6.4 Parallelism: threads and events, C#

6.4 Parallelism: threads and events

//6.4 Parallelism: threads and events
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Threading;
using System.Threading.Tasks;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //It's important to realize that event handlers run on the same thread which triggers them.
            //That's because triggering the event is merely calling all the methods that subscribed to the event in the order of subscription.
            
            var job = new Job();
            job.SomeEvent += () =>
            {
                Console.WriteLine("This code runs on the thread that triggered the event: {0}", Thread.CurrentThread.ManagedThreadId);
            };
            Console.WriteLine("Main thread: {0}", Thread.CurrentThread.ManagedThreadId);
            var task = Task.Run(() => job.Fire());
            task.Wait();
        }
    }
    
    public class Job
    {
        public delegate void SomeDelegate();
        public event SomeDelegate SomeEvent;
        
        public void Fire()
        {
            Console.WriteLine("I'm a newly started thread: {0}", Thread.CurrentThread.ManagedThreadId);
            if(SomeEvent != null)
            {
                SomeEvent(); //trigger the event handler(s)
            }
        }
    }
}


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