C-MEX S-Function Simulink Crash

2012 8 30
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Hello,
I generated an S-Function from C++ using the Legacy code to run in simulink. It does not work for all cases: If I change the input parameters or add a new block to run exactly as the existing block I get the message: Your model is still running. Do you want to close it? Yes/No. It does no matter what I choose and the program shuts down either way.
Can someone give me an explanation for that, and give me a hint in what I could do to avoid such behavior please?
I appreciate.

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Kaustubha Govind
Kaustubha Govind 2012-8-30

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Perhaps your C code is causing some memory corruption? You could try debugging your S-function to see which line the crash happens at - this will give you a better idea of what might be going on.

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Daniel
Daniel 2012-8-31
Hi Kaustubha,
Thank you.
If the code was causing memory corruption would not the simulation crashes every time? Or would not even be possible to compile? The fact is the S-function has been compiled and it works but not always.
What does it mean when Matlab pops up a message box with: "The model '' is still running. Do you want to stop and close it? Yes/No"? Clicking Yes or No yields to shutting the program down always.
Additionally C S-Functions do not give the same result as S-Functions from .m files. The plots of .m S-functions are continuous and smooth curves. The C S-Functions, on the other hand, give a "stairway" pattern as if it was discrete. Why do that happen?
Thank you again.
Kaustubha Govind
Kaustubha Govind 2012-9-4
Daniel: No, I've seen that memory corruptions can produce sporadic failures. (Note that they are usually run-time failures that cannot be detected by the compiler)
Your question about your C S-function producing a non-continuous waveform seems like a separate issue. Could you please create a new question for this? You might need to provide snippets of your MATLAB code and your equivalent C code for contributors to provide meaningful feedback.

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