Simulink Desktop Real-time in external mode with S-Function blocks generated using C++ classes and Objects

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vamsi 2015-8-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/233234-simulink-desktop-real-time-in-external-mode-with-s-function-blocks-generated-using-c-classes-and-o

回答： Bing Li 2018-10-17

Hello to every one interested in this question.

I am trying to simulate a model using the Simulink Desktop real-time in external mode, and as mentioned in the title, I have an S-Function block. The mex files that are used by the S-function block are created using C++ source.

As mentioned in the user guide all the memory allocation is done within the mdlStart method. The objects created are made persistent by using the Pwork vector as mentioned in "http://www.mathworks.com/help/simulink/sfg/making-c-objects-persistent.html".

The S-function mex files are created, and the Simulink model is compile without any errors. Now, the Simulink model also runs in the normal mode as expected. But when I tried to connect the Simulink in external mode, the following error occurs: Error loading real-time image: undefined symbol "_ZdlPv".

When I demangled the symbol, I see that this is the operator delete(void*).

(1) Does this mean that the standard library headers are not available for the real-time compiler??

What I tried to do is I have replaced the delete() operator with a custom implementation, but only to realize that the delete() operator is C++ does more than just delete the memory (it also calls the default destructor of the class).

(2) Is C++ code supported at all by the Simulink Desktop real-time?

(3) Do I really have to also code the calls to delete() operator in the mdlTerminate() method??

Thanks for your support.

Vamsi.

PS: I am using Matlab R2015a.