Socket Problem in Mutli-threaded Application *URGENT*

Hi guys,

I have a problem working with CSocket in a mutli-threaded application. Basically, I created my sockets in the main application, then passed the SOCKET handles to the my worker thread via my dialog class object (since CSocket objects asserts when they're passed directly to another thread).

After using the sockets in my worker thread, I want to be able to transfer the control of the sockets back to my main user interface (UI) thread. My problem lies in that after the worker thread ends and transfers the sockets back to my original UI thread, they're unable to work. ie: my sockets don't work on an OnReceive() notification anymore.


//------------- code begins --------
// defined elsewhere
HANDLE m_hSocket, m_hTCPSocket;
CSocket m_pSocket, m_pTCPSocket;


CClientDialogDlg::StartThread()
{
:
:
// my sockets are detached at this point
m_hSocket = m_pSocket->Detach();
m_hTCPSocket = m_pTCPSocket->Detach();
AfxBeginThread(WorkerThread, this);
}

UINT WorkerThread( LPVOID pParam )
{
// The follow code is a workaround the VC++ 6.0 bug (see article Q193101)
#ifndef _AFXDLL
#define _AFX_SOCK_THREAD_STATE AFX_MODULE_THREAD_STATE
#define _afxSockThreadState AfxGetModuleThreadState()

_AFX_SOCK_THREAD_STATE* pState = _afxSockThreadState;
if (pState->m_pmapSocketHandle == NULL)
pState->m_pmapSocketHandle = new CMapPtrToPtr;
if (pState->m_pmapDeadSockets == NULL)
      pState->m_pmapDeadSockets = new CMapPtrToPtr;
if (pState->m_plistSocketNotifications == NULL)
      pState->m_plistSocketNotifications = new CPtrList;
#endif
// end workaround

CClientDialogDlg* dlg = (CClientDialogDlg*) pParam;
CSocket Socket;
CSocket TCPSocket;
Socket.Attach(dlg->m_hSocket);
TCPSocket.Attach(dlg->m_hTCPSocket);
:
// Socket, TCPSocket operations
:
// WM_ATTACH_SOCKET message mapped to CClientDialogDlg::AttachSocket()
dlg->SendMessage(WM_ATTACH_SOCKET);
return 0;
}

void CClientDialogDlg::AttachSocket()
{
m_pSocket->Attach( m_hSocket );
m_pTCPSocket->Attach( m_hMmSocket );

// after this point my sockets cannot work anymore on the UI thread
}