Solved

Pointer, point to pointer, again

Posted on 2007-11-25
3
141 Views
Last Modified: 2010-04-01
Hi everyone,

Sorry to beat this subject to death, I want to make sure I am right in doing this. Here's my setup:

struct ThreadData {
    ThreadData (Connection* pConnection)
    {
         m_pConnection = pConnection;
    }
    Connection* m_pConnection;
    // some other junk here too.
};

int main()
{
     while (connections)
     {
          Connection* pConnection  =  0;
          ThirdPartyLibConnectFunction(pConnection); // this calls malloc inside on pConnection.

           // Now I want a thread to handle the connection.
           ThreadData* pThreadData = new ThreadData(pConnection);
           RunThread(pThreadData);
      }
}

void RunThread(void* pParam)
{
     auto_ptr<ThreadData*> pData((ThreadData*)pParam);

     // Do stuff with the connection object now.
     pData->m_pConnection->Whatever();
}
         
My question is, is my use of pointers here doing what I want? (tought to read my mind I know). Ok I want the data structure allocated in the main thread to be used only by the handler thread, and to be cleaned up in the thread handler. I think this is doing it right?:

     m_pConnection = pConnection;

So the actual memory is being allocated in the main thread for it, but the main thread cannot touch it anymore after the current iteration of the while loop goes through. Then the handler thread can play with it however it wants to and can deallocate it properly.

Is this correct?

Thanks for your help as always.
0
Comment
Question by:DJ_AM_Juicebox
  • 2
3 Comments
 
LVL 86

Accepted Solution

by:
jkr earned 500 total points
ID: 20346865
>>Is this correct?

In short: Yes.

Hard to add anything, you wrote it all.
0
 

Author Comment

by:DJ_AM_Juicebox
ID: 20346893
Alright thanks just needed someone to proof read it,

Thanks
0
 
LVL 86

Expert Comment

by:jkr
ID: 20346944
You're most welcome ;o)
0

Featured Post

ScreenConnect 6.0 Free Trial

Discover new time-saving features in one game-changing release, ScreenConnect 6.0, based on partner feedback. New features include a redesigned UI, app configurations and chat acknowledgement to improve customer engagement!

Question has a verified solution.

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

Errors will happen. It is a fact of life for the programmer. How and when errors are detected have a great impact on quality and cost of a product. It is better to detect errors at compile time, when possible and practical. Errors that make their wa…
Article by: SunnyDark
This article's goal is to present you with an easy to use XML wrapper for C++ and also present some interesting techniques that you might use with MS C++. The reason I built this class is to ease the pain of using XML files with C++, since there is…
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.
The viewer will be introduced to the technique of using vectors in C++. The video will cover how to define a vector, store values in the vector and retrieve data from the values stored in the vector.

831 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