Sorry I wrong to call function vertexAdj[vdata,idata] instead of vertexAdj[v,f]...

Do you mean ?

http://reference.wolfram.com/language/tutorial/SettingUpExternalFunctionsToBeCalledFromTheWolframLanguage.html

that allows a two way exchange over a unix (file/stream) socket called a LiinkObject (which also is used for remote kernels, remote kernels speak the same link language on the socket, per say)

HOWEVER you said memory and that depends. you can copy the data over the link (i'm unsure if your avoiding that so will continue ...)

You could return a unix shared memory location to a mathematica program that can directly read user space memory. if it's CL video card data then that memory is shared.

BETTER: is copy only a filename over the link containing data which is on a memory drive made in shared memory. now your (other side, a notebook) can poke (bytes) of data from the file after opening file without ever the whole file being copied over the link

On a modern system files are cached very well and if used temporarily never are committed to (slow memory or drive), so you really don't need the trouble of insuring file is located on a shared memory drive I think.

In the Unix world there is an old saying: "everything is a file".

Sorry for my English. I did a library with LibraryLink. It's possible avoid every time I startup Mathematica to execute the notebook that compile the dll files and load it to use the imported function?

Thank you very much LibraryUnload resolve. Is it possible to make the dll part of the base Mathematica library?

I have special performance requirements too and large array to import in mathematica. Every time that I call createLibrary mathematica try to create a new dll and when it exist get a boring error CopyFile::filex: Cannot overwrite existing file C:\Users\ale\AppData\Roaming\Mathematica\SystemFiles\LibraryResources\Windows\myLib.dll.

Do you know how solve this problem? To get a new version of dll for every modification I need to close mathematica delete dll files and execute again the command createLibrary this is very boring and time consuming.

Hello, thank you very much for help. I follow your guide and now I am able to compile some c++ code. I tried the CreateMatrix example. Now I would like ask you if it's possibile return a list with different number of elements. I need an array vertex {{1,2,3}, {5,4,6}, {3,4,5}, ...} as input parameters and as output an array like this

{{1,2,3},{2,3,4,5,6,7,8},{3,3}}

It's possibile return a similar array to Mathematica? Mathematica type it as "List".

Ok I check your link and did some test with NetLink and after I executed the example for LibraryLink. In NetLink mmm sound like the output array size should be known because I allocate array before call the function. But if I need an function that return an array size where the size is determinated from the dll function itself it's impraticable.

After I test LibraryLink. with one example and work right. But what's I need is call a DLL that use some c++ code and template. If I tried add a simple class in MyLib.c compiler give me an error. I suppose its set a c compiler. It's possibile use a c++ compiler in LibraryLink that support c++ template? I installed a mingw compiler c++ and set this as default. I use this command to set default compiler.

$CCompiler = {"Compiler" -> 
    CCompilerDriver`MinGWCompiler`MinGWCompiler, 
   "CompilerInstallation" -> "C:\\MinGW32-4.8.2"};

https://reference.wolfram.com/language/NETLink/guide/CallingCOMAndDLLs.html