How to run two for loops at the same time in a function C# .NET?

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I have 2 for loops in a function, doing different jobs and running one after another. How can I run them in parallel(both loops do there jobs at same time) ?

public void func()
{
   for(i=0;i<10;i++)
   {

   }

   for (j=0;j<10;j++)
   {

   }
}

What I have tried:

I have 2 for loops in a function, doing different jobs and running one after another. How can I run them in parallel(both loops do there jobs at same time) ?

Posted 26-Feb-18 23:06pm

Akhil Jain

Updated 3-Mar-18 0:03am

v2

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4 solutions

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F-ES Sitecore · Answer 1 · 2018-02-26T23:27:00

public void func()
{
    // This code is on thread 1

    Thread ta = new Thread(new ThreadStart(LoopA)); // create thread 2 for LoopA
    Thread tb = new Thread(new ThreadStart(LoopB)); // create thread 3 for LoopB

    ta.Start(); // Run LoopA on thread 2
    tb.Start(); // Run LoopB on thread 3

    // Join makes this thread wait until the thread being joined to has finished

    ta.Join(); // wait for thread 2 to finish
    tb.Join(); // now wait for thread 3 to finish

    // From this point on we know that both loops have completed
}

public void LoopA()
{
    for (int i = 0; i < 1000; i++)
    {
        Console.WriteLine("i = " + i.ToString());
    }
}

public void LoopB()
{
    for (int j = 0; j < 1000; j++)
    {
        Console.WriteLine("j = " + j.ToString());
    }
}

CPallini · Answer 2 · 2018-02-26T23:27:00

Solution 2

What about multiple threads (see, for instance Multi-threading in .NET: Introduction and suggestions[^])?

Posted 26-Feb-18 23:27pm

CPallini

George Swan · Answer 3 · 2018-03-03T00:04:00

What about employing the Task-Based Asynchronous Pattern?

C#

private static async Task MainAsync()

    {
        await MyMethodAsync();
    }

private static async Task MyMethodAsync()
    {
        //start the tasks
        const int count = 10;
        Task<string> loopATask = Task.Run(() => LoopA(count));
        Task<string> loopBTask = Task.Run(() => LoopB(count));
        //await them to complete
        string resultA = await loopATask;
        string resultB = await loopBTask;
        Console.WriteLine(resultA + resultB);
    }


    public static string LoopA(int count)
    {
        for (int i = 0; i < count; i++)
        {
            Console.WriteLine("LoopA " + i);
        }
        return "LoopA has finished ";
    }

    public static string LoopB(int count)
    {
        for (int i = 0; i < count; i++)
        {
            Console.WriteLine("LoopB " + i);
        }
        return "LoopB has finished ";
    }

Ashok Kumar RV · Answer 4 · 2018-03-02T01:14:00

Solution 4

If you meant:

public void func()
{
   for(i=0;i<10;i++)
   {
        aaa();
        bbb();
        ccc();
   }

   for (i=0;i<10;i++)
   {
       yyy();
       zzz();
   }
}

then it can be replaced to :

public void func()
{
   for(i=0;i<10;i++)
   {
        aaa();
        bbb();
        ccc();

        yyy();
        zzz();
   }

}

Posted 2-Mar-18 1:14am

Ashok Kumar RV

Comments

Richard MacCutchan 2-Mar-18 7:52am

That is not running them at the same time.

Ashok Kumar RV 2-Mar-18 11:34am

Anyone learned first lesson in multithreading will be able to this task. Obviously he has to study multithreading. Since his question seemed innocent i hoped my answer would suffice.

Richard MacCutchan 2-Mar-18 12:14pm

Your "answer" has nothing to do with threading, and gives no suggestions that would help someone new to the subject.

How to run two for loops at the same time in a function C# .NET?

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