Re: [AD] Timer interrupts and drawing

[Thomas Fjellstrom <tfjellstrom@xxxxxxxxxx>]

On Monday 25 August 2008, Ryan Dickie wrote:
> On Sun, Aug 24, 2008 at 11:41 PM, Thomas Fjellstrom <tfjellstrom@xxxxxxxxxx> 
wrote:
> > On Monday 25 August 2008, Colin Ward wrote:
> >> I have a game here that is crashing and when I investigated it, it is
> >> installing a timer with install_int() and in that timer's callback it is
> >> calling drawing routines to draw things according to the mouse's current
> >> position.
> >>
> >> According to the documentation for install_int() you should consider
> >> that you are being called from an interrupt context, so am I correct in
> >> thinking that calling drawing routines from a timer callback is NOT
> >> allowed?
> >
> > Pretty much. In Windows and X, timers all run from a (single) separate
> > thread, and in DOS, it all runs from an interrupt. Doing anything to
> > complex global data is bad, and doing more than a few basic instructions
> > is also bad.
> >
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> > --
> > Thomas Fjellstrom
> > tfjellstrom@xxxxxxxxxx
> >
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>
> Given a lot of that data is stored in thread-local-storage, you can't
> really use a timer callback. I do encourage using the event-loop
> though. It's response latency is actually quite good anyways.
>
> --ryan

I don't think he's using 4.9 yet. could be wrong though.

-- 
Thomas Fjellstrom
tfjellstrom@xxxxxxxxxx