datetime review part 2

[Kagamin]

Jonathan M Davis Wrote:

> totally fries Clock.currAppTick(), which tells you how long the application has 
> been running. The documentation for QueryPermanceCounter() and clock_gettime() 
> give no indication that the clock stops counting when a thread is sleeping.

I think, QueryPermanceCounter just queries processor's builtin counter (HPET). So it's hardware implementation defined. HPET is not present on older hardware, and future hardware can implement something different.