How do I create multiple threads based on number of files ?

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I have googled too much for this particular problem .What am trying to do is reading the multiple files from file DialogBox and I want to create number of threads based on number of files selected by user in file DialogBox i.e. if user has selected 2 threads then I should create 2 threads only and each indivisual thread should process the single file parallerly. Is this possible ?

What I have tried:

I have created a file dialog box . I am reading those files in file Dialog box and applied Lock on reading those files . But am not getting how do I run it parallely for multiple threads.

Posted 5-Feb-18 0:59am

Ni!E$H_WAGH

Updated 6-Feb-18 7:51am

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johannesnestler 5-Feb-18 7:22am

Yes it should be possible (if this is a "good idea" depends on your context - from my experience IO-Bound multithreading may be not so a great thing).
So what's your specific problem? creating the threads? reading the files? You didn't show any code to guess what could be your obstacle.
Anyway: From FileDialog you get a list of file-names, Loop through them create a thread for processing for each. Let them run and syncronize. I'd use TaskParallelLib (Tasks) instead of old style thread creation....

Ni!E$H_WAGH 6-Feb-18 8:22am

What I expect is to run those threads parallely means at the same time for different files . but it gives error when I don't use Lock , error says Memory currupt.

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Maciej Los · Answer 1 · 2018-02-05T01:22:00

Solution 1

You have to loop through the collection of files and have to create new thread for every single file you want to process.

For further details, please see:
Threading (C#) | Microsoft Docs[^]
Multithreaded Applications (C#) | Microsoft Docs[^]
Walkthrough: Multithreading with the BackgroundWorker Component (C#) | Microsoft Docs[^]

Posted 5-Feb-18 1:22am

Maciej Los

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CPallini 5-Feb-18 7:41am

5.

Maciej Los 5-Feb-18 7:44am

Thank you, Carlo.

CPallini · Answer 2 · 2018-02-05T01:25:00

Quote:
if user has selected 2 threads then I should create 2 threads only and each indivisual thread should process the single file parallerly. Is this possible ?

I assume you meant: "if the user selects 2 files then I should create 2 threads. Each thread must process a file. Is it possible?"
Yes, it is possible of course.
I suggest you reading a tutorial on multitasking in C#.

pt1401 · Answer 3 · 2018-02-05T02:07:00

Solution 3

I don't know your reason for specifying 1 file = 1 thread, maybe there's a good reason for it.
But if your reason is just to perform file processing in the background without encumbering the UI thread, investigate using async/await to perform the time-consuming I/O stuff.
Leaving the UI free & responsive.

Posted 5-Feb-18 2:07am

pt1401

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Ni!E$H_WAGH 6-Feb-18 8:28am

but depend on I/O.I have to process further and I think the further processing of files depends on reading of PDF files . So is that possible that I could hold reading and process on the PDF file ( which is I think not available untill I read ).

pt1401 · Answer 4 · 2018-02-06T07:48:00

Solution 4

If you want to multithread I/O-dependent processes, you may want to investigate I/O Completion Ports [^]

Posted 6-Feb-18 7:48am

pt1401

How do I create multiple threads based on number of files ?

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