Items in the queue are ordered and the queue supports efficient operations for adding items to the end and retrieving items from the front. Let me know in the comments below and I may add it to this section with my answer. This section lists some common questions when using a multiprocessing.Queue in Python. The producer() function below implements this by taking the queue instance as an argument. Once the task is complete it will put the value None on the queue to signal to the consumer that there is no further work. It will then block for that fraction of a second, then put the value on the queue. Each iteration, it will generate a new random value between 0 and 1 via the random.random() function. The task will iterate ten times in a loop. The multiprocessing.Queue provides a way to allow these producer and consumer processes to communicate data with each other.įirst, we can define the function to be executed by the producer process. We will also create a consumer child process that will get numbers from the queue and report their values. In this example, we will create a producer child process that will generate ten random numbers and put them on the queue. We can explore how to use the multiprocessing.Queue class with a worked example. What is the Queue and how can we use it in Python?Ĭonfused by the multiprocessing module API?ĭownload my FREE PDF cheat sheet Example of Using a Queue Python provides a number of process-safe queues, such as the multiprocessing.Queue class. One approach to sharing data is to use a queue data structure. In multiprocessing programming, we often need to share data between processes. Python provides the ability to create and manage new processes via the multiprocessing.Process class. Sometimes we may need to create new child processes in our program in order to execute code concurrently. Both processes and threads are created and managed by the underlying operating system. This process has the name MainProcess and has one thread used to execute the program instructions called the MainThread.
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