Re: Catching Figure close button - callbacks not running?

[Pavel Hofman]

Hi,

Dne 30. 01. 19 v 9:13 Pantxo napsal(a):
> When graphics callback events are fired from the GUI (main thread), they
> cannot be executed right away because the interpreter (worker thread) may be
> busy with some other task, so the events are stored in an event queue. 

IIUC that does mean the callbacks are executed in the main worker thread 
and do not have a separate thread. That is how my code behaves.


> here are the possible ways to execute the events:
> * The interpreter is idle: every 100ms, Octave processes the eventual events
> that have been stored in the queue

Does calling pause() make the interpreter idle, processing the events? 
While waiting in 
https://octave.sourceforge.io/zeromq/function/zmq_poll.html does not 
make the interpreter idle? That would explain the different behavior of 
Tony's and my code (pause() - callbacks are processed vs. zmq_poll() - 
callbacks are not processed).

> So instead of "flush the event queue" one should read "process events in the
> queue", or anything that does not mean "discard" :-).

Yes that would be a good explanation. The fact that the callback is 
executed by the main work thread is important IMO.

Please what would be the best practice (if any) for executing callbacks 
in another thread so that the main worker thread does not have to wait 
for the callback to finish?

I very much appreciate your help. You guys are great!

Thanks,

Pavel.