Keyboard interruptable blocking queue in Python

Published: 26 September 2023
on channel: CodeGPT

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title: building an interruptable blocking queue in python
introduction:
a keyboard interruptable blocking queue in python is a useful data structure that allows you to enqueue and dequeue items while also allowing for keyboard interrupts (usually triggered by pressing ctrl+c) to gracefully exit the queue operations. this tutorial will guide you through the process of creating a simple interruptable blocking queue with python's threading module.
requirements:
to follow this tutorial, you'll need:
code example:
explanation:
we start by importing the necessary modules: queue, threading, signal, and sys.
we define the keyboardinterruptableblockingqueue class, which wraps a standard queue.queue to provide a queue that can be interrupted by a keyboard interrupt.
the enqueue and dequeue methods are used to add and remove items from the queue.
the stop method is used to signal the consumer thread to exit gracefully by placing a none item in the queue.
we define a signal_handler function that handles the keyboardinterrupt (ctrl+c) signal and sets the interrupted flag to true.
in the producer function, we simulate producing items and adding them to the queue with a simulated delay.
in the consumer function, we continuously dequeue items from the queue until the interrupted flag becomes true or a none item is encountered, indicating that it's time to exit.
inside the if _name_ == "__main__": block, we set up the signal handler and create instances of keyboardinterruptableblockingqueue, producer_thread, and consumer_thread.
we start the producer and consumer threads and wait for them to finish.
when both threads finish, we print a message indicating that all threads have finished.
now, you have a keyboard interruptable blocking queue that allows you to gracefully handle ctrl+c interruptions while enqueuing and dequeuing items in python.
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