[MFC]同步对象——CCriticalSection临界区，CSemaphore信号量

实例——CCriticalSection临界区

头文件关键代码：

// MFCCriticalSectionDlg.h : 头文件 
#pragma once
#define  WM_MSG WM_USER+1
typedef struct THREAD_PARAM
{
	HWND hWnd;
	int nData;
	CCriticalSection* pCriticalSection;
}_THREAD_PARAM;
UINT ThreadFun1(LPVOID pParam);
UINT ThreadFun2(LPVOID pParam);

cpp文件关键代码：

//MFCCriticalSectionDlg.cpp : 实现文件
CMFCCriticalSectionDlg::CMFCCriticalSectionDlg(CWnd* pParent /*=NULL*/)
	: CDialogEx(CMFCCriticalSectionDlg::IDD, pParent)
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
	//成员变量
	//	CWinThread* pThread1;
	// 	CWinThread* pThread2;
	// 	THREAD_PARAM mThreadParam;
	pThread1=NULL;
	pThread2=NULL;
	mThreadParam.hWnd=NULL;
	mThreadParam.nData=0;
	mThreadParam.pCriticalSection=new CCriticalSection;
	//存取或者释放一个CCriticalSection对象，要先建立一个CSiingleLock对象，并调用它的Lock和UnLock成员函数。如果CCriticalSection对象是独占使用的，需要调用它的UnLock成员函数以释放对它的占用。 
}
CMFCCriticalSectionDlg::~CMFCCriticalSectionDlg()
{
	if (pThread1)
	{
		WaitForSingleObject(pThread1->m_hThread,INFINITE);
		delete pThread1;
		pThread1=NULL;
	}
	if (pThread2)
	{
		WaitForSingleObject(pThread2->m_hThread,INFINITE);
		delete pThread2;
		pThread2=NULL;
	}
	if (mThreadParam.pCriticalSection)
	{
		delete mThreadParam.pCriticalSection;
		mThreadParam.pCriticalSection=NULL;
	}
}
//WM_MSG消息函数
LRESULT CMFCCriticalSectionDlg::OnMsgFun(WPARAM wParam,LPARAM lParam)
{
	SetDlgItemInt(IDC_EDIT_DATA,mThreadParam.nData);
	return 0;
}
//启动线程按钮事件
void CMFCCriticalSectionDlg::OnBnClickedButtonStart()
{ 
	if (pThread1)
	{
		DWORD exitCode=0;
		if (::GetExitCodeThread(pThread1->m_hThread,&exitCode))
		{
			if (exitCode == STILL_ACTIVE)
			{
				AfxMessageBox(_T("线程1已经启动。"));
				return;
			}
			else
			{
				delete pThread1;
				pThread1=NULL;
			}
		}
	}
	if (pThread2)
	{
		DWORD exitCode=0;
		if (::GetExitCodeThread(pThread2->m_hThread,&exitCode))
		{
			if (exitCode == STILL_ACTIVE)
			{
				AfxMessageBox(_T("线程2已经启动。"));
				return;
			}
			else
			{
				delete pThread2;
				pThread2=NULL;
			}
		}
	}
	mThreadParam.hWnd=m_hWnd;
	pThread1=AfxBeginThread(ThreadFun1,&mThreadParam,THREAD_PRIORITY_ABOVE_NORMAL,0,CREATE_SUSPENDED); 
	pThread2=AfxBeginThread(ThreadFun2,&mThreadParam,THREAD_PRIORITY_ABOVE_NORMAL,0,CREATE_SUSPENDED);  
	pThread1->m_bAutoDelete=FALSE;
	pThread2->m_bAutoDelete=FALSE;
	pThread1->ResumeThread();
	pThread2->ResumeThread();
}
//线程函数1
UINT ThreadFun1(LPVOID pParam)
{
	THREAD_PARAM* pThreadParam=(THREAD_PARAM*)pParam;
	pThreadParam->pCriticalSection->Lock();
	for (int i=0;i<10;i++)
	{
		pThreadParam->nData++;
		::PostMessage(pThreadParam->hWnd,WM_MSG,0,0);
		Sleep(200);
	}
	pThreadParam->pCriticalSection->Unlock();
	return 0;
}
//线程函数2
UINT ThreadFun2(LPVOID pParam)
{
	THREAD_PARAM* pThreadParam=(THREAD_PARAM*)pParam;
	pThreadParam->pCriticalSection->Lock();
	for (int i=0;i<10;i++)
	{
		pThreadParam->nData--;
		::PostMessage(pThreadParam->hWnd,WM_MSG,0,0);
		Sleep(200);
	}
	pThreadParam->pCriticalSection->Unlock();
	return 0;
}

结果图：

实例——CSemaphore信号量

头文件关键代码：

// MFCSemaphoreDlg.h : 头文件 
#pragma once
#define  WM_MSG WM_USER+1
typedef struct THREAD_PARAM
{
	HWND hWnd;
	int nData;
	CSemaphore* pSemaphore;
}_THREAD_PARAM;
UINT ThreadFun(LPVOID pParam);

cpp文件关键代码：

// MFCSemaphoreDlg.cpp : 实现文件
CMFCSemaphoreDlg::CMFCSemaphoreDlg(CWnd* pParent /*=NULL*/)
	: CDialogEx(CMFCSemaphoreDlg::IDD, pParent)
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
	//成员变量
	//THREAD_PARAM mThreadParam;
	//CObArray mThreadArray;
	mThreadParam.nData=0;
	mThreadParam.pSemaphore=new CSemaphore(2,2);//连续单击多次只会增加20次，若：CSemaphore(1,2)连续单击多次增加10次
	/*
	CSemaphore( LONG lInitialCount = 1,
	LONG lMaxCount = 1,
	LPCTSTR pstrName= NULL,
	LPSECURITY_ATTRIBUTES lpsaAttributes = NULL);
	参数： lInitialCount 信号的初始使用计数。必须是大于或等于0，并且小于或等于lMaxCount。  
	           lMaxCount 信号的使用计数的最大值。必须大于0。  
	           pstrName 信号的名字。 
	           lpsaAttributes 此信号对象的安全标志。有关这个结构的详细描述，参见“Win32 SDK程序员参考”中的SECURITY_ATTRIBUTES。  
	说明： 此成员函数用来构造一个有名字或没有名字的CSemaphore对象。要访问或释放一个CSemaphore对象，可以创建一个CMultiLock或CSingleLock对象，并调用它们的Lock和Unlock函数。
	*/
}
CMFCSemaphoreDlg::~CMFCSemaphoreDlg()
{
	int count=mThreadArray.GetCount();
	for (int i=0;i<mThreadArray.GetCount();i++)
	{
		CWinThread* pThread=(CWinThread*)mThreadArray.GetAt(i);
		if (pThread)
		{
			::WaitForSingleObject(pThread->m_hThread,INFINITE);//等待线程结束
			delete pThread;
			pThread=NULL;
		}
	}
	mThreadArray.RemoveAll();
	if (mThreadParam.pSemaphore)
	{
		delete mThreadParam.pSemaphore;
		mThreadParam.pSemaphore=NULL;
	}
}
//WM_MSG消息函数
LRESULT CMFCSemaphoreDlg::OnMsgFun(WPARAM wParam,LPARAM lParam)
{
	SetDlgItemInt(IDC_EDIT_DATA,mThreadParam.nData);
	return 0;
}
//启动线程按钮事件
void CMFCSemaphoreDlg::OnBnClickedButtonStart()
{ 
	mThreadParam.hWnd=m_hWnd;
	CWinThread* pThread=AfxBeginThread(ThreadFun,&mThreadParam,THREAD_PRIORITY_ABOVE_NORMAL,0,CREATE_SUSPENDED);//启动线程，初始为挂起状态  pthread 0x006ecd68 pro 0x01253700
	mThreadArray.Add((CObject*)pThread);//将线程指针添加到数组中
	pThread->m_bAutoDelete=FALSE;//线程结束时不自动删除 mdata 0x006e6860
	pThread->ResumeThread();//恢复线程运行
}
//线程函数
UINT ThreadFun(LPVOID pParam)
{
	THREAD_PARAM* pThreadParam=(THREAD_PARAM*)pParam;	 
	CSingleLock singleLock(pThreadParam->pSemaphore);
	singleLock.Lock(0);//锁定
	if (singleLock.IsLocked())
	{
		for (int i=0;i<10;i++)
		{
			pThreadParam->nData++;
			PostMessage(pThreadParam->hWnd,WM_MSG,0,0);
			Sleep(100);
		}
	} 
	singleLock.Unlock();//解锁
	return 0;
}

结果图：