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Concurrency with Modern C++

You're reading from   Concurrency with Modern C++ What every professional C++ programmer should know about concurrency.

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Product type Paperback
Published in Dec 2019
Publisher
ISBN-13 9781839211027
Length 543 pages
Edition 1st Edition
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Author (1):
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Rainer Grimm Rainer Grimm
Author Profile Icon Rainer Grimm
Rainer Grimm
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Table of Contents (19) Chapters Close

1. Reader Testimonials FREE CHAPTER
2. Introduction 3. Concurrency with Modern C++ 4. Memory Model 5. Multithreading 6. Parallel Algorithms of the Standard Template Library 7. The Near Future: C++20 8. Case Studies 9. The Future: C++23 10. Patterns and Best Practices 11. Synchronisation Patterns 12. Concurrent Architecture 13. Best Practices 14. Lock-Based Data Structures 15. Challenges 16. The Time Library 17. CppMem - An Overview 18. Glossary 19. Index

Execution Policies

The standard defines three execution policies:

  • std::execution::sequenced_policy
  • std::execution::parallel_policy
  • std::execution::parallel_unsequenced_policy

The corresponding policy tag specifies whether a program should run sequentially, in parallel, or parallel with vectorisation.

  • std::execution::seq: runs the program sequentially
  • std::execution::par: runs the program in parallel on multiple threads
  • std::execution::par_unseq: runs the program in parallel on multiple threads and allows the interleaving of individual loops; permits a vectorised version with SIMD (Single Instruction Multiple Data) extensions.

The usage of the execution policy std::execution::par or std::execution::par_unseq allows the algorithm to run parallel or parallel and vectorised. This policy is a permission and not a requirement.

The following code snippet applies all execution policies.

The execution policy
 1 std::vector<int> v = {1, 2, 3, 4, 5, 6, 7, 8, 9...
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