Alternate to while loop in threads

Posted on 2004-09-25
Last Modified: 2013-11-20


I am new to Mulithreading. In my project I am working with multiple threads. Since I haven’t worked with threads before, I am facing many hurdles. Can any one please guide me or give some hints.

 I am explaining in brief about the threads used by me in my project.


1st thread:  Filter Thread

Is started at application start up.

Filters each line read from file( Log data is read from file)

I have used CCriticalSection and CSingleLock to lock the data access here as this

LIST is accessed in Display thread.

Adds the data to the LIST from top.

This thread has to run continuously till the application end.


2nd thread:Display Thread

Is started at application start up.

Displays each line filtered by Filter thread

I have used CCriticalSection and CSingleLock to lock the data access here as this

LIST is accessed in Filter thread.

Retrieves the data from the LIST from bottom.

Deletes the data from the list after display.

This thread has to run continuously till the application end.


3rd Thread: Monitor Thread      

Is started at application start up.

This thread has to continuously check if new records are added to the file ( Here another external application will add records to the file)

If new records are added, it notifies the Filter Thread, which fetches the added records, filters them and gives to Display thread for displaying.

Since all the above three threads have to run continuously, I had used sleep in all the threads as shown below.

UINT ThreadFunction(LPVOID lp)

     // Do the work


The result of this is that CPU time is 100% used because of the While loop.  

Can anyone please suggest an alternative for while loop in the other two threads.

Question by:l_madhavi
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
1 Comment
LVL 44

Accepted Solution

AndyAinscow earned 30 total points
ID: 12155665
UINT ThreadFunction(LPVOID lp)
bool bContinue;
bContinue = true;
//Check for new line(s) file  if none found set bContinue to false to fall through to outer loop
     sleep(1000);  //set thread into sleep state for 1 second

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Here is how to use MFC's automatic Radio Button handling in your dialog boxes and forms.  Beginner programmers usually start with a OnClick handler for each radio button and that's just not the right way to go.  MFC has a very cool system for handli…
In this article, I'll describe -- and show pictures of -- some of the significant additions that have been made available to programmers in the MFC Feature Pack for Visual C++ 2008.  These same feature are in the MFC libraries that come with Visual …
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
If you’ve ever visited a web page and noticed a cool font that you really liked the look of, but couldn’t figure out which font it was so that you could use it for your own work, then this video is for you! In this Micro Tutorial, you'll learn yo…

707 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question