线程池QueueUserWorkItem

最新推荐文章于 2024-03-22 08:32:34 发布

Augusdi

最新推荐文章于 2024-03-22 08:32:34 发布

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分类专栏： VC++程序设计文章标签： attributes winapi semaphore security null access

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本文通过一个具体的示例介绍了如何使用Windows线程池API来调度任务，并利用信号量和临界区进行线程间的同步。示例中创建了一个可等待的信号量用于控制主线程的阻塞，同时通过QueueUserWorkItem函数将任务加入到线程池中执行。

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// Test1.cpp : Defines the entry point for the console application. // #include "stdafx.h" #include <assert.h> #include <Windows.h> DWORD WINAPI TestThreadPool(PVOID pContext); CRITICAL_SECTION g_cs; int _tmain(int argc, _TCHAR* argv[]) { InitializeCriticalSection(&g_cs); SECURITY_ATTRIBUTES sa; sa.bInheritHandle = TRUE; sa.nLength = sizeof(SECURITY_ATTRIBUTES); sa.lpSecurityDescriptor = NULL; HANDLE hSemaphore = CreateSemaphoreW(&sa, 0 ,1, L"jyytet"); for (int i = 0; i < 10; i++) { QueueUserWorkItem(TestThreadPool, L"Hello World", WT_EXECUTEDEFAULT); } QueueUserWorkItem(TestThreadPool, L"Finish", WT_EXECUTEDEFAULT); WaitForSingleObject(hSemaphore, -1); CloseHandle(hSemaphore); hSemaphore = NULL; DeleteCriticalSection(&g_cs); wprintf(L"Game over /r/n"); getchar(); return 0; } DWORD WINAPI TestThreadPool(PVOID pContext) { if (NULL == pContext) return 0; EnterCriticalSection(&g_cs); wchar_t *pPrintf = (wchar_t *) pContext; wprintf(L"%s /r/n", pPrintf); Sleep(1000); if (wcscmp(pPrintf, L"Finish") == 0) { HANDLE hSemaphore = OpenSemaphoreW(SEMAPHORE_ALL_ACCESS, FALSE, L"jyytet"); assert(hSemaphore != NULL); ReleaseSemaphore(hSemaphore, 1, NULL); CloseHandle(hSemaphore); } LeaveCriticalSection(&g_cs); return 1; }