How do I use a queue in multithreading?

How do I use a queue in multithreading?

You can use the Queue class from the queue module in Python. It helps manage tasks between threads.

Can you show me a simple example?

Sure! Here's a basic example:

import threading
import queue

# Create a queue
q = queue.Queue()

# Worker function
def worker():
    while True:
        item = q.get()
        if item is None:
            break
        print(f'Processing {item}')
        q.task_done()

# Start worker threads
threads = []
for i in range(4):
    t = threading.Thread(target=worker)
    t.start()
    threads.append(t)

# Add items to the queue
for item in range(10):
    q.put(item)

# Block until all tasks are done
q.join()

# Stop workers
for i in range(4):
    q.put(None)
for t in threads:
    t.join()

What does q.join() do?

q.join() blocks until all items in the queue have been processed. It ensures that all tasks are completed before moving on.

Are there any performance considerations I should be aware of?

Yes, using a queue can introduce some overhead. It's important to balance the number of threads and the workload to optimize performance.