求c++多线程例子

[Ronal_Lee]

如题

但不要MFC什么的，只要普通的C++程序，必须有类和线程结合使用。

我是初学多线程，希望给个例子学一学。

多谢

[星羽]

#include "process.h"
#include "iostream"
#include "string"
#include "windows.h"
using namespace std;

template<typename devtype>
class thread_base {
public :
    void start() {
        _beginthread(devtype::action, 0, (void*)this);
    }
};

class thread_foo : public thread_base<thread_foo> {
public :
    static void action(void* param) {
        thread_foo* p = reinterpret_cast<thread_foo*>(param);
        for (int i = 0; i < 100; ++i)
        {
            printf("%s\n", p->name.c_str());
            Sleep(10);
        }
    }

public :
    thread_foo() : name("thread foo") {
    }
    string name;
};

class thread_bar : public thread_base<thread_foo> {
public :
    static void action(void* param) {
        thread_foo* p = reinterpret_cast<thread_foo*>(param);
        for (int i = 0; i < 100; ++i)
        {
            printf("%s\n", p->name.c_str());
            Sleep(10);
        }
    }

public :
    thread_bar() : name("thread bar") {
    }
    string name;
};

int main()
{
    thread_foo t1;
    thread_bar t2;
    
    t1.start();
    t2.start();

    for (int i = 0; i < 100; ++i)
    {
        printf("main\n");
        Sleep(10);
    }

    return 0;
}

[野男孩]

_beginthread是不建议使用的，应该用_beginthreadex。

#include <process.h>
#include <windows.h>
#include <iostream>
using namespace std;

class CThread
{
public:
	CThread()
	{
		m_hThread = NULL;
	}

	virtual ~CThread()
	{
		if (m_hThread != NULL)
		{
			Stop();
			CloseHandle(m_hThread);
		}
	}

	//线程启动函数
	BOOL Start()
	{
		m_hThread = (HANDLE)_beginthreadex(NULL, 0, Thread, this, 0, NULL);
		if (m_hThread != NULL)
			return TRUE;
		return FALSE;
	}
	
	//线程强行结束
	void Stop()
	{
		TerminateThread(m_hThread, 0);
		CloseHandle(m_hThread);
	}

	//等待线程结束，参数nTime:等待时间，单位毫秒
	BOOL Wait(int nTime = INFINITE)
	{
		if (WaitForSingleObject(m_hThread, nTime) == WAIT_OBJECT_0)
		{
			return TRUE;
		}
		return FALSE;
	}

	//挂起线程
	BOOL Suspend()
	{
		if (m_hThread != NULL)
			return SuspendThread(m_hThread);
		return FALSE;
	}

	//恢复挂起的线程
    BOOL Resume()
	{
		if (m_hThread != NULL)
			return ResumeThread(m_hThread);
		return FALSE;
	}

	static UINT WINAPI Thread(LPVOID lpParam)
	{
		CThread* pThread = static_cast<CThread*>(lpParam);
		try
		{
			pThread->Work();
		}
		catch(...)
		{
		}
		return 0;
	}

	//工作函数，用户类覆盖之
	virtual int Work()
	{
		return 0;
	}
private:
	HANDLE m_hThread;
};

class CWorker : public CThread
{
public:
	CWorker(int id)
	{
		m_nID = id;
	}

	int Work()
	{
		int i=0;
		while(i<5)
		{
			cout<<"[Work " << m_nID << "] hi, passed "<< ++i << " second." << endl;
			Sleep(1000);
		}

		cout << "[Work] thread exit!" << endl;
		return 0;
	}

private:
	int m_nID;
};

int main(int argc, char *argv[]) 
{
	CWorker Worker1(1), Worker2(2);

	Worker1.Start();	//启动线程
	Sleep(700); 
	Worker2.Start();

	//等待线程结束
	while(!Worker1.Wait(1300) || !Worker2.Wait(1300))
	{
		cout << "[main] Wait thread end..." << endl;
	}

	cout << "[main] bye bye~" <<endl;

    return 0;
}

仓促写的，cout输出没有加同步，时间长的话可能输出会混乱。凑合看吧~

[Chappell]

You can call _endthread or _endthreadex explicitly to terminate a thread; however, _endthread or _endthreadex is called automatically when the thread returns from the routine passed as a parameter. Terminating a thread with a call to endthread or _endthreadex helps to ensure proper recovery of resources allocated for the thread.

中止线程最好不要用TerminateThread

[Ronal_Lee]

[Quote=引用 3 楼 Chappell 的回复:]
C/C++ code
You can call _endthread or _endthreadex explicitly to terminate a thread; however, _endthread or _endthreadex is called automatically when the thread returns from the routine passed as a parameter. Terminating a thread with a call to endthread or _endthreadex helps to ensure proper recovery of resources allocated for the thread.

中止线程最好不要用TerminateThread
[/Quote]

有没有什么好书介绍一下哈

[beyondtkl]

Windows核心编程。。

[Ronal_Lee]

[Quote=引用 2 楼 coding_hello 的回复:]
_beginthread是不建议使用的，应该用_beginthreadex。


C/C++ code
#include <process.h>
#include <windows.h>
#include <iostream>
using namespace std;

class CThread
{
public:
CThread()
{
m_hThread = NULL;

virtual ~CThread()
{
if (m_hThread != NULL)
{
Stop();
CloseHandle(m_hThread);
}
}

…
[/Quote]

用2003.net 编译出错了，“ error C3861: '_beginthreadex': identifier not found, even with argument-dependent lookup”

是不是少什么头文件？

[Ronal_Lee]

[Quote=引用 2 楼 coding_hello 的回复:]
_beginthread是不建议使用的，应该用_beginthreadex。


C/C++ code
#include <process.h>
#include <windows.h>
#include <iostream>
using namespace std;

class CThread
{
public:
CThread()
{
m_hThread = NULL;
}

virtual ~CThread()
{
if (m_hThread != NULL)
{
Stop();
CloseHandle(m_hThread);
}
}

…
[/Quote]

int Work()
{
int i=0;
while(i<5)
{
WaitForSingleObject(muxtex, INFINITE);//###########
cout<<"[Work " << m_nID << "] hi, passed "<< ++i << " second." << endl;
Sleep(1000);
ReleaseMutex(muxtex);//#################
}

cout << "[Work] thread exit!" << endl;
return 0;
}


我在Work函数中加入了等待互斥锁的语句，然后就不能输出work函数里的语句了，只能输出“[main] Wait thread end...”，为什么呢？

[Chappell]

_beginthreadex头文件是<process.h>
同时要设置环境，连接到多线程库

[Ronal_Lee]

[Quote=引用 8 楼 Chappell 的回复:]
_beginthreadex头文件是 <process.h>
同时要设置环境，连接到多线程库
[/Quote]

谢谢，解决了。能不能帮我解答7楼的那个问题？？谢谢

[大爷想要时光机]

可以看看c＋＋的多线程库，如：ZThread

[大爷想要时光机]

那个库是跨平台的