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Asynchronous Threading, First Code

Synchronous threading will execute each thread/command in the order they have been created/started

Suppose there are 4 threads A, B, C, D
Application Starts at 10:00:00

time: 10:00:00: -> Start thread A (will run for 5 seconds)
time: 10:00:05: -> Start thread B (will run for 10 seconds)
time: 10:00:15: -> Start Thread B1 (will run for 5 seconds)
time: 10:00:20: -> Start thread C (will run for 15 seconds)

end application: total run time will be 35 seconds

Asynchronous threading will run the threads at the same time/ parallel processing, or we can say it will take the thread that is available at the earliest.

Application Starts at 10:00:00

time: 10:00:00: -> Start thread A (will run for 5 seconds) / Start thread B (will run for 10 seconds) / Start thread C (will run for 15 seconds)
time: 10:00:10: -> Start Thread B1 (will run for 5 seconds)

end application: total run-time will be 15 seconds (because the longest run-time is thread C)

So Async Threading save time, effective as well as well.




Example:-

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Net;

namespace thread_asynchronous
{
class Program
{
static void Main(string[] args)
{
DownloadAynchronously();

Console.WriteLine("waiting to finish on thread ...{0}...", Thread.CurrentThread.ManagedThreadId);

Console.ReadLine();

}

private static void DownloadAynchronously()
{
string[] urls =
{
"http://www.techcrunch.com/",
"http://www.isohunt.com/",
"http://www.google.com",
"http://www.developerscloud.org"

};

foreach (var url in urls)
{
var thread = new Thread(download);
thread.Start(url);
}

}

private static void download(object url)
{
var client = new WebClient();
var html = client.DownloadString(url.ToString());
Console.WriteLine("download{0} chars from {1} on thread {2}...",
html.Length, url, Thread.CurrentThread.ManagedThreadId);

}
}
}




Thanks, I hope you understand the basics of Async Threading.


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