I am trying to create 3 threads within each of 2 processes and share a queue of the type multiprocessing.JoinableQueue among all threads. The worker_func function simply creates the threads while the thread_func function prints out the values it gets from the queue. The program gets stuck somewhere in the time.sleep or in the get() method of queue. What am
Tag: queue
Python: will a thread ever unblock while hanging on a `Queue.get(block=True)` call if the queue is suddenly destroyed from another thread/process?
TLDR: Would a blocking get be unblocked by a queue that would be terminated in some way? Long question: Okay, so I know that the thread will hang if the queue (multiprocessing.Queue) remains empty forever while trying to fetch something from it with a blocking get. But suppose now that in another thread or process, I close the queue with
What is the difference between deque( [1,2,3] ) and deque.append( [1,2,3] )?
I have noticed that the following incurs an iterable error. But the code below works which I thought the same operation: What is the difference between the two ways above? Thanks for your help in advance. Answer q.popleft() returns the first element of the deque. In the first case it is int and in the second it is a list
FilterStore queue
I have a FilterStore and during my simulation there is a queue for the FilterStore.Get event at some times. Now I have two questions: Is there a way to see the actual elements in the queue, not just the object number? With FilterStore.get_queue I get this output: [FilterStoreGet() object at 0x221a47c6080, FilterStoreGet() object at 0x221a47c6eb8]. But I would like a
How to create a delayed queue in RabbitMQ?
What is the easiest way to create a delay (or parking) queue with Python, Pika and RabbitMQ? I have seen an similar questions, but none for Python. I find this an useful idea when designing applications, as it allows us to throttle messages that needs to be re-queued again. There are always the possibility that you will receive more messages
Can I get an item from a PriorityQueue without removing it yet?
I want to get the next item in queue but I don’t want to dequeue it. Is it possible in Python’s queue.PriorityQueue? From the docs, I don’t see how can it be done Answer When you get item form the queue as per theory it will remove from the queue. You have to write your own function which will give
Fast way to remove a few items from a list/queue
This is a follow up to a similar question which asked the best way to write and it seems the consensus was on something like However, I think if you are only removing a few items, most of the items are being copied into the same object, and perhaps that is slow. In an answer to another related question, someone
Can I use a multiprocessing Queue in a function called by Pool.imap?
I’m using python 2.7, and trying to run some CPU heavy tasks in their own processes. I would like to be able to send messages back to the parent process to keep it informed of the current status of the process. The multiprocessing Queue seems perfect for this but I can’t figure out how to get it work. So, this