Clear Filters
Clear Filters

GUI program with parfeval

4 views (last 30 days)
Hello Matlab community, I'm enhancing a GUI program with mouse events and simultaneously accessing an online database. My idea to avoid GUI hangs while querying the database is as follows:
thread_ptr = parfeval(@(c, varargin) fetch(c.Value, varargin{:}), 1, c, query);
pause(3) % not stop mouse events during query
data = fetchOutputs(thread_ptr);
This code seems to work, but I want some pause() function that stops when parfeval stops running. I have already tried wait() , but apparentelly wait() also seems to stop the GUI. Any ideas?

Accepted Answer

Edric Ellis
Edric Ellis on 21 Jul 2022
Edited: Edric Ellis on 21 Jul 2022
You should be able to cause the GUI to update by using wait in a loop, together with drawnow. A bit like this:
while ~wait(thread_ptr, 'finished', 0.1) % wait for 0.1 seconds
drawnow % update the UI if the future wasn't finished
A slightly different approach might actually work better here. You can use afterEach with parfeval to automatically run a function when your evaluation on the worker completes. (More details on this page). Something a bit like this
thread_ptr = parfeval(..);
afterEach(thread_ptr, @(result) doStuffWithResult(result), 0)
In this way, doStuffWithResult automatically gets called with the outputs from thread_ptr as soon as they are available.

More Answers (0)


Find more on Asynchronous Parallel Programming in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!