mclmcrInitialize fails from C++ Linux call

I have a compiled Matlab model which I compiled using mcc into a shared library.

I call the shared library from C++ code.

This all previously worked under Red Hat 5.5. Now we are on Red Hat 6.9.

Using the same code when I call mclmcrInitialize() from my C++ code I get the following error:

in mclmcrInitialize2_Proxy() from libmwmclmcrrt.so

seg Fault: foundation::msg_svc::threatUtil::CountedMutex::lock() from /sw/MCR/v90/bin/glnxa64/libmwms.so.

Also in the debugger at the time of the crash I see mclAddCanonicalPathMacro_proxy from libmwmclmcrrt.so.

I'm using Matlab 2015b and SDK version 6.1

Thanks.

Answer 1

[Prasad Parameswaran]

On Linux, you get the segmentation fault because you have not allocated memory for the output pointer of pointers. To resolve the crash, you can declare the output variable as a pointer of pointers and then allocate memory, as below:

mxArray **out;

/*This line is necessary when compiled with GCC compiler on Linux*/

out = mxCalloc(1, sizeof(mxArray*));

/*call compiled function*/

mlfToySatDR(1, out, in1);

/*do other stuff*/

/*dispose of pointers properly*/

mxDestroyArray(out[0]);

mxFree(out);