MATLAB: Is it possible to call a matlab generated shared library multiple times in a program

shared library

When I use the recommended method

      mclRunMain((mclMainFcnType)run_main, 0, NULL);

it always exits the program immediately. So how can i set this up to call the shared library function several times without exiting?

Best Answer

It is my understanding that you would like to call MATLAB generated C/C++ shared library function multiple times in your program. You can call the library function multiple times in the same run_main() function. However, you cannot call run_main() multiple times when using Cocoa on the Macintosh, because when the function pointed to by run_main() returns, the MATLAB Runtime calls exit before the return value can be received by the application, due to the inability of the underlying code to get control when Cocoa is shut down. Refer this example for calling a shared library here

Related Solutions

MATLAB: What is the difference between functions like mclmcrInitialize and mclInitializeApplication

mclmcrInitialize and mclInitializeApplication are MATLAB Compiler Runtime (MCR) functions which are typically used in driver applications for shared libraries.

mclInitializeApplication: This function should be called once at the beginning of your driver application. You must make this call before calling any other MathWorks functions.

mclmcrInitialize: Loads three main libraries (libmex,libmat.libmclmcr) and sets runtime environment for running MATLAB functions.

If the driver application has a main() method, you need to use mclInitializeApplication in the main() method. This in turn calls mclmcrInitialize to load all the libraries.

For example, refer to the following C shared library example:

https://in.mathworks.com/help/compiler_sdk/cxx/c-shared-library-target.html?s_tid=srchtitle

If the driver application has a main() as well as an additional method which uses the mclRunMain function, you must first call mclmcrInitialize. Then inside the function called from mclRunMain, you can call mclInitializeApplication to complete the MCR initialization procedure. mclRunMain is an additional MCR function which handles platform specific threading issues.

For example, refer to the following C++ shared library example:

https://in.mathworks.com/help/compiler_sdk/cxx/c-shared-library-target-1.html?s_tid=srchtitle

In this example, run_main() is the additional method which is called by the mclRunMain function.

MATLAB: Any examples of using mclRunMain with argc and argv populated

I understand that you want an example of 'mclRunMain' with 'argc' and 'argv' arguments. I assume that you are trying to use MATLAB Compiler generated C++ shared library in your program. Please find attached an example where I have implemented simple string concatenation function which accept 2 strings from command line and prints concatenated string. The MATLAB function I had used to created the library is following:

function out = concatString(input1,input2)
  out =  strcat(input1,input2);
end

I have attached the C++ code I have used to call the library here.

Please refer the following link to see how to integrated C++ shared library in your code: https://www.mathworks.com/help/compiler_sdk/cxx/integrate-a-cc-shared-library-into-an-application.html

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MATLAB: What is the difference between functions like mclmcrInitialize and mclInitial​izeApplica​tion

MATLAB: Any examples of using mclRunMain with argc and argv populated

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MATLAB: What is the difference between functions like mclmcrInitialize and mclInitializeApplication