Advanced Python Programming

Message passing between several workers

As mentioned earlier, our goal is to have a structure where there are several processes constantly executing workers from a queue, and if a process finishes executing one worker, then it will pick up another. To do this, we will be utilizing a subclass of Queue called JoinableQueue, which will provide the additional task_done() and join() methods, as described in the following list:

• task_done(): This method tells the program that the calling JoinableQueue object is complete
• join(): This method blocks until all items in the calling JoinableQueue object have been processed

Now the goal here, again, is to have a JoinableQueue object holding all the tasks that are to be executed—we will call this the ...