Re: pgbench - rework variable management

>> Patch v5 is a rebase with some adjustements.
>
> This patch is failing on the Windows build:
> https://ci.appveyor.com/project/postgresql-cfbot/postgresql/build/1.0.85698
>
> I'm not sure if this had been fixed in v3 and this is a new issue or if it 
> has been failing all along.  Either way, it should be updated.

I don't do windows, so the mutex stuff for windows is just blind 
programming.

> Marked Waiting on Author.
>
> BTW -- sorry if I seem to be picking on your patches but these happen to be 
> the patches with the longest time since any activity.

Basically, my areas of interest do not match committers' areas of 
interest.

v6 is a yet-again blind attempt at fixing the windows mutex. If someone 
with a windows could tell me if it is ok, and if not what to fix, it would 
be great.

-- 
Fabien.