code delphi thread safety

Code examples from Delphi Thread Safety Patterns Book

https://dalija.prasnikar.info/delphitspatt/

https://dalija.prasnikar.info

Part 2. The Core Run-Time Library

Chapter 5. Floating-point control register

• BrokenMath.dpr
• BrokenMath.dproj
• SafeMath.dpr
• SafeMath.dproj

Chapter 7.1. Parameters

• Parameters.dpr
• Parameters.dproj
• ParametersMainF.pas
• ParametersMainF.dfm

Chapter 8. Class fields, singletons, and default instances

• Singletons.dpr
• Singletons.dproj
• SingletonsMainF.pas
• SingletonsMainF.dfm
• SingletonClasses.pas
• SingletonLocal.pas
• SingletonClassProp.pas
• SingletonLazy.pas

Chapter 12. Collections

• CollectionsTest.dpr
• CollectionsTest.dproj
• CollectionsMainF.pas
• CollectionsMainF.dfm

Chapter 13. Parallel collection processing

• 13.1 Independent processing of individual collection items

  • ParallelCollections.dpr
  • ParallelCollections.dproj
  • ParallelCollectionsMainF.pas
  • ParallelCollectionsMainF.dfm

• 13.2 Dependent processing of individual collection items

  • DependentParallelCollections.dpr
  • DependentParallelCollections.dproj
  • DependentParallelCollectionsMainF.pas
  • DependentParallelCollectionsMainF.dfm

Part 3. Core Frameworks

Chapter 16. Serialization

• Serialization.dpr
• Serialization.dproj
• SerializationMainF.pas
• SerializationMainF.dfm

Chapter 17. System.Net

• NetClient.dpr
• NetClient.dproj
• NetClientMainF.pas
• NetClientMainF.dfm

Chapter 19. Indy

• Indy.dpr
• Indy.dproj
• IndyMainF.pas
• IndyMainF.dfm

Chapter 20. REST

• RESTDemo.dpr
• RESTDemo.dproj
• RESTMainF.pas
• RESTMainF.dfm

Chapter 21. Regular expressions

• RegEx.dpr

Part 5. Graphics and Image Processing

Chapter 27. Resource consumption

• Resources.dpr
• Resources.dproj
• ResourcesMainF.pas
• ResourcesMainF.dfm

Chapter 30. VCL graphics example

• Images.dpr
• Images.dproj
• ImagesMainF.pas
• ImagesMainF.dfm

Part 6. Custom Frameworks

Chapter 33. Logging

• NX.Log.pas
• Logging.dpr
• Logging.dproj

Chapter 34. Cancellation tokens

• NX.Tokens.pas
• Tokens.dpr
• Tokens.dproj
• TokensMainF.pas
• TokensMainF.dfm

Chapter 35. Event bus

• NX.Horizon.pas
• Horizon.dpr
• Horizon.dproj
• HorizonMainF.pas
• HorizonMainF.dfm

Chapter 36. Measuring performance

• NX.Chronos.pas
• ZeroThread.dpr
• ZeroThread.dproj

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Note: Purpose of the presented examples is to either show thread-unsafe code and issues that may arise in such code, or to show general coding patterns for achieving thread-safe code while multiple threads are running. As such many of them don't implement proper cleanup on application shutdown, and if you close the application before started background tasks or threads completed their job, application may crash.

In order to perform clean shutdown, you either need to wait for task or thread completion or use some other mechanism that will prevent accessing GUI or other shared data during application shutdown.

You can find examples on how to shutdown application in https://github.com/dalijap/code-delphi-async Chapter 35.2 Cleanup on GUI destruction