实验: 线程操作细节的验证

// NonMfcThreadTest1.cpp : Defines the entry point for the console application.//#include "stdafx.h"#include <windows.h>#include <process.h>void fnThread(void * pPara);/*** @note 线程函数一定是要入参的* 线程函数没有入参指针时的编译错误* error C2664: '_beginthread' : cannot convert parameter 1 from 'void (void)' * to 'void (__cdecl *)(void *)'*///void fnThread();int main(int argc, char* argv[]){Beep(100, 200);printf("Hello World!/n");/*** 要使用线程函数 _beginthread, 需要打开下面选项:* Project>>Settings>>c/c++>>Use run-time libray>> Multithreaded DLL* 如果IDE设置是Single-Threaded*, 有编译错误* error C2065: '_beginthread' : undeclared identifier*/_beginthread(fnThread, 0, NULL);MessageBox(NULL, "<< Main", "", IDOK);return 0;}void fnThread(void * pPara){while(1){Beep(100, 200);Sleep(200);DeleteFile("c://tmp//test.txt");//c://tmp//test.txt, 手工建立这个文件,//如果被删掉, 说明线程还在运行}/*** 通过Beep和手工拷贝临时文件的结果, 得出结论* 当主线程退出时, 线程被强行进程结束掉了, * 线程开辟的资源得不到释放* 不可能达到主程序退出时, 留下一个工作线程在干活的效果*/MessageBox(NULL, "fnThread Quit", "", IDOK);}

<2011_0324>

/*****************************************************************************/<2011_0324_0013><home><LostSpeed><Threadwrapper V1.0.0.1>* Threadwrapper 封装了一个线程基类, 控制线程的建立, 运行, 暂停, 继续, 停止 提供了线程实现为虚函数, 使用户专注于线程逻辑的实现./*****************************************************************************/

// SrcThreadwrapper.cpp : Defines the entry point for the console application.//#include "stdafx.h"#include "SrcThreadwrapper.h"#include "ThreadwrapperApp1.h"#ifdef _DEBUG#define new DEBUG_NEW#undef THIS_FILEstatic char THIS_FILE[] = __FILE__;#endif/////////////////////////////////////////////////////////////////////////////// The one and only application objectCWinApp theApp;using namespace std;int fnTestMyThread();int _tmain(int argc, TCHAR* argv[], TCHAR* envp[]){int nRetCode = 0;// initialize MFC and print and error on failureif (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0)){// TODO: change error code to suit your needscerr << _T("Fatal Error: MFC initialization failed") << endl;nRetCode = 1;}else{// TODO: code your application's behavior here.CString strHello;strHello.LoadString(IDS_HELLO);cout << (LPCTSTR)strHello << endl;fnTestMyThread();}printf("END");getchar();return nRetCode;}int fnTestMyThread(){/*** test CThreadwrapperApp1, ours thread from CThreadwrapperBase*/int nSleepCnt = 3000;CThreadwrapperApp1 ThreadwrapperApp1;Sleep(nSleepCnt);ThreadwrapperApp1.CreateThreadProc();Sleep(nSleepCnt);ThreadwrapperApp1.RunThreadProc();Sleep(nSleepCnt);ThreadwrapperApp1.PauseThreadProc();Sleep(nSleepCnt);ThreadwrapperApp1.ContinueThreadProc();Sleep(nSleepCnt);ThreadwrapperApp1.StopThreadProc();Sleep(nSleepCnt);return S_OK;}

// ThreadwrapperApp1.h: interface for the CThreadwrapperApp1 class.////////////////////////////////////////////////////////////////////////#if !defined(AFX_THREADWRAPPERAPP1_H__78952616_8587_46EB_9735_0DD38A4A2042__INCLUDED_)#define AFX_THREADWRAPPERAPP1_H__78952616_8587_46EB_9735_0DD38A4A2042__INCLUDED_#if _MSC_VER > 1000#pragma once#endif // _MSC_VER > 1000#include "ThreadwrapperBase.h"class CThreadwrapperApp1 : public CThreadwrapperBase {public:CThreadwrapperApp1();virtual ~CThreadwrapperApp1();virtual UINT ThreadProc(void);int dosomething(int nStepSn);BOOL m_bTaskWasFinished;};#endif // !defined(AFX_THREADWRAPPERAPP1_H__78952616_8587_46EB_9735_0DD38A4A2042__INCLUDED_)

// ThreadwrapperApp1.cpp: implementation of the CThreadwrapperApp1 class.////////////////////////////////////////////////////////////////////////#include "stdafx.h"#include "SrcThreadwrapper.h"#include "ThreadwrapperApp1.h"#ifdef _DEBUG#undef THIS_FILEstatic char THIS_FILE[]=__FILE__;#define new DEBUG_NEW#endif//////////////////////////////////////////////////////////////////////// Construction/Destruction//////////////////////////////////////////////////////////////////////CThreadwrapperApp1::CThreadwrapperApp1(){m_bTaskWasFinished = FALSE;}CThreadwrapperApp1::~CThreadwrapperApp1(){}UINT CThreadwrapperApp1::ThreadProc(void){/*** 继承自这个线程控制类的类实现虚函数ThreadProc完成自己的线程逻辑* 写法参照下面的示例*//*** 任务如果没有完成, 检测是否需要退出* 如果需要退出, 则退出, 使线程响应迅速*/int nStepSn = 0;while(S_OK != IsNeedStop()){printf(">> CThreadwrapperApp1::ThreadProc running.../n");Sleep(10);/**< 留出时间片给系统, 避免CPU占用率过高 *//*** 任务如果完成, 可以主动退出** 没有接到调用者的停止命令, 继续任务** 为了使线程响应迅速, 应该减少dosomething()的执行时间* 或者把一个大任务分解成许多的小任务*/if(m_bTaskWasFinished)break;elsedosomething(nStepSn++);}return S_OK;}int CThreadwrapperApp1::dosomething(int nStepSn){int n = 0;if(nStepSn > 20){m_bTaskWasFinished = TRUE;}printf(">> process Setp[%d]/n", nStepSn);Sleep(n * 100);printf("<< process Setp[%d]/n", nStepSn);return S_OK;}

// ThreadwrapperBase.h: interface for the CThreadwrapperBase class.////////////////////////////////////////////////////////////////////////#if !defined(AFX_THREADWRAPPERBASE_H__CE04C904_61E6_4453_9AC8_C514E131A06E__INCLUDED_)#define AFX_THREADWRAPPERBASE_H__CE04C904_61E6_4453_9AC8_C514E131A06E__INCLUDED_#if _MSC_VER > 1000#pragma once#endif // _MSC_VER > 1000class CThreadwrapperBase {public:CThreadwrapperBase();virtual ~CThreadwrapperBase();public:INT CreateThreadProc();INT RunThreadProc();INT PauseThreadProc();INT ContinueThreadProc();INT StopThreadProc();INT IsNeedStop();INT IsThreadWasStoped();private:static UINT ThreadProc(LPVOID lpArg);virtual UINT ThreadProc(void);private:CWinThread * m_pWinThread;HANDLE m_hEvent_ThreadProc_NeedStop;DWORD m_dwThreadCnt;};#endif // !defined(AFX_THREADWRAPPERBASE_H__CE04C904_61E6_4453_9AC8_C514E131A06E__INCLUDED_)

// ThreadwrapperBase.cpp: implementation of the CThreadwrapperBase class.////////////////////////////////////////////////////////////////////////#include "stdafx.h"#include "SrcThreadwrapper.h"#include "ThreadwrapperBase.h"#ifdef _DEBUG#undef THIS_FILEstatic char THIS_FILE[]=__FILE__;#define new DEBUG_NEW#endif//////////////////////////////////////////////////////////////////////// Construction/Destruction//////////////////////////////////////////////////////////////////////CThreadwrapperBase::CThreadwrapperBase(){m_dwThreadCnt = 0;m_pWinThread = NULL;m_hEvent_ThreadProc_NeedStop = CreateEvent(NULL, TRUE, FALSE, NULL);}CThreadwrapperBase::~CThreadwrapperBase(){if(S_OK != IsThreadWasStoped()){StopThreadProc();}}INT CThreadwrapperBase::IsNeedStop(){return (WAIT_OBJECT_0 == WaitForSingleObject(m_hEvent_ThreadProc_NeedStop, 1))? S_OK : S_FALSE;}INT CThreadwrapperBase::IsThreadWasStoped(){if(!m_pWinThread)return S_OK;/**< Thread never run */return (WAIT_OBJECT_0 == WaitForSingleObject(m_pWinThread->m_hThread, 1))? S_OK : S_FALSE;}INT CThreadwrapperBase::CreateThreadProc(){printf(">> CThreadwrapperBase::CreateThreadProc()/n");if(m_pWinThread && (S_OK != IsThreadWasStoped()))return S_OK;/**< thread running or pause *//*** thread never run or thread finished by itself*/ResetEvent(m_hEvent_ThreadProc_NeedStop);m_pWinThread = AfxBeginThread(ThreadProc, this, THREAD_PRIORITY_NORMAL, 0, CREATE_SUSPENDED, NULL);ASSERT(m_pWinThread);m_pWinThread->m_bAutoDelete = FALSE;/**< important! */return S_OK;}INT CThreadwrapperBase::RunThreadProc(){printf(">> CThreadwrapperBase::RunThreadProc()/n");INT nRc = 0;if(m_pWinThread){ContinueThreadProc();//nRc = m_pWinThread->Run();}elsereturn S_FALSE;return S_OK;}INT CThreadwrapperBase::PauseThreadProc(){printf(">> CThreadwrapperBase::PauseThreadProc()/n");if(!m_pWinThread)return S_FALSE;/*** msdn say:* Increments the current thread’s suspend count. * If any thread has a suspend count above zero, that thread does not execute.*/m_dwThreadCnt = m_pWinThread->SuspendThread();return (m_dwThreadCnt > 0) ? S_OK : S_FALSE;}INT CThreadwrapperBase::ContinueThreadProc(){printf(">> CThreadwrapperBase::ContinueThreadProc()/n");if(!m_pWinThread)return S_FALSE;m_dwThreadCnt = m_pWinThread->ResumeThread();/*** msdn say:* If the return value is one, the thread was suspended, but is now restarted. * Any return value greater than one means the thread remains suspended.*/return (1 == m_dwThreadCnt) ? S_OK : S_FALSE;}INT CThreadwrapperBase::StopThreadProc(){printf(">> CThreadwrapperBase::StopThreadProc()/n");if(!m_pWinThread)return S_OK;SetEvent(m_hEvent_ThreadProc_NeedStop);WaitForSingleObject(m_pWinThread->m_hThread, INFINITE);delete m_pWinThread;m_pWinThread = NULL;return S_OK;}UINT CThreadwrapperBase::ThreadProc(LPVOID lpArg){if(!lpArg)return S_FALSE;CThreadwrapperBase * pThis = (CThreadwrapperBase *)(lpArg);return pThis->ThreadProc();}UINT CThreadwrapperBase::ThreadProc(void){/*** 继承自这个线程控制类的类实现虚函数ThreadProc完成自己的线程逻辑* 写法参照下面的示例*//*** 任务如果没有完成, 检测是否需要退出* 如果需要退出, 则退出, 使线程响应迅速*/while(S_OK != IsNeedStop()){printf(">> CThreadwrapperBase::ThreadProc running/n");Sleep(10);/**< 留出时间片给系统, 避免CPU占用率过高 *//*** 任务如果完成, 可以主动退出** 没有接到调用者的停止命令, 继续任务** 为了使线程响应迅速, 应该减少dosomething()的执行时间* 或者把一个大任务分解成许多的小任务*///下面是伪码//if(bTaskWasFinished)//break;//else//dosomething();}return S_OK;}