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The ABCs of thread safety

The ABCs of thread safety. 郑宜霖. 0 thread. 0.0 what are threads. 0.1 why threads. 1 thread “unsafety”. 1.0 Race condition. 1.1 CASE I: read-increase-write. 1.2 CASE II: Removing a Node. 2 Mutex. 2.0 Mutual Exclusion. 2.1 Increment-Mutex. 2.2 Sounds good?. Hardware I nterrupt Signal.

ezekiel-acevedo
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The ABCs of thread safety

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  1. The ABCs of thread safety 郑宜霖

  2. 0 thread

  3. 0.0 what are threads

  4. 0.1 why threads

  5. 1 thread “unsafety”

  6. 1.0 Race condition

  7. 1.1 CASE I: read-increase-write

  8. 1.2 CASE II: Removing a Node

  9. 2 Mutex

  10. 2.0 Mutual Exclusion

  11. 2.1 Increment-Mutex

  12. 2.2 Sounds good? • Hardware Interrupt • Signal

  13. 2.3 Reentrancy Lock the Mutex Call increment() Interrupt Some Operations Unable to Lock Unlock the Mutex

  14. 3 Atomic Operation

  15. 3.0 Atomic Operations

  16. 3.1 Increment-Atomic

  17. 3.2 std::atomic

  18. 3.3 How Do They Do it? • Hardware Support for Atomic Operations (adding, incrementing, subtracting, etc.) • Support for CAS (hardware / software)

  19. 3.4 Compare-and-swap

  20. 3.5 Increment-CAS

  21. 3.6 What’s More • Only CAS with 1, 2 ,4 ,8 Bytes • How to implement an atomic class?

  22. References • GStreamer Application Development Manual • Wikipedia • Cppreference • GCC Wiki

  23. Thanks

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