[PD-dev] Polling: Execute a function every X ms from within the external.

[Christof Ressi]

Here's how:

struct t_myexternal {
     t_object x_obj;
     t_clock *x_clock;
     int x_running;
};

void tick(t_myexternal *x)
{
     // do some work
     // then reschedule (if not cancelled)
     if (x->x_running)
         clock_delay(x->x_clock, POLLINTERVAL);
}

void start(t_myexternal *x)
{
     clock_delay(x->x_clock, 0);
     x->x_running = true;
}

void stop(t_myexternal *x)
{
     x->x_running = false;
}

void* myexternal_new(void)
     t_myexternal *x = pd_new(myexternal_class);
     x->x_clock = clock_new(x, (t_method)tick);
     x->x_running = false;
}

Hope this helps!

Christof
On 29.04.2021 18:12, Kyriakos Charalampides via Pd-dev wrote:
> I recently started learning how to write some custom pd externals. It has been quite fun until now, but its been a few days I am stuck in a loop. I want to read a buffer coming from an external device every 1 ms. I could do that with a metro but this can cause several issues with this buffer.
>
> My initial though was to use a for loop but this was obviously a horrible idea since pd will stuck in the for loop and hang. Then I though to use a clock to execute my reading function but all examples with clock and clock_delay seem to be based on for and while loops. What I would really like to achieve is to execute the reading function every 1ms and interrupt this process every time that  a new message is coming from pd.
>
> Any tips or ideas will be highly appreciated.
>
> All best,
> Kyr
>
>
> _______________________________________________
> Pd-dev mailing list
> Pd-dev at lists.iem.at
> https://lists.puredata.info/listinfo/pd-dev
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.puredata.info/pipermail/pd-dev/attachments/20210429/0a59d29d/attachment.htm>