Is it possible to run two "while 1:" loops in two threadings respectively?

[Diez B. Roggisch]

zxo102 schrieb:
> Hi,
>    I would like to combine two python applications into a single one
> with two threadings. Both of them have a "while 1:" loop respectively.
> For example, one application is to monitoring serial port 'com1' and
> another application is a TCP/IP server which has used threadings
> already. I write the following demo code but it does not work right.
> It stays in the first "while 1:" and never thingOne.start(). The
> second threading never be started.
> Any ideas?
> 
> Thanks a lot.
> 
> Ouyang
> #################################################################
> import threading, time
> class serial_port_com1:
>   def spc(self):
>      i = 0
>      while 1:
> 	time.sleep(5)
> 	print "%d: hello, I am here in spc()"%i
> 	i += 1
> 
> class TCP_IP:
>   def tcpip(self):
>      i = 0
>      while 1:
> 	time.sleep(5)
> 	print "%d: hello, I am here in tcpip()"%i
> 	i += 1
> 
> class ThreadOne ( threading.Thread ):
>    def run ( self ):
>       print 'Thread', self.getName(), 'started.'
>       time.sleep ( 5 )
>       print 'Thread', self.getName(), 'ended.'
> 
> class ThreadTwo ( threading.Thread ):
>    def run ( self ):
>       print 'Thread', self.getName(), 'started.'
>       thingOne.join()
>       print 'Thread', self.getName(), 'ended.'
> 
> if __name__=="__main__":
>    spc  = serial_port_com1()
>    tcpip = TCP_IP()
>    thingOne = ThreadOne(target=spc.spc())
>    thingOne.start()
>    thingTwo = ThreadTwo(target=tcpip.tcpip())
>    thingTwo.start()
> 

There are several problems here. First of all, one either subclasses
Thread and implements run - then your code should look like this:


class ThreadTwo(Thread):
       def run(self):
             tcpip.tcpip()


Or you don't subclass Thread and pass a target. But that target must be
a function. You don't pass a function, you call it!!

Look at this:

Thread(target=tcpip.tcpip)

Note the missing parentheses!

Apart from that, you should seriously consider applying a consistent
naming style to your code.


Diez