DWORD WINAPI ThreadProc18(LPVOID pthread)
 {
 while(1)
 {
 WaitForSingleObject(hMutex,INFINITE);
 for (int i=0;i<10;i++)
 {
 CWnd * pWnd;
 pWnd =CWnd::FindWindow ( NULL, "UDP_test" );//UDP_test为对话框标题
CString str;
 str.Format("%d",i);
 pWnd->SetDlgItemText(IDC_EDIT1_xiancheng2,str);
 Sleep(100);
 }
 global_count++;
 ReleaseMutex(hMutex);
 }
 }
 DWORD WINAPI ThreadProc19(LPVOID pthread)
 {
 while(1)
 {
 WaitForSingleObject(hMutex,INFINITE);
 for (int i=0;i<10;i++)
 {
 CWnd * pWnd;
 pWnd =CWnd::FindWindow ( NULL, "UDP_test" );//UDP_test为对话框标题
CString str;
 str.Format("%d",i);
 pWnd->SetDlgItemText(IDC_EDIT1_xiancheng,str);
 Sleep(100);
 }
 global_count++;
 ReleaseMutex(hMutex);
 }

 }
程序中还使用了WSAAsyncSelect(m_socket_net,m_hWnd,UM_SOCK,FD_READ)，socket UDP通信，在
 case FD_READ:
 ...
                    WaitForSingleObject(hMutex,INFINITE);
 global_count++;
 ReleaseMutex(hMutex);
         break;
程序运行后，上面的两个线程工作正常，交替增加并显示，但是当接收到网络数据时，程序停在case FD_READ的WaitForSingleObject(hMutex,INFINITE);处，所有线程停止，程序死了，请问是怎么回事？十分感谢！