Multithreading Multi-Threaded Programming

More documents

Recommendations

Info

Other Thread Blocking methods } WaitForSingleObject call is an example of thread blocking. } The thread simply stops executing until an event becomes signaled. } A thread can be blocked in many other ways. } Win32 Sleep function: } Sleep(500); //put your thread to “sleep” for 500 ms. } Many functions block threads, particularly those functions that access hardware devices or Internet hosts. } Windows Socket function: Accept() } You should avoid putting blocking calls in your main user interface thread. } Remember that if your main thread is blocked, it can’t process its messages, and that makes the program appear sluggish. If you have a task that requires heavy file I/O, put the code in a worker thread and synchronize it with your main thread. 34 Advanced Windows Network <strong>Programming</strong> 11/11/12
Timer in worker thread //the while loop will continue sending packets every MT_INTERVAL until the FrameCapture thread signals the g_event_FrameCaptured which means the corresponding response frame has arrived. UINT SendThreadProc( LPVOID pParam ) { pcap_sendpacket( … …); //send a frame out while(::WaitForSingleObject(g_event_FrameCaptured, MT_INTERVAL) != WAIT_OBJECT_0) { pcap_sendpacket( … …); //no response until timeout, so send the frame again, or skip to send the next. ……………… } return 0; } //signal the event when a frame is captured UINT ReceiveThreadProc( LPVOID pParam ) { while(::WaitForSingleObject(g_event_Done,0) != WAIT_OBJECT_0){ res = pcap_next_ex(……); if(res == 0){ continue;} else{ …… g_event_FrameCaptured.SetEvent(); ……. } return 0; } 35 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 and 20: How does the worker thread get the
Page 21 and 22: What kind Msg in the PostMessage do
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: Example main thread } Start the thr
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

Create successful ePaper yourself

Delete template?

Save as template?