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Run Multiple Threads in Parallel

Posted on 2013-01-03

1 solution

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Last Modified: 2013-01-08

Hello Experts,

I'm using the following code to run a Thread in parallel to the program:

            Thread myThread = new System.Threading.Thread(delegate()
            {
                //Your code here
                System.Threading.Thread.Sleep(14000);
                close_window_by_handle(ie);
            });
            myThread.Start();

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In this code I need to wait 14 seconds ( according to the customer request )

the problem is when I run this code few times during 14 seconds it stuck

How do I enhance my code check if a thread is running, if YES it create a new thread in addition to the running one
else it use the Stopped thread

Thanks

Comment

Question by:madmare

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7 Comments

LVL 75

Expert Comment

by:käµfm³d 👽

ID: 387397682013-01-03

What do you mean by "else it use the Stopped thread?" A terminated thread cannot be restarted, and you must create a new Thread instance in that case.

Author Comment

by:madmare

ID: 387397752013-01-03

I'll fix my self

in any way create new Thread :)

Thanks

LVL 36

Expert Comment

by:Miguel Oz

ID: 387398022013-01-03

Is this a desktop app (eg. Winform) or Asp.net?
How many threads are you running in parallel in your App?

If this number is small (<20) then you can use ThreadPool.QueueUserWorkItem
else consider using TPL (.Net 4.0 up)

Note: Check TPL vs queueuserworkitem

Author Comment

by:madmare

ID: 387398152013-01-03

can you please give me the example for ThreadPool.QueueUserWorkItem ?

Thanks

LVL 36

Expert Comment

by:Miguel Oz

ID: 387398252013-01-03

Check the example to run the method ProcessFile at:
http://www.dotnetperls.com/threadpool

Author Comment

by:madmare

ID: 387399952013-01-03

Thanks mas

I looked again to the request, I think that TPL can be helpful for me

can you please help to convert my code to TPL

Thanks

LVL 36

Accepted Solution

by:Miguel Oz

Miguel Oz earned 500 total points

ID: 387501992013-01-07

using System.Threading.Tasks;

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Your code should look like:

            Parallel.Invoke(
                () => {
                    //Your code here
                System.Threading.Thread.Sleep(14000);
                close_window_by_handle(ie);
                }
            );

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Note: I use Parallel.Invoke because you are not returning any value.
If you are returning a value use:

Task<int> task1 = Task<int>.Factory.StartNew(() => DoWork());
// Get the results and write them out.
Console.WriteLine("Result ={0}", task1.Result);

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where

static int DoWork()
{
     //Your code here
     System.Threading.Thread.Sleep(14000);
     close_window_by_handle(ie);
     return 0;
}

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