C++线程安全的单例模式实现

class Singleton{public:static Singleton* getInstance(){if (instance == NULL){//mutex.lock();if (instance == NULL){instance = new Singleton();}//mutex.unlock();}return instance;}private:static Singleton* instance;//Mutex mutex;};Singleton* Singleton::instance = NULL;

Mutex取绝于平台。。。

注意：两次instance == null的判断不可少。才能保证多线程安全，这种方法也叫Double-Check Locking(双重锁定)