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DWORD WINAPI read_thread(HANDLE hCom ){

  BYTE Byte;

  HANDLE mutex;

  DWORD dwBytesTransferred,dwCommModemStatus ;

  CRITICAL_SECTION cs;

  //mutex = OpenMutex(0, 0, "rs232mutex");

  while (hCom != INVALID_HANDLE_VALUE) 

  {

    //WaitForSingleObject(mutex,INFINITE);

    WaitCommEvent (hCom, &dwCommModemStatus, 0);

    SetCommMask (hCom, EV_RXCHAR | EV_CTS | EV_DSR | EV_RING );

    if(dwCommModemStatus & EV_RXCHAR){  

    do{

          // Read the data from the serial port.

          ReadFile (hCom, &Byte, 1, &dwBytesTransferred, 0);

          // Display the data read.

          if (dwBytesTransferred == 1){

        if(Byte == '\r')

          Byte = '\n';

        printf("%c",Byte);

      }

      } while (dwBytesTransferred == 1);

      //ReleaseMutex(mutex);

      }

    }

    return 0;

}