[fpc-pascal] Support for "class threadvar" sections inside class and record types

[Sven Barth]

R0b0t1 <r030t1 at gmail.com> schrieb am Sa., 23. Juni 2018, 18:50:

> On Saturday, June 23, 2018, Ryan Joseph <ryan at thealchemistguild.com>
> wrote:
> >
> >
> >> On Jun 23, 2018, at 9:45 PM, Sven Barth via fpc-pascal <
> fpc-pascal at lists.freepascal.org> wrote:
> >>
> >> See also here: https://www.freepascal.org/docs-html/ref/refse26.html
> >
> > I had no idea this existed. When was it added?
> >
> > Regards,
> >         Ryan Joseph
> >
>
> I found them one day as well and was confused. The note that they
> implement TMonitor is helpful. I know of no other uses.
>

The TMonitor was a guess by Michael.
Threadvars themselves have many uses: the per thread heap management that
FPC's heap uses, one output file per thread, so that StdOut doesn't cross,
the current TThread instance using TThread.CurrentThread (which Delphi
probably implemented using a private class threadvar while for FPC I used a
global threadvar in the implementation section) and so on.

Regards,
Sven

>
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