- // controlled_module_ex.hpp : controlled_module類的擴展
- // 增強線程之間消息通訊
- // 增加線程安全啓動和安全關閉功能
- // 增加定時器功能
- #pragma once
- #include <boost/shared_ptr.hpp>
- #include <boost/any.hpp>
- #include "controlled_module.hpp"
- struct _command
- {
- typedef boost::shared_ptr<_command> CCmdPtr;
- unsigned int nCmd;
- boost::any anyParam;
- };
- struct _wait_command
- {
- boost::any par;
- unsigned int command;
- void * event;
- boost::shared_ptr<boost::any> resp;
- };
- class controlled_module_ex;
- struct _notify
- {
- controlled_module_ex * sender;
- int id;
- boost::any par;
- };
- #define BM_RESERVE 1000
- #define BM_RING_START BM_RESERVE+1
- #define BM_RING_STOP BM_RESERVE+2
- #define BM_RING_SETTIME BM_RESERVE+3
- #define BM_RING_SETPARENT BM_RESERVE+4
- #define BM_RING_CYCLE BM_RESERVE+5
- #define BM_RING_PROCESS BM_RESERVE+6
- #define BM_RING_PROCESSEND BM_RESERVE+7
- #define BM_RING_PROCESSFAIL BM_RESERVE+8
- #define BM_TIMER BM_RESERVE+9
- #define BM_COMMAND BM_RESERVE+10
- #define BM_NOTIFY BM_RESERVE+11
- #define BM_USER 9000
- class controlled_timer;
- class controlled_module_ex: public controlled_module
- {
- public:
- controlled_module_ex()
- {
- m_safe = false;
- }
- ~controlled_module_ex()
- {
- safestop();
- }
- public:
- template<typename T>
- bool postmessage(unsigned int nCmd, const boost::shared_ptr<T>& p)
- {
- if(this==0||!m_safe)return false;
- boost::mutex::scoped_lock lock(m_mutex_command);
- _command::CCmdPtr cmd(new _command);
- cmd->nCmd = nCmd;
- cmd->anyParam = p;
- m_list_command.push_back(cmd);
- return true;
- }
- boost::any execute(unsigned int command,boost::any par,int timeout=-1)
- {
- boost::shared_ptr<_wait_command> shared(new _wait_command);
- _wait_command & cmd = *shared;
- cmd.command = command;
- cmd.event = (void *)CreateEvent(0,FALSE,FALSE,0);
- cmd.par = par;
- cmd.resp = boost::shared_ptr<boost::any>(new boost::any);
- if(this->postmessage(BM_COMMAND,shared))
- {
- DWORD dw = WaitForSingleObject(cmd.event,timeout);
- CloseHandle(cmd.event);
- if(dw!=WAIT_OBJECT_0)
- return boost::any();
- else
- return *cmd.resp;
- }
- else
- {
- CloseHandle(cmd.event);
- return boost::any();
- }
- }
- void notify(_notify p)
- {
- this->postmessage(BM_NOTIFY,p);
- }
- bool postmessage(unsigned int nCmd,boost::any p)
- {
- if(this==0||!m_safe)
- return false;
- boost::mutex::scoped_lock lock(m_mutex_command);
- _command::CCmdPtr cmd(new _command);
- cmd->nCmd = nCmd;
- cmd->anyParam = p;
- m_list_command.push_back(cmd);
- return true;
- }
- bool postmessage(unsigned int nCmd)
- {
- if(this==0||!m_safe)
- return false;
- boost::mutex::scoped_lock lock(m_mutex_command);
- _command::CCmdPtr cmd(new _command);
- cmd->nCmd = nCmd;
- cmd->anyParam = 0;
- m_list_command.push_back(cmd);
- return true;
- }
- virtual bool work()
- {
- if(!getmessage())
- return false;
- else
- {
- Sleep(this->m_sleeptime);
- return true;
- }
- }
- virtual void message(const _command & cmd)
- {
- if(cmd.nCmd==BM_RING_START)
- {
- this->on_safestart();
- }
- else if(cmd.nCmd==BM_RING_STOP)
- {
- this->on_safestop();
- }
- else if(cmd.nCmd==BM_TIMER)
- {
- this->on_timer(boost::any_cast<controlled_timer*>(cmd.anyParam));
- }
- else if(cmd.nCmd==BM_COMMAND)
- {
- boost::shared_ptr<_wait_command> shared = boost::any_cast< boost::shared_ptr<_wait_command> >(cmd.anyParam);
- _wait_command & cmd = *shared;
- *cmd.resp = this->on_command(cmd.command,cmd.par);
- SetEvent((HANDLE)cmd.event);
- }
- else if(cmd.nCmd==BM_NOTIFY)
- {
- try
- {
- _notify par = boost::any_cast<_notify>(cmd.anyParam);
- this->on_notify(par);
- }
- catch(boost::bad_any_cast)
- {
- }
- }
- }
- virtual void release()
- {
- boost::mutex::scoped_lock lock(m_mutex_command);
- m_list_command.clear();
- }
- void safestart()
- {
- if(!islive())
- start();
- m_safe = true;
- m_safestart_event = (void*)CreateEvent(NULL,FALSE,FALSE,0);
- postmessage(BM_RING_START);
- ::WaitForSingleObject((HANDLE)m_safestart_event,INFINITE);
- CloseHandle(m_safestart_event);
- }
- void safestop()
- {
- if(this->islive())
- {
- m_safe = false;
- m_safestop_event = (void*)CreateEvent(NULL,FALSE,FALSE,0);
- {
- boost::mutex::scoped_lock lock(m_mutex_command);
- _command::CCmdPtr cmd(new _command);
- cmd->nCmd = BM_RING_STOP;
- cmd->anyParam = 0;
- m_list_command.push_back(cmd);
- }
- DWORD dw = ::WaitForSingleObject((HANDLE)m_safestop_event,3*1000);
- if(WAIT_OBJECT_0!=dw)
- {
- }
- CloseHandle(m_safestop_event);
- stop();
- }
- }
- virtual void on_timer(const controlled_timer * p){}
- virtual void on_safestart()
- {
- SetEvent(m_safestart_event);
- }
- virtual void on_safestop()
- {
- SetEvent(m_safestop_event);
- }
- virtual void on_notify(const _notify & p)
- {
- }
- protected:
- virtual boost::any on_command(const unsigned int command,const boost::any par)
- {
- return boost::any();
- }
- bool getmessage()
- {
- std::list<_command::CCmdPtr> cache;
- {
- boost::mutex::scoped_lock lock(m_mutex_command);
- while(!m_list_command.empty())
- {
- _command::CCmdPtr p = m_list_command.front();
- m_list_command.pop_front();
- cache.push_back(p);
- }
- }
- _command::CCmdPtr stop_command;
- std::list<_command::CCmdPtr>::iterator item;
- for(item = cache.begin();item!=cache.end();item++)
- {
- if((*(*item)).nCmd==BM_RING_STOP)
- {
- stop_command = *item;
- break;
- }
- }
- if(stop_command.get()==0)
- {
- while(!cache.empty())
- {
- _command::CCmdPtr p = cache.front();
- cache.pop_front();
- try
- {
- if((*p).nCmd!=BM_RING_START)
- {
- if(!this->m_safe)
- continue;
- }
- this->message(*p);
- }
- catch(boost::bad_any_cast &)
- {
- }
- }
- return true;
- }
- else
- {
- cache.clear();
- this->message(*stop_command);
- return false;
- }
- }
- private:
- void* m_safestart_event;
- void* m_safestop_event;
- bool m_safe;//在多線程,尤其牽涉到線程之間有類似socket級別關聯時,當父線程safestop以後有可能會收到其他線程的postmessage,這時會引起線程死鎖,這個m_safe就是解決這個問題的,當safestop以後不再接收新消息處理
- boost::mutex m_mutex_command;
- std::list<_command::CCmdPtr> m_list_command;
- };
- class controlled_timer: public controlled_module_ex
- {
- public:
- controlled_timer()
- {
- this->m_time = 0;
- this->m_parent = 0;
- this->m_step = 0;
- }
- ~controlled_timer(){
- }
- protected:
- controlled_module_ex* m_parent;
- int m_time;
- int m_step;
- public:
- void starttimer(int time,controlled_module_ex* parent)
- {
- this->safestart();
- this->postmessage(BM_RING_SETPARENT,parent);
- this->postmessage(BM_RING_SETTIME,time);
- }
- void stoptimer()
- {
- this->safestop();
- }
- public:
- virtual void on_safestop()
- {
- m_time = 0;
- controlled_module_ex::on_safestop();
- }
- virtual void message(const _command & cmd)
- {
- controlled_module_ex::message(cmd);
- if(cmd.nCmd==BM_RING_SETTIME)
- {
- int time = boost::any_cast<int>(cmd.anyParam);
- this->m_time = time/this->m_sleeptime;
- this->postmessage(BM_RING_CYCLE);
- }
- else if(cmd.nCmd==BM_RING_SETPARENT)
- {
- this->m_parent = boost::any_cast<controlled_module_ex*>(cmd.anyParam);
- }
- else if(cmd.nCmd==BM_RING_CYCLE)
- {
- if(m_time>0)
- {
- if(m_step>m_time)
- {
- m_parent->postmessage(BM_TIMER,this);
- m_step=0;
- }
- m_step++;
- }
- this->postmessage(BM_RING_CYCLE);
- }
- }
- };
函數controlled_module_ex::postmessage完成消息推送。
虛擬函數controlled_module_ex::message(const _command & cmd)實現消息接收。
- #include "controlled_module_ex.hpp"
- class thdex: public controlled_module_ex
- {
- protected:
- virtual void message(const _command & cmd)
- {
- controlled_module_ex::message(cmd);
- if(cmd.nCmd==BM_USER+1)
- {
- cout << "get message" << endl;
- }
- }
- };
- int _tmain(int argc, _TCHAR* argv[])
- {
- thdex t;
- t.safestart();
- t.postmessage(BM_USER+1);
- char buf[10];
- gets_s(buf,sizeof buf);
- t.safestop();
- return 0;
- }
2.向線程PostMessage,並攜帶簡單對象參數
我們都知道常規的PostMessage要傳參,如果是整型參數,還可以用強制轉換,但如果是其他類型,例如字符串,我們就必須創建一個字符串緩衝,把緩衝指針作爲參數傳過去,線程還不能忘記刪除,否則導致內存泄漏,自定義結構也是一樣的操作,如果想嘗試傳遞一個CString對象,是不可能的。
幸運的是boost提供了boost::any來抽象任何對象類型,controlled_module_ex的消息傳遞都是基於boost::any來完成,程序員可以由此寫出乾淨而且內存安全的代碼。
- #include "controlled_module_ex.hpp"
- struct mystruct
- {
- string a;
- int b;
- };
- class thdex: public controlled_module_ex
- {
- protected:
- virtual void message(const _command & cmd)
- {
- controlled_module_ex::message(cmd);
- if(cmd.nCmd==BM_USER+1)
- {
- cout << "get integer:" << boost::any_cast<int>(cmd.anyParam) << endl;
- }
- if(cmd.nCmd==BM_USER+2)
- {
- cout << "get string:" << boost::any_cast<string>(cmd.anyParam) << endl;
- }
- if(cmd.nCmd==BM_USER+3)
- {
- mystruct par = boost::any_cast<mystruct>(cmd.anyParam);
- cout << "get mystruct:" << par.a << "," << par.b << endl;
- }
- }
- };
- int _tmain(int argc, _TCHAR* argv[])
- {
- thdex t;
- t.safestart();
- t.postmessage(BM_USER+1,123);
- t.postmessage(BM_USER+2,string("hello world"));
- mystruct par;
- par.a = "hello world";
- par.b = 123;
- t.postmessage(BM_USER+3,par);
- char buf[10];
- gets_s(buf,sizeof buf);
- t.safestop();
- return 0;
- }
假如我們書寫了一個錄音子線程,如何將錄製的語音數據傳遞給其他線程呢,常規做法是創建一個緩衝,將語音數據填充進去,然後將緩衝地址作爲參數傳遞,這種做法要求接收線程不能忘記刪除,否則會導致內存泄漏。
幸運的是boost提供了智能指針,可以類似java,c#的智能內存回收一樣來管理內存分配,我們如果使用這個對象來作爲參數傳遞,就可以完美的防範內存泄漏行爲,就算子線程沒有處理,別擔心,內存它會自動回收的。
- #include "controlled_module_ex.hpp"
- struct mystruct
- {
- boost::shared_ptr<char> data;
- int datalen;
- };
- class thdex: public controlled_module_ex
- {
- protected:
- virtual void message(const _command & cmd)
- {
- controlled_module_ex::message(cmd);
- if(cmd.nCmd==BM_USER+1)
- {
- cout << "get sharedptr" << endl; //僅僅得到數據,得不到數據長度
- }
- if(cmd.nCmd==BM_USER+2)
- {
- mystruct par = boost::any_cast<mystruct>(cmd.anyParam);
- cout << "get sharedptr len:" << par.datalen << endl;
- }
- }
- };
- int _tmain(int argc, _TCHAR* argv[])
- {
- thdex t;
- t.safestart();
- t.postmessage(BM_USER+1,boost::shared_ptr<char>(new char[1000]));
- mystruct par;
- par.datalen = 1000;
- par.data = boost::shared_ptr<char>(new char[par.datalen]);
- t.postmessage(BM_USER+2,par);
- char buf[10];
- gets_s(buf,sizeof buf);
- t.safestop();
- return 0;
- }
函數controlled_module_ex::execute完成這個工作
虛擬函數controlled_module_ex::on_command(const unsigned int command,const boost::any par)響應消息處理
- #include "controlled_module_ex.hpp"
- class thdex: public controlled_module_ex
- {
- protected:
- boost::any on_command(const unsigned int command,const boost::any par)
- {
- if(command==1)
- {
- cout << "on command" << endl;
- return 0;
- }
- if(command==2)
- {
- cout << "on command,par:" << boost::any_cast<string>(par) << endl;
- return 0;
- }
- if(command==3)
- {
- return true;
- }
- else
- return controlled_module_ex::on_command(command,par);
- }
- };
- int _tmain(int argc, _TCHAR* argv[])
- {
- thdex t;
- t.safestart();
- t.execute(1,0);//等待子線程處理完成
- t.execute(2,string("hello world"));//帶參數 等待子線程完成
- bool rs = boost::any_cast<bool>(t.execute(3,0));//等待子線程處理完成,並取得返回值
- cout << "get thread result:" << rs << endl;
- boost::any timeout = t.execute(4,0,1000);//等待子線程處理,超時1秒
- if(timeout.empty())
- cout << "timeout " << endl;
- char buf[10];
- gets_s(buf,sizeof buf);
- t.safestop();
- return 0;
- }
類似於CWnd::OnTimer,controlled_module_ex也提供一個虛擬函數virtual void on_timer(const controlled_timer * p);來處理定時
- #include "controlled_module_ex.hpp"
- class thdex: public controlled_module_ex
- {
- protected:
- virtual void on_timer(const controlled_timer *p)
- {
- cout << "ontimer" << endl;
- }
- };
- int _tmain(int argc, _TCHAR* argv[])
- {
- thdex t;
- controlled_timer timer;
- t.safestart();
- timer.starttimer(1000,&t);
- char buf[10];
- gets_s(buf,sizeof buf);
- t.safestop();
- return 0;
- }