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pythonmultithreading
Nishant
Nishant

Reputation: 21914

What is the main difference of thread.join vs queue.join?

In Python, what is the difference between using a thread.join vs a queue.join? I feel that it could both do the same job in some scenarios. Especially if there is a one-one correpodence between thread spawned and item picked from the queue for a job. Is it something like if you are going to use Threading on a queue, it is best to depend on queue.join and if you are just doing something in paralelly where there is no queue data structure used, but its something like a list you could use thread.join? Ofcourse in the scenario of thread.join you need to mention all the threads spawned.

Also just as an aside is queue something you would normally use for consuming input? I think in the scenario of chaining inputs for another job it makes sense to use as an output as well, but in general queue is for processing input? Can someone clarify?

Upvotes: 2

Views: 1264

Answers (1)

cdonts
cdonts

Reputation: 9599

Queue.join will wait for the queue to be empty (actually that Queue.task_done is called for each item after processing). Thread.join will block until all threads terminates. The behavior using one or other might be similar if all the threads take items from the queue, make a task and return when there's nothing left. However you can still have threads which don't use a queue at all, thus Queue.join would be useless.

Upvotes: 2

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