Problems with threading

Question

I got some problem with two threads which do seem to deadlock

The idea is this:

p1 = threading.Thread(targest  =myClass.setData, args = mylist)
p1.start()
p2 = threading.Thread(target = myClass.takeData, args = mylist)
p2.start()

mylist is a list.

Everything works absolutely fine when either the list is almost empty or when only either p1 or p2 is running. If both run, they seem to deadlock. I have tried to lock them - to no avail.

setData has an infinite while-loop which resets data in mylist, whereas takedata has an infinite whileloop which reads data from mylist.

Is it possible to do what I try to do?

Instead of describing your code in fairly vague terms, why not show us an actual runnable example that demonstrates the problem? — NPE
– NPE, Commented Feb 12, 2013 at 12:30
Yeah it's possible. This is a common problem known as consumer-producer: en.wikipedia.org/wiki/Producer-consumer_problem — Adrián
– Adrián, Commented Feb 12, 2013 at 12:32
use the module queue. myClass.setData == queue.Queue.put myClass.takeData == queue.Queue.get — User
– User, Commented Feb 12, 2013 at 13:21

Community · Accepted Answer · 2017-05-23 11:56:24Z

1

As Adrián López says is a Producer-consumer problem. You have to use semaphores to lock the global data used by myClass.setData and myClass.takeData. Here you have a functional example to get ideas.

http://smherwig.blogspot.com.es/2012/09/producer-consumer-model-with-python.html

edited May 23, 2017 at 11:56

CommunityBot

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answered Feb 12, 2013 at 12:48

castledom04

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