一种线程安全的单例模式实现

#include <iostream> #include <vector> #include <bitset> #include <assert.h> #include <Windows.h> #include <process.h> using namespace std; class CSingleton { private: class CAssistForSingleton { private: CRITICAL_SECTION m_cs; public: CAssistForSingleton() { InitializeCriticalSection(&m_cs); } ~CAssistForSingleton() { DeleteCriticalSection(&m_cs); } public: void Lock() { EnterCriticalSection(&m_cs); } void UnLock() { LeaveCriticalSection(&m_cs); } }; private: static CAssistForSingleton m_refSycObj; static CSingleton *m_pInstance; static int m_nData; private: CSingleton() { } public: static CSingleton *GetInstatnce() { m_refSycObj.Lock(); if (NULL == m_pInstance) { m_pInstance = new CSingleton; cout<<"new CSingleton"<<endl; } m_refSycObj.UnLock(); return m_pInstance; } public: static int GetData() { return m_nData; } static void SetData(int nData) { m_refSycObj.Lock(); m_nData = nData; m_refSycObj.UnLock(); } }; CSingleton::CAssistForSingleton CSingleton::m_refSycObj = CSingleton::CAssistForSingleton(); CSingleton *CSingleton::m_pInstance = NULL; int CSingleton::m_nData = 0; unsigned int WINAPI ThreadFun(void *) { cout<<"Launcher Thread"<<endl; for(int i = 0 ; i < 99999999 ; i++) { CSingleton *pSingl = CSingleton::GetInstatnce(); if (NULL != pSingl) { pSingl->SetData(i); } Sleep(500); } return 0; } int main(int argv, char *argc[]) { uintptr_t HandleThread[10]; unsigned int nThreadId = 0; for(int i = 0 ; i < 10 ; i++) { HandleThread[i] = _beginthreadex(NULL, 0, ThreadFun, NULL, 0, &nThreadId); } WaitForMultipleObjects(10, (const HANDLE *)HandleThread, TRUE, INFINITE); return 0; }