实现一个自己的线程类

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windows下创建自己的线程方式有几种。MFC的AfxBeginThread()，win32的CreateThread（但是不推荐，原因可以参考MSDN及《windows核心编程》）。还可以用运行库的_beginthreadex。总之，创建线程的语句也还并不很复杂。

如果每次创建线程都要把那条语句写一遍，那也太笨拙了。同时，如果是在类里用的话，线程函数要定义成静态函数。作为一个懒人，理所应当避免写重复的代码，于是一个自己的线程类就有必要了。

//Thread.h#ifndef LIB_THREAD_CLASS_H#define LIB_THREAD_CLASS_H#pragma once#include "ThreadMutex.h"class CThread{public:CThread(void);virtual ~CThread(void);virtual bool Start(void);virtual void Cancel(void);virtual void Run(void) = 0;virtual bool IsRunning(void);virtual bool SetPriority(int nPriority);virtual DWORD Resume(void);protected:CThread(const CThread &);CThread & operator = (const CThread &);static unsigned _stdcall ThreadFunc(void *pArg);void *m_hThread;unsigned intm_hThreadID;boolm_bCancel;//用于在Run()函数里进行判断CThreadMutexObjectm_mutexThreadCtl;};#endif

//Thread.cpp

#include "Thread.h"#include <process.h>#include <windows.h>#define WAIT_TIME1000CThread::CThread(void):m_hThread(NULL),m_hThreadID(0),m_bCancel(false){}CThread::~CThread(void){}bool CThread::Start(void){CThreadMutex lock(m_mutexThreadCtl);if (NULL != m_hThread){DWORD dwExitCode = 0;if (::GetExitCodeThread(m_hThread, &dwExitCode) == TRUE){if (STILL_ACTIVE == dwExitCode){return false;}}elsereturn false;}m_bCancel = false;m_hThread = (void*)_beginthreadex(NULL,0,&CThread::ThreadFunc,this,0,&m_hThreadID);return true;}void CThread::Cancel(void){if (NULL == m_hThread)return ;CThreadMutex lock(m_mutexThreadCtl);m_bCancel = true;DWORD dw = ::WaitForSingleObject(m_hThread,WAIT_TIME);switch (dw){case WAIT_TIMEOUT:::TerminateThread(m_hThread,1);break;default:;}::CloseHandle(m_hThread);m_hThread = NULL;m_hThreadID = 0;}unsigned __stdcall CThread::ThreadFunc(void * pArg){CThread * pThis = (CThread*)pArg;pThis->Run();_endthreadex(0);return 0;}bool CThread::IsRunning(void){if (NULL == m_hThread)return false;DWORD dwExitCode = 0;::GetExitCodeThread(m_hThread, &dwExitCode);if (STILL_ACTIVE == dwExitCode)return true;return false;}bool CThread::SetPriority(int nPriority){if (NULL == m_hThread)return false;BOOL b = ::SetThreadPriority(m_hThread,nPriority);if (FALSE == b)return false;return true;}DWORD CThread::Resume(void){return ::ResumeThread(m_hThread);}

使用嘛，很简单。定义一个继承自CThread的类，实现它的Run()函数就好了。运行的话执行它的Start()函数就好了。注意，不是执行Run()，如果执行Run()的话也能运行，但是在当前线程里运行，而不是新启动一个线程运行。

写完了，再看看，和JAVA里的线程类很相似啊。英雄所见略同啊；-)

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