线程池将任务push_back到list中的问题

今晚又失眠 2011-06-02 10:30:13

最近在用到线程池，于是在codeproject上找到一个（http://www.codeproject.com/KB/threads/win32threadpool.aspx）

用这个线程池有一个问题，代码如下：

void ThreadPool::AddJobToQueue(

	LPTHREAD_START_ROUTINE pFunc, LPVOID pData, 

	IRunObject* runObject, ThreadPriority priority)

{

	nTime++;

	assert(pFunc != NULL || runObject != NULL);

	JobData jobData;

	jobData.lpStartAddress = pFunc;

	jobData.pData = pData;

	jobData.runObject = runObject;



 

	// add it to the list

	EnterCriticalSection(&m_cs);

	{

		if (priority == Low)			

			m_jobList.push_back(jobData);// 这一行，当所有的线程都busy的时候，将任务加入队列，

		else				// 可是队列中总是保存最后一次的值,而且是push_back几次，

			m_jobList.push_front(jobData);	// 队列中就有几个最后一次的值



#ifdef _DEBUG

		JobList::iterator  it;

		for (it = m_jobList.begin(); it != m_jobList.end(); it++)

		{

			TRACE((char *)it->pData);

			TRACE("\r\n");

		}

#endif

		

		// See if any threads are free



		for (ThreadList::iterator iter = m_threads.begin(); iter != m_threads.end(); ++iter)

		{

			if (WaitForSingleObject(iter->hWait, 0) == WAIT_TIMEOUT)

			{

				// here is a free thread, wake it up

				SetEvent(iter->hWait); 

				break;

			}

		}

	}

	LeaveCriticalSection(&m_cs);



//定义如下

	struct JobData

	{

		LPTHREAD_START_ROUTINE lpStartAddress;

		LPVOID pData;

		IRunObject* runObject;

	};

	typedef std::list<JobData, std::allocator<JobData> > JobList;

         JobList m_jobList;



}