关于线程安全引用计数的另一个问题

void String::Release()
{
    if ( 0 == AtomicDecrement( &refCounter ) ) )
        delete buffer;
}

String* globalString = new String(); // refCount == 1 after that.

// thread 0:
delete globalString; 
  // This invokes String::Release().
  // After AtomicDecrement() counter becomes zero. 
  // Exactly after atomic decrement current thread switches to thread 1.

// thread 1:
String myCopy = *globalString;
  // This invokes AddRef(); 
  // globalString is alive;
  // internal buffer is still not deleted but refCounter is zero;
  // We increment and switch back to thread 0 where buffer will be 
  // succefully deleted;