Shared Hell

[Kagamin]

Christopher Wright Wrote:

> > A function that accesses shared data has to put in fences. There's no 
> > way to have the same code deal with shared and unshared code.
> 
> Acquiring a lock on a non-shared instance is safe, just an unnecessary 
> expense. I would have looked into optimizing this expense away rather 
> than punting the problem to the programmer.

Shared code can put data into *really* shared environment, which must not happen for unshared data.