MsgWaitForMultipleObjects用法

最新推荐文章于 2023-02-16 15:22:06 发布

原创最新推荐文章于 2023-02-16 15:22:06 发布 · 2k 阅读

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#object #多线程 #null

本文介绍在Win32多线程环境下如何正确使用MsgWaitForMultipleObjects函数。为了保证handles数组的连续性，在某个handle被激发后需要重新整理数组，避免出现空隙。同时，文章提供了具体的实现代码示例。

MsgWaitForMultipleObjects()不允许handles数组中有缝隙产生。所以当某个handle被激发了时，你应该在下一次调用MsgWaitForMultipleObjects()之前先把handles数组做个整理。紧压，不要只是把数组中的handle设为NULL.quit = FALSE; while (!quit || gNumPrinting > 0) { // Wait for next message or object being signaled DWORD dwWake; dwWake = MsgWaitForMultipleObjects( gNumPrinting, gPrintJobs, FALSE, INFINITE, QS_ALLEVENTS); if (dwWake >= WAIT_OBJECT_0 && dwWake < WAIT_OBJECT_0 + gNumPrinting) { // Object has been signaled // Reorder the handle array so we do not leave // empty slots. Take the handle at the end of // the array and move it into the now-empty slot. int index = dwWake - WAIT_OBJECT_0; gPrintJobs[index] = gPrintJobs[gNumPrinting-1]; gPrintJobs[gNumPrinting-1] = 0; gNumPrinting--; SendMessage(hDlgMain, WM_THREADCOUNT, gNumPrinting, 0L); } // end if else if (dwWake == WAIT_OBJECT_0 + gNumPrinting) { while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) { // Get Next message in queue if(hDlgMain == NULL || !IsDialogMessage(hDlgMain,&msg)) { if (msg.message == WM_QUIT) { quit = TRUE; exitCode = msg.wParam; break; } // end if TranslateMessage(&msg); DispatchMessage(&msg); } } // end while } } // end whi

这个是在WIN32多线程看到的，记录下。