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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
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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

Solutions to starvation


Through an analysis of different approaches to the readers-writers problem, you have seen the key to solving starvation: since some threads will be starved if they are not given a high priority in accessing the shared resources, implementing fairness in the execution of all of the threads will prevent starvation from occurring. Fairness, in this case, does not require a program to forgo any order or priority that it has imposed on the different threads; but to implement fairness, a program needs to ensure that all threads are given sufficient opportunities to execute their instructions.

Keeping this idea in mind, we can potentially address the problem of starvation by implementing one (or a combination) of the following approaches:

  • Increasing the priority of low-priority threads: As we did with the writer threads in the second approach and the reader threads in the third approach to the readers-writers problem, prioritizing the threads that would otherwise not have...
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