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kill an external process (simulation ) if it is taking too long

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Sajid Afaque
Sajid Afaque on 16 Dec 2019
Commented: Sajid Afaque on 19 Dec 2019
Hey everyone,
even i am using the same stratergy ( https://in.mathworks.com/matlabcentral/answers/300633-external-program-run-kill-from-matlab ) to call an external function and pause for several minutes then kill the process.
it is fine when my external process get into some infinite numerical calculations or it gets strucks.
but my problem is it waits for "n" amount of time even for process that finishes early that n.
can any1 suggest any approach where it waits and kills only when the process gets struck.
it should not wait for the good ones.
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Answers (2)

Guillaume
Guillaume on 18 Dec 2019
You could use a timer for this, it would be something like:
killtimer = timer('ExecutionMode', 'singleshot', 'StartDelay', 5, 'TimerFcn', @killtask); %executes after 5 seconds
yourcodetostartyourprogram
start(killtimer); %start the timer
%...rest of your code as usual
and a seperate function
function killtask(~, ~)
try %wrap in a try catch so that if the program is already terminated we don't throw an error
yourkillcode
end
end
  3 Comments
Sajid Afaque
Sajid Afaque on 19 Dec 2019
sorry for that Guillaume , but its a training for new guys like us.
we will get more exposed to the concepts.
w.r.t above loop, I tried even that,but one problem which i found when using that code was
1)imagine a condition ,where my external process is running and by mistake or due to some reason that tab(external process) get cancelled.in that case if above loop is implemented , i have to re-run the entire code
2)but when "while 1" loop is implemented,even if it get cancelled it will re-run ,but again here i face the initial problem(
)

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Walter Roberson
Walter Roberson on 18 Dec 2019
If you are using MS Windows then you can use .NET as described in https://www.mathworks.com/matlabcentral/answers/418173-run-programm-in-background-without-using-start#answer_335999 . You could loop checking the status at short interals.
If I recall correctly, I have read that you can create callbacks for .NET code; if that is correct, then perhaps it would be possible to create a callback when the process finishes normally; you could use that together with a timer() so as to kill the process if it runs too long.
  5 Comments
Walter Roberson
Walter Roberson on 19 Dec 2019
See the link I already posted as it shows creating the process.
I do not have a Windows MATLAB installed to test with so I cannot write complete code myself.

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