Threading Problems

ok, i am developing a TCP/IP Client-Server application. Im currently working on transferring multiple files simultaneously from Server to Client.

Here is the code that receives data

Code:

---

//Global variable
        struct SepComm
        {
              char UnmanagedData[8192];
              int TotalSize;
              int Sock;
              void* param;
        };

---

Code:

---

case FD_READ:
{
        int SizeOfData = 0;
        int SockNO=0;

        for(SockNO=0;SockNO<=TotalConn;SockNO++)
        {
                  if (pMsg->wParam == sTemp[SockNO])
                        break;
        }

        ZeroMemory(SepCommParam.UnmanagedData,sizeof(SepCommParam.UnmanagedData));
        SizeOfData=recv(sTemp[SockNO],(char*)SepCommParam.UnmanagedData,sizeof(SepCommParam.UnmanagedData)/sizeof(SepCommParam.UnmanagedData[0]),0);

        if(SizeOfData == -1)
                goto Close_Sock;

        if(SizeOfData != -1)
                if(SizeOfData != 0)
                {
                        SepCommParam.TotalSize = SizeOfData;
                        SepCommParam.Sock = SockNO;
                        SepCommParam.param = this;
                        DWORD threadID;
                        HANDLE hThread = CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE)SeparateCommands, &SepCommParam, 0, &threadID);
                }
                                       
}
break;

---

the problem is (if you haven't noticed it already) that before the thread (SeparateCommands) is completed , a new data is arrived and it changes the SepComm variables and crashes the function.

whats is the best what to prevent or fix this issue?

thanks

A Rewrite of KB192570: An MFC Asynchronous Socket Example Done Right