Re: Singletons: can they be ultra-safe?

Hi,

This is one of the questions asked to me and I wanted your opinion
about it. Following is the scenario -

A *x = A::Instance() // A is a singleton class, with thread safty
implemented.
A *y = x;

Now, from here x is given to one thread and y to another:

Thread function body of A:
{
x->DoSomething();
delete x;

}

Thread function body of A:
{
while( y->DoSomething() );

}

Question: Is there anything you (a prgrammer) can do to make it safer?

My Answer: Short answer is "No". Of course I can add reference
counting and only if reference count reaches 0 I will delete the
object (override operator delete). But, there is nothing a programmer
can do that is implicit/compulsory that will avoid the crash.