serial and threads

[Peter Hansen]

Silke wrote:
> I'm trying to write a program in python using the modules
> 'serialwin32' and 'thread' to create one thread that writes to a
> serial port and another one that reads from it at 'the same time'. My
> definitions are
> 
> def NetworkToSerial(input):
>         s.write(binascii.unhexlify(input))        
>         print "SENT: %s" % input                  
> 
> def SerialToNetwork():
>                 result = s.read(1)
>                 print "RECEIVED:"
>                 print binascii.hexlify(result) 
> 
> and I call them with
> 
> thread.start_new_thread(NetworkToSerial, (command,))             
> thread.start_new_thread(SerialToNetwork, ())
> 
> The first one seems to run fine, but for the second one I get the
> error message 'ClearCommError', 'the handle is invalid'.

How do you open the serial port and pass the "handle" to
the two threads?  Or are you just using a global "s"?