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

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