Solved

Alternate to while loop in threads

Posted on 2004-09-25
1
172 Views
Last Modified: 2013-11-20
Hello,

 

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)
{
while(TRUE)
{

     // 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.


Thanks
Madhavi
0
Comment
Question by:l_madhavi
1 Comment
 
LVL 44

Accepted Solution

by:
AndyAinscow earned 30 total points
ID: 12155665
UINT ThreadFunction(LPVOID lp)
{
bool bContinue;
while(TRUE)
{
bContinue = true;
  while(bContinue)
{
//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
}
}
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Suggested Solutions

Introduction: Database storage, where is the exe actually on the disc? Playing a game selected randomly (how to generate random numbers).  Error trapping with try..catch to help the code run even if something goes wrong. Continuing from the seve…
Introduction: Dialogs (2) modeless dialog and a worker thread.  Handling data shared between threads.  Recursive functions. Continuing from the tenth article about sudoku.   Last article we worked with a modal dialog to help maintain informat…
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.
Video by: Mark
This lesson goes over how to construct ordered and unordered lists and how to create hyperlinks.

920 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

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now