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Pointer, point to pointer, again

Posted on 2007-11-25
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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.
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Question by:DJ_AM_Juicebox
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Accepted Solution

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

In short: Yes.

Hard to add anything, you wrote it all.
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Author Comment

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

Thanks
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LVL 86

Expert Comment

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