Re: Win32. Task or CreateThread

[George J <ivanov_george@list.ru>]

среда, 3 августа 2016 г., 22:43:25 UTC+3 пользователь Dmitry A. Kazakov написал:
> On 2016-08-03 19:31, George J wrote:
> 
> > Dmitry, I've made some examples,works great!Thanks!And I have one
> > question to understand. Function Gtk.Main.Routers.Init has Delay
> > parameter 0.2 by default.
> 
> Yes, that parameter controls the timer set in the GTK main. It rarely 
> need to be faster because except for running curves (e.g. in an 
> oscilloscope) human eye cannot catch higher frequencies anyway.
> 
> > So, to make my parsing function faster I have
> > to decrease this value to 0.001 or 0.00001, am I right?
> 
> No. 1ms (0.001) is the hard limit for thread switching under Windows 
> anyway, while 10ms is the default. Even a real-time OS would choke at 
> 10us timer interrupts.
> 
> > Or is there any
> > function or solution for more "automatical minimal time delay" without
> > my intervention?
> 
> Usually you accumulate changes and report them at the fixed rate 
> comfortable for the user. E.g. if you have a tight loop:
> 
> declare
>     Last_Time : Time := Clock;
>     This_Time : Time;
> begin
>     loop
>        calculate things ...
> 
>        This_Time := Clock;
>        if This_Time - Last_Time > 0.2 then
>           report state change to the GUI ...
>           Last_Time := This_Time;
>        end if;
>     end loop;
> 
> You might further filter out small changes, e.g. if, say, the progress 
> bar change is under 1%, you ignore it.
> 
> Another technique is to run GUI with its own refresh rate and exchange 
> data through shared object (e.g. protected object or protected by a 
> mutex object).
> 
> -- 
> Regards,
> Dmitry A. Kazakov
> http://www.dmitry-kazakov.de

Ok,Dmitry,thanks a lot!