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Re: Wolfram LinkLibrary and additional dll on

  • To: mathgroup at smc.vnet.net
  • Subject: [mg122045] Re: Wolfram LinkLibrary and additional dll on
  • From: Patrick Scheibe <pscheibe at trm.uni-leipzig.de>
  • Date: Mon, 10 Oct 2011 05:53:32 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <j6melm$7dj$1@smc.vnet.net> <201110080933.FAA20999@smc.vnet.net>

On Sat, 2011-10-08 at 05:33 -0400, Oleksandr Rasputinov wrote:
> On Fri, 07 Oct 2011 09:53:10 +0100, Patrick Scheibe  
> <pscheibe at trm.uni-leipzig.de> wrote:
> 
> > Hi,
> >
> > I have a package which has its number crunching algorithms in a C++  
> > library which is connected to Mathematica through the LibraryLink.  
> > Inside my algorithms I use the Intel Threading building blocks
> > [1] heavily. I have this library compiled for Linux, Mac OSX and Windows  
> > and inside each LibraryResources directory, I distribute the tbb.{so |  
> > dylib | dll}. Everythings works fine except for 2 Windows machines.
> > On those two machines the Intel compiler tools are not installed and  
> > therefore, my lib has to rely on the
> > tbb.dll which is distributed in the same directory.
> >
> > Loading the package brings up an error dialog, that says that the  
> > tbb.dll could not be found.
> >
> > 1. Using FindLibrary["tbb"] brings up the correct path inside my package.
> >
> > 2. Taking any arbitrarily chosen function from the tbb and register it  
> > with, for instance
> >
> > LibraryFunctionLoad["tbb", "TBB_runtime_interface_version", {}, Integer];
> >
> > and *then* loading my package, works without error.
> >
> > 3. Trying to put this preload inside the WolframLibrary_initialize  
> > function with something like
> >
> > #if defined(_WIN32) || defined(_WIN64)
> > 	tbbLib = LoadLibrary("tbb.dll");
> > 	if(tbbLib != NULL) {
> > 		tbbInitializeFunctionType version = (tbbInitializeFunctionType)  
> > GetProcAddress(tbbLib,
> > 			"TBB_runtime_interface_version");
> > 		char msg[100];
> > 		sprintf(msg,"Die TBB version ist: %d\n",version());
> > 		lib->Message(msg);
> > 	}
> > #endif
> >
> > does not work. Maybe important at this point is, that there is no longer  
> > an "error dialog" coming up. There
> > is now only an Mathematica error message saying, that the library  
> > function could not be loaded. I assume my
> > dll is crashed silently. On the other
> > windows machines with the intel compiler installed everything works fine  
> > and the version number is displayed
> > when the library is loaded first.
> >
> > 4. The dependency walker says that everything is fine with my library.  
> > No wrong modules and the tbb comes from the directory
> > where my library is located
> >
> > 5. Trying to profile math.exe with the dependency walker and loading my  
> > package does not bring any useful information.
> > In fact, I don't see any dlopen or whatsoever when I load my package.  
> > This *suggests* that the tbb is not found in the first
> > place, but this is only a guess and I don't understand this.
> >
> >
> > I'm not a Windows guy and I'm not a soldier in the dll-hell, so can  
> > someone please give me a helping hand here or point me to
> > some useful documentation? Do I maybe need to create a special manifest  
> > file? Does it make a difference whether a
> > dll is not loaded by Mathematica directly, but through another dll?
> >
> > Currently I'm out of ideas how to track this down.
> >
> > Cheers
> > Patrick
> >
> > [1] http://software.intel.com/en-us/articles/intel-tbb/
> 
> The issue may be that LoadLibrary("tbb.dll") fails due to not locating  
> tbb.dll on the search path--note that Windows's search path and  
> Mathematica's $LibraryPath are in general very different (for example, on  
> my system they contain nothing in common). If this is the case, then as I  
> see it you have at least three options:
> 
> 1. set the Windows search path to $LibraryPath using SetDllDirectory()  
> before calling LoadLibrary() (here I assume that you would rather not  
> hard-code a fully qualified path due to possible difference between  
> installations);
> 2. load the library using LoadLibrary(), but giving a fully qualified path  
> to the file as found by FindLibrary[];
> 3. use LoadLibrary["tbb.dll"] as part of your package initialization to  
> have Mathematica do this for you before you load your own library.
> 
> Of these, option 3 seems preferable to me. Actually, I'm surprised that  
> LibraryFunctionLoad worked on tbb.dll considering that this will not  
> contain any WolframLibrary_initialize function or indeed adhere to the  
> Wolfram Library specification in any other respect.
> 


Hi Oleksandr,

thanks for your mail. The problem was, that the dumb thing behind the
keyboard (aka me) was unable to recheck the documentation.
I read it once and thought I had grasped the importand details. Fail.
The LinkLibrary tutorial cries it out loudly here

LibraryLink/tutorial/InteractionWithMathematica#162865056

and confirms, that you were right. The problem were the different paths.
The hack, which a friend suggested, namly to preload the tbb.dll with a
first call to LibraryLoad *is* an actual solution.

Quote: "An alternative is to use LibraryLoad to load the dependent
libraries before loading your own library. LibraryLoad does not return a
function (unlike LibraryFunctionLoad), it merely exists to load
dependent libraries."

Thank you very much for your help.

Cheers
Patrick




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