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Advanced Python Programming

You're reading from   Advanced Python Programming Build high performance, concurrent, and multi-threaded apps with Python using proven design patterns

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Product type Course
Published in Feb 2019
Publisher Packt
ISBN-13 9781838551216
Length 672 pages
Edition 1st Edition
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Authors (3):
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Quan Nguyen Quan Nguyen
Author Profile Icon Quan Nguyen
Quan Nguyen
Sakis Kasampalis Sakis Kasampalis
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Sakis Kasampalis
Dr. Gabriele Lanaro Dr. Gabriele Lanaro
Author Profile Icon Dr. Gabriele Lanaro
Dr. Gabriele Lanaro
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Table of Contents (41) Chapters Close

Title Page
Copyright
About Packt
Contributors
Preface
Benchmarking and Profiling Pure Python Optimizations FREE CHAPTER Fast Array Operations with NumPy and Pandas C Performance with Cython Exploring Compilers Implementing Concurrency Parallel Processing Advanced Introduction to Concurrent and Parallel Programming Amdahl's Law Working with Threads in Python Using the with Statement in Threads Concurrent Web Requests Working with Processes in Python Reduction Operators in Processes Concurrent Image Processing Introduction to Asynchronous Programming Implementing Asynchronous Programming in Python Building Communication Channels with asyncio Deadlocks Starvation Race Conditions The Global Interpreter Lock The Factory Pattern The Builder Pattern Other Creational Patterns The Adapter Pattern The Decorator Pattern The Bridge Pattern The Facade Pattern Other Structural Patterns The Chain of Responsibility Pattern The Command Pattern The Observer Pattern 1. Appendix 2. Other Books You May Enjoy Index

The readers-writers problem


The readers-writers problem is one of the classic and most complex examples in the field of computer science, illustrating problems that might occur in a concurrent program. Throughout the analysis of the different variations of the readers-writers problem, we will reveal more about starvation, as well as its common causes. We will also simulate the problem in Python, so that a deeper understanding of the problem can be gained.

Problem statement

In a readers-writers problem, first and foremost, we have a shared resource, which, in most cases, is a text file. Different threads interact with that text file; each is either a reader or a writer. A reader is a thread that simply accesses the shared resource (the text file) and reads in the data included in that file, while a writer is a thread that accesses, and possibly mutates, the contents of the text file.

We know that writers and readers cannot access the shared resources simultaneously since if a thread is writing...

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