Re: lua on ARM7

[Asko Kauppi <askok@...>]

Ah, yeah.

Your flag thing is a "one entry queue" but I was expecting Bert not  
to want to lose a single interrupt (and them to be different, like  
having some data values attached, that Lua would care about).

Anyways, already this is getting speculative, since we don't know  
what Bert does. Bert: if you want an event dispatch queue, I can send  
code I've used in LuaX/SDL_mixer, to catch played music samples at  
real time (and show the graphs by Lua). Don't remember about memory  
allocation, but yes, most likely one alloc per interrupt is needed  
there.

-asko


David Given kirjoitti 15.5.2006 kello 20.00:

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> Asko Kauppi wrote:
> [...]
> > I would consider doing an "event dispatch" interrupt handler (in  
> > C) that
> > would sit in the other end of a FIFO queue, the other end being  
> > polled
> > by Lua (can you run one instance, as the main loop?) to take in
> > "commands".
> [...]
>
> A common technique is to have the interrupt handler set a bit to say
> 'this interrupt has happened'. Your userspace code then polls all the
> various bits, does its work, and then clears them again. Getting the
> logic right to ensure that all interrupts are properly serviced is  
> a bit
> challenging, and of course you lose any kind of real-time-ness, but it
> does allow you to avoid having to allocate memory during your  
> interrupt
> handler.
>
> - --
> +- David Given --McQ-+ "Preacher, don't the Bible have some pretty
> |  dg@cowlark.com    | specific things to say about killing?" "Quite
> | (dg@tao-group.com) | specific. It is, however, somewhat fuzzier  
> on the
> +- www.cowlark.com --+ subject of kneecaps." --- Firefly, _War  
> Stories_
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