利用C++模板特性实现的简单通用线程池
线程池的作用:是为了减少创建和销毁线程所消耗的时间。所以需要事先创建好一定数量的线程,并让这些线程处于等待或挂起状态,等待特定事件的唤醒线程的实现分为3部分 1.异步存取的队列 2.抽象的任务基类提供了一个任务接口 3.线程池实现://///////////////////////////////////////////////////////////////////////////////////////// 任务队列#include <iostream>#include <list>#include <Windows.h>#include <process.h>template <typename _Ty>class AsynchQueue{public: AsynchQueue(); ~AsynchQueue();public: void Edqueue(_Ty* data); _Ty* Dequeue();private: HANDLE m_hEvent; HANDLE m_hMutex; list<_Ty*> m_queue; AsynchQueue(const AsynchQueue &); AsynchQueue& operator= (const AsynchQueue &);};// 抽象的任务类class Task{public: virtual void DoTask() = 0;};// 线程池class ThreadPool{ public: ThreadPool(int threadnum,bool release); ~ThreadPool();private: static unsigned int __stdcall threadfun(void* lpParam);public: void Assignment(Task* task); void Work(); bool IsStopping();private: int m_iThreadnum; AsynchQueue<Task> m_queue; list<HANDLE> m_hThreads; HANDLE m_hMutex; bool m_stopMe; bool m_releaseTask;};/////////////////////////////////////////////////////////////////////////////////////////// 任务队列 实现部分#include "_threadpool.h"template<typename _Ty>AsynchQueue<_Ty>::AsynchQueue(){ m_hEvent = ::CreateEvent(NULL,FALSE,FALSE,NULL); m_hMutex = ::CreateMutex(NULL,FALSE,NULL);}template<typename _Ty>AsynchQueue<_Ty>::~AsynchQueue(){ ::CloseHandle(m_hEvent); ::CloseHandle(m_hMutex);}template<typename _Ty>void AsynchQueue<_Ty>::Edqueue(_Ty * data){ ::WaitForSingleObject(m_hMutex,INFINITE); m_queue.push_back(data); ::ReleaseMutex(m_hMutex); ::SetEvent(m_hEvent);}template<typename _Ty>_Ty* AsynchQueue<_Ty>::Dequeue(){ ::WaitForSingleObject(m_hEvent,INFINITE); ::WaitForSingleObject(m_hMutex,INFINITE); _Ty* data = m_queue.front(); m_queue.pop_front(); if(m_queue.size() > 0) ::SetEvent(m_hEvent); ::ReleaseMutex(m_hMutex); return data;}// 线程池实现部分ThreadPool::ThreadPool(int threadnum,bool release){ m_iThreadnum = threadnum; for(int i = 0 ; i < threadnum ; i++) { HANDLE hThread; hThread = (HANDLE)_beginthreadex(NULL,0,threadfun,this,0,NULL); m_hThreads.push_back(hThread); } m_hMutex = ::CreateMutex(NULL,FALSE,NULL); m_stopMe = false;}ThreadPool::~ThreadPool(){ ::WaitForSingleObject(m_hMutex,INFINITE); m_stopMe = true; ::ReleaseMutex(m_hMutex); HANDLE* handles = new HANDLE[m_iThreadnum]; int i = 0; list<HANDLE>::iterator item; for(item = m_hThreads.begin() ; item != m_hThreads.end() ;++item) { handles[i++] = *(item); } ::WaitForMultipleObjects(m_iThreadnum,handles,TRUE,INFINITE); // 等待所有线程 for(item = m_hThreads.begin() ; item != m_hThreads.end(); ++item) { ::CloseHandle(*item); } delete[] handles; ::CloseHandle(m_hMutex);}void ThreadPool::Assignment(Task* task){ m_queue.Edqueue(task);}bool ThreadPool::IsStopping(){ ::WaitForSingleObject(m_hMutex,INFINITE); bool stop = m_stopMe; ::ReleaseMutex(m_hMutex); return stop;}void ThreadPool::Work(){ Task* task = m_queue.Dequeue(); task->DoTask(); if(m_releaseTask) { delete task; }}unsigned int __stdcall ThreadPool::threadfun(void *lpParam){ ThreadPool* pThis = static_cast<ThreadPool*>(lpParam); while(!pThis->IsStopping()) { pThis->Work(); } return 0;}/////////////////////////////////////////////////////////////////////////////////////////// 测试部分#include "_threadpool.h"#include <string>using namespace std;class TestTask : public Task{public: TestTask(string sval){m_sval = sval;} virtual void DoTask() { cout << "Excute task :"<< m_sval << endl; }private: string m_sval;};int main(int _args,char* _argc){ ThreadPool* pool = new ThreadPool(5,true); pool->Assignment(new TestTask("hello world")); pool->Assignment(new TestTask("Simple Thread Pool")); int nstop; cin >> nstop;}
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