| Re: [AD] Timer interrupts and drawing |
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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
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