C++ 内部类和初始化
我有一个这样定义的类:这个类并不完整,可能无法编译C++ 内部类和初始化,c++,boost-thread,C++,Boost Thread,我有一个这样定义的类:这个类并不完整,可能无法编译 class Server { public: Server(); ~Server(); class Worker { public: Worker(Server& server) : _server(server) { } ~Worker() { } void Run() { } void Stop() { } private: Server& _ser
class Server
{
public:
Server();
~Server();
class Worker
{
public:
Worker(Server& server) : _server(server) { }
~Worker() { }
void Run() { }
void Stop() { }
private:
Server& _server;
}
void Run()
{
while(true) {
// do work
}
}
void Stop()
{
// How do I stop the thread?
}
private:
std::vector<Worker> _workers;
};
我目前正在Server::Run中创建线程
boost::thread_group _threads; // a Server member variable
Server::Run(){
for (int i = 0; i < _thread_count; i++)
_threads.create_thread(boost::bind(&Server::Worker::Run, _workers(i)));
// main thread.
while(1) {
// Do stuff
}
_threads.join_all();
}
boost::thread\u group\u threads;//服务器成员变量
服务器::运行(){
对于(int i=0;i<\u线程数;i++)
_创建线程(boost::bind(&Server::Worker::Run,_workers(i));
//主线程。
而第(1)款{
//做事
}
_线程。连接所有线程();
}
有人认为这有什么问题吗?
安全关机怎么样
编辑:
我发现的一个问题是Worker对象似乎没有被构造!
哎呀。是的,我需要工人类上的复制构造函数
但奇怪的是,创建线程会导致Worker的复制构造函数被多次调用。您有没有看过boost asio?看起来它可能非常适合你正在尝试做的事情。此外,您可以从多个线程调用boost asio的io_服务的run(类似于您的run方法),也就是说,您可以在多个线程中处理io。同样值得关注的是基于asio的线程池
看看asio的例子。也许它们提供了另一种处理您试图做的事情的方法。特别是,看看如何完成干净的关机。我已经用纯WINAPI完成了,看:
#include <stdio.h>
#include <conio.h>
#include <windows.h>
#include <vector>
using namespace std;
class Server
{
public:
class Worker
{
int m_id;
DWORD m_threadId;
HANDLE m_threadHandle;
bool m_active;
friend Server;
public:
Worker (int id)
{
m_id = id;
m_threadId = 0;
m_threadHandle = 0;
m_active = true;
}
static DWORD WINAPI Run (LPVOID lpParam)
{
Worker* p = (Worker*) lpParam; // it's needed because of the static modifier
while (p->m_active)
{
printf ("I'm a thread #%i\n", p->m_id);
Sleep (1000);
}
return 0;
}
void Stop ()
{
m_active = false;
}
};
Server ()
{
m_workers = new vector <Worker*> ();
m_count = 0;
}
~Server ()
{
delete m_workers;
}
void Run ()
{
puts ("Server is run");
}
void Stop ()
{
while (m_count > 0)
RemoveWorker ();
puts ("Server has been stopped");
}
void AddWorker ()
{
HANDLE h;
DWORD threadId;
Worker* n = new Worker (m_count ++);
m_workers->push_back (n);
h = CreateThread (NULL, 0, Worker::Run, (VOID*) n, CREATE_SUSPENDED, &threadId);
n->m_threadHandle = h;
n->m_threadId = threadId;
ResumeThread (h);
}
void RemoveWorker ()
{
HANDLE h;
DWORD threadId;
if (m_count <= 0)
return;
Worker* n = m_workers->at (m_count - 1);
m_workers->pop_back ();
n->Stop ();
TerminateThread (n->m_threadHandle, 0);
m_count --;
delete n;
}
private:
int m_count;
vector <Worker*>* m_workers;
};
int main (void)
{
Server a;
int com = 1;
a.Run ();
while (com)
{
if (kbhit ())
{
switch (getch ())
{
case 27: // escape key code
com = 0;
break;
case 'a': // add worker
a.AddWorker ();
break;
case 'r': // remove worker
a.RemoveWorker ();
break;
}
}
}
a.Stop ();
return 0;
}
#包括
#包括
#包括
#包括
使用名称空间std;
类服务器
{
公众:
班主任
{
国际货币基金组织;
德沃德·穆特莱德;
手柄m_螺纹手柄;
布尔穆活跃;
好友服务器;
公众:
工作人员(内部id)
{
m_id=id;
m_threadId=0;
m_threadHandle=0;
m_active=真;
}
静态DWORD WINAPI运行(LPVOID lpParam)
{
Worker*p=(Worker*)lpParam;//由于使用了静态修饰符,所以需要它
当(p->m_激活时)
{
printf(“我是一个线程#%I\n”,p->m\u id);
睡眠(1000);
}
返回0;
}
无效停止()
{
m_active=false;
}
};
服务器()
{
m_workers=新向量();
m_计数=0;
}
~Server()
{
删除m_工人;
}
无效运行()
{
puts(“服务器正在运行”);
}
无效停止()
{
而(m_计数>0)
解雇工人();
puts(“服务器已停止”);
}
void AddWorker()
{
手柄h;
德沃德·特莱德;
工人*n=新工人(m_计数++);
m_工人->推回(n);
h=CreateThread(NULL,0,Worker::Run,(VOID*)n,CREATE\u SUSPENDED,&threadId);
n->m_threadHandle=h;
n->m_threadId=threadId;
(h);
}
void RemoveWorker()
{
手柄h;
德沃德·特莱德;
if(m_count at(m_count-1);
m_workers->pop_back();
n->Stop();
TerminateThread(n->m_threadHandle,0);
m_count--;
删除n;
}
私人:
国际货币单位计数;
向量*m_工作者;
};
内部主(空)
{
服务器a;
int com=1;
a、 运行();
while(com)
{
if(kbhit())
{
开关(getch())
{
案例27://转义键代码
com=0;
打破
案例“a”://添加工作程序
a、 AddWorker();
打破
案例'r'://删除工作进程
a、 解雇工人();
打破
}
}
}
a、 停止();
返回0;
}
这里没有同步代码,因为我没有足够的时间来做…但我希望它能帮助您=)输入队列来自哪里?您要创建多少工人?我已删除输入队列。我认为这会把事情弄糊涂。我要创建的worker的数量是可变的,并且来自配置文件。您真的需要在另一个类中定义一个类吗?这只会让我读起来不那么容易。我会把你的问题留给更聪明的人。我只是想指出行'Worker(Server&Server):\u Server(&Server){}是错误的。应该是“Worker(Server&Server):\u Server(Server){}否,但是内部类需要访问外部类成员,因此如果它是外部类,那么我需要将其作为朋友。内部类只会被使用,但外部类会被使用。是的,它实际上在使用ASIO!例如,对于同步,可以使用关键部分
#include <stdio.h>
#include <conio.h>
#include <windows.h>
#include <vector>
using namespace std;
class Server
{
public:
class Worker
{
int m_id;
DWORD m_threadId;
HANDLE m_threadHandle;
bool m_active;
friend Server;
public:
Worker (int id)
{
m_id = id;
m_threadId = 0;
m_threadHandle = 0;
m_active = true;
}
static DWORD WINAPI Run (LPVOID lpParam)
{
Worker* p = (Worker*) lpParam; // it's needed because of the static modifier
while (p->m_active)
{
printf ("I'm a thread #%i\n", p->m_id);
Sleep (1000);
}
return 0;
}
void Stop ()
{
m_active = false;
}
};
Server ()
{
m_workers = new vector <Worker*> ();
m_count = 0;
}
~Server ()
{
delete m_workers;
}
void Run ()
{
puts ("Server is run");
}
void Stop ()
{
while (m_count > 0)
RemoveWorker ();
puts ("Server has been stopped");
}
void AddWorker ()
{
HANDLE h;
DWORD threadId;
Worker* n = new Worker (m_count ++);
m_workers->push_back (n);
h = CreateThread (NULL, 0, Worker::Run, (VOID*) n, CREATE_SUSPENDED, &threadId);
n->m_threadHandle = h;
n->m_threadId = threadId;
ResumeThread (h);
}
void RemoveWorker ()
{
HANDLE h;
DWORD threadId;
if (m_count <= 0)
return;
Worker* n = m_workers->at (m_count - 1);
m_workers->pop_back ();
n->Stop ();
TerminateThread (n->m_threadHandle, 0);
m_count --;
delete n;
}
private:
int m_count;
vector <Worker*>* m_workers;
};
int main (void)
{
Server a;
int com = 1;
a.Run ();
while (com)
{
if (kbhit ())
{
switch (getch ())
{
case 27: // escape key code
com = 0;
break;
case 'a': // add worker
a.AddWorker ();
break;
case 'r': // remove worker
a.RemoveWorker ();
break;
}
}
}
a.Stop ();
return 0;
}