c# how to thread through loops

Question

Hello I was wondering how people make loops threaded for example

for(int i = 0; i<10; i++)
{
     Console.WriteLine(i);
}

Is it possible to have one thread for every loop? so, Thread 1: 0 Thread 2: 1 Thread 3: 2 ect..

and if so, how would I cap the threads ?

Console.Writeline will undo your threading attempts as it will block, check https://gist.github.com/timgaunt/3620149 — Keith Nicholas, Nov 03 '16 at 02:42
also, you may want to use parallel loops https://msdn.microsoft.com/en-us/library/dd460713(v=vs.110).aspx — Keith Nicholas, Nov 03 '16 at 02:45
Thank you, I didn't know the name of it so I wasn't sure if i'd find it — , Nov 03 '16 at 02:47

score 4 · Accepted Answer · edited May 23 '17 at 12:33

4

What you are looking for is the parallel for

This:

for(int i=0; i <=10; i++) 
{  
    Console.WriteLine(i); 
}

Becomes this:

Parallel.For(0, 10, new ParallelOptions { MaxDegreeOfParallelism = 5 }, i =>
{
    Console.WriteLine(i);
});

This will spawn one task per iteration of the loop. One of the overloads of parallel takes in the parallel options which lets set the maximum number of tasks running cuncurrently. Official docs: https://msdn.microsoft.com/en-us/library/dd992418(v=vs.110).aspx

Note there is some difference between a thread and a task in C#: What is the difference between task and thread?

If you have a list of items to process I recommend the parallel foreach: https://msdn.microsoft.com/en-us/library/dd460720(v=vs.110).aspx

edited May 23 '17 at 12:33

Community

1
1

answered Nov 03 '16 at 02:50

Wallace

5,319
4
17
9

1

You've suggested that this solution does what the OPs wants, but you haven't answered the OPs specific questions. – Enigmativity Nov 03 '16 at 02:55
1

I didn't even notice the second part of the question, fixed answer – Wallace Nov 03 '16 at 03:06
Thank you @Wallace – Nov 03 '16 at 03:10

c# how to thread through loops

1 Answers1