThread.Start();
            SaveOrderThread.Start();
            PrintOrderThread.Start();
            Console.ReadLine();
        }
    }
}

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


Written By
Software Developer (Senior)
United Kingdom United Kingdom
I currently hold the following qualifications (amongst others, I also studied Music Technology and Electronics, for my sins)

- MSc (Passed with distinctions), in Information Technology for E-Commerce
- BSc Hons (1st class) in Computer Science & Artificial Intelligence

Both of these at Sussex University UK.

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