Testing some singleton implementations

[Stanislav Blinov]

On Wednesday, 5 February 2014 at 08:39:08 UTC, Andrej Mitrovic 
wrote:

> No difference, but maybe the timing precision isn't proper. It 
> always displays one of 3/3.25/4 msecs.

Hmm... It should be as proper as it gets, judging from 
StopWatch's docs.

> Anywho what's important is that Atomic is really speedy and 
> Sync is almost as fast. Except with DMD  which is
> bad at optimizing this specific code.

Yup, at least we have two fast low-lock implementations to choose 
from depending on platform's capabilities regarding TLS and 
atomics.