Queues & Pipes
Explore how to use queues and pipes for process communication in Python's multiprocessing module. Understand different queue types, the use of pipes for sending data between processes, and common synchronization issues. Gain practical skills to handle blocking calls and avoid deadlocks in parallel processing environments.
We'll cover the following...
Queues & Pipes
There are two ways that processes can communicate between themselves:
Queues
Pipes
Queues
The multiprocessing module offers three types of queues which are all FIFO structures based on the queue module's Queue (queue.Queue) implementation in the standard library. These
are:
Simple Queue
Queue
Joinable Queue ( a subclass of Queue)
The queues in the multiprocessing module can be shared among multiple processes. Remember the following:
We can enqueue any element in the queue that is picklable.
Queues are thread and process safe.
If multiple processes enqueue objects at the same time in a queue, the receiver may receive them out of order. However, all the object enqueued by a single process are always received in order.
The official documentation cautions that when an item is placed in an empty queue, there is a "infinitesimal" delay before ...