C++多线程编程第十二讲--windows临界区、其他各种mutex互斥量

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//(1)windows临界区 #include<iostream> #include<thread> #include<vector> #include<list> #include<mutex>   #include<windows.h>   #define _WINDOWS    //定义一个开关   using namespace std;   class A { public:     A()     { #ifdef _WINDOWS         InitializeCriticalSection(&my_winsec);    //用临界区之前要先初始化 #endif // _WINDOWS     }   public:     //把收到的消息，入到一个队列中     void inMsgRecvQueue()     {         int i;         for (i = 0; i < 100000; ++i)         {             cout << "push_back num = " << i << endl;             //lock之后只能有一个线程可以对msgQueue队列做操作 #ifdef _WINDOWS             EnterCriticalSection(&my_winsec);             msgQueue.push_back(i);                   //数字i就是玩家的命令。             LeaveCriticalSection(&my_winsec); #else             my_mutex.lock();             msgQueue.push_back(i);                   //数字i就是玩家的命令。             my_mutex.unlock(); #endif //                }     }       bool outMsgProc(int& command)     { #ifdef _WINDOWS         EnterCriticalSection(&my_winsec);         if (!msgQueue.empty())         {             //消息不为空             command = msgQueue.front();             msgQueue.pop_front();          //移除首元素               LeaveCriticalSection(&my_winsec);             return true;         }         else         {             LeaveCriticalSection(&my_winsec);             return false;         } #else         my_mutex.lock();         if (!msgQueue.empty())         {             //消息不为空             command = msgQueue.front();             msgQueue.pop_front();          //移除首元素               my_mutex.unlock();             return true;         }         else         {             my_mutex.unlock();             return false;         } #endif        }       //把数据从消息队列中取出     void outMsgRecvQueue()     {         int i;         int command = 0;         for (i = 0; i < 100000; ++i)         {             int result = outMsgProc(command);             if (result == true)             {                 cout << "command = " << command << endl;             }             else             {                 cout << "msgQueue is empty" << endl;             }         }     }   private:     list<int> msgQueue;     mutex my_mutex;       //创建一个互斥量 #ifdef _WINDOWS     CRITICAL_SECTION my_winsec;     //windows下的临界区，非常类似C++的mutex #endif // _WINDOES   };   int main() {     A myobj;       thread myOutMsg(&A::outMsgRecvQueue, std::ref(myobj));   //保证线程中用的同一个对象     thread myInMsg(&A::inMsgRecvQueue, std::ref(myobj));       myOutMsg.join();     myInMsg.join();       cout << "main thread end..." << endl;     return 0; }   //(2)多次进入临界区试验   #include<iostream> #include<thread> #include<vector> #include<list> #include<mutex>   #include<windows.h>   #define _WINDOWS    //定义一个开关   using namespace std;   class A { public:     A()     { #ifdef _WINDOWS         InitializeCriticalSection(&my_winsec);    //用临界区之前要先初始化 #endif // _WINDOWS     }   public:     //把收到的消息，入到一个队列中     void inMsgRecvQueue()     {         int i;         for (i = 0; i < 100000; ++i)         {             cout << "push_back num = " << i << endl;             //lock之后只能有一个线程可以对msgQueue队列做操作 #ifdef _WINDOWS             EnterCriticalSection(&my_winsec);             EnterCriticalSection(&my_winsec);     //这是允许的，但是对应的离开也需要写两次             msgQueue.push_back(i);                   //数字i就是玩家的命令。             LeaveCriticalSection(&my_winsec);             LeaveCriticalSection(&my_winsec);     //如果这个没有的话，相当于还是一直加着锁。 #else             my_mutex.lock();             //my_mutex.lock();                        //会报错，和windows有区别             msgQueue.push_back(i);                   //数字i就是玩家的命令。             my_mutex.unlock(); #endif //                }     }       bool outMsgProc(int& command)     { #ifdef _WINDOWS         EnterCriticalSection(&my_winsec);         if (!msgQueue.empty())         {             //消息不为空             command = msgQueue.front();             msgQueue.pop_front();          //移除首元素               LeaveCriticalSection(&my_winsec);             return true;         }         else         {             LeaveCriticalSection(&my_winsec);             return false;         } #else         my_mutex.lock();         if (!msgQueue.empty())         {             //消息不为空             command = msgQueue.front();             msgQueue.pop_front();          //移除首元素               my_mutex.unlock();             return true;         }         else         {             my_mutex.unlock();             return false;         } #endif        }       //把数据从消息队列中取出     void outMsgRecvQueue()     {         int i;         int command = 0;         for (i = 0; i < 100000; ++i)         {             int result = outMsgProc(command);             if (result == true)             {                 cout << "command = " << command << endl;             }             else             {                 cout << "msgQueue is empty" << endl;             }         }     }   private:     list<int> msgQueue;     mutex my_mutex;       //创建一个互斥量 #ifdef _WINDOWS     CRITICAL_SECTION my_winsec;     //windows下的临界区，非常类似C++的mutex #endif // _WINDOES   };   int main() {     A myobj;       thread myOutMsg(&A::outMsgRecvQueue, std::ref(myobj));   //保证线程中用的同一个对象     thread myInMsg(&A::inMsgRecvQueue, std::ref(myobj));       myOutMsg.join();     myInMsg.join();       cout << "main thread end..." << endl;     return 0; }   //(3)自动析构技术   // std::lock_guard<std::mutex>   //自动加锁和解锁   #include<iostream> #include<thread> #include<vector> #include<list> #include<mutex>   #include<windows.h>   #define _WINDOWS    //定义一个开关   using namespace std;   //自动加锁，自动释放锁的写法，类似与lock_guard的写法 class CWinLock { public:     CWinLock(CRITICAL_SECTION* _my_winsec) :my_winsec(_my_winsec)     {         EnterCriticalSection(my_winsec);     }       ~CWinLock()     {         LeaveCriticalSection(my_winsec);     } private:     CRITICAL_SECTION* my_winsec;     //windows下的临界区，非常类似C++的mutex };   class A { public:     A()     { #ifdef _WINDOWS         InitializeCriticalSection(&my_winsec);    //用临界区之前要先初始化 #endif // _WINDOWS     }   public:     //把收到的消息，入到一个队列中     void inMsgRecvQueue()     {         int i;         for (i = 0; i < 100000; ++i)         {             cout << "push_back num = " << i << endl;             //lock之后只能有一个线程可以对msgQueue队列做操作 #ifdef _WINDOWS             CWinLock clock(&my_winsec);              //RAII的写法             msgQueue.push_back(i);                   //数字i就是玩家的命令。   #else             std::lock_guard<std::mutex> lock_g(my_mutex);   //自动加锁，自动释放锁。以{}为范围             //my_mutex.lock();             //my_mutex.lock();                        //会报错，和windows有区别             msgQueue.push_back(i);                   //数字i就是玩家的命令。             //my_mutex.unlock(); #endif //                }     }       bool outMsgProc(int& command)     { #ifdef _WINDOWS         EnterCriticalSection(&my_winsec);         if (!msgQueue.empty())         {             //消息不为空             command = msgQueue.front();             msgQueue.pop_front();          //移除首元素               LeaveCriticalSection(&my_winsec);             return true;         }         else         {             LeaveCriticalSection(&my_winsec);             return false;         } #else         my_mutex.lock();         if (!msgQueue.empty())         {             //消息不为空             command = msgQueue.front();             msgQueue.pop_front();          //移除首元素               my_mutex.unlock();             return true;         }         else         {             my_mutex.unlock();             return false;         } #endif        }       //把数据从消息队列中取出     void outMsgRecvQueue()     {         int i;         int command = 0;         for (i = 0; i < 100000; ++i)         {             int result = outMsgProc(command);             if (result == true)             {                 cout << "command = " << command << endl;             }             else             {                 cout << "msgQueue is empty" << endl;             }         }     }   private:     list<int> msgQueue;     mutex my_mutex;       //创建一个互斥量 #ifdef _WINDOWS     CRITICAL_SECTION my_winsec;     //windows下的临界区，非常类似C++的mutex #endif // _WINDOES   };   int main() {     A myobj;       thread myOutMsg(&A::outMsgRecvQueue, std::ref(myobj));   //保证线程中用的同一个对象     thread myInMsg(&A::inMsgRecvQueue, std::ref(myobj));       myOutMsg.join();     myInMsg.join();       cout << "main thread end..." << endl;     return 0; }   //(4)recursive_mutex递归的独占互斥量   #include<iostream> #include<thread> #include<vector> #include<list> #include<mutex>   #include<windows.h>   //#define _WINDOWS    //定义一个开关   using namespace std;   //自动加锁，自动释放锁的写法，类似与lock_guard的写法 class CWinLock { public:     CWinLock(CRITICAL_SECTION* _my_winsec) :my_winsec(_my_winsec)     {         EnterCriticalSection(my_winsec);     }       ~CWinLock()     {         LeaveCriticalSection(my_winsec);     } private:     CRITICAL_SECTION* my_winsec;     //windows下的临界区，非常类似C++的mutex };   class A { public:     A()     { #ifdef _WINDOWS         InitializeCriticalSection(&my_winsec);    //用临界区之前要先初始化 #endif // _WINDOWS     }   public:     //把收到的消息，入到一个队列中     void inMsgRecvQueue()     {         int i;         for (i = 0; i < 100000; ++i)         {             cout << "push_back num = " << i << endl;             //lock之后只能有一个线程可以对msgQueue队列做操作 #ifdef _WINDOWS             CWinLock clock(&my_winsec);              //RAII的写法             msgQueue.push_back(i);                   //数字i就是玩家的命令。   #else             my_mutex.lock();             my_mutex.lock();                        //会报错，和windows有区别             msgQueue.push_back(i);                   //数字i就是玩家的命令。             my_mutex.unlock();             my_mutex.unlock(); #endif //                }     }       bool outMsgProc(int& command)     { #ifdef _WINDOWS         EnterCriticalSection(&my_winsec);         if (!msgQueue.empty())         {             //消息不为空             command = msgQueue.front();             msgQueue.pop_front();          //移除首元素               LeaveCriticalSection(&my_winsec);             return true;         }         else         {             LeaveCriticalSection(&my_winsec);             return false;         } #else         my_mutex.lock();         if (!msgQueue.empty())         {             //消息不为空             command = msgQueue.front();             msgQueue.pop_front();          //移除首元素               my_mutex.unlock();             return true;         }         else         {             my_mutex.unlock();             return false;         } #endif        }       //把数据从消息队列中取出     void outMsgRecvQueue()     {         int i;         int command = 0;         for (i = 0; i < 100000; ++i)         {             int result = outMsgProc(command);             if (result == true)             {                 cout << "command = " << command << endl;             }             else             {                 cout << "msgQueue is empty" << endl;             }         }     }   private:     list<int> msgQueue;     //mutex my_mutex;       //创建一个互斥量，是一个独占互斥量     //是一个递归的独占互斥量,在同一个线程内，可以多次lock，但也需要多次unlock，需要相对应     recursive_mutex my_mutex;    //与windows中的CRITICAL_SECTION更像 #ifdef _WINDOWS     CRITICAL_SECTION my_winsec;     //windows下的临界区，非常类似C++的mutex #endif // _WINDOES   };   int main() {     A myobj;       thread myOutMsg(&A::outMsgRecvQueue, std::ref(myobj));   //保证线程中用的同一个对象     thread myInMsg(&A::inMsgRecvQueue, std::ref(myobj));       myOutMsg.join();     myInMsg.join();       cout << "main thread end..." << endl;     return 0; }   //(5)带超时的互斥量std::timed_mutex和std::recursive_timed_mutex     //try_lock_for()            //等待一段时间     //try_lock_until()          //未来的时间点   #include<iostream> #include<thread> #include<vector> #include<list> #include<mutex>   #include<windows.h>   //#define _WINDOWS    //定义一个开关   using namespace std;   class A { public:     A()     { #ifdef _WINDOWS         InitializeCriticalSection(&my_winsec);    //用临界区之前要先初始化 #endif // _WINDOWS     }   public:     //把收到的消息，入到一个队列中     void inMsgRecvQueue()     {         int i;         for (i = 0; i < 100000; ++i)         {             cout << "push_back num = " << i << endl;             //lock之后只能有一个线程可以对msgQueue队列做操作 #ifdef _WINDOWS             CWinLock clock(&my_winsec);              //RAII的写法             msgQueue.push_back(i);                   //数字i就是玩家的命令。               #else             if (my_mutex.try_lock_until(chrono::steady_clock::now()+100ms))   //等待100ms来判断是否拿到锁             {                 msgQueue.push_back(i);                   //数字i就是玩家的命令。                   my_mutex.unlock();             }             else             {                 cout << "Do not get lock..." << endl;             }              #endif //                }     }       bool outMsgProc(int& command)     { #ifdef _WINDOWS         EnterCriticalSection(&my_winsec);         if (!msgQueue.empty())         {             //消息不为空             command = msgQueue.front();             msgQueue.pop_front();          //移除首元素               LeaveCriticalSection(&my_winsec);             return true;         }         else         {             LeaveCriticalSection(&my_winsec);             return false;         } #else         my_mutex.lock();         if (!msgQueue.empty())         {             //消息不为空             command = msgQueue.front();             msgQueue.pop_front();          //移除首元素               my_mutex.unlock();             return true;     }         else         {             my_mutex.unlock();             return false;         } #endif        }       //把数据从消息队列中取出     void outMsgRecvQueue()     {         int i;         int command = 0;         for (i = 0; i < 100000; ++i)         {             int result = outMsgProc(command);             if (result == true)             {                 cout << "command = " << command << endl;             }             else             {                 cout << "msgQueue is empty" << endl;             }         }     }   private:     list<int> msgQueue;     std::timed_mutex my_mutex; #ifdef _WINDOWS     CRITICAL_SECTION my_winsec;     //windows下的临界区，非常类似C++的mutex #endif // _WINDOES   };   int main() {     A myobj;       thread myOutMsg(&A::outMsgRecvQueue, std::ref(myobj));   //保证线程中用的同一个对象     thread myInMsg(&A::inMsgRecvQueue, std::ref(myobj));       myOutMsg.join();     myInMsg.join();       cout << "main thread end..." << endl;     return 0; }