Multithreading Multi-Threaded Programming

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Do you send the message or post it? } PostMessage is better } The PostMessage function places (posts) a message in the message queue associated with the thread that created the specified window and returns without waiting for the thread to process the message. } SendMessage could cause reentry of the main thread’s MFC message pump code, } Sends the specified message to a window and calls the window procedure for the specified window and does not return until the window procedure has processed the message. 20 BOOL PostMessage( HWND hWnd, // Handle to the window who is to receive the message. UINT Msg, // the message to be posted. WPARAM wParam, // specify data (WORD) or. LPARAM lParam // the location (LONG) of data in the MSG struct. ); ::PostMessage((HWND)pParam, WM_COMPLETE,0,0); Advanced Windows Network <strong>Programming</strong> 11/11/12
What kind Msg in the PostMessage do you post? } Any user-defined message will do. } Assume you defined a private window message called WM_COMPLETE: } Declare user message ID } Declare message handling function in the .h file } Map the message to the handling function in .cpp file } Implement the message handling functon in .cpp file 21 #define WM_COMPLETE (WM_USER + 100) … afx_msg LRESULT OnComplete(WPARAM wParam, LPARAM lParam); DECLARE_MESSAGE_MAP() BEGIN_MESSAGE_MAP(CMYDlg, CDialog) … ON_MESSAGE(WM_COMPLETE,OnComplete) END_MESSAGE_MAP() LRESULT CMyDlg::OnComplete(WPARAM wParam, LPARAM lParam) { ... return 0; } Advanced Windows Network <strong>Programming</strong> 11/11/12
Page 1 and 2: Multithreading Multi-Threaded Progr
Page 3 and 4: Outline } Windows Message Processin
Page 5 and 6: MSG structure } The system sends a
Page 7 and 8: #include #include LRESULT CALLBAC
Page 9 and 10: Yielding Control } What would happe
Page 11 and 12: Writing the Worker Thread Function
Page 13 and 14: Starting the Thread } To start the
Page 15 and 16: The Running Threads } The AfxBeginT
Page 17 and 18: How the Main Thread Talks to a Work
Page 19: How does the worker thread get the
Page 23 and 24: Tips for Parameters of (WPARAM wPar
Page 25 and 26: Using Events for Thread Synchroniza
Page 27 and 28: Win32 Event HANDLE } CreateEvent fu
Page 29 and 30: WaitForSingleObject function } Wait
Page 31 and 32: WaitForMultipleObjects function } W
Page 33 and 34: Example main thread } Start the thr
Page 35 and 36: Timer in worker thread //the while
Page 37 and 38: Synchronization Classes } The multi
Page 39 and 40: When to Use Which? } Synchronizatio
Page 41 and 42: How to determine which is suitable?
Page 43 and 44: Example of using CCriticalSection }
Page 45 and 46: Example of using CMutex } Mutex is
Page 47 and 48: Example of using CSemaphore - 1 } C
Page 49 and 50: Win32 Semaphore Synchronization Obj
Page 51 and 52: Example of Threads Pool - Thread da
Page 53 and 54: Example of Threads Pool - Stop all
Page 55 and 56: Example of Threads Pool -Thread fun
Page 57 and 58: References } Chapter 11,Windows Mes
Page 59 and 60: 59 Advanced Windows Network Program
Page 61: Classes not derived from CObject 61

Multithreading Multi-Threaded Programming

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