Most basic nothrow, pure, @safe functions?

[Walter Bright]

On 3/21/2014 12:59 AM, monarch_dodra wrote:
> Ok. That's a fair point. So in that case, our function is pointing at "data",
> and is allowed to mutate it, and observe its state.
>
> Now, if *another* piece of code is doing the same thing at the same time
> (potentially mutating "data", does that still violate purity?

A mutex essentially reads and writes a global flag, which other functions can 
also read and write.

That makes it NOT pure.