I think it would be better to use parfeval or parfevalOnAll to do this. This way, you can simply cancel the future object returned from those calls to stop the worker execution. You could couple this with a parallel.pool.DataQueue to get the results back from the workers. Here's a simple example:
% Build a really simple "UI" - just a histogram and a button
pool = gcp();
fig = uifigure();
grid = uigridlayout(fig, [1, 2]);
ax = axes(uipanel(grid));
btn = uibutton(grid);
hist = histogram(ax, 'BinEdges', 0.5 + (0:pool.NumWorkers));
% Set up a DataQueue to let the workers send results back to the client
Q = parallel.pool.DataQueue();
% Each time a worker sends a piece of data to the client, append it
% to the histogram
listener = afterEach(Q, @(data) appendData(hist, data));
% Trigger the work on the workers, hook up the future to the button
% so that pressing the button cancels 'fut'.
fut = parfevalOnAll(@doWork, 0, Q);
btn.ButtonPushedFcn = @(~,~) cancel(fut);
%% function to do work on the workers
function doWork(Q)
task = getCurrentTask;
myId = task.ID;
while true
send(Q, myId);
pause(myId/4);
end
end
%% function to append data to the histogram
function appendData(hist, data)
hist.Data(end+1) = data;
end
