> Is there anything special about singletons here?
No, aside from the fact that the root commenter clearly understands the issue with global variables, but not necessarily singletons.
I'm trying to use the singleton concept as a "teaching bridge" moment, as the Singleton is clearly "like a global variable" in terms of the data-race, but generalizes to any object in your code.
The commenter I'm replying seems to think that global-variables are the only kind of variable where this problem occurs. He's wrong. All objects and all variables have this problem.
No, aside from the fact that the root commenter clearly understands the issue with global variables, but not necessarily singletons.
I'm trying to use the singleton concept as a "teaching bridge" moment, as the Singleton is clearly "like a global variable" in terms of the data-race, but generalizes to any object in your code.
The commenter I'm replying seems to think that global-variables are the only kind of variable where this problem occurs. He's wrong. All objects and all variables have this problem.