[Tutor] Tread or threading

[Kent Johnson]

Michael Bernhard Arp Sørensen wrote:
> Hi there.
> 
> I've been reading in books and homepages about threads. Apparently, 
> "threading" is better than "thread", right?
> 
> I've been trying to write a simple proof of concept code using 
> "treading" inside a class. It was easely done with "thread", but it was 
> a lot harder with "threading". I want to be able to write a program like 
> this:
> 
> class myapp():
>   def __init__(self):
>     self.queue = queue.Queue()
>     self.lock = threading.Lock()

Queue.Queue is already threadsafe, you don't have to add a lock around 
it. Queue.get() and Queue.put() already have the semantics you are 
trying to achieve with the lock.


>   def main(self):
>     start_inputthread()
>     start_outputthread()
>     wait_for_both_threads_to_end()

      t1 = Thread(target=self.inputthread)
      # Note no parentheses after inputthread
      t1.start()
      t2 = Thread(target=self.outputthread)
      t2.start()
      t1.join()
      t2.join()

> All the examples I've seen was done by creating a class as a subclass of 
> threading.Thread. Isn't there a way to make individual methods a thread 
> like we do with the simpler "thread" module, but by using threading? 

Use the target parameter to Thread() to pass an individual method or 
function. Here is an example:
http://redclay.altervista.org/wiki/doku.php?id=projects:python-threading#example_4empy_full_queue

Kent