Solved

Alternate to while loop in threads

Posted on 2004-09-25
1
195 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

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
How to know only "File created" with EventLog 3 35
sum28 challenge 31 117
Window placement 17 95
Thin secure Windows 10 5 107
Introduction: Dialogs (1) modal - maintaining the database. Continuing from the ninth article about sudoku.   You might have heard of modal and modeless dialogs.  Here with this Sudoku application will we use one of each type: a modal dialog …
If you use Adobe Reader X it is possible you can't open OLE PDF documents in the standard. The reason is the 'save box mode' in adobe reader X. Many people think the protected Mode of adobe reader x is only to stop the write access. But this fe…
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.

749 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