add Singleton Pattern

6.Singleton/2.Code/Singleton.h

@@ -0,0 +1,33 @@
+#ifndef __SINGLETON_H__
+#define __SINGLETON_H__
+
+#include <iostream>
+#include <string.h>
+#include <mutex>
+using namespace std;
+
+class Singleton
+{
+public:
+	static Singleton* getInstance(){
+		if (instance == NULL){
+			m_mutex.lock();
+			if (instance == NULL){
+				printf("´´½¨ÐµÄʵÀý\n");
+				instance = new Singleton();
+			}
+			m_mutex.unlock();
+		}
+		return instance;
+	}
+private:
+	Singleton(){}
+
+	static Singleton* instance;
+	static std::mutex m_mutex;
+};
+
+Singleton* Singleton::instance = NULL;
+std::mutex Singleton::m_mutex;
+
+#endif //__SINGLETON_H__

6.Singleton/2.Code/main.cpp

@@ -0,0 +1,50 @@
+#include <iostream>
+#include "Singleton.h"
+
+/*单例模式简单实现*/
+/*
+int main()
+{
+	Singleton *s1 = Singleton::getInstance();
+	Singleton *s2 = Singleton::getInstance();
+
+	system("pause");
+	return 0;
+}
+*/
+
+/*非线程安全 单例模式*/
+#include <process.h>
+#include <Windows.h>
+
+//多线程，线程数目：5
+#define THREAD_NUM 5
+
+unsigned int __stdcall CallSingleton(void *pPM)
+{
+	Singleton *s = Singleton::getInstance();
+	int nThreadNum = *(int *)pPM; 
+	Sleep(50);
+	//printf("线程编号为%d\n", nThreadNum);
+	return 0;
+}
+
+
+int main()
+{
+	HANDLE  handle[THREAD_NUM];
+
+	//线程编号
+	int threadNum = 0;
+	while (threadNum < THREAD_NUM)
+	{
+		handle[threadNum] = (HANDLE)_beginthreadex(NULL, 0, CallSingleton, &threadNum, 0, NULL);
+		//等子线程接收到参数时主线程可能改变了这个i的值
+		threadNum++;
+	}
+	//保证子线程已全部运行结束
+	WaitForMultipleObjects(THREAD_NUM, handle, TRUE, INFINITE);
+
+	system("pause");
+	return 0;
+}