Understanding the Event Triggered by the MATLAB IDE Stop Button During Python Integration

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Andrea
Andrea 2023-12-18
Dear MathWorks Support Team,
I am currently developing a toolbox in MATLAB and, as part of this, I am integrating Python code into my MATLAB environment. The integration process involves calling Python scripts from MATLAB cells. My primary concern revolves around the handling of the "Stop" button (the red square button) in the MATLAB IDE, especially regarding its interaction with the Python scripts being executed.
In an ideal scenario, I wish to implement a feature where, upon pressing the "Stop" button in MATLAB, the Python script in execution would trigger a safe termination process. This process is intended to save the current state or progress of the Python script, ensuring that no data is lost and resources are properly released.
However, I've encountered a challenge: when the "Stop" button is pressed, it's unclear how MATLAB communicates with the Python thread to terminate it. My initial attempt to capture this event involved handling the KeyboardInterrupt exception in Python, akin to capturing a Ctrl+C event in a terminal. Unfortunately, this method did not yield the desired results, indicating that the "Stop" button might not be sending a standard interrupt signal to the Python process.
My questions are as follows:
  1. Could you provide details on the nature of the event or signal sent by MATLAB to a Python script when the "Stop" button is pressed?
  2. Is there a recommended method or best practice for detecting and handling this event within a Python script, to enable a controlled and safe shutdown process?
  3. If the standard interrupt mechanisms do not apply in this context, could you suggest alternative approaches or workarounds to achieve a similar functionality?
Understanding the specifics of this interaction will greatly aid in enhancing the robustness and user-friendliness of the toolbox I am developing. Any insights or guidance you could offer would be immensely appreciated.
Thank you for your time and assistance.
Best regards,

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