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K.TOP 2005

K.TOP 2005. Multi-Thread 2005/1/29. Delphi Win32 API 版僕 SouthWind. Multi-Thread 概述 (1). Time Slice Schedule. Code Execute. Multi-Thread 概述 (2). Process. Global. Heap. Multi-Thread C ommunication. Global 變數. Signal. Message. Multi-Thread 難題. Racing Condition Dead Lock.

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K.TOP 2005

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  1. K.TOP 2005 Multi-Thread 2005/1/29 Delphi Win32 API 版僕 SouthWind

  2. Multi-Thread 概述 (1) Time Slice Schedule Code Execute

  3. Multi-Thread 概述 (2) Process Global Heap

  4. Multi-Thread Communication Global 變數 Signal Message

  5. Multi-Thread 難題 • Racing Condition • Dead Lock

  6. Racing Condition 原因 • Global Resource • 非 Atomic Execute

  7. 避免Racing Condition • Protect Global Resource • Synchronization

  8. Synchronization Technology : • Mutex • Critical Section • Semaphore • Event • Interlocked or Atomic API • Spin Lock • Wait For Object API

  9. Dead Lock 原因 • 設計不良。 • 不可預期的異常發生。

  10. 避免Dead Lock • Time Out 機制 • 清晰的邏輯 • Dead Lock detection

  11. Delphi & Multi-Thread • VCL • Synchronize()

  12. VCL • 絕大多數的 VCL 元件,都是 thread none-safe • 需要自行設計同步機制保護。

  13. Synchronize() • 利用 Message 的技巧,使得 Synchronize() 可以切換至 Main Thread 執行。 • 快速方便的同步機制

  14. Synchronize() 的誤用 • Synchronize() 內執行過長的 Code,造成Thread 效益消失或效率不彰。 • Synchronize() + Wait For Object 系列 API,容易產生 Dead Lock。

  15. Multi-Thread 設計小建議 • 深刻的了解 Multi-Thread 原理與機制。 • 熟悉善用各種同步機制。 • 謹慎使用 Synchronize() ,尤其注意有 Wait For Object 系列 API。 • 分析同步區執行時間的長短,以決定最佳的同步機制。

  16. Win32 API (Multi-Thread) • CreateThread • SuspendThread • ResumeThread • TerminateThread • SetThreadPriority • WaitForSingleObject • WaitForMultipleObjects

  17. Win32 API (Synchronization) • InitializeCriticalSection • EnterCriticalSection • LeaveCriticalSection • DeleteCriticalSection • CreateMutex • ReleaseMutex • CloseHandle

  18. Win32 API (Synchronization) • InterLockedIncrement • InterLockedDecrement • InterLockedExchange • InterLockedExchangeAdd • CreateSemaphore • ReleaseSemaphore • CloseHandle

  19. Delphi & Multi-Thread • TThread Class • TThread.Suspend Method • TThread.Resume Method • TThread.Terminate Method • Synchronize()

  20. Reference • Win32 API 系統程式實例入門 (博碩) • Inside VCL (旗標)

  21. 敬請指教 野人獻曝,若有謬誤,請各位先進不吝指導。

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