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August 01, 2004

C++ and the Perils of Double-Checked Locking: Part II

(Page 8 of 9)
August, 2004: C++ and the Perils of Double-Checked Locking: Part II 

class Singleton {
public:
static volatile Singleton* volatile instance();
   ...
private:
   // one more volatile added
   static volatile Singleton* volatile pInstance;
};
// from the implementation file
volatile Singleton* volatile Singleton::pInstance = 0;
volatile Singleton* volatile Singleton::instance() {
   if (pInstance == 0) {
      Lock lock;
      if (pInstance == 0) {
        // one more volatile added
        volatile Singleton* volatile temp =
           new volatile Singleton;
        pInstance = temp;
      }
   }
   return pInstance;
}

Example 9: A glorified version of Singleton.

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